Design A Battery-Less Power Management System Through Energy Harvesting Circuit

Yap, Jim Hui (2018) Design A Battery-Less Power Management System Through Energy Harvesting Circuit. Project Report. UTeM, Melaka, Malaysia. (Submitted)

Text (24 Pages) Design A Battery-Less Power Management System Through Energy Harvesting Circuit.pdf - Submitted Version Download (573kB)

Abstract

Thermoelectric energy harvesting is a promising way of replacing battery in many low power devices such as Wireless Body Area Network (WBAN), animal tracking system, biomedical implant devices and etc. Due to its ability in converting thermal gradient into an usable electrical energy, it has been applied to harvest waste body heat to power up low power devices such as WBAN. However, the thermal gradient between body temperature and ambient temperature can only achieve from one to four degree Celsius. One degree Celsius produces thirty millivolts. Therefore, in this work, Complementary Metal-Oxide-Semiconductor (CMOS) voltage booster and a dynamic closed loop power management is designed and integrated to boost a 30mV from output of TEG to a regulated 1.2V. Digitally control oscillator is designed to control the switching period of transistors in voltage booster. Besides, RF rectifier is utilized to act as a start-up mechanism for voltage booster and power up subsequent circuits in dynamic closed loop power management. Low Dropout Voltage Regulator is designed to regulate 1.2V. At last, Power on Reset is used to monitor the power down of the system. With these energy harvesting circuits, a battery-less power management system is proposed. The design is developed in Silterra 130nm technology by using Cadence software.

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