GB1448044A - Electric lamp failure indicators - Google Patents

Electric lamp failure indicators

Info

Publication number
GB1448044A
GB1448044A GB2649874A GB2649874A GB1448044A GB 1448044 A GB1448044 A GB 1448044A GB 2649874 A GB2649874 A GB 2649874A GB 2649874 A GB2649874 A GB 2649874A GB 1448044 A GB1448044 A GB 1448044A
Authority
GB
United Kingdom
Prior art keywords
lamp
winding
amplitude
failure
induced
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
GB2649874A
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.)
Welwyn Electric Ltd
Original Assignee
Welwyn Electric 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 Welwyn Electric Ltd filed Critical Welwyn Electric Ltd
Priority to GB2649874A priority Critical patent/GB1448044A/en
Priority to FR7518534A priority patent/FR2274981A1/en
Priority to DE19752526401 priority patent/DE2526401A1/en
Publication of GB1448044A publication Critical patent/GB1448044A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/145—Indicating the presence of current or voltage
    • G01R19/15—Indicating the presence of current
    • 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
    • B60Q11/005—Arrangement of monitoring devices for devices provided for in groups B60Q1/00 - B60Q9/00 for lighting devices, e.g. indicating if lamps are burning or not
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/005—Testing of electric installations on transport means
    • G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Abstract

1448044 Lamp failure alarms WELWYN ELECTRIC Ltd 14 June 1974 26498/74 Heading G4N An alarm device for detecting the failure of a lamp 5 in its energized or un-energized state comprises a magnetic former 1, a first winding 2 in circuit with the lamp 5, a second winding 3 supplying current pulses and a third winding 4 for detecting the amplitude of a voltage or current induced in it as a result of a change in amplitude of the flux density caused by the lamp failure. In the un-energized state of the lamp, pulses are induced in the loop including winding 2, lamp 5 and a capacitor 27. With a faulty lamp, the amplitude of variations sensed by the winding 4 is large as either the former 1 is no longer magnetically saturated or that the pulses provided by winding 3 are no longer opposed by those induced in 2 and this change is sensed by a pulse amplitude discriminator 9 for activating a warning lamp or a buzzer 10. As an alternative to using two formers for a pair of lamps, in the embodiment of Fig. 3 (not shown), the lamps are connected to a pair of windings having a common connection connected to the energizing source.
GB2649874A 1974-06-14 1974-06-14 Electric lamp failure indicators Expired GB1448044A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB2649874A GB1448044A (en) 1974-06-14 1974-06-14 Electric lamp failure indicators
FR7518534A FR2274981A1 (en) 1974-06-14 1975-06-13 ELECTRIC LAMP FAILURE INDICATOR
DE19752526401 DE2526401A1 (en) 1974-06-14 1975-06-13 DEVICE FOR INDICATING THE FAILURE OF AN ELECTRIC LAMP

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2649874A GB1448044A (en) 1974-06-14 1974-06-14 Electric lamp failure indicators

Publications (1)

Publication Number Publication Date
GB1448044A true GB1448044A (en) 1976-09-02

Family

ID=10244609

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2649874A Expired GB1448044A (en) 1974-06-14 1974-06-14 Electric lamp failure indicators

Country Status (3)

Country Link
DE (1) DE2526401A1 (en)
FR (1) FR2274981A1 (en)
GB (1) GB1448044A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4642616A (en) * 1985-02-14 1987-02-10 Prime Computer, Inc. Method and apparatus for detection of AC power failure conditions
BE902709A (en) * 1985-06-20 1985-12-20 Backer Adrien Sa METHOD AND DEVICE FOR MONITORING LIGHT BEACONS.
EP0254804A3 (en) * 1986-08-01 1989-07-19 Tideland Signal Corporation Electrical continuity sensing circuit

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2115662A1 (en) * 1970-04-02 1971-10-21 Luebeck S Device for discovering and displaying faults in an electrical direct current system of a vehicle
DE2235642A1 (en) * 1972-07-20 1974-01-31 Bosch Gmbh Robert DEVICE FOR CONTROLLING ELECTRICAL CONSUMERS IN MOTOR VEHICLES

Also Published As

Publication number Publication date
FR2274981A1 (en) 1976-01-09
DE2526401A1 (en) 1976-01-02

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee