69 Threads found on edaboard.com: Power Supply Triac
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 (...)
Hobby Circuits and Small Projects Problems :: 10.12.2007 14:15 :: Split841 :: Replies: 2 :: Views: 2471
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
Microcontrollers :: 14.08.2008 13:44 :: manish12 :: Replies: 7 :: Views: 877
Hi guys.. I need help from u all profesional designer..
do u have any design of a power supply..
the voltage from 240 Vac to transformer 18 V Ac.
i want to change the voltage using lm7815 and lm7915. it for +15 V and -15V.
can u give me a design circuit for this circuit.. any simplest design..
Analog Circuit Design :: 22.05.2009 01:15 :: akamilrazak :: Replies: 10 :: Views: 3638
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 (...)
Power Electronics :: 18.05.2011 10:07 :: aalbaschar :: Replies: 6 :: Views: 638
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
Analog Circuit Design :: 30.10.2012 04:54 :: Astrid :: Replies: 2 :: Views: 274
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.
Electronic Elementary Questions :: 27.05.2013 08:58 :: SunnySkyguy :: Replies: 13 :: Views: 724
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 (...)
Hobby Circuits and Small Projects Problems :: 22.10.2004 16:27 :: aNdreiBuuu :: Replies: 6 :: Views: 1659
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?
Robotics and Automatics Forum :: 13.11.2004 02:59 :: nicleo :: Replies: 7 :: Views: 6323
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.
Analog Circuit Design :: 16.04.2005 02:57 :: pico :: Replies: 6 :: Views: 2812
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:
Analog Circuit Design :: 02.01.2006 20:05 :: IanP :: Replies: 2 :: Views: 3723
Service Manuals, Requests, Repair Tips :: 06.03.2006 10:08 :: lexleo :: Replies: 3 :: Views: 2848
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
Electronic Elementary Questions :: 20.09.2006 10:34 :: dfullmer :: Replies: 1 :: Views: 2224
I have some questions:
1- what is the ac power line(or plug in home users) frequency response?
the power is : 220 V-50 Hz
2- how we can measure the signal and all harmonics, till to existence frequency in spectrum.?
3-If I want to extract one of the line harmonics (like 100 Hz) which device or filter could be used??
4- can yo
Electronic Elementary Questions :: 14.02.2008 08:28 :: manasiri :: Replies: 2 :: Views: 840
You can drive the triac directly from a port of any 8051. The chasis will be live as you'll have to connect the gound of the power supply to the neutral and the phase will be switched by the triac. Unless the triac develops a "short" for some reason, from the gate to MT1 or MT2, no risks are seen by me in (...)
Microcontrollers :: 28.06.2008 10:46 :: pranam77 :: Replies: 7 :: Views: 6994
Yes. And you have to double the power supply filter capacitor. But cause the purpose is to control an AC load from the same supply, I guess, transformer current capacity respectively effiency isn't a limiting factor in this application.
Analog Circuit Design :: 04.09.2008 04:03 :: FvM :: Replies: 9 :: Views: 1720
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 (...)
Analog Circuit Design :: 11.08.2009 20:43 :: hero0765 :: Replies: 0 :: Views: 882
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
Power Electronics :: 16.12.2009 05:19 :: Allan1942 :: Replies: 2 :: Views: 993
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 (...)
Analog Circuit Design :: 18.11.2010 02:36 :: UroBoros :: Replies: 10 :: Views: 2365
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
Microcontrollers :: 19.11.2010 15:07 :: FvM :: Replies: 9 :: Views: 2092
Please check the above triac circuit for the correct connection of triac terminals and power supply. It's supposed to give a nice cloud of smoke when powered.
To make it work correctly, MT1 has to be connected to neutral and the positive DC supply.
P.S.:And the microcontroller is dc (...)
Microcontrollers :: 07.01.2011 05:06 :: FvM :: Replies: 33 :: Views: 6918
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: (...)
Electronic Elementary Questions :: 25.02.2011 15:03 :: AleXYZ :: Replies: 1 :: Views: 562
The reason for failure is the high dV/dt of the "modified sine wave". It will cause self triggering of the MOC3023, and possibly even the triac. Placing a capacitor in parallel to the triac isn't the recommended means, you should rather follow the suggestions in the MOC302x datasheet, see
Power Electronics :: 05.03.2011 15:59 :: FvM :: Replies: 23 :: Views: 5274
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
Electronic Elementary Questions :: 19.05.2011 05:57 :: gonadgranny :: Replies: 6 :: Views: 1883
Actually that's my mistake in the writing. I want to control the heater temperature and for that coil need 1A of current not 1ma of for controlling 1 A of the current i want some design can you give me?I saw above design. Is it worked for the 1A of the above design where we connect the 230V ac power supply and and where
Electronic Elementary Questions :: 25.07.2011 01:32 :: nileshthakare2 :: Replies: 4 :: Views: 570
Better to start implementing some schematics presented in circuits datasheet , there we find also some explanations about how to choose components values and suggestions to follow in order to obtain the best results. On the input need to use a series resistor to limit the LED current. The value for the resistor is calculated considering volt
Electronic Elementary Questions :: 06.08.2011 17:29 :: mister_rf :: Replies: 4 :: Views: 1279
It is a simple device that was designed to regulate the power of the soldering iron powered by 230V.
Show DIY :: 09.01.2012 14:50 :: Vermes :: Replies: 0 :: Views: 775
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 (...)
Power Electronics :: 26.10.2012 05:57 :: Tahmid :: Replies: 10 :: Views: 1545
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 (...)
Microcontrollers :: 05.05.2013 09:52 :: doraemon :: Replies: 3 :: Views: 147
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 (...)
Professional Hardware and Electronics Design :: 09.04.2002 19:18 :: zorro :: Replies: 5 :: Views: 1092
Is there high voltage at the poti or is it somehow electrically isolated from the power line (I guess not :( ) ??? Is there a transformer or other power-supply between line and strobo ?
Hobby Circuits and Small Projects Problems :: 16.02.2003 15:48 :: M!k :: Replies: 6 :: Views: 1653
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 (...)
Microcontrollers :: 01.09.2004 12:09 :: Lwin Nandar Shwe :: Replies: 11 :: Views: 9434
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
Microcontrollers :: 30.08.2005 09:10 :: Fragrance :: Replies: 28 :: Views: 15667
Here is a concept of adjustable linear power supply based on descrite components and 723 voltage regulator:
For 30V output you will need to ensure that the unregulated voltage is >35Vdc and, of course, change th values of resistors around the potentiometer ..
Pre-regulation can be added to the above
Analog Circuit Design :: 11.06.2006 21:24 :: IanP :: Replies: 4 :: Views: 2613
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. (...)
Electronic Elementary Questions :: 02.11.2006 01:36 :: pankaj waghmare :: Replies: 0 :: Views: 545
My problem with the circuit is, that it's purpose isn't obvious. So it's difficult to guess, if it's operating according to the designers intention at all. If you know about the application circumstances, you should kindly tell.
A special aspect that can't be seen from the schematic without knowing part data is the relay operation. Is it
Analog Circuit Design :: 04.06.2008 14:06 :: FvM :: Replies: 9 :: Views: 1223
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 (...)
Professional Hardware and Electronics Design :: 01.11.2008 03:58 :: FvM :: Replies: 10 :: Views: 1876
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 (...)
Hobby Circuits and Small Projects Problems :: 16.11.2009 00:26 :: asdfghjkl1 :: Replies: 3 :: Views: 2602
It looks like employing an optocoupler will be a very good idea ..
Yes: with the triac connection as shown, an optocoupler is indispensable.
It would however be possible to avoid the optocoupler, if the DC power supply and the triac connection would be changed so that one reference node of the AC supply, (...)
Analog Circuit Design :: 09.02.2010 12:03 :: erikl :: Replies: 3 :: Views: 741
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 (...)
Power Electronics :: 14.05.2010 01:00 :: yamanoorsai :: Replies: 3 :: Views: 3106
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 (...)
Power Electronics :: 08.07.2010 04:13 :: Landsbytosse :: Replies: 6 :: Views: 1298
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
Electronic Elementary Questions :: 27.07.2012 03:35 :: siongboon :: Replies: 4 :: Views: 761
The temperature of the triac will be the same no matter what it's rating is. The maximum it can carry makes no difference to the power dissipation in the package and it's the dissipation that you see as a temperature rise. I think you need to be looking at a bigger heat sink.
Also consider that the current in the MOC3041 LED is barely enough. From
Power Electronics :: 16.01.2011 15:54 :: betwixt :: Replies: 4 :: Views: 929
I am unsure what you are trying to achieve here.. are you looking for a constant DC input to the ucontroller? or are you looking to detect it is connected to the mains or not?
If you want a constant DC, I think a step-down transformer, a rectifier and a regulator (which essentially is a linear DC power supply) is a good idea, although it does us
Analog Circuit Design :: 22.03.2011 10:32 :: sagar_satish :: Replies: 7 :: Views: 1273
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
Power Electronics :: 29.04.2011 06:24 :: pumpkinman :: Replies: 2 :: Views: 594
This may help you to protect or stop your motor when over loaded
Sensor Overload (Overload Detector, Overload Protector) | Electronics Circuit
Electronic Elementary Questions :: 19.08.2011 06:23 :: murali_dece :: Replies: 4 :: Views: 628
I want to control 220v AC.
Controlling of AC is a vague function. You want to control AC for what ?
For a lamp, for a motor, for a power supply or what you will run on the controlled AC?
Microcontrollers :: 08.10.2011 02:08 :: Raza :: Replies: 17 :: Views: 1436
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
Show DIY :: 26.10.2011 15:35 :: Vermes :: Replies: 0 :: Views: 911
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 (...)
Power Electronics :: 30.10.2011 06:37 :: FvM :: Replies: 11 :: Views: 1456
i want to make a switch that when connect 220v ac ,it create a delay about 500ms and then connect 220v ac to a ac motor.
i want to the circuit be passive and has not a dc supply.(similar dimer).
start current is about 15 a and normal current is 5 a
i want know that is there a triac to it's characteristic
plz hlp me
Power Electronics :: 09.11.2011 14:28 :: javadamirpoor :: Replies: 1 :: Views: 262
you can use PC817 opto isolator to drive a BD140 transistor, and drive a relay with that BD140. dont forget to add 1N4148 across relay`s coil.
use different power supply trace to power your relay and mega8 micro. add a decoupling capacitor near the power supply pin of atmega8 controller. don`t leave unused (...)
Microcontrollers :: 17.12.2011 10:19 :: erio :: Replies: 6 :: Views: 239