GB2236921A - Electronic ballast circuit for gas discharge lamp - Google Patents

Electronic ballast circuit for gas discharge lamp

Info

Publication number
GB2236921A
GB2236921A GB9023237A GB9023237A GB2236921A GB 2236921 A GB2236921 A GB 2236921A GB 9023237 A GB9023237 A GB 9023237A GB 9023237 A GB9023237 A GB 9023237A GB 2236921 A GB2236921 A GB 2236921A
Authority
GB
United Kingdom
Prior art keywords
lamp
circuit
voltage
additional winding
inductor
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.)
Granted
Application number
GB9023237A
Other versions
GB2236921B (en
GB9023237D0 (en
Inventor
Luke Theodossiou
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.)
ACTIVE LIGHTING CONTROLS
Original Assignee
ACTIVE LIGHTING CONTROLS
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 ACTIVE LIGHTING CONTROLS filed Critical ACTIVE LIGHTING CONTROLS
Publication of GB9023237D0 publication Critical patent/GB9023237D0/en
Publication of GB2236921A publication Critical patent/GB2236921A/en
Application granted granted Critical
Publication of GB2236921B publication Critical patent/GB2236921B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/295—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps with preheating electrodes, e.g. for fluorescent lamps
    • H05B41/298—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2981—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
    • H05B41/2985—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against abnormal lamp operating conditions

Abstract

An electronic ballast circuit for a gas discharge lamp includes a driven inverter (52) the high frequency oscillatory output of which is supplied to a gas discharge lamp (164) through a current limited inductor (154) with a capacitor (160) in parallel with the lamp. A protection circuit includes an additional winding (152) on the inductor (154) which monitors the peak voltage and current of the lamp (164). The signal from the additional winding (152) is fed to a threshold detector and latch circuit (170) which operates to remove the drive from the inverter (52) and de-energise the lamp (164) if the voltage across the lamp exceeds a first predetermined value. Additional protection is provided by a voltage clamping circuit (166) which shorts out the additional winding (152) if the voltage across the lamp exceeds a second predetermined value higher than the first before the lamp is de-energised, thereby to damp the resonant circuit of the inductor (154) and capacitor (160). The additional winding (152) also supplies power for a low-voltage stabilised supply for parts of the ballast circuit. The ballast circuit can supply a number of lamps (164, 264, 364, 464) connected in parallel to the driven inverter (52), a respective inductor (154, 254,354, 454) with additional winding (152, 252, 352, 452), and a respective capacitor (160, 260, 360, 460) being provided for each lamp. <IMAGE>
GB9023237A 1988-04-25 1990-10-25 Electronic ballast circuit for gas discharge lamp Expired - Fee Related GB2236921B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB888809726A GB8809726D0 (en) 1988-04-25 1988-04-25 Electronic ballast circuit for gas discharge lamp
PCT/GB1989/000438 WO1989010679A1 (en) 1988-04-25 1989-04-25 Electronic ballast circuit for gas discharge lamp

Publications (3)

Publication Number Publication Date
GB9023237D0 GB9023237D0 (en) 1991-01-09
GB2236921A true GB2236921A (en) 1991-04-17
GB2236921B GB2236921B (en) 1992-02-05

Family

ID=10635792

Family Applications (2)

Application Number Title Priority Date Filing Date
GB888809726A Pending GB8809726D0 (en) 1988-04-25 1988-04-25 Electronic ballast circuit for gas discharge lamp
GB9023237A Expired - Fee Related GB2236921B (en) 1988-04-25 1990-10-25 Electronic ballast circuit for gas discharge lamp

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB888809726A Pending GB8809726D0 (en) 1988-04-25 1988-04-25 Electronic ballast circuit for gas discharge lamp

Country Status (2)

Country Link
GB (2) GB8809726D0 (en)
WO (1) WO1989010679A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2298749B (en) * 1994-03-04 1998-01-07 Int Rectifier Corp Electronic ballasts for gas discharge lamps

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001078467A1 (en) * 2000-04-10 2001-10-18 Koninklijke Philips Electronics N.V. Ballast with peak detector

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1982001276A1 (en) * 1980-10-07 1982-04-15 Grubbs C Solid state ballast with high frequency inverter fault protection
WO1983002537A1 (en) * 1982-01-15 1983-07-21 Vossough, Eshan Electronic high frequency controlled device for operating gas discharge lamps
DE3432266A1 (en) * 1983-09-06 1985-03-21 F. Knobel Elektro-Apparatebau AG, Ennenda Electronic ballast for fluorescent lamps, and a method for its operation
EP0059064B1 (en) * 1981-02-21 1985-10-02 THORN EMI plc Lamp driver circuits

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1982001276A1 (en) * 1980-10-07 1982-04-15 Grubbs C Solid state ballast with high frequency inverter fault protection
EP0059064B1 (en) * 1981-02-21 1985-10-02 THORN EMI plc Lamp driver circuits
WO1983002537A1 (en) * 1982-01-15 1983-07-21 Vossough, Eshan Electronic high frequency controlled device for operating gas discharge lamps
DE3432266A1 (en) * 1983-09-06 1985-03-21 F. Knobel Elektro-Apparatebau AG, Ennenda Electronic ballast for fluorescent lamps, and a method for its operation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2298749B (en) * 1994-03-04 1998-01-07 Int Rectifier Corp Electronic ballasts for gas discharge lamps

Also Published As

Publication number Publication date
GB8809726D0 (en) 1988-06-02
WO1989010679A1 (en) 1989-11-02
GB2236921B (en) 1992-02-05
GB9023237D0 (en) 1991-01-09

Similar Documents

Publication Publication Date Title
US4857806A (en) Self-ballasted screw-in fluorescent lamp
CA2148399C (en) Protection circuit for arc discharge lamps
US5744915A (en) Electronic ballast for instant-start lamps
US6023132A (en) Electronic ballast deriving auxilliary power from lamp output
ES8401817A1 (en) Electronic ballast for a discharge lamp.
US5512801A (en) Ballast for instant-start parallel-connected lamps
US4692667A (en) Parallel-resonant bridge-inverter fluorescent lamp ballast
DE3265163D1 (en) Ballast circuit for the operation of low-pressure discharge lamps
US5436529A (en) Control and protection circuit for electronic ballast
EP0583838A3 (en) Lamp ballast circuit
SE8008773L (en) RECTIFIER DEVICE WITH FILTERED OUTPUT VOLTAGE
GR3019722T3 (en) Circuit for driving a gas discharge lamp load
JPS57151199A (en) Method and circuit for controlling or regulating heating, arc and luminous flux of low voltage air discharge lamp
MX9504684A (en) Dimming circuit for powering gas discharge lamps.
KR960701498A (en) High Power Factor Circuits for Energizing Gas Discharge Lamps
US5214355A (en) Instant-start electronic ballast
US5438243A (en) Electronic ballast for instant start gas discharge lamps
ES8407286A1 (en) Method of operating a gas-discharge lamp.
US5229927A (en) Self-symmetrizing and self-oscillating half-bridge power inverter
CA2018883A1 (en) Ozone generator equipment and methods
CA2083861A1 (en) Electronic ballast and protection circuit
US4042855A (en) High frequency transistor ballast
GB930082A (en) Improvements in transistor inverter circuits
EP1120020A2 (en) Hid ballast circuit with arc stabilization
US4117373A (en) Emergency/normal lighting circuit for a gaseous discharge lamp

Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19950425