Microwave wireless energy transmission system

Abstract

The invention relates to a microwave wireless energy transmission system which comprises a transmitting end and a receiving end serving as a rectifying antenna. The transmitting end is used for transmitting microwave signals and comprises a microwave signal source, a microwave direct-current power amplifier and a transmitting antenna. The receiving end comprises a receiving antenna and a rectifying circuit. The receiving antenna receives directionally transmitted microwave signals from a free space, the microwave signals are rectified and converted into direct current signals through the rectifying circuit, and the direct current signals are sent to a load. Compared with the prior art, the energy transmission distance and environment limitation are solved, the existing wire connection type charging and wireless charging modes are changed, and the system facilitates life, improves efficiency, and greatly reduces power consumption cost.

Description

technical field [0001] The invention relates to the technical field of power electronics and energy transmission radio frequency, in particular to a microwave wireless energy transmission system. Background technique [0002] In the 1960s, research on microwave energy transmission technology was carried out abroad. In the past few decades, Europe and the United States have carried out a large number of experiments on microwave energy transmission. technology. Microwave energy transmission technology plays a very important role in systems such as satellite solar power stations, RFID (Radio Frequency Identification), and floating platforms. Among them, microwave rectifier circuit is the key in microwave energy transmission technology. For the current research on microwave rectifier circuits, most rectifier circuits are designed using Schottky diodes. The power capacity of a single Schottky diode with a large power capacity is about 20d Bm, and the efficiency of Schottky diod...

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Problems solved by technology

[0004] In terms of power transmission, the DC output power of microwave rectifier circuits developed by most scholars is below 1w, which cannot meet the power supply requirements of watt-level terminals in application scenarios such as smart homes, telemedicine, and unmanned factories. Although the rectifier circuit can output a DC power of more than 1w, its circuit size is 180mm×180mm (about 1.5 times the free space wavelength corresponding to 2.45GHz). Such a large size makes the microwave rectifier circuit unable to communicate with the receiving terminal (such as Smartphones) and receiving array antennas (the distance between the array antenna elements is generally not greater than 1 times the wavelength) are well integrated together, and there are still the following deficiencies:

[0005] 1. It is difficult for the rectification efficiency and capacity of the rectification circuit to meet the application-level requirements at the same time

[0006] 2. If higher power transmission requirements are required, the size of the antenna will be limited to a large level, and it cannot be integrated with common powered terminals (such as mobile phones) on the market

[0007] 3. Microwave energy transmission has high requirements on signal frequency, and the efficiency will be greatly reduced if it deviates from the corresponding frequency band

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