12 Threads found on edaboard.com: Triac Protection
The zener at the right circle is using to switch on the triac on a specific voltage level, according to the voltage drop on the 1k resistor which is in series with the scr. Of course this is happens when the load is high and using the triac as a protection for the current through the scr.
The second zener, I am not sure for its purpose. (...)
Power Electronics :: 10-01-2016 04:11 :: AdamsN :: Replies: 3 :: Views: 263
Dear Friends I need to control 30 or 40 Hp Motor through SCR (triac's) Is it Possible ? If possible wich type of triac's I want to use I am getting till up 40 Amp supported Traic's only I need 100 Amp supported triac Please suggest me
Hobby Circuits and Small Projects Problems :: 04-25-2015 07:38 :: sribangaram :: Replies: 3 :: Views: 582
As you know, all switch mode mains LED light bulbs need protection from the overvoltages that may occur if they are accidentally connected to a triac dimmer.
Given that such circuits are usually dissipative dampers, would it be acceptable, as an alternative, to simply sense the DC bus voltage with a potential divider, and if it gets too great, th
Elementary Electronic Questions :: 12-06-2013 11:54 :: treez :: Replies: 5 :: Views: 473
I have a speed control circuit for a 230v ac motor. It has got BTA 16 triac for pahse control and it is driven by an optocoupler moc3021 and the trigger signal is coming from a pic16f676 mc. Trigger signal is given according to an input event to the micro controller. The problem is Traic is getting switched on automatically sometimes when I turn on
Power Electronics :: 04-22-2013 02:26 :: raf23 :: Replies: 3 :: Views: 834
I have a lot of questions :-D
What are the things to keep in mind if I want to switch a computer smps (230Vrms, 50Hz and 3 amp) using an optobased triac? please suggest some links. also the triac should be able to take direct inputs from an mcu (i am using the atmega 8). is there any protection required in between the (...)
Hobby Circuits and Small Projects Problems :: 03-20-2012 13:13 :: bishshoy007 :: Replies: 2 :: Views: 1074
Is there any difference when using a SCR or triac in a 13,8Vcc crowbar circuit overvoltage protection? I mean triger voltage, action time, short circuit current capacity, RF imunity, size, power dissipation, etc...
Fernando - PU2PLL - BRAZIL
Power Electronics :: 12-04-2010 06:07 :: fjpompeo :: Replies: 0 :: Views: 2148
We finished talking about this circuit on the other website.
It has too many errors such as the diodes and triac connected wrong.
Hobby Circuits and Small Projects Problems :: 04-06-2010 00:34 :: Audioguru :: Replies: 2 :: Views: 2202
Because an SCR is not a symmetric device (NPNP != PNPN).
A triac is a bidirectional SCR pair that can / must be triggered
in the appropriate direction.
Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 01-25-2010 15:38 :: dick_freebird :: Replies: 4 :: Views: 2226
RC snubber is for filtering voltage spikes, it won't do anything to limit in rush current.
What you need is a suitably sized choke in series of your triac
For example a toroid wound with wire.
Analog Circuit Design :: 11-21-2009 23:07 :: xaccto :: Replies: 3 :: Views: 2562
As shown in the attachment in the link, a motor control circuit in which a surge current protection circuit is included.
Basically, the motor speed is controlled by changing the value of the variable resistor "R4", different value of R4 will trigger the diac and triac at different volt
Elementary Electronic Questions :: 05-30-2008 05:04 :: eepty :: Replies: 2 :: Views: 1068
As shown in the attachment, a motor control circuit in which a surge current protection circuit is included.
Basically, the motor speed is controlled by changing the value of the variable resistor "R4", different value of R4 will trigger the diac and triac at different voltage level. It is also called phase control.
However, I do not underst
Analog Circuit Design :: 05-30-2008 05:03 :: eepty :: Replies: 9 :: Views: 1839
Sense a zero cross @ rated frequency
as long as you have a active cross enable a triac to feed AC.
Professional Hardware and Electronics Design :: 01-10-2003 13:36 :: GrimReaper :: Replies: 2 :: Views: 1725