基于正交频分复用-多进制正交幅度调制的DC-DC变换器能量信息一体化技术

doi:10.19595/j.cnki.1000-6753.tces.221066

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Abstract The power electronic converters can transmit data information while converting and transmitting power based on the power information multiplexed modulation, which makes the power information integration a reality. Optimizing the voltage ripple caused by communication while improving its communication rate can enhance the power information integrated capability more comprehensively. Therefore, this paper proposes a power information integrated method based on orthogonal frequency division multiplexing-multiple quadrature amplitude modulation (OFDM-MQAM), and uses an interleaved parallel DC-DC converter to analyze and implement it.
Firstly, the output voltage ripple of the converter is analyzed based on the introduction of OFDM, MQAM, and power data dual-carrier modulation. The principle of the converter for OFDM-MQAM is clarified, and the mapping relationship between the data information and the specific harmonic components in the output voltage is established.
Secondly, based on the implementation process of OFDM-MQAM in the existing communication field, the type of data carrier, the design of demodulation link, and other aspects are optimized by combining the actual control characteristics of the converter. The power information integrated method based on OFDM-MQAM is obtained, and the power data dual-carrier modulation process is described in detail. Thus, the purpose of multiple parallel transmissions of multi-decimal data information is achieved, and the communication rate is improved.
Thirdly, the mechanism of voltage ripple caused by communication is clarified by modeling and analyzing the converter state variables before and after the data information switching time, and a solution is proposed. The core of the method is to make the output voltage value at the data information switching time similar or equal to the DC component of the output voltage. The peak value of the output voltage ripple is smaller when no-data carrier is involved than when the data carrier is involved in modulation. Thus, the no-data carrier modulation period can be added before and after the data information switching time to optimize the voltage ripple. The no-data carrier modulation period is called the symbol combination zero-padding period, and the OFDM-MQAM modulation method with the symbol combination zero-padding link is obtained to optimize the voltage ripple caused by the communication.
Finally, a 5 V/10 V interleaved parallel Boost converter operating in continuous conduction mode (CCM) is used for verification. The results show that when the converter transmits data information at 25 kbit/s with reliable power conversion and transmission, the optimized voltage ripple peak value is reduced by 51.2%, which improves the power information integrated capability of the converter.
In conclusion, the effect of MQAM can be achieved by the data modulation of the control signal. Combined with the data modulation of multiple carriers, the power information integration of OFDM-MQAM is realized so that the converter can handle parallel transmissions of multi-decimal data information to improve the communication rate. The mathematical model of the converter power information integrated transmission shows that switching the transmitted data information will cause a voltage ripple with large peak-to-peak values, which adversely affects the output voltage. To suppress the undesirable effect, the symbol combination zero-padding link is added to the power data modulation. By designing the demodulation link, the effect of inter-channel interference (ICI) and inter-symbol interference (ISI) can be eliminated. The technical approach proposed in this paper can be used as a reference to enhance the power information integration of power electronic converters.

Key words： Power information integration orthogonal frequency division multiplexing (OFDM) multiple quadrature amplitude modulation (MQAM) voltage ripple optimization

Received: 08 June 2022

PACS:	TM46
	TN91

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	Guo Hao
	Li Yan
	Hou Bingbing
	Jing Yongteng

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Guo Hao,Li Yan,Hou Bingbing等. Power Information Integration Technology of DC-DC Converters Based on Orthogonal Frequency Division Multiplexing-Multiple Quadrature Amplitude Modulation[J]. Transactions of China Electrotechnical Society, 2023, 38(16): 4353-4365.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.221066 OR https://dgjsxb.ces-transaction.com/EN/Y2023/V38/I16/4353

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