Abstract
Combining electric vehicle battery charging and battery cell equalisation in one circuit
Highlights
Transportation electrification is an inevitable trend due to the increased global drive towards the adoption of low carbon vehicles to reduce the greenhouse effect
Most current hybrid electric vehicles (HEVs) and electric vehicles (EVs) are powered by lithium‐ion battery packs, which have a high‐ power density and longer cycle lives compared with other battery technologies [3,4,5]
This paper proposes an integrated single stage battery charger/charge equalisation circuit for HEVs/EVs
Summary
Transportation electrification is an inevitable trend due to the increased global drive towards the adoption of low carbon vehicles to reduce the greenhouse effect. In [22], a bi‐directional battery charger is proposed with a modular integrated equalisation circuit in which the battery cells are connected to the grid via a full‐bridge rectifier, a DC/DC converter and a group of switches. The two MOSFETs in one bi‐ directional switch are controlled by a common signal, which can simplify the gate drive circuit This circuit requires the number of cells in a target string to be odd which is to ensure that, when several consecutive cells are charging or discharging together, the top and bottom nodes of the string are connected to Bus_A and Bus_B separately. The equivalent circuit showing the current flow path for charging B2 as an example is shown in Figure 2 (c) During this period, SC1 and SC2 MOSFETs in the cell selector are conducting.
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