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次级绕组(aecondary windings)指变压器中不直接跟交流电源连接的绕组。但通过电磁感应将在此绕组上感应出电压，从而为直流电源提供所需的交流电压，电源
Secondary windings (aecondary windings) refers to the transformer is not directly connected to the AC power supply windings. But through the induction of electromagnetic induction in this winding voltage, so as to provide the necessary AC DC power supply voltage, power supply