13 Threads found on edaboard.com: Triac Protection
i am making a small project where i need to just ON and OFF 3000W heater using a triac and 89S52.
attaching a circuit diagram. Kindly request you to please check the circuit and components and let me know if any changes have to be made.
as i need to play with high current, so before putting it into use i need to reconfirm and check if
Microcontrollers :: 02-17-2017 00:07 :: gauravkothari23 :: Replies: 7 :: Views: 253
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: 355
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: 602
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: 492
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: 876
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: 1099
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: 2216
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: 2223
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: 2281
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: 2593
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: 1108
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: 1933
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: 1772