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动态跟踪完全谐振可以解决线圈电感量不准或变化带来的问题.原理是串联谐振在完全谐振状态下最大功率取决于谐振电容的容量(负载极轻和加热到居里点除外,另外讨论).用单片机i/o口输出igbt驱动信号,内部比较器作为电流信号检测.软件相位判断并逐周期调整.电流和驱动相位关系见图.
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电流互感器有一定的相移,通过软件可以校正.
试验结果,用半桥10kw正常工作中通过带电增减谐振电容都能很好的跟踪.由于示波器没有脉冲时间触发功能没能捕捉到跟踪过程.肉眼根本看不出捕捉过程.对于现场制作线圈的场合汇方便很多.
