JP3466240B2 - Power control circuit - 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 control circuit for controlling power on / off. In low-priced range computer devices and electronic devices, switch on, external interface, built-in calendar mechanism, and UPS (uninterruptible power supply) to turn on the device or device. And controlling the disconnection is done. AC power control circuit
There is one that operates when power is supplied and has a dedicated microprocessor for backing up memory information with a battery even when AC power is not supplied, and senses each related signal to control the power. In the low price range targeted by the present application, it is desired to easily control all such memory information without holding it.

[0002]

2. Description of the Related Art In the case of a conventional lock type power switch and a power control circuit which controls the power by a PWR-OFF request (power OFF request) from software, etc., the power switch is in a closed state with a standby flag. The control that the power is not turned on is widely used. In addition, the power supply control circuit that has a battery holds the standby flag in the battery so that it can maintain the standby state even if the power is restored and the power is restored. The control is such that the power is not turned on when in the standby state and is turned on when not in the standby state.

[0003]

In recent years, with the purpose of continuing processing to the control stop point even if a power failure occurs, the UP
Increasingly connecting S. If the UPS is connected to the power supply side of the device and there is a power failure, the software processes to the stop point and then disconnects the power supply. After that, when the power is restored and the power is automatically turned on again, there is a problem in that the power control circuit becomes complicated unless the control is performed with a plurality of flags.

The calendar I also has a function of automatically turning on the power when the power-on time comes.
This is achieved by using the C alarm output. At this time, if the power is turned on after the power is restored even when the power is on for a power failure, a circuit for latching and storing the calendar IC alarm output even during a power failure is required. There was a problem that it became complicated.

The present invention solves these problems.
Regardless of whether UPS is connected or not, a control circuit that automatically returns to the operating state before the power failure even if there is a power failure / power recovery, and a control circuit that powers on after the power recovery even if the calendar power-on time comes during the power failure The purpose is to realize and with a simple circuit and software processing.

[0006]

FIG. 1 is a block diagram showing the principle of the present invention. In FIG. 1, the control circuit 1 is turned on by a PWR-OFF request signal from a device that supplies power,
When the closing trigger signal from the lock type power switch 2 or the closing request signal from the calendar mechanism 3 is turned on
It has a standby flag 11 which is a flag with power backup held in FF, and the standby flag 1
When 1 is ON, the power supply is suppressed even if the power is restored after a power failure after being in a standby state, or when it is OFF and the UPS4 that supplies power during a power failure (or UPS4) Is always ON when not connected to the power supply side), PWR- when AC power is being supplied and the closing trigger signal from the lock power switch 2 is ON.
For example, an ON signal is sent to turn on the power to the apparatus again.

[0007]

As shown in FIG. 1, according to the present invention, when the standby flag 11 is ON, the control circuit 1 prevents the power supply from being turned on again even if the power is restored after a power failure in the standby state. When the medium flag 11 is OFF, the UPS 4 that supplies power during a power failure to the device is not performing a power failure (or is always ON when the UPS 4 is not connected to the power supply side), the AC power is being supplied, and PW when the closing trigger signal from the lock type power switch 2 is ON
PWR-OFF from the power supply device, which is configured by sending the R-ON signal and turning on the power to the device again.
When a request signal is input and the standby flag 11 is turned on, the calendar mechanism 3 is further instructed only when a power failure occurs, and after a predetermined time has elapsed, an ON signal is supplied to the standby flag 11 to reset it to OFF. When power is restored after a power failure by the circuit 1, a PWR-ON signal is sent to turn on the power again.

Further, in response to the standby flag 11 being reset to OFF by the power-on request signal output when the calendar mechanism 3 reaches the preset power-on time, the control circuit 1 controls the power-on time. When power is being supplied, a PWR-ON signal is sent immediately, while
When the power is turned on during a power failure, the PWR-ON signal is automatically transmitted after the power is restored.

Therefore, regardless of whether or not the UPS 4 is connected, the control circuit 1 that automatically restores the operation state before the power failure even when the power is restored after the power failure, and after the power is restored even if the calendar input time comes during the power failure. The control circuit 1 for turning on the power can be realized with a simple circuit configuration and a simple software process.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, FIG. 1 will be described. In FIG. 1, the control circuit 1 is a circuit that sends a PWR-ON signal to the power supply circuit 5 to turn on the power to the device, or sends a PWR-OFF signal to turn off the power to the device. Therefore, the standby flag 11 and the logic circuit in FIG. 2 are included.

The lock-type power switch 2 is a manual lock-type switch that turns on the power of the apparatus, and can store either the power-on state or the power-off state even when a power failure occurs. Therefore, even if the power switch is restored after a power failure, it is possible to capture the previous state of the power switch.

The calendar mechanism 3 sends a pulse signal (power-on request signal) at a set time. The calendar mechanism 3 operates even during a power failure and sends a predetermined pulse signal (for example, a pulse signal of 1 μ / s) only once at a set time, and stores it even in the event of a power failure. It does not have the function of sending again after power recovery. Therefore, according to the present invention, the pulse signal (power-on request signal) sent from the calendar mechanism 3 is indicated by O in FIG.
F constituting the in-staying flag 11 via the R circuit 19
The standby flag 11 is input to the reset terminal R of F to be reset to OFF and stored (described later with reference to FIGS. 4 to 9).

UPS4 is an uninterruptible power supply,
When the C input has a power failure, an AC power supply is generated from a built-in battery and supplied to the power supply circuit 5 as an AC input.

The power supply circuit 5 generates and supplies a power supply (for example, a DC power supply) required by a device serving as a load based on an AC input. The external enable switch 6 is a switch that sets whether or not power can be turned on by an external turn-on request signal from the outside.

The device is a device such as a computer system to which power is supplied from the power supply circuit 5. When the lock-type power switch 2 is pressed down, the software performs various processing such as saving data to cut off the power, and then the PWR-OFF request signal from the software shown in FIG. FF set terminal S
To set to ON (standby state) (Fig. 4
From FIG. 9).

Next, the configuration and operation of the embodiment of the present invention will be sequentially described in detail with reference to FIGS. FIG. 2 shows a control circuit configuration diagram of an embodiment of the present invention. This is
3 is a specific circuit example of the control circuit 1 of FIG. Here, OR represents an OR circuit (logical sum circuit), AND represents an AND circuit (logical product circuit), FF represents a flip-flop, and NOT represents a NOT circuit (negative circuit, inverting circuit). Further, the circuit of the shaded portion is a circuit that operates on a battery (also operates during a power failure), and otherwise operates by a constant power supply (not operating during a power failure). Therefore, even during a power failure, the on-standby flag 11 is always in the operating state and can always maintain the standby state. If the circuit of the shaded portion is constructed by a CMOS circuit, it can be realized at 1 mA or less, battery backup can be easily performed, the cost can be reduced, and the function intended by the present invention can be realized.

In FIG. 2, the signals for control are as follows from the top. The "external power-on request signal" is a signal that externally issues a power-on instruction when the device is in a standby state. The apparatus is equipped with a switch, and the control circuit 1 has a "switch position is an external enable state signal" indicating an external closing instruction permission position by the external enable switch 6 and a "switch position when the switch is manually operated". A closing trigger signal from the switch is supplied.

The "AC power supply in-progress signal 2" is a signal indicating that the AC input is being supplied, and the time constant by the resistor and the capacitor from the power supply being supplied when the AC input is being supplied. This is a signal generated from the circuit.
The "AC power supplying signal 1" asserts earlier than the "AC power supplying signal 2".

The "* power failure signal" (* represents negative logic, the same applies hereinafter) is U when the UPS 4 is externally connected.
The signal is supplied from PS4 as a signal indicating a power failure period. Here, it is expressed by negative logic, and since the AC input is backed up from the UPS 4 during the power failure period, it is a signal for controlling so that the power is not turned on by the closing request signal or the external closing request signal from the calendar mechanism 3. .

"PWR-OFF request signal from software"
Is a power-off instruction issued from the software after the software of the apparatus performs a shutdown process and enters a normal stop state. When the normal lock-type power switch 2 is turned from the ON state to the OFF state, the interrupt is notified to the software, the software performs the shutdown process, and sends the PWR-OFF request signal from the software. Also, U
Even when the UPS has a power failure in the connected state of the PS4 and the software has an interrupt in a state in which backup cannot be performed any more, the software performs a shutdown process and sends a PWR-OFF request signal from the software.

The "pulse signal from the calendar" is a power-on instruction output from the calendar mechanism 3. The calendar mechanism 3 can set the current time and the power-on time from software, and has a comparison circuit in the calendar mechanism 3, and only 1 μsec of time is required when the current time and the power-on time become equal. Generate a pulse signal. Calendar mechanism 3
Generates a pulse signal of 1 μs even when the AC input is not supplied because it operates on a battery, but the circuit that holds this pulse signal until the AC input is restored is There is no.

The "power-on result signal" is a signal indicating that the power output from the power circuit 5 is completely turned on after the power is turned on by the instruction of the control circuit 1. The "forced PWR-OFF request signal from the outside" is a forced power off instruction from the external interface.

Next, the operation of the control circuit 1 shown in FIG. 2 will be sequentially and specifically described with reference to FIGS. FIG. 3 shows a time chart (No. 1) of the present invention. This is the case where the power is turned on by the closing trigger signal, the external closing request signal, and the * power failure signal.

In FIG. 3, the switch is turned on. This is because the closing trigger signal from the switch is O
When it becomes N, the PWR-ON signal flag 16 turns ON.
Then, the PWR-ON signal is sent to turn on the power (OR circuit 15 and FF set in FIG. 2). That is, if the AC input is supplied, the closing trigger signal is turned on and the PWR is turned on.
-ON signal is transmitted.

The input is made by an external input signal. When the switch position of the external enable switch 6 is the external enable state signal (when the switch position is in the openable state), the PWR-ON signal flag 16 is turned ON when the external close request signal is turned ON. , PWR
-ON signal is sent to turn on the power (set of AND circuit 12, OR circuit 15 and FF in FIG. 2). That is, if the AC input is supplied and the switch position of the external enable switch 6 is in the openable state, the external close request signal is turned ON.
Then, the PWR-ON signal is transmitted.

When a power failure / recovery occurs with UPS, restores by the signal of UPS. This is U when the switch position of the external enable switch 6 is the external enable state signal (when the switch position is in the closeable state).
The * power failure signal from PS4 turns ON (AC input is supplied), PWR-ON signal flag 16 turns ON, and PW
An R-ON signal is sent to turn on the power (AND circuit 14, OR circuit 15, FF set in FIG. 2).

The power is turned on in the above cases (see, in the state transition diagrams of FIGS. 7 and 8).
FIG. 4 shows a time chart (2) of the present invention. This is the pulse signal from the calendar, the AC when power is restored.
This is a case where the power is turned on or off by the in-supply signal 2.

In FIG. 4, after the power is restored, the power is turned on by the instruction from the calendar and the power is turned on. this is,
After a power failure and power recovery, the PWR-ON signal flag 16 is turned ON by the pulse signal from the calendar mechanism 3, and the PWR-ON signal is sent to turn on the power (OR circuit 19 in FIG. 2, standby flag 11). FF of OF
F, NOT circuit 13, AND circuit 14, OR15, FF
Set). That is, the standby flag 11 is turned off by the pulse signal from the calendar mechanism 3, the AC power supply signal 2 is turned on, and the * power failure signal is turned on.
The WR-ON signal is transmitted.

When a power failure / power recovery occurs during power-on without UPS, is turned on by power recovery and power is turned on. This is because when the power is restored after a power failure, the standby flag 11 is set to OF.
Since it was F, the PWR-ON signal flag 16 is turned ON when the power supply signal 2 is turned ON, and the PWR-ON signal flag 16 is turned ON.
-ON signal is sent to turn on the power (OFF of the standby flag 11 in FIG. 2, NOT circuit 13, AND circuit 1
4, OR circuit 15, FF set). That is, if the standby flag 11 is OFF, PWR-
It sends an ON signal.

'Is not turned on at the time of power recovery when a power failure / power recovery occurs during standby. This is because the standby flag 11 was ON when the power was restored after a power failure, so even if the power supply signal 2 is ON, PWR-ON
Do not turn on the power without turning on the signal flag 16 (see FIG. 2).
ON of the flag 11 during standby, NOT circuit 13, A
ND circuit 14, OR circuit 15, and FF cannot be set). That is, if the standby flag 11 is ON,
Do not send PWR-ON signal when power is restored.

The power is turned on at the time of the above, and the power is not turned on at the time of '(see,' in the state transition diagrams of FIGS. 7 and 8). FIG. 5 shows a time chart (3) of the present invention. This is the case where the power is turned on when there is a power failure / power recovery with UPS.

In FIG. 5, (1) indicates P from the software.
When the power is restored earlier than WR-OFF, the power is restored by the trigger of. This is because a power failure occurred and the UPS4 signal *
After becoming FF (active), PWR- from software
When power is restored earlier than OFF, PW from the software
The standby flag 11 is turned on by R-OFF and the standby flag 11 is turned off by a pulse signal from the calendar 5 seconds after the software starts the calendar mechanism 3 according to the flowchart of FIG. Then, when the in-standby flag 11 of (1) in the figure is turned off, the PWR-ON signal flag 16 is turned on, and the PWR-ON signal is transmitted and turned on. That is, the standby flag 11 is turned on by the PWR-OFF request signal from the software, and the standby flag 11 is turned on by the pulse signal from the calendar after 5 seconds.
Is turned off, and the power is turned on in (1).

(2) is PWR-OFF from the calendar
When the power is restored earlier than, the power is restored by the trigger. This is because when a power failure occurs and power is restored earlier than the pulse signal from the calendar, the standby flag 11 is turned off from ON after waiting for the pulse signal from the calendar, and the PWR-ON signal flag 16 is turned on because of (2). And PWR-O
Send N signal and turn on. That is, when the power is restored earlier than the calendar setting time, the standby flag 11 is turned off by the pulse signal from the K calendar, and the power is turned on.

In (3), when the power is restored after 5 seconds, the power is restored by the trigger of. This is a power outage and 5 from the calendar
Standby flag 11 by the pulse signal after a lapse of seconds
Since it is OFF, when the power is restored, the PWR-ON signal flag 16 is turned ON by using the * power failure signal as a trigger, and the PWR-ON signal is sent and turned on. That is, since the standby flag 11 is OFF when the power is restored after 5 seconds, the power is turned on with the power restoration as a trigger.

The above (1), (2) and (3)
At that time, the power is turned on (see in the state transition diagrams of FIGS. 7 and 8). FIG. 6 shows a time chart (No. 4) of the invention. This is a calendar input. Here, the in-standby flag 11 is turned on by the PWR-OFF request signal from the software to enter the standby state.

In FIG. 6, when power is restored before the elapse of 5 seconds, the standby flag 11 is turned off by the pulse signal from the calendar after the elapse of 5 seconds, and the PWR-O
The N signal flag 16 is turned on, and the PWR-ON signal is transmitted and turned on.

Since the standby flag 11 is turned off after 5 seconds have elapsed, PWR is triggered by power recovery.
The -ON signal flag 16 is turned ON, and the PWR-ON signal is transmitted and turned on.

When the power is restored 5 seconds before, the power is turned on with the pulse signal from the calendar after 5 seconds as a trigger, and when the power is restored after 5 seconds after the power is restored, the power is triggered. Throw in.

FIG. 7 shows a state transition diagram (UPS unconnected) of the present invention. here,,,,,,',
Corresponds to the same one in FIGS. 3 to 6 already described. In this embodiment, the transition of the thick line is particularly indicated by the control circuit 1 of FIG.
It was made possible by.

FIG. 8 shows a state transition diagram (UPS connection) of the present invention. Here ,,,,,,, correspond to the same ones in FIGS. 3 to 6 described above. In the present embodiment, especially the transition of the bold line is made possible by the control circuit 1 of FIG.

FIG. 9 shows an operation explanatory diagram of the present invention. This is performed by software in the device to which power is supplied, and performs different processing depending on a power failure and a switch OFF. This will be described below.

In FIG. 9, S3 starts the shutdown process. This is because the software is S1 power failure (U
The shutdown process is started when the power failure is notified from PS4) or when the switch of S2 is turned off.

At S4, a normal shutdown process is performed. In this case, before the power is turned off, under the condition that the power is supplied from the UPS 4, the software performs various processes such as saving data.

In step S5, it is determined whether the disconnection is due to a power failure. YE
In the case of S, it was determined that the disconnection was due to a power failure, so S6,
Execute S7. On the other hand, if NO, switch OF
Since it is determined that the power is cut by F, a power-off request is issued to the hardware in S7 to turn off the power.

In step S6, the calendar PWR-ON time is set to 5 seconds. The calendar mechanism 3 which has been set and activated for 5 seconds outputs a pulse signal after 5 seconds, and the standby flag 11 is turned on in response to the pulse signal from the calendar as shown in ″ of FIG. 5 described above. Reset to OFF.
Then, in S7, a power-off request is issued to the hardware to turn off the power. In this S6, the standby flag 11 is set to 0.
When power is restored in response to the reset to FF,
The power can be automatically turned on again in the case of (2) or (3) in FIG. 5 described above.

On the other hand, when the switch of S2 is OFF,
The standby flag 11 is ON, and the above-described FIG.
When the power is restored, it will not turn on.
Based on the above, under the simple circuit configuration of FIG. 2, the software on the side of the device to which power is supplied sets the calendar mechanism 3 for 5 seconds to start up after shutdown processing at the time of power failure, and is sent after 5 seconds. The standby flag 11 is reset to OFF by the pulse signal. On the other hand, when the switch is OFF, nothing is done and the standby flag 11 is kept ON. Then, at the time of a power failure in which the standby flag 11 has been reset to OFF at the time of power restoration, the power is automatically turned on again (″ in FIG. 5, (2) or (3)), while The power is not automatically turned on again when the switch is turned off while the standby flag 11 is kept set to ON at the time of power restoration ('in FIG. 4). This made it possible to achieve the following objectives with a simple circuit: -When the power is restored, the power is automatically turned on again when the power is restored, and-When the switch is turned off, the power is not automatically turned on again.

[0047]

As described above, according to the present invention,
A control circuit 1 that automatically restores the operation state before the power failure even when the power is restored after the power failure, regardless of whether the UPS 4 is connected or not.
The control circuit 1 that turns on the power after the power is restored even if the calendar turn-on time comes during a power failure can be realized with a simple circuit configuration and a simple software process. With these,
Regardless of whether UPS is connected or not, there is a function that can restore the original power state when power is restored even if there is a power failure, and a function that can power on even if power is restored after the calendar power-on time has been exceeded. It can be realized by an extremely simple circuit.

[Brief description of drawings]

FIG. 1 is a principle configuration diagram of the present invention.

FIG. 2 is a configuration diagram of a control circuit according to an embodiment of the present invention.

FIG. 3 is a time chart (1) of the present invention.

FIG. 4 is a time chart (No. 2) of the invention.

FIG. 5 is a time chart (No. 3) of the invention.

FIG. 6 is a time chart (No. 4) of the invention.

FIG. 7 is a state transition diagram of the present invention (when UPS is not connected).

FIG. 8 is a state transition diagram (during UPS connection) of the present invention.

FIG. 9 is an operation explanatory diagram of the present invention.

[Explanation of symbols]

1: Control circuit 11: Standby flag 12, 14, 22: AND circuit 13, 20: NOT circuit 15, 19, 21: OR circuit 16: PWR-ON signal flag FF: Flip-flop circuit 2: Lock type power switch 3: Calendar mechanism 4: UPS (Uninterruptible power supply) 5: Power circuit 6: External switch

Claims (2)

(57) [Claims] 1. A power control circuit for controlling the on / off of the power source, and turned on by the power supply disconnection request signal from the power supply supplying apparatus, power on the basis of the closing trigger signal on from locking the power switch (2) Power on output when turned on
The standby signal (11) with power backup that is kept off by the result signal or the pulse signal from the calendar mechanism (3), and when the standby flag (11) is on, the power is restored as a standby state after a power failure. Even if the power is turned off again, while the power is off, the UPS is supplying power during a power outage (UPS) (4) during non-power outage and AC power is being supplied. And a control circuit (1) for transmitting a power-on signal to turn on the power to the device again when the power-on trigger signal from the lock-type power switch (2) is on. When the standby request flag (11) is turned on by inputting the disconnection request signal, the calendar mechanism (3) is further instructed only when a power failure occurs, and the on signal is turned on after a predetermined time has elapsed. By flag (1
It is characterized in that the power is supplied to 1), reset to OFF, and set to a state in which a power-on signal can be sent when power is restored, and the power is turned on again by the control circuit (1) when power is restored. Power supply control circuit. 2. The control circuit in response to the standby flag (11) being reset to OFF by a closing request signal output when the calendar mechanism (3) reaches a preset power-on time. (1) Immediately send a power-on signal when the power-on time is being supplied, and automatically send a power-on signal after power recovery when the power-on time is during a power failure. The power supply control circuit according to claim 1, wherein: