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In this paper, we discuss the interleaved Flyback Micro-inverter with SiC device. The Micro-inverter is composed of front-end interleaved Flyback converter and a 50Hz switching MOSFET inverter. A loss model is used to compare the efficiency between using SiC devices and conventional device. Three solutions are compared: Micro-inverter with Si diode, Micro-inverter with SiC diode, and Micro-inverter...
In this paper, a high voltage SiC MOSFET module with series-parallel hybrid topology is presented and analyzed. The module consists of two uniform parts in parallel and each of the part includes three sub-parts in series. The sub-part contains three primary parts connected in string where each of these parts has a parallel of two SiC MOSFETs. These SiC MOSFETs are divided into six sub-modules, which...
In renewable energy applications power conversion efficiency is major concern. This is especially true for grid-tie energy storage systems based on bidirectional dc-dc and dc-ac converters where power flows through these system components. Latest developments in power semiconductors technology significantly reduced switching and conduction losses in dc-dc and dc-ac converters allowing efficiencies...
The paper presents a gate driver for current-control power semiconductor devices such as BJT. The gate driver has a capability to reduce switching time duration of a power transistor, both in turn-on and turn-off transients. Besides, when the transistor is in static conduction periods, the driver gives a high driving current to the power transistor with holding up by a low supply voltage. This leads...
This paper analyzes the influence of package parasitic inductance of fast switching MOSFET in the transient operation. It is found that in the traditional common source MOSFET packages, the inductor in the source connection pin limits the switching speed and reduces the system stability by the gate oscillation. Therefore a package using separated connection for gate control of fast switching MOSFET...
Continuing to raise the bar for power conversion performance, eGaN FETs are steadily improving performance in high power density and high current applications. In this paper we will discuss the latest developments in DC-DC converters, including a major improvement in eGaN FETs with the latest generation devices. This new family of eGaN FETs is keeping Moore's Law alive with significant gains in key...
IPT technology has been increasingly used in EV charging systems. However, fast charging using IPT technology is still a concern due to high-power high-frequency operation. This paper presents a low cost modified MOSFET-IGBT multi-level converter that is suitable for high power and high frequency IPT systems. The proposed converter with a reduced number of switches can be employed on both sides of...
This paper presents a power density/efficiency evaluation in single phase power factor correction (PFC) applications operating in continuous conduction mode (CCM). The comparison is based on semiconductor dynamic characterization and a mathematical model for prediction of the conducted electromagnetic interference (EMI). The dynamic characterization is based on a low inductive double pulse tester...
This paper presents a research of full digital-controlled AC/DC converter, which consists of single Boost PFC and LLC resonant DC/DC converter. The whole control system structure is proposed to integrate all analog control functions. By digital control, it can reduce the system's volume and costs, improve characteristics. As a proof of this design, an example of 240W AC/DC converter is given. The...
An active snubber cell and its dual circuit for reducing switching losses of 1 to N phase dc-dc converters is presented. Main switch(s) of the converter can be turned-on and - off at zero-voltage (ZV); auxiliary switch of the proposed snubber cell can be turned-on at zero-current (ZC) and turned-off at ZV. There are no extra current and voltage stresses will be introduced on the main switch and the...
A parallel-serial dual active bridge (PSDAB) circuit is presented in the paper to improve the efficiency under the circumstances of high-voltage ratio transformation. The proposed PSDAB circuit is constructed by the paralleled low-voltage terminals of the two dual active bridges (DABs) and the serial high-voltage terminals of the DABs. Just like the DAB circuit, the zero voltage switching (ZVS) is...
A switching mode power supply will easily cause serious electro-magnetic interference (EMI) because of the high frequency operation of the power devices. The traditional passive EMI filter (PEF) is bulky and also not efficient in low frequency range. A differential mode active EMI filter (AEF) for DC/DC converter is proposed in this paper. With the analysis and modeling of the full bridge DC/DC converter,...
Silicon carbide (SiC) semiconductor devices have received extensive attention with the better performance of the wide band gap material. It is necessary to compare with their silicon (Si) counterparts due to SiC semiconductor devices are new. In this paper, a test platform based on buck converter is constructed to test the switching characteristics of SiC MOSFET, Si CoolMOS and IGBT, the input voltage...
Characteristics of fast recovery diode (FRED) type super junction MOSFET (SJ-MOS) are reported. The reverse recovery ruggedness (-di/dt ruggedness) of the SJ-MOS FRED is dramatically improved compared to that of non-FRED type, which is almost 16 times better.
This study presents a novel topology named high voltage-gain boost DC-DC converter with tapped-inductor. The proposed topology provides a high voltage-gain and low input current ripple which are suitable for alternative power sources such as PV and fuel-cell applications. The interleaved control mode can be used to reduce input and output filtering. Moreover, the voltage stress on MOSFETs are clamped,...
It is of advantage to harvest and dispatch power within a minimal number of conversion steps. This paper proposes a single-stage multi-input multi-output converter (MIMOC), which can be used for interfacing diverse energy sources and loads in future smart homes with dc power distribution architectures. The proposed MIMOC offers compact structure, centralized control, galvanic isolation, and wide voltage...
This paper presents the loss performance analysis of an isolated power supply that is designed for ultra-fast tracking converters. The results of the analysis provide insights into the operation of the proposed power supply, how each physical component contributes to the total loss, and how its efficiency may be further improved.
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