基于FSK的LCLP型ICPT系统信号传输方法研究

Research on signal transmission method of LCLP type ICPT system based on FSK

摘要:

针对传统感应耦合电能传输(Inductive CouplingPower Transfer, ICPT)系统存在的开关管损耗较大和变换器工作时产生电压或电流谐波等问题,基于LCLP型谐振拓扑结构,提出了一种以ICPT系统作为主电路的电能与频移键控调制(FSK)信号同步传输方法.通过LCLP型ICPT系统原理分析和信号调制解调策略研究建立了电能与信号同步传输数学模型;以电能传输能力最大化为前提分析计算了系统参数,搭建了仿真模型,进行验证分析.仿真结果表明,非噪声环境下的误码率为零;噪声环境下,信噪比(Signal Noise Ratio, SNR)＜-4时,误码率随SNR的增大而减小,直至SNR≥-4时,误码率为零.在信号传输电路引入前后,谐振输出电压幅值基本不变,BODE图曲线变化趋势以及衰减值不变,负载处谐波畸变率降为13.24%.系统在保证低误码率信号传输的同时没有对电能传输造成明显影响.

Abstract:

The traditional inductively coupled power transmission system has problems such as large loss of switches and voltage or current harmonics generated when the converter is working. This paper, based on the LCLP topology, proposes a method for synchronous transmission of electrical energy, which regards the ICPT system as the main circuit and Frequency Shift Keying (FSK) modulation signal. Through the principle analysis of LCLP type ICPT system and the research of signal modulation and demodulation strategy, a mathematical model was established for the simultaneous transmission of electric energy and signal. On account of the premise of maximizing the power transmission capability, the system parameters were calculated, and the simulation model was built for verification and analysis. The simulation results show that the Bit Error Rate (BER) is zero in nonnoise environment; In the noise environment, the BER decreases with the increase of SNR when SNR＜-4, the BER is zero when the SNR ≥-4. Before and after the introduction of the signal transmission circuit, the resonant output voltage amplitude is basically unchanged, the BODE curves’ change trend and attenuation value are unchanged as well, and the harmonic distortion rate at the load is reduced to 13.24%. The system has no significant impact on power transmission while transmitting signal in low BER condition.