Electronic ballast with power factor correction

摘要

According to an exemplary implementation, an electronic ballast includes an input filter coupled to a resonant tank. The resonant tank is configured to generate a resonant current. The input filter is configured to receive an AC input voltage and to generate an AC input current from the resonant current by smoothing the resonant current. The electronic ballast also includes a half-bridge configured to feed the resonant tank so as to generate the resonant current and to receive a supply voltage that is in phase with the AC input voltage. The electronic ballast can also include a controller configured to control a power factor of the electronic ballast by switching the half-bridge. The controller can be configured to adjust a shape of the AC input current by adjusting switching of the half-bridge to thereby adjust a power factor of the electronic ballast.

主权项

1. An electronic ballast comprising:
an input filter coupled to a resonant tank, said resonant tank configured to generate a resonant current; said input filter configured to receive an AC input voltage and to generate an AC input current from said resonant current by smoothing said resonant current; a half-bridge configured to feed said resonant tank so as to generate said resonant current and to receive a supply voltage provided through use of a bus capacitor coupled between a high side bus and a low side bus of said half-bridge, said supply voltage being substantially in phase with said AC input voltage; said electronic ballast not using a power factor correction circuit.