Title :
An efficiency-enhanced auto-reconfigurable 2x/3x SC charge pump for transcutaneous power transmission
Author :
Zhang, Xiwen ; Lee, Hoi
Author_Institution :
Dept. of Electr. Eng., Univ. of Texas at Dallas, Richardson, TX, USA
Abstract :
An auto-reconfigurable 2x/3x switched-capacitor charge pump (SC-CP) for transcutaneous power transmission is presented in this paper. The proposed SC-CP can automatically configure its own voltage conversion ratio by adaptive control circuitry for maintaining high efficiencies of the DC/DC regulator under coupling variations. An adaptive deadtime control is developed to improve the efficiency of the proposed SCCP by minimizing the shoot-through current. Implemented in a standard 0.35-mum n-well CMOS process, the proposed SC-CP achieves peak power efficiencies of 95% (2x) and 92% (3x). The efficiency of the DC/DC regulator with the proposed SC-CP is improved by >25%, compared to that using the conventional 3x SC-CP, when the input voltage varies from 1.6 V to 2.4 V.
Keywords :
DC-DC power convertors; charge pump circuits; switched capacitor networks; CMOS process; DC-DC regulator; adaptive control circuitry; adaptive deadtime control; efficiency-enhanced auto-reconfigurable SC charge pump; switched-capacitor charge pump; transcutaneous power transmission; Adaptive control; Automatic control; CMOS process; Charge pumps; Coupling circuits; Power transmission; Programmable control; Regulators; Voltage;
Conference_Titel :
Custom Integrated Circuits Conference, 2009. CICC '09. IEEE
Conference_Location :
San Jose, CA
Print_ISBN :
978-1-4244-4071-9
Electronic_ISBN :
978-1-4244-4073-3
DOI :
10.1109/CICC.2009.5280827
