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3상 3스위치 PWM 전류원 정류기를 이용한 고역률 단조용 유도가열 전원 장치
고무석(Moo-Seok Goh),최승수(Seung-Soo Choi),김인동(In-Dong Kim) 대한전기학회 2021 전기학회논문지 Vol.70 No.3
Induction heating can convert electrical energy to thermal energy with high conversion efficiency and quick heating. Currently, a current source rectifier/inverter-fed parallel resonant circuit is widely used as an induction heating power supply for forging applications. Conventional induction heating power supplies have low power factor characteristics and high input power current THD characteristics, or have disadvantages of complicated control and high price. In this paper, we propose an induction heating power supply using a three-phase three-switch PWM rectifier to compensate for the above-mentioned shortcomings. The power factor of the input stage is kept close to 1, and the DC link current is uniformly well controlled regardless of fluctuations in the load voltage. In addition, through the SOGI PLL & FLL control algorithm, the current source inverter tracks the frequency and phase of the load resonance voltage well. The prototype of the induction heating power supply is designed and manufactured with a rated power of 40 kW and its characteristics and performances are confirmed through the experimental results. The proposed induction heating power supply using the three-phase three-switch PWM rectifier is expected to be widely used in the forging applications.
전류원 PWM 정류기 / 인버터를 이용한 새로운 단조용 유도가열 전원장치의 제어회로 설계
최승수(Seung-Soo Choi),고무석(Moo-Seok Goh),김인동(In-Dong Kim) 대한전기학회 2019 전기학회논문지 Vol.68 No.8
The conventional thyristor current source rectifier/inverter-fed parallel resonant circuit widely used for induction heating of forging applications has low power factor and high THD at the input side. Because of these disadvantage the IGBT PWM current source rectifier and inverter has been recently studied as an induction heating power supply topology. Therefore, this paper proposes the design method of power factor controller, the new detecting method of current and voltage for use in system control, and also the technique to follow the resonance voltage of the tank circuit for inverter switching. The proposed techniques are implemented in a 40㎸A induction heating power supply and its performances are verified through experiments. It is expected to be used extensively in induction heating power supply systems for forging with wide power range.