GB1508130A - Emergency lighting systems - Google Patents

Emergency lighting systems

Info

Publication number
GB1508130A
GB1508130A GB3276174A GB3276174A GB1508130A GB 1508130 A GB1508130 A GB 1508130A GB 3276174 A GB3276174 A GB 3276174A GB 3276174 A GB3276174 A GB 3276174A GB 1508130 A GB1508130 A GB 1508130A
Authority
GB
United Kingdom
Prior art keywords
transformer
inverter
current
primary
transistor
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
GB3276174A
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.)
Thorn Electrical Industries Ltd
Original Assignee
Thorn Electrical Industries 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 Thorn Electrical Industries Ltd filed Critical Thorn Electrical Industries Ltd
Priority to GB3276174A priority Critical patent/GB1508130A/en
Publication of GB1508130A publication Critical patent/GB1508130A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
    • H02J9/065—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads for lighting purposes

Abstract

1508130 Transistor oscillators THORN ELECTRICAL INDUSTRIES Ltd 22 July 1975 [24 July 1974] 32761/74 Heading H3T [Also in Division H2] In an emergency lighting system in which, when the mains fail, a fluorescent lamp 24 is supplied by a battery via an inverter 19, the inverter consists of a transistor 25 which automatically becomes conductive when the mains fail, current then flowing through the primary 27 of a current transformer 28 and the primary 26 of the inverter transformer 21. As soon as transformer 28 saturates, owing to cascade action, the primary current collapses causing the secondary current to kick back and the transistor 25 to switch off. Similarly, the current in the primary of transformer 21 reverses and A.C. is induced in the secondary. The value of variable resistor 33 governs the saturation time of transformer 28 and thus the inverter output. A boosting circuit 22 is provided to initially boost the output of the inverter for a predetermined time by connecting a resistor 38 across variable resistor 33.
GB3276174A 1975-07-22 1975-07-22 Emergency lighting systems Expired GB1508130A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3276174A GB1508130A (en) 1975-07-22 1975-07-22 Emergency lighting systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3276174A GB1508130A (en) 1975-07-22 1975-07-22 Emergency lighting systems

Publications (1)

Publication Number Publication Date
GB1508130A true GB1508130A (en) 1978-04-19

Family

ID=10343617

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3276174A Expired GB1508130A (en) 1975-07-22 1975-07-22 Emergency lighting systems

Country Status (1)

Country Link
GB (1) GB1508130A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2269062A (en) * 1992-07-24 1994-01-26 Jsb Electrical Plc Emergency lighting; Battery charging
GB2337644A (en) * 1998-05-22 1999-11-24 Mackwell Electronics Limited Starting and warming up of fluorescent lamps
DE102007047141A1 (en) 2007-10-02 2009-04-09 Tridonicatco Gmbh & Co. Kg Operating device for controlling the baking process of a lamp
DE102010040319A1 (en) 2010-09-07 2012-03-08 Tridonic Gmbh & Co. Kg LED lamp and operating method for a LED lamp

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2269062A (en) * 1992-07-24 1994-01-26 Jsb Electrical Plc Emergency lighting; Battery charging
GB2269062B (en) * 1992-07-24 1996-05-22 Jsb Electrical Plc Lamp control apparatus and method of control
GB2337644A (en) * 1998-05-22 1999-11-24 Mackwell Electronics Limited Starting and warming up of fluorescent lamps
GB2337644B (en) * 1998-05-22 2002-07-17 Mackwell Electronics Ltd Fluorescent Lamps for Emergency Lighting Applications
DE102007047141A1 (en) 2007-10-02 2009-04-09 Tridonicatco Gmbh & Co. Kg Operating device for controlling the baking process of a lamp
WO2009046914A1 (en) 2007-10-02 2009-04-16 Tridonicatco Gmbh & Co. Kg Operating device for controlling the warm-up time of a lamp
DE102010040319A1 (en) 2010-09-07 2012-03-08 Tridonic Gmbh & Co. Kg LED lamp and operating method for a LED lamp
WO2012031926A1 (en) 2010-09-07 2012-03-15 Tridonic Gmbh & Co Kg Led lamp and operating method for an led lamp

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Legal Events

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

Effective date: 19930722