充电宝的市场一直都处于不错的趋势，因为智能设备层出不穷，而且基本统一Type-C接口，一个PD充电宝，能给大部分设备供电。接下来看看，单Type-C接口如何实现可充电可放电在PD协议里，设备是可以通过CC通讯识别的，当接入的是手机，CC识别为sink插入，那就放电给手机充电;当接入的是适配器，CC识别为source插入，那就接收适配器的供电。
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