By getting the direction function from the output AC current, the applied time of voltage vectors in one PWM period was chosen, the direction of central current was controlled for DC voltage balance.
该方法通过实时检测三相交流输出电流方向得到方向函数，利用该函数选择一个PWM周期内不同电压矢量作用时间来控制中点电流的方向，实现电压平衡。
A novel method of a capacitor in parallel with inverter is presented, in which current in levitation force winding can be controlled by PWM technique.
提出一种采用逆变器并联电容器的新方法，该方法通过PWM逆变器控制悬浮力绕组中励磁电流。
Acquired current signal were inverse feed backed with PWM, then, output of the chip SG3525 were controlled through PI regulator. As a result, the external characteristic was controlled.
采用脉宽调制型控制方法，对采集到的电流信号进行负反馈，通过PI调节控制脉宽调制专用芯片sg3525的输出，以达到控制焊机外特性的目的。
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