Electric lamp and discharge devices: systems – Pulsating or a.c. supply – With power factor control device
Patent
1995-04-19
1997-12-02
Pascal, Robert
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
With power factor control device
315224, 315307, 315DIG5, H05B 3702
Patent
active
056940076
ABSTRACT:
A discharge lighting system includes a lighting server responsive to input power for controlling the operation of discharge lamps. An inverter in the server includes a full switching bridge having a first leg and a second leg operable at a common switching frequency but out of phase to provide for pulse width modulation and frequency variations to dim the discharge lamps. A protection circuit is provided to reduce the circulating currents resulting from an open-circuit condition. A power factor circuit includes an output capacitor which is maintained fully charged while the switching circuits are de-energized to extinguish the lamps. The charged condition of the capacitor avoids high in-rush currents when the lamps are again illuminated by activation of the switching circuit. A first tank circuit included in the inverter has a first resonant frequency which is greater than the switching frequency of the switching members. A second tank circuit associated with the lamp ballast has a second resonant frequency less than the switching frequency of the switching members.
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Myers Richard L.
Pascal Robert
Systems and Services International, Inc.
Vu David
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