대역폭 확산 변조 기법을 활용해 통신 기능과 EMI 저감 성능을 갖는 Dual Active Bridge Converter

Abstract

Recently, with the expansion of AC distribution systems and the development of DC Microgrids, communication via power lines is required to check the status of the demand sides and the condition of transmission lines. In distribution systems, the conventional method using power lines requires separate signal conversion devices and does not achieve significant effectiveness due to the influence of the power lines. Therefore, talkative power conversions (TPC) which use the power converter‘s output voltage ripple and the PWM carrier’s variations to transmit the communication signal have been researched. However, huse EMI filters are usually required since there are EMI issues in high-speed switching converters. It can lead to challenges in communication accuracy, therefore, reducing EMI is essential to obtain high power density and ensure accurate communication. This paper employs a spread spectrum modulation (SSM) to mitigate the EMI of the Dual Active Bridge (DAB) converter and to embed communication data into the output voltage ripples. To demodulate transmitted data, the design parameters of the SSM are investigated for the controller design. The experimental results verify the successful transmission of the communication data through a 1-kW DAB converter prototype.