Electronic Ballast Circuit For Lamps

摘要

An electronic ballast circuit includes a power factor correction circuit, a control and amplifier circuit, a ballast controller circuit and a ballast driver circuit. The ballast driver circuit includes a resonant circuit that connects to a lamp and a strike voltage limiter circuit that regulates the behavior of the resonant circuit. An overcurrent sensor circuit may be included to indirectly the control the ballast controller circuit via the control and amplifier circuit. The strike voltage limiter circuit uses varistors to change the resonant frequency of the resonant circuit to limit the voltage to the lamp.

主权项

1. An electronic ballast circuit comprising:
a ballast controller circuit configured to output at least one drive signal; a power factor correction circuit outputting a current sense signal reflective of a voltage; a control and amplifier circuit configured to receive said current sense signal, provide a power correction feedback signal to the power factor correction circuit, and provide one or more control signals to control the ballast controller circuit; a ballast driver circuit configured to receive said at least one drive signal from the ballast controller circuit, the ballast driver circuit comprising:
a resonant circuit that is connectable to a lamp; anda voltage limiter circuit configured to regulate behavior of the resonant circuit; and an overcurrent sensor circuit configured to output an overcurrent signal to control the ballast controller circuit.