基于联合功率量/载波调制的DC-DC变换器功率/数据复合传输方法

A Method of Power/Data Multiplexing Transmission in DC-DC Converters Based on Joint Power/Carrier Modulation

DC-DC变换器可以同时进行功率变换和数据传输。针对较低通信速率限制功率/数据复合传输(power/data multiplexing transmission,PDMT)应用的难题,提出一种联合功率量/载波调制(joint power/carrier modulation,JPCM)的新方案。与传统二进制PDMT方案不同,JPCM同时对功率量/载波进行2FSK调制,实现两种数据并行传输,可以看作一种四进制FSK,有效提高通信速率。相较于传统四进制PDMT方案,JPCM方案解调环节所需带通滤波器数目可减少一半,且软件开销更低。首先,证明PDMT在理论上的可行性;然后,根据4种不同电压纹波频率配置不同码元,并设计了包含高低数据位调制的JPCM和基于滑动傅里叶变换的数据解调方案;此外,重点分析输出参考电压突变对通信的影响,动态调整阈值可有效抑制误码;最后,搭建一个由2个Buck变换器并联的实验装置,实验结果表明在稳态、负载突变和输出参考电压突变的工况下,JPCM方案均能实现20 kb/s的通信速率,验证了该方案的有效性。

DC-DC converters can simultaneously perform power conversion and data transmission.To address the challenge of lower communication rates limiting the application of power/data multiplexing transmission(PDMT),this paper proposes a novel scheme of joint power/carrier modulation(JPCM).Differing from traditional binary PDMT approaches,JPCM concurrently applies 2FSK modulation to both power and carrier,enabling parallel transmission of two data streams.This can be regarded as a quaternary FSK,effectively enhancing communication rates.In comparison to traditional quaternary PDMT schemes,the JPCM approach requires half the number of bandpass filters in the demodulation stage,resulting in reduced software overhead.First,the feasibility of PDMT is theoretically demonstrated.Subsequently,it configures different symbols by four distinct voltage ripple frequencies,and designs the schemes of JPCM encompassing high and low data bit modulation and data demodulation based on sliding discrete Fourier transform.Furthermore,the impact of output reference voltage transients on communication is critically analyzed,and dynamically adjusting the thresholds proves effective in suppressing symbol errors.Finally,an experimental setup consisting of two parallel Buck converters is established.Experimental results demonstrate that a communication rate of 20 kb/s can be achieved under steady-state,load transient,and output reference voltage transient conditions by PDMT,verifying the effectiveness of this scheme.