超高频感应加热电源逆变器负载拓扑的研究

针对兆赫级超高频感应逆变器中器件开关损耗大和感应加热负载变化大等问题,引入了一种新颖的双管超高频谐振逆变器,该谐振逆变器能够很好地处理兆赫级逆变电源电路上的寄生电感和寄生电容对电路的影响,实现了开关管零电压关断、零电流零电压开通,能极大地减少开关管的开关损耗;分析了该拓扑在负载为感性、阻性、容性条件下逆变器的工作状态以及该拓扑在4种经典逆变器负载条件下零电压软开关的状态和范围。最后,以LLC逆变器负载设计了1 MHz谐振逆变器的样机。研究结果表明LLC逆变器负载更适合该谐振逆变器。

Research on ultra high frequency induction heating power supply inverter load topology

Aiming at the troublesome of the switching loss and induction heating load variation in ultra high frequency induction heating power supply inverter,a novel bi-switching ultra high frequency resonant inverter was introduced.In the circuit,the trail inductive and capacitive parasitic parameters can be absorbed.The zero-voltage turn-off and the zero-voltage,zero-current turn-on were realized,in which the switching loss of the switch tube can be reduced greatly.The working conditions of the topology in inductive,resistive and capacitive load were analyzed.At the same time,the scope and conditions of the zero-voltage soft-switching in four kinds of classical inverter load were researched.Simulation and experimental results operating around 1 MHz frequency were presented.The results indicate that LLC inverter load topology is the most suitable one for this inverter.