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【单选题】
下列关于缓冲电路描述正确的是()
A.
缓冲电路主要是保护外因引起的过电压，比如雷击、分合闸等开关操作引起的过电压。
B.
缓冲电路的作用是抑制电力电子器件内因产生的过电压和du/dt，或者过电流和di/dt，减少器件的开关损耗。
C.
开通缓冲电路通常采用RC电路，吸收器件的过电压和换相过电压，抑制du/dt，减小开通损耗。
D.
缓冲通常采用RL电路，抑制器件的过电流和di/dt，减小器件的损耗。
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