Author Topic: Bridge Rectifier as Load for a SSR Circuit  (Read 691 times)

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Offline XaviPachecoTopic starter

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Bridge Rectifier as Load for a SSR Circuit
« on: August 03, 2018, 04:37:35 am »
Somehow, I wanted to control the power to a bridge rectifier. I had two ideas in my mind:
1- Using a PCB mounted power relay driven by a transistor (is isolation maintained?)
2- Using a SSR, i.e, a power triac driven by a optotriac as shown below

In both cases, I would have to place a NTC thermistor to limit the inrush.
Now, the idea I chose was the SSR, no tested yet. But someone told me:

Zero crossing will work for the first 1/4 cycle, but then
a) There will be no current flow to the "zero-volt switch" IC for it to know when the zero-cross happens, because "2200uF" is charged to 170V & all bridge diodes are reverse biased.

b) Even if a firing pulse is given to triac @ zero-cross, it will not latch-on, because the available current is below "hold-on" current for Triac
 


I would like to hear your viewpoints.

 


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