And then, we mainly discuss the peak current controlling mode and the sub-harmonic oscillation when the duty cycle exceeds 50%.
同时，着重分析了峰值电流控制模式下，由于电流扰动和占空比扰动导致系统在占空比大于50%情况下而出现次谐波振荡原因。
In the design of current-mode PWM DC-DC converters, the slope compensation method is widely used to prevent sub-harmonic oscillation.
设计电流模脉冲宽度调制直流转换器时，人们广泛采用斜坡补偿电路来消除谐波振荡。
Especially, the sub-harmonic oscillation of the low frequency inductor current is analyzed and the method to solve this problem is proposed.
分析了变换器低频电感电流的次谐波振荡问题，并提出了抑制措施，实验验证了理论分析的正确性。
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