电磁炉原理图(03年大量上市)

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用图2电路做半桥做电磁炉,为降低发热和EMI,IGBT两端各并0.2UF电容,且要从500W-3500W调功,
在调功和换锅时同步时间及频都会改变,如何有过0点导通?搞不定了..