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随着人们对城市环境的日益关切，电动汽车的发展得到了一个难得的机遇。在城市交通中，电动大客车由于载量大，综合效益高，成为优先发展的对象。电动大客车大都采用三相交流电机，由于电机功率大，三相逆变器中的器件需要承受高电压和大电流应力的作用，较高的dv/dt又使电磁辐射严重，并且需要良好的散热。

You'll be able to visualize this type of electric power such as the tide of The ocean, it constantly flows in and out amongst the maximums of higher tide and small tide.

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可能会有童鞋有疑问，既然没影响，我们费劲巴拉加入个三次谐波干嘛？——对波形形状没影响，但是对最大能达到的幅值有影响啊，请看下图：

What we do is use the controller to promptly open and shut the switches multiple occasions per cycle within a pulsating pattern, Just about every pulse various in width. This is recognized as pulse width modulation. The cycle is damaged up into numerous smaller sized segments.

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根据前面的分析，每个桥臂单独调制谐波更少，因此，对于三相负载而言，多采用单极性调制，示意图如下：

建议：如果可以，多买一个 直流转换器，这个转换器专门给你那逆变器供电，然后如果直流转换器只能提供5A，那么逆变器输入就应当小于5A，否则可能会损坏那模块， 当然有一些直流转换器电流是很大的，如果修车的地方没有，可以到一些电器店或叫他们修理的给你进一个大电流的，或者多个直流转换器并联也可以，总之，不要让他过载就可以 。

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