第三章详细介绍了软起动控制器的硬件设计，包括主电路、控制电路、驱动保护回路和辅助开关电源电路的分析和设计。
The third chapter mainly introduces the hardware design of soft starter, including the main circuit, control circuit, drive circuit, and protect circuit and auxiliary switched power design.
机构中的辅助开关与机构主输出轴相连，在分合闸位置时发出相应的分合信号。
The auxiliary switches in mechanism connect with main output axle and give the relative signals in the open and close positions.
主电路采用具有无源辅助谐振网络的双管正激变换器，与普通双管正激变换器相比，功率管开关状态得到较好的改善，同时并没有增加电路的复杂性。
This paper introduces the circuit topology of portable inverter arc welder with soft snubber, mainly power circuit is a double switch forward converter with assistant resonant circuit.
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