Lamp ballast circuit characterized by a single resonant frequency substantially greater than the fundamental frequency of the inverter output signal
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United States of America Patent
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-
Nov 11, 1997
Grant Date -
N/A
app pub date -
Jun 5, 1995
filing date -
Aug 20, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A lamp driving circuit having a series inductor and capacitor (L-C) in which the lamp load is connected in parallel with the capacitor. During pre-ignition of the lamp load, the driving signal supplied by a half-bridge oscillator includes a fundamental frequency and higher odd harmonics including a third harmonic of the fundamental frequency. The resonant frequency of the series connected L-C circuit is at least .sqroot.5 times greater than the fundamental frequency but not equal to the higher odd harmonic frequencies, preferably less than the third harmonic of the driving signal.
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