Title :
A high efficiency regulated charge pump over wide input and load range
Author :
Guo, Rong ; Yang, Liyu ; Huang, Alex ; Endredy, John
Author_Institution :
North Carolina State Univ., Raleigh, NC, USA
Abstract :
A multi-modes regulated charge pump with improved efficiency over wide input and load range is proposed in this paper. The output voltage is regulated to 5 V when input is 4.5-2.7 V. By alternating the switch network, it can realize 2x, 1.5x, and 1.33x conversion modes, which improves the efficiency over wide input range. During each mode, the output voltage is regulated by a controlled current source. The regulated charge pump is designed for a very wide load range (10 mA to 500 mA). A hybrid control scheme is proposed and analyzed to achieve a high efficiency over desired load range. Both of the simulation and test results are provided to verify the control scheme. The results show that the total loss at light load can be reduced by 56% to 83%.
Keywords :
charge pump circuits; constant current sources; switched networks; controlled current source; conversion modes; current 10 mA to 500 mA; hybrid control scheme; multi-mode regulated charge pump; switch network; voltage 4.5 V to 2.7 V; voltage 5 V; Batteries; Charge pumps; DC-DC power converters; Lighting control; Optical modulation; Pulse modulation; Regulators; Switches; Testing; Voltage;
Conference_Titel :
Applied Power Electronics Conference and Exposition (APEC), 2010 Twenty-Fifth Annual IEEE
Conference_Location :
Palm Springs, CA
Print_ISBN :
978-1-4244-4782-4
Electronic_ISBN :
1048-2334
DOI :
10.1109/APEC.2010.5433355
