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11 Threads found on edaboard.com: Triac Protection
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
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
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.
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 (...)
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... 73, Fernando - PU2PLL - BRAZIL
We finished talking about this circuit on the other website. It has too many errors such as the diodes and triac connected wrong.
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.
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.
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
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
Sense a zero cross @ rated frequency as long as you have a active cross enable a triac to feed AC.


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