Electronic reactor for the supply of discharge lamps with an oscillator circuit to limit the crest factor and to correct the power factor
First Claim
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1. Electronic reactor, or ballast, for a discharge lamp (L), comprising:
- a bridge rectifier (5) connected to an alternating voltage source (3);
a half-bridge with two controlled switching means (11,
13) made alternately conducting to connect the said lamp (L) and the said bridge rectifier (5);
a resonant load circuit (17) connected to the said half-bridge (11,
13) and including the said lamp (L); and
a smoothing capacitor (29) connected in parallel with the half-bridge (11,
13);
and wherein an auxiliary resonant circuit (33) is connected between the output (19) of the half-bridge (11,13) and the positive pole (5A) of the bridge rectifier (5).
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Abstract
The electronic reactor for discharge lamps (L) comprises a bridge rectifier (5) connected to an alternating voltage source (3); a half-bridge with two controlled switching means (11, 13) made alternately conducting to connect the said lamp (L) and the said bridge rectifier (5); a resonant load circuit (17) connected to the said half-bridge (11, 13); and a smoothing capacitor (29) connected in parallel with the half-bridge (11, 13). An auxiliary resonant circuit (33) is provided to reduce the crest factor and correct the power factor between the output (19) of the half-bridge (11, 13) and the positive pole (5A) of the bridge rectifier (5).
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Citations
10 Claims
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1. Electronic reactor, or ballast, for a discharge lamp (L), comprising:
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a bridge rectifier (5) connected to an alternating voltage source (3); a half-bridge with two controlled switching means (11,
13) made alternately conducting to connect the said lamp (L) and the said bridge rectifier (5);a resonant load circuit (17) connected to the said half-bridge (11,
13) and including the said lamp (L); anda smoothing capacitor (29) connected in parallel with the half-bridge (11,
13);and wherein an auxiliary resonant circuit (33) is connected between the output (19) of the half-bridge (11,13) and the positive pole (5A) of the bridge rectifier (5). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification