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| A New Method of Frequency Tracking and Output Power Control for Full Bridge Series Load Resonant Inverter |
| Li Hong, He Yuyao, Wang Chongwu |
| Northwestern Polytechnical University Xi’an 710072 China |
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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.
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Received: 22 October 2009
Published: 04 March 2014
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2010, Vol. 25 
