相比于固定开关频率正弦脉宽调制技术(constant switching frequency sinusoidal pulse width modulation,CSFSPWM),可变开关频率正弦脉宽调制(variable switching frequency sinusoidal pulse width modulation,VSFSPWM)技术可以在不增加额外硬件条件的情况下减少谐波和损耗.为了降低输出THD和改善系统时域特征,提出了一种反相正弦波无源变开关频率脉宽调制(inverse phase sine passive VSFSPWM,Isin-PVSFSPWM)技术.量化了电感电流谐波总畸变率(total harmonic distortion,THD)与Isin-P V SFSP WM 的关系.在时域上,分析计算了Isin-PVSFSPWM技术下开关损耗和电感电流纹波.而后搭建了一个1 kW单相全桥逆变实验平台.实验结果表明在适当的扩频范围内,Isin-PVSFSPWM方法可以降低电流电压THD和开关损耗.与CSFSPWM相比,Isin-PVSFSPWM技术下电感电流纹波的THD从26.22％降低到23.92％.输出电流THD从3.80％下降到3.01％.在注入深度D(0.4,1)下,Isin-PVSFSPWM的效率从93.69％提高到94.75％.
Application Analysis of Passive Variable Switching Frequency SPWM with Carrier Amplitude En-velope Line as Inverse-phase Sine in H-bridge Inverter
Compared to the constant switching frequency sinusoidal pulse width modulation(CSFSPWM),the variable switching frequency sinusoidal pulse width modulation(VSFSPWM)method can reduce harmonics and losses without adding additional hardware conditions.We proposed an inverse phase sine passive VSFSPWM(Isin-PVSFSPWM)tech-nology to reduce output total harmonic distortion(THD)and improve time domain characteristics.The relationship between output THD and Isin-PVSFSPWM was quantified.The switching loss and current ripple were analyzed under the Isin-PVSFSPWM method by time domain.Then,a 1-kW H-bridge inverter was built.Experimental results show that the Isin-PVSFSPWM method can be adopted to reduce losses and the output of THD within a suitable spread spectrum range.Compared to CSFSPWM,the THD of the inductor current ripple under the Isin-PVSFSPWM method decreases from 26.22％to 23.92％.The THD of the output current decreases from 3.80％to 3.01％.The efficiency of Isin-PVSFSPWM under D(0.4,1)increases from 93.69％to 94.75％.
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