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1. WO2000040063 - BALLAST CIRCUIT

Publication Number WO/2000/040063
Publication Date 06.07.2000
International Application No. PCT/EP1999/010226
International Filing Date 15.12.1999
IPC
H05B 41/282 2006.01
HELECTRICITY
05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
41Circuit arrangements or apparatus for igniting or operating discharge lamps
14Circuit arrangements
26in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
28using static converters
282with semiconductor devices
H05B 41/392 2006.01
HELECTRICITY
05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
41Circuit arrangements or apparatus for igniting or operating discharge lamps
14Circuit arrangements
36Controlling
38Controlling the intensity of light
39continuously
392using semiconductor devices, e.g. thyristor
CPC
H05B 41/2827
HELECTRICITY
05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
41Circuit arrangements or apparatus for igniting or operating discharge lamps
14Circuit arrangements
26in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
28using static converters
282with semiconductor devices
2825by means of a bridge converter in the final stage
2827using specially adapted components in the load circuit, e.g. feed-back transformers, piezo-electric transformers; using specially adapted load circuit configurations
H05B 41/3925
HELECTRICITY
05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
41Circuit arrangements or apparatus for igniting or operating discharge lamps
14Circuit arrangements
36Controlling
38Controlling the intensity of light
39continuously
392using semiconductor devices, e.g. thyristor
3921with possibility of light intensity variations
3925by frequency variation
Y02B 20/185
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
20Energy efficient lighting technologies
16Gas discharge lamps, e.g. fluorescent lamps, high intensity discharge lamps [HID] or molecular radiators
18Low pressure and fluorescent lamps
183Specially adapted circuits
185Self-resonant bridges
Applicants
  • KONINKLIJKE PHILIPS ELECTRONICS N.V. [NL/NL]; Groenewoudseweg 1 NL-5621 BA Eindhoven, NL
Inventors
  • CHANG, Chin, W.; NL
Agents
  • BOSMA, Rudolphus, H., A.; Internationaal Octrooibureau B.V. Prof. Holstlaan 6 NL-5656 AA Eindhoven, NL
Priority Data
09/221,95328.12.1998US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) BALLAST CIRCUIT
(FR) CIRCUIT DE BALLAST
Abstract
(EN)
Lamp voltage or current obtained from a self-oscillating converter is stabilized by a feedback circuit. Gates of the switching transistors are connected to output windings of a current transformer whose input current winding is in series with the resonant load lamp circuit. The lamp voltage or current is sensed, and the resulting signal is used to control current through an auxiliary control winding on the current transformer. Preferably, two opposite conductivity type control transistors are connected in parallel across the control winding, and low-pass filtered DC signals corresponding to the lamp voltage bias the control transistors.
(FR)
On stabilise la tension ou l'intensité d'une lampe fournie par un convertisseur auto-oscillant au moyen d'un circuit de rétroaction. Les portes des transistors de commutation sont reliés aux enroulements de sortie d'un transformateur de courant dont les enroulements d'entrée sont disposés en série avec le circuit résonant de lampe de charge. Le signal résultant de la tension ou de l'intensité captée de la lampe sert à commander le courant au travers d'un enroulement de commande auxiliaire sur le transformateur de courant. On trouve de préférence deux transistors de commande à conductivité opposée, connectés en parallèle avec l'enroulement, qui sont soumis à une tension de polarisation par des signaux en courant continu à filtre passe bas correspondant à la tension de la lampe.
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