An On-/Off-Time Sensing-Based Load-Adaptive Mode Control of Triple Mode Buck Converter for Implantable Medical Devices

被引：2
|
作者：
Park, Woojin [1 ]
Namgoong, Gyeongho [1 ]
Choi, Eunho [1 ]
Bien, Franklin [1 ]
机构：
[1] Ulsan Natl Inst Sci & Technol UNIST, Ulsan 44919, South Korea
来源：
IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS | 2023年 / 17卷 / 03期
关键词：
Implantable medical devices (IMDS); mode control; power conversion efficiency (PCE); pulse frequency modulation (PFM); pulse width modulation (PWM); wide load range; wireless power transfer (WPT); ULTRA-LOW-POWER;
D O I：
10.1109/TBCAS.2023.3238740
中图分类号：
R318 [生物医学工程];
学科分类号：
0831 ;
摘要：
Wireless power transfer (WPT) technology applied to implantable medical devices (IMDs) significantly reduces the need for battery replacement surgery health conditions. This paper presents an on-/off-time sensing-based load-adaptive mode control of triple mode buck converter for implantable medical devices; the converter can adjust the control mode for low power consumption and achieve high power conversion efficiency (PCE) under a small active area. The three modes in the proposed system are the pulse width modulation (PWM), pulse frequency modulation (PFM), and ultra-low power (ULP) modes. The on-time sensor can be used to adjust the system from PWM to PFM modes, and the off-time sensor can be used to adjust the system from PFM to ULP modes. It is fabricated using TSMC 0.18 mu m CMOS technology. The input voltage lies in the range 2.2-5.0 V, the output voltage is 1.8 V, and the load current lies in the range 0.05-200 mA (x4000). The experimental results demonstrate the seamless mode transition under the step up/down load transient response. The peak PCE is approximately 94.3% at the 80 mA and the minimum PCE is approximately 65.4% within the load current range.
引用
收藏
页码：585 / 597
页数：13
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