基于PDM AVC功率控制串联谐振逆变器的研究

摘要

Considering inverter in series resonant load conditions,the pulse density modulation control may make the load current be discontinuous at light load.And the constant frequency asymmetrical voltage-cancellation doesn't have the wide power range operation.This paper presents a combined pulse density modulation and asymmetrical voltage cancella-tion control for series resonant inverter.The inverter has wider output power range operation.It achieves more steady out-put current,continuous power regulation,and operating in continuous current mode.This paper described the circuit struc-ture of the inverter,analyzed the working principle and control strategy of the inverter in detail.It verified the correctness of the theoretical analysis by the Pspice simulation.%针对串联谐振逆变器脉冲密度功率调节PDM(Pulse Density Modulation)轻载时电流容易出现断续，而恒频不对称电压消除法功率调节 AVC (Asymmetrical Voltage Cancellation)输出功率调节范围有限的缺点，提出了一种PDM&AVC的复合功率控制串联谐振逆变器。该逆变器的输出功率调节范围更宽，而且具有输出电流平稳、电流连续、功率调节连续等优点。文章介绍了该逆变器的电路结构，详细分析了该逆变器的工作原理和控制策略，并用 Pspice 仿真验证了其理论分析的正确性。