JPH07160369A - Duplex processor - Google Patents

Abstract

PURPOSE:To increase the back-up time of battery when the commercial power supply to a duplex processor is cut off. CONSTITUTION:When no power is supplied from a commercial power supply due to a power failure or another factor, the power supply is switched to the batteries B0 and B1. Thus the power is supplied to the processors P0 and P1 from the batteries B0 and B1 respectively. Then the supply of power to the processor P1 or P0 is cut off that is turned into a stand-by processor after a fixed time by a controller D1 or D0. Furthermore the frequency of the supplied clock is reduced after a fixed time in accordance with the application rate reported from the processor P0 or P1 which monitors the controller D0 or D1. Then the processing data are saved and the operation of the stand-by processor is stopped after a fixed time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for supplying a backup power source in case of a power failure of a duplexer.

[0002] The present invention relates to a duplexing processing device capable of supplying backup power from a battery for a long time.

[0003]

2. Description of the Related Art In a conventional power supply backup, when a commercial power supply is cut off, a power supply from a battery is switched to drive a processing device (NEC Technical Report Vol.
2 No. (See 1/189).

Also, as an apparatus configured to monitor the state of a power source and execute a corresponding process, Japanese Patent Laid-Open No. 63-22.
The technique disclosed in Japanese Patent No. 8311 is known.

[0005]

In such a conventional method, the power supply from the battery is limited, and when the battery voltage drops with the lapse of time, the processor is stopped and the system is restarted. It had the drawback of losing the memory information needed to start.

The present invention solves such a problem by providing an apparatus capable of supplying power from a battery for a long time when a commercial power supply is cut off and preventing loss of information on a memory. The purpose is to provide.

[0007]

SUMMARY OF THE INVENTION The present invention provides a dual processing apparatus that includes an active system, a standby system, and switching means for the standby system, and further includes a battery that serves as a sub power source when the main power source fails in a main power source. A first processing means for disconnecting the standby system when the power failure continues for the first predetermined time; and a first processing means for switching the speed of the operation clock signal to a low speed when the power failure of the main power supply continues for the second predetermined time after disconnecting the standby system. It is characterized in that it is provided with a second processing means and a third processing means for monitoring the usage limit of the battery and executing a stop processing when the usage limit approaches.

The second processing means includes means for monitoring a use state at that time and setting the low-speed clock signal according to the use state, and the first predetermined time is 5 to 5.
It is set to 20 seconds, and the second predetermined time is 10 seconds to 5 seconds.
The battery usage limit is set between minutes, and the battery usage limit is the usable time of the battery, and comprises means for monitoring the terminal voltage of the battery and means for determining the usage limit of the battery from the terminal voltage. Is desirable.

[0009]

When the power supply from the commercial power supply is cut off due to a power failure or other reasons, the power supply is switched from the active system and the standby system batteries to the standby system after a lapse of a predetermined time (for example, 10 seconds). The power consumption is reduced to ½ by stopping the power supply to the processor which becomes the above and continuing the single system operation by the active system for a predetermined time (for example, 30 seconds). Next, after a lapse of a predetermined time, the power usage rate is sent from the processor, and the clock speed is reduced according to a predetermined relationship between the usage rate and the clock frequency multiplication factor. Power is supplied, the clock frequency ratio is maximized to save the processing data, and then the operation of the standby system is stopped.

As a result, the power supply from the battery when the supply of commercial power is stopped can be extended as much as possible, and the loss of information from the memory can be prevented.

[0011]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the embodiment of the present invention.

In the embodiment of the present invention, the active system and the standby system, and the changeover switch S as a switching means for the active system and the standby system
0, S1, batteries B0, B1 serving as auxiliary power sources when the main power source fails, and controllers D0, D1.
As a feature of the present invention, the controllers D0 and D1 have a first processing means for disconnecting the standby system when the power failure of the main power source continues for a first predetermined time, and a second power failure for the main power source after disconnecting the standby system. A second processing means for switching the speed of the operation clock signal to a low speed when continuing for a time, and a third processing means for monitoring the usage limit of the battery and executing the stop processing when the usage limit approaches.

The second processing means includes means for monitoring a use state at that time and setting the low speed clock signal according to the use state, and the first predetermined time is 5 to 5 seconds.
It is set to 20 seconds, and the second predetermined time is 10 seconds to 5 seconds.
It is set in minutes, and the usage limit of batteries B0 and B1 is
Means for monitoring the terminal voltage of the batteries B0, B1, which is the usable time of the batteries B0, B1;
And a means for determining the usage limit of the batteries B0, B1 from the terminal voltage.

Next, the operation of the embodiment of the present invention thus constructed will be described.

Normally, AC100V is supplied from the commercial power supply, and the batteries B0 and B1 are charged by the output of the AC / DC conversion circuit C supplied by the commercial power supply.
The changeover switches S0 and S1 switch the power supply to the converters I0 and I1 that perform voltage conversion under the control of the controllers D0 and D1. Commercial power is supplied when the contact (1) is connected, supply is stopped when the contact (2) is connected, and the battery B0 is connected when the contact (3) is connected.
And power is supplied from B1.

The controllers D0 and D1 are changeover switches S0 and S1 according to a battery voltage, a commercial voltage, and a status display from the processing unit indicated by the processors P0 and P1.
Control each. The converters I0 and I1 supply necessary voltages to the processors P0 and P1, and the status display contents sent from the processors P0 and P1 to the controllers D0 and D1 include dual / single display and active /
A standby system display and a CPU usage rate display are included. In the active / standby system display, the system that is actually performing processing during duplication is the active system, and the system that is standing by in case of a failure is the standby system.

The operation when the commercial power supply is cut off will now be described. FIG. 2 is a flow chart showing the flow of the operation.

When the commercial power supply is cut off from the normal operation,
The voltage change is detected by the controllers D0 and D1, and the changeover switches S0 and S1 are switched to the position (3), respectively. This switched state continues until the power is cut off for 10 seconds, but if the power is restored within 3 seconds,
Changeover switches S0, S1 by the controllers D0, D1
Are returned to contact (1).

If the commercial power supply is cut off for 10 seconds or more, if the status indications sent from the processors P0 and P1 are duplicated, the power supply of the standby system processing unit is cut off. For example, if the processor P1 is a standby system, the controller D1 causes the changeover switch S1 to be in the position of the contact (2). The changeover switch S0 remains at the position of the contact (3) and continues to supply the electric power from the battery B0 for 30 seconds. As a result, the power consumption is reduced to 1/2.

When the power supply from the battery B0 has passed for 30 seconds, only the processor P0 is operating in this case. Therefore, the processor P0 sends out the usage rate of the processing device for the past one minute, and the controller D0 uses the processor P0. Send a control signal to P0 to reduce the clock speed. FIG. 3 shows the relationship between the power usage rate and the clock frequency multiplication factor.

Here, if the usage rate is 30%,
As shown in FIG. 3, the clock magnification becomes 1/2. As a result, the power consumption of the processing device made of CMOS logic becomes about 2/3. This is not 1/2 because there is a fixed power component other than CMOS. If this state continues for N minutes, the next operation is performed, but since the processing device generally has a file system on the disk, it is necessary to save the processing data to the disk in order to stop the system. Since this evacuation work cannot be stopped midway, it is necessary to perform it at high speed in preparation for power restoration, and the evacuation is performed by returning the clock magnification to "X1" shown in FIG. When the evacuation is completed, the controller D1 switches the changeover switch S1 to the contact (2) to stop the power supply from the battery B1. The elapsed time N is determined by the voltages of the batteries B0 and B1, and the controllers D0 and D1 have a built-in correspondence table of the voltages of the batteries B0 and B1 and the usable time, and N is determined by this.

[0022]

As described above, according to the present invention, when the supply of the commercial power supply is stopped during the operation of the duplexer and the power supply is switched from the battery, the power supply from the memory is enabled for a long time. It has the effect of preventing information loss.

[Brief description of drawings]

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

FIG. 2 is a flowchart showing a flow of operations in the embodiment of the present invention.

FIG. 3 is a diagram showing the contents of a table in which clock frequency multiplication factors corresponding to the usage rates of the processors in the embodiment of the present invention are recorded.

[Explanation of symbols]

 C AC / DC converter circuit B0, B1 battery R0, R1 diode D0, D1 controller I0, I1 converter P0, P1 processor S0, S1 changeover switch

Claims (5)

[Claims] 1. In a duplexer including an active system, a standby system, and switching means for the standby system, and a battery serving as a sub power source when the main power source fails, a power failure of the main power source continues for a first predetermined time. A first processing means for disconnecting the standby system, a second processing means for switching the speed of the operation clock signal to a low speed when the power failure of the main power source continues for a second predetermined time after disconnecting the standby system, and the battery And a third processing unit that executes a stop process when the usage limit of the device is approached and the usage limit approaches. 2. The duplexer according to claim 1, wherein the second processing means includes means for monitoring a use state at that time and setting the low speed clock signal according to the use state. 3. The duplexer according to claim 1, wherein the first predetermined time is set to 5 to 20 seconds and the second predetermined time is set to 10 seconds to 5 minutes. 4. The duplexer according to claim 1, wherein the use limit of the battery is a usable time of the battery. 5. The duplexer according to claim 1, further comprising means for monitoring a terminal voltage of the battery and means for determining a usage limit of the battery from the terminal voltage.