Low-Voltage-Stress AC-Linked Charge Equalizing System for Series-Connected VRLA Battery Strings

Charnyut Karnjanapiboon; Kamon Jirasereeamornkul; Veerapol Monyakul

Low-Voltage-Stress AC-Linked Charge Equalizing System for Series-Connected VRLA Battery Strings

Charnyut Karnjanapiboon

Kamon Jirasereeamornkul

Veerapol Monyakul

Vol. 13, No. 2, pp. 186-196, Mar. 2013

10.6113/JPE.2013.13.2.186

Battery Management System

Charge equalization system

Synchronous forward converter

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Abstract

This paper presents a low voltage-stress AC-linked charge equalizing system for balancing the energy in a serially connected, valve-regulated lead acid battery string using a modular converter that consists of multiple transformers coupled together. Each converter was coupled through an AC- linked bus to increase the overall energy transfer efficiency of the system and to eliminate the problem of the unbalanced charging of batteries. Previous solutions are based on centralized and modularized topologies. A centralized topology requires a redesign of the hardware and related components. It also faces a high voltage stress when the number of batteries is expanded. Modularized solutions use low-voltage-stress, double-stage, DC-linked topologies which leads to poor energy transfer efficiency. The proposed solution uses a low-voltage stress, AC-linked, modularized topology that makes adding more batteries easier. It also has a better energy transfer efficiency. To ensure that the charge equalization system operates smoothly and safely charges batteries, a small intelligent microcontroller was used in the control section. The efficiency of this charge equalization system is 85%, which is 21% better than other low-voltage-stress DC-linked charging techniques. The validity of this approach was confirmed by experimental results.

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Cite this article

[IEEE Style]

C. Karnjanapiboon, K. Jirasereeamornkul, V. Monyakul, "Low-Voltage-Stress AC-Linked Charge Equalizing System for Series-Connected VRLA Battery Strings," Journal of Power Electronics, vol. 13, no. 2, pp. 186-196, 2013. DOI: 10.6113/JPE.2013.13.2.186.

[ACM Style]

Charnyut Karnjanapiboon, Kamon Jirasereeamornkul, and Veerapol Monyakul. 2013. Low-Voltage-Stress AC-Linked Charge Equalizing System for Series-Connected VRLA Battery Strings. Journal of Power Electronics, 13, 2, (2013), 186-196. DOI: 10.6113/JPE.2013.13.2.186.