请问三端双向可控硅短路保护怎么做 ？

你好Medhi，
三端双向可控硅是一种在未被栅极电流驱动时在零电流下自动关闭的器件。当电流流动时，无法关闭设备。
即使Triac技术与MOSFET技术相比还具有高电流鲁棒性，如果在三端双向可控硅开关导通时出现负载短路，保护三端双向可控硅开关的方法是在三端双向可控硅开关和负载上串联一个保险丝。
为了设计保险丝并确保三端双向可控硅在截止事件发生前能够安全地承受高电流，请使用低于三端双向可控硅开关的I²t参数的保险丝（参见您的三端双向可控硅开关数据表）。
希望能帮助到你，
 
最好的祝福
伯努瓦



以下为原文




Hello Medhi,
Triac is a device that is automatically turned off at the zero current when not drived by a gate current. No way to turn the device off when the current is flowing.
Even if the Triac technology allows high current robustness compare to MOSFET technology, if a short-circuit of the load appears when the Triac is ON, the way to protect the Triac is to add a fuse in series with the Triac and the load.
To design the fuse and to be sure that the Triac can withstand safely the high current before the cut-off event, take a fuse with a I²t parameter below the Triac specified I²t (see datasheet of your Triac).
Hope it helps,

Best Regards
Benoit

您好
renard.benoit
 这是真的，当三端双向可控硅开关打开并发生短路时，三端双向可控硅会被破坏。
现在我正在研究mosfet。它工作得非常好
谢谢你的重播。
 
 注意：原始帖子包含大量线程对话，只能迁移到第9级



以下为原文




HI
renard.benoit
this is ture  that when the triac is on and short circuit is occur so triac will be  destroy.
now i am working on mosfet. it is working very good
thank you for  replay.

Note: the original post contained a large number of threaded conversations and was only able to be migrated to the 9th level

你好Medhi
别客气。
Additionnal认为您的选择：
为了保护MOSFET免受负载短路，您需要一个特定的复杂电路，通过分流器（具有损耗）监控电流，以关闭其SOA中的MOSFET。
这就是为什么Triac通常更适合用于调光目的的原因。
与Triac相比，其他MOSFET的缺点是：高功率损耗，相同电流额定值器件的价格，或者非常差的雷电浪涌（需要巨大的MOV）......
我的建议是重新考虑你的选择。
此外，根据您的应用要求，为了安全起见，通常必须使用保险丝，然后没有额外的设备/电路来保护三端双向可控硅。
希望能帮助到你
伯努瓦



以下为原文




Hello Medhi
You're welcome.
Additionnal thinks regarding your choice:
To protect MOSFET against load short-circuit you need a specific complex circuit, monitoring the current with a shunt (with losses) to turn off the MOSFET in its SOA.
That's why the Triac is often preferred for dimmer purpose.
Others MOSFET drawbacks compare to Triac are: high power losses, price for a same current rating device, or very poor withstanding to lightning surge (Huge MOV is required)...
My advice is to reconsider your choice.
Moreover, according to your application requirement, a fuse is often mandatory for safety purpose, then no additionnal device/circuit to protect the Triac.
Hope it helps
Benoit

您好
renard.benoit
是。三端双向可控硅更适合调光器。但我不能在我的电路板上使用保险丝。所以当短路时
 
发生的三端双向可控硅会被破坏。现在我用这个schamatic。但是部件号不同。
线电压220伏有效值，311伏峰值。
 负载电流为3安培。
那么在阅读数据表和研究soa曲线时应该考虑哪个参数（rms或peak）？
谢谢
 
 
 
 注意：原始帖子包含大量线程对话，只能迁移到第9级



以下为原文




HI
renard.benoit
yes. triac is better for dimmer. but i can not use fuse in my board. so when short circuit will be

occur the triac will be destroy. now i use this schamatic. but with different part number.
line voltage in 220 volt rms with 311 volt peak.
load current is 3 amper.
so which parameter (rms or peak) should be to consider  when  read the datasheet and study soa  curve ?
thank you



Note: the original post contained a large number of threaded conversations and was only able to be migrated to the 9th level