JP2938291B2 - Remote power control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote power supply control system suitable for remotely controlling power supply of a system having a plurality of power supplies.

[0002]

2. Description of the Related Art Conventionally, when a control device (remote control device) is used to remotely control power-on / shut-down / monitoring of a system device having a plurality of power supplies, each power supply side and the control device are controlled. It was necessary to connect the two with two signal lines. These two signals turn the power ON (ON) / OFF
(Off) a control signal (power-on / shut-down instruction signal),
This is an output signal (power state signal) of the power supply used by the control device to determine whether the power supply is operating normally. FIG. 3 shows a system configuration of such a conventional remote power supply control.

In FIG. 3, a switch SW0 provided corresponding to each power supply PS0 to PS3 of the system device 100 is provided.
To SW3 are remote control devices (hereinafter, RCDs).
ON / OF by remote control from 200
F. By turning on / off the switches SW0 to SW3, AC is turned on / off for the power supplies PS0 to PS3. Power supplies PS0 to PS3 are connected to switches SW0 to S
When AC is received by the ON operation of W3, the device MOD0
To MOD3 are supplied with power required for the operation of the devices MOD0 to MOD3. Data conversion modules TR0 to T
R3 converts the state of the power supplies PS0 to PS3 (power supply state) into a transmission signal and outputs it to the RCD 200.

The RCD 200 includes an MPU (microprocessor) 201 and a ROM (program ROM) 202
, A RAM 203, and registers R0 to R3 provided corresponding to the power supplies PS0 to PS3. The registers R0 to R3 are supplied from the MPU 201 to the switches SW0 to SW3.
3 is turned on / off, and a signal line LR is sent from the data conversion modules TR0 to TR3 in the system device 100.
0 to LR3 are used to hold data signals (power supply status signals), respectively.

The MPU 201 in the RCD 200 turns on / off the switches SW0 to SW3 in the system device 100.
To perform F control, a power on / off instruction signal is set in the registers R0 to R3. Then, this power on /
The shutoff instruction signal is sent from the registers R0 to R3 to the signal line LT0.
To LT3, and is supplied to the switches SW0 to SW3 via the data conversion modules TT0 to TT3 in the same device 100. This allows
Switches SW0 to SW3 are turned ON / OFF.

As described above, the MPU 20 in the RCD 200
1 denotes power supplies PS0 to PS3 in the system device 100,
Control is performed individually via signal lines LT0 to LT3. With this control, the MPU 201 controls each power supply PS in order to prevent a rush current generated at the time of AC input as a system.
0 to PS3 in order.

During normal operation, the MPU 201 confirms that the status of the power supplies PS0 to PS3 is normal. Therefore, the MPU 201 uses the data conversion module T
A power supply state signal transmitted from R0 to TR3 via signal lines LR0 to LR3 is fetched via registers R0 to R3, and it is determined from the signal state whether the power supplies PS0 to PS3 are operating normally.

[0008]

As described above, in the conventional remote power supply control method, in the example where four power supplies are remotely controlled as shown in FIG. 3, eight remote control devices (RDCs) and system devices are used. It was necessary to connect with the signal of. Similarly, for example, in the case of a system device having eight power supplies, a remote control device and a system device are connected by 16 (2 × 8) signals, and in the case of a system device having n power supplies, It was necessary to connect the remote control device and the system device with 2n signals.

As described above, conventionally, when the power on / off / monitoring control is to be performed remotely, two signal lines are required for each power supply, so that the larger the number of power supplies, the larger the scale. There is a problem that it becomes a complicated structure.

Conventionally, when the power of the remote control device is cut off or when the remote control device breaks down,
There is a problem that all power supplies controlled by the device are shut off. Further, conventionally, when a signal line is disconnected, there is a problem that a power supply corresponding to the signal line is cut off.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a remote power control system capable of realizing remote control of power-on / off / monitoring of a system device having a plurality of power supplies with a small-scale mechanism. To provide. Another object of the present invention is to provide a remote power supply control method capable of preventing a power supply cutoff malfunction.

[0012]

SUMMARY OF THE INVENTION The present invention relates to a remote power supply control system for remotely controlling a plurality of power supplies provided in a system device from a remote control device, for turning on / off a corresponding power supply for each power supply. In addition to the switch means and power state data generating means for generating power state data indicating the state of the corresponding power supply, a first data holding means having a data shift function corresponding to each power supply is provided on the remote control device side. At the same time, the system device has a second data shift function corresponding to each power supply.
The first and second data holding units are connected by a ring via a serial bus, so that the corresponding first and second data holding units can be connected to each other.
The data is exchanged according to the shift clock.
Further, for each power supply, on / off control of the corresponding switch means is performed based on power-on / off instruction data for instructing power-on or power-off given from the second holding means corresponding to the power supply. In addition to providing the on / off control means, the remote control device shift-inputs the power-on / off instruction data to the second data holding means via the corresponding first data holding means and the serial bus. Power on / off remote control means for supplying data to the corresponding on / off control means, and power state data generated by each power state data generating means are held in the corresponding second data holding means. Then, a shift input is made to the corresponding first data holding means via the serial bus, and the input data is read to determine the power state by reading the input data. Characterized in that a means viewing.

Further, according to the present invention, when the power-on / off remote control means instructs power-off, the power-off permission signal for notifying that the instruction is valid is transmitted via a specific signal line of the serial bus. And the on / off control means transmits the signal to each on / off control means.
A power-on / power-off instruction data for instructing power-off is provided, and the power-off permission signal is transmitted to switch off the switch means.

[0014]

In the above configuration, when power on / off control is required, power is supplied from the power on / off remote control means of the remote control device to the first data holding means (shift register SS) corresponding to the power supply. / Shut-off control data is set, and the serial bus is controlled to shift the data by the number of the second holding means (shift register SR), so that the shift register SR corresponding to the shift register SS stores the data. The data set in the shift register SS is shifted and input, and the data is further passed from the shift register SR to the corresponding on / off control means (control module CH). The control module CH controls the switch means according to the data passed from the shift register SR. Thereby, the turning on / off of the corresponding power supply is controlled.

As described above, in the above configuration, while the remote control device and the system device are connected by one serial bus, the shift register SS of the remote control device corresponding to the power supply to be controlled is connected.
Only by setting power-on / shut-down instruction data and performing shift control, the data is shifted and input to a shift register SR of the system device corresponding to the power supply to be controlled, and the shift control is performed from the register SR. The power-on / shut-off can be controlled by passing to the control module CH. In addition, the number of signals constituting the serial bus connecting the remote control device and the system device required for this control does not increase even if the number of power supplies in the system device increases.

On the other hand, when power supply monitoring is necessary, the power supply monitoring means of the remote control device stores the power supply state data generated by each power supply state data generation means in the corresponding shift register SR, By controlling the serial bus to shift data by the number of shift registers SR, shift input is made to the corresponding shift register SS via the serial bus, and the state of each power supply is read by reading the input data. to decide.

A dedicated line for transmitting a power-off permission signal is provided to the serial bus, and power-on / off remote control means transmits data for instructing power-off to the shift register SS.
, When the shift operation is performed, the power-off permission signal is activated.
When the data passed from the shift register SR instructs power-off, the off-control means confirms that the power-off permission signal on the serial bus becomes active, and then turns off the switch means. By doing so, for example, due to a malfunction of the shift register SR,
Even if the data passed to the control module CH is garbled to instruct power-off, erroneous power-off can be prevented. In addition, even if the remote control device fails or the serial bus is disconnected, it is possible to prevent the power supply from being accidentally shut off.

[0018]

An embodiment of the present invention will be described below with reference to the drawings. The same parts as those in FIG. 3 are denoted by the same reference numerals, and detailed description is omitted. FIG. 1 is a block diagram showing an embodiment of the present invention.

In FIG. 1, reference numeral 10 denotes, for example, four power supplies P
S0 to PS3, and a system device having devices MOD0 to MOD3 which operate by receiving power supply from the power sources PS0 to PS3, and 20 is a power supply PS0 to MOD3 in the system device 10.
RCD for remote control of turning on / off / monitoring of PS3
(Remote control device).

In the system device 10, the power supplies PS0 to PS0
In the input stage of PS3, switches SW0 to SW3 having a remote ON / OFF function for turning on / off AC are provided.
Is connected. In the output stage of the power supplies PS0 to PS3, a data conversion module TR0 that converts the state of the power supplies PS0 to PS3 into a 2-bit transmission signal (power supply state signal) and outputs it to shift registers SR0 to SR3 described later.
To TR3 are connected. The data conversion modules TR0 to TR3 set the power status signal to "01" when the power supplies PS0 to PS3 are in the OFF state, and to "10" when the power supplies PS0 to PS3 are in the ON state. I have.

The switches SW0 to SW3 are constituted by, for example, electromagnetic switches. The switches SW0 to SW3 are connected to storage modules FF0 to FF3 for storing, for example, 1-bit information for controlling ON / OFF of the switches SW0 to SW3.

The storage modules FF0 to FF3 have the same F
Control module C for setting / resetting F0 to FF3
H0 to CH3 are connected. This control module C
H0 to CH3 are connected to, for example, 2-bit shift registers SR0 to SR3 having a data shift function and a serial bus SBUS to be described later.

The control modules CH0 to CH3 set the storage modules FF0 to FF3 when data for instructing power-on (power-on instruction data) is given from the shift registers SR0 to SR3. When the control modules CH0 to CH3 are supplied with power shutoff instruction data (power shutoff instruction data) from the shift registers SR0 to SR3, the control modules CH0 to CH3 send the serial bus SBUS from the RCD 20 to the serial bus SBUS.
The memory modules FF0 to FF3 are reset after waiting for a shut-off permission instruction via the CPU.

On the other hand, the RCD 20 has an MPU (microprocessor) 21 serving as a control center of the apparatus, a ROM (program ROM) 22 for the MPU 21, and a RAM 23 for the MPU 21. The RCD 20 also has power supplies PS0 to
It has, for example, 2-bit shift registers SS0 to SS3 provided corresponding to PS3, and a control unit (hereinafter referred to as S-CNT) 24 for controlling a serial bus SBUS described below. The shift registers SS0 to SS3 are MP
It has data transfer and data shift functions with U21.

Each of the shift registers SS0 to SS0 in the RCD 20
SS3 and each of the shift registers SR0 to SR3 in the system device 10 are used to enable data shift.
They are connected by a ring via a serial bus SBUS. The shift registers SS0 to SS0 on this serial bus SBUS
The order of SS3 matches the order of shift registers SR0 to SR3. The serial bus SBUS includes a data bit signal, shift registers SS0 to SS3, SR0.
To SR3, a transfer clock signal for writing data held in the shift registers SR0 to SR3 to the control modules CH0 to CH3, a data conversion module TR
It is composed of five signal lines used for transferring a transfer data read instruction signal for reading output data (power supply state signals) from 0 to TR3 into shift registers SR0 to SR3, and a power cutoff permission signal. Next, the operation of the configuration of FIG. 1 will be described.

First, the RCD (remote control device) 20 operates by receiving AC power from a power source different from the power sources PS0 to PS3 to be controlled. R
When AC power is supplied to the RCD 20, the CD 20 (the MPU 21 in the CD 20) performs a self-initialization operation according to an initialization program in the ROM 22, and according to the system status, (1) a power-on operation, (2) a power monitoring operation, One of the five basic operations of (3) power shutoff operation, (4) power shutoff operation during maintenance, and (5) power on operation during maintenance is started. This system status and R
FIG. 2 shows the correspondence between the basic operation performed by the CD 20 and the basic operation.

As is apparent from FIG. 2, RCD 20
The power supply is turned on when the system starts up, and the power supply is monitored during normal operation. The RCD 20 performs a power-off operation when the system is stopped, and performs a power-off operation or a power-on operation at the time of maintenance during maintenance work.

In this embodiment, as will be described later, RC
Even if the power supply of D20 is cut off, the power supply PS0 to
The power supply of PS3 is configured not to be cut off. Therefore, the power of the RCD 20 can be turned on again during the control, and a mechanism for determining which operation should be performed after the self-initialization is provided as a flag in the RCD 20.

In the power-off operation at the time of maintenance work, first, only the power supply PSi (i = 0 to 3) of the maintenance target device is turned off by operating a switch or a terminal device.
The RCD 20 is notified to perform the FF, and the RCD 20 turns off only the power supply PSi of the maintenance target device. Similarly, regarding the power-on operation during the maintenance work, when the maintenance work is completed, the RCD 20 is notified by a switch operation or a terminal device operation to turn on only the power supply PSi of the maintenance target apparatus. Only the power supply PSi of the maintained device is turned on. Hereinafter, the above five basic operations by the RCD 20 will be described in order. (1) Power-on operation

First, the RCD 20 detects the power supply P of the control target device.
A basic operation procedure when Si (i = 0 to 3) is input will be described. Although there are several possible power-on procedures, here, a method of applying one power supply PSi by one operation is applied. This is because there is an effect of suppressing a rush current generated when the power is turned on. The power-on sequence in this embodiment is PS0 → PS1.
→ PS2 → PS3.

The MPU 21 in the RCD 20 first receives a power supply P
In order to control the power-on of S0, data (for example, "10") for instructing power-on is set in a shift register SS0 provided corresponding to the power supply PS0.
The MPU 21 sets data (for example, "00") indicating that power is not turned on / off in the shift registers SS1 to SS3 corresponding to the other power supplies PS1 to PS3.

Next, the MPU 21 controls the S-CNT (serial bus control unit) 24 to shift the shift registers SR0 to SR0.
The data shift operation for the number of SR3 is performed by the shift clock. Here, since each data has 2 bits as one word, the four shift registers SR0 to SR3 perform eight shifts.

Then, the power-on instruction data "10" set in the shift register SS0 is transmitted to the serial bus SB.
The data is serially transferred via the US data bit signal line and input to and held in the shift register SR0 (of the shift registers SR0 to SR3). Similarly, the data “00” set in the shift registers SS1 to SS3 is
The input is held in the shift registers SR1 to SR3.

Next, the MPU 21 controls the S-CNT 24 to activate the transfer data write signal on the serial bus SBUS. Then, the power-on instruction data "10" held in the shift register SR0 is transferred to the control module CH0.

When the control module CH0 receives the power-on instruction data “10” from the shift register SR0,
Set the storage module FF0. Then, a power-on instruction is issued from the storage module FF0 to the switch SW0, the switch SW0 is turned on, and AC is supplied to the power supply PS0. The power supply PS0 receives this AC input and supplies power to the device MOD0.

On the other hand, the data "00" held in the shift registers SR1 to SR3 is transferred to the control modules CH1 to CH3 according to the transfer data write signal.
Since the data indicates that the power is not turned on / off, the control modules CH1 to CH3 are stored in the storage modules FF1 to FF3.
No operation is performed on FF3. Therefore, the state of the switches SW1 to SW3 does not change.

When the power supply PS0 is turned on as described above, the MPU 21 in the RCD 20 turns on the power supplies PS1 and P2.
The same control operation is repeated when the power sources of S2 and PS3 are turned on. In this case, the power-on instruction data "10" is set only in the shift registers SS0 to SS3 provided corresponding to the power supply to be controlled for power-on, and the other registers include Of course, it is necessary to set data indicating that power is not turned on / off. (2) Power supply monitoring operation

Next, the RCD 20 is connected to the power supply P of the device to be controlled.
A basic operation procedure when monitoring Si (i = 0 to 3) will be described. This monitoring operation is performed periodically during system operation.

When performing power supply monitoring (power supply state confirmation) operation, the MPU 21 in the RCD 20
4 to activate the transfer data read signal on the serial bus SBUS. Then, the output data of each of the data conversion modules TR0 to TR3, that is, the power supply PS0
A 2-bit power supply state signal indicating the state of .about.PS3 is read into shift registers SR0 to SR3.

Next, the MPU 21 controls the S-CNT 24 to perform the data shift operation for the number of the shift registers SR0 to SR3 by the shift clock. Here, since each data has 2 bits as one word, the four shift registers SR0 to SR3 perform eight shifts.

Then, the 2-bit power supply status signal (power supply status data) read into the shift register SR0 (indicating the status of the power supply PS0) is serially transferred via the data bit signal line of the serial bus SBUS to the RCD20.
(Of the shift registers SS0 to SS3). Similarly, the data stored in the shift registers SR1 to SR3 (the power supplies PS1 to PS3
The power supply state signal of 2 bits is input and held in the shift registers SS1 to SS3. Next, MPU21
Reads the data held in the shift registers SS1 to SS3 and judges the state of the power supplies PS1 to PS3 from the data.

That is, the MPU 21 operates the shift register SSi.
If the data read from (i = 0-3) is "01", it is determined that the power supply PSi is in the OFF state, and "1"
If 0 ", it is determined that the power supply PSi is in the ON state.

On the other hand, the shift register SSi (i =
Data read from 0-3) is "00" or "11"
In this case, the MPU 21 determines that the data is data that is not originally output from the shift register SRi, and thus the disconnection of the serial bus SBUS and the data conversion module TR
It is determined that it is an abnormality such as a failure of i. Even if the data read from the shift register SSi is "01" or "10", if the data is different from the data previously set in the shift register SSi by the MPU 21, it is determined that an abnormality has occurred. When detecting an abnormality, the MPU 21 outputs a system alarm to notify the administrator.

By performing the above power supply monitoring operation periodically during the operation of the system and by performing it after one power-on operation, the state of the power supply can be immediately confirmed, and the power supply abnormality at the time of power-on can be promptly detected. Can be found. (3) Power shutdown operation

Next, the RCD 20 is connected to the power supply P of the device to be controlled.
A basic operation procedure for blocking Si (i = 0 to 3) will be described. It should be noted that several power-off procedures can be considered, but here, all power supplies PS0 to PS0 are operated by one operation.
The method of shutting off PS3 at the same time is applied.

The MPU 21 in the RCD 20 first receives the power
In order to control the simultaneous power-off of S0 to PS3, shift registers S provided corresponding to the power supplies PS0 to PS3 are provided.
In each of S0 to SS3, data (for example, "01") for instructing to shut off the power is set.

Next, the MPU 21 controls the S-CNT 24 to perform the data shift operation for the number of the shift registers SR0 to SR3 by the shift clock. Here, since each data has 2 bits as one word, the four shift registers SR0 to SR3 perform eight shifts.

Then, the power-off instruction data "01" set in the shift registers SS0 to SS3 respectively becomes
The data is serially transferred via the data bit signal line of the serial bus SBUS and input to and held in the shift registers SR0 to SR3.

Next, the MPU 21 controls the S-CNT 24 to activate the transfer data write signal on the serial bus SBUS. Then, the shift registers SR0 to
Power-off instruction data “01” held in SR3
Is passed to the control modules CH0 to CH3. Subsequently, the MPU 21 controls the S-CNT 24 to activate the power cutoff permission signal on the serial bus SBUS.

The control modules CH0 to CH3 transmit power-off instruction data "0" from shift registers SR0 to SR3.
1 ", the serial bus SBU is used to determine whether it is correct power-off instruction data.
It waits for the supply of a power cutoff permission signal via S. When the power supply cutoff permission signal is supplied from the S-CNT 24 via the serial bus SBUS under the control of the MPU 21 as described above, the control modules CH0 to CH3
It is determined that the power-off instruction data “01” passed from the shift registers SR0 to SR3 before that is correct,
The corresponding storage modules FF0 to FF3 are reset. That is, the control modules CH0 to CH3 receive the power-off instruction data "01" from the shift registers SR0 to SR3 and receive the power-off permission signal from the serial bus SBUS for the first time.
0 to FF3 are reset. Therefore, the storage modules FF0 to FF3 may be reset erroneously due to failure of the shift registers SR0 to SR3 in the system device 10, disconnection of the serial bus SBUS, interruption of the AC power supplied to the RCD 20, or failure of the RCD 20. There is no.

When the storage modules FF0 to FF3 are reset, the power-on instruction for the corresponding switches SW0 to SW3 is cleared, the switches SW0 to SW3 are turned off, and the AC supply to the power supplies PS0 to PS3 is cut off. (4) Power-off operation at the time of maintenance In this embodiment, the maintenance work is performed by turning off the power of the device to be maintained.
Perform after FF. The basic procedure of the power-off operation at the start of the maintenance work will be described.

The maintenance worker turns on the power supply of the target device by, for example, operating a switch or operating a terminal device.
Notify 20. Here, it is assumed that PS0 has been notified as the power source of the maintenance target device.

Then, the MPU 21 in the RCD 20 sets the power supply PS0 as an object of power cutoff control and sets data "01" for instructing power cutoff in the shift register SS0 corresponding to the power supply PS0. MPU21
Sets data "00" indicating that power is not turned on / off in the shift registers SS1 to SS3 corresponding to the other power supplies PS1 to PS3.

Next, the MPU 21 controls the S-CNT 24 to perform the data shift operation for the number of the shift registers SR0 to SR3 by the shift clock. here,
Since each data has 2 bits as one word, four shift registers SR0 to SR3 perform eight shifts.

Then, the power-off instruction data "01" set in the shift register SS0 is transmitted to the serial bus SB.
The data is serially transferred via the US data bit signal line and input to and held in the shift register SR0. Similarly,
The data "00" set in the shift registers SS1 to SS3 is input and held in the shift registers SR1 to SR3.

Next, the MPU 21 controls the S-CNT 24 to activate the transfer data write signal on the serial bus SBUS. Then, the power-off instruction data "01" held in the shift register SR0 is transferred to the control module CH0. The data "00", which is stored in the shift registers SR1 to SR3 and indicates that power is not turned on / off, is stored in the control module CH1.
To CH3. Subsequently, the MPU 21 executes the SC
By controlling the NT24, the power cutoff permission signal on the serial bus SBUS is activated.

The control module CH0 resets the storage module FF0 when receiving the power-off instruction data "01" from the shift register SR0 and receiving the power-off permission signal from the serial bus SBUS as described above. This clears the power-on instruction for the switch SW0, turns off the switch SW0, and turns off the power supply P.
The AC supply to S0 is cut off.

On the other hand, shift registers SR1 to SR1
Data “0” indicating that power is not turned on / off from 3
The control modules CH0 to CH3 that have received "0" do nothing to the storage modules FF1 to FF3 regardless of the power-off permission signal from the serial bus SBUS. Thus, the states of the switches SW1 to SW3 are maintained. (5) Power-on operation during maintenance

In this embodiment, since the maintenance work is performed after the power of the maintenance target device is turned off, it is necessary to turn on the power after the maintenance work is completed. The basic procedure of the power-on operation when the maintenance work is completed will be described.

The maintenance worker notifies the RCD 20 of the power supply of the target device by operating a switch or a terminal device. Here, it is assumed that PS0 has been notified as the power source of the target device.

Then, the MPU 21 in the RCD 20 sets the power supply PS0 as an object of power-on control, and sets data "10" for instructing power-on in the shift register SS0 corresponding to the power supply PS0. MPU21
Sets data "00" indicating that power is not turned on / off in the shift registers SS1 to SS3 corresponding to the other power supplies PS1 to PS3.

Next, the MPU 21 controls the S-CNT 24 to cause the shift registers SR0 to SR3 to perform the data shift operation by the number of shift clocks. here,
Since each data has 2 bits as one word, four shift registers SR0 to SR3 perform eight shifts.

Then, the power-on instruction data "10" set in the shift register SS0 is transmitted to the serial bus SB.
The data is serially transferred via the US data bit signal line and input to and held in the shift register SR0. Similarly,
The data "00" set in the shift registers SS1 to SS3 is input and held in the shift registers SR1 to SR3.

Next, the MPU 21 controls the S-CNT 24 to activate the transfer data write signal on the serial bus SBUS. Then, the power-on instruction data "10" held in the shift register SR0 is transferred to the control module CH0. The data "00", which is stored in the shift registers SR1 to SR3 and indicates that power is not turned on / off, is stored in the control module CH1.
To CH3.

When the control module CH0 receives the power-on instruction data “10” from the shift register SR0,
Set the storage module FF0. Then, a power-on instruction is issued from the storage module FF0 to the switch SW0, the switch SW0 is turned on, and AC is supplied to the power supply PS0. The power supply PS0 receives this AC input and supplies power to the device MOD0.

On the other hand, the data "00" held in the shift registers SR1 to SR3 is transferred to the control modules CH1 to CH3 according to the transfer data write signal.
Since the data indicates that the power is not turned on / off, the control modules CH1 to CH3 are stored in the storage modules FF1 to FF3.
No operation is performed on FF3. Therefore, the state of the switches SW1 to SW3 does not change.

[0067]

As described in detail above, according to the present invention,
A first data holding unit having a data shift function corresponding to each power supply is provided on the remote control device side, and a second data holding unit having a data shift function corresponding to each power supply is provided on the system device side. By connecting the first and second data holding means in a ring connection with a serial bus, data is transmitted and received between the corresponding first and second data holding means in accordance with a shift clock. When the on / off control is necessary, the data for that is shifted from the first data holding means to the corresponding second data holding means and passed to the corresponding on / off control means. Controlling the power on / off of the target power supply, and when the power supply needs to be monitored, the data indicating the power supply state is held in the corresponding second data holding means. Later, the input is shifted to the corresponding first data holding means via the serial bus, and the input data is read to determine the power supply state. As compared with the conventional method that requires the number of signal lines corresponding to the number of power supplies, remote control of turning on / off / monitoring of power in the system device can be realized with a small-scale mechanism. In addition, since the above remote control can be performed via a common serial bus, even if the number of power supplies in the system device increases, the remote control device and the system device necessary for turning on / off / monitoring the power supply are connected. The number of connected signal lines does not increase.

Further, according to the present invention, the data for instructing the power-off from the remote control device is set in the first data holding means to perform the shift operation, and the data is shifted to the corresponding second data holding means. When a shift input is made, a power cutoff permission signal notifying that the data is valid is transmitted to each on / off control means on the system device side via a specific signal line of the serial bus, and this on / off control signal is transmitted.
If the data passed from the corresponding second data holding means instructs power-off, the off-control means confirms that the power-off permission signal on the serial bus becomes active, and then turns off the power. By applying the control configuration, it is possible to prevent the power from being cut off erroneously even if a failure of the remote control device, a disconnection of the serial bus, a failure of the first or second data holding means, or the like occurs. Can be.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is an RCD (remote control device) in FIG.
FIG. 5 is a diagram illustrating five basic operations performed by the system according to the system status.

FIG. 3 is a block diagram showing a conventional example.

[Description of Signs] 10: System device, 20: Remote control device (RCD), 21: Microprocessor (MPU, power on / off remote control means, power monitoring means), 24: Serial bus control unit (S-CNT) , SS0 to SS3 ... shift register (first data holding means), SBUS ... serial bus, SR0 to SR3 ... shift registers (second data holding means), PS0 to PS3 ... power supply, SW0 to SW
3 ... switch, FF0 to FF3 ... storage module, CH
0 to CH3: control module (on / off control means),
TR0 to TR3 Data conversion module (power supply state data generating means).

Claims (2)

(57) [Claims] In a remote power supply control system for remotely controlling a plurality of power supplies provided in a system device from a remote control device, a plurality of power supplies are provided corresponding to the plurality of power supplies, respectively, for turning on / off the corresponding power supplies. Switch means, power state data generating means provided corresponding to each of the plurality of power supplies, and generating power state data indicating a state of the corresponding power supplies, and the remote control corresponding to each of the plurality of power supplies. A first data holding unit having a data shift function provided on the device side; a second data holding unit having a data shift function provided on the system device side corresponding to each of the plurality of power supplies; A serial bus ring-connecting the first and second data holding means provided for each of the power supplies; The switch means corresponding to each of the plurality of power supplies based on power-on / shutdown instruction data for instructing power-on or power-off provided from the corresponding second holding means. On / off control means for controlling on / off of the power supply, and the power on / off operation from the remote control device to the second data holding means via the corresponding first data holding means and the serial bus. Power-on / off remote control means for causing shift input of instruction data and supplying the data to the corresponding on / off control means; and the power state data generated by each power state data generating means, After being held by the corresponding second data holding means, the data is shifted to the corresponding first data holding means via the serial bus. Is the force, remote power control method characterized by comprising a power supply monitoring means for determining the power state by reading the input data. 2. The power-on / off remote control means, when instructing power-off, sends a power-off permission signal for notifying that the power-on / off instruction data is valid via a specific signal line of the serial bus. When the power-on / off instruction data for instructing power-off is given from the corresponding second holding means, the power-on / off control data is transmitted to the on / off control means. 2. The remote power control system according to claim 1, wherein said switch means is turned off when said power cutoff permission signal is transmitted.