Transcription of SECTION 4 SWITCHED CAPACITOR VOLTAGE CONVERTERS …
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SWITCHED CAPACITOR VOLTAGE 4 SWITCHED CAPACITOR VOLTAGECONVERTERSWalt Kester, Brian Erisman, Gurjit ThandiINTRODUCTIONIn the previous SECTION , we saw how inductors can be used to transfer energy andperform VOLTAGE conversions. This SECTION examines SWITCHED CAPACITOR voltageconverters which accomplish energy transfer and VOLTAGE conversion two most common SWITCHED CAPACITOR VOLTAGE CONVERTERS are the VOLTAGE inverterand the VOLTAGE doubler circuit shown in Figure In the VOLTAGE inverter, thecharge pump CAPACITOR , C1, is charged to the input VOLTAGE during the first half ofthe switching cycle. During the second half of the switching cycle, its VOLTAGE isinverted and applied to CAPACITOR C2 and the load.
Switched capacitor voltage converters do not maintain high efficiency for a wide range of ratios of input to output voltages, unlike their switching regulator counterparts. Because the input to output current ratio is scaled according to the basic voltage conversion (i.e., doubled for a doubler, inverted for an inverter)
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