过流保护
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当电流超过电缆或设备的安全限制时关闭电源传输的安全机制。
过流保护（OCP）防止过热和火灾危险。USB PD充电器包含OCP电路，e-marker芯片传达电缆的最大电流额定值。便宜的电缆如果没有适当的OCP，在高负载下可能过热，特别是绕过CC引脚电阻的不合规电缆。