Analysis of a charge pump power supply with a floating voltage reference

被引：14

作者：

Khoo, G.F.W. ^{[1
]}

Carter, Douglas R. H. ^{[1
]}

McMahon, R.A. ^{[1
]}

机构：

[1] Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, United Kingdom

来源：

| 2000年 / IEEE, Piscataway, NJ, United States卷 / 47期

关键词：

Bridge circuits - Diodes - Electric charge - Electric currents - Electric inverters - Power supply circuits - Transients - Variable frequency oscillators - Voltage measurement;

D O I：

10.1109/81.886979

中图分类号：

学科分类号：

摘要：

Charge pump circuits can be used to generate floating power supplies for the high side circuitry of half-bridge inverters. Because of its small input to output voltage drop, the charge pump circuit supports a wide range of supply voltages and is ideal for powering high side circuitry with low voltage requirements. A model for the operation of the charge pump is derived, which offers an improvement over previous models by accounting for the effect of a load current and which includes a variable pump oscillator duty term and current dependent diode models to allow for a more accurate prediction of the charge pump behavior. More importantly, the model also predicts the critical effects of switching transients at the output of the half-bridge on the charge pump. The model has been verified against experiments and shows a good agreement. Using the model, a charge pump circuit was designed for use as the high side power supply for a typical half-bridge inverter.

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