JPH0651874A - Power supply system - Google Patents

Abstract

PURPOSE:To stop supplying power from a power source circuit to an information processor when there is no input from the input device of the information processor for over a prescribed time and to save the data of a central processing unit (CPU) just before this power supply is stopped. CONSTITUTION:A timer 3 measures the lapse of a time after a time point when there is M input from an input device 1. When a count value from the timer 3 is equal to a time-out time set value from a time-out time setting register 8, a time-out signal is generated by a comparator 5 and given to a CPU 6. When the time-out signal is received from the comparator 5, the data of the CPU 6 are stored and saved in a memory 7 and next, power source OFF information is given to a power source OFF register 9 by the CPU 6. When the power source OFF information is received, this power source OFF register 9 cuts off power supplied from a power source circuit 10 to the device and the circuit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply system for supplying power to an information processing device from a power supply circuit for the information processing device.

[0002]

2. Description of the Related Art Conventionally, as a power supply system, supply of power from a power supply circuit to a data processing device and suspension of the power supply have been performed via a mechanical switch.

[0003]

However, in the conventional power supply system, when the power from the power supply circuit is supplied to the information processing device by the mechanical switch, the mechanical switch is operated to turn it off. Unless otherwise, there is a problem that power is continuously supplied from the power supply circuit to the information processing device. Further, in the conventional power supply system, when the mechanical switch is operated to be turned off to stop the power supply from the power supply circuit to the information processing device, the data of the central processing unit of the information processing device is erased. Therefore, there is a problem that the mechanical switch must be operated next to turn it on to input data again when power is supplied from the power supply circuit to the information processing apparatus.

An object of the present invention is to stop the supply of electric power from the power supply circuit to the information processing apparatus when the input from the input apparatus of the information processing apparatus has not been performed for a predetermined time or more, and to supply this electric power. An object of the present invention is to provide a power supply system capable of saving the data of the central processing unit immediately before the stop.

[0005]

According to the present invention, in an electric power supply system for supplying electric power from a power supply circuit to an information processing apparatus, the elapsed time from the time when there is an input from the input apparatus of the information processing apparatus is measured. And a predetermined time elapse determination means for generating a time-out signal when the elapsed time measured by the time measurement means reaches a predetermined time, and data of the central processing unit receiving the time-out signal from the predetermined time elapse determination means. Is stored in the memory, and a power supply stopping means for stopping the supply of power from the power supply circuit to the information processing device after the data of the central processing unit is stored in the memory by the data saving means. A power supply system is obtained.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. In FIG. 1, reference numeral 1 indicates an input device. When an input is made by the input device 1, the input device operation signal is given from the input device 1 to the input monitoring circuit 2. When the input monitoring circuit 2 receives an input device operation signal from the input device 1, the input monitoring circuit 2 outputs a reset signal to the timer 3
Give to. The timer 3 receives a clock signal from the oscillator 4. The timer 3 counts the clock signal from the oscillator 4 from the time when the reset signal is received from the input monitoring circuit 2 and gives the count value to the comparator 5. That is, the timer 3 measures the elapsed time from the time when there is an input from the input device 1.

The output terminal of the comparator 5 is connected to the central processing unit 6. In this central processing unit 6,
The memory 7, the timeout time setting register 8 and the power-off register 9 are connected. A power supply circuit 10 is connected to all the devices and circuits described above.

The central processing unit 6 gives a timeout time setting value to the timeout time setting register 8. The timeout time setting register 8 gives the timeout time setting value to the comparator 5. The comparator 5 generates a time-out signal and gives it to the central processing unit 6 when the count value from the timer 3 becomes equal to the time-out time setting value from the time-out time setting register 8.

When the central processing unit 6 receives the time-out signal from the comparator 5, the central processing unit 6 stores the data of the central processing unit 6 in the memory 7 and saves it, and then supplies the power-off information to the power-off register. When the power-off information is received, the power-off register 9 turns off the power supplied from the power circuit 10 to the devices and circuits.

[0011]

According to the present invention, when there is no input from the input device of the information processing device for a predetermined time or more, the power supply from the power supply circuit to the information processing device is stopped, and the power supply is stopped. The data of the central processing unit immediately before the stop can be saved.

[Brief description of drawings]

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

[Explanation of symbols]

 1 Input Device 2 Input Device Monitoring Circuit 3 Timer 5 Comparator 6 Central Processing Unit 7 Memory 8 Timeout Time Setting Register 9 Power Off Register 10 Power Supply Circuit

Claims (1)

[Claims] 1. A power supply system for supplying power from a power supply circuit to an information processing apparatus, the time measuring means for measuring an elapsed time from a time point when an input device of the information processing apparatus receives an input, and the time measuring means. A predetermined time elapse determination unit that generates a time-out signal when the elapsed time reaches a predetermined time, and a data saving unit that receives the time-out signal from the predetermined time elapse determination unit and stores the data of the central processing unit in a memory, An electric power supply system comprising: electric power supply stopping means for stopping the supply of electric power from the power supply circuit to the information processing apparatus after storing the data of the central processing unit in the memory by the data saving means.