Piezoelectric resonant lamp-ignition circuit

摘要

The present invention discloses a piezoelectric resonant lamp-ignition circuit, which uses the intrinsic capacitors of a piezoelectric transformer as piezoelectric capacitors. One lamp is connected to one set of the piezoelectric capacitors. Several sets of the piezoelectric capacitors and a resonant inductor are paralleled or cascaded to form a parallel resonant lamp-ignition circuit or a cascade resonant lamp-ignition circuit. The lamp-ignition circuit of the present invention has advantages of low temperature, small leakage current, high voltage resistance and high lamp ignition efficiency. When applied to drive several lamps, the present invention uses a fixed frequency to attain a fixed inner impedance of the equivalent circuits of the piezoelectric capacitors. Thereby, the currents of the lamps are balanced to have an identical value.