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We demonstrate a 900V SiC MOSFET with a record-low ON resistance of 10 mΩ in a TO-247 package. Due to their record low specific ON resistance, and a low Rds,On temperature coefficient, 900V SiC MOSFETs can far exceed the current densities of IGBTs in discrete packages. SiC MOSFETs also have a robust, low reverse recovery body diode which makes them suited to hard-switched and soft-switched topologies...
The recent advances and reports on failure precursors of power switches have led to estimation of lifetime as well as developing secondary control schemes to increase the lifetime of the converters. In this study, a secondary control scheme to extend the lifetime of the converter based on the identified failure precursors such as the on-state resistance variation for power MOSFETs and collector emitter...
A quasi-Z-source modular cascaded converter (qZS-MCC) is proposed for high-voltage (HV) dc integration of photovoltaic (PV) power. The qZS-MCC comprises front-end isolated qZS half-bridge (HB) dc-dc converter submodules (SMs) in series. By the qZS-HB handling PV voltage and power variations, a unified duty cycle is applicable for the front-end isolation converter of all SMs. Resultantly, the proposed...
In plug-in electric vehicles (PEVs), an isolated dc/dc converter with high step-down ratio is required to supply power to the onboard appliances. The wide battery pack voltage range on the input side brings significant challenges to the design and optimization of this dc/dc converter. This study comprehensively compares LLC resonant topology, series-resonant topology with delay-time control (DTC-SRC),...
This paper presents a practical physics-based switching time (turn-on and turn-off time) model of MOSFET in synchronous buck converters. The turn-on and turn-off time of the MOSFET switching element has a strong impact of the operating efficiency of the converter. The proposed model can be implemented in predictive, practical efficiency model of DC/DC converters, like WEBENCH® Power Designer. Unlike...
The voltage source driver is widely used in a conventional drive circuit of PFC converter, where the fixed parameters of drive circuit couldn't optimize the switching loss of power switches. In view of this problem, one adaptive turn-off method of power switch for PFC converter is proposed, in which the turn-off current could be regulated adaptively with the input voltage changed periodically. The...
This paper clarifies the relationship between the current ripple and the power density in bidirectional DC-DC converters. In the conventional power density design method, in order to obtain the pareto-front curve of the power density and the efficiency, the current ripple is designed as constant value, whereas the switching frequency is varied. As a result, the possibilities of higher power density...
This paper presents a soft-switched discontinuous pulse-width pulse-density modulation (PWPDM) scheme to decrease the switching losses of the capacitor-less high-frequency pulsating dc-link (HFPDCL) inverters. The proposed modulation scheme employs both pulse-width modulation (PWM) and pulse-density modulation (PDM) schemes to increase the overall efficiency of the inverter and generate high-quality...
With the commercial introduction of wide bandgap power devices such as Silicon Carbide (SiC) and Gallium Nitride (GaN) in the last few years, the high power and high frequency power electronics applications have gained more attention. The fast switching speed and high temperature features of SiC MOSFET break the limit of the traditional silicon MOSFET. However, the EMI problem under high dI/dt and...
Insulated gate bipolar transistors (IGBTs) are usually connected in series to satisfy the requirements of high-power and high-voltage in power electronics applications. However, due to the parameter deviations of the series-connected IGBTs, it is difficult to ensure an equal voltage sharing between them during both transient and steady-state operations. This paper proposed a novel active gate drive...
This paper presents a comparative evaluation of the loss and thermal performance of two advanced three-level inverter topologies, namely the SiC based T-Type and the Hybrid-NPC, both of which are aimed at reducing the high switching losses associated with a conventional Si based T-Type inverter. The first solution directly replaces the 1200V primary Si IGBT switches with lower loss 1200V SiC MOSFETs...
In this paper a highly flexible 2-phase step-down dc-dc converter topology designed for a wide range of point-of-load (PoL) applications is introduced. The new wide-input flying-capacitor based multi-level converter has smaller overall volume and better power processing efficiency than the conventionally used 2-phase interleaved buck solution, achieved through the reduction of voltage swings across...
This paper proposes a discontinuous pulse width modulation (DPWM) method for an indirect matrix converter (IMC) driving induction motor (IM) in order to reduce switching losses. The IMC has advantages that long lifetime and reduced volume depending on the lack of capacitors. However, the IMC has many electric switching devices because it is composed of two stages such as a rectifier stage and an inverter...
This paper is to present a comparison of the electrical losses that occur in the five-phase and three-phase permanent magnet assisted synchronous reluctance motors (PMa-SynRM). Minimizing the losses has been the best practice to get maximum efficiency from high performance motor drive systems. This paper investigated four types of electrical losses which are common in a motor drive. Comparative loss...
The reactive power in power converter with inductive load (motor drive e.g.) requires a current commutation path for the freewheeling current. Due to the high voltage drop of body diode of SiC MOSFET, a SiC Schottky diode is normally recommended as the anti-parallel freewheeling diode for SiC MOSFET to suppress the conduction of body diode. However, since the MOSFET can work as synchronous rectifier,...
High conversion efficiency is always desired in energy storage device (ESD). In this work a high efficiency GaN and Si device mixed isolated bidirectional dc-dc converter is proposed in the distributed ESD application. To optimize the efficiency of the bidirectional half-bridge push-pull active clamp converter over a wide input/output voltage and load range, it is necessary to accurately predict the...
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