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69 Threads found on edaboard.com: Triac Power Supply
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 (...)
how i can on the ATX power supply for my micro-controller board . in my universal rf remote controller board , after switch on the CFL1-4 , microcontroller restart . cfl drivers with opto triac , isolated relay , but still there is problem . board try with cd ,dvd player power supply , tran
no... if we want to design a power supply that can produce variable ac voltage, can we use regulator? i guess it was totally a different circuit.. maybe need to use thyristor.. i really need help on that.. designing a variable 0-30 AC voltage supply.. anything similar can also help.. basically it about to design a variable voltag
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 (...)
I design power supply for electric fence. Primari voltage 230V AC 1 Secondary +5V <100mA for control electronics 2 Secondary +400V for charging 70uF capacitor, capacitor must be recharged in less 1s Other conditions and pitfalls Control electronics must be able to source block for time <1ms, ie after the time when the capacitor discharges
If you can specify the resistance or impedance of your heat electrode, then you can determine what voltage you need to apply to dissipate 1.5kW. Most likely you can use triac control AC or cycle count burst control using a ZCS triac with suitable driver.
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 (...)
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?
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. Yea, coupling batteries via rectifie-bridgein serial to 2 KW heater... ---- don't try this depend of risk for electrical chock and destroy batter
If you intend to control an inductive load (motor) in burst mode with zero-crossing MOC then you can consider elimination or reduction of the snubber .. Here is an article on "NEW triacS: IS THE SNUBBER CIRCUIT NECESSARY?" which will help you in selection of a triac and snubber circuit while working with inductive loads: labcontrol.pqui.
I'm looking for ATX schematic with TL494, LM339, 34063 (I think for the +5V standby) there is a UC3842 on the hi-voltage side, 3 transistors, can identify K2645, C4161, can't read the other. its a very compact supply form factor haven't found what i'm looking for of the schematics on this board or googling yet... hmm, why the TL494 an
Hi. I'm trying to use an MOC3021 opto triac to switch On/Off a little power supply(the 230 V side). I want to use it for direct load switch, not using it as a driver to a second triac. In MOC's datasheet it is a "warning" such that: "This optoisolator should not be used to drive a load directly. It is intended to be a (...)
Home plug has very close to 0Ω impedance to frequencies much higher than 50Hz, if that is what you have asked. Harmonics can come through line itself from other users or from your equipment as well. As V_C explained, most common harmonics in households come from power supply rectifiers with poor power factor correction, where (...)
Hi to All can i drive a triac from controller port without a optocoupler and what is the risk of that and please advise me a good interface driver circuit please help me to understand the sunbber circuit what the function of it Regards
I make a 12Vac dimmer useing hotlek mcu to drive the triac the circuits are in the attached. . . . i get problem when i get fire to the triac then the 12Vac was distorted. And it casse me cannot detect the zero crossing ... anyone can help thx!! normal 12V ac when triac was not fired
hi: everybody! I am using a triac to control the input voltage of the power transformer to control the output power of the magnetron, using in the micorwave oven. But the transformer is easy into saturation state. In this case, the transformer behave like a short circuit and the input peak current becomes very high. It is (...)
My mains transformer burnt out. This is in a Hallicrafters HT37 transmitter so is fairly common. I sourced three transformers to do the job of the original and fitted them on the chassis. The new high voltage transformer has a 425v-0-425v 160mA winding and I fitted a full wave bridge which gives me 1100v off load. A full wave rectifier using the ce
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 (...)
In the 1st and 3rd quadrants apply a "0" to the triac gate to turn it on and in the 2nd and 4th quadrants apply a "1" to turn it on. It's not clear, which circuit you imagine, but I fear the suggestion is wrong. Most triacs can be triggered in all four quadrants, in other words, you can apply either a positive or a negative voltag
Is it controlling the Speed or just switch off/on? control the speed With a Relay?? not a good choice Obviously it should be the triac.
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: (...)
This problem has had me pulling my hair out for 2 weeks now... it is wired up on my bench and can't find the right incantation to make it work! How do I do TTL level switching of a high voltage A/C circuit with the modified sine wave as shown? Should I be using something other than a triac? Is the problem that the load is capacitive? [url=
Hi. Would it be possible to use this (or any other suggestions) triac to switch 40W bulbs connected to a 240V power supply using a 5v signal? (Arduino Microcontroller) I am unaware of ex
Hi I wanted to control the heating element through the triac who passes the 1ma of current .If any one knowns how we design the circuit Please told me. thanks in advance nilesh
Hello I am working on a few hobby electronic projects... My background is in software development, but I have taken a few electronics & hardware courses as part of my Computer Science degree. I am working on a circuit to switch a/c from a low voltage (dc) logic circuit. I have already built a parallel interface board with led indicators as well
It is a simple device that was designed to regulate the power of the soldering iron powered by 230V.
It seems like it ought to work. 1) Turn on the switch as the sine wave approaches zero. 2) Draw several amps to charge a smoothing capacitor. 3) Then during the rest of the cycle, the capacitor maintains volt level on the load. --------------------- However the current burst will consist of tens of amps, going through the SCR/tria
Hi guys, I have searched forums to no avail, so I figured maybe you could help. (I am an absolute novice) I have two wires which have DC current flowing through them. One has 5V DC at 500mA, and the other ranges from 10mV to 3.3V with a small varying current. The current has to flow in two directions for that second wire which is hooked up to so
Hi masterx81, if your power source is DC, what you say (variable duty cycle with 555) is OK (for AC you could use a phase control wuth triac). A power MOSFET (as IRF520 or 6N10 among others) will be better than a bipolar transistor. It has very low ON resistance and very fast switch, so no power consumption. The gate can (...)
I studied your schematic and modified the circuit a little bit. At you can find a proposal how to switch a high-voltage load. They use an opto-coupler (LED & triac) to separate high-voltage from the low-voltage part (see ). Using this coupler I changed you strobos circuit in that way
Could you help me? I tested user interface part that contain five push buttons , a LCD , and two crystals(7.68MHz and 32kHz).The 5V power supply is built with a transformer .The zero-cross and a triac inputs are not connected to the PIC.When the dc volt is applied to PIC , "Welcome Screen" is not seen although the push button is (...)
Hai I am doing a remote fan regulator using PIC16F628. How the PWM module in PIC can be used to controll the speed of a ceiling fan? Or else what method can be used to control the Speed . Using a commercial TV RC5 remote control I will send command to the unit mounted in the switch board. the unit ca
Hi, i looking for a linear PSU for 30V-10A with discret parts and a pre-regulator like triac for the primary transformer. Have you anything to propose for start? I think to use PIC16F8XX for drive it. Thanks to help me. regards.
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. (...)
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
mcu drive the above dimmer in 12Vac however the gate signal is greatly affect by the triac and it's lost in control . The gate and the MT1 signal are so low in impediance (abt 50-100 ohm) and the MT1 signal feedback on the triac gate termianl. . . how to solve
Hey, I am trying to put together an ac switch using a triac and a MOC3020. I've tried simulating it with the circuit given in the MOC302x datasheet, but the triac seems to latch and not want to "unlatch". (for sim purposes I used Q4015L5 triac...couldn't find IT415 lib) I can reduce the gate current so it doesnt' latch and it works (...)
Hi all. I need some help with circuit in the attached file. I need to momentary trigger a 240V relay through body capacitance. Relay must be on just until I keep my finger on the touch plate. I could design the circuit in file: from the upper part I get 12V and, with the Q9 transistor I can have 12V on C3 as long as I keep my finger on the touc
if constructed the circuit then conect a 100watt bulb in series with the regulator vary the pot . then also their is no dimming then their will be the fault on diac/triac
Hi there, I have a power supply with a filter, diode bridge and a large cap to hold the voltage close to DC. A NTC is mounted to minimise inrush but this is not enough due to its lose (Thinking Green :-) ) When powering up large inrush currents are seen. Is there a cheap and easy way to elimnate this problem. Using Relays acroos (...)
You can use a touch sensor circuit, The circuit uses very low voltage which is safe for use in the bath room. The capacitive sensor use QT100 IC and works under various material. This means that it is possible to waterproof the touch sensor for bathroom use The sensor can be interface d
Hello; I really need help friends :?: I am tring to drive a single phase motor 4A with BT137(8A), but triac gets hot like 35 celcius degree (even I am using cooler) and after some switching it is getting failed. So that later on I have changed the triac with BTA41(40A) and bigger cooler, but it is still hot around 30 degree, and in one week BTA41
You should just get an opto-isolator zero-cross chip they are much cheaper than a transformer. They usually output a pulse at zero-cross meant to drive a triac. This way you can keep a triac on without using firmware resources to maintain the triac on.
i am working on a project for an EL wire sequencer that will be controlled with a microcontroller. my initial design simply used triacs (511-Z0103MA on mouser) in series with the the EL wire and an AC source (120Vp at about 1kHz). the gate was connected to a resistor and then to the microcontroller output (actually, this was simply a DC power sup
It is possible but it will not solve your problem and also resistor just waste your power . In cars they use mechanical solution and when the window goes up the shaft will be released . In your case if you want solve it with electronic you should sense the current and when it reach to high level then you can send an order to cut the power with
You can use triac.It's very cheap and easy to use
powered butt is ZD-929 IRON. A transformer was from a video on a single secondary winding 25V/2A. From this transformer, two taps were taken of 23V to power the heater and about 8V to power the electronics +5V, the second winding
As already discussed, the assumption in the initial post, that a MOC30xx can't supply the gate current required by a 25 or 40 A triac isn't correct. It can supply 100 mArms and much higher peak currents. The problem is however about minimum series resistor and acceptable turn-on voltage. As long as no specification is given for the (...)
Dear javad Hi Your answer is very simple . why you don't try with thyristors or triacs or GTO s , if you don't want to use DC supply (you can find them in your characteristics and in cheaper price) or in simple step you can use this circuit as well as: 64039 when you give your pwm to g1 into its source, you should give i
How you are controlling motor. triac or SCR. Show us the schematic.