Stroboflash-free active power factor correcting circuit applied to LED drive
A technology for driving and correcting circuits for LEDs, which is applied to the layout of electric lamp circuits, conversion devices for output power, light sources, etc. It can solve problems such as complex structures and high production costs, and achieve the effects of simplified circuits, low-voltage breakdown, and wide application range
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[0024] The present invention will be further described below in conjunction with accompanying drawing and embodiment:
[0025] A flicker-free active power factor correction circuit applied to LED driving: in an isolated circuit structure:
[0026] see Figure 4~5 As shown, it includes rectifier circuit, filter capacitor, first stage inductor L2, control chip, power tube Q3, transformer T3, energy storage capacitor C7, first switch tube D7, second switch tube D8 and LED load circuit, the first stage One end of the inductor L2 is connected to the positive output terminal of the bridge rectifier circuit, and the other end is connected to the drain of the power transistor Q3 and the positive electrode of the energy storage capacitor C7; the transformer T3 includes two coils, primary and secondary, and one end of the primary coil LP3 of the transformer T3 passes through the inductor current The sampling resistor R7 is connected to the source of the power tube Q3, the other end of ...
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