H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 41/28 (2006.01) H05B 41/29 (1990.01) H02M 7/538 (2006.01)
Patent
CA 2083011
PHA 21.688 28.10.1992 ABSTRACT: Low harmonic compact fluorescent lamp ballast. A high frequency electronic ballast for a discharge lamp (20) includes an LC filter (5) and a voltage doubler circuit (8) coupling AC input terminals (1, 2) to DC input terminals (13, 14) of a half bridge DC/AC converter circuit (15). One end of the lamp is coupled to the capacitors (16, 17) of the voltage doubler circuit via a coupling capacitor (21) and the voltage doubler diodes (11, 12) and the other end of the lamp is coupled via an LC circuit (24, 25 and 26) to a junction point (22) between first and second switching transistors (18, 19) of the half bridge circuit. A capacitor (31) in parallel with the lamp forms part of a resonant circuit including the lamp and the LC circuit so that the half bridge circuit will oscillate at a high frequency. Energy is fed back to the voltage doubler capacitors via the coupling capacitor and the LC circuit to maintain the capacitor voltage above the peak of the AC supply voltage and thereby provide a circuit with a high power factor and low harmonic line current.
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Koninklijke Philips Electronics N.v.
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