基于开/关时间感应的植入式医疗设备用三态降压转换器自适应负载模式控制
An On-/Off-Time Sensing-Based Load-Adaptive Mode Control of Triple Mode Buck Converter for Implantable Medical Devices.
出版信息
IEEE Trans Biomed Circuits Syst. 2023 Jun;17(3):585-597. doi: 10.1109/TBCAS.2023.3238740. Epub 2023 Jul 12.
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 µm 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.
无线电能传输 (WPT) 技术应用于植入式医疗设备 (IMD) 显著减少了电池更换手术的需求，改善了健康状况。本文提出了一种基于导通/关断时间感应的三模式降压转换器的负载自适应模式控制，用于植入式医疗设备；该转换器可以调整控制模式以实现低功耗，并在小有源面积下实现高功率转换效率 (PCE)。所提出系统的三种模式是脉冲宽度调制 (PWM)、脉冲频率调制 (PFM) 和超低功率 (ULP) 模式。导通时间传感器可用于将系统从 PWM 模式调整为 PFM 模式，关断时间传感器可用于将系统从 PFM 模式调整为 ULP 模式。该转换器采用 TSMC 0.18 µm CMOS 技术制造。输入电压范围为 2.2-5.0 V，输出电压为 1.8 V，负载电流范围为 0.05-200 mA（x4000）。实验结果表明，在升压/降压负载瞬态响应下实现了无缝模式转换。在 80 mA 时，峰值 PCE 约为 94.3%，在负载电流范围内，最小 PCE 约为 65.4%。
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