The operating frequency of the inverter based on the resonant performance is fixed at the resonant frequency. Then, it is difficult to regulate the output voltage because the switch-on and -off time can not be set in an arbitrary manner. Therefore, the authors propose the control method of active use of the short-circuit mode to the voltage resonant type of push-pull high-frequency inverter circuit. The characteristics of the proposed inverter are carried out with analytical and experimental manner. The results of the theoretical steady-state analysis agree well with those in the experiment. The circuit efficiency is more than 90% in the wide control range.
Further, the inverter is applied to the lighting circuit of electric-discharge lamp. In the lighting circuit made on an experimental basis, the wide range of output control from 83 V to 113 V of the supply voltage and the stable lighting of electric-discharge lamp can be achieved. Then, the circuit efficiency can be obtained over 88%.
Thus, the proposed high-frequency inverter by using the short-circuit mode is proved to be of much practical use.
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