Energy Management Circuit for Thermoelectric Generator and Indoor Light Energy Harvester to Operate Wireless Sensor Nodes by a Temperature Difference of 5°C

To expand the application of wireless sensor nodes using energy harvesting, an energy management circuit that combines energy harvesting from indoor light and waste heat is proposed. The circuit is composed of an analog LSI circuit and achieves energy management with a power consumption of 1 µW. The circuit has been demonstrated to generate 120 µW of power using waste heat with a temperature difference of 5°C in a low-light environment of approximately 50 lx.