Patent ID: 8049438
Filing Date: 2011-11-01
Classification: H05B,Y02B

Abstract:
1. A driving circuit for driving a plurality of loads comprising: a switch circuit operable for converting a DC electric power to a first AC electric power; a transformer coupled to said switch circuit and operable for transforming said first AC electric power to a second AC electric power to power said plurality of loads; a current sensing circuit coupled to at least one of said plurality of loads and operable for generating a feedback signal indicative of a current flowing through said plurality of loads; and an inverter controller coupled to said switch circuit, operable for receiving a sensing signal indicative of a level of an input DC voltage, operable for generating an output signal inversely proportional to said sensing signal, operable for generating an error signal by comparing said feedback signal with a predetermined threshold, and operable for generating a pulse-width modulation (PWM) signal to control said first AC electric power, wherein said inverter controller generates said pulse-width modulation signal according to said output signal if said feedback signal is less than a predetermined threshold and according to said error signal if said feedback signal is greater than said predetermined threshold.