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This paper presents the results of the development and use of a full bridge GaN high electron mobility transistor (HEMT) converter used in an inductive power transfer (IPT) application. Experimental results using a Si MOSFETs converter in an IPT setup has previously been reported. By using GaN HEMTs instead of Si MOSFETs, the converter efficiency can be increased over a broad range of operating points...
Adopting the In-Wheel Motor technology (IWM) for the traction system of electric vehicles (EVs) leads to several advantages. Since the motors can drive each wheel in the vehicle independently, the EV can take full advantages of technologies such as anti-slip control of tires for enhanced safety and performance, and optimal torque distribution for extension of the vehicle mileage. However, a major...
This paper presents a single-phase Virtual Synchronous Machine (VSM) and its possible application for providing Vehicle-to-Grid (V2G) services from domestic battery chargers of Electric Vehicles (EVs). In a VSM, the power converter is controlled to emulate the inertia and the damping effect of a synchronous machine. Thus, a VSM-based EV charger can contribute to the spinning reserve and frequency...
This paper proposes a combined design and control method for high power inductive battery charger applications where the coupling conditions vary significantly during operation. The method is aimed at minimizing the worst-case Volt-Ampere requirements of the power electronic converters, by utilizing resonant operation with controlled voltage amplitude at low coupling conditions and out-of-resonance...
Droop based control schemes for power electronic converters have been object of extensive research in the last decade and have arguably become the most popular solution for converter control in microgrid applications. The protection from over-currents and over-voltages are critical features of control schemes for converters required to operate in both stand-alone and parallel-connected modes, but...
This paper proposes a system and its control method to boost part of the battery voltage for electric vehicle. This system consists of the powertrain of electric vehicles and a bi-directional isolated DC-DC converter called dual active bridge (DAB). The powertrain of electric vehicles in the market has the problem that its performance degrades due to fluctuations in battery voltage. In order to solve...
This paper proposes driving range extension by series chopper power train for Electric Vehicles (EV for abbreviation). The proposed method was experimentally verified and compared with the previous publication [1]. Further measurement on motor test bench, to compare this drive with the conventional power train, showed a 2.1 % improvement.
The series chopper type power train for EV is proposed for aiming the increase of one battery charge driving range. A motor-test bench and also actual car were constructed, and the proposed power train with SAZZ (Snubber Assisted Zero voltage and Zero current Transition) chopper was experimentally compared between with and without the chopper.
This paper discusses four quadrant SAZZ-1 chopper (Snubber Assisted Zero Voltage and Zero Current Switching) and its direct application to a EV (Electric Vehicle) power train. The performance of SAZZ-1 chopper is demonstrated on several prototypes. The first prototype is a 25 kW, 50 kHz SAZZ-1 with efficiency in the range between 96 % and 97 %. This was further improved by a redesigned SAZZ-1 chopper...
The paper proposes an optimized modulation scheme for the Dual Active Bridge (DAB) converter topology, ensuring complete Zero Voltage Switching (ZVS) over the whole operating range. At first, ZVS limits for the modulation scheme in use are evaluated, taking the effect of resonant commutations into account. A strategy to achieve ZVS over the whole operating area is then proposed. A simple procedure...
Multilevel converters and specially multilevel four-leg four-wire converters actually are an important focus of researchers. Applications as harmonic compensation and energy quality are the major objectives of this type of converters. The balancing of the DC-Link capacitors voltage is a critical problem in multilevel converters and the first control strategy based on using the redundant vectors in...
When a synchronous buck converter is operated with zero voltage switching (ZVS) and fixed frequency, the direction of the current in the output inductor is alternated each switching period. Thus the output current ripple of the converter is high to ensure zero voltage switching operation at maximum load. With interleaved outputs this leads to high circulating currents at low loads. In this paper,...
When a synchronous buck converter is operated with zero voltage switching (ZVS) and fixed frequency, the direction of the current in the output inductor is alternated each switching period. Thus the output current ripple of the converter is high to ensure zero voltage switching operation at maximum load. With interleaved outputs this leads to high circulating currents at low loads. In this paper,...
Multilevel converters and specially multilevel four-leg four-wire converters actually are an important focus of researchers. Applications as harmonic compensation and energy quality are the major objectives of this type of converters. The balancing of the DC-Link capacitors voltage is a critical problem in multilevel converters and the first control strategy based on using the redundant vectors in...
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