GB1335803A - Lighting system having a lamp failure indicator - Google Patents

Lighting system having a lamp failure indicator

Info

Publication number
GB1335803A
GB1335803A GB1094372A GB1094372A GB1335803A GB 1335803 A GB1335803 A GB 1335803A GB 1094372 A GB1094372 A GB 1094372A GB 1094372 A GB1094372 A GB 1094372A GB 1335803 A GB1335803 A GB 1335803A
Authority
GB
United Kingdom
Prior art keywords
lamp
transistor
diodes
resistance
lighting system
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.)
Expired
Application number
GB1094372A
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.)
Motors Liquidation Co
Original Assignee
Motors Liquidation Co
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 Motors Liquidation Co filed Critical Motors Liquidation Co
Publication of GB1335803A publication Critical patent/GB1335803A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q11/00—Arrangement of monitoring devices for devices provided for in groups B60Q1/00 - B60Q9/00

Abstract

1335803 Transistor comparators GENERAL MOTORS CORP 9 March 1972 [29 April 1971] 10943/72 Heading H3T [Also in Division G4] In a lighting system comprising at least one lamp 46, a resistance 50 is connected in series with lamp 46, the voltage across resistor 50 being monitored by a differential comparator 56<SP>1</SP>, 58<SP>1</SP>, the output of the comparator being monitored at 88<SP>1</SP> so as to provide a signal to an amplifier 40 and indicator 42 of failure of lamp 46. As described, lamp 46 may be a "running lamp" energized whenever the ignition switch 48 of a vehicle is closed. Resistance 50 is arranged to drop 20 mV and may merely be wiring resistance. Transistors 78<SP>1</SP>, 80<SP>1</SP> are controlled by a Zener diode 74<SP>1</SP> so that constant current flows through diodes 52<SP>1</SP>, 54<SP>1</SP>; the voltages dropped in diodes 52<SP>1</SP> and 54<SP>1</SP> are such that normally transistor 56<SP>1</SP> passes more current than 58<SP>1</SP> but resistors 60<SP>1</SP>, 62<SP>1</SP> are adjusted so that the collector voltages of transistor 56<SP>1</SP> and 58<SP>1</SP> are equal when lamp 46 is operating. Failure of lamp 46 causes decrease in current of transistor 561 and increase in that of transistor 58<SP>1</SP> so that the detecting transistor 88<SP>1</SP> is turned on which feeds a signal via diode 110 to an amplifier 40 which operates lamp 42. A similar arrangement is utilized for monitoring pairs of headlamps 14, 15; 16, 17. Diodes 70, 72, 102,108 provide temperature compensation.
GB1094372A 1971-04-29 1972-03-09 Lighting system having a lamp failure indicator Expired GB1335803A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13860271A 1971-04-29 1971-04-29

Publications (1)

Publication Number Publication Date
GB1335803A true GB1335803A (en) 1973-10-31

Family

ID=22482771

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1094372A Expired GB1335803A (en) 1971-04-29 1972-03-09 Lighting system having a lamp failure indicator

Country Status (6)

Country Link
US (1) US3735378A (en)
AU (1) AU464229B2 (en)
CA (1) CA955651A (en)
DE (1) DE2220019A1 (en)
FR (1) FR2135216B1 (en)
GB (1) GB1335803A (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3955174A (en) * 1972-04-20 1976-05-04 C.A.V. Limited Direction indicator system for road vehicles with trailer adapter means
DE2235642A1 (en) * 1972-07-20 1974-01-31 Bosch Gmbh Robert DEVICE FOR CONTROLLING ELECTRICAL CONSUMERS IN MOTOR VEHICLES
US3857062A (en) * 1973-08-27 1974-12-24 Cav Ltd Flashing lamp circuits
DE2602702C2 (en) * 1976-01-24 1983-09-08 Bayerische Motoren Werke AG, 8000 München Circuit arrangement for testing operational functions in motor vehicles
US4195281A (en) * 1977-03-21 1980-03-25 Essex Group, Inc. Lamp outage indicator circuit
JPS55136498A (en) * 1979-04-12 1980-10-24 Niles Parts Co Ltd W lamp disconnection detector circuit
US4550303A (en) * 1984-04-05 1985-10-29 General Motors Corporation Lamp monitor with latch circuit
JPH0629116Y2 (en) * 1985-04-12 1994-08-10 株式会社東海理化電機製作所 Lamp burnout detection device
US4810936A (en) * 1986-12-01 1989-03-07 Hubbell Incorporated Failing lamp monitoring and deactivating circuit
GB2270810B (en) * 1992-09-21 1996-06-19 Nissan Motor System for and method of lighting discharge lamp
US6127782A (en) * 1998-10-15 2000-10-03 Hubbell Incorporated Externally mountable discharge lamp ignition circuit having visual diagnostic indicator
US6429597B1 (en) 1998-10-15 2002-08-06 Hubbell Incorporated Externally mountable discharge lamp ignition circuit having visual diagnostic indicator
US6747425B2 (en) * 2002-01-24 2004-06-08 Asahi Kasei Microsystems Co. Ltd System for sharing power and signal pins on a motor controller

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3171096A (en) * 1962-12-03 1965-02-23 Ford Motor Co Automobile lamp safety circuit
US3408625A (en) * 1965-08-03 1968-10-29 Gen Motors Corp Lamp burnout detection circuit
US3421157A (en) * 1966-01-24 1969-01-07 Wagner Electric Corp Lamp outage detector
US3457561A (en) * 1966-05-02 1969-07-22 Ford Motor Co Auto lamp failure warning circuit
US3593264A (en) * 1968-07-05 1971-07-13 Wagner Electric Corp Vehicle warning circuit
US3535585A (en) * 1968-09-12 1970-10-20 Gen Motors Corp Safety lamp circuit for serially connected vehicle lamps
ES373834A1 (en) * 1968-11-22 1972-02-16 Lucas Industries Ltd Lamp failure warning systems
US3631441A (en) * 1969-01-31 1971-12-28 Herman H Murphy Lamp failure indicator
NL7012352A (en) * 1969-08-26 1971-03-02

Also Published As

Publication number Publication date
AU464229B2 (en) 1975-08-21
US3735378A (en) 1973-05-22
CA955651A (en) 1974-10-01
FR2135216A1 (en) 1972-12-15
DE2220019A1 (en) 1972-11-02
FR2135216B1 (en) 1975-06-13
AU3956072A (en) 1973-09-06

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee