There is provided a lighting control circuit comprising a duty cycle detection circuit, an averaging circuit, a waveform generator and a comparator circuit. The duty cycle detection circuit generates a first periodic waveform having a duty cycle and frequency corresponding to an input waveform duty cycle and frequency. The averaging circuit generates a first signal having a voltage level corresponding to the duty cycle of the first periodic waveform. The waveform generator outputs a second periodic waveform having a frequency different from the input waveform frequency. The comparator circuit compares the second periodic waveform with the first signal to generate an output waveform having a duty cycle corresponding to the input waveform duty cycle and a frequency corresponding to the frequency of the second periodic waveform. Also, there are provided methods.
申请公布号
WO2009094328(A2)
申请公布日期
2009.07.30
申请号
WO2009US31425
申请日期
2009.01.20
申请人
CREE LED LIGHTING SOLUTIONS, INC.;MYERS, PETER, JAY;HARRIS, MICHAEL;GIVEN, TERRY