Improved Self-Excited Resonant Wireless Power Transmission System

doi:10.16183/j.cnki.jsjtu.2022.427

Abstract

Abstract:

Aimed at the main power tube with problems of weak driving ability, poor soft switching performance, and large switching loss in a self-excited resonant wireless power transmission (WPT) system, an analysis of the working principle of resonant main circuit is conducted, which indicates that the root cause of the problem is that two uncontrollable diodes limit the driving resistance of main power tube. Thereofre, an improved self-excited resonant circuit is proposed by using a fully controlled low power switch instead of the diode. The circuit theoretical analysis of four working modes suggests that the main power tube of the improved circuit has a stronger driving ability. To further obtain the optimal parameters of the improved system, a nonlinear programming model of the system is established by considering the tolerance limit of each parameter, and a hybrid optimization algorithm is designed to obtain the system global optimal solution. A comparison of the results of system simulation and experimental prototype shows that the improved WPT system has an excellent soft switching performance. The temperature of the switch tube is reduced by about 7 ℃, and the efficiency is increased by about 4%.

Key words: wireless power transmission (WPT) system, self-excited resonance, parameter optimization, non-linear programming, genetic algorithm (GA)

CLC Number:

TM724

ZHAO Zhibin, LUO Bin, TANG Ting, WANG Chunfang, SUN Zhonghua. Improved Self-Excited Resonant Wireless Power Transmission System[J]. Journal of Shanghai Jiao Tong University, 2023, 57(7): 859-867.

Figures/Tables 16

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范围	k	f₀/kHz	L_P/μH	L_S/μH	C_P/μF	C_S/μF
下届	0.1	20	10	10	0.1	0.1
上届	0.25	35	100	100	1	1

条件	I_i/A	I_LP/A	I_LS/A	U_CP/V	I_CP/A	U_CS/V
仿真	0.99	7.80	2.06	53.2	8.19	33.1
实验	1.1	8.1	1.9	55.1	8.1	30.2

R_O/Ω	5	7	10	20	40
f₀/kHz	34.1	34.3	34.7	34.4	34.4
U_O/V	18.5	18.9	19.6	19.8	20.1