self-inductance of coils 利用线圈自感
Switching Power Supply Transformer; Filters; Inductance coils;
开关电源变压器；滤波器；电感线圈；
Most of iron-core inductance coils are used in electrical circuit, such as transformer, relay, etc.
电气线路中多采用带铁芯的电感线圈如变压器、继电器等。
To design these elements in intrinsically-saf circuit is more practical than to design air-core inductance coils.
因此，在本安电路中设计这些元件比设计空芯电感更有实际意义。
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