Light-emitting diode (LED) driving system
A technology of LED driving, rectifying and filtering circuit, applied in the field of LED lighting, can solve the problems of difficult to realize driving circuit, inability to miniaturize, complicated circuit, etc., and achieve the effect of reducing EMI radiation, simple circuit and high power factor
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[0028] The specific embodiment of the present invention discloses an LED driving system, including:
[0029] Rectifier filter circuit;
[0030] A voltage conversion circuit connected to the rectification filter circuit, the voltage conversion circuit having a primary winding, a first secondary winding, and a second secondary winding, the primary winding receives the output voltage of the rectification filter circuit, the first The secondary winding outputs a secondary current to the LED load;
[0031] A first switch, the first switch is a power MOS tube, the drain of which is connected to the primary winding;
[0032] A primary-side sampling network, which is connected to the source of the first switch and generates a primary induced voltage when the first switch is turned on;
[0033] A driving pulse generating module, which generates a switch signal to control the gate voltage of the first switch;
[0034] A zero-crossing detection module, the input terminal of which is connected to t...
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