With the temperature and environment change,the equivalent parameters and inherent resonant frequency of the inverter load also change,which leads to reducing the efficiency of the inverter,increasing output ripple coefficient and the stress of the power switching devices.The paper adopted Analogue Phase Locked Loop technique to realize frequency automatic tracking,analyzed the principal and characteristic of PLL in detail,set up the model and simulated with Pspice software,then designed the circuit and mad...
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