基于DSP的三相高频逆变器  

Three-phase high-frequency inverter based on DSP

作　　者：李维[1] 陈辉明[1] 

机构地区：[1]浙江大学电气工程学院,浙江杭州310027

出　　处：《机电工程》2014年第3期397-399,共3页Journal of Mechanical & Electrical Engineering

摘　　要：针对三相串联谐振负载由于参数的差异而导致谐振频率出现差异甚至相差比较大时,系统难以有效地跟踪谐振频率,电源可靠性降低等问题,提出了一种三相高频逆变器简单可靠的解决方案。采用数字信号处理器(DSP)TMS320F28035作为核心控制芯片,采用双环结构控制方式,利用电流外环实现了输出电流的有效调节,利用数字锁相环(DPLL)对逆变器输出频率进行了实时控制,实现了逆变器工作频率对负载谐振频率的有效跟踪。为了克服系统进入容性工作状态的问题,增加了限相环节,使逆变器工作在感性状态,从而实现了IGBT的零电流开通以及二极管自然换流,降低了开关损耗,提高了电源的可靠性。理论分析与实验结果表明,该方案实现简单、控制稳定、工作可靠,为相关的系统研究打下了良好的基础。Aiming at the problem that it is difficult to track the load resonance frequency and system reliability is reduced due to the large difference between three-phase load because of parameter difference,a three-phase high-frequency inverter solution was proposed.The digital signal processor （DSP） TMS320F28035 was applied as the core control chip and the control strategy used the double-loop mode,including the current-loop which could effectively regulate the output current and the phase-loop which could adjust the output frequency of the inverter to achieve the effective load resonant frequency tracking.In order to overcome the problem of the system working into the capacitive state,a phase-limit loop was added,making the inverter work in inductive state,achieving the IGBT zero current switching and diode naturally current exchange to reduce switching losses,and also improving the reliability of power supply.The experimental results indicate that the scheme is simple and stable,which laying a good foundation of the related system research.

关 键 词：高频逆变 数字信号处理器 串联谐振 数字控制 三相逆变器 

分 类 号：TM464[电气工程—电器]