An Integrated Chip High-Voltage Power Receiver for Wireless Biomedical Implants

Vijith Vijayakumaran Nair and Jun Rim Choi
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Vijith Vijayakumaran Nair: School of Electronics Engineering, Kyungpook National University, Buk-gu, Daegu 702-701, Korea
Jun Rim Choi: School of Electronics Engineering, Kyungpook National University, Buk-gu, Daegu 702-701, Korea

Energies, 2015, vol. 8, issue 6, 1-21

Abstract: In near-field wireless-powered biomedical implants, the receiver voltage largely overrides the compliance of low-voltage power receiver systems. To limit the induced voltage, generally, low-voltage topologies utilize limiter circuits, voltage clippers or shunt regulators, which are power-inefficient methods. In order to overcome the voltage limitation and improve power efficiency, we propose an integrated chip high-voltage power receiver based on the step down approach. The topology accommodates voltages as high as 30 V and comprises a high-voltage semi-active rectifier, a voltage reference generator and a series regulator. Further, a battery management circuit that enables safe and reliable implant battery charging based on analog control is proposed and realized. The power receiver is fabricated in 0.35-?m high-voltage Bipolar-CMOS-DMOStechnology based on the LOCOS0.35-?m CMOS process. Measurement results indicate 83.5% power conversion efficiency for a rectifier at 2.1 mA load current. The low drop-out regulator based on the current buffer compensation and buffer impedance attenuation scheme operates with low quiescent current, reduces the power consumption and provides good stability. The topology also provides good power supply rejection, which is adequate for the design application. Measurement results indicate regulator output of 4 ± 0.03 V for input from 5 to 30 V and 10 ± 0.05 V output for input from 11 to 30 V with load current 0.01–100 mA. The charger circuit manages the charging of the Li-ion battery through all if the typical stages of the Li-ion battery charging profile.

Keywords: high-voltage bridge rectifier; low drop-out voltage; regulator; battery chargercircuit; power efficiency; wireless power receiver (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2015
References: View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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