High frequency switching power supply adopting soft switching technology, which has reliable high efficiency and long use time performances becomes the important part of DC power system.

基于软开关技术的高频开关电源因其性能可靠、效率高、寿命长等优点，成为了现代电力操作电源系统中的重要组成部分。

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For the use of off-line switching mode power supply IC, an internal power supply circuit combining with a high voltage startup current source is proposed.

结合高压启动恒流源设计了一种用于离线式开关电源的内部电源电路。

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