JPS6115217A - Cut-off controller for application of power supply - Google Patents

Abstract

PURPOSE:To control the cut-off time point for application of a power supply according to the state of a load by supplying the output signal of a comparator to a computer to decide the propriety of the cut-off operation by an operating system of the computer and delivering a command signal based on the result of said decision. CONSTITUTION:A comparator 4b transmits the time coincidence signal to an external unit via a signal line 7 when the coincidence is obtained between the output of a timepiece 3 and the contents of a register 2. The external unit knows a scheduled cut-off time point of the power supply from the signal on the line 7 and then decides the propriety of the cut-off of the power supply. If the cut- off is possible, the external unit delivers a power supply cut-off command signal via a signal line 8 to control a control circuit 5. In the case of a computer, the interruption is applied to the computer by the signal on the line 7. Thus a deciding program is started to decide whether or not an operating system processed all jobs. Then the signal on the line 8 is outputted to the circuit 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a power on/off control device that automatically turns on and off the power of a computer or the like.

[Prior art]

FIG. 1 is a block diagram showing an example of a conventional power on/off control device. In the figure, fil, +2)a are registers, and (3) is a clock that outputs a digital code representing the time, for example, from a counter and a pulse generator that inputs one pulse every second to this counter. configured. (4a) and (4b) are comparators, (5) is a control circuit, and (6) is a contact signal output to the outside, and this contact signal turns on and off power to a predetermined external device. control.

A digital code representing the first time is set in register (1) (referred to as the first register in this specification), and a second time is set in register (2) (referred to as the second register in this specification). Set the digital code representing the clock (3
) matches the contents of the register (1), the comparator (4&) outputs a signal to control the control circuit (5), closes the contact signal (6), and connects it to a predetermined external device. Power is turned on. Similarly, when the output of the 1 clock (3) matches the contents of the register (2), the comparator (4b) outputs a signal to control the control circuit (5) and open the contact signal (6). The power of the predetermined external device is cut off.

Although the conventional device shown in FIG. 1 is convenient for controlling lighting on and off, for example, it is not suitable for cases where the predetermined external device is a computer. When a computer is operated unattended to perform a specified task, even if the power can be turned on at a preset time, the power may be turned off at the time when all necessary processing has been completed. It must be postponed until completed. In other words, the time at which the power can be turned off changes depending on the amount of jobs input to the computer, and the final decision to turn off the power cannot be made by the power on/off control device. The device shown in Figure 1 is a so-called intelligent device that operates by being equipped with a judgment mechanism within itself, like an electronic computer.
It has the disadvantage that it cannot be used for devices with high y).

[Summary of the invention]

This invention was made in order to eliminate the drawbacks of the conventional ones as described above.
The output signal of the comparator (4b) is not controlled to immediately turn off the power by the output of b), but the output signal of the comparator (4b) is input to the computer, and the O8 (operating system) judges whether or not to turn off the power, and the command signal is generated based on the judgment result. It was decided to control the control circuit (5) by the following.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a block diagram showing an embodiment of the present invention, in which the same reference numerals as in FIG. 1 indicate the same or corresponding parts, and (
7) and (81 are signal lines, respectively.

In FIG. 2, parts having the same reference numerals as those in FIG. 1 operate in the same manner as in FIG. 1, so a redundant explanation will be omitted. clock(
When the output of 3) matches the contents of the register (2), the comparator (4b) transmits a time match signal to the external device via the signal line (7). The external device learns from the signal on the signal line (7) that the scheduled time to disconnect the power source has arrived, determines whether it is possible to disconnect the power, and then sends a power disconnect command signal via the signal line (8) if it is possible to disconnect the power. is output to control the control circuit (5).

In the example of a computer, the signal on the signal line (7) interrupts the computer and starts the judgment program.
The O8 determines whether all the jeeps have been processed and outputs a signal on the signal line (8).

The registers fil, f2) shown in FIG. 2 are of a general form as a memory that can set any time from the outside, but they can also be used as ROM (read-only memory,
A semi-permanent memory such as a ROM (including a ROM using a mechanical switch) may also be used, so in this specification, the term "register" includes the above-mentioned category.

〔Effect of the invention〕

As described above, according to the present invention, it is possible not only to automatically operate the device by turning on and off the power to the external device at preset times, but also to automatically operate the device according to the load status of the external device at that time. Cutting time can be controlled. For example, in a computer, if there are no remaining jobs when a signal indicating the scheduled power-off time is input, the power is turned off at that point, and if there are remaining jobs, the power is turned off after completing all remaining jobs. can be output.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional device, and FIG. 2 is a block diagram showing an embodiment of the present invention. (1)...first register, (2)...second register, (3)...clock, (4a)...first comparator, (4b)...second comparator, (5)...control circuit, (6)...contact signal, (7), (8)...respectively signal line. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] a clock that generates a digital code representing time; a first register in which a digital code representing a first time is set; a second register in which a digital code representing a second time is set; A first unit that compares the content with the output of the clock and outputs a time matching signal when the two match.
A second comparator that compares the contents of the second register with the output of the clock and outputs a time coincidence signal when the two match, and a time coincidence signal output from the first comparator. A predetermined power source is turned on, a time coincidence signal outputted from the second comparator is sent to a predetermined device operated by the predetermined power source, and a response signal from the predetermined device to the sent signal causes the time matching signal to be outputted from the second comparator. A power on/off control device comprising means for controlling the power off of the device.