A Unified Amplifier-Based CC-CV Linear Charger for Energy-Constrained Low-Power Applications
| Autor: | Edgar Sanchez-Sinencio, Minglei Zhang, Kyoohyun Noh |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Physics
Phase transition Transconductance Amplifier 020208 electrical & electronic engineering Phase (waves) Battery (vacuum tube) Biasing 02 engineering and technology Topology Power (physics) MOSFET 0202 electrical engineering electronic engineering information engineering Electrical and Electronic Engineering |
| Zdroj: | IEEE Transactions on Circuits and Systems II: Express Briefs. 66:377-381 |
| ISSN: | 1558-3791 1549-7747 |
| DOI: | 10.1109/tcsii.2018.2858539 |
| Popis: | This brief presents a linear charger architecture based on a single amplifier for regulation and the charging phase transition from the constant-current (CC) phase to the constant-voltage (CV) phase. The proposed unified amplifier is based on stacked differential pairs that share the bias current. Its current-steering property removes multiple amplifiers for regulation and the CC-CV transition, and achieves high unity-gain loop bandwidth for fast regulation. The proposed charger with the maximum charging current of 25 mA is fabricated in 0.35- $ \mu \text{m}$ CMOS process. While the unified amplifier is biased with 20 $\mu \text{A}$ , the charger achieves a peak charger efficiency of 94% and average charger efficiency of 88% with an 80-mAh Li-ion polymer battery. |
| Databáze: | OpenAIRE |
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