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25 Threads found on Power Supply Triac
Hi I am using a triac to drive am AC contactor. the contactor coil is 1.25H & 385ohm The problem is that the snubber circuit burns when I turn on the supply "220V" What should be the R & C values and rating for the snubber circuit to drive such load? Best Regards Hossam
I have a power supply do i turn it on
could you post the correct circuit? this one isn't isolated, as pin 2 from the 220-lamp connector (which goes to the triac) is connected to VSS and thus to the 5V power supply...
If you dont use an opto, you loose isolation between your micro circuit and the mains. Is that acceptable? What kind of power supply do you have driving the microcontroller circuit?
Heater control will use full wave switching (as required by power quality regulations), in so far no high switching frequency would be involved.
"Dimmable" LED power supplies are expected to work with regular triac dimmers. The LED brightness should be independent of AC input voltage, the power supply is sensing the dimmer phase angle. No idea how good it works, just try.
Hello All, I am trying to drive triac with Positive power supply. With positive power supply it should be possible to drive triac in Q1 and Q4. Here is the circuit I am using. But triac is not triggering. I have checked in oscilloscope the signal on gate looks (...)
Thanks for reply. Is there any software tool and tutorial available for the designing o pulse transformer quickly ? I have toroid from old switching power supplies (input common mode choke). I do not have datasheets for these toroid.
I design a board with 3 triac output. The power supply is 220VAC and i want to give 150VAC to a load. The load i a switching AC/DC load with power max cons. 40VA. I detect zero cross and i trigger the MOC for 1ms only. The problem is that after some times a triac is "burned". I am using the (...)
A three phase 440V 63 A contactor will need a inrush drive of 100W, with a holding power of 20W or so. You can drive this via a solid state relay which will contain a opto isolator and a triac and will require something like 5 V at 20 mA to operate it. The real problem is that the contactor coil will require a supply when the mains is (...)
If you want to design a low cost heat sealer, then you must use AC power without any conversion. Otherwise you end up with a welder or an expensive SMPS @ $1/W. To do this you must choose a much thinner heating element with perhaps many windings in series.
Hello! You need to tell us more. Especially, "the current has to flow in 2 directions". Usually, you have one power supply, (in this case with 5V output) and the current flows from this power supply to some kind of load. Do you need a switch between the power supply and the load, and this (...)
Yes you are correct its purely DC which supports PWM. you can refer the PDF below to control triac using control system using the MSP430. Alternate power supply circuits are included. A listing of triac control software available is presented
For isolation and safety, you should use a transformer-based power supply instead of building a non-isolated 220V to 12V converter, especially considering that the power requirement is 72W. Maybe you don't want to use transformer because of the large size of the 50Hz transformer. In that case, you should be using SMPS circuits. But, even (...)
Hi! I'm working on designing a touch button using pico power AVR microcontroller. upon detecting a touch, the system should activate an AC appliance. For that i will use a triac. The whole circuit should consume no more than 1 mA at 2V. Now I'm searching for the best way to power this circuit from the AC mains without using a bulky (...)
Subject says it all, really. I am a little out-of-my-league when it comes to triacs and SCRs. The power supply is a square wave and I cannot get the triac to turn off. I suspect it has to do with the fact there is no zero-crossing or that the load is capacitive but don't know how to fix it. Here's the circuit: (...)
I need to control a a load (heater) using a triac. I need to use something like pulse skipping modulation to control the heater. The Microcontroller board and Analogue part will be working from a +12-0 -12V transformer based power supply. I think I can use the DC before filter with a transistor arrangement to trap the zero crossing point for (...)
Dear All, I am trying to implement 0-230V variable voltage control to my high voltage power supply. I am using a ceiling fan regulator to do the same. But I am not able to control the voltage. When I keep the regulator in off position, I am able to keep the power supply to the module switched off. However, when I turn on (...)
if R3 is not added, the 2N3906 will break down for unknown reason . . . Look sharp and write obvious instead of unknown. Actually, you have two options: 1. Connect DC power supply GND with triac A1 terminal. Requires either an isolated supply or rearrangement of the AC load. 2. Use an optotriac for (...)
Anytime i want to build some power supply i have to have a there any solution to build some power supply without using a transformer?I was thinking about an pwm regulated power supply which uses triac(s) and the current coming right from the main source ( 230 V 50Hz).Does (...)
Hi I have to design a cicuit diagram. design a circuit diagram on change-over switches which is i can build it in the lab which is include in the circuit two switches, using current sensor(important), power supply, two load to test your switches, microprocessor to control switches( so u need a program), MCB and triac.....etc. (...)
Hi, The data sheet that I looked at said "peak repetative surge current of 1 amp" with the note of pulse width of 1 millisecond. So the rating is not quite what you think it is. However having said that the main limitation for the device and the application seems to be the devices power disipation limit of 330mw. Figure how much power you will
I think it's another idea for transformerless power supply. You can try it with resistive load before working with the Batt. And please let us know your experiment's result.
I assume the 'high power' of the DC motor is 'DC power supply'. If it's DC power supply, probably you could use MOSFET or IGBT to replace the triac. Can you have that option?
The power supply is very simple ( no transformer based) so all the circuit isn´t isolated, and for that reason i don't need an optotriac (reduces project costs). There is another problem... the gate current must be over 50mA... for opto diac the command curent is reduced to 5-10mA. Your power source is enough to (...)

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