Survey of 99.9% Class Efficiency <scp>DC‐AC</scp> Power Conversion and Technical Issues

Kawamura, Atsuo; Miguchi, Yasuhiko; Setiadi, Hadi; Obara, Hidemine

doi:10.1002/tee.23728

Cited by 6 publications

(5 citation statements)

References 28 publications

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“…The major applications are electric drives and related energy storage of vehicles [40,41]. The partial boost topology was extended in [19,42,43], and an efficiency of over 99.8% was achieved using a 1.3 kW DC-AC conversion system.…”

Section: Recent Studies On Extremely High-efficiency Dc-dc Conversionmentioning

confidence: 99%

Over 99.7% Efficiency at 100kW DC-DC Power Conversion using a 3.3kV SiC Device and Discussion on Device <i>dv/dt</i> Estimation

Kawamura,

Tsuruta,

Obara

2024

IEEJ Journal IA

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This paper is a re-evaluation of a completed project (High Efficiency Demonstration Grant Using High Voltage SiC Device) from the perspective of accurate efficiency measurement; additionally, this paper discusses on device dv/dt estimation. A topology called the high-efficiency energy conversion system (HEECS), which is one variety of partial boost circuit topologies, is introduced to achieve efficiency over 99.5%. The topology exhibits a very high efficiency for applications in which the output voltage variation is within a certain ratio of the rated output voltage. This paper summarizes the basic features of the topology and theoretically derives the principle of high-efficiency realization. The high efficiency is measured by the back-to-back(BTB) connection of two converters, and the efficiency and accuracy on this method are theoretically derived and confirmed using the measured data of 3.3 kV output voltage at 100 kW output. The theoretical estimation of dv/dt for a 3.3 kV SiC device to reduce dual-active-bridge(DAB) soft-switching loss is discussed. Furthermore, a trend of DC-DC conversion efficiency is shown, and we show that the partial boost topology is a promising approach for achieving high efficiency dc-dc conversion.

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Section: Recent Studies On Extremely High-efficiency Dc-dc Conversionmentioning

confidence: 99%

Over 99.7% Efficiency at 100kW DC-DC Power Conversion using a 3.3kV SiC Device and Discussion on Device <i>dv/dt</i> Estimation

Kawamura,

Tsuruta,

Obara

2024

IEEJ Journal IA

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“…Electric vehicle motor operates at a voltage between 360 V and 480 V, although recent models elevate the working voltage to 800 V [58][59][60][61]. Power sources should match operating voltage to avoid energy losses in the voltage conversion process; indeed, the higher the voltage conversion rate, the higher the energy losses [62][63][64].…”

Section: Hybrid System Characteristics A) Photovoltaic Panelmentioning

confidence: 99%

Hybrid Power Source Assisted by Renewable Energies for Hybrid Electric Vehicles

Armenta-Déu

2024

Preprint

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The article studies and analyzes a hybrid power source system, lithium battery, and fuel cell assisted by flexible photovoltaic panels for hybrid electric vehicles (HEVs). The new configuration operates based on optimizing the performance of the dual power source to maximize the available energy and operating time. The operational mode simulates specific driving conditions in urban, peripheral, and intercity routes under variable driving patterns and traffic conditions. The simulation results show that the new configuration increases the hybrid electric vehicle performance, providing higher reliability despite the more complex design. The proposed system reduces the external power supply dependence and avoids unexpected sudden stops due to energy exhaustion. The new configuration also extends the vehicle driving range depending on driving mode and route conditions. The vehicle driving range extension may reach up to 276.3 km. The hybridization of fuel cells with lithium battery and PV panel assistance enhances battery management, reducing battery servicing and increasing lifespan. The proposed topology is cheaper than a single fuel cell power system by 17.2%, reducing the total cost related to the single battery power system if we consider the battery recharge for its entire lifespan. The cost saving is 2.6% for the American market and 14.8% for the European one.

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“…On the other hand, high efficiencies with half-bridges are often presented either in power-factor-correction (PFC) circuits, or for relaxed input-tooutput voltage conversion ratios. In [34] ultra-high efficiency converters are discussed and efficiencies beyond 99.8% are reported in the best-case, namely if the output voltage is close to the input voltage. For reduced output voltages (half or below half of the input voltage) the reported efficiency in [34] dropped below 99.7% for a ratio of 0.5.…”

Section: B Approachmentioning

confidence: 99%

“…In [34] ultra-high efficiency converters are discussed and efficiencies beyond 99.8% are reported in the best-case, namely if the output voltage is close to the input voltage. For reduced output voltages (half or below half of the input voltage) the reported efficiency in [34] dropped below 99.7% for a ratio of 0.5. The peak efficiency of 99.8% in [32] is reported at an output to input voltage ratio of 0.75, and dropped below 99.7% for ratios below 0.67.…”

Section: B Approachmentioning

confidence: 99%

A 99.74% Efficient Capacitor-Charging Converter Using Partial Power Processing for Electrocalorics

Moench

Reiner

Mansour

et al. 2023

IEEE J. Emerg. Sel. Topics Power Electron.

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This work combines a 99.2% efficient GaN-based low-voltage fast-switching half-bridge converter with a Si-based high-voltage slow-switching and almost lossless switched capacitor multiplexer using a partial power processing approach to a six-level prototype with 99.74% efficiency. A loss breakdown shows how the ideal partial power processing efficiency is theoretically increased to 99.84% by using four additional voltage levels, but then reduced to the measured efficiency by the additional static and dynamic losses of the multiplexer. For electrocaloric heat pumps, an emerging technology for cooling and heating applications with zero global warming potential, such high charging efficiencies enable a high heat pump system coefficient of performance (COP). Based on available data of electrocaloric lead magnesium niobate (PMN)-based samples, and based on a first-principle and best-case analysis for Carnotlike cycles, it is predicted that the 99.74% electrical charging efficiency in combination with the electrocaloric material data enables to surpass 50% of the thermal Carnot limit (for cooling with a heat pump). Ultra-high efficiency of power converters thus pave the way towards future electrocaloric heat pumps of competitive system performance.

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Survey of 99.9% Class Efficiency DC‐AC Power Conversion and Technical Issues

Cited by 6 publications

References 28 publications

Over 99.7% Efficiency at 100kW DC-DC Power Conversion using a 3.3kV SiC Device and Discussion on Device <i>dv/dt</i> Estimation

Over 99.7% Efficiency at 100kW DC-DC Power Conversion using a 3.3kV SiC Device and Discussion on Device <i>dv/dt</i> Estimation

Hybrid Power Source Assisted by Renewable Energies for Hybrid Electric Vehicles

A 99.74% Efficient Capacitor-Charging Converter Using Partial Power Processing for Electrocalorics

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