Switching power supply and control circuit thereof
A switching power supply, control circuit technology, applied in control/regulation systems, high-efficiency power electronic conversion, electrical components, etc., can solve the problem of high total harmonic distortion of switching power supply, achieve strong versatility, reduce total harmonic distortion, The effect of simplifying the structure
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[0046] The high-order harmonics generated by the switching power supply will generate conduction interference and radiation interference along the transmission line of the power grid, thereby polluting the power supply system and affecting the normal operation of other electrical equipment on the road. Therefore, whether from the perspective of protecting the safe operation of the power grid or the normal operation of electrical equipment, reducing the pollution of harmonics to the power grid and suppressing electromagnetic interference has become a common concern in the industry. The reason for the high-order harmonics generated by the switching power supply is mainly the waveform distortion of the AC input current caused by the capacitive filter bridge rectifier circuit commonly used in the switching power supply.
[0047] figure 2 Although the switching power supply shown has added a valley filling circuit 20, its total harmonic distortion still cannot meet the requirement...
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