请问怎么才能通过负触发电路连接SMPS来控制TRIAC？

你好
我想直接从MCU（STM32F0）控制ST的无缓冲三端双向可控硅开关（T435-800）。根据AN3168（第2.4条），我要将AC主（220V，50Hz）电源与控制电路的Vdd连接起来。在AN392中，我发现用负电源说明三端双向可控硅开关控制，但使用电容式滴管。实际上，在连接AC主电源和+ 5V DC之后，我不明白发生了什么。所有我想和AN392一样，但想要使用SMPS（STEVAL-ISA010V1，基于Viper16）。或者我还需要其他东西，比如二极管剪刀吗？
感谢您。

#triac #smps



以下为原文




Hello
I want to control ST's snubberless triac (T435-800) directly from MCU (STM32F0). According to AN3168 (article 2.4), I've to connect AC main (220V, 50Hz) supply with the control circuit's Vdd. In AN392, I found the same that illustrate triac control with negative power supply, but uses capacitive dropper. Actually, I didn't understand what's going on there after connecting AC main with +5V DC.? All I want to do the same as AN392, but wants to use SMPS (STEVAL-ISA010V1, based on Viper16).  or Do I need anything else such as diode clipper?
Thanking you.

#triac #smps