In the switching power supply device, the power transistor operates in the on-off state, so when the switching speed increases, it is affected by the distribution inductance, the capacitance of the circuit or the charge stored in the diode to generate a large magnetic field and AC voltage. In addition, the current through the components of the circuit produces a strong peak interference and harmonic interference. This peak voltage or current will damage the components of the circuit, at the same time, it will also pollute the main power grid and affect the normal operation of peripheral electronic equipment and equipment. In order to reduce the influence of the interference, some measures can be taken to suppress the interference, but at this stage, it is still difficult to use the switching power supply device on the precision electronic equipment. Therefore, to overcome all kinds of noise interference in switching power supply device is the third problem to be solved.<br>
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