Electronic ballast for a discharge lamp

Details Electronic ballast for a discharge lamp Electronic ballast for a discharge lamp

H - Electricity

05

B

315/54

H05B 41/24 (2006.01) H05B 41/282 (2006.01) H05B 41/392 (2006.01)

Patent

CA 1188725

Abstract An electronic ballast for a dicharge lamp (8) for restricting and stabilizing a current, said ballast comprising a high frequency oscillator connented to a source of direct current, said oscillator consisting of two series connected transistors (1, 2), a base drive transformer (3) connected there between and bringing transistors (1, 2) into alternating phase operation, an inductor (7) connected in series with the primary winding (4) of a transformer (3), and a resonance capacitor (10, 11) in the latter series circuit between a lamp (8) and a source of current, as well as a filtering capacitor connected between the terminals of a source of direct current and having high charging ability. An object is to reduce the radio interference level produced by a ballast and on the other hand to reduce RMS value of the ripple current of a filtering capacitor as well as the switching losses of transistors. This is achieved by connecting one (8a) of the electrodes of lamp (8) by way of resonance capacitors (10 and 11) to each opposite terminal of said source of current. The circuit solution further includes diodes (23, 24) connected parallel to capacitors (10, 11) for stable circuit operation despite the negative resistance on the part of a lamp.

411690

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