Scholarlink

<p>This paper introduces a low-power voltage regulator designed to significantly reduce the cold-start time in energy-harvesting (EH) systems powered by piezo-electric harvesters (PEH) and triboelectric nanogenerators (TENG). These harvesters are characterized by high voltage and limited current outputs. Traditional EH systems bypass the energy charger during cold-start, requiring the battery to accumulate a large charge and causing the harvester to operate below its maximum-power point (MPP), resulting in a lengthy start-up delay. The proposed regulator directly utilizes the rectified DC output from the harvesters to immediately generate the required supply voltage. It features a digitally controlled loop with a constant-energy-per-cycle ring-oscillator (CERO) based comparator that adjusts the switching frequency based on the error between the target and sensed output voltage. This approach minimizes quiescent current to under 1 µA by further reducing speed at the target voltage. Fabricated using a 180&#xa0;nm bipolar-CMOS-DMOS (BCDMOS) process, the regulator operates over a wide frequency range from 7.018&#xa0;kHz to 6.674&#xa0;MHz at a 2&#xa0;V reference output. It achieves a transient response of approximately 138 µs for load current shifts from 100 nA to 10 µA, with a maximum load current of 15 µA. A load capacitor of 50 pF and a dropout voltage of 500 mV were utilized. The quiescent current is approximately 112 nA when active in low-power mode and about 2 nA when inactive with only power supply applied.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Low-Power Voltage Regulator with Adaptive Feedback Speed Control for High Voltage Energy Harvesting System

  • 期刊论文

  • 发表日期：

    2026年4月27日

查看全文
  • Wonil Seok,
  • Jungsik Kim,
  • Woong Choi,
  • Minseob Shim

摘要

This paper introduces a low-power voltage regulator designed to significantly reduce the cold-start time in energy-harvesting (EH) systems powered by piezo-electric harvesters (PEH) and triboelectric nanogenerators (TENG). These harvesters are characterized by high voltage and limited current outputs. Traditional EH systems bypass the energy charger during cold-start, requiring the battery to accumulate a large charge and causing the harvester to operate below its maximum-power point (MPP), resulting in a lengthy start-up delay. The proposed regulator directly utilizes the rectified DC output from the harvesters to immediately generate the required supply voltage. It features a digitally controlled loop with a constant-energy-per-cycle ring-oscillator (CERO) based comparator that adjusts the switching frequency based on the error between the target and sensed output voltage. This approach minimizes quiescent current to under 1 µA by further reducing speed at the target voltage. Fabricated using a 180 nm bipolar-CMOS-DMOS (BCDMOS) process, the regulator operates over a wide frequency range from 7.018 kHz to 6.674 MHz at a 2 V reference output. It achieves a transient response of approximately 138 µs for load current shifts from 100 nA to 10 µA, with a maximum load current of 15 µA. A load capacitor of 50 pF and a dropout voltage of 500 mV were utilized. The quiescent current is approximately 112 nA when active in low-power mode and about 2 nA when inactive with only power supply applied.