A self-powered interface circuit for thermoelectric energy harvesting

Abstract

The invention discloses a self-powered interface circuit for thermoelectric energy collection, comprising a power level conversion module, a mV level voltage oscillator, a start tube, an output voltage sampling module, a reference source, a comparator, a control module, a driving module, a shaping module, the present invention generates the frequency signal required by the start-up circuit through the mV-level voltage oscillator, and realizes the start-up function through the start-up tube, the inductor and the parasitic diode of the power tube MP, and the comparator outputs the comparison result to the control module, and the control module is based on the result. Adjust the duty cycle of the square wave signal output by the shaping module and adjust the conduction time of the P-type power tube MP and N-type power tube MN in each cycle; after the driving module improves the driving ability of the square wave signal, it controls the power tube MP and the N-type power tube MN. The on-off of the power tube MN realizes energy collection, and stabilizes the output voltage within a certain range, and the interface circuit can work independently from power supply. The invention is suitable for micro-power consumption electronic devices and systems.

Description

technical field [0001] The invention relates to a thermoelectric energy collection circuit, in particular to a self-powered interface circuit for thermoelectric energy collection. Background technique [0002] Today, with the rapid development of science and technology, the application of micro-power electronic devices and systems is becoming more and more extensive. The development of micro-power consumption technology makes wireless sensor nodes play a big role in large-scale mechanical equipment, high-speed vehicles, medical monitoring and other fields. However, at present, most wireless sensors are powered by batteries, which not only brings pollution, but also increases the difficulty of maintenance and even leads to inaccurate monitoring results. Harvesting energy from the surrounding natural environment to achieve self-power supply is an effective solution to this problem. Thermal energy, solar energy, and mechanical energy exist in the natural environment. Thermal ...

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Problems solved by technology

However, at present, most wireless sensors are powered by batteries, which not only brings pollution, but also increases the difficulty of maintenance and even leads to inaccurate monitoring results.

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