Abstract
In this paper, a novel voltage equalizer is developed for series battery strings based on the two-phase switched capacitor technique. Different from the conventional voltage equalizers which are developed by switched-mode power converters, bulky magnetic components and complex monitoring and control system are avoided in the proposed system. Just a pair of complementary pulse signals with constant switching frequency and fixed duty ratio are required to control all of switches employed in the proposed voltage equalizer, and charge transfers from the higher voltage battery cells to lower voltage ones automatically. The circuit configuration and operation principle are provided in this paper. The model of the proposed voltage equalizer is also derived. Comparison with other works indicates that the proposed method is superior to the conventional switched-capacitor (SC) voltage equalizer for the high stack of series battery strings. Experimental results demonstrate that the proposed voltage equalization system is capable of excellent voltage balancing performance with a simple control method.
Highlights
Series-connected batteries or electric double-layer capacitors (EDLCs) are widely used in handheld and portable consumer products, electric vehicles, as well as renewable energy applications such as photovoltaic and wind power generation systems
From the viewpoint of the attributes of components used for voltage equalization, voltage equalizers could be grouped into three types
A novel voltage balancing system for series battery/EDLC strings is developed based on a two-phase SC technique in this paper
Summary
Series-connected batteries or electric double-layer capacitors (EDLCs) are widely used in handheld and portable consumer products, electric vehicles, as well as renewable energy applications such as photovoltaic and wind power generation systems. Of diodes cause a large amount of power losses and makein the efficiency difficult to improve This novel method does not fundamentally problem that charge cannotare be Switched-capacitor (SC) voltage equalizers, as the solve third the voltage balancing technology, transferredbyfrom theSC highest voltage cell to the lowestcharge one directly. Developed using converters to directly transfer from the higher voltage battery/EDLC this paper, novel design concept of SC voltageareequalization system is presented to cells toInthe lower ones.a The main advantages of this technique that the bulky magnetic components overcome the problem existed in the conventional structure The balancing limited, makes voltage equalizer compared to the conventional one is that charge can be transferred from any one this structure difficult to apply in those series strings with larger numbers of cells. It means the voltage balancing speed could be significantly higher than
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