In the switching power supply, because the power transistor works in the on-off state, when the switch speed is increased, it will be affected by the distributed inductance, capacitance component or the charge stored in the diode, which will generate large surge and noise. Its alternating voltage and current will generate strong peak interference and harmonic interference through the components in the circuit, which may Damage the components of the circuit, pollute the power grid, and affect the normal operation of the adjacent electronic instruments and equipment. Although some measures can be taken to reduce the interference to some extent, it is still difficult to use switching power supply in the current stage of precision electronic instruments. Therefore, to overcome all kinds of noise interference caused by switching power supply is the third problem we should strive to solve.<br>
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