H - Electricity – 05 – B
Patent
H - Electricity
05
B
315/54, 321/56
H05B 37/00 (2006.01) H05B 41/28 (2006.01) H05B 41/298 (2006.01)
Patent
CA 1232938
PHA.21116 26 22-04-83 ABSTRACT: "High frequency oscillator-inverter ballast circuit for discharge lamps", A current fed high frequency oscillator-inverter ballast circuit includes a parallel resonant tank circuit for driving a pair of series connected discharge lamps via a series ballast capacitor. A regenerative power supply switches on when a fluctuating main DC supply voltage drops below a given level thereby providing a constant level auxiliary DC supply voltage to the oscillator inver- ter to maintain oscillation and lamp operation. When the main DC supply voltage exceeds said given level, the re- generative power supply switches out. The oscillation fre- quency is f2 during operation of the main supply and auto- matically switches to a frequency f1 when the regenerative power supply takes over. The frequency shift is automatic during each hal cycle of 50 to 60 Hz AC supply and is in a direction so as to maintain lamp current relatively con- stant. A novel high frequency leakage transformer is pro- vided to couple the high frequency inverter to the dis- charge lamp load to provide both a current limiting (bal- last) action and automatic control of the lamp heater cur- rent to maintain high efficiency operation.
428909
Fellows Mark W.
Steneck Walter G.
Stupp Edward H.
Koninklijke Philips Electronics N.v.
Van Steinburg C.e.
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