Patent ID: 6998797
Filing Date: 2006-02-14
Classification: H05B,Y10S

Abstract:
1. A device for adjusting currents of lamp tubes in a display, the lamp tubes comprising a first lamp tube with a first current and a second lamp tube with a second current, the device comprising: a feedback device for monitoring the first current and the second current, and outputting a feedback signal; a first switch positioned between the first lamp tube and the feedback device; a second switch positioned between the second lamp tube and the feedback device; a main control device, coupled to the feedback device, for outputting a driving voltage according to the feedback signal; a resonance circuit, coupled to the main control device, for outputting a controlling voltage signal according to the driving voltage; a transformer, coupled to the resonance circuit, for providing a second voltage to the first and second lamp tubes signal to generate the first and second currents according to the controlling voltage; and a low-frequency switch controller for turning on the first switch and the second switch at different times; wherein the feedback device receives the first current as the first switch is turned on, and the main control device adjusts the driving voltage according to the feedback signal so as to adjust the first current when the first current is not equal to a predetermined value.