Radio frequency energy collecting device for power supply of wireless sensing node

Abstract

The invention discloses a radio frequency energy collecting device for the power supply of a wireless sensing node. The radio frequency energy collecting device includes a broadband receiving antenna for receiving radio frequency signals, an impedance matching network which is located between the broadband receiving antenna and a radio frequency-to-direct current conversion circuit, the radio frequency-to-direct current conversion circuit which is connected with the output end of the impedance matching network and adopts a rectifier to convert radio frequency energy which has been subjected to impedance matching into direct current voltage, a voltage monitoring module which is located between the radio frequency-to-direct current conversion circuit and a power management module and is used for adjusting voltage charged to a circuit and adjusting voltage on charge storage devices, the charge storage devices which are located between the radio frequency-to-direct current conversion circuit and the voltage monitoring module, between the voltage monitoring module and the power management module, as well as between the power management module and a powered wireless sensing node, and the power management module which is located between the voltage monitoring module and the wireless sensing node, wherein the power management module is connected with the radio frequency-to-direct current conversion circuit, so that a feedback loop can be formed.

Description

technical field [0001] The present invention relates to a radio frequency (RF) energy collection device used for power supply of wireless sensor nodes, in particular to a radio frequency energy collection device for supplying power to wireless sensor network nodes by using radio frequency signals propagated in free space. Background technique [0002] Wireless sensor network (WSN) is one of the core technologies of the Internet of Things (TOT), which plays an increasingly important role in daily life and industrial production, and its basic unit is a wireless sensor node. The main characteristics of wireless sensor node power supply are low current and constant load. At present, primary batteries are mainly used. The existing problems are that the primary batteries will eventually run out, and the replaced waste batteries will pollute the environment. Secondly, in some applications The medium battery is difficult or expensive to replace, which restricts the continuous workin...

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Problems solved by technology

The main characteristics of wireless sensor node power supply are low current and constant load. At present, primary batteries are mainly used. The existing problems are that the primary batteries will eventually run out, and th

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