Whatsminer P21 PSU EMI filter circuit
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The EMI circuit of Whatsminer P21 power supply is mainly composed of fuse, varistor, X capacitor, common mode inductor and Y capacitor. Its function is to filter the 220V AC input and filter out some interference of AC voltage. Under normal circumstances, this part of the circuit does not affect the performance parameters of the power supply. This video will explain the circuit routing of the circuit in detail.
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