A rectifier with adjustable output voltage for wireless power transmission

Abstract

The invention discloses a rectifier with an adjustable output voltage for wireless electric energy transmission, and relates to the technical field of wireless power transmission. The front end of a rectifier is connected with a receiving coil and a receiving compensation capacitor, and the rear end of the rectifier is connected with a load. The rectifier comprises a bridge rectifier circuit and asynchronous signal detection circuit, and the bridge rectifier circuit comprises an MOS transistor 1, an MOS transistor 2, an MOS transistor 3, an MOS transistor 4 and corresponding MOS transistor driving chips ON1, ON2, ON3 and ON4. The synchronous signal detection circuit comprises a first-stage voltage division circuit used for collecting an input voltage of the rectifier, a second-stage voltage division circuit, a PI controller, a PWM, voltage comparators COMP1 and COMP2 and capacitors C4 and C5. The first-stage voltage division circuit comprises resistors R1, R2, R3 and R4, and the second-stage voltage division circuit comprises resistors R5 and R6. Through the combination of synchronous rectification and phase shift, the rectification loss of the wireless power transmission receiving end is reduced, and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of wireless power transmission, in particular to a rectifier with adjustable output voltage for wireless power transmission. Background technique [0002] Wireless power transmission, also known as wireless power transmission, non-contact power transmission, refers to the conversion of electrical energy into other forms of relay energy through the transmitter, and after a distance is transmitted through the air, the relay energy is converted into electrical energy through the receiver to achieve Wireless power transmission. The wireless power transmission system includes a wireless transmitter and a wireless receiver that transmit energy through a magnetic field. The rectifier (rectifier) ​​at the wireless receiver is a device that converts alternating current into direct current. It can be used for power supply and radio signal detection. The rectifier can be made of vacuum tubes. , ignition tube, solid si...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of low transmission efficiency caused by diode rectification loss at the wireless receiving end, and at the same time, the output voltage of diode rectification cannot be adjusted, which requires additional components, which reduces system efficiency and increases production costs. A rectifier with adjustable output voltage for wireless power transfer

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