Abstract
In this brief, a linear-based battery charger is proposed, designed, fabricated in a 180 nm SOI process, and measured. The design is aimed to charge low-power wearable or implantable medical devices through a wireless power transfer (WPT) link at a transfer distance of several centimeters, where the available power is in the range of a few milliwatts. A novel self-turn-on/off circuit was implemented, preventing quiescent power consumption while the WPT link is inactive. The compact proposed circuit requires a remarkable low chip area of 0.023 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> . In measurements, using a 3.7 V (nominal) lithium-Ion battery, a configurable charging current from 500 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mu \text{A}$ </tex-math></inline-formula> to 20 mA was achieved, while presenting a competitive efficiency with the state-of-the-art. The automatic transition between the constant current (CC) and constant voltage (CV) charging phases is shown in measurements.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
