Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
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i made 220V AC to 12V DC 5A SMPS based on UC3842 using forward converter. schematic attached. supply's output voltage is ok and on no load (except indication led) pwm duty cycle is 1.1% with no mosfet heating (IRF740), but when loaded with even a little load of < 500mA, mosfet heats up although...
I have designed a 925v input to 24v output buck converter.
I am facing a voltage drop to 0v and then it comes to back to 24v how can I get the straight line that is 24v without dropping of voltage in the circuit please anybody help me .
hello, I have question about junction temperature.
I thermal simulated the chip (CPM2-1700-0045B, CREE) in LTspice.
However, I do not understand because it is very different from the chip (C3M0045065D, CREE) result.
The result of the chip (C3M0045065D) is that the heat gradually increases and...
My group is trying to simulate a UPS for a project and this is what we came up with. First picture is the multisim simulation, second the LT spice simulation, and third it is the output. For the LT Spice simulation - What could be wrong in my circuit for having no output in my graph? Or is there...
Hello everyone, I'm working on led driver design. Circuit sizes should be as small as possible. I will work at a switching frequency of about 2 MHz. My LED specs are 2.82-3.15 V forward voltage at 1050 mA current, maximum power 10 watts. my input voltage is not clear yet but I guess I will use a...
I have designed three phase inverter in ltspice with SPWM technique using mosfet switch. the output voltage at the load is incorrect. could anyone please tell me what is wrong in the simulation to get the output properly.
HOW TO COMPARE THIS SIGNAL USING RELATION OPERATOR OR USING COMPARATOR COMPARE THIS TWO SIGNALS TO GET OUTPUT OFF SPWM(SINE PULSE WIDTH MODULATION)
PLEASE HELP ME CREATE IT
In this circuit im trying to calculate the inductor value required to get a frequency cut off of 4khz, how do i go about this? I cant seem to get an equation as i cant use the basic passive equations since R2 is not in its 'normal place'.
Hi there,
So I am interested in the charging of NiMH batteries, some websites say that they should not be charged over 0.1C, some say 0.5C some say not over 1C.
I bought this wind up torch with a 80mah 3.6v batteries pack and noticed the current flow is around 200 mA, this is 2.5C.
So my...
Hello everyone,
I have a question about LTspice for power electronics.
how can I plot a parameter along the full simulation time, but it is averaged for each switching period?
That is to say, Can I see this averaged value changes along the time?
I know the .meas command can integrate between the...
Hi there,
I need a good understanding of the attached rectifier circuit.
Requesting all experts to explain how it works, its function and advantage and disadvantage as well.
Guide me for further development, how could we modify it.
This system contains 3phase, 380V, 50Hz ac input...
hello guys ,
Here is the situation, I am working on a 90 watts , 1050 mA , 72 V flyback based constant current smps which is used for outdoor LED lights,
Mosfet used 12A 800V
O/P diode used - Average forward current 8 A , Peak revers voltage 400V
In this design diode and Mosfet are getting...
Hi,
Some opto-couplers, like 4N25, have a terminal for the base of the output device, what are the advantages of having this terminal? Looking for an answer, I ran into this. I can somehow understand that the base connection can increase the speed but I don't understand how this terminal can be...
hello everyone,
I am working on a project and have to design a common gate amplifier by using MOSFET so I am a little bit confused in desgining can u help me the circuit designing of common gate.
I just want some parameters value like resistor at gate and drain and source plz help me
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