DC-DC-converter with input polarity detector for thermogenerators
This paper presents a DC-DC converter, which automatically detects the polarity of its input voltage. Thus, the converter can work with both positive and negative input voltages. It is intended to be used by energy harvesting thermogenerators with output voltages below 300 mV where hot and cold side can exchange. A test design achieved an efficiency of 65 % for an input voltage of 200 mV and an output voltage of 2.5 V with an output power of 4 mW. This first design was built with discrete components, but can also be integrated on a chip with few external components (such as transformer and input/output capacitor).