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

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.