Author Topic: EEVblog #473 - Microcontroller Voltage Doubler  (Read 14829 times)

0 Members and 1 Guest are viewing this topic.

Offline smashedProton

  • Frequent Contributor
  • **
  • Posts: 644
  • Country: us
Re: EEVblog #473 - Microcontroller Voltage Doubler
« Reply #25 on: May 28, 2013, 01:08:52 am »
Well now that this thread is derailed, "real genius" is another great movie you all should like.

Invention, my dear friends, is 93% perspiration, 6% electricity, 4% evaporation, and 2% butterscotch ripple.

Offline jancumps

  • Supporter
  • ****
  • Posts: 1251
  • Country: be
  • New Low
Re: EEVblog #473 - Microcontroller Voltage Doubler
« Reply #26 on: July 04, 2013, 07:37:53 pm »
spotted one:


Offline NivagSwerdna

  • Super Contributor
  • ***
  • Posts: 2230
  • Country: gb
Re: EEVblog #473 - Microcontroller Voltage Doubler
« Reply #27 on: January 21, 2016, 01:54:29 pm »
I've just watched this video and think it has a technique that might be useful for a project... I have a clock that needs a 100mS pulse at 24v, the clock has a 10k resistance (although I guess it's really a solenoid so probably behaves a bit more like an inductor than a resistor)... Anyway if I can store enough energy to move the solenoid in a capacitor and then discharge it into the solenoid then the hands will move on one minute.

So... if I could charge a 470uF capacitor to 24v and then let it discharge through the clock and then spend the next 59.9 seconds recharging the capacitor it would be good.

Given a supply of 9v I need to triple the supply...

During the 100mS of discharge the current due to the clock needs to go through all the capacitors... does that imply that it is also going through the PWM pin and therefore I shouldn't actually drive the capacitors directly from my Microcontroller?  It's around 2.5mA?

Any pointers appreciated... I've never tried anything like this before.

Offline MarkR42

  • Regular Contributor
  • *
  • Posts: 98
  • Country: gb
Re: EEVblog #473 - Microcontroller Voltage Doubler
« Reply #28 on: November 19, 2018, 10:13:07 am »

Could this technique be used, theoretically, to drive a much larger current, if instead of taking the pin directly from a micro. it was from a suitably rated H-bridge (or half H-bridge) chip? Assuming all caps and diodes are suitably rated?

Those chips also usually have a current limit built-in, so they won't get fried so easily.

I know this was originally intended for driving tiny loads, but what about, say, a motor which draws 1-2A?

Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo