The Principle of the Formation of Voltage Spikes in the Flyback Power Switch
Flyback switching power supply in the switch off moment will appear high frequency and high amplitude voltage spike,if not dealt with will not only aggravate the electromagnetic interference,but also increase the voltage stress of the switch tube.Based on this,the principle of switching off voltage spike formation is explained in detail,the expression of spike voltage is derived,and the maximum value and steady state value of spike voltage can be calculated by using the simulation software MathCAD,which provides theoretical guidance for the selection of switching tubes and the design of spike absorbing circuits.
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