US Patent 7729141 Three phase voltage tripler

A voltage tripler circuit includes a plurality of switches and first, second, and third capacitors each having first and second terminals that are selectively interconnected via the plurality of switches. The first capacitor charges to a supply voltage during a first phase. The second capacitor charges to two times the supply voltage during a second phase that follows the first phase. The third capacitor charges to three times the supply voltage during a third phase that follows the second phase. The voltage tripler circuit draws the same peak current from a source of the supply voltage at a beginning of each of the first, second, third phases.