please dont rip this site

Charge Pump DC to DC Power Converters

Simple Transformer based charge pump

Wagner Lipnharski says:

                            .------>|------------o---o  High V
                            |                    |
                            3| <- point A        |
                            3|                  --- HV C
                            3|                  ---
                            3|                   |
+1.5V----o------------------3| <- point B        |
         |                  3|                  GND
         R                  3|
         |      Nc----------3| <- point C
         o------P           3|
         |      Ne--.       3|
         |          |       3| <- point D
         |         GND       |
         |                   |

This circuit use a "one coil" transformer with two taps. At power on, all points have the same +1.5V.

  1. Resistor R makes the NPN transistor conducts
  2. Current Flows from ground to point C, via coil to B to +1.5Vdc.
  3. Point C is grounded
  4. Point D will develop a voltage below ground
  5. Point A will develop a voltage higher than +1.5V.
  6. Voltages goes increasing
  7. Voltage at point D is enough negative to cut off transistor via capacitor C.
  8. Transistor opens, Point C goes floating.
  9. High + Voltage at Point A is rectified and stored at HV C.
  10. Capacitor C (blocking the transistor) starts to discharge via R and coil taps D-B.
  11. Upon C discharged, R is enough to turn on transistor again.

Cycle repeats in a frequency determined by R, C, and the transformer itself.

This kind of configuration was widely used, using a cheap small transistor audio output transformer (transistor radio), connecting the secondary in series with the primary.

file: /Techref/power/transformerchargepump.htm, 2KB, , updated: 2009/10/1 15:51, local time: 2024/6/23 18:20,

 ©2024 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions?
Please DO link to this page! Digg it! / MAKE!

<A HREF=""> Simple Transformer based charge pump</A>

After you find an appropriate page, you are invited to your to this massmind site! (posts will be visible only to you before review) Just type a nice message (short messages are blocked as spam) in the box and press the Post button. (HTML welcomed, but not the <A tag: Instead, use the link box to link to another page. A tutorial is available Members can login to post directly, become page editors, and be credited for their posts.

Link? Put it here: 
if you want a response, please enter your email address: 
Attn spammers: All posts are reviewed before being made visible to anyone other than the poster.
Did you find what you needed?


Welcome to!


Welcome to!