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IRFPN Datasheet PDF – Power MOSFET
This page provides an outline of the project and links to the various blog posts that I wrote as I was developing the power supply. Source Code and Schematics Igfp044n the source code and schematics are on Github and may be used for any purpose.
I tried using 4 wire outputs but had stability issues. The LTC part has spectacularly low offset voltage and precision but is relatively slow. The GUI is simple but quite nice and I think could be made very nice with a bit of work.
The Raspberry Pi controls the mains supply to the transformers using some solid state relays.
IRFP044N MOSFET. Datasheet pdf. Equivalent
It’s pretty reliable and powerful Very precise Low noise Relatively quick to respond ratasheet load transients. As a result the Raspberry Pi has its own switching supply that powers it and the touch screen.
These proved to be pretty robust, had good thermal transfer and low enough gate charge to drive datsheet for my purposes. I reduced this a lot but I didn’t want to compromise the speed.
IRFPN – Infineon Technologies
Ability to individually turn each channel on or off. The project intro blog talks more about what I was originally thinking. I was irfp0444n using Welwyn wire power resistors but had lots of problems with the readings wandering as the resistor heated up. I’ve another irfp404non the voltage and cjrrent control schematics P1 the 4 pin connector at the end, as far as i can understand that is the output’ but i cant uderstand what the voltage control op amp datashedt measuring because its input are tied to earth.
This doesn’t provide much over the pre-regulator but does allow higher current output at lower voltages 4. Initially I used a voltage doubler circuit but this messed with the voltage waveforms under low-power enough that my pre-regulator wouldn’t work. Rather than one big board it makes sense for each supply channel to be separate. The GUI is really slow.
Thanks again for those well made projects. In March I started designing a precision, low noise lab power supply.
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Sure I could buy one but where is the fun in that! In addition to the voltage control loop the circuit has differential voltage measurement from the output terminals to minimise the voltage differences due to internal resistances of tracks etc. Maybe a web interface or for it to be LXI compatible or both.
A 5 to 12V switching converter provides power for a small fan and the raspberry PI uses PWM to control the speed of the fan in response to the temperature of the system. I eventually figured out this was a thermo-electric affect. I found an alternative circuit on the EEVBlog forum that was reproduced by a member called BlackDog from a design that came from elsewhere. It’s not the GUI itself but the fact that the system is polling three channels over relatively slow serial links.
So i was wondering if the schematics made with kicad were available to download. The problem with this circuit is it generates considerable noise as it switches at the point where the current is maximal. Yeha i’ve just googled it and i’ve found it on github it’s strange that this psu isn’t mentioned in forums because it could be the rival to an “industrial ” power supply.
What could have been done better:. There is a small overshoot when the voltage is set or when it comes out of current limit. Python code polls the state of each channel and updates the GUI.
Each channels communicates with the control interface via isolated USB each channel has an on-board micro-controller and isolated USB interface.
Doesn’t have to be quick. It’s small enough not to be a concert mVs The banana sockets have enough resistance that the measurement of the voltage at the back of the terminals creates eatasheet few mV of error at the front of the terminals. This is fine for current limiting however.
In addition the circuit switches transformer taps for different voltage ranges. What I don’t like.
Tom Biskupic 26 March at The Raspberry Pi cannot be powered off but must be allowed to shutdown gracefully. The problem is I need a gate voltage well above the output to make this work. This means a decent graphical display is required To have an Ethernet interface.
More on the pre-regulator below. This makes the time between making a change and the change occurring relatively long. As this is a linear supply managing waste heat is a big factor. See here for the first attempt. In the end I decided to manually wind an additional winding onto the transformers and run this is series with the output winding. There is lots more that could be done here.