Abstract
By considering the impact of parasitic resistance of inductors and capacitors employed in buck-boost and switched-capacitor types of cell balancing systems, a double-tiered cell equalizer is developed in this work. The first tier of this system is derived from buck-boost cell equalizer and the second tier is implemented by a switched-capacitor equalizer which has fast equalizing speed. The two tiers share a common switch array controlled by one pair of complementary square wave signals. The number of switches is therefore reduced significantly and there is no voltage nor current signals needing to be sensed for complex close-loop control. Circuit configuration, modeling and design considerations are illustrated in detail. Both simulation and experimental results are provided to demonstrate the feasibility of the proposed cell balancing system.
Highlights
Energy storage devices are widely used in many industrial applications such as electric vehicles, uninterruptible power supplies and distribution power systems etc
Cell-voltage equalization is an unavoidable issue for battery management systems (BMS) [1], [2]
In the work [30], a new cell balancing system combining buck-boost and Cuk converters is developed for series connected battery cells
Summary
Energy storage devices are widely used in many industrial applications such as electric vehicles, uninterruptible power supplies and distribution power systems etc. C2C architecture transfers energy from higher voltage cells to lower voltage cells so that all cells’ voltages are converged to an average value It can be achieved by buck-boost converter [5], [6] and its derivative structure [7], [8], Cuk converter [9], LC resonant converter [10], novel transformer technique [11]–[15], or switched-capacitor (SC) conversion circuits [16]–[21]. In the work [30], a new cell balancing system combining buck-boost and Cuk converters is developed for series connected battery cells. The concept of buck-boost and SC combination is further developed by considering the impact of parasitic resistance of capacitors and inductors In this case, the first and second issues found in the system of Fig. 1(a) are addressed simultaneously. Because the voltage of a battery cell is usually lower than 5V, low voltage rated transistors can be used to improve equalizing performance and reliability of the double-tiered balancer
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
