JPH0340264U

JPH0340264U -

Info

Publication number: JPH0340264U
Application number: JP10256689U
Authority: JP
Priority date: 1989-08-31
Filing date: 1989-08-31
Publication date: 1991-04-18

Description

[Brief explanation of drawings]

第１図はこの考案に係る車載用映像表示装置の
余熱用電源制御回路の一実施例を示すブロツク回
路図、第２図は同実施例の正常時の動作を説明す
るためのタイミング図、第３図は同実施例の異常
時の動作を説明するためのタイミング図、第４図
は従来の余熱用電源制御回路の構成を示すブロツ
ク回路図、第５図及び第６図はそれぞれ第４図の
回路の動作を説明するためのタイミング図である
。１１……バツテリ、１２……ＡＣＣ（アクセサ
リ）スイツチ、１３……ＩＧ（イグニツシヨン）
スイツチ、１４……ＤＲ（ドア）スイツチ、１５
〜１９……入力端子、２０……制御部、２０１〜
２０３……ＡＮＤゲート、２０４……タイマ回路
、２１……電力供給部、２１１……トランジスタ
、２１２……エミツタ抵抗、２１３……逆流防止
用ダイオード、２２……ヒータ駆動電圧出力端子
、２３……第１の制御部、２３１〜２３３……Ａ
ＮＤゲート、２３４……第１のタイマ回路、２３
５……第２のタイマ回路、２４……第２の制御部
、２４１……ＡＮＤゲート、２４２……ラツチ回
路、２４３……ＯＲゲート、２４４……ＡＮＤゲ
ート、２４５……制御回路。 FIG. 1 is a block circuit diagram showing an embodiment of the power supply control circuit for residual heat of an in-vehicle video display device according to this invention, FIG. 2 is a timing diagram for explaining the normal operation of the embodiment, and FIG. 3 is a timing diagram for explaining the operation of the same embodiment in the event of an abnormality, FIG. 4 is a block circuit diagram showing the configuration of a conventional residual heat power supply control circuit, and FIGS. 5 and 6 are respectively shown in FIG. FIG. 3 is a timing diagram for explaining the operation of the circuit. 11... Battery, 12... ACC (accessory) switch, 13... IG (ignition)
Switch, 14...DR (door) switch, 15
~19...Input terminal, 20...Control unit, 201~
203...AND gate, 204...Timer circuit, 21...Power supply unit, 211...Transistor, 212...Emitter resistor, 213...Reverse current prevention diode, 22...Heater drive voltage output terminal, 23... First control unit, 231-233...A
ND gate, 234...first timer circuit, 23
5... Second timer circuit, 24... Second control section, 241... AND gate, 242... Latch circuit, 243... OR gate, 244... AND gate, 245... Control circuit.

Claims

[Scope of Claim for Utility Model Registration] (1) In the residual heat power supply control circuit that controls the power supply to the monitor residual heat generation source of a battery-powered in-vehicle video display device, the door of the installed vehicle is opened. ion signal generating means for generating an on signal for a certain period of time by inputting a detection signal from a door switch that detects the ion signal; and a power supply means for supplying power to the monitor residual heat generation source in response to the on signal generated by the means; Off signal generating means that is activated by the on signal generated by the on signal generating means and supplies an off signal to the power supply means to forcibly stop power supply after a period longer than a set period of the means has elapsed; A residual heat power supply control circuit for an in-vehicle video display device, comprising: (2) Both the on-signal generating means and the off-signal generating means are constituted by a timer circuit, and the timer circuit of the on-signal generating means is activated by the detection signal of the door switch and outputs an on-signal for a certain period of time, and the off-signal generating means The in-vehicle device according to claim (1), wherein the timer circuit is activated by the ON signal output of the timer circuit of the ON signal generating means, and outputs the OFF signal after a period longer than the set period of the timer circuit. Power supply control circuit for residual heat of video display equipment.