JPS5873052U

JPS5873052U - Lamp burnout alarm

Info

Publication number: JPS5873052U
Application number: JP10059981U
Authority: JP
Inventors: 正己武内; 輝儀三原
Original assignee: 日産自動車株式会社
Priority date: 1981-07-08
Filing date: 1981-07-08
Publication date: 1983-05-17

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は従来のランプ切れ警報器の回路図、第２図はこ
の考案の原理を示す図、第３図はランプの合成抵抗値の
特性を示す図、第４図はコンデンサの端子電圧を示す図
、第５図はコンデンサの放電特性を示す図、第６図ａ、
　　ｂはこの考案の一実施例を示すもので、第６図ａは
回路構成図、第６図すは動作説明のための波形図、第７
図はスイッチの一例を示す構成図、第８図はランプ抵抗
の変化の状態を示す図、第９図はこの考案の他の実施例
を示す回路図である。図中、１ａ〜１ｄはランプ、２はスイッチ、３は［源、
１１はコンデンサ、１２はスイッチ、１３は抵抗器、１
４は入力保護回路、１５はスイッチ制御回路、１６はセ
ンスアンプ、１７は傾斜重用発生回路、１８は電圧／時
間変換回路、′１９はナントゲート、２０はリセットパ
ルス発生回路、２１はパルス幅比較回路、２２は表示器
である。Figure 1 is a circuit diagram of a conventional lamp burnout alarm, Figure 2 is a diagram showing the principle of this invention, Figure 3 is a diagram showing the characteristics of the combined resistance value of the lamp, and Figure 4 is a diagram showing the terminal voltage of the capacitor. Figure 5 is a diagram showing the discharge characteristics of a capacitor, Figure 6a,
Fig. 6b shows an embodiment of this invention, Fig. 6a is a circuit configuration diagram, Fig. 6 is a waveform diagram for explaining the operation, and Fig. 7 is a waveform diagram for explaining the operation.
FIG. 8 is a block diagram showing an example of a switch, FIG. 8 is a diagram showing changes in lamp resistance, and FIG. 9 is a circuit diagram showing another embodiment of this invention. In the figure, 1a to 1d are lamps, 2 is a switch, 3 is a source,
11 is a capacitor, 12 is a switch, 13 is a resistor, 1
4 is an input protection circuit, 15 is a switch control circuit, 16 is a sense amplifier, 17 is a slope heavy duty generation circuit, 18 is a voltage/time conversion circuit, '19 is a Nant gate, 20 is a reset pulse generation circuit, 21 is a pulse width comparison The circuit 22 is a display.

Claims

[Scope of utility model registration request]

a capacitor disposed in parallel with a lamp connected to a power source via a switch, charged by the power source and discharged through the lamp after the switch is turned off;
A circuit that detects the time from when the capacitor starts discharging until the terminal voltage of the capacitor reaches a predetermined voltage and generates a pulse with a pulse width corresponding to that time, and a determination reference time based on the voltage of the power supply. a circuit that generates pulses with corresponding pulse widths in synchronization with the beginning of discharge of the capacitor; and a circuit that compares the pulse widths of both circuits;
A lamp burnout alarm comprising: an indicator activated by the output of the circuit that compares the pulse widths.