Patent ID: 7839100
Filing Date: 2010-11-23
Classification: H05B

Abstract:
1. A front-stage voltage-adjustment inverter, which receives an input power and converts said input power into a driving power to drive at least one load, and which comprises: a rectifier unit receiving and rectifying said input power; a duty cycle modulation unit generating a cycle signal; a half-bridge driving unit driven by said cycle signal; and a transformer unit driven by said half-bridge driving unit to convert said input power into said driving power, wherein said inverter is coupled to a dimming signal source, and said inverter further comprises: a front-stage voltage-adjustment unit coupled to between said rectifier unit and said half-bridge driving unit, receiving said input power, determining a voltage-adjustment level according to a dimming signal, and according to said voltage-adjustment level, varying the voltage of said input power, which said half-bridge driving unit conducts to said transformer unit, to adjust the voltage of said driving power, which said transformer unit generates at a secondary side thereof; wherein a feedback unit is coupled to said secondary side of said transformer unit to generate a feedback signal, and said front-stage voltage-adjustment unit modifies the voltage of said input power to stabilize the voltage of said driving power according to said feedback signal.