JPH01187618A - Power failure storage device - Google Patents

Abstract

PURPOSE:To make the automatic switch-on of a power supply possible only at the time of the restoration of the power supply after the power failure after a power switch is pushed down by storing previously that the power switch was pushed down and the power failure occurred, and instructing the automatic switch-on of the power supply only when the power supply stops after the power switch is pushed down. CONSTITUTION:When a power supply ON switch is pushed down, a power supply ON signal is inputted to a flip flop 6 from a power supply control circuit 1 so as to store that the power supply ON switch was pushed down, and this state is outputted to an AND gate 8. Afterward, when the power supply stops, a power failure signal is inputted to the flip flop 7 from the power supply control circuit 5 so as to store the occurrence of the power failure, and this state is outputted to the gate 8. The gate 8 takes the logical product of the flip flop 6 and the flip flop 7, and only when the power failure occurs after the power supply ON switch is pushed down, it outputs a signal to instruct the power supply control circuit 1 to switch on the power supply at the time of the restoration of the power failure. Thus, the automatic switch-on of the power supply can be performed only at the time of the restoration after the power failure after the power switch is pushed down.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to power control of a computer system during a power outage.

[Conventional technology]

As described in Japanese Unexamined Patent Publication No. 57-199427, conventional devices turn on the power when power is restored after a power outage. There was no consideration given to the power supply, and the problem was that the power would not be turned on when power was restored, regardless of the state of the device before the power outage.

The purpose of the present invention is to remember that the power switch has been pressed and that a power outage has occurred, and to automatically turn on the power only when there is a power outage after pressing the power switch. This is accomplished by a power outage storage device that directs.

[For production]

When the power switch is pressed, this is memorized, and if a power outage occurs thereafter, this is memorized. Automatic power-on is instructed only when the power is restored and both the memory of pressing the power switch and the memory of the occurrence of a power outage are displayed. This makes it possible to automatically turn on the power only when power is restored after a power outage after pressing the power switch.

C Example] An embodiment of the present invention will be described below with reference to the drawings.

In Figure 1, 1 is a power control circuit that controls the output of power input from the power supply circuit to the system, 2 is a self-holding relay that remembers when the power switch is pressed, and 3 is a self-holding type that remembers the occurrence of a power outage. Relay 4 is a gate that takes the AND of the output of relay 2 and the output of relay 3. Figure 2 is the first
5 is a time chart showing waveforms at various parts in the figure.

When the power on switch is pressed, a power on signal is input from the power control circuit 1 to the relay 2, which stores the pressing of the power on switch and outputs the state to the gate 4. If a power outage occurs after this, a power outage signal is input from the power supply control circuit 1 to the relay 3, which stores the power outage occurrence, and transmits the state to the gate 4.
Output to.

Gate 4 takes the AND of relays 2 and 3.

Only when a power outage occurs after pressing the power on switch.

A signal is output to instruct the power supply control circuit 1 to turn on the power when the power is restored. When the power is restored, the power supply control circuit 1 turns on the power if the output of the gate 4 is on. When the power off switch is pressed, the power control circuit 1 activates the relay 2. Reset relay 3.

Next, an embodiment in which a flip-flop operated by battery backup is used as a means for memorizing the pressing of the power switch and memorizing the occurrence of a power outage will be described with reference to FIGS. 3 and 4.

In FIG. 3, 5 is a power supply control circuit, 6 is a flip-flop that remembers the pressing of the power switch, 7 is a flip-flop that remembers the occurrence of a power outage, and 8 is the AND of the output of flip-flop 6 and the output of flip-flop 7. This is a gate that takes FIG. 4 is a time chart showing waveforms at various parts in FIG.

When the power-on switch is pressed, a power-on signal is input from the power control circuit 1 to the flip-flop 6, which stores the pressing of the power-on switch and outputs the state to the gate 8. When a power outage occurs thereafter, a power outage signal is input from the power supply control circuit 4 to the flip-flop 7, the occurrence of the power outage is stored, and the state is output to the gate 8. The gate 8 takes the AND of the flip-flop 6 and the flip-flop 7, and outputs a signal instructing the power supply control circuit 1 to turn on the power when the power is restored only when a power outage occurs after pressing the power on switch. When the power is restored, the power supply control circuit 5 turns on the power if the output of the gate 8 is on. When the power off switch is pressed, the power supply control circuit 1 resets the flip-flop 6 and the flip-flop 7.

〔Effect of the invention〕

According to the present invention, the power can be automatically turned on only when power is restored after a power outage after pressing the power switch.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of an embodiment of the present invention, Fig. 2 is an operation-related diagram showing its operation, Fig. 3 is a circuit diagram of an embodiment of the invention, and Fig. 4 is a diagram showing its operation. It is an operation|movement related diagram. 2...Self-holding relay, 3...Self-holding relay. 4... AND gate, 1... Power supply control circuit, 5...
・Power control circuit, 6... flip-flop, 7...
Flip-flop, 8...AND gate. i muscle 20 labor

Claims (1)

[Claims] 1. A means for remembering that the power switch has been pressed;
1. A power outage memory device, comprising means for storing information that a power outage has occurred, thereby instructing automatic power-on only when power is restored in the event of a power outage after pressing a power switch.