LED dimming circuit for suppressing voice frequency noise
A technology of dimming circuit, audio noise, applied in the direction of lamp circuit layout, light source, electric light source, etc.
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[0051] Below in conjunction with accompanying drawing, preferred embodiment of the present invention is described in further detail:
[0052] combine image 3 , an LED dimming circuit for suppressing audio noise, comprising a drive circuit and a switch circuit, the drive circuit comprising a demagnetization detection module, a logic circuit connected to the demagnetization detection module, and a MOS transistor M1 connected to the logic circuit through a gate And the comparator connected to the input terminal of the logic circuit through the output terminal; the switch circuit includes a sampling resistor R connected to the source of the MOS transistor M1 and the input terminal of the comparator at the same time SENSE , connect the sampling resistor R SENSE The inductance L at the input end, the capacitance C connected to the output end of the inductance L OUT and connecting the sampling resistor R SENSE output and the capacitor C OUT output diode D1, the capacitor C OUT ...
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