【应用】双向可控硅KD20SF60 5600在单火线智能开中应用，开态电流可达20A

时间： 2022-02-19 来源：世强

技术问答

单火线智能开关项目，就是在灯具开关布线的时候，只引进一根火线，通过控制这根火线就能实现灯的开关，这与传统的零火线开关不同，单火线是两端都是火线，开关与灯是串联状态。

在蓝牙控制继电器闭合时，灯具为打开状态，此时为闭态取电，此时因为开关已关闭，开态取电电路在此处无法发挥作用，而在蓝牙模块在任何时候都需要供电，所以需要设计闭态取电电路，设计思路与原理图如下图所示。

当控制信号为开时，光耦导通，若火线输入为交流电正半轴，稳压管Z2负极电压升高，到7V左右双向可控硅导通，负载灯点亮。同时电容C1进行充电给MCU供电。

在本设计中双向可控硅使用的是新电元（SHINDENGEN）的KD20SF60 5600，其VDRM为600V，开态电流可达20A，有稳定的冲击电流能力。

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Shindengen（新电元）二极管/MOSFET/功率IC/功率模块选型指南

描述- In addition to offering diverse diodes as a leading company of diodes, Shindengen offers a broad range of MOSFETs from low-withstand voltage to high-withstand voltage, as well as high-withstand power ICs and power modules that centralize power circuit components.

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