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1. THERMAL ENERGY HARVESTING WIRELESS SENSOR
NODE IN ALUMINUM CORE PCB TECHNOLOGY
ABSTRACT
This paper reports the design of a self-powered telemetric wireless sensor node for
temperature measurement. The device is realized with a conventional off-the-shelf
thermoelectric generator as a power source. It is sandwiched between two aluminum core printed
circuit boards (PCBs). One board is exposed to the heat source and has the role of a heat
collector, whereas another one with the mounted low profile heatsink acts as a heat spreader.
Electronic components of the node are placed on the inner surfaces of the boards. Implemented
step-up circuitry is accommodated to achieve stabile cold boot of the node at a low temperature
difference between its hot side and ambient (less than 15 °C), even when it is in thermally
inefficient position. Operational autonomy of the node in the absence of the heat source is
extended by 30% comparing with the common stepup circuitry implementation. The aluminum
core PCBs provide node simplicity and compactness, with small overall dimensions