A DC-DC converter architecture for low-power, high-resistance thermoelectric generators for use in body-powered designs

This thesis presents a low power DC-DC converter suitable for harvesting energy from high impedance thermoelectric generators (TEGs) for the use in body powered electronics. The chip has been fabricated in a 130nm CMOS technology. To meet the power demands of body powered networks, a novel dual-path architecture capable of efficiently harvesting power at levels below 5 μW has been developed. To control the converter, a low power control loop has been developed. The control loop features a low-power clock and a pulse counting system that is capable of matching the converter impedance with high impedance TEGs. The system consumes less than 900nW of quiescent power and maintains an efficiency of 68% for a load of 5 μW

A 5mW batteryless start-up boost charger for wireless power transfer

An boost battery charger is proposed to operate on 0V battery voltage in wireless power transfer (WPT) system for bio-medical application. The proposed battery charger for bio-medical application should be operated on low power. Thus, our target input power is very low such as 5mW???10mW and target output power is 2mW???5mW. Because the proposed battery charger starts up using rectifier output voltage, it doesn't need to consider battery voltage at start-up situation. Also our structure supply power to battery on constant current (CC) Mode. And we proposed burst mode (BM) protection to protect circuit and battery. The proposed battery charger is implemented using 0.18um CMOS technology. As a result, it achieves 83% efficiency and batteryless start-up and CC Mode operation. ?? 2017 IEEE