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Open AccessTechnical Note

EV Range Extender in a Two-Battery HEECS Chopper-Based Powertrain

Division of Electrical and Computer Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya, Yokohama, Kanagawa 240-8501, Japan
Author to whom correspondence should be addressed.
World Electr. Veh. J. 2019, 10(2), 19;
Received: 27 February 2019 / Revised: 28 March 2019 / Accepted: 4 April 2019 / Published: 19 April 2019
(This article belongs to the Special Issue Power Electronics Subsystems)
This paper first presents a new powertrain based on a two-battery High-Efficiency Energy Conversion System (HEECS) chopper that is suitable for electric vehicles (EVs). The HEECS chopper is based on the principle of a partial power conversion circuit, and the overall efficiency is over 99% in a wide load range. The efficiency of this powertrain was measured in the steady state by two types of powertrains, a non-chopper powertrain and an HEECS chopper-based powertrain, using a motor test bench. On the basis of these data, several driving tests, such as the Worldwide-harmonized Light vehicles Test Cycle (WLTC), were simulated, and four driving cycle patterns were included. A 6.4% reduction in energy consumption was observed in WLTC low mode compared with the energy consumed by the non-chopper powertrain in the experiments. Thus, the HEECS chopper-based powertrain is more suitable for low-speed driving ranges than high-speed ranges. View Full-Text
Keywords: electric vehicles; HEECS chopper; powertrain; range extension electric vehicles; HEECS chopper; powertrain; range extension
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Tamura, A.; Ishibashi, T.; Kawamura, A. EV Range Extender in a Two-Battery HEECS Chopper-Based Powertrain. World Electr. Veh. J. 2019, 10, 19.

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