CA2243462A1 - An oscillator - Google Patents

An oscillator

Info

Publication number
CA2243462A1
CA2243462A1 CA002243462A CA2243462A CA2243462A1 CA 2243462 A1 CA2243462 A1 CA 2243462A1 CA 002243462 A CA002243462 A CA 002243462A CA 2243462 A CA2243462 A CA 2243462A CA 2243462 A1 CA2243462 A1 CA 2243462A1
Authority
CA
Canada
Prior art keywords
oscillator
resonant circuit
power supply
pulse time
voltage limiter
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
CA002243462A
Other languages
French (fr)
Other versions
CA2243462C (en
Inventor
Ian Macdonald Green
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.)
Central Research Laboratories Ltd
Original Assignee
Central Research Laboratories Limited
Ian Macdonald Green
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 Central Research Laboratories Limited, Ian Macdonald Green filed Critical Central Research Laboratories Limited
Publication of CA2243462A1 publication Critical patent/CA2243462A1/en
Application granted granted Critical
Publication of CA2243462C publication Critical patent/CA2243462C/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
    • H05B41/282—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
    • H05B41/2821—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 by means of a single-switch converter or a parallel push-pull converter in the final stage
    • 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
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
    • H05B41/3927—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by pulse width modulation

Abstract

An oscillator, capable of delivering power from a d.c. power supply to a load at frequencies above 100 kHz comprises a pair of field effect transistors (16, 17) operating in anti phase in a resonant circuit and a voltage limiter (35) which in operation introduces a phase shift to the resonant circuit and returns energy to the power supply. The voltage limiter preferably comprises a diode clipper which is inductively coupled to the resonant circuit. A pulse time modulation drive system for an electrodeless backlight comprises such an oscillator together with control means for starting and stopping the oscillator according to a pulse time modulation scheme.
CA002243462A 1996-01-18 1997-01-13 An oscillator Expired - Fee Related CA2243462C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB9600982.4A GB9600982D0 (en) 1996-01-18 1996-01-18 An oscillator
GB9600982.4 1996-01-18
PCT/GB1997/000099 WO1997026705A1 (en) 1996-01-18 1997-01-13 An oscillator

Publications (2)

Publication Number Publication Date
CA2243462A1 true CA2243462A1 (en) 1997-07-24
CA2243462C CA2243462C (en) 2001-08-21

Family

ID=10787186

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002243462A Expired - Fee Related CA2243462C (en) 1996-01-18 1997-01-13 An oscillator

Country Status (5)

Country Link
CA (1) CA2243462C (en)
DE (1) DE19781524T1 (en)
GB (2) GB9600982D0 (en)
NL (1) NL1005035C2 (en)
WO (1) WO1997026705A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6118226A (en) 1998-07-31 2000-09-12 Federal-Mogul World Wide, Inc. Electrodeless neon light module for vehicle lighting systems
US6819057B2 (en) * 2000-10-31 2004-11-16 Osram Sylvania Inc. Ballast self oscillating inverter with phase controlled voltage feedback
US6624593B2 (en) * 2001-10-08 2003-09-23 Randall D. Blanchard Dimmable ballast for electrodeless fluorescent lamps
CN110740555B (en) * 2019-10-24 2021-04-30 苏州锐联芯半导体有限公司 Full-integrated electric vehicle flasher driving chip

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU555174B2 (en) * 1981-09-18 1986-09-18 Oy Helvar Electronic ballast for a discharge lamp
NL8503008A (en) * 1985-11-04 1987-06-01 Philips Nv DC AC CONVERTER FOR IGNITION AND POWER OF A DISCHARGE LAMP.
WO1992001334A1 (en) * 1987-12-11 1992-01-23 Murray Scott V Magnetic structure and power converter for light sources
DE69016815T2 (en) * 1989-04-14 1995-09-07 Tlg Plc Ballasts for gas discharge lamps.
US5172033A (en) * 1990-09-14 1992-12-15 U. S. Philips Corporation Discharge lamp operating inverter circuit with electric dimmer utilizing frequency control of the inverter
US5150018A (en) * 1991-08-12 1992-09-22 North American Philips Corporation Gas discharge lamp with grid and control circuits therefor
US5191302A (en) * 1991-11-25 1993-03-02 Lepel Corporation MOSFET oscillator for supplying a high-power RF inductive load
US5272327A (en) * 1992-05-26 1993-12-21 Compaq Computer Corporation Constant brightness liquid crystal display backlight control system
US5416388A (en) * 1993-12-09 1995-05-16 Motorola Lighting, Inc. Electronic ballast with two transistors and two transformers

Also Published As

Publication number Publication date
GB9700557D0 (en) 1997-03-05
DE19781524T1 (en) 1998-12-17
GB2309344A (en) 1997-07-23
CA2243462C (en) 2001-08-21
NL1005035A1 (en) 1997-07-22
GB2309344B (en) 1998-04-15
GB9600982D0 (en) 1996-03-20
WO1997026705A1 (en) 1997-07-24
NL1005035C2 (en) 1997-08-05

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed