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In whole system, the user usually only offers a voltage with noise as input logic voltage to digital receiver, to guarantee the right logic control, it requires that the IC chip must have a stable inversion level with logic high and logic low input voltage. For COMS process, in traditional design scheme, it usually uses a normal digital inverter as input-unit schematic, and changes the width or length...
Impedance source inverters have attracted much attention in recent years due to their ability to behave as voltage elevators/reducers at their output terminals without the need of an extra dc/dc converter to accomplish this task. Among these inverters, the quasi-impedance source inverter (qZSI) is one of the most known topologies. It considers two basic operating states, the no-shoot-through state...
An original overvoltage mitigation technique is presented in this paper for Sic based motor drives, exploiting an open-end winding motor configuration. According to the proposed solution over-voltage occurring at the terminals of the motor phases is mitigated by driving the two inverters through a modified switching pattern including a suitable dwell time. No passive RLC networks are required, thus...
This paper presents a high performance 12 kW motor drive system for an aerospace application. In order to achieve higher power density and reliability, the system uses a PMSM motor, SiC MOSFET inverter, high performance PWM control, and liquid cooling with phase change material. A power density of 33 KW/KG was achieved for the power inverter and control electronics excluding the cooling loop, and...
Mobile power substations (MPSs) are optimally designed to be installed on a truck bed for ease of transportation in order to provide an interface between two medium-voltage distribution systems under emergency or maintenance conditions. Based on the solid-state transformer (SST), a topology of N-series modules concept is proposed for MPS. The average control methods are used to balance the voltage...
In photovoltaic (PV) systems, module level power electronics has focused a lot of attention in the last years. The microinverter, also known as AC module, has shown to be an interesting solution. For this purpose, PV microinverter architectures with pseudo DC-link consisting in a DC-DC converter followed by an unfolding inverter have been analyzed as good alternatives. This paper proposes a new push-pull...
In this paper, design considerations for transitioning from a Si-IGBT based inverter to a SiC-MOSFET based inverter are discussed. An existing Si-IGBT power structure is modified using a footprint compatible SiC-MOSFET module, with changes made to the power structure and gate drive for the high PWM switching frequency required for SiC devices. Design issues such as inductance minimization, EMC mitigation...
This paper reports on the design and experimental verification of a 200 kVA traction inverter using three 900 V, 2.5 mΩ, SiC MOSFET-based half-bridge power modules comprising the power stage. Each dual power module contains four 900 V, 10 mΩ SiC MOSFETs per switch position and uses synchronous conduction to achieve high average and peak efficiencies over its entire operating region to meet the demands...
In this paper, key aspects of silicon-carbide (SiC)-based automotive traction drives are reviewed. Firstly, the required supporting factors to achieve optimal operating conditions and best performance are described. Major component sizing methodologies and constraints are included. Expectations on gate threshold voltage, trans-conductance, and transient oscillation are discussed. Tolerance against...
A switching circuit system based on FPGA is designed and implemented in this paper to provide high-frequency adjustable-phase voltages for the ultrasonic motor. For the existing drive systems of the ultrasonic motor, the bus voltage is usually 12V DC or 24V DC supporting by an external adapter, the driving voltages of the ultrasonic motor, however, are required to be boosted yet. Then, the step-up...
The implementation of 15 kV Silicon Carbide (SiC) MOSFETs in a three-phase, three-level active power filter of 100 kVA for a 10 kVAC grid and their challenges is shown. Due to the high switching frequency of 16 kHz, respectively 32 kHz ripple frequency, it will perfectly suited for active filtering of harmonics in the medium voltage grid.
MOSFET devices have a body diode that allows reverse conduction, additionally, when a negative drain-source voltage is present, the MOSFET channel conduction can also be controlled by applying a gate-source voltage above the threshold voltage level. In a three phase inverter this results in parallel conduction of the diode and MOSFET when voltage and current differ in sign. This paper analyzes the...
Silicon carbide semiconductors offer high switching frequencies for high voltage application which reduces the filter size. The main drawback of high current applications are high turn-on losses. Within this paper an inverter is proposed which uses a quasi-resonant triangular current mode where the MOSFETs are turned on at zero current.
Logic gates for ultra-low voltages suffer from speed and robustness degradations, which are highly associated with the process technology. In this work a methodology for the automated design-space exploration of standard logic gates for a 28 nm FD-SOI technology is shown. Comprehensive design space explorations of inverter and nand2 gates show the benefits of back-biasing at sub-threshold supply voltages...
We present EMI simulations of a silicon carbide MOSFET traction inverter. The simulations are based on a transient circuit simulation and frequency domain simulations of different 3D geometry models. In a first step, an equivalent circuit is derived from parts of the geometry model and combined with an analytical model of the MOSFETs and an equivalent circuit model of the DC link capacitor. The results...
Silicon carbide (SiC) devices are attracting attention as next generation power device because of their high breakdown voltage, low conduction loss, and fast switching speed compared with conventional Silicon (Si) device. SiC power device is expected to be used in electric vehicle and hybrid electric vehicle. The large di/dt and dv/dt in fast switching operation interact with parasitic component in...
This paper presents a concept for a compact high voltage generator based on a highly integrated power chain switching at frequencies above 500 kHz. The high frequency operation in combination with the high integration approach enable a reduction of volume and weight of HY-generators used in industrial or medical applications.
The efficiency of the electric powertrain has a direct influence on the cost and range of electric vehicles, which are the two key factors hindering the public acceptance of electric vehicles (EVs). Inverters, as an important component of the electric powertrain, have a high efficiency at full load, but an unsatisfying performance at partial load due to the bipolar characteristics of IGBT. To improve...
In near future, modern aircrafts will be more electrical, having more power converters in different applications. Inverters is one of the most common applications, which are used in actuators, cabin pressurization, among others. In order to significantly reduce weight, size and losses of these converters, disruptive technology such as Wide Bandgap components (SiC and GaN transistors) should be used...
Outstanding efficiencies can be achieved by the utilization of the latest technology of low voltage, SMD-packaged Si- or GaN-based semiconductors. These devices allow a heatsink- and fan-less converter design, thus lightweight and high power density converters are typically derived. This paper investigates the advantages of using these relatively low cost SMD-packaged devices in medium power industrial...
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