Current-fed push-pull type high frequency resonant inverter for wax-sealing

This paper describes a double-ended current fed push-pull high frequency resonant inverter used as the power supply for wax-sealing. The proposed inverter can realize ZVS operation by using resonant capacitor to ZVS capacitor and has some merits not only reduction of switch current distribution but also extension of load range compare to the conventional single-ended current fed push-pull type high frequency resonant inverter. This analysis of the proposed circuit uses normalized parameter and characteristic estimation which is needed in each step before design is generally described according to normalized frequency (μ), normalized resistance (λ) and parameters. It is also presented as an example of method of the circuit design based on estimation analysis values from theoretical analysis. The theoretical analysis is proved through experiment and this circuit shows that it can used practically as the power supply system for wax-sealing and DC-DC converter