LED illumination dimming circuit and LED illumination dimming method

摘要

PROBLEM TO BE SOLVED: To provide an LED lighting dimming circuit capable of continuously controlling linear dimming without stopping oscillation of an LED current to zero ampere.SOLUTION: An energy balance circuit of LED lighting dimming circuit turns a switch circuit for balance off in a period when a control switch element is turned on, and turns the switch circuit for balance on when a control voltage according to a current flowing through a second coil goes above a preset threshold voltage for balance, while turns the switch for balance off when the control voltage is less than the threshold voltage for balance, in a period when the control switch element is turned off.SELECTED DRAWING: Figure 1