JP5067211B2 - Uninterruptible power supply parallel system and uninterruptible power supply - Google Patents

Description

  The present invention relates to an uninterruptible power supply parallel system configured such that a plurality of uninterruptible power supplies can be connected to a common load-side bus, and to the uninterruptible power supply constituting the system, and more particularly to each uninterruptible power supply. The present invention relates to an uninterruptible power supply parallel system and an uninterruptible power supply apparatus each having an output voltage adjustment function for adjusting an output voltage value of the own apparatus to a target value that can be set from outside.

In an uninterruptible power supply parallel system configured so that multiple uninterruptible power supply units can be connected to a common load bus, serial communication between the uninterruptible power supply units is conventionally performed when changing the output voltage value. And a method of transferring data related to control for voltage adjustment has been adopted.
However, in such a conventional method, it is difficult to change the output voltage at the same time in a plurality of uninterruptible power supply devices at the same time, and this corresponds to a shift in the change timing in each uninterruptible power supply device. It has been an unavoidable problem that a so-called cross current in which current flows between devices due to an imbalance of output voltage values occurs.

In addition, each uninterruptible power supply is managed in a subordinate relationship such as master and slave, and is restricted by a command system in one direction from the upper level device to the lower level device. There is a restriction that the output voltage of the device cannot be changed while synchronizing.
On the other hand, there is a fear of going against the simplification of the signal system, such as requiring a special synchronization signal to align the timing of changing the output voltage among the plurality of uninterruptible power supplies, and reducing the number of signal conductors There are also problems such as obstruction.

In addition, when adjusting the output voltage in a UPS (Uninterruptible Power Supply) parallel system, it has to deal with the conventional problem of having to adjust each UPS little by little alternately and is time-consuming. There have already been proposals to make it easy to adjust (see, for example, Patent Document 1).
In this proposal, any one of all the uninterruptible power supply devices connected in parallel is provided with an operation means, and a change operation for raising and lowering the output voltage of all the uninterruptible power supply devices can be performed from this operation means. When the operation is performed, a voltage operation signal is supplied to all the uninterruptible power supply devices connected in parallel.

The output voltage of the own device rises or falls in synchronization with the rise or fall of the output voltage of the other device. Therefore, since the output voltage of all the uninterruptible power supply units (UPS) connected in parallel can be adjusted to increase or decrease in a synchronized state, and only one operation means is provided, the above operation can be performed with a single operation. It is said that the output voltage can be adjusted.
JP 2005-269720 A

However, in the technique described in Patent Document 1, the operation means for performing the changing operation for raising and lowering the output voltage is provided corresponding to any one of all the uninterruptible power supply devices connected in parallel. Yes.
For this reason, the change operation which raises / lowers the output voltage from any one uninterruptible power supply cannot be performed.
Although it is conceivable to provide an operation means for performing a change operation for raising and lowering the output voltage to all uninterruptible power supply devices, if a configuration such as simply providing such an operation means to all uninterruptible power supply devices, When the number of uninterruptible power supply units (UPS) connected in parallel is large, an increase in the number of signal lines for achieving synchronization related to the change of the output voltage is inevitable.

  The present invention has been made in view of such problems, and a plurality of uninterruptible power supplies each having an output voltage adjustment function for adjusting the output voltage value of its own device to a target value that can be set from the outside. In the uninterruptible power supply parallel system configured so that the power supply units can be connected to a common load-side bus, no dedicated signal is used to synchronize the change of the output voltage between the plurality of uninterruptible power supply units An object of the present invention is to provide an uninterruptible power supply parallel system of this type capable of reducing the number of signal lines for synchronization by applying a synchronization method, and an uninterruptible power supply constituting the system.

In order to solve the above-described problems, the present application proposes the following techniques.
The uninterruptible power supply parallel system according to claim 1 of the present invention is:
A plurality of uninterruptible power supply units each having an output voltage adjustment function for adjusting the output voltage value so that the output voltage value of the device matches the target value that can be set from the outside are connected in parallel to a common load-side bus. Uninterruptible power supply parallel system,
Each of the plurality of uninterruptible power supply devices includes a signal output unit that individually outputs a target value increase designation signal, a target value decrease designation signal, and an increase / decrease amount designation signal to other uninterruptible power supply devices, and a self signal output unit. The output target value increase designation signal, the target value decrease designation signal, and the increase / decrease amount designation signal, and the target value increase designation signal, the target value decrease designation signal, and the increase / decrease amount output from another uninterruptible power supply. A signal input unit to which an individual logical sum signal with a designation signal is input, and the target value increase designation signal, the target value decrease designation signal and the increase / decrease amount designation signal output from the signal output unit, and the signal input unit Target value matching means for performing target value matching with other uninterruptible power supply units based on the target value increase designation signal, the target value decrease designation signal, and the increase / decrease amount designation signal. thing And features.

In the uninterruptible power supply parallel system according to claim 1, a plurality of uninterruptible power supplies each having an output voltage adjustment function for adjusting the output voltage value so that the output voltage value of the own apparatus matches a target value that can be set from the outside. A power supply device is configured to be connected in parallel to a common load-side bus.
Each uninterruptible power supply of this uninterruptible power supply parallel system individually outputs a target value increase designation signal, target value decrease designation signal, and increase / decrease amount designation signal to the other uninterruptible power supply from its own signal output unit To do.

Further, in the signal input unit of the own device, from the target value increase designation signal, the target value decrease designation signal and the increase / decrease amount designation signal output from the signal output unit, and other uninterruptible power supply devices corresponding to the own device An individual OR signal of the output target value increase designation signal, the target value decrease designation signal, and the increase / decrease amount designation signal is received.
Further, the target value matching means of the device itself increases the target value input to the signal input unit and the target value increase designation signal output from the signal output unit, the target value decrease designation signal and the increase / decrease amount designation signal. Based on the designation signal, the target value decrease designation signal, and the increase / decrease amount designation signal, target value matching is performed with another uninterruptible power supply.

The uninterruptible power supply parallel system according to claim 2 of the present invention is:
Particularly in the uninterruptible power supply parallel system according to claim 1, each of the plurality of uninterruptible power supplies includes a target value setting operation unit for setting the target value, and the target value matching unit includes the target value setting unit. When the increase / decrease amount of the target value is set by the operation unit, one of the target value increase designation signal and the target value decrease designation signal is formed corresponding to the setting and output to the signal output unit, When the other designation signal is input from the uninterruptible power supply to the signal input unit, the increase / decrease amount designation signal is formed and output to the signal output unit, and the formed increase / decrease amount designation signal and the signal input unit are input. And an increase / decrease amount transmission means for determining completion of increase / decrease amount transmission by comparing with an increase / decrease designation signal to be performed, and changing the target value based on the increase / decrease amount when the increase / decrease amount transmission is completed. To do.

In the uninterruptible power supply parallel system according to the second aspect, each of the plurality of uninterruptible power supply apparatuses includes a target value setting operation unit that sets the target value, and the target value matching unit includes an increase / decrease amount transmission unit. Yes.
When the increase / decrease amount of the target value is set by the target value setting operation unit by the increase / decrease amount transmission means, one of the target value increase designation signal and the target value decrease designation signal is formed corresponding to the setting. When the other designation signal is input from the other uninterruptible power supply to the signal input section, the increase / decrease amount designation signal is formed and output to the signal output section.
Further, when the increase / decrease amount transmission means completes the increase / decrease amount transmission by comparing the increase / decrease amount designation signal formed as described above with the increase / decrease designation signal input to the signal input unit. The target value is changed based on the increase / decrease amount.

The uninterruptible power supply parallel system according to claim 3 of the present invention is:
In the uninterruptible power supply parallel system according to claim 1 or 2, particularly, the target value matching means in each of the plurality of uninterruptible power supply apparatuses is supplied from the increase / decrease amount transmission means of other uninterruptible power supply apparatuses to a signal input unit. When one of the target value increase designation signal and the target value decrease designation signal representing transmission of the increase / decrease amount is inputted, the target value increase designation signal inputted after responding using the other designation signal, and the The increase / decrease amount is changed based on one of the target value decrease designation signals, the increase / decrease amount designation signal based on the changed increase / decrease amount is output to the signal output unit, and is input to the output increase / decrease amount designation signal and the signal input unit. And an increase / decrease amount changing means for changing a target value based on the changed increase / decrease amount when the increase / decrease amount designation signals match.

In the uninterruptible power supply parallel system according to the third aspect, the target value matching means in each of the plurality of uninterruptible power supply apparatuses includes an increase / decrease amount changing means.
When one of the target value increase designation signal and the target value decrease designation signal representing the transmission of the increase / decrease amount is input from the increase / decrease amount transmission means of the other uninterruptible power supply to the signal input unit by the increase / decrease amount change means. The increase / decrease amount is changed based on one of the target value increase designation signal and the target value decrease designation signal input after responding using the other designation signal, and the increase / decrease designation based on the changed increase / decrease amount A signal is output to the signal output unit, and when the output increase / decrease amount designation signal matches the increase / decrease amount designation signal input from the signal input unit, the target value is changed based on the changed increase / decrease amount.

The uninterruptible power supply according to claim 4 of the present invention is:
A plurality of uninterruptible power supply units each having an output voltage adjustment function for adjusting the output voltage value so that the output voltage value of the device matches the target value that can be set from the outside are connected in parallel to a common load-side bus. An uninterruptible power supply that can constitute an uninterruptible power supply parallel system,
A signal output unit that individually outputs a target value increase designation signal, a target value decrease designation signal, and an increase / decrease amount designation signal to another uninterruptible power supply, the target value increase designation signal output from its own signal output unit, and the target An individual OR signal of the value decrease designation signal and the increase / decrease amount designation signal and the target value increase designation signal, the target value decrease designation signal and the increase / decrease amount designation signal output from another uninterruptible power supply is input. Signal input unit, the target value increase designation signal output from the signal output unit, the target value decrease designation signal, the increase / decrease amount designation signal, the target value increase designation signal input to the signal input unit, and the target And a target value matching means for performing target value matching with another uninterruptible power supply based on the value decrease designation signal and the increase / decrease amount designation signal.

In the uninterruptible power supply of claim 4, the target value increase designation signal, the target value decrease designation signal, and the increase / decrease amount designation signal are individually output to the other uninterruptible power supply apparatus from the signal output unit of the own apparatus.
Further, in the signal input unit of the own device, from the target value increase designation signal, the target value decrease designation signal and the increase / decrease amount designation signal output from the signal output unit, and other uninterruptible power supply devices corresponding to the own device An individual OR signal of the output target value increase designation signal, the target value decrease designation signal, and the increase / decrease amount designation signal is received.
Further, the target value matching means of the device itself increases the target value input to the signal input unit and the target value increase designation signal output from the signal output unit, the target value decrease designation signal and the increase / decrease amount designation signal. Based on the designation signal, the target value decrease designation signal, and the increase / decrease amount designation signal, target value matching is performed with another uninterruptible power supply.

The uninterruptible power supply according to claim 5 of the present invention is:
5. The uninterruptible power supply according to claim 4, further comprising a target value setting operation unit for setting the target value, wherein the target value matching means is configured to set an increase / decrease amount of the target value in the target value setting operation unit. Sometimes, corresponding to the setting, one of the target value increase designation signal and the target value decrease designation signal is formed and output to the signal output unit, and the other designation signal is input from the other uninterruptible power supply When the signal is input to the unit, the increase / decrease amount designation signal is formed and output to the signal output unit, and the formed increase / decrease amount designation signal is compared with the increase / decrease designation signal input to the signal input unit. An increase / decrease transmission means for determining completion of transmission and changing the target value based on the increase / decrease when the transmission of the increase / decrease is completed is provided.

The uninterruptible power supply according to claim 5 includes a target value setting operation unit for setting the target value, and the target value matching means includes an increase / decrease amount transmission means.
When the increase / decrease amount of the target value is set by the target value setting operation unit by the increase / decrease amount transmission means, one of the target value increase designation signal and the target value decrease designation signal is formed corresponding to the setting. When the other designation signal is input from the other uninterruptible power supply to the signal input section, the increase / decrease amount designation signal is formed and output to the signal output section.
Further, when the increase / decrease amount transmission means completes the increase / decrease amount transmission by comparing the increase / decrease amount designation signal formed as described above with the increase / decrease designation signal input to the signal input unit. The target value is changed based on the increase / decrease amount.

The uninterruptible power supply according to claim 6 of the present invention is:
6. The uninterruptible power supply according to claim 4 or 5, wherein the target value matching means is a target value increase designation indicating transmission of an increase / decrease amount from the increase / decrease amount transmission means of another uninterruptible power supply to a signal input unit. When one of the signal and the target value decrease designating signal is input, it increases or decreases based on one of the target value increase designating signal and the target value decrease designating signal input after responding using the other designating signal When the amount is changed, the increase / decrease amount designation signal based on the changed increase / decrease amount is output to the signal output unit, and when the output increase / decrease amount designation signal matches the increase / decrease amount designation signal input in the signal input unit, An increase / decrease amount changing means for changing the target value based on the changed increase / decrease amount is provided.

In the uninterruptible power supply according to the sixth aspect, the target value matching means includes an increase / decrease amount changing means.
When one of the target value increase designation signal and the target value decrease designation signal representing the transmission of the increase / decrease amount is input from the increase / decrease amount transmission means of the other uninterruptible power supply to the signal input unit by the increase / decrease amount change means. The increase / decrease amount is changed based on one of the target value increase designation signal and the target value decrease designation signal input after responding using the other designation signal, and the increase / decrease designation based on the changed increase / decrease amount A signal is output to the signal output unit, and when the output increase / decrease amount designation signal matches the increase / decrease amount designation signal input from the signal input unit, the target value is changed based on the changed increase / decrease amount.

The uninterruptible power supply parallel system according to claim 7 of the present invention is:
A plurality of uninterruptible power supply units each having an output voltage adjustment function for adjusting the output voltage value so that the output voltage value of the device matches an externally set target value are connected to a common load-side bus. An uninterruptible power supply parallel system configured to obtain,
Each of the plurality of uninterruptible power supplies includes a target value setting operation unit provided corresponding to the own device for setting the target value, and a target value set by an operation on the target value setting operation unit. Target value transmission means for transmitting to each other uninterruptible power supply of the uninterruptible power supply parallel system, and the target value transmission means changes the target value to a value higher or lower than the current value. An output unit that outputs both a change direction designation signal that indicates whether to change and a change width defining signal that represents the degree of the change, the change direction designation signal output from the output unit of the device itself, and the change direction designation An input signal of a logical sum with a response signal issued from each other uninterruptible power supply in response to the signal, the change width defining signal output from the output unit of the own apparatus, and a signal issued from each other uninterruptible power supply With the change width regulation signal An input unit that receives an input signal of both logical inputs of the logical sum input signal and the change direction designation signal output from the output unit in any one of the other uninterruptible power supply devices is received by the input unit of the own device In response to this, the change direction designation signal corresponding to the change direction different from the change direction represented by the received change direction designation signal is transmitted from the output unit of the own apparatus through the change direction designation signal conductor. The change received from the output unit of the own device in response to receiving the change width defining signal output from the output unit of any of the other uninterruptible power supply devices at the input unit of the own device Response control means for performing response control so as to transmit the change width defining signal representing the change width represented by the width defining signal, and an input signal of the logical sum input to the input unit is the output of the device. And a target value changing means for changing the target value in the own device to a value corresponding to the change width specified by the change width specifying signal at a timing coincident with the value of the change width specifying signal issued from the section. It is characterized by being.

The uninterruptible power supply parallel system according to claim 7 has a plurality of output voltage adjustment functions for adjusting the output voltage value so that the output voltage value of the device matches the target value that can be set from the outside. The uninterruptible power supply apparatus is connected to a common load side bus, and is configured to be able to supply power to each load side bus.
Each uninterruptible power supply of this uninterruptible power supply parallel system has a target value setting operation unit for setting the target value corresponding to its own device, and by operation on this target value setting operation unit The set target value is transmitted to each other uninterruptible power supply of the uninterruptible power supply parallel system by target value transmission means.

Each of these target value transmission means indicates whether the target value is changed to a value higher or lower than the current value by the change direction designation signal, and indicates the degree of the change by the change width defining signal. Thus, both these signals are output from the output unit.
Further, an input signal of a logical sum of the change direction designation signal output from the output unit of the own device and a response signal issued from each other uninterruptible power supply in response to the change direction designation signal, The input unit receives an input signal of both logical sums of the input signals of the logical sum of the change width defining signal output from the output unit and the change width defining signal issued from each other uninterruptible power supply.

In particular, the output of the own device in response to receiving the change direction designation signal output from the output unit in any of the other uninterruptible power supply devices at the input unit of the own device by response control means The change direction designation signal corresponding to a change direction different from the change direction represented by the received change direction designation signal from the unit is transmitted through the change direction designation signal conductor, and further in any of the other uninterruptible power supply devices In response to receiving the change width defining signal output from the output section at the input section of the own apparatus, the change width expressed by the received change width defining signal from the output section of the own apparatus is represented. Response control is performed so as to transmit the change width defining signal.
Further, the target value is changed by the target value changing means at the timing when the input signal of the logical sum input to the input unit coincides with the value of the change width defining signal issued from the output unit of the own device. The value is changed to a value corresponding to the change width specified by the change width specifying signal.

The uninterruptible power supply according to claim 8 of the present invention is:
It has an output voltage adjustment function for adjusting the output voltage value so that the output voltage value of the device matches a target value that can be set from the outside, and has an output voltage adjustment function similar to the output voltage adjustment function An uninterruptible power supply that can be connected to a common load-side bus with other uninterruptible power supplies to form an uninterruptible power supply parallel system,
A target value setting operation unit provided for setting the target value; and target value transmission means for transmitting a target value set by an operation on the target value setting operation unit to the other uninterruptible power supply. The target value transmission means includes both a change direction designation signal indicating whether the target value is changed to a value higher or lower than the current value, and a change width defining signal indicating the degree of the change. A logical sum input signal of the change direction designation signal output from the output section and the response signal issued from the other uninterruptible power supply in response to the change direction designation signal; An input unit that receives an input signal of both logical inputs of a logical sum input signal of a change width regulation signal output from the output unit of the device and a change width regulation signal emitted from the other uninterruptible power supply device; To any uninterruptible power supply The change direction designation signal output from the output unit is different from the change direction represented by the received change direction designation signal from the output unit of the own device in response to receiving the change direction designation signal from the output unit of the own device. The change direction specifying signal corresponding to the change direction is transmitted through the change direction specifying signal conductor, and the change width defining signal output from the output unit in any one of the other uninterruptible power supply devices is used as the change width specifying signal of the own device. Response control means for performing response control so as to transmit the change width defining signal representing the change width represented by the received change width defining signal from the output unit of the own device in response to being received by the input unit; At the timing when the input signal of the logical sum input to the input unit coincides with the value of the change width defining signal issued from the output unit of the own device, the target value in the own device is changed. Characterized in that it comprises a target value changing means for changing a value corresponding to the change width defined by the width defining signal, a.

The uninterruptible power supply according to claim 8 has an output voltage adjustment function for adjusting the output voltage value so that the output voltage value of the device matches a target value that can be set from the outside. An uninterruptible power supply parallel system can be configured by being connected to a common load-side bus with other uninterruptible power supplies having an output voltage adjustment function similar to the adjustment function.
Each uninterruptible power supply device includes a target value setting operation unit and a target value transmission unit, and the target value is set by the target value setting operation unit corresponding to the own device.
Moreover, the target value set by the operation on the target value setting operation unit is transmitted to each other uninterruptible power supply of the uninterruptible power supply parallel system by the target value transmitting means.
The target value transmission means indicates whether the target value is changed to a value higher or lower than the current value by the change direction designation signal, and represents the degree of the change by the change width defining signal. In addition, both signals are output from the output unit.

  Further, an input signal of a logical sum of the change direction designation signal output from the output unit of the own device and a response signal issued from each other uninterruptible power supply in response to the change direction designation signal, The input unit receives an input signal of both logical sums of the input signals of the logical sum of the change width defining signal output from the output unit and the change width defining signal issued from each other uninterruptible power supply.

In particular, the output of the own device in response to receiving the change direction designation signal output from the output unit in any of the other uninterruptible power supply devices at the input unit of the own device by response control means The change direction designation signal corresponding to a change direction different from the change direction represented by the received change direction designation signal from the unit is transmitted through the change direction designation signal conductor, and further in any of the other uninterruptible power supply devices In response to receiving the change width defining signal output from the output section at the input section of the own apparatus, the change width expressed by the received change width defining signal from the output section of the own apparatus is represented. Response control is performed so as to transmit the change width defining signal.
Further, at the timing when the input signal of the logical sum input to the input unit coincides with the value of the change width defining signal issued from the output unit of the own device, the target value in the own device is set by the target value changing means. The value is changed to a value corresponding to the change width specified by the change width specifying signal.

The uninterruptible power supply according to claim 9 of the present invention is:
In the uninterruptible power supply according to claim 8, in particular, the output unit of the target value transmission means includes a conductor for a change direction designation signal indicating that the target value is changed to a value higher than a current value, and the target value. A pair of change direction designation signal conductors, which represents a change to a value lower than the current value, and 1 for representing the change width defining signal as a 2-bit binary signal. It has two pairs of conductors, a pair of change width defining signal conductors.

  In the uninterruptible power supply according to claim 9, the change direction designation signal conductor representing changing the target value to a value higher than the current value and changing the target value to a value lower than the current value. 2 of a pair of change direction specifying signal conductors with a change direction specifying signal conductor to be expressed, and a pair of change width specifying signal conductors for expressing the change width specifying signal as a 2-bit binary signal. A pair of conductors can serve to output each signal in the output unit of the target value transmission means.

The uninterruptible power supply according to claim 10 of the present invention is:
In the uninterruptible power supply apparatus according to claim 8, in particular, the input unit of the target value transmission means responds to the change direction designation signal output from the output unit and the other direction of the uninterruptible power supply in response to the change direction designation signal. A pair of conductors for a first input signal that represents an input signal of a logical sum with a response signal emitted from the device by one bit for each change direction, and a change width defining signal output from the output unit of the own device And a pair of conductors for a second input signal that represents an input signal of a logical sum of a change width defining signal generated from the other uninterruptible power supply device as a 2-bit binary signal It is characterized by having.

  In the uninterruptible power supply according to claim 10, an input of a logical sum of the change direction designation signal output from the output unit and a response signal issued from the other uninterruptible power supply in response to the change direction designation signal A pair of conductors for a first input signal that represents a signal with one bit for each change direction, a change width defining signal output from the output unit of the own device, and a change issued from the other uninterruptible power supply Each signal at the input section of the target value transmission means with two pairs of conductors, a pair of conductors for a second input signal that represents an input signal of a logical sum with a width defining signal as a 2-bit binary signal Can be input.

  A plurality of uninterruptible power supply units each having an output voltage adjustment function for adjusting the output voltage value of the device to match a target value that can be set from the outside can be connected to a common load-side bus. In the uninterruptible power supply parallel system, a dedicated signal to synchronize the change of output voltage between multiple uninterruptible power supply units is not used, but it is synchronized with a part of the signal for instructing the rise and fall of the output voltage It is possible to superimpose signals for obtaining the synchronization to establish the synchronization and reduce the number of signal lines for synchronization.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing an uninterruptible power supply parallel system and an uninterruptible power supply constituting the system as an embodiment of the present invention.
In FIG. 1, an uninterruptible power supply parallel system 10 as an embodiment of the present invention includes a plurality of uninterruptible power supply apparatuses (in the present example, a first uninterruptible power supply 100 and a second uninterruptible power supply 100) as an embodiment of the present invention. The power failure power supply device 200) is connected to the common load side bus 30 and configured.
The first uninterruptible power supply apparatus 100 and the second uninterruptible power supply apparatus 200 have similar configurations. Hereinafter, the second uninterruptible power supply will be described in the description of the first uninterruptible power supply apparatus 100 for these configurations. Corresponding items related to the apparatus 200 are written in parentheses as appropriate, and will be described in parallel.

The first uninterruptible power supply 100 (second uninterruptible power supply 200) includes a rectifier 102 (202) between a power receiving side terminal 21 (22) and a load side bus 30 common to both uninterruptible power supplies 100 and 200. And the inverter 103 (203) are connected in a cascade-connected circuit in the order described above to constitute a main body portion as an uninterruptible power supply.
The inverter 103 (203) is provided with a target value input terminal 104 (204) which is a target value data receiving terminal for variably setting the target value of the output voltage value from the outside.
The target value input terminal 104 (204) is supplied with the target value of the output voltage from the system controller 121 (201) as will be described later, and the inverter 103 (203) follows the target value supplied from the outside in this way. Adjust the output voltage of your device.

The inverter 103 (203) having the output voltage adjusting function as described above has a difference between the target value related to the output voltage value supplied to the target value input terminal 104 (204) and the detected value of the output voltage by a predetermined detector. Accordingly, an inverter control unit that generates, for example, a PWM signal for adjusting the output voltage is provided, and a known configuration that adjusts the output voltage according to the output of the inverter control unit is provided.
The first uninterruptible power supply 100 (second uninterruptible power supply 200) further includes a target value setting operation unit 110 (corresponding to the own apparatus 100 (200) for setting a target value of the output voltage value. 210) and the target value set by the operation on the target value setting operation unit 110 (210) is transmitted to each other uninterruptible power supply of the uninterruptible power supply parallel system 10 (in this example, the first uninterruptible power supply) Target value transmission means 120 (220) for transmitting from the device 100 to the second uninterruptible power supply 200; transmitting from the second uninterruptible power supply 200 to the first uninterruptible power supply 100).

  As will be described below, the target value transmission means 120 (220) is composed mainly of a CPU and is a system controller 121 (mainly managing input / output signals such as logic processing and required signal conversion related to input / output signals. 221), a predetermined conductor (hereinafter, appropriately referred to as a signal line) connected to the system controller 121 (221), and a buffer inserted in the signal line.

That is, the target value transmission means 120 (220) includes a change direction designation signal (“UP”; “DOWN”) indicating whether the signal target value is changed to a value higher or lower than the current value, An output unit 122 (222) that outputs both of the change width defining signals (“D0” and “D1”) indicating the degree of change is provided.
Of the change direction designation signal, “UP” is a target value increase designation signal, and “DOWN” is a target value decrease designation signal.
“D0” and “D1” are change width defining signals. From the viewpoint of specifying an amount to increase or decrease the signal target value by this signal based on the operation of the operator, the change width defining signals are: Increase / decrease amount designation signal.
The output unit 122 (222) includes a corresponding functional unit of the system controller 121 (221), a corresponding conductor unit, and the like.

  Further, the target value transmission means 120 (220) responds to the change direction designation signal (“UP”; “DOWN”) output from the output unit 122 (222) of its own apparatus and the other change direction designation signal. Logical OR with response signal issued from uninterruptible power supply (in this example, second uninterruptible power supply 200 for first uninterruptible power supply 100; first uninterruptible power supply 100 for second uninterruptible power supply 200) Input signal, change width defining signals (“D0”, “D1”) output from the output unit 122 (222) of the own device 100 (200), and other uninterruptible power supply devices (in this example, the first Logical sum of change width regulation signals (“D0”, “D1”) issued from the second uninterruptible power supply 200 for the uninterruptible power supply 100; the first uninterruptible power supply 100 for the second uninterruptible power supply 200) Both input signals An input unit 123 for receiving an input signal of the physical sum and a (223).

The input unit 123 (223) is also configured by a corresponding functional unit of the system controller 121 (221), a corresponding conductor unit, and the like.
Particularly in the present embodiment, the system controller 121 (221) also functions as a response control unit that issues a predetermined response signal from the output unit 122 (222) in response to a signal received by the input unit 123 (223).
By the function as the response control means, the change direction designation signal (“UP”; “DOWN”) output from the output unit 122 (222) in any of the other uninterruptible power supply devices viewed from the own device is sent to the own device. The change direction designation signal (corresponding to the change direction different from the change direction represented by the received change direction designation signal from the output unit 122 (222) of the own apparatus in response to the reception by the input unit 123 (223) of "DOWN" for "UP";"UP" for "DOWN") is transmitted through the change direction designation signal conductor.

Furthermore, the change width defining signal ("D0", "D1") output from the output unit 122 (222) in any of the other uninterruptible power supply devices viewed from the self-device by the function as the response control means. In response to the reception of the change width defining signal ("D0") indicating the change width represented by the received change width defining signal from the output section 122 (222) of the own device ”,“ D1 ”).
Furthermore, the target value transmission means 120 (220) is a timing at which the input signal of the logical sum input to the input unit 123 (223) coincides with the value of the change width defining signal already issued from the output unit of its own device. And target value changing means 121 + 124 (221 + 224) for changing the target value in the device 100 (200) to a value corresponding to the change width defined by the change width defining signal (“D0”, “D1”). ing.

This target value changing means 121 + 124 (221 + 224) is also configured by a corresponding functional part of the system controller 121 (221), a corresponding conductor part, and the like.
Reference numeral 124 (224) is a signal line for supplying a target value signal from the system controller 121 (221) to the target value input terminal 104 (204) of the inverter 103 (203).

  The output unit 122 (222) of the target value transmission means 120 (220) of the first uninterruptible power supply 100 (second uninterruptible power supply 200) changes the target value of the output voltage to a value higher than the current value. Change direction designating signal (target value increase designating signal) “UP” conductor 151 (251), and change direction designating signal (target value decrement designating) representing changing the target value to a value lower than the current value Signal) A pair of change direction designation signal conductors 151 and 152 (251 and 252) with a conductor 152 (252) for "DOWN" and a change width defining signal (increase / decrease designation signal) are 2-bit binary signals. It has two pairs of conductors, a pair of change width defining signal conductors 153 and 154 (253 and 254) to be represented by (lower bit D0; upper bit D1).

  On the other hand, the input unit 123 (223) of the target value transmission means 120 (220) of the first uninterruptible power supply 100 (second uninterruptible power supply 200) receives a change direction designation signal (from the output unit 122 (222)). "UP"; "DOWN") and another uninterruptible power supply (in this example, the second uninterruptible power supply 200 for the first uninterruptible power supply 100; second uninterruptible power supply in response to the change direction designation signal A pair of conductors 161 and 162 (261 for a first input signal, which represents an input signal of a logical sum with a response signal generated from the first uninterruptible power supply device 100) for the device 200 by one bit for each change direction 262).

Furthermore, the input unit 123 (223) receives the change width defining signal output from the output unit 122 (222) of the own device 100 (200) and another uninterruptible power supply device (in this example, the first uninterruptible power supply device 100). Second uninterruptible power supply 200; first input signal of logical sum with change width defining signal issued from first uninterruptible power supply 100 to second uninterruptible power supply 200) A 2-bit binary signal (lower bit D0; It has a pair of conductors 163, 164 (263, 264) for the second input signal represented by the upper bits D1).
That is, the input unit 123 (223) includes a pair of conductors 161 and 162 (261 and 262) for the first input signal and a pair of conductors 163 and 164 (263 and 264) for the second input signal. And two pairs of conductors.

  As illustrated, the first uninterruptible power supply 100 and the second uninterruptible power supply 200 have a signal line 301 for a signal “UP” indicating that the target value is changed to a value higher than the current value, A signal line 302 for a signal “DOWN” indicating a change to a value lower than the current value, a signal line 303 for a signal “D0” indicating a lower digit of the change width defining signal indicating the degree of the change, and a change The signal lines 304 for the signal “D1” representing the upper digit of the width defining signal are connected by a conductor including the signal line.

The pair of change direction designating signal (“UP”; “DOWN”) conductors 151 and 152 (251 and 252) described above are paired with a pair of signal lines via the buffers 131 and 132 (231 and 232) in the forward direction. 301 and 302 are connected.
Similarly, the conductors 153 and 154 (253 and 254) for the pair of change width defining signals (lower bit D0; upper bit D1) are forwardly connected to the pair of signal lines 301 via the buffers 133 and 134 (233 and 234). , 302 are connected.
On the other hand, a pair of signal lines 301 and 302 for a pair of change direction designation signals (“UP”; “DOWN”) are for the first input signal via buffers 141 and 142 (241 and 242) in the forward direction. Are connected to a pair of conductors 161, 162 (261, 262).

Similarly, a pair of change width defining signal (lower bit D0; upper bit D1) conductors 153, 154 (253, 254) are forwardly connected to the second input signal via buffers 143, 144 (243, 244). Are connected to a pair of conductors 163, 164 (263, 264).
The above-described buffers 131, 132, 133, and 134 (231, 232, 233, and 234) are of the open collector circuit form in which the collector side of the transistor is connected to the circuit power supply via a pull-up resistor. Can be recommended.
This also applies to the buffers 141, 142, 143, 144 (241, 242, 243, 244).

2 and 3 are signal waveform diagrams showing transitions of the above-described signals in uninterruptible power supply parallel system 10 (first uninterruptible power supply 100 and second uninterruptible power supply 200) of FIG. FIG. 2 shows a case where an operation for increasing the output voltage value is performed on the uninterruptible power supply parallel system 10, and FIG. 3 shows an operation for decreasing the output voltage value for the uninterruptible power supply parallel system 10. Represents the case where is performed.
4 and 5 are flowcharts showing the operation of the uninterruptible power supply parallel system 10 (first uninterruptible power supply 100 and second uninterruptible power supply 200) of FIG.
FIG. 4 is a flowchart showing the operation of the uninterruptible power supply when an operation is performed on the target value setting operation unit of the own device, and FIG. 5 is an operation performed on the target value setting operation unit. It is a flowchart showing operation | movement in the uninterruptible power supply device in the case of operate | moving in response to the signal from the other apparatus.

Hereinafter, first, the operation of the uninterruptible power supply parallel system 10 (first uninterruptible power supply 100 and second uninterruptible power supply 200) of FIG. 1 will be described with reference to FIG. 2, FIG. 3, and FIG. .
The uninterruptible power supply parallel system 10 in FIG. 1 has a specification in which the 1% output value is changed according to a single operation related to the change (lifting) of the output voltage value.
In other words, in the uninterruptible power supply parallel system 10 of the present embodiment, the output voltage value is changed with a resolution of 1% in correspondence with one operation, and therefore, for example, the 3% output value is finally changed. In some cases, the output voltage value is changed in accordance with each change operation, waits for 1% to change once and then settles, and then the next change operation is performed three times in total. . The output voltage value can be monitored at any time by a known voltmeter.

In the example described below with reference to FIGS. 2, 3, and 4, the output voltage value of the uninterruptible power supply parallel system 10 with respect to the target value setting operation unit 110 of the first uninterruptible power supply 100. A description will be given assuming that the change operation is performed.
In the time interval T1 in FIG. 2, the pair of change direction designation signals (“UP”; “DOWN”) described above are both “0”, and it is monitored that the change operation of the target value is performed by the operator. (Step S401 in FIG. 4: No).
As indicated by the time interval T1 in FIG. 2, in this example, in this time interval T1, the pair of change width defining signals [D1D0] has already been changed to [01], that is, an increase of 1% from the initial output value. It is in a state that has been.

When it is recognized from the standby state of the time section T1 that the change operation has been performed (step S401: Yes), it is determined whether the operation is an operation to increase or decrease the output voltage value (step S401). S402).
When it is determined in step S402 that an operation for increasing the output voltage value has been performed (step S402: UP), the change direction designation signal “UP” is set to “1” (step S403). This corresponds to the time interval T2 in FIG.
In this embodiment, a signal corresponding to “1” is output to the above-described conductor 151 on the output side of the system controller 121 in response to an operation in the direction of increasing the output voltage value on the first uninterruptible power supply 100 side. The second uninterruptible power supply is a system of the buffer 131 → the signal line 301 → the buffer 231 on the second uninterruptible power supply 200 side → the conductor 261 on the input side of the system controller 221 described above. It is transmitted to the 200 side.

When the second uninterruptible power supply 200 receives and recognizes the signal “1” on the signal line 301 from the first uninterruptible power supply 100 as described above, the second uninterruptible power supply 200 receives the signal “1”. As a signal indicating that it has been recognized, a response is made by issuing a signal in a form in which “DOWN” which is contrary to “UP” is set to “1”.
The signal “1” in this response is the conductor 252 already described on the system controller 221 side → the signal line 302 → the buffer 142 on the first uninterruptible power supply 100 side → the conductor 162 already described on the input side of the system controller 221. And transmitted to the first uninterruptible power supply 100 side.

  That is, the first uninterruptible power supply 100 side waits in the time interval T2 of FIG. 2 for the above response to be returned from the second uninterruptible power supply 200 side (step S404: No). When the response “1” is returned and the state becomes the state of the time interval T3 in FIG. 2 (step S404: Yes), the signal corresponding to the value “2” representing the change width of 1% as in the time interval T4 in FIG. (D1, D0 = 1, 0) is output to the signal line 304 and the signal line 303 via the buffer 134 and the buffer 133 (step S405).

In the time interval T4 in FIG. 2, the output from the pair of change width defining signals on the first uninterruptible power supply 100 side is set to (D1, D0 = 1, 0) as described above, but the actual The signal is (D1, D0 = 1, 1).
Since this was initially (D1, D0 = 0, 1) when the target value was to be changed, the uninterruptible power supply devices (in this example, the first uninterruptible power supply units) operated in parallel during the initial transition period. 1 uninterruptible power supply apparatus 100 and second uninterruptible power supply apparatus 200) the output value of the change width defining signal from the output section and the input value to the input section (the logic of this existing output value from the output signal from another apparatus) The change width defining signal is (D1, D0 = 1, 1) during a temporary transition period (time interval T4 in FIG. 2). ).

After the transition period (time interval T4 in FIG. 2) (step S406: No), the signal levels on the signal lines 303 and 304 of D1 and D0 are (D1) as shown in the time interval T5 in FIG. , D0 = 0, 1). That is, the existing output value of the change width defining signal coincides with the current value of the change width defining signal input to the input unit of its own device as a logical sum with the output signal from the other device (step S406: Yes).
In the set state, the signals on the signal lines 304 and 303 of D1 and D0 and the signals output from the output side conductor 154 and the conductor 153 of the system controller 121 via the buffer 134 and the buffer 133 are The corresponding logical sum signal is also set to (D1, D0 = 0, 1) and fed back to the input unit 123 of the system controller 121 via the buffers 144 and 143.

  In the system controller 121, as described above, the logical sum signal (D1, D0 = 0, 1) fed back in the time interval T5 in FIG. 2 corresponds to a value that changes the output voltage value according to the current operation. (D1, D0 = 0, 1), and a signal indicating that the recognition has been reached is represented by a pair of change direction designation signals (as shown in the time section T6 in FIG. As “UP” = 0; “DOWN” = 0), the signal is output to the signal line 301 and the signal line 302 via the buffer 151 and the buffer 152 (step S407).

  As described above, at the timing when a pair of change direction designation signals (“UP” = 0; “DOWN” = 0) is set, the first system controller 121 passes through the target value signal supply signal line 124 and the inverter 103 The target value of the output voltage changed by the above-described operation is supplied to the target value input terminal 104, and in synchronization with this supply, the target value of the inverter 203 is passed from the second system controller 221 through the target value signal supply signal line 224. The target value of the output voltage that is changed by the above operation is supplied to the input terminal 204 (step S408).

As described above, the first uninterruptible power supply device 100 and the second uninterruptible power supply device 200 in the uninterruptible power supply parallel system 10 can output the output voltage without using a separate dedicated conductor for the synchronization signal. The output voltage can be changed in a constantly synchronized state by using a control signal superimposed on a signal conductor for defining a target value.
On the other hand, when it is determined in step S402 in FIG. 4 that the operation in the direction of decreasing the output voltage value has been performed (step S402: DOWN), the change direction designation signal “DOWN” is set to “1” (step S409). This corresponds to the transition from the time interval T7 to the time interval T8 in FIG.

  In this embodiment, a signal corresponding to “1” is output to the above-described conductor 152 on the output side of the system controller 121 in response to an operation in the direction of decreasing the output voltage value on the first uninterruptible power supply 100 side. The second uninterruptible power supply is a system of the buffer 132 → the signal line 302 → the second uninterruptible power supply 200 side buffer 232 → the above-described conductor 262 on the input side of the system controller 221. It is transmitted to the 200 side.

When the second uninterruptible power supply 200 receives and recognizes the signal “1” on the signal line 302 from the first uninterruptible power supply 100 as described above, the second uninterruptible power supply 200 receives the signal “1”. Then, as a signal indicating that it has been recognized, it responds by issuing a signal in a form in which “UP”, which is contrary to “DOWN”, is set to “1”.
The signal “1” in this response is the conductor 251 already described on the system controller 221 side → the signal line 301 → the buffer 141 on the first uninterruptible power supply 100 side → the conductor 161 already described on the input side of the system controller 221. And transmitted to the first uninterruptible power supply 100 side.

  That is, the first uninterruptible power supply 100 side waits for the time interval T8 in FIG. 3 for the above response to be returned from the second uninterruptible power supply 200 side (step S410: No). When the response “1” is returned and the state becomes the state of the time interval T9 of FIG. 2 (step S410: Yes), the signal corresponding to the value “0” representing the change width of 1% as shown in the time interval T10 of FIG. (D1, D0 = 0, 0) is output to the signal line 304 and the signal line 303 via the buffer 134 and the buffer 133 (step S411).

In the time interval T10 in FIG. 3, the output from the pair of change width defining signals on the first uninterruptible power supply 100 side is set to (D1, D0 = 0, 0) as described above. The signal is (D1, D0 = 0, 1).
Since this was initially (D1, D0 = 0, 1) when the target value was to be changed, the uninterruptible power supply devices (in this example, the first uninterruptible power supply units) operated in parallel during the initial transition period. The change width defining signals of the 1 uninterruptible power supply apparatus 100 and the second uninterruptible power supply apparatus 200 are not consistent, and the change width defining signals are (D1, D0) during a temporary transition period (time interval T10 in FIG. 3). = 0 and 1).

  After the transition period (time interval T10 of FIG. 3) as described above (step S412: No), the signal levels on the signal lines 304 and 303 of D1 and D0 are (D1) as shown in the time interval T11 of FIG. , D0 = 0, 0). That is, as in step S406 described above, the output value of the change width defining signal matches the current value of the change width defining signal input to the input unit of the own device as a logical sum with the output signal from the other device. (Step S412: Yes).

  In the set state, the signals on the signal lines 304 and 303 of D1 and D0 and the signals output from the output side conductor 154 and the conductor 153 of the system controller 121 via the buffer 134 and the buffer 133 are The corresponding logical sum signal is also set to (D1, D0 = 0, 1) and fed back to the input unit 123 of the system controller 121 via the buffers 144 and 143.

  In the system controller 121, as described above, the logical sum signal (D1, D0 = 0, 0) fed back in the time interval T11 in FIG. 3 corresponds to a value that changes the output voltage value according to the current operation. (D1, D0 = 0, 0), and a signal indicating that this recognition has been reached, as indicated by the time interval T12 in FIG. As “UP” = 0; “DOWN” = 0), the signal is output to the signal line 301 and the signal line 302 via the buffer 151 and the buffer 152 (step S413).

  As described above, at the timing when a pair of change direction designation signals (“UP” = 0; “DOWN” = 0) is set, the first system controller 121 passes through the target value signal supply signal line 124 and the inverter 103 The target value of the output voltage changed by the above-described operation is supplied to the target value input terminal 104, and in synchronization with this supply, the target value of the inverter 203 is passed from the second system controller 221 through the target value signal supply signal line 224. The target value of the output voltage changed by the above operation is supplied to the input terminal 204 (step S414).

As described above, the first uninterruptible power supply device 100 and the second uninterruptible power supply device 200 in the uninterruptible power supply parallel system 10 can output the output voltage without using a separate dedicated conductor for the synchronization signal. The output voltage can be changed in a constantly synchronized state by using a control signal superimposed on a signal conductor for defining a target value.
On the other hand, FIG. 5 is a flowchart showing the operation of the uninterruptible power supply device when operating in response to a signal from another device in which the target value setting operation unit is operated. And essentially the same as described above with reference to FIG.

Therefore, in the flowchart of FIG. 5, the step numbers of the 500th series are attached instead of the step numbers of the 400th series in FIG. 4, and differences from the case of FIG. 4 will be briefly described.
That is, in step S501, the arrival of a signal (change direction designation signal) due to a target value changing operation from another device operated on the target value setting operation unit is monitored (step S501: No), and the signal is When it arrives (step S501: Yes), it is determined whether the operation represented by the signal is an operation for increasing or decreasing the output voltage value (step S502).

When an operation to increase the output voltage value is performed in step S502, that is, when a signal with “UP” of “1” and “DOWN” of 0 arrives from another device (step S402: UP), When it is recognized as a device, an output signal with a change direction designation signal “UP” of “0” and “DOWN” of 1 is issued from the output unit (step S503).
This step S503, which is a step S403 in which a signal of “UP” is “1” and “DOWN” is 0, is a position of whether to change the target value by itself or passively follow another device. The difference is due to the difference.

Hereinafter, Step S504 to Step S508 are the same as Step S404 to Step S408 in FIG.
When the operation in the direction of decreasing the output voltage value is performed in step S502, that is, when a signal with “UP” of 0 and “DOWN” of 1 arrives from another device (step S502: UP), the own device When this is recognized, an output signal with the change direction designation signal “UP” of “1” and “DOWN” of 0 is output from the output unit (step S509).

This step S509 has a position of whether to change the target value by itself or passively follow another device, from step S409 in which the signal “UP” is “1” and “DOWN” is 0. The difference is due to the difference.
Hereinafter, Step S510 to Step S514 are the same as Step S410 to Step S414 in FIG.

It is a block diagram showing the uninterruptible power supply parallel system as an embodiment of the present invention and the uninterruptible power supply which constitutes this system. Signal waveforms representing the transition of each of the above-described signals (when an operation for increasing the output voltage value is performed) in the uninterruptible power supply parallel system (first uninterruptible power supply and second uninterruptible power supply) of FIG. FIG. Signal waveform representing transition of each of the above-described signals (when operation in the direction of decreasing the output voltage value is performed) in the uninterruptible power supply parallel system (first uninterruptible power supply and second uninterruptible power supply) of FIG. FIG. The flowchart showing the operation of the uninterruptible power supply parallel system (first uninterruptible power supply and second uninterruptible power supply) of FIG. 1 (when the target value setting operation unit is operated on the own apparatus). It is. Operation of the uninterruptible power supply parallel system (first uninterruptible power supply and second uninterruptible power supply) in FIG. 1 (in response to a signal from another device in which the target value setting operation unit is operated) FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Uninterruptible power supply parallel system 21 and 22 Power receiving side terminal 30 Load side bus 100 1st uninterruptible power supply 102 and 202 Rectifier 103 and 203 Inverter 110 and 210 Target value transmission means 121 and 221 System controller 122 and 222 Output part 123 223 Input unit 131, 132, 133, 134 Buffer (output unit side)
141, 142, 143, 144 Buffer (input side)
231, 232, 233, 234 Buffer (Output side)
241, 242, 243, 244 Buffer (input side)
151, 152, 153, 154 conductor (output side)
161, 162, 163, 164 conductor (input side)
251, 252, 253, 254 Conductor (Output side)
261, 262, 263, 264 Conductor (input side)
301, 302, 303, 304 Signal line

Claims (10)

A plurality of uninterruptible power supply units each having an output voltage adjustment function for adjusting the output voltage value so that the output voltage value of the device matches the target value that can be set from the outside are connected in parallel to a common load-side bus. Uninterruptible power supply parallel system,
Each of the plurality of uninterruptible power supply devices includes a signal output unit that individually outputs a target value increase designation signal, a target value decrease designation signal, and an increase / decrease amount designation signal to other uninterruptible power supply devices, and a self signal output unit. The output target value increase designation signal, the target value decrease designation signal, and the increase / decrease amount designation signal, and the target value increase designation signal, the target value decrease designation signal, and the increase / decrease amount output from another uninterruptible power supply. A signal input unit to which an individual logical sum signal with a designation signal is input, and the target value increase designation signal, the target value decrease designation signal and the increase / decrease amount designation signal output from the signal output unit, and the signal input unit Target value matching means for performing target value matching with other uninterruptible power supply units based on the target value increase designation signal, the target value decrease designation signal, and the increase / decrease amount designation signal. thing Uninterruptible power supply parallel system characterized.   Each of the plurality of uninterruptible power supplies includes a target value setting operation unit for setting the target value, and the target value matching unit is configured to set an increase / decrease amount of the target value in the target value setting operation unit. In response to the setting, one of the target value increase designation signal and the target value decrease designation signal is formed and output to the signal output unit, and the other designation signal from the other uninterruptible power supply is sent to the signal input unit. When input, the increase / decrease amount designation signal is formed and output to the signal output unit, and the formed increase / decrease amount designation signal is compared with the increase / decrease designation signal input to the signal input unit. 2. The uninterruptible power supply parallel system according to claim 1, further comprising increase / decrease transmission means for determining completion and changing a target value based on the increase / decrease when the increase / decrease transmission is completed.   The target value matching unit in each of the plurality of uninterruptible power supply units includes the target value increase designation signal and the target value representing transmission of the increase / decrease amount from the increase / decrease amount transmission unit of another uninterruptible power supply unit to a signal input unit. When one of the decrease designation signals is input, the increase / decrease amount is changed based on one of the target value increase designation signal and the target value decrease designation signal input after responding using the other designation signal, The increase / decrease amount designation signal based on the changed increase / decrease amount is output to the signal output unit, and when the output increase / decrease amount designation signal matches the increase / decrease amount designation signal input in the signal input unit, the changed increase / decrease amount The uninterruptible power supply parallel system according to claim 1 or 2, further comprising an increase / decrease amount changing means for changing the target value based on the above. A plurality of uninterruptible power supply units each having an output voltage adjustment function for adjusting the output voltage value so that the output voltage value of the device matches the target value that can be set from the outside are connected in parallel to a common load-side bus. An uninterruptible power supply that can constitute an uninterruptible power supply parallel system,
A signal output unit that individually outputs a target value increase designation signal, a target value decrease designation signal, and an increase / decrease amount designation signal to another uninterruptible power supply, the target value increase designation signal output from its own signal output unit, and the target An individual OR signal of the value decrease designation signal and the increase / decrease amount designation signal and the target value increase designation signal, the target value decrease designation signal and the increase / decrease amount designation signal output from another uninterruptible power supply is input. Signal input unit, the target value increase designation signal output from the signal output unit, the target value decrease designation signal, the increase / decrease amount designation signal, the target value increase designation signal input to the signal input unit, and the target An uninterruptible power supply comprising: target value matching means for performing target value matching with another uninterruptible power supply based on a value decrease designation signal and the increase / decrease amount designation signal.   A target value setting operation unit configured to set the target value, and the target value matching means increases the target value in response to the setting when an increase / decrease amount of the target value is set by the target value setting operation unit. One of the designation signal and the target value decrease designation signal is formed and output to the signal output unit, and when the other designation signal is input to the signal input unit from another uninterruptible power supply device, the increase / decrease amount designation signal Is formed and output to the signal output unit, and the formed increase / decrease amount designation signal is compared with the increase / decrease designation signal input to the signal input unit to determine the completion of the increase / decrease amount transmission, and the increase / decrease amount transmission is completed. 5. The uninterruptible power supply according to claim 4, further comprising an increase / decrease amount transmission means for changing a target value based on the increase / decrease amount.   When the target value matching means receives one of the target value increase designation signal and the target value decrease designation signal representing transmission of the increase / decrease amount from the increase / decrease amount transmission means of another uninterruptible power supply to the signal input unit The increase / decrease amount is changed based on one of the target value increase designation signal and the target value decrease designation signal input after responding using the other designation signal, and the increase / decrease designation based on the changed increase / decrease amount An increase / decrease amount that outputs a signal to the signal output unit and changes the target value based on the changed increase / decrease amount when the output increase / decrease amount designation signal matches the increase / decrease amount designation signal input at the signal input unit 6. The uninterruptible power supply according to claim 4 or 5, further comprising changing means. A plurality of uninterruptible power supply units each having an output voltage adjustment function for adjusting the output voltage value so that the output voltage value of the device matches an externally set target value are connected to a common load-side bus. An uninterruptible power supply parallel system configured to obtain,
Each of the plurality of uninterruptible power supplies includes a target value setting operation unit provided corresponding to the own device for setting the target value, and a target value set by an operation on the target value setting operation unit. Target value transmission means for transmitting to each other uninterruptible power supply of the uninterruptible power supply parallel system, and the target value transmission means changes the target value to a value higher or lower than the current value. An output unit that outputs both a change direction designation signal that indicates whether to change and a change width defining signal that represents the degree of the change, the change direction designation signal output from the output unit of the device itself, and the change direction designation An input signal of a logical sum with a response signal issued from each other uninterruptible power supply in response to the signal, the change width defining signal output from the output unit of the own apparatus, and a signal issued from each other uninterruptible power supply With the change width regulation signal An input unit that receives an input signal of both logical inputs of the logical sum input signal and the change direction designation signal output from the output unit in any one of the other uninterruptible power supply devices is received by the input unit of the own device In response to this, the change direction designation signal corresponding to the change direction different from the change direction represented by the received change direction designation signal is transmitted from the output unit of the own apparatus through the change direction designation signal conductor. The change received from the output unit of the own device in response to receiving the change width defining signal output from the output unit of any of the other uninterruptible power supply devices at the input unit of the own device Response control means for performing response control so as to transmit the change width defining signal representing the change width represented by the width defining signal, and an input signal of the logical sum input to the input unit is the output of the device. And a target value changing means for changing the target value in the own device to a value corresponding to the change width specified by the change width specifying signal at a timing coincident with the value of the change width specifying signal issued from the section. An uninterruptible power supply parallel system. It has an output voltage adjustment function for adjusting the output voltage value so that the output voltage value of the device matches a target value that can be set from the outside, and has an output voltage adjustment function similar to the output voltage adjustment function An uninterruptible power supply that can be connected to a common load-side bus with other uninterruptible power supplies to form an uninterruptible power supply parallel system,
A target value setting operation unit provided for setting the target value; and target value transmission means for transmitting a target value set by an operation on the target value setting operation unit to the other uninterruptible power supply. The target value transmission means includes both a change direction designation signal indicating whether the target value is changed to a value higher or lower than the current value, and a change width defining signal indicating the degree of the change. A logical sum input signal of the change direction designation signal output from the output section and the response signal issued from the other uninterruptible power supply in response to the change direction designation signal; An input unit that receives an input signal of both logical inputs of a logical sum input signal of a change width regulation signal output from the output unit of the device and a change width regulation signal emitted from the other uninterruptible power supply device; To any uninterruptible power supply The change direction designation signal output from the output unit is different from the change direction represented by the received change direction designation signal from the output unit of the own device in response to receiving the change direction designation signal from the output unit of the own device. The change direction specifying signal corresponding to the change direction is transmitted through the change direction specifying signal conductor, and the change width defining signal output from the output unit in any one of the other uninterruptible power supply devices is used as the change width specifying signal of the own device. Response control means for performing response control so as to transmit the change width defining signal representing the change width represented by the received change width defining signal from the output unit of the own device in response to being received by the input unit; At the timing when the input signal of the logical sum input to the input unit coincides with the value of the change width defining signal issued from the output unit of the own device, the target value in the own device is changed. Uninterruptible power supply, characterized in that it comprises a target value changing means for changing a value corresponding to the change width defined by the width defining signal, a.   The output unit of the target value transmitting means changes a conductor for a change direction designation signal indicating that the target value is changed to a value higher than the current value, and changes the target value to a value lower than the current value. 2 of a pair of change direction specifying signal conductors with a change direction specifying signal conductor to be expressed, and a pair of change width specifying signal conductors for expressing the change width specifying signal as a 2-bit binary signal. The uninterruptible power supply according to claim 8, comprising a pair of conductors.   The input unit of the target value transmission means inputs a logical sum of the change direction designation signal output from the output unit and a response signal issued from the other uninterruptible power supply in response to the change direction designation signal A pair of conductors for a first input signal that represents a signal with one bit for each change direction, a change width defining signal output from the output unit of the own device, and a change issued from the other uninterruptible power supply 9. The method according to claim 8, further comprising two pairs of conductors, a pair of conductors for a second input signal that represents an input signal of a logical sum with a width defining signal as a 2-bit binary signal. Uninterruptible power system.

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