Patent ID: 7764024
Filing Date: 2010-07-27
Classification: H05B

Abstract:
1. A piezoelectric transformer module for driving a first light source having a first end and a second end, and for driving a second light source having a third end and a fourth end, the second end connecting to the fourth end, the piezoelectric transformer module, comprising: a first piezoelectric transformer for transforming a supply voltage signal into a first driving voltage signal to the first light source, wherein the first piezoelectric transformer comprises a first terminal, a second terminal, and a third terminal, and wherein the third terminal is connected to the first end of the first light source; a second piezoelectric transformer for transforming the supply voltage signal into a second driving voltage signal to the second light source, wherein the second piezoelectric transformer comprises a fourth terminal, a fifth terminal, and a sixth terminal, and wherein the sixth terminal is connected to the third end of the second light source; and a resonance balance circuit having a primary winding directly connected to the first and the second piezoelectric transformers, and a secondary winding for outputting a feedback signal in response to a current flowing through the primary winding to vary the supply voltage signal, wherein the primary winding comprises two ends, wherein one of the two ends is connected directly to the second terminal of the first piezoelectric transformer and the other end is connected directly to the fourth terminal of the second piezoelectric transformer.