Alternating current fan control circuit
A technology of control circuit and rectifier circuit, applied in the field of electronics, can solve the problems of unstable DC voltage, unbalanced current output of fan drive circuit, unstable power supply, etc., to achieve the effect of stable and reliable power supply
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[0021] The present invention is described in detail below in conjunction with accompanying drawing:
[0022] Please refer to figure 1 , The AC fan control circuit according to the embodiment of the present invention includes a rectifier circuit, a filter circuit, an electromagnetic interference circuit, a DC-DC switch circuit, and a fan drive circuit.
[0023] Wherein, the rectification circuit is used to transform the AC power of the power grid into a pulsating DC power supply; the rectification circuit in this embodiment adopts a rectification bridge BD composed of four diodes, which may also be a rectification bridge block.
[0024] Wherein, the filter circuit is arranged at the output stage of the rectifier circuit, and is used to filter out the harmonic voltage generated by the rectifier circuit. The filter circuit in this embodiment adopts an LC type filter circuit, including the output The first capacitor C1 of the stage, and the third inductor L3 connected in series a...
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