Maxim Efficient PSU

264

03:57:33

- Power Draw - 0.72W 
- Output Power - 0.6W
- Efficiency - 83% 

This should do the trick. The sampling frequency us somewhat high, but it's well into modern semiconductors range, so whatever components you choose they'll easily handle the frequency. Use whatever transistor you can get your hands on. Absolutely every semiconductor will work in this range. Try for instance a BC550, for the op amp, this is a little obsolete but a ua741 should do the trick. 

published 10 years ago

maxim251

10 years ago

Wow,that's very nice, but your circuit is not adjustable, I mean I can't regulate duty of work depending what kind and how much diodes I connect, and also Your frequency is changing. My goal is to keep frequency in that same level,and changing duty of on and of, I can change woltage depending at different configuration of leds.I want project cirkuit once and use it for many purposes.

maxim251

10 years ago

Sorry,I mean "I want change voltage depending at configuration of leds.or this same circuit use for power electric engine, like screwdriver or fan. Of course I will add high power transistors to power what I want. And circuit will be adjustable and stable.

maxim251

10 years ago

Thanks for showing me this type circuit. Is very interesting way how it's works. Greetings.

hurz

10 years ago

The instable behaviour in frequency is caused of a missing hysteresis which this kind of circuits must have by design. If not, they might get crazy in frequency.

thebugger

10 years ago

I added a hysteresis loop a few hours ago. The modifications must take time to show up or something, anyway the frequency will also change, as well as the duty cycle, especially in such designa. They don't have a frequency reference. And you can adjust the voltage if you want. Just add a potentiometer at the inverting terminal of the op amp and adjust the voltage

hurz

10 years ago

I have never seen an update delay.

thebugger

10 years ago

I've noticed a few very large delays, up to a day or so, and in the comments too.

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