INVERTER CIRCUIT FOR SCANNING BACKLIGHT

摘要

An inverter circuit for a scanning backlight is provided to reduce the number of switches to a half in comparison with a conventional full bridge circuit by basically using a half bridge circuit driven by two switches and constituting a full bridge circuit with the other half bridge circuit. In an inverter circuit for a scanning backlight, a half bridge circuit(10) has two switching devices(11,13) connected in series. A first side of a transformer(Np) and a capacitor(Cb) are serially connected to intermediate points(A,B,C,D,E) between the two switching devices. The half bridge circuits are connected to DC power(Vi) in parallel as many as the division number of a light source. Each half bridge circuit is used two times during the whole cycle. The half bridge circuit is used once as a lead leg and once as a lag leg.