JPS62247735A - Electric source controller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power supply control circuit used in computers, etc., which processes external power-on and power-off signals using a microprocessor to control a lower power supply unit.

[Conventional technology]

As a conventional power supply control circuit, there is one shown in the block diagram of FIG. 2, for example. This circuit is used for external command signals such as power on/off, emergency cutoff signals, etc.
- An input receiving circuit 1 that receives a status report signal from the node, and an input port 3. Control microprocessor 4. A power supply control section 2 including an output port 52 and an oscillator 11, and an input terminal 8
A reset circuit 9 that performs reset by a signal from
It is composed of an AND circuit 10 and an output circuit 6.

The control microprocessor 4 is initialized by the reset 1 signal A from the reset circuit 9 and performs internal operations by the output of the oscillator 11. The power supply control unit 2 has an input port 3
receives the signal from the input receiving circuit 1, and outputs the signal from the output port 5.
It outputs a command signal to the lower level and a report signal to the outside, and outputs a clear signal B after the reset signal input and oscillator input signal are determined and internal initialization is completed. The reset circuit 9 is
When the input power of the power supply control circuit is turned on, a reset signal is sent to the power supply control section 2 and the AND circuit 10. AND circuit 1
0 inputs the output of the reset circuit 9 and the output of the clear signal B and outputs it to the output circuit 6, and the output circuit 6 inputs the output of the AND circuit 10 and the output of the output port 5 to the lower power supply unit. outputs command signals and status report signals to the outside.

Turns on/off power to input receiving circuit 1 from outside.

When receiving a command signal such as an emergency disconnection signal or a status report signal from a lower power supply unit, the control microprocessor 4 receives the command signal or status report signal from the input port 3, and processes it according to a predetermined logical time. An instruction No. 18 to the lower power supply unit or a report signal to the outside is sent to the output port 5, and is sent to the lower power supply unit 1 to the outside through the output circuit 6.

In addition, when the input power of the power supply control circuit is turned on by the circuit 9 to the reset 1, the oscillator 11 waits for the input power to reach the specified voltage.
After waiting for stable operation time, input it to the control microprocessor 4 as a reset signal, and the control microprocessor 4 outputs a clear signal B after internal initialization, and when the condition matches the reset signal A, it is input to the output circuit 6. and enables the command signal to the lower power supply unit or the report signal to the outside for the first time. Also, when the input power to the power supply control circuit is turned off,
The reset circuit 9 resets the control microprocessor 4, which is also input to the output circuit 6 and output to the lower power supply unit 1.
~ Or the report signal to the outside is disabled to prevent incorrect commands and reports.

[Problem that the invention seeks to solve]

In the conventional power supply control circuit described above, if a stall occurs due to a programming error due to noise in the control microprocessor 4, unexpected input conditions, or insufficient debugging, the power supply cannot be turned on or off from the outside. , command signals such as emergency disconnection signals, and status report signals from lower power supply units may not be accepted. Among these command signals, in the power-on signal, when this signal comes, a shutdown has occurred, or if it has occurred, the power simply cannot be turned on, resulting in a failure, and the input to the power supply control circuit. It is possible to return to the initial state by turning the power off and then on again, but a situation where the power cannot be turned off poses an operational problem, and in order to recover, it is necessary to turn off the switch on the distribution board and then turn it on again. This is a problem, especially in large systems. Further, an emergency disconnection instruction is issued in the event of an unexpected situation such as a fire, an earthquake, or a flood, and it is necessary to immediately disconnect the power to the system, but if the power cannot be disconnected immediately, a major problem will occur.

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and provide a power supply control circuit that can perform power supply control without any trouble even if the control microprocessor is idle.

[Means for solving problems]

The configuration of the power supply control circuit of the present invention includes an input receiving circuit that receives power-on and power-off command signals from an external device and a status report signal from a lower power supply; and an input port that receives command signals from this input receiving circuit. a microprocessor that is initialized by a reset signal, outputs a clear signal at the end of this initialization, and outputs a command signal to the lower-level device and a status report signal to the external device via an output port. an output circuit that outputs a signal from the output port to the lower device; a reset circuit that outputs the reset signal when the power is turned on and when a reset request signal is input; a logic circuit that outputs a signal to the output circuit when the clear signal is present; and: a request signal to the reset 1 after a time longer than the maximum delay time of the command output of the power supply control section when the power supply disconnection command signal is present. and a delay circuit that outputs a signal and stops its operation in response to a disconnection command signal to the lower device.

Example] Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. This embodiment includes an input receiving circuit 1 which receives command signals such as power-on, power-off, and emergency disconnection signals from the outside, and a status report signal from a lower power supply unit; and an input port 3. Control microprocessor 4. The control microprocessor 4 is initialized by the reset signal A, performs internal operation by the output of the oscillator 11, receives a signal from the human power receiving circuit 1 through the input port 3, and outputs the output port 1. -5 outputs a command signal to the lower level and a status report signal to the outside, and outputs a clear signal B after the reset signal A and input from the oscillator 11 are confirmed and the internal initialization of the control microprocessor 4 is completed. a power supply control unit 2;
This power supply control unit 2 has a reset circuit 9 that outputs reset signals M and A;
an AND circuit 10 which inputs the signal A and the clear signal B from the power supply control section 2 and outputs the logical product thereof; and a power supply control section when a power cutoff and emergency cutoff signal from the outside is inputted to the input receiving circuit 1; 2 and the delay circuit 7, and after the power cutoff and emergency cutoff signals are inputted, the lower power supply unit 1
a delay circuit 7 that outputs a heliset request signal to the reset circuit 9 after a time longer than the maximum delay time until it outputs a disconnection command signal to ~, and stops its operation upon input of the disconnection command signal to the lower power supply unit; and an output circuit 6 which determines and outputs a status report signal to the outside and a command to run out when a signal from the AND circuit 10 arrives.

In this embodiment with the second configuration, if a power cutoff signal and an emergency cutoff signal are input from the outside and the control microprocessor is stalled, it becomes impossible to issue a cutoff command signal to the lower power supply module. By applying a reset signal to the control processor through the delay circuit, the control processor can be initialized and forcibly issue a disconnection command signal to the lower power supply module.

In addition, if a power cutoff signal and an emergency cutoff signal are input from the outside and the control processor is not stalled, a normal cutoff command signal is output to the lower power supply module and is input to the delay circuit. will stop its operation.

〔Effect of the invention〕

As explained above, according to the present invention, even if the control microprocessor is stalled or not stalled, it is possible to issue a disconnection command signal to the lower power supply module. Even if the system fails, normal power shutoff and emergency power shutoff can be performed without any problem.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of an example of a conventional device. DESCRIPTION OF SYMBOLS 1... Input receiving circuit, 2... Power supply control section, 3... Input port, 4... Control microprocessor, 5...
・Output port, 6...output circuit, 7...delay circuit,
8... Reset circuit input power supply terminal, 9... Reset circuit, 10... AND circuit, 11... Oscillator.

Claims (1)

[Claims] An input receiving circuit that receives command signals for powering on and powering off from external devices and receiving status report signals from lower power supplies; command signals from this input receiving circuit are input through the input port, and initialization is performed by a reset signal. a power supply control unit including a microprocessor that outputs a clear signal when the initialization is completed, and outputs a command signal to the lower-order device and a status report signal to the external device via the output port; an output circuit that outputs a signal from to the lower device; a reset circuit that outputs the reset signal when the power is turned on and when a reset request signal is input;
a logic circuit that outputs a signal to the output circuit when there is the reset signal and the clear signal; and a logic circuit that outputs a signal to the output circuit when there is the command signal to turn off the power; A power supply control circuit comprising: a delay circuit that outputs a request signal and stops its operation in response to a disconnection command signal to the lower device.