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Current-fed Push-Pull type high frequency resonant inverter for wax-sealing
원재선(Jae-Sun Won),김동희(Dong-Hee Kim),노채균(Chae-Cyun Ro),김민희(Min-Huei Kim) 한국조명·전기설비학회 2000 한국조명·전기설비학회 학술대회논문집 Vol.2000 No.-
This paper describes a double-ended current fed push-pull type 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 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 value from theoretical analysis. The theoretical analysis is proved through experiment and this circuit shows that it can be used practically as the power supply system for wax-sealing and DC-DC converter.
Don-Ha Hwang,Dong-Sik Kang,Yong-Joo Kim Tae-Hoon Lim,Sung-Woo Bae,Dong-Hee Kim,Chae-Cyun Ro 전력전자학회 2003 JOURNAL OF POWER ELECTRONICS Vol.3 No.3
The winding insulation of low-voltage induction motors in adjustable-speed drive system with voltage-fed Inverters is substantially stressed due to the uneven voltage distribution and excessive voltage stress (dv/dt), which result in the premature insulation breakdown In this paper, the detailed insulation test results of 26 low-voltage induction motors are presented. Six different types of insulation techniques are applied to 26 motors. The insulation characteristics are analyzed with partial discharge, discharge inception voltage, AC current, and dissipation factor tests Also, insulation breakdown tests by high voltage pulses are performed, and the corresponding breakdown voltages obtained.