We discussed the principle of 3d - svm and four legged circuit topology detailedly , attained the related control scheme . with the example of 15kva power system ' s inverter , the principle and derivation of 3d - svm , as well as the verification of simulation result was carried out . at last , we programmed on the digital congtrol platform and processed the light load experiment 本文详细介绍了3d - svm控制和四桥臂电路拓扑的工作原理并得到相应的控制方法，对该方法以15kva逆变器电源为应用实例进行了分析和仿真，并在dsp数字平台上编程实现，进行了轻载实验验证。
1 m 0 . 5 , the phase - shifted angle 6 is controlled in term of sine law which makes the magnitude of resonant voltage track a reference sine voltage , and the resonant voltage is rectified , filtered , inverted and then the better sine - voltage output is obtained , theoretical analysis and experimental results show that for the resistive load and inductive load , the switches of leading leg of the phase - shift - controlled circuit are always turned on at zvs , and ones of lagging leg are turned on at zvs ( < 0 ) or turned off at zcs ( ( > 0 ) , moreover , all switches in the low - frequency inverter are always turned on and off at zvs , the measured circuit efficiency for rated load reaches up to 88 % 从功率单向流动角度出发，提出了一种lcc谐振型恒频移相单相高频链逆变电路拓扑，在调制系数0 . 1 m 0 . 5情况下，控制移相角按正弦规律变化，使谐振电压脉冲列的幅值追踪参考正弦电压信号，经过整流、滤波、低频逆变，从而获得正弦度较好的输出电压。理论分析和实验结果证明对于阻性负载或阻感性负载，移相全桥具有超前桥臂零电压开通，滞后桥臂或者零电压开通( _ 0 )或者零电流关断( _ 0 )的软开关特性，而低频逆变器的各个开关均实现零电压条件下的开通与关断。
Zero - voltage turn - on and zero - voltage turn - off in lagging arm and leading arm of soft - switching topology , working waveform of power transformer and process of rectifier and transition are presented in detail . the influence of resonant inductance of the power transformer , resonant capacitor and variation of load to the process of soft - switching are given 主要对软开关滞后桥臂和超前桥臂的零电压开通、关断过程，功率变压器的工作波形及整流换流过程进行了详细的仿真分析，并重点讨论了逆变器的谐振电感、谐振电容以及负载变化对软开关过程的影响。
Slave cpu receives the spwm data and output the spwm wave by query the spwm table . the dead time is generated by hardware to prevent the h bridge arm from short directly . the power out module is protected for over current , over voltage and over heat 逆变器采用双cpu结构，使用spi进行连接，主cpu完成输入、输出和spwm波形数据的计算，从cpu接收到spwm数据后使用查表方法输出spwm波形，使用硬件电路生成死区时间防止桥臂直通，对输出功率模块进行了过流、短路、过压、过热保护。
