JP3367254B2 - Power supply for power supply system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device of a power supply type system in which a plurality of terminals and a power supply device for supplying power to the terminals are connected via a pair of transmission lines. .

[0002]

2. Description of the Related Art Generally, as shown in FIG.
When the five terminal devices 2a to 2e are connected to the power supply device 1a having the power supply capacity for four terminal devices via the pair of transmission lines 3a and 3b, the power supply device 1a has There is a shortage, and it becomes necessary to newly connect the power supply device 1b.

[0003]

Here, the power supply device 1b is used.
The transmission lines 3a, 3b, the transmission lines 3a, 3b
It is necessary to determine the connected polarity of the power supply device 1a by measuring the voltage between them, and to connect so as to match the polarity of the power supply device 1a. If the power supply device 1b is connected so as to have the opposite polarity, there is a problem that not only power cannot be supplied, but also an overcurrent flows and the power supply devices 1a and 1b themselves are destroyed.

The present invention has been made in view of the above points, and an object of the present invention is to provide a power supply device for a power supply system which can be connected to a transmission line without considering the connection state. To provide.

[0005]

According to a first aspect of the present invention, there is provided a power supply system in which a plurality of terminals and a power supply device for supplying power to the terminals are connected via a pair of transmission lines. a power supply, other electric between the pair of transmission lines
If the source device is connected and if it is connected
Voltage detection means for detecting the voltage state of detecting the polarity of the applied voltage , and connecting the power supply to the transmission line and
Initial state for switching power supply polarity connection state
Does not include a connection means that is not connected to the transmission line and a timer that sets a predetermined time-up value.
Store and start the timer by turning on the power
Until it goes up, the transmission line is changed by the signal from the voltage detection means.
Determine whether another power supply is connected to the
If no other power supply is connected when
The time is set so that its own power source is connected to the specified polarity.
When it detects the connection of another power supply before it comes up
Detects its polarity by the voltage detection means and
Connection control means for controlling switching of the connection means so as to be connected to the same polarity as that of the connection means, and overcurrent flowing between the pair of transmission lines.
And an overcurrent detection means for detecting a current.
The connection control means is connected by the detection signal of the output means.
Reset the timer and reset the timer.
It is characterized in that Tosuru.

According to a second aspect of the present invention, in the first aspect of the invention, the connection control means is a timer timer.
It has a built-in pseudo-random number generator that sets the up value.
The feature is that the time-up value is set by turning on the power.

According to a third aspect of the present invention, in the first or second aspect of the invention, the voltage detecting means detects the level of the voltage between the pair of transmission lines, and the connection control means detects the voltage level. It is characterized in that the switching of the connecting means is controlled so that the power is applied according to the voltage level.

[0008]

[0009]

[Action] In the invention described in claim 1, a plurality of terminal unit and the terminal unit power supply of the power supply systems formed by connecting through a pair of transmission lines and a power supply device for supplying power to the
There is another power supply connected between the pair of transmission lines.
Whether or not, and if connected, applied
Voltage detection means for detecting the voltage state of detecting the polarity of the voltage , the connection of the power supply to the transmission line, and the polarity connection of the power supply.
The state is switched and connected to the transmission line in the initial state
A connection means is set to a state that is not a predetermined Thailand
Built-in timer to set the power-up value to turn on the power
Until the timer is started and the time is up
The signal from the voltage detection means allows another power supply device to be connected to the transmission line.
When the time is up by judging whether or not the connection is established
Is not connected to another power supply,
By the time up so that it is connected to a fixed polarity
When the connection of another power supply is detected, the voltage detection means
Better detects its polarity and connects its own power supply with the same polarity
Overvoltage detecting a connection control means for controlling the switching of the connecting means to be, an overcurrent flowing between the pair of transmission lines
Current detection means, and a detection signal of the overcurrent detection means
Causes the connection control means to initialize the connection means.
With return, by <br/> which is adapted to reset the timer, the system can perform contact <br/> connection of the power supply to operate normally.

According to the invention described in claim 2, claim 1
In the described one, the connection control means is a timer timer.
It has a built-in pseudo-random number generator that sets the mute value,
Since the time-up value is set by turning on the power, the power can be connected without considering the polarity of the power.

According to a third aspect of the present invention, in the first or second aspect of the invention, the voltage level between the transmission lines is detected by the voltage detecting means, and the connection is made according to the detected voltage level. By switching the means, it is possible to connect the power source so as not to be in the overpower state or the overload state.

[0012]

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a power supply device according to an embodiment of the present invention. Reference numeral 11 denotes a power supply device, which includes a voltage detection unit 111, a connection unit 112, a power supply 113, a connection control unit 114, and an overcurrent detection unit 115. The voltage detection means 111 detects whether or not another power supply device is connected between the transmission lines 3a and 3b, and, if connected, the polarity of the applied voltage. The connecting means 112 is the transmission line 3a, 3b of the power source 113.
Connection control means 114 for switching the connection to
The connection to the power supply 113 and its polarity can be switched by a control signal from. Connection control means 1
Reference numeral 14 includes a timer (not shown) and a pseudo random number generator (not shown) for setting a time-up value of the timer, and the transmission time detected by the timer and the voltage detection means 111. The control signal to the connecting means 112 is output based on the polarity information of the voltage applied between 3a and 3b. That is, when the power is turned on, the timer is started, and until the measured time information from the timer reaches a predetermined time (time-up), another power supply device is connected to the transmission lines 3a and 3b by the signal from the voltage detection means 111. If there is no connection with another power supply device when the time is up, the connection means 112 is controlled so that its own power supply 113 becomes a predetermined connection (for example, HIGH side). Output a control signal. On the other hand, when the connection of another power supply device is detected before the time is up, the voltage detection means 111 detects its polarity (which is performed by comparing the potential of the transmission line 3a and the potential of the transmission line 3b). If the potential V1 of the transmission line 3a is higher than the potential V2 of the transmission line 3b with respect to the connection means 112 (positive polarity), the connection means 112 is switched to the HIGH side, In the opposite case (negative polarity), control is performed so as to switch to the LOW side. Therefore, when the power supply device 11 is connected to the transmission lines 3a and 3b, a power supply having the same polarity as the other power supply devices already connected to the transmission lines 3a and 3b is automatically applied.

The overcurrent detecting means 115 includes transmission lines 3a, 3
It detects that the value of the current flowing through b is larger than a predetermined current value, that is, that an overcurrent is flowing, and outputs a detection signal. Upon receiving the detection signal from the overcurrent detection means 115, the connection control means 114 outputs a control signal for disconnecting the power supply 113 from the transmission lines 3a and 3b to the connection means 112. Therefore,
When a plurality of power supply devices are connected to the transmission lines 3a and 3b in reverse polarities and an overcurrent flows, the power supply devices connected to the reverse polarities are disconnected from the transmission lines 3a and 3b.

The operation of this embodiment will be described below with reference to the power supply devices 11a and 11b for the transmission lines 3a and 3b as shown in FIG.
A system in which the five terminals 2a to 2e are connected will be described with reference to the flowchart of FIG. Here, consider a case where the time-up value of the timer in the connection control means 114 is set to, for example, 100, ... For the power supply device 11a and 200, ... For the power supply device 11b. That is, when the timers are started at the same time, the power supply device 11a is set to time up earlier. Note that this setting may be reversed. It is assumed that each of the power supply devices 11a and 11b is in the initial state when the power is turned on, the power supply 113 is set to a state where it is not connected to the transmission lines 3a and 3b, and the power is turned on at the same time. In the connection control means 114 of each of the power supply devices 11a and 11b, the built-in timer starts time measurement at the same time, and until the time is up, whether or not another power supply other than itself is connected to the transmission lines 3a and 3b. Is determined based on the information from the voltage detection means 111. The power supply device 11a times up first, and at this time, the connection control means 114 of the power supply device 11a makes a predetermined connection to the connection means 112, for example, the power supply 11 in this embodiment.
3 is connected to the HIGH side, that is, the transmission line 3
It is controlled so that a is connected to the power supply 113 and the transmission line 3b is connected to the ground side. Note that this connection switching may be determined so as to be the reverse connection.
Therefore, power is supplied from the power supply device 11a to the terminals 2a to 2e via the transmission lines 3a and 3b. On the other hand, in the power supply device 11b, the timer has not yet timed up at this point, and in the connection control means 114, since the power supply device 11a that has timed out earlier is connected to the transmission lines 3a and 3b, the voltage detection means The positive polarity from 111, that is, the information that the power supply device 11a is connected so that the transmission line 3a has a higher potential than the transmission line 3b is detected, and the connection means 112 is on the HIGH side, that is,
The transmission line 3a is connected to the power supply 113, and the transmission line 3b is connected to the ground side. Therefore, the power supply device 11a and the power supply device 11b are connected with the same polarity.

Next, the time-up value of the timer in the connection control means 114 is, for example, 100, 5 for the power supply device 11a.
0, ..., and the power supply device 11b is 100, 200,
... is set, and the connection means 1 of the power supply device 11b is set.
Consider a case where the predetermined connection by 14 is opposite to that of the power supply device 11a and is set to the LOW side. That is, in this case, the power supply devices 11a and 11b
When and are turned on at the same time, the timer times out at the same timing, the power supply 113 is connected to the transmission lines 3a and 3b in opposite polarities, and an overcurrent flows in the transmission lines 3a and 3b. Become. Each power supply device 11a, 11
In b, the overcurrent detection means 115 detects that an overcurrent is flowing in the transmission lines 3a and 3b, and the connection control means 114
Then, a control signal for disconnecting the connection of the power supply 113 is output to the connection unit 112 in response to the overcurrent detection signal from the overcurrent detection unit 115. As a result, the power supply device 11
The power supplies 113 of a and 11b are both disconnected from the transmission lines 3a and 3b, and the continuous flow of overcurrent is prevented. Here, in the power supply devices 11a and 11b, the time-up value of the timer is set to the next value, that is, 50 in the power supply device 11a and 200 in the power supply device 11b, and restarted. This time, the power supply device 11a timed up earlier,
After the power supply is connected, the power supply device 11b determines the polarity of the power supply connection of the power supply device 11a, and then connects the power supply 113 so that the power supply device 11b has the same polarity. Therefore, the transmission line 3a, the 3b power supply 11a, the power supply is not the Rukoto continues connected overcurrent flows at the same polarity by 11b.

According to the present embodiment, the transmission line 3a, when connecting the power supply 11a, and 11b to 3b, the connection can without considering its polarity, also, the power supply apparatus 11a according Rukoto continues overcurrent flows, 11b will not be damaged.

Next, another embodiment of the present invention will be described. In this embodiment, the power supply device 11 described in the above embodiment is used.
The voltage detecting means 111 is provided with a function of detecting the voltage level between the transmission lines 3a and 3b, and the connection control means 114 detects that the system is in an overpower state based on the voltage level detected by the voltage detecting means 111. That is,
Determining if there is an excessive supply of power and an overload condition,
That is, it is determined whether or not too many terminals are connected to the power source, and the control signal to the connecting means 112 is output based on these determinations. In addition, the power supply voltage of the power supply device 11 is 10V,
The output impedance is 100Ω and the terminals 2a to 2h
As shown in FIG. 4, the diode bridge 21
A power supply circuit including the diode 22 and the capacitor 23, a current sink circuit for transmission using the transistor 24 and the resistor 25, a signal reception processing unit 26, and a signal transmission processing unit 27, and the current sinked from the power supply device 11 is 10
By changing from mA to 100 mA, it is possible to superimpose a signal on the supplied voltage and perform time division multiplex communication between the terminals at the timings shown in FIG. Moreover, in each of the terminals 2a to 2h,
The minimum voltage for operation is defined as 6V, for example, and the maximum voltage at the time of signal transmission (when the current is absorbed by the current absorption circuit) for logical judgment of the received signal is, for example, 1V.
Stipulate.

The operation of this embodiment will be described below with reference to the flow charts shown in FIGS. As shown in FIG. 9, the power supply device 1 having the above-mentioned functions on the transmission lines 3a and 3b.
System S1 in which 1a is connected to terminals 2a and 2b
And a system S in which the power supply device 11b having the above-mentioned functions and the terminals 2c and 2d are connected to the transmission lines 3a ′ and 3b ′.
2 and 2 are operating normally, and both systems S1 and
Consider a case where S2 is connected correspondingly to the transmission line 3a and the transmission line 3a 'and the transmission line 3b and the transmission line 3b'. Immediately before connection, both systems S1 and S2 are operating normally, and therefore the process proceeds to the over-power supply process in the flowchart of FIG. Here, both systems S1 and S2
If the terminals are connected to each other, for example, the terminal device 2a becomes the other terminal device 2b.
When a signal is transmitted to ~ 2d, the terminal device 2a sinks a maximum current of 100mA, but the entire system to which the systems S1 and S2 are connected has two power supply devices 11a and 1a.
Since 1b is connected, the voltage between the transmission line 3a (3a ') and the transmission line 3b (3b') becomes 3.5V, which is less than the specified maximum voltage of 1V for signal transmission of the terminal device. I can't. Therefore, as shown in the flow chart of the over-power supply process of FIG. 8, each of the power supply devices 11a and 11b determines that they are in the over-power supply state, sets the time-up value of the timer, and restarts. Then, the power supply devices 11a and 11b (the power supply device 11 in this embodiment) of whichever time is up first
The power source (a) is disconnected from the transmission lines 3a and 3b, and the power supply device 11a proceeds to the overload determination process. This allows the entire system to get out of the overpower state. The power supply device 11a disconnected from the transmission lines 3a and 3b enters the overload determination state, and the other power supply device 11a
b will stand by in an over-powered state.

Power supply unit 11a having entered the overload judgment state
As shown in the flowchart of FIG. 7, it is detected whether or not the voltage between the transmission lines is equal to or lower than the specified minimum voltage 6V. Here, further consider a case where the system S3 is connected. This means that eight terminal devices are connected, the voltage drop due to this is 8 V, and the voltage between the transmission lines is 2 V, which is less than the specified minimum voltage of 6 V. Therefore,
The power supply device 11a, which has entered the overload determination state, determines that the system is in the overload state, connects its own power source 113 to the transmission lines 3a, 3b, and enters the overpower determination state. Therefore,
The entire system can be taken out of the overloaded state and normal operation can be ensured. In this embodiment, the power supply device is 2
Although an example of a table has been shown, it is not limited to this.

As described above, according to the present embodiment, in a system in which a power supply device and a plurality of terminals are connected, even if the power supply device 11a is overloaded or overloaded. , 11b judge these states and adjust the connection of the power supply 113 of its own, so when the system is constructed, the polarity of the power supply 113,
The power supply devices 11a and 11b can be connected without considering the capacity and the capacity of loads such as the terminals 2a to 2h.

[0022]

As described above, according to the first aspect of the present invention, a power supply is formed by connecting a plurality of terminals and a power supply device for supplying power to the terminals via a pair of transmission lines. A power supply unit of a type system, wherein another power supply device is provided between the pair of transmission lines .
Whether or not the power supply is connected
In some cases, the voltage detection means that detects the voltage state, that is, the polarity of the applied voltage, and the connection of the power supply to the transmission line
It is those for switching the polarity connection state of fine power initial shape
In the state, the connection means that is not connected to the transmission line and the timer that sets the predetermined time-up value are set.
Built-in, start timer by turning on the power
Transmitted by the signal from the voltage detection means until the temperature rises
Determine whether another power supply is connected to the line and
If no other power supply is connected when you
Is connected to its own power source with the specified polarity.
When the connection of another power supply unit is detected before
The voltage detection means detects the polarity and
The connection control means for controlling the switching of the connection means so as to be connected to the same polarity as that and the excess current flowing between the pair of transmission lines.
An overcurrent detection unit for detecting a current,
The connection control means is connected by the detection signal of the detection means.
Reset the connection means to the initial state and reset the timer.
Since so as to Tsu DOO, without considering the connection state, it is the could to provide a power supply device for a power-supply system which can be connected to the transmission line.

According to the invention of claim 2, claim 1
In the described one, the connection control means is a timer timer.
It has a built-in pseudo-random number generator that sets the mute value,
Since the time-up value is set by turning on the power, it is possible to connect the power without considering the polarity of the power.

According to the invention of claim 3, claim 1
Alternatively, the voltage detecting means detects the level of the voltage between the transmission lines, and the connecting means is switched according to the detected voltage level, so that an over-power state or an overload state does not occur. It is possible to connect various power sources.

[0025]

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a power supply device of a power supply type system according to an embodiment of the present invention.

FIG. 2 is a system configuration diagram of a power supply type system using the above power supply device.

FIG. 3 is a flowchart showing an operation of the same.

FIG. 4 is a schematic configuration diagram of a terminal according to another embodiment of the present invention.

FIG. 5 is a signal waveform diagram according to another embodiment of the present invention.

FIG. 6 is a flowchart showing an operation according to another embodiment of the present invention.

FIG. 7 is a flowchart showing an operation according to another embodiment of the present invention.

FIG. 8 is a flowchart showing an operation according to another embodiment of the present invention.

FIG. 9 is a system configuration diagram according to another embodiment of the present invention.

FIG. 10 is a system configuration diagram according to a conventional example.

[Explanation of symbols]

2a to 2h terminals 3a, 3b Transmission line 3a ', 3b' transmission line 11, 11a, 11b power supply device 111 voltage detection means 112 connection means 113 power supply 114 connection control means 115 Overcurrent detection means S1-S3 system

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hirotatsu Shinomiya 1048 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works, Ltd. (56) References JP-A-5-199245 (JP, A) JP-A-6-141465 ( JP, A) Japanese Patent Laid-Open No. 5-227653 (JP, A) Actual Development 4-17642 (JP, U) Actual Development 5-2550 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02J 1/00 309 H02H 11/00

Claims (3)

(57) [Claims] 1. A power supply device for a power supply type system, comprising: a plurality of terminals and a power supply device for supplying power to the terminals via a pair of transmission lines; Whether another power supply is connected to the
If so, it means that the polarity of the applied voltage is detected.
To the transmission line of the power supply
It is those of switching the polarity connection state of the connection and power
In the initial state, it is set so that it is not connected to the transmission line.
And connecting means are, data of a predetermined time-up value is set
The timer is started by turning on the power with a built-in immer.
Until the time is up, the signal from the voltage detection means
Judge whether another power supply device is connected to the transmission line.
When the power is turned off and the time is up, the
If not, make sure your power source is connected to the desired polarity.
Detects the connection of another power supply before the time is up
When the voltage is detected, the polarity is detected by the voltage detection means.
Between the pair of transmission lines and the connection control means for controlling the switching of the connection means so that the power source of
An overcurrent detecting unit for detecting an overcurrent flowing,
The connection control means is based on a detection signal of the overcurrent detection means.
Resets the connection means to the initial state, and
Power supply system power supply device characterized by resetting the power supply. 2. The connection control means is a timer
It has a built-in pseudo-random number generator that sets the up value.
The power supply device of the power supply type system according to claim 1 , wherein the time-up value is set by turning on the power. 3. The voltage detecting means detects a voltage level between a pair of transmission lines, and the connection control means controls switching of the connecting means so that power is applied according to the detected voltage level. The power supply device for a power supply type system according to claim 1 or 2, wherein the power supply device is configured as described above.