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I found an alternative circuit on the EEVBlog forum that was reproduced by a member called BlackDog from a design that came from elsewhere. The Raspberry Pi cannot be powered off but must be allowed to shutdown gracefully. In addition the circuit switches transformer taps for different voltage ranges.

(PDF) IRFP044N Datasheet download

A Raspberry PI based control interface. In March I started designing a precision, low noise lab power supply. Tom Biskupic 26 March at The specs I ended up with were: Ability to individually turn each channel on or off. Doesn’t have to be quick.

Then the entire control system would have been floating above the positive output rail and I could have used lower voltage cheaper parts. 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. When the button is pressed again this just notifies the Raspberry Pi a shutdown was requested and the Pi initiates a shutdown before finally signalling its supply to turn it off.


As this is a linear supply managing waste heat is a big factor. I reduced this a lot but I didn’t want to compromise the speed. 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. Source Code and Schematics All the source code and schematics are on Github and may be used for any purpose.

If you decide to do something with my design consider buying me a beer! What I don’t like. I switched to precision vishay 4 terminal sense resistors which allowed me to reach the 1mA precision I wanted. Lab Power Supply Project. 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.

Thanks again for those well made projects. Managing the heat achieved by:. This means a decent graphical display is required To have an Ethernet interface. I’m also looking at your dummy loadsurely you know what you’re doing. Three isolated output channels.

The LTC part has spectacularly low offset voltage and precision but irfl044n relatively slow. The problem is I need a gate voltage well above the output to make this work. Of course I could buy one but given I an am using this supply to learn about electronics it seemed a perfect opportunity to build one!

Displayed current, measured output voltage and power output. The project intro blog talks more about what I was originally thinking.


IRFPN (IRF) PDF技术资料下载 IRFPN 供应信息 IC Datasheet 数据表 (2/8 页)

I found some cheap AD references on ebay that are more than adequate for setting the DAC reference. Bigger boards cost more and will take more debugging time.

Datasheeet the schematics and software are available on Github here https: Hi first of all i must say that this is a real irtp044n supply and probably one of the most complete on the internet.

Even show cumulative amount of energy consumed by the driven circuit.

IRFPN – Infineon Technologies

The GUI is really slow. The Raspberry Pi controls the mains supply to the transformers using some solid state relays. I tried using 4 wire outputs but had stability issues. So In general what I’d like is to have two or three output channels and the ability to run two in dual tracking mode. Kivy Pi renders all of the buttons, text and other GUI widgets and handles touch events.

Sure I could buy one but where is the fun in that!

There is a small overshoot when the voltage is set or itfp044n it comes out of current limit. Happy to help answer any questions. More than likely this would mean a custom transformer so instead I plan to use three off-the-shelf torroidal transformers.