JP3171099B2 - Computer power on / off 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 power on / off control method, and more particularly to a computer power on / off control method.

[0002]

2. Description of the Related Art Heretofore, this type of computer power on / off control system has been used for the purpose of eliminating a factor that hinders power-on (that is, power-on).

For example, Japanese Unexamined Patent Publication No. 58-116925 discloses a "remote power-on system". When an operation mode in which power is turned on / off by remote control is set, a local power-on operation by an operator and an automatic power-on operation are performed. A technique is described in which power-on control can be performed from any of remote control by control.

[0004]

The first of the prior arts
The problem is that it lacks security. For example, if an operator forgets to switch to the local control mode when performing maintenance and inspection of a computer, and performs maintenance and inspection work with only the local power switch turned off while the remote control mode is set. The power may be suddenly turned on by remote control from automatic power control.

[0005] The reason is that, in order to give priority to power-on, power-on control is performed under the logical OR condition of local power-on and remote control.

[0006] The second problem is that it lacks reliability. For example, if an accident such as a disconnection or short circuit occurs in the signal line that governs remote control and the system continues to issue a power-on request, the power must be turned off even if a local power switch issues a power-off request. Can not be done.

The reason is that, in order to give priority to the power-on, the power-on control is performed under the logical OR condition of the local power-on and the remote control.

[0008]

The computer power on / off control method of the present invention is based on a combination of an external output on / off request condition and a power switch setting condition.
Determine the output on / off of the power supply. In particular,
On / off control circuit (5 in FIG. 1) and self-holding circuit (6 in FIG. 1) for holding external output on / off request conditions
And

It is also characterized by a remote / local switch (7 in FIG. 1).

In the present invention, when the output of the power supply device is turned on, the on / off control circuit takes the logical product of the externally required on condition and the on setting condition of the power switch. And outputs a control signal to turn on. Even when the output is off, the on / off control circuit takes the logical sum of the off request condition from the outside and the off setting condition of the power switch, and outputs a control signal to turn off the output immediately if the result is true. Therefore, even if the computer is remotely controlled, turning off the power switch
Ensures that the power does not turn on. Also, if an error occurs in the remote control signal and it is not possible to cancel the external power-on request, turning off the power switch will
Power supply output can be reliably turned off.

The power supply output on / off request from the outside is received as a pulse signal, and the self-held output on / off request condition is inverted. Therefore, even when the signal line is abnormal or the master station goes down, the power on / off of the computer on the slave station side is not affected. Further, when the remote / local changeover switch is switched to the local control mode, it is not affected by an external output on / off request condition.

[0012]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. Referring to FIG. 1, in a first embodiment of the present invention, a computer 1
Indicates that the CPU 2 and the power supply 3 are locally turned on / off.
A power switch 4 for setting an off condition, an on / off control circuit 5 for determining output on / off of the power supply, a self-holding circuit 6 for holding a power on / off request condition by remote control, and a remote control Remote / local switch 7 for switching between local control and local control
And The power supply device 3 supplies an output 8 obtained by converting the AC input 15 to the CPU 2, and outputs an on / off state signal 14. The on / off control circuit 5 receives the setting condition 9 of the power switch 4 and the on / off request condition 13 via the self-holding circuit 6 and the remote / local changeover switch 7, and outputs the on / off control signal 10. Output.

Next, the operation of the first embodiment of the present invention will be described. The power supply 3 outputs an on / off control signal 1
A 0 controls whether the output 8 is turned on or off. The ON / OFF state signal 14 indicates whether the power supply device 3 is ON / OFF.
Indicates the off state. The self-holding circuit 6 inverts the held on / off request condition 12 from on to off or from off to on each time the pulsed on / off request signal 11 is given. At this time, when the on / off request signal 11 is given by a status signal instead of a pulse signal, the self / hold circuit 6 is bypassed and the remote /
Direct input to the local changeover switch 7.

When the remote / local switch 7 is set to the remote side, the on / off request condition 12 is turned on / off.
When input to the OFF control circuit 5 and set to the local side, both the ON request and the OFF request are invalidated regardless of the ON / OFF request condition 12. The on / off control circuit 5 determines on / off of the power output on the basis of a combination of an on / off request condition 13 which is an output of the remote / local switch 7 and a setting condition 9 of the power switch 4, and turns on / off. / Off control signal 10 is output.

FIG. 2 is a circuit diagram showing an embodiment of the first embodiment of the present invention shown in FIG. In the figure, SW1
Reference numeral 21 corresponds to the power switch 4 in FIG. 1, AND 28 corresponds to the on / off control circuit 5 in FIG. 1, a combination of SW2 22 and NAND 27 corresponds to the remote / local switch 7 in FIG. F26 and SW3 23
Corresponds to the self-holding circuit 6 in FIG. Further, an input buffer 24 for inputting the on / off request signal 11 to the computer 1 and an output buffer 29 for outputting the on / off state signal 14 are provided.

The power supply 3 is turned on when the CNT input is set to logic "1", and is turned off when the CNT input is set to logic "0". SW1 21 becomes logic "1" when it is set to the ON side, that is, when the power is turned on, and becomes logic "0" when it is set to the OFF side, that is, when the power is turned off. SW2 22 becomes logic "1" when set to the R side, that is, the remote control mode,
When set to the L side, that is, the local control mode,
It becomes logic "0". SW3 23 supplies the output of toggle F / F 26 to NAND 27 when it is set to the P side, that is, the pulse signal mode, and outputs the output of input buffer 24 directly to NAND 27 when it is set to the S side, that is, the status signal mode. give.

At the rising edge of the on / off request signal 11, the holding state of the toggle F / F 26 is inverted. When the on / off request signal 11 is a status signal, the on / off request signal 11 is given by a logic "0" at the time of an on request and by a logic "1" at the time of an off request. The output of the toggle F / F 26 is also logic "0" when an on request is made, and logic "1" when an off request is made.

When the SW2 22 is set to the L side, the output of the NAND 27 becomes logic "1" regardless of the other input. Therefore, AND28 is S
The setting condition of W121 is output as it is. That is, S
When W1 21 is ON, the output of the AND 28 becomes logic "1", so that the power supply 3 is turned ON. SW1 2
When 1 is OFF, the output of the AND 28 becomes logic “0”, and the power supply 3 is turned off.

SW2 22 is set to the R side and SW3
When 23 is on the P side, the output of AND 28 is a toggle F / F
The output of 26 is inverted by the NAND 27, and the result is obtained by taking the logical product with the setting condition of SW1 21. SW2 22 is R
When the SW3 23 is set to the S side and the output of the input buffer 24 and the setting condition of the SW1 21 are logically ANDed, the result is obtained.

Further, the operation of the above embodiment will be described in detail with reference to FIG. When SW2 22 is on the L side, S
While W1 21 is OFF, DC output 33 is off,
When the SW1 21 is turned on, the DC output 33 is turned on regardless of the on / off request signal 11 from the outside. SW2
When the switch 22 is set to the R side, even if the switch SW21 is turned on, the DC output 33 is not turned on unless an external power-on request is received. Even if the SW 121 is ON, the DC output 33 is turned off if there is an external power-off request.

At this time, when the SW3 23 is on the P side, the DC output 33 is turned on / off at the timing of the rising of the on / off request signal 11 from the outside.
When SW3 23 is on the S side, SW1 21
Is ON and the DC output 33 is ON only when the ON / OFF request signal 11 from the outside is ON, and when the SW122 is OFF or the ON / OFF request signal 11 from the outside is OFF, the DC output 33 is OFF. The on / off state signal 14 is D
The same waveform as the C output 33 is output.

In this embodiment, a DC power supply is used to convert an AC input into a DC output. Therefore, when the AC input is turned off, the DC output 33 is output irrespective of the power supply on / off request signal 11 from the SW 122 and the outside. Is turned off, but the present invention is not limited to a DC power supply.

Next, a second embodiment of the present invention will be described with reference to the drawings. Referring to FIG. 4, the second embodiment of the present invention is different from the first embodiment in that the second embodiment has a means for turning on the initial value of self-holding circuit 6 shown in FIG.

Next, a third embodiment of the present invention will be described with reference to the drawings. Referring to FIG. 5, the third embodiment of the present invention is different in that the power supply device 3 shown in FIGS. 1 and 2 converts a DC input to a DC output.

Next, a fourth embodiment of the present invention will be described with reference to the drawings. Referring to FIG. 6, in the fourth embodiment of the present invention, the output of self-holding circuit 6 and the output of power switch 4 are input to remote / local switch 7 shown in FIG. Is provided to the on / off control circuit 5. At the time of setting on the remote side, a result obtained by taking a combination condition of the output of the self-holding circuit 6 and the output of the power switch 4 is output, and at the time of setting on the local side, the output of the power switch 4 is directly output.

[0026]

The first effect of the present invention is that the safety when remotely controlled is improved. For this reason,
The present invention can also be applied to a system that remotely manages many devices. The reason is that if the local power switch is turned off or the remote / local switch is switched to the local side, the remote control will not be affected even if it remains connected to the remote control system. is there.

The second effect is that the power can be surely turned off at any time, and the reliability is improved since the signal is not affected even if a failure occurs in the signal line for remote control or the master station. The reason is that the output of the power supply can be turned off by always turning off the local power switch in the remote control mode or the local control mode. This is because a pulse signal is received only when the state changes from off to on or from on to off.

[Brief description of the drawings]

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

FIG. 2 is a circuit diagram showing an example according to the first embodiment of the present invention.

FIG. 3 is a waveform chart for explaining the operation of the embodiment of the present invention shown in FIG. 2;

FIG. 4 is a block diagram showing a second embodiment of the present invention.

FIG. 5 is a block diagram showing a third embodiment of the present invention.

FIG. 6 is a block diagram showing a fourth embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Computer 2 CPU 3 Power supply device 4 Power switch 5 On / off control circuit 6 Self-holding circuit 7 Remote / local changeover switch 8 Power supply output 9 Power switch on / off setting state 10 On / off control signal 11 External ON / OFF request signal 12 Self-held ON / OFF request signal 13 ON / OFF request signal according to remote / local operation mode 14 ON / OFF state signal 15 AC input 21 SW1 (power switch) 22 SW2 (remote / Local switch) 23 SW3 (Pulse / Status switch) 24 Input buffer 26 Toggle F / F 27 NAND circuit 28 AND circuit 29 Output buffer 33 DC output 40 DC input

Claims (5)

(57) [Claims] 1. A pulse signal from the outside of a computer.
Output on / off requirements
Self holding means for inverting the state of the output on / off requirement that holds the receive scan signals, ON side / OF
Power supply built into the computer according to the settings on the F side
Turn the local power switch on or off
Switch and the setting conditions of the power switch are on, and
Only when the required output on / off requirement is on
Turn on the output of the power supply and set the power switch
Output on / off request when condition is off or held
Turns off the power supply output when any of the conditions are off.
Power on / off control scheme of the computer that is characterized by Ru and an subjecting ON / OFF control means. 2. The computer power on / off control method according to claim 1, further comprising means for outputting the output on / off state of the power supply to an external device, and externally turning on / off the output of the computer power supply. A power on / off control method for a computer, characterized in that a pulse signal is given as necessary while checking the state to control the output on / off of the power supply device. 3. A controller corresponding to the ON / OFF side setting.
Turn on or off the setting conditions of the power supply built into the computer.
Local power switch and external computer
Status signal indicating output on / off request condition from
Directly input and the power switch setting condition is on,
The output on / off request condition by the status signal is
Turns on the output of the power supply only when the
The power switch setting condition is off or the status
Either the output on / off request condition by the signal is off
An on / off control means for turning off the output of the power supply in case
And a power on / off control method for a computer. 4. A power on / off control scheme of the computer according to claim 1, 2 or 3, provided with a remote / local changeover switch, the output ON / OFF request by the signal from the outside when setting the remote side The output on / off of the power supply is determined from both the conditions and the setting conditions of the power switch. When the output is set to the local side, regardless of the output on / off request condition by an external signal,
A power on / off control method for a computer, characterized in that output on / off of a power supply device is determined only by a setting condition of a power switch. 5. The computer power on / off control method according to claim 1, wherein an initial state of the self-holding unit is an output on condition.