10 Threads found on edaboard.com: Triac Protection
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
Electronic Elementary Questions :: 12-06-2013 11:54 :: treez :: Replies: 5 :: Views: 285
check the snubber ckt. there is a snubber for triac and MOC3021 and combiled with gate protection. ref MOC3021 datasheet.
Microcontroller initialization should happern without any initial delay.
Microcontrller may get reset during mains ON/OFF. Due to EMI/EMC. u can chaeck that.
Trigger signal I/P event may get triggered during mains ON/OFF.
Power Electronics :: 04-22-2013 07:01 :: jpsganesh :: Replies: 3 :: Views: 602
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: 881
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: 1670
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: 1982
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 IC Design and Layout :: 01-25-2010 15:38 :: dick_freebird :: Replies: 4 :: Views: 1792
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: 2370
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
Electronic Elementary Questions :: 05-30-2008 05:04 :: eepty :: Replies: 2 :: Views: 886
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: 1531
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: 1396