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Charge Pump DC to DC Power Converters

Simple Transformer based charge pump

Wagner Lipnharski says:

                                 Diode
                            .------>|------------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       |
         |                   |
         '---------||--------'
                   C

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.

See also:


file: /Techref/power/transformerchargepump.htm, 2KB, , updated: 2009/10/1 14:51, local time: 2021/11/29 19:04,
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