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18 Threads found on edaboard.com: Triac Protection
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.
i use the attached circuit for controlling the speed of a universal motor instead of lamp . so as the motor is an inductive load i need some precaution please help me what components should i add to the triac part of my schematic to make it practical ? thanks
Sense a zero cross @ rated frequency as long as you have a active cross enable a triac to feed AC.
I always have many doubts on what would be better: triac or relay. These would be used for switching 230VAC devices such as flourescent bulbs (with "electronic transformer"), inductive loads and heaters. The first idea that comes to mind is to use relays as they can withstand surge voltages and currents better than triacs. When it comes to (...)
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
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
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.
We finished talking about this circuit on the other website. It has too many errors such as the diodes and triac connected wrong.
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
Hi, I am new to electronics but have but a power circuit for my pic and have programmed it. I am trying to control my home sprinklers and am having trouble with the triac part. I have tried to read the datasheets but don't really understand all the numbers. I have attached a circuit and would like some feedback. For breveity I have left out all the
How you are controlling motor. triac or SCR. Show us the schematic.
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 (...)
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.
You have several problems here. #1, voltage spikes, these are "cured " by putting Zenamic or such like across the line. These are voltage dependent resistors, that go low resistance for a voltage overload. Their problem is that they will soak up large surges, provide they don't last too long. They are normally rated for pulses of up to 50 microse
use H-bridge circuits with motors. buffers & latches like 74244 &74373 opto couplers driving transistor power electronics components like thyristors, opto triac, triac's also use diodes and zener diodes as protection to ur circuit
Hi all. Please take a look at this is a "current sensor" circuit. When the PC is getting current the circuit turns on any other device connected to the triac. What I don't understand is the reason of that 0.82Ω, 2W resistor in parallel with the two BY398 diodes. Is i
I don't see an actual issue. I've operated optoc triac circuits designed for 230V at 115V without any changes.
1. Use transformer to step down from 230rms to 5V rms and then u can send it to ADC after clamping the mean valuw of voltage to positive side. This will also provide isolation from line and use surge protection at transformer secondary to minimize hard to ADC and circuit. Transformer is best and mostly used solution. 2. Instead, u can go for triac,