TY  - JOUR
AB  - This paper presents a self-contained startup charging circuit designed for energy-harvesting batteryless IoT devices. The proposed circuit consists of a current-biasing block, a current mirror, a reference voltage generator, and a comparator circuit. The current-biasing circuit drives the current mirror, which supplies the charging current to the energy storage element. Simultaneously, the reference voltage generator?also biased by the current source?produces a stable DC reference voltage. When the energy storage device (e.g., a supercapacitor) lacks sufficient charge, the comparator enables the charging path by activating the current-biasing and mirror circuits. Once adequate energy is stored, the comparator disables these circuits to prevent overcharging. This self-contained solution is intended to autonomously initialize and manage the cold-start charging process in energy-harvesting systems without relying on external controllers. This paper highlights the circuit architecture and validated performance, demonstrating a charging current of up to 27 mA, a reference voltage of 700 mV, and an operating range from 0.9 V to 1.8 V across a temperature range of ?40 °C to 85 °C.
AU  - Libang, M
AU  - Adrivan, KK
AU  - Hora, JA
AU  - Avondo, CG
AU  - Comaling, RM
AU  - Zhu, X
AU  - Sun, Y
DA  - 2025/12/01
DO  - 10.3390/jlpea15040071
JO  - Journal of Low Power Electronics and Applications
PB  - MDPI
PY  - 2025/12/01
TI  - A Self-Contained Startup Charging Circuit for Energy-Harvesting Batteryless IoT Devices
VL  - 15
Y1  - 2025/12/01
Y2  - 2026/05/17
ER  -