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| A Current Harmonic Suppression Method for Inductively Coupled Power Transfer System Based on Auxiliary Pickup Module |
| Yang Jixin1,2, Shi Liming1,2, Yin Zhenggang1, Fan Manyi1, Li Yaohua1,2 |
1. Key Laboratory of Power Electronics and Electric Drive Institute of Electrical Engineering Chinese Academy of Sciences Beijing 100190 China;
2. University of Chinese Academy of Sciences Beijing 100049 China |
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Abstract Due to convenience, safety, and aesthetics, inductively coupled power transfer (ICPT) systems have been applied in various applications. However, the output current harmonics of the high-frequency inverter in the ICPT system can cause the switch’s operation and circuit control problems, increasing the additional core loss in coils. Therefore, it is important to suppress the current harmonics. As an example, the 3rd current harmonic is analyzed in detail.
Firstly, the mathematical model of the ICPT system is established based on the S-S compensation circuit. The mechanism of current harmonics generation and the factors affecting the amplitude of current harmonics are analyzed. Due to the square wave output voltage and the existence of dead time, the output current contains a large number of harmonics. A significant distortion of the output current of the high-frequency inverter will be caused under light load conditions.
Then, a current harmonic suppression method for ICPT system based on auxiliary pickup module is proposed to suppress the output current harmonics of the high-frequency inverter. The natural resonant frequency of the auxiliary pickup module is set to three times the fundamental frequency, and the feasibility of suppressing the 3rd current harmonic is demonstrated through theoretical analysis. Furthermore, the quality factor of the auxiliary pickup module is designed to avoid cross interference between pickup coils, thereby not affecting the power transmission of the ICPT system.
Finally, simulation and experimental results verify the theoretical analysis and the proposed method. The amplitude of the 3rd current harmonic and the total harmonic distortion (THD) are reduced. Compared with the traditional ICPT system, the system efficiency is improved effectively under light load conditions.
The following conclusions can be drawn. (1) When the quality factor Qp of the primary side decreases or the quality factor Qs1 increases, the amplitude of the 3rd current harmonic increases, leading to an increase in the THD of the output current. Conversely, the amplitude of the 3rd current harmonic decreases. (2) In the ICPT system based on the auxiliary pickup module, the amplitude of the 3rd current harmonic and THD of the output current of the high-frequency inverter are significantly reduced, and the system efficiency remains almost unchanged. THD decreased by 12.57% and 8.46% in simulation and experiment. Under light load conditions, the system efficiency increased by 0.52%. (3) The proposed method is simple and cost-effective without power adjustment range limitation.
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Received: 26 January 2024
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2024, Vol. 39 
