Analysis and Design of Power Management System for Wireless Power Transfer Circuits

The advent of wireless technology has revolutionized handheld and wearable devices. When comparing battery technology to other aspects of portable device technology, it becomes evident that it has been a bottleneck in the innovation of miniaturized electronic devices. In this paper, a wireless power harvesting system was designed and analyzed. The Wireless Power Transfer (WPT) chip was produced using 2.5 V devices in a 90 nm CMOS process. The target performance was to wirelessly power a 10 mA load with 1.8 V. The objective of the WPT system implemented in this work can be achieved with a system efficiency greater than 50%. The inductive link power transfer efficiency for strong and moderate coupling was reasonably good, yielding a measured WPT system efficiency of 46.1%, considering the rectifier only as the Power Management System (PMS).