基于非对称电压控制的感应加热设备的分析-analysis of induction heating equipment based on asymmetric voltage control.docx

ABSTRACTIn recent years, induction heating appliances are popularly used because of its safety, economy, cleanliness, and high efficiency. Two-output series resonant inverter is developed very rapidly. Two-output induction heating appliances are suitable for using two-output inverter. Some traditional approaches use several single-output inverters or a single-output inverter multiplexing the loads along the time periodically. Based on analysis of a two-output series-resonant high-frequency inverter, a new inverter is adopted fulfilling the requirements. The inverter can be considered as a two-output extension of a full-bridge topology. It allows the control of the two outputs, simultaneously and independently, up to their rated powers. Compared with the two-converter, the proposed inverter saves the number of components and provides a higher utilization of electronics.Firstly, two kinds of topology of the inverter are compared in this paper, the series resonant inverter is chosen as the topology map. For the series resonant inverter, the paper studies the common DC side and AC side power adjustment methods and selects asymmetrical voltage-cancellation control. Then its principle was introduced in detail.Secondly, the structural features of two-output series resonant inverter, including its operation modes and output waveforms, are analyzed. Simulation results based on Matlab/Simulink verify the validity of above analysis. To decrease the losses of IGBT, snubber capacitors are introduced. Moreover, power loss and the output power of the loads are calculated in the paper.Finally, a control circuit is designed for the relationship of output power and phase-shifting angle. In the control circuit, every trigger signal is derived by comparing a ramp signal and the output power of the load. To verify the validity of the strategy, modeling and simulation in Matlab/Simulink is proposed.KEY WORDS ： induction heating, asymmetrical voltage-cancellation control, two-output