变频调速系统——短路换相式电流型逆变电路

Frequency-converting timing system of short phase-shifting circuit of current mode

针对应用较为广泛的串联二极管式电流型逆变电路变频调速系统存在的缺点 ,提出了一种新型的短路换相式电流型逆变电路。对该短路换相式电流型逆变电路的换相过程分析表明 ,该电路系统具有不存在叠加尖峰电压、电容器的充电电压与负载大小无关以及负载电流对换相过程影响小等优点。同时该换相分析过程也表明该新型短路换相式电流型逆变电路适用于泵类。

A new kind of frequency-converting timing system of short phase-shifting current mode circuit was introduced in view of the defects of inverse circuit of series-wound diode current mode,which is widely adopted in frequency-converting timing systems.Based on the analysis of the phase shifting process of the short phase-shifting circuit,it has many advantages,i.g.,in the circuit the system has no superposed peak voltage,the capacitor’s charged voltage is independent of the load and the load’s current has little influence on the phase-shifting process.The analysis also shows that the new system is suitable for a pump,a fan and so on.