Research And Design Of Rectifier Circuit With Wide Input Power Range

With the research of energy transmission methods,wireless power transfer(WPT)technology has been widely used in biomedical equipment,Internet of Things systems,and mobile equipment energy supply.Without any wires or conductors,this is a technology that transfers energy from the energy transmitting source to the energy receiving end.One of the important indexes to measure the performance of a wireless energy transmission system is the transmission efficiency of the system.The rectifier circuit is an important part of the wireless energy transmission system,and the rectification conversion efficiency has a direct and decisive influence on the transmission efficiency of the system.In the actual application of wireless energy transmission system,the rectifier diode is limited by the turn-on voltage,which leads to the reduction of rectification efficiency;and the distance from the radiation source is different,the energy density may fluctuate greatly,and the wireless energy transmission system needs sufficient stability.Therefore,research on rectifier circuits that can improve rectification efficiency in a low input power range and maintain stable operation in a wide power range has important practical value.According to the above requirements,this article focuses on broadening the applicable power range of the rectifier circuit.The main research contents are as follows:A wide power range rectifier circuit based on the combination of impedance compression technology and energy recovery technology.Due to the large fluctuation range of the input power of the rectifier circuit,a wide power range rectifier circuit combining impedance compression technology and energy recovery technology is proposed.Use impedance compression technology to compress the input impedance,reduce the sensitivity of impedance nonlinear changes,and broaden the input power range.At the same time,energy recovery technology is used to combine low-power and high-power rectifier branches to broaden the power range of the total rectifier circuit and maintain high rectification efficiency.This paper analyzes the working principle of the rectifier circuit,impedance compression technology and energy recovery technology and makes a detailed theoretical analysis.A rectifier circuit with an operating frequency of 2.45 GHz is designed for software simulation and actual circuit testing.In the test results,the highest rectification efficiency is69.24%,and the applicable power range can reach 30 d B,which verifies the effectiveness of the design idea of combining the two technologies to broaden the input power range of the rectifier circuit.A new type of low-power range high-efficiency rectifier circuit based on multi-tone signal waveform optimization.A scheme of using the multi-tone signal waveform as the input signal of the rectifier circuit is proposed.The multi-tone signal waveform optimization technology optimizes the peak-to-average ratio and duty cycle of the multi-tone signal by adjusting the frequency,amplitude,phase,and the number of tonal signals of each tone signal.This makes it easier to turn on the rectifier diode at low input power,and improves the conversion efficiency of the rectifier circuit.In the thesis,the theoretical analysis of the working principle of multi-tone signal waveform optimization is carried out to find the key performance parameters of the design.A three-tone signal with tone frequencies of 913 MHz,915MHz,and 917 MHz and a multi-tone signal rectifier circuit with a working base frequency of 915 MHz are designed for simulation and circuit testing.In the circuit test,the highest rectification efficiency of the rectifier circuit is 51.4%.When the input power is-25 d Bm,the rectification conversion efficiency is 20.0%;when the input power is-20 d Bm,the rectification conversion efficiency is 33.5%,which is compared with the sinusoidal signal rectification circuit,Waveform optimization technology improves the rectification efficiency of the rectifier circuit at low input power,and verifies the correctness of the design.The concept of waveform optimization and control is also proposed to optimize the performance of the multi-tone signal rectifier circuit and conduct simulation tests.Combining the method of waveform control to improve efficiency and the design of wide power range rectifier circuit further expand the power dynamic range.The rectifier circuit in the design uses waveform optimization technology to improve rectification efficiency at low input power,and uses energy recovery technology to broaden the applicable power range,inventing a wide power range rectifier circuit that can cover the low input power range.This article analyzes whether the principles of waveform optimization and energy recovery technology affect each other.Then analyze the feasibility of the combination of waveform optimization technology and energy recovery technology.A three-tone signal with tone frequencies of 913 MHz,915MHz,and 917 MHz and a multi-tone signal wide power range rectifier circuit with a working base frequency of 915 MHz are designed for simulation and circuit testing.The circuit test result is that the highest efficiency is 55.3%.When the input power is-25 d Bm,the rectification efficiency is 20.8%;when the input power is-20 d Bm,the rectification efficiency is 30.8%;the input power is from-13 d Bm to 12 d Bm,and the rectification efficiency is greater than 40%.,the applicable power range can reach 25 d B.It proves the feasibility of combining the two technologies to improve the rectification efficiency in the low power range and broaden the applicable power range of the rectifier circuit.