Abstract：Tracking the resonant frequency and adjusting output power are the key in full-bridge series load-resonant-inverter. In this paper, a new method of frequency tracking and output power control based on the mean-value of DC bus current polarity is proposed. The relationships between the DC bus current, load parameters, phase-shifted angle and the operation frequency are analyzed in detail under six modes of inverter. The expression of the mean-value of DC bus current polarity on load parameters, phase-shifted angle, operation frequency and formula of output power are given also. Because the maximum mean-value of DC bus current polarity corresponded to resonant frequency when the phase-shifted angle of the inverter is equal to zero, the inverter resonant frequency can be obtained by setting the phase-shift angle to zero periodically. The inverter output power varies with phase-shifted angle at the point of resonant frequency, so the inverter phase-shifted angle could be regulated using PI controller by the error between the reference value and the output power mean-value. The simulation and experimental results reveal that proposed method can well achieves tracking the resonant frequency and output power control of the full-bridge series load-resonant-inverter.
李宏, 贺昱曜, 王崇武. 一种全桥负载串联谐振逆变器谐振频率跟踪和输出功率控制方法[J]. 电工技术学报, 2010, 25(7): 93-99.
Li Hong, He Yuyao, Wang Chongwu. A New Method of Frequency Tracking and Output Power Control for Full Bridge Series Load Resonant Inverter. Transactions of China Electrotechnical Society, 2010, 25(7): 93-99.
2010, Vol. 25 
