Radio frequency energy acquisition system based on dynamic impedance matching technology

A technology of radio frequency energy and collection system, applied in current collectors, electric vehicles, electrical components, etc., can solve the problems of reduced energy collection efficiency and difficulty in achieving collection effects.

Inactive Publication Date: 2016-08-03
FUDAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Outside of these ranges, the efficiency of energy harvesting drops dramatically making harvesting difficult to achieve

Method used

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  • Radio frequency energy acquisition system based on dynamic impedance matching technology
  • Radio frequency energy acquisition system based on dynamic impedance matching technology
  • Radio frequency energy acquisition system based on dynamic impedance matching technology

Examples

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Embodiment Construction

[0026] The present invention is further described in detail by a specific embodiment below.

[0027] image 3A complete RF energy harvesting system based on the dynamic impedance matching technology proposed by the present invention is given. Wherein, the configurable matching network ( 8 ) is composed of a binary-coded variable capacitor array, whose capacitance can be controlled by m-bit binary signals D0~Dm. The output voltage of the rectifier (2) is Vrec. The rectifier output voltage detection module (6) is simplified into a wire (13), which directly transmits the voltage Vrec to the matching network configuration bit generation module (9). The battery charging circuit (4) consists of a comparator (16) and a power transistor (10). When Vrec is higher than the battery (5) voltage, the comparator (16) adjusts the gate voltage of the power transistor (10) to turn it on, and the rectifier (2) charges the battery (5); when Vrec is lower than the battery (5) voltage When , t...

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Abstract

The present invention belongs to the integrated circuit design technology field, in particular relates to a radio frequency energy acquisition system based on a dynamic impedance matching technology. The system of the present invention is characterized by adding a configurable matching network module, a rectifier output voltage detection module, a charging current detection module and a matching network configuration bit generation module on the basis of the conventional radio frequency energy acquisition system, wherein the matching network configuration bit generation module is used to switch two work modes of voltage sampling and current sampling, and determine an adjustment mode of a matching network according to the sampled voltage and current values. According to the present invention, by monitoring the matching status of a resonant cavity real-timely and adjusting the circuit equivalent impedance during an energy acquisition process, the resonant cavity is always located in an ideal matching state, thereby realizing the radio frequency energy acquisition of higher efficiency within a larger input frequency band and incident energy range.

Description

technical field [0001] The invention belongs to the technical field of integrated circuit design, and in particular relates to a system for radio frequency energy collection and power management. Background technique [0002] With the advent of the post-Moore era, the application field of integrated circuits is increasingly expanding towards distributed circuits and systems. Emerging wearable electronics, IoT sensor nodes, and commercial small medical electronic devices have developed rapidly in recent years. Most of these new applications have the characteristics of small size, low energy consumption, and large quantity. For electronic devices with such characteristics, due to the relatively scattered distribution and the large number of mobile devices, battery power supply has become the preferred power supply solution. However, due to the small size of these applications, the optional battery capacity is limited (otherwise the battery will occupy most of the volume of s...

Claims

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Application Information

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IPC IPC(8): H02J7/02
CPCH02J7/025
Inventor 王彧张怡云闫娜闵昊史传进
Owner FUDAN UNIV
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