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Title: Electrified Automotive Powertrain Architecture Using Composite DC–DC Converters

In a hybrid or electric vehicle powertrain, a boost dc-dc converter enables reduction of the size of the electric machine and optimization of the battery system. Design of the powertrain boost converter is challenging because the converter must be rated at high peak power, while efficiency at medium-to-light load is critical for the vehicle system performance. By addressing only some of the loss mechanisms, previously proposed efficiency improvement approaches offer limited improvements in size, cost, and efficiency tradeoffs. This article shows how all dominant loss mechanisms in automotive powertrain applications can be mitigated using a new boost composite converter approach. In the composite dc-dc architecture, the loss mechanisms associated with indirect power conversion are addressed explicitly, resulting in fundamental efficiency improvements over wide ranges of operating conditions. Several composite converter topologies are presented and compared to state-of-the-art boost converter technologies. It is found that the selected boost composite converter results in a decrease in the total loss by a factor of 2-4 for typical drive cycles. Furthermore, the total system capacitor power rating and energy rating are substantially reduced, which implies potentials for significant reductions in system size and cost.
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  1. Univ. of Colorado, Boulder, CO (United States). Dept. of of Electrical, Computer and Energy Engineering
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
IEEE Transactions on Power Electronics
Additional Journal Information:
Journal Volume: 32; Journal Issue: 1; Journal ID: ISSN 0885-8993
Research Org:
Univ. of Colorado, Boulder, CO (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Country of Publication:
United States
42 ENGINEERING; 25 ENERGY STORAGE; 33 ADVANCED PROPULSION SYSTEMS; Power electronics; boost converter; composite converter; dc–dc converter; electric vehicle powertrain; electrified transportation; mechanical power transmission; vehicles; insulated gate bipolar transistors; batteries; power generation; capacitors
OSTI Identifier: