感应加热电源PDM-PSM复合功率控制策略研究

PDM-PSM Hybrid Power Control of a Series-Resonant Inverter for Induction Heating Applications

提出了一种负载串联谐振感应加热电源的脉冲密度-移相复合调制(Pulse Density Modulation-Phase ShiftMmodulation,简称PDM-PSM)功率控制策略,逆变器承担逆变和功率调节两个任务,并始终工作在负载谐振状态,开关管工作在零电流或零电压开关状态。采用该控制策略的逆变器,功率调节范围宽,与采用脉冲密度调制的逆变器相比,具有输出电流平稳、电流连续、功率调节连续等优点;与单独采用移相控制的逆变器相比,具有移相角小,输出电流基本无畸变等优点。

This paper presents a high-frequency series-resonant inverter for induction heating applications,which is characterized by the Pulse-Density-Mmodulation （PDM） and Phase-Shift-Modulation （PSM） hybrid power control strategy. The inverter is kept to work at load resonant state for all load conditions and achieves Zero Current Switching （ZCS） or Zero voltage Switching （ZVS） for switches of the inverter,when compared with PDM only schemed inverters,it achieves more steady output current,continuous power regulation,and operating in Continuous Current Mode （CCM） ,When compared with PSM only schemed inverters,it achieves smaller phase-shift as well as hardly any distortion in output current. Even working under light load status,the inverter can realize quasi-sinusoid output current waveform with less fluctuation in peak value.