EP0361665A3 - Power circuit - Google Patents

Power circuit Download PDF

Info

Publication number
EP0361665A3
EP0361665A3 EP89308322A EP89308322A EP0361665A3 EP 0361665 A3 EP0361665 A3 EP 0361665A3 EP 89308322 A EP89308322 A EP 89308322A EP 89308322 A EP89308322 A EP 89308322A EP 0361665 A3 EP0361665 A3 EP 0361665A3
Authority
EP
European Patent Office
Prior art keywords
lamp
frequency
power circuit
oscillation
current
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.)
Withdrawn
Application number
EP89308322A
Other languages
German (de)
French (fr)
Other versions
EP0361665A2 (en
Inventor
Michael Everton Denton
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.)
Marconi Electronic Devices Ltd
Original Assignee
Marconi Electronic Devices 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 Marconi Electronic Devices Ltd filed Critical Marconi Electronic Devices Ltd
Publication of EP0361665A2 publication Critical patent/EP0361665A2/en
Publication of EP0361665A3 publication Critical patent/EP0361665A3/en
Withdrawn legal-status Critical Current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
    • H05B41/288—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 without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
    • H05B41/292—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2921—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
    • H05B41/2925—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against abnormal lamp operating conditions

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

A power circuit for a low pressure sodium lamp utilises a high frequency oscillator which delivers a constant current to the lamp and which has a frequency of oscillation which is largely independent of variations in the impedance of the lamp. Sodium lamps have negative temperature-resistance coefficient, and the effect of the circuit is to counteract any tendency for the current taken by the lamp to increase as it heats up during operation. An additional inductance is provided between the oscillator itself and the lamp acts to stabilise the frequency of oscillation and hold constant the current delivered to the lamp.
EP89308322A 1988-09-28 1989-08-16 Power circuit Withdrawn EP0361665A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8822781 1988-09-28
GB888822781A GB8822781D0 (en) 1988-09-28 1988-09-28 Power circuit

Publications (2)

Publication Number Publication Date
EP0361665A2 EP0361665A2 (en) 1990-04-04
EP0361665A3 true EP0361665A3 (en) 1990-05-30

Family

ID=10644396

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89308322A Withdrawn EP0361665A3 (en) 1988-09-28 1989-08-16 Power circuit

Country Status (2)

Country Link
EP (1) EP0361665A3 (en)
GB (2) GB8822781D0 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI100759B (en) * 1989-12-29 1998-02-13 Zumtobel Ag Method and ballast device for attenuating fluorescent lamps
DE4015400A1 (en) * 1990-05-14 1991-11-21 Hella Kg Hueck & Co Starter circuit for vehicle gas discharge lamp - has resonator circuit with limiting action and including two inductances and capacitor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2057795A (en) * 1979-08-07 1981-04-01 Eleco Ltd Improvements in or relating to operating circuits for electric discharge lamps
US4358712A (en) * 1980-12-29 1982-11-09 Altex Scientific, Inc. Discharge lamp ballast
US4554487A (en) * 1983-05-17 1985-11-19 Nilssen Ole K Electronic fluorescent lamp ballast with overload protection
US4608523A (en) * 1984-01-16 1986-08-26 Nilssen Ole K Phase correction for series-resonant ballasts
GB2178607A (en) * 1985-07-25 1987-02-11 Matsushita Electric Works Ltd Discharge lamp driving circuit

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL145431B (en) * 1964-05-30 1975-03-17 Philips Nv CIRCUIT FOR FEEDING A GAS DISCHARGE TUBE.
US4277728A (en) * 1978-05-08 1981-07-07 Stevens Luminoptics Power supply for a high intensity discharge or fluorescent lamp
GB2172451B (en) * 1985-02-07 1989-06-14 El Co Villamos Keszulekek Es S Circuit system for igniting and lighting a high-pressure discharge lamp particulary a sodium vapour lamp

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2057795A (en) * 1979-08-07 1981-04-01 Eleco Ltd Improvements in or relating to operating circuits for electric discharge lamps
US4358712A (en) * 1980-12-29 1982-11-09 Altex Scientific, Inc. Discharge lamp ballast
US4554487A (en) * 1983-05-17 1985-11-19 Nilssen Ole K Electronic fluorescent lamp ballast with overload protection
US4608523A (en) * 1984-01-16 1986-08-26 Nilssen Ole K Phase correction for series-resonant ballasts
GB2178607A (en) * 1985-07-25 1987-02-11 Matsushita Electric Works Ltd Discharge lamp driving circuit

Also Published As

Publication number Publication date
GB8918671D0 (en) 1989-09-27
GB8822781D0 (en) 1988-11-02
EP0361665A2 (en) 1990-04-04
GB2223367A (en) 1990-04-04

Similar Documents

Publication Publication Date Title
WO2006020854A3 (en) Ballast power supply
AU2849099A (en) Probe for skin high frequency treatment
NO911547D0 (en) PROCEDURE AND DEVICE FOR AUTOMATICALLY ADJUSTING THE OUTPUT POWER FOR A TRANSMITTER.
IT1277866B1 (en) APPARATUS AND PROCEDURE FOR MINIMIZING THE SWITCH-ON TIME OF A RECEIVER OPERATING IN DISCONTINUOUS MODE.
ES8500515A1 (en) RF Laser power supply.
AU3633289A (en) Sublimation method
WO1998013939A3 (en) Control of a voltage controlled oscillator
ES2152945T3 (en) OSCILLATOR FOR A FREQUENCY OF 1.6 TO 3 GHZ.
HUP9901854A2 (en) Inductive tuners for microwave driven discharge lamps
EP0361665A3 (en) Power circuit
CA2253468A1 (en) Universal high intensity discharge (hid) electronic starter
EP0989785A3 (en) Circuit improvement for low pressure discharge lamp
EA199800723A1 (en) DEVICE FOR ISOLATION OF COMPONENTS FROM BASIC MATERIAL
EP0829731A3 (en) Ultra high reliability electrical contacts
EP0778722A3 (en) Electrodeless lamp starting/operation with sources at different frequencies
ES2185741T3 (en) SUPPLY CIRCUIT FOR GAS DISCHARGE LAMP.
KR900008182B1 (en) Variable frequency oscillator
JPS54145037A (en) High-frequency heater
JPS6439786A (en) Q-switch laser device
CN2265030Y (en) Small quartz oscillator
JPS5356737A (en) High-frequency heater
DE3267625D1 (en) Electronic amplifier with variable voltage-controlled gain, in particular an expander
NL7710923A (en) Solid state microwave power source for electrodeless light source - has impedance matching section with transmission line to match impedance during warm up and running of lamp avoiding excessive voltage
EP0066860A3 (en) A temperature-controlled, metal-vapor discharge lamp
WO1998022973A3 (en) Lampholder and lighting unit comprising a lampholder

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE NL

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE NL

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19901201