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UCC28070A: 交流输入电流波形异常

Part Number: UCC28070A

黄色:电流互感器采样信号:
蓝色:输入交流信号;
红色:输入交流电压

请问为什么这个输入交流电流波形是这个形状啊,应该是平滑的?这一般是什么原因导致。UCC28070a