A PPWM-Based CMOS Wireless Power Charger With Active Bias-Clamp Cascode Biasing and Load-Adaptive Rectifier Sizing

IF 1.8 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE open journal of circuits and systems Pub Date : 2026-01-01 Epub Date: 2026-03-24 DOI:10.1109/OJCAS.2026.3676921

Chih-Man Chang;Kea-Tiong Tang

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引用次数: 0

Abstract

This paper presents a wireless charging system for implantable medical devices, implemented in TSMC 0.18 um 1P6M CMOS and operating at 6.78 MHz with a single resonant coil pair. The proposed system supports a battery charging voltage range of

$2.6\sim 4.2$

V, covering trickle-charge (TC), constant-current (CC), constant-voltage (CV), and direct power (DP) modes. The charger provides a constant output current ranging from 5 mA to 50 mA. The overall system achieves a peak efficiency of 88.9 %. The Active Bias-Clamp Cascode scheme is introduced to suppress over-voltage stress while significantly reducing the required bias capacitance, while the Load-Adaptive Rectifier Sizing (LARS) technique dynamically adjusts the rectifier conduction channel size according to load conditions. These techniques together improve efficiency and ensure robust operation across wide load variations, making the system well suited for highly constrained implantable applications.

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一种基于ppwm的有源偏置箝位级联偏置和负载自适应整流器尺寸的CMOS无线充电器

本文提出了一种用于植入式医疗设备的无线充电系统，该系统采用台积电0.18 um 1P6M CMOS芯片，工作频率为6.78 MHz，采用单谐振线圈对。该系统支持电池充电电压范围为2.6 ~ 4.2 V，包括涓流充电（TC）、恒流充电（CC）、恒压充电（CV）和直接供电（DP）模式。充电器提供从5毫安到50毫安的恒定输出电流。整个系统的峰值效率为88.9%。引入有源偏置箝位级配方案来抑制过电压应力，同时显著降低所需的偏置电容，而负载自适应整流器尺寸（LARS）技术根据负载情况动态调整整流器导通通道尺寸。这些技术共同提高了效率，并确保了在大负载变化下的稳健运行，使系统非常适合高度受限的植入式应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE open journal of circuits and systems

自引率

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审稿时长

19 weeks