传统的推挽变换器存在着一些固有的缺点，诸如开关管的电压应力高、难以实现软开关等，限制了它的应用范围。
There are some intrinsic drawbacks in traditional push-pull converter, such as higher voltage stress and hard-switching of the switches, so the application area of the converter is limited.
既要保持电压而在限制范围内的频率，需要良好的功率控制和负载调节。
To maintain both the voltage and the frequency within limits requires fine power control and load regulation.
既要保持电压而在限制范围内的频率，需要良好的功率控制和负载调节。
To maintain both the voltage and the frequency within limits requires fine power control and load regulation.
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