A Fully Integrated Multimode Wireless Power Charger IC With Adaptive Supply Control and Built-In Resistance Compensation

We present a fully integrated multimode lithium-ion battery charger integrated circuit (IC) for wireless power charging applications. The proposed charger IC integrates an analog block for battery charging, a digital control block, an analog-to-digital converter, and memory on a single chip. To impr...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2015-02, Vol.62 (2), p.1251-1261
Main Authors: Quang, Phu Ho Van, Tien Ha, Thanh, Lee, Jong-Wook
Format: Article
Language:English
Subjects:
Adaptive control systems
Batteries
Battery chargers
Blocking
Charging
Compensation
Digital
Digital control
Electric potential
Electronic devices
Integrated circuits
Regulators
Voltage
Voltage control
Wireless communication
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We present a fully integrated multimode lithium-ion battery charger integrated circuit (IC) for wireless power charging applications. The proposed charger IC integrates an analog block for battery charging, a digital control block, an analog-to-digital converter, and memory on a single chip. To improve the charging efficiency, the supply voltage of the charger IC is controlled by an adaptive low-dropout (LDO) regulator. A series-voltage feedback path is formed along the LDO regulator and multimode level shifter, which regulates the supply voltage to closely follow the battery voltage. For a smooth transition during multimode charging, we propose a new approach for built-in resistance compensation. The digital control block of the charger IC is designed in accordance with the Qi standard. The battery charger IC is fabricated in a one-poly six-metal 0.18-μm CMOS process. Integrated with the digital control block and memory, the core area of the multimode charger IC is 0.9 × 1.4 mm 2 . The input voltage ranges from 4.8 to 5 V. The output voltage is 4.2 V in constant-voltage mode. The charging current in constant-current mode is 450 mA. The maximum and average charging efficiencies are 83% and 79%, respectively.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2014.2336618