JPS55140624A - Burn-out detector for lamp - Google Patents

Burn-out detector for lamp

Info

Publication number
JPS55140624A
JPS55140624A JP4711579A JP4711579A JPS55140624A JP S55140624 A JPS55140624 A JP S55140624A JP 4711579 A JP4711579 A JP 4711579A JP 4711579 A JP4711579 A JP 4711579A JP S55140624 A JPS55140624 A JP S55140624A
Authority
JP
Japan
Prior art keywords
lamp
burn
comparator
output
resistor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP4711579A
Other languages
Japanese (ja)
Inventor
Koichi Tsukada
Yasuhiko Sakurai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Denso Corp
Original Assignee
NipponDenso Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NipponDenso Co Ltd filed Critical NipponDenso Co Ltd
Priority to JP4711579A priority Critical patent/JPS55140624A/en
Publication of JPS55140624A publication Critical patent/JPS55140624A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To perform a reliable detection of burn-out of a lamp even when the lamp is unlighted, by providing a circuit for supplying weak current to the lamp and a comparator for comparing the voltage across the lamp with a referential voltage where the output during burn-out of a lamp is inverted from normal output.
CONSTITUTION: When the stop switch 2 is turned off, current is supplied through a transistor Tr11, resistors 12, 13, 15 and diodes 14, 16 to Tr20. If the lamps 3a, 3b to which a weak current is supplied from weak current supply circuit 60 containing a resistor R6 is normal, the output of the comparator 10 goes low and the current flowing through the resistor R17 blows into the comparator 10 thereby Tr20 is not turned on. If the lamps 3a, 3b are burned out the output of the comparator 10 goes high, and base current flows from the resistor R7 to Tr20 to turn it on thereby the indicating lamp 5 will light to indicate the burn-out.
COPYRIGHT: (C)1980,JPO&Japio
JP4711579A 1979-04-16 1979-04-16 Burn-out detector for lamp Pending JPS55140624A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4711579A JPS55140624A (en) 1979-04-16 1979-04-16 Burn-out detector for lamp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4711579A JPS55140624A (en) 1979-04-16 1979-04-16 Burn-out detector for lamp

Publications (1)

Publication Number Publication Date
JPS55140624A true JPS55140624A (en) 1980-11-04

Family

ID=12766166

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4711579A Pending JPS55140624A (en) 1979-04-16 1979-04-16 Burn-out detector for lamp

Country Status (1)

Country Link
JP (1) JPS55140624A (en)

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