JPS59132018A - Power supply control system - Google Patents

Abstract

PURPOSE:To cut off the electric power safely, by holding the power supply without cutting off the power immediately when the power-off operation is performed and releasing this state after a time required for functions of a controlling part elapses. CONSTITUTION:A DC power supply unit 1 supplies an AC input to a function unit 2 as a DC voltage through a contact ms1, which is turned on by the operation of a switch SWON of a power supply control unit 3. Even if the contact ms1 is turned off by the power-off operation of a switch SWOFF, the power supply is continued because a contact rL3 of a relay RL3 is held in the turn-on state; but a differentiating circuit 34 detects this power-off to report it to a controlling part 31. The controlling part 31 executes a power-off countermeasure processing required for the function unit 2 in accordance with a program stored in a storage part 32 by interruption, and the contact rL3 is turned off through an FF33 after this processing is terminated, and thus, the power is cut off.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to improvements in power supply control systems for electrical equipment.

(b) Background of the Technology Traditionally, electrical equipment converts an AC or DC input power source, usually a commercial AC input power source, directly or from the input power source into a desired power source or sources, e.g., a certain DC voltage, for the functional operation of the electrical equipment. In addition, it is equipped with a sequence control function for power on/off to ensure normal operation of each functional unit in electrical equipment. On the other hand, in recent years semiconductor technology
In particular, with the development of integration technology, highly integrated circuits (LSI), such as microprocessors (MPUs) and IC memories, have become available at low prices, and the control functions of electrical equipment that were conventionally used in wired circuits such as relays have been replaced by electronic circuits. The means by combining hardware and software are small, high speed,
It has come to be used in a wide range of fields due to its power saving, versatility, and high reliability.

(C) Prior Art and Problems Conventionally, when power is turned on and off to electrical equipment, sequential power on/off control is ensured during normal operation using fixed wiring of relays or logic circuits using electronic circuits, as described above.

Figure 1 is a block diagram of a conventional power supply control system, Figure 2
The time chart is shown in the figure.

In the figure, 1 is a DC power supply unit, 2 is a functional unit, NFB is a no-fuse breaker, MSl is a magnetic switch, RLI, RL2 are relays, T is a power transformer, DI is a rectifier diode, Dt is a reverse voltage prevention diode, and 5WoN is a Spring switch for manual power on, 5W
oFF is a flip switch for manual power disconnection and C is a capacitor. Then, when the operator presses 5WoN, RLI and MSI are activated in order, and a predetermined direct current is supplied from unit 1 to functional unit 2. Regarding disconnection, when the operator presses 5W-OFF, the RLI and MSI are activated in sequence, and the DC supply from the unit 1 is disconnected. Although not shown in the figure, if there are multiple functional units that need to be turned on in order, other relays or magnetic switches must be operated continuously below MS1 to output the output of unit 1 or input to other DC power supply units. This is achieved by inserting and cutting. In addition, the unit 1 and/or the functional unit 2 are equipped with a circuit environment detection function such as a temperature/humidity alarm, an overvoltage value, and/or an overcurrent detection function, and when an abnormality is detected, a disconnection signal is sent and, for example, RL2 is activated. It is equipped with a means to disconnect the power supply. As described above, since the conventional power supply control system operates, there are cases where an operator accidentally presses the 5 WoF while the electrical equipment is in operation, or when an abnormality is detected and the power is turned off. At that time, in the configuration of the functional unit 2, I
If the power supply is cut off during operation, the power control section sets the capacitance of the capacitor C connected to the power supply to a sufficiently large value and performs a disconnection operation when the power supply is cut off during operation. Although care has been taken to ensure that there is no problem, storage methods may malfunction or
There are cases where part of the memory contents are lost. Further, even if there is no malfunction or loss of memory contents, there are drawbacks such as requiring labor for the next reboot and requiring a long time for initialization.

(d) Purpose of the Invention In order to eliminate the above-mentioned drawbacks, the purpose of the present invention is to immediately turn off the power in response to a power cut-off operation that occurs while a functional part is in operation or due to an alarm signal, etc. The purpose of the present invention is to provide a power supply control method in which the power supply is cut off more safely by providing a means for holding the power supply without any problem, and releasing the holding means after a lapse of a necessary time depending on the function of the control section.

(e) Structure and object of the invention is that in a power supply system for electrical equipment, a power supply control unit includes means for comparing other components, a storage means for receiving and temporarily storing the detection signal, and a memory that can be written to the storage means. a ψ stage that holds a turn-on signal in the power supply unit according to the data, and when a power-off operation is performed or a power-off signal is obtained, the control section in the power supply control unit supplies power to the turn-on signal holding means. At the same time, the unit is made to continue to be held, and the memory section is separately accessed and the function name unit is made to execute interrupt control, etc., and after the nuclear interrupt control etc. are completed, the storage means is reset and the holding operation by the input signal holding means is performed. This can be achieved by providing a power supply control method characterized in that the power supply is cut off when the power is released.

(f) Embodiment of the Invention An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is a block diagram of a power supply control system in an embodiment of the present invention, and FIG. 4 is a time chart thereof.

In the figure, 1 is a DC power supply unit, 2 is a functional unit, 3 is a power supply control unit, 31 is a control section, 32 is a storage section, and 33 is a set/reset flip-flop circuit (FF
), 34 is a differential circuit, NFB is a no-use breaker,
MSI is a magnet switch, RLI, Rb2. Rb2
is a relay, T is a power transformer, Dl is a rectifier diode,
D is a reverse voltage prevention diode, and 5WoN is a rebound switch for manual power-on, SW. , is a rebound switch for manual power disconnection, C is a capacitor, and R is a resistor. In the drawings, components having the same reference numerals as those in the conventional system have functions and characteristics common to those in the conventional system. In one embodiment of the present invention, the power is turned on by 5WoN as in the past, and the power is turned off by the operation of SWo, F and the disconnection signal accompanying the alarm generation. Unlike before, MS
Even if I is opened, Rb2 under the control of the control unit 31 composed of MPU is held and its contact rls is connected to unit 1.
The difference is that it is configured to hold . In one embodiment of the present invention, an AC input is applied to the unit 1 by the MSI, and when a predetermined DC voltage is output, a DC voltage is also applied to R. One end of R is short-circuited to ground potential by its contact ms when the MSI is activated, and a low level is applied to the cent input terminal of F-F1a, resulting in the FF
1" is output to the output Q of F-F1a, driving Rb2 and keeping its contact r13 on. In this state, even while the functional unit 2 is operating, a low level is applied to the reset input terminal of F-F1a. Since it never happens, it is kept continuously.

At this point, when 5WoFF is pressed or a disconnection signal is input to Rb2, MSI is restored and turns off, but R-L3 continues to hold the state. When the MSI is restored, the contact mS is turned off, and the ground potential at one end of R rises to, for example, a positive potential at the power supply potential. Differential circuit 3
4 detects the change in the rise of the front and notifies the control unit 31 that the power supply has been cut off. The control section 3 is the storage section 32.
The functional unit 2 is caused to interrupt and execute necessary power-off countermeasure processing according to a program stored in the storage area of , for example, a men maskable interconnected (NMi) processing program routine. Although not shown, the control unit 31 enables power-off operation when the process is completed, sends a low level to the reset input terminal of the FF 33 to reset it, outputs O'' to Q, restores Rb2, and turns off the contact r13. By controlling the power cut in this way, the memory functions of IC memory, floppy disks, etc. will be protected, and one operation will not occur as in the past, the memory contents will be lost, and the initial This provides an exhaustive power supply control system that requires a lot of time for the conversion operation.

(g) As described in detail, according to the present invention, the power is not cut off uniquely as in the conventional case, but is controlled so that the power is cut off by automatically performing the cut-off countermeasure processing, which is useful. A power supply control method can be provided.

[Brief explanation of the drawing]

Figure 1 is a block diagram of a conventional power supply control system;
The figure is a tie 11 chart, FIG. 3 is a block diagram of a power supply control system according to an embodiment of the present invention, and FIG. 4 is a time chart thereof. In the figure, 1 is a DC power supply unit, 2 is a functional unit, 3 is a power supply control unit, 31 is a control section, 32 is a storage section, 33 is a flip-flop circuit, 34 is a differential circuit, 5
WoN, 5WoFF is a switch, M-81 is a magnet switch and RLI, Rb2. R-L3 is a relay. Figure 1 (0) 5Woy, , J--He--(G) Fake -r-111-1-11 (C) time -7-------L--

Claims (1)

[Claims] A means for detecting a normal voltage supply state in a power supply system of an electrical device, a storage means for receiving and temporarily storing the detection and signal, and holding a turn-on signal in the power supply unit according to stored data in the storage means. When a power-off operation is performed or a power-off signal is obtained, the control section in the power control unit causes the on-signal holding means to continue holding the power supply unit, and separately accesses the storage section. Then, the function board unit executes the interrupt control, etc., and after the interrupt control, etc. is finished, the storage means is stored in 1. A power supply control method characterized in that the holding operation by the input signal holding means is released by setting the power supply, and the power supply is cut off.