Patent ID: 8716951
Filing Date: 2014-05-06
Classification: H05B,Y02B

Abstract:
1. An illumination controlling circuit, coupled between a household electricity input and an illumination lamp, the illumination controlling circuit comprising: a dimming module, coupled with the household electricity input, configured for modulating an alternating current input signal from the household electricity input and generating a dimming signal, the dimming signal comprising a plurality of waveform pulses; a sampling-and-holding circuit, coupled with the dimming module, configured for continuously sampling the waveform pulses of the dimming signal to obtain an average waveform pulse from sampled waveform pulses; a differential circuit, coupled with the sampling-and-holding circuit, configured for extracting a voltage difference of the average waveform pulse; an integrator circuit, coupled with the differential circuit, configured for performing integration on the average waveform pulse according to the voltage difference, so as to generate a direct current voltage signal; and a voltage-clamping circuit, coupled between the integrator circuit and the illumination lamp, having a threshold voltage level, the voltage-clamping circuit applying the direct current voltage signal to the illumination lamp so as to light up the illumination lamp when a level of the direct current voltage signal exceeds the threshold voltage level of the clamping circuit.