JPH0467733U

JPH0467733U -

Info

Publication number: JPH0467733U
Application number: JP10918990U
Authority: JP
Priority date: 1990-10-18
Filing date: 1990-10-18
Publication date: 1992-06-16

Description

[Brief explanation of the drawing]

第１図は、本考案の停電バツクアツプ回路のブ
ロツク図。第２図は、本考案の停電バツクアツプ
回路を用いた場合の動作フローチヤート図。第３
図は、従来の停電バツクアツプ回路のブロツク図
。第４図は、従来の停電バツクアツプ回路を用い
た場合の動作フローチヤート図。１……マイクロコンピユータ、２……ＤＣ１２
Ｖバツテリー、３……停電検出回路、４……リセ
ツト回路、５……ＤＣ５Ｖ電源回路、６……入力
端子、７……リセツト端子、８……電解コンデン
サ、９……ダイオード、１０……補助電源用コン
デンサ、１１，１２……接続端子。 FIG. 1 is a block diagram of the power outage backup circuit of the present invention. FIG. 2 is an operational flowchart when using the power outage backup circuit of the present invention. Third
The figure is a block diagram of a conventional power outage backup circuit. FIG. 4 is an operational flowchart when a conventional power failure backup circuit is used. 1...Microcomputer, 2...DC12
V battery, 3... Power failure detection circuit, 4... Reset circuit, 5... DC5V power supply circuit, 6... Input terminal, 7... Reset terminal, 8... Electrolytic capacitor, 9... Diode, 10... Auxiliary Power supply capacitor, 11, 12... Connection terminal.

Claims

[Claims for Utility Model Registration] In a control device that uses a DC 12V battery 2 as a power source and connects it with connection terminals 11 and 12, an input terminal 6 that can detect whether the level of an electric signal is "H" or "L" and a reset terminal 7, and a microcomputer 1 that can program the operation of the control device; and a power failure detection circuit 3 that issues a power failure signal to the input terminal 6 when the connection terminals 11 and/or 12 are disconnected from the DC12V battery 2. , a DC5V power supply circuit 5 that supplies voltage and current to the microcomputer 1, a reset circuit 4 that issues a reset signal to the reset terminal 7 of the microcomputer 1 when the voltage of the DC5V power supply circuit 5 drops, and a DC12V battery 2. It is composed of an electrolytic capacitor 8 that stores voltage, an auxiliary power supply capacitor 10 that stores the voltage of the DC5V power supply circuit 5, and a diode 9 that prevents the voltage stored in the auxiliary power supply capacitor 10 from flowing backward. and 12 are disconnected and power is no longer supplied to the control device, the necessary data is saved on the internal memory and the DC5V
The microcomputer 1 is brought to a halt state by the reset circuit 4 activated by a voltage drop in the power supply circuit 5, and the state before the connection terminals 11 and/or 12 are disconnected is maintained for several tens of minutes by the voltage stored in the auxiliary power supply capacitor 10. hold it for a while, and then connect terminal 1 again.
When 1 and/or 12 are connected and power is supplied to the control device, the reset circuit 4 causes it to operate from the initial program, and the initial program determines whether the data held is correct or not. A power outage backup circuit configured to operate the control device from the state before the power outage if it is correct, and to initialize the data and operate the control device if it is incorrect.