Multi‑loop voltage control strategy of half‑bridge voltage balancers with current sensorless scheme

Jaeeun Moon; Taeyeong Lee; Sanghun Han; Younghoon Cho

Multi‑loop voltage control strategy of half‑bridge voltage balancers with current sensorless scheme

Vol. 20, No. 4, pp. 1015-1024, Jul. 2020

10.1007/s43236-020-00098-4

Abstract

This paper proposes a multi-loop voltage balancing strategy for half-bridge voltage balancers. The proposed multi-loop scheme consists of a voltage controller and a current variation controller without current sensors. The proposed current variation controller (CVC) aims to regulate the derivative of the average inductor current to be zero at the steady-states as well as to increase the damping of the entire control loop. Furthermore, the CVC is implemented based on a current sensorless scheme. For this purpose, a simple method for detecting current variation by using dc-link voltages and a control model is also proposed. To secure the stability of the proposed CVC with the current sensorless method, a well-known type II regulator is adopted, and its design procedure is detailed. The proposed multi-loop strategy is applied to a 2.4-kW half-bridge voltage balancer. Both simulation and experimental results show good agreements with the theoretical analyses.

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Cite this article

[IEEE Style]

J. Moon, T. Lee, S. Han, Y. Cho, "Multi‑loop voltage control strategy of half‑bridge voltage balancers with current sensorless scheme," Journal of Power Electronics, vol. 20, no. 4, pp. 1015-1024, 2020. DOI: 10.1007/s43236-020-00098-4.

[ACM Style]

Jaeeun Moon, Taeyeong Lee, Sanghun Han, and Younghoon Cho. 2020. Multi‑loop voltage control strategy of half‑bridge voltage balancers with current sensorless scheme. Journal of Power Electronics, 20, 4, (2020), 1015-1024. DOI: 10.1007/s43236-020-00098-4.