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Comparison of charge pump circuits for half-bridge inverters

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3 Author(s)
Khoo, G.F.W. ; Dept. of Eng., Cambridge Univ., UK ; Carter, D.R.H. ; McMahon, R.A.

Charge pumps can be used to generate floating voltage supplies owing to their low input to output voltage drop and circuit simplicity. When used to power the high-side circuitry of half-bridges, the charge pump circuit can be simplified significantly by replacing the function of the dedicated pump oscillator with the switching action of the half-bridge output voltage. Three classes of the auto charge pump are identified, and a model is derived for each of the circuits. Using the model, auto charge pump circuits are designed for use in a half-bridge inverter and tested. The tests show a good match between the models and the experimental results. Finally, a comparison of the various auto charge pump circuits is made

Published in:

Circuits, Devices and Systems, IEE Proceedings -  (Volume:147 ,  Issue: 6 )