DC-DC voltage converter and conversion method

摘要

A DC-DC converter comprises a capacitor arrangement and a switching arrangement for controlling coupling of the capacitor arrangement to a converter input during a loading phase and to a converter output during a storing phase. The converter cycles between charge pumping stages and charge holding phases, giving rise to a converter switching frequency. A variable output load is controlled thereby to maintain a constant converter switching frequency.

主权项

1. A DC-DC converter, comprising:
a capacitor arrangement; a switching arrangement for controlling coupling of the capacitor arrangement to a converter input during a loading phase and to a converter output during a storing phase; a circuit for controlling the switching arrangement to alternate the loading and storing phases during an output charge stage and to cease, in response to a voltage on the converter output, alternation between the loading and storing phases during an output hold stage, the cycling between stages giving rise to a converter switching frequency; a variable output load configured to vary an output load on the converter output and to source current during at least the output hold stage; and a feedback circuit for controlling the variable output load using the switching frequency as a feedback control parameter thereby to maintain the converter switching frequency at a desired frequency.