Electronics > Projects, Designs, and Technical Stuff

Building a bench power supply

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c4757p:
"MCU" is microcontroller (unit). It's just digital control.

Paul Price:
MCU
(1) (MicroController Unit) A computer on a single chip. A device that often has integrated peripherals for many needed and useful functions, such as A2D, communication,  as well as programmed fixed and volatile memory RAM and always  the capacity to do general purpose computing according to a stored program.  As such, it can monitor, communicate and control other devices  through it many ports offering input and output to/from the core processor. It can also emulate many complex tasks usually performed by discrete circuitry or even replace or provide the functionality of other complex function integrated circuits. Among a myriad of useful things, it can control display devices and interface with the user through controls such as potentiometers and switches, all the while emulating the control usually offered by a discrete physical hardware approach to, even to enhance some non-digital analog applications such as in a power supply controller circuitry.

In other words it can be a power supply management, display and controller chip, all by itself, controlling a few external power active components with an advantaged minimum of added integrated interface circuitry.

stev.dk:
Arhh okay, i was confused (haven't sleept for to long i think), cause i did a google search on MCU control, and got some stuff about Multipoint Control Unit's, and i didn't see the potential for that here, lol.

I have an atmel atmega32, that i used for another project that died. I still have the firmware for the LCD display though. Im a tiger at programming these things, cause i am originally a programmer.

Your saying i could hook up a pot to the adc, following the position of the pot, and displaying it on the display, and somehow control the LM2576 with the microcontroller? Or, actually im pretty sure, thats possible (maybe not with that exact ic and micro controller), but im not sure how. My guess is using the dac and/or some pwm?

Paul Price:
Yes, using the A2D to monitor voltage and current and even control the switching transistor of a PWM power supply and all this according to user set values (voltage, max current from pots)  fed into A2D inputs, while outputs drive 7-seg displays, etc.

MARSHALBSB:
Funny thing! I'm trying to fix a DC Power Supply that's exactly like that one. Including the relĂ© comment  :-DD

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