在实际的测试中发现TL494输出的波形很正常，当将TL494的波形输出到IR2104后，IR2104的输出的正电压可以达到供电电压以上，估计是自举电容的作用，另外分析IR2104的VS端即MOS的S端是处于悬浮的，此电压最低为输出的负电压减去二极管导通压降，因此使用IR2104驱动存在较大问题。
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