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Abstract
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.
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