基于罗氏线圈的高频双有源桥变换器电流模式控制及实现

doi:10.19595/j.cnki.1000-6753.tces.240386

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Abstract The current mode control effectively achieves high dynamic response for dual active bridge (DAB) converters. However, for high-frequency and high-power-density applications, the existing control methods still face some limitations. On the one hand, the bandwidth of the commonly used current sensors, e.g., Hall-effect sensors, is not high enough to capture the complete information of the high-frequency inductor current. On the other hand, the existing implementation methods rely on analog comparators and digital triggers, which involve more discrete components and complex control logic than the traditional phase shift control. This paper proposes an analog-digital hybrid current mode control for high-frequency (hundreds of kHz) DAB converters. A high bandwidth (30 kHz~3 MHz) Rogowski current sensor is designed to accurately capture the inductor current, while the analog-digital hybrid current mode controller is implemented using a sole microcontroller, reducing system cost, complexity, and PCB layout area.
Firstly, the operating principle of the analog-digital hybrid current mode control for DAB converters is detailed, and the inductor current reference value ±i_ref as a function of transmission power is derived. The theoretical analysis shows that the steady-state performance with the current mode control is equivalent to traditional phase shift control, and the inductor current shows an extremely fast dynamic response. Secondly, the feasibility and advantages of the Rogowski coil for sensing high-frequency inductor current are illustrated. Its operating principle, together with transfer characteristics, is analyzed. A Rogowski coil current sensor is fabricated to capture at least six harmonics of the inductor current of a 200 kHz DAB converter prototype. The bandwidth of the Rogowski coil current sensor is measured as 3.2 MHz using a vector network analyzer, which is sufficient for current mode control. An experimental comparison shows that Rogowski coil current sensors achieve higher accurate measurements of high-frequency inductor current than commercial Hall current sensors (ACS730). In addition, the implementation scheme of the analog-digital hybrid current mode control in a digital controller platform is described. The analog comparison and digital trigger functions are integrated using one microcontroller unit (MCU), which reduces system complexity and cost. Taking TMS320F28379D from Texas Instruments as an example, the implementation flow and register configuration are elaborated.
A DAB converter prototype is designed with 1.4 kW-200 kHz, 150 V input, and 150 V output. The experimental results show that the inductor current of the DAB converter exhibits a swift dynamic response. The dynamic response time of the inductor current for the transient process, such as start-up, power step-up, and power step-down, is less than half of the switching period (2.5 μs). The response time is only 1/64 to 1/32 of the existing research. In addition, the inductor current is firmly restricted to current reference ±i_ref, which can be dynamically adjusted in the digital controller. Therefore, a cycle-by-cycle current limiting capability is simultaneously achieved.
The following conclusions can be drawn. (1) The designed Rogowski coil current sensor can accurately capture the information of high-frequency inductor current, which is a prerequisite for current mode control. (2) The analog comparison and digital trigger functions are successfully integrated into a digital control to reduce system complexity and cost. (3) The DAB converter shows excellent dynamic performance using the proposed analog-digital hybrid current mode control method and implementation strategy.

Key words： Dual active bridge converter current mode control Rogowski coil dynamic response

Received: 08 March 2024

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TM46

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	Zhu Boyang
	Han Weijian
	Chen Jianliang
	Xin Zhen

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Zhu Boyang,Han Weijian,Chen Jianliang等. Current Mode Control and Implementation of High-Frequency Dual Active Bridge Converters Based on Rogowski Coil[J]. Transactions of China Electrotechnical Society, 2025, 40(6): 1888-1899.

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