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This paper gives a detailed analysis about the causes of the voltage distortion caused by dead time in dual active bridge (DAB) DC-DC converter. The zero-crossing point of the equivalent leakage inductor's current is the definitive factor for various voltage distortion phenomena, which is determined by dead time and phase-shift ratios. Based on the switching characterization of DAB in dual-phase-shift...
A pack-to-cell-to-pack battery equalizer with soft-switching based on buck-boost converter and bidirectional LC resonant converter is proposed to achieve a fast and high-efficiency battery equalization. The buck-boost converter is employed to transmit energy from a high tension supply to a low one in the buck mode or from a low one to a high one in the boost mode with zero-voltage switching (ZVS)...
The equalization speed and efficiency are the key issues of battery equalization. In order to improve the equalization performance, this paper proposes an any-cell(s)-to-any-cell(s) equalizer based on bidirectional inductor converters. With inductor converter legs connected to each lithium-ion cell polarities, this topology can transfer energy from any cell(s) to any cell(s), which results in an enhancement...
This paper presents the concept of using a switched coupled-inductor cell for implementing quasi-Z-source inverters. By replacing one of original inductors found in the classical impedance network by a coupled-inductor, and adding one diode, new single-stage buck-boost inverter with a small count of elements and a high conversion ratio are obtained. The output voltage of the new inverter can be adjusted...
This paper presents a new resonant soft-switching quasi-Z-source inverter. On the basis of the quasi-Z-source inverter, the proposed inverter inherits the features of high voltage boost ability, circuit simplicity and high reliability. A resonant network with coupled inductor is employed to achieve the soft-switching scheme. All active devices (switches and diodes) in the inverter are tuned on and...
This paper presents a generic reactance source power converter (abbreviated as X-source converter), which is a generic topology for buck-boost single-stage converter, employs a unique reactance circuit (consists of at least one pair of LC filter) to couple the converter main circuit to the power stage, thus providing unique features that cannot be obtained in the V-source converter and C-source converter...
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