Patent ID: 9055626
Filing Date: 2015-06-09
Classification: H05B

Abstract:
1. A dimmer circuit, comprising: a dimmer coupled to an alternating current (AC) for modulating the AC into an AC light modulating signal, wherein the AC light modulating signal contains a plurality of wave pulses each having a conduction angle; a rectifier coupling the dimmer and the AC for converting the AC light modulating signal into a direct current (DC) light modulating signal having a plurality of positive wave pulses; a sample-and-hold unit coupled to the rectifier for continuously sampling the positive wave pulses of the DC light modulating signal to obtain an average positive wave pulse; an integral unit coupled to the sample-and-hold unit for integrating the average positive wave pulse to generate a DC voltage; and a current holding circuit, wherein one end of the current holding circuit is coupled to the sample-and-hold unit and the rectifier, the other end of the current holding circuit is coupled to the integral unit, and the current holding circuit comprises: wherein, the current holding circuit determines on state or off state of the switch according to a comparison between the DC voltage and a reference voltage, such that the DC light modulating signal passes through the bleeder or the switch.