全桥串联谐振电磁感应加热试验

全桥串联谐振电磁感应加热试验的波形.
igbt没有吸收电路.
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驱动频率等于谐振频率占空比最大时的驱动和电流波形
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驱动频率等于谐振频率占空比最大时的驱动和igbt电压波形
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驱动频率等于谐振频率占空比减小时的驱动和电流波形
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驱动频率等于谐振频率占空比减小时的驱动和igbt电压波形
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最大占空比频率升高时(高于谐振频率)的驱动和电流波形
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最大占空比频率升高时的驱动和igbt电压波形
驱动频率等于谐振频率占空比最大时的零电流开关最好,关断还是零电压.随占空比减小关断电流加大,关断也不是零电压了.
随频率升高关断也不再是零电流.
可见igbt开关损耗在驱动频率等于谐振频率占空比最大时.
试验中电流互感器制作有困难,试验了几种磁芯选了一个效果较好点的
波形还是有些崎变.二次圈数少崎变大.圈数多电压高.试验中用的滤波电容为10uf.电源220v.当满电压时,功率达到9kw.电流互感器二次电压很高,负载电阻(4.7k)很快烧毁了.
试验在继续中......