The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this paper, an inductive power transfer (IPT) charger for electric vehicles (EVs) is proposed to improve the entire system efficiency and power density by eliminating the dc-dc converter in the secondary side. In the proposed IPT charger, the dc-link voltage is adjusted according to the coupling coefficient with the help of cascade buck-boost converter in the front-end side and the bridgeless rectifier...
This paper proposes a three-switch step-down DC/DC converter with fault-tolerant capabilities. Detection of faults during power converter switching operations is important to avoid failures. In this paper, fault analysis is based on open circuit fault detection (OCFD) techniques. A numerical solution is developed based on the joule-integral principle to design OCFD hardware protection. Under normal...
In the previous studies, it has been shown that the steady-state operation of a class-E resonant inverter can be rapidly simulated in the frequency domain by extending the concept and mathematical form of electrical impedance. This paper provides a more comprehensive solution for the efficient simulation of practical class-E resonant inverter, which is driven by a MOSFET switch. The parasitic components,...
This paper presents a new technique to detect the junction temperature of Silicon Carbide (SiC) MOSFET devices. The process of detection is based on injecting a high frequency/low amplitude sweep signal into the gate lead of a SiC device during its OFF-state period. A frequency response analysis is carried out to determine the variation in the impedance which is a function of temperature change. The...
The demand for high-efficiency power converters is increasing continuously. The switching losses are typically significant in power converters. During the switching time, the component is exposed to a considerable voltage and current causing power loss. The switching time is limited by parasitic inductance produced by traces and interconnections inside and outside the package of a device. Moreover,...
Silicon carbide (SiC) devices attract widespread attention of scholars because of their superior characteristics. However, the interaction between the upper and lower devices during the switching process in the bridge circuit will affect the safe operation of SiC devices. To suppress the crosstalk spurious voltage, this paper proposes a gate driver circuit based on magnetic coupling for SiC devices...
This paper proposes a novel highly reliable single-stage buck-boost inverter. It can be operated as grid-connected and stand-alone inverter. In a single-stage, it can generate an output ac voltage higher and lower than the input dc voltage. The proposed inverter can be employed in grid-connected single-phase PV systems without injecting large dc current into the grid. In addition, it has no shoot-through...
The traditional Phase-Shift Full-Bridge Converter (PSFBC) cannot achieve Zero-Voltage Switching (ZVS) at light loads due to small resonant current resulting in low conversion efficiency at light loads. Therefore, a light-load conversion efficiency improvement strategy for PSFBC is emerging and needs to be realized. A novel dead-time adjustment strategy for light-load conversion efficiency improvement...
This paper proposes a power-circulating operation at light load operation for a parallelly-connected dual-active-bridge (DAB) converter in order to achieve zero voltage switching (ZVS) over entire load range and wide battery-voltage variation. At the light load, a power flow of each DAB converter is controlled in such a way that the transferred power of each DAB converter satisfies the condition for...
This paper presents an optimized design of 12kW 2L-FB inverter for small-scale wind turbine, taking into account some specific behavioral features of SiC power MOSFETs. Power converters used in renewable energy conversion have to deal with intermittent and variable power availability from the source, which implies that they actually work at their maximum rated power for only a small fraction of their...
This paper aims to comprehensively investigate the efficiency, power density and overall cost of input series output parallel (ISOP) medium voltage (MV) all silicon carbide (SiC) DC-DC converter in solid state transformers (SST). The medium voltage capability can be achieved by using either high voltage devices or multiple low voltage cells in series. Voltage rating of semiconductor devices, magnetic...
In this paper, a current sensorless maximum power point tracking (MPPT) algorithm for a low-cost PV array controller is proposed. In order to reduce the cost on controllers and sensors, the PV array controller is based on controlling turn-on time of the interleaved flyback converter and DC bus output is designed. The controller only samples the input voltage without the need for a current sensor,...
We developed a gate driver IC that can power IGBTs of up to 500 amperes for HEVs and EVs. A newly developed Zener clamping circuit effectively suppressed the IGBT spike voltage in short circuit (SC) mode. The silicon-on-insulator (SOI) process was utilized to achieve high temperature operation and high surge protection.
In this study, we demonstrated an isolated-type flyback converter circuit for high-frequency operations. We estimated the high-frequency characteristics of passive devices in various conditions of a DC-DC converter circuit. We experimentally developed the isolated-type flyback converter circuit and evaluated the frequency response properties. In order to verify the fast-switching operation, the input...
This paper presents present a study and implementation of a three-level boost converter. This converter feature includes low devices voltages stress requirement for high voltage application, small inductor size that leads to the reduction of cost and size and can be operated with a wide range input voltage. Unlike conventional method, output capacitor voltage balancing was done by a slight phase shift...
This paper presents the assembly and characterization of an integrated all silicon-carbide (SiC) 3-to-1 phases matrix converter, intended for harsh environment withstand capability and highly reliable operation (e.g., renewable energies, solid-state transformation, smart grids, electric transport). Commercial SiC MOSFETs in bare-die form are used to develop custom-packaged bi-directional switches,...
This paper presents a ZVT(zero-voltage-transition) interleaved synchronous buck converter with passive soft-switching cell to achieve ZVS(zero-voltage-switching) of MOSFET switches. The proposed interleaved buck converter is composed of two synchronous buck converter modules and passive soft-switching cell. The passive soft-switching cell consists of coupled-inductor and DC-link capacitor. All switches...
A compact 2-terminal, series-pass active damping circuit utilizing semiconductor device is proposed. It is implemented with linearly-operated device such as MOSFET using current feedback control at very low dropout voltage. The damping device features a simple internal structure and is connected in series with a generic switching mode power supply (SMPS). It can damp unwanted oscillation due to the...
Silicon Carbide (SiC) Metal-Oxide-Semiconductor Field-Effect Transistors (MOSFETs) have the potential to increase the power density in power electronics converters compared to the currently used silicon (Si). Their benefits are higher efficiency, higher switching speeds, and higher operating temperatures. Moreover, SiC MOSFETs, which are normally-off, offer the possibility to directly replace Si Isolated-Gate-Bipolar-Transistors...
The conventional structure of buck-boost inverter uses IGBTs. IGBTs have features like long tail current, fixed voltage drop and that is why its switching losses are high. In this paper switching cells structured buck-boost inverter is proposed. In switching cell structure, MOSFETs and external diodes with very fast reverse recovery characteristics are used, while the body diodes have no chance of...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.