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This paper proposes a Zero-Voltage Ride-Through (ZVRT) method and an LCL filter optimization design method to meet the Fault Ride Through (FRT) requirements for a singlephase grid-tied inverter with a minimized LCL filter. The inverter output current overshoots at a voltage sag when the small LCL filter is used. As a proposed method in this paper, the inverter output current overshoot is suppressed...
This paper presents a multilevel modular step-down DC-DC switched-capacitor converter that utilizes soft switching resonant operation. Previous versions of traditional multilevel modular switched-capacitor dc-dc converters (MMSCC) have a low switching device voltage rating. Moreover, capacitor voltage stress increases proportionally as the voltage conversion ratio increments. Significant advantage...
Based on the dynamic behavior of IGBT and diode, this paper proposed an experimental method for extracting stray inductance of bus bars without high bandwidth current measurement. The experiment is implemented by a double pulse test of the 4.5kV/3000A HVIGBTs. The stray inductance extraction results of several methods were analyzed and compared, verifying the accuracy of the proposed method.
SiC-MOSFETs have attracting increasing attention because of their outstanding characteristics that contributes to high efficiency and high power density of power converters. However, compared to conventional Si-IGBTs, SiC-MOSFETs are susceptible to false triggering, because they tend to generate large switching noise due to ultrafast switching capability and have a lower threshold voltage in high...
This paper proposes a compensation method for precise position-sensorless control using high-frequency pulsating voltage injection and the criterion for applicability of the proposed compensation method is discussed. Theoretical background of the proposed 3-dimensional compensation table as well as the implementation method is described and it is disclosed that the real rotor position and the convergent...
This paper presents the modeling of variable inductors (VI) following an analytical procedure. Usually, in a VI a dc magnetic flux is injected into the structure in order to provide a bias level that allows for magnetic permeability modulation. The ac magnetic flux is superposed to this dc level, thus making it possible that a variable inductance can be seen from the ac windings. Under the assumption...
1700V SiC modules were built with next-generation SiC MOSFETs, with 25°C RDSON per MOSFET cut approximately 50% from existing commercial SiC MOSFETs. Additionally, the external SiC anti-parallel diode was eliminated in favor of using the SiC MOSFET body diode during the dead time. The resulting 1700V SiC module used only 32% of the SiC chip area, yet reduced the 25°C module RDSON from 8mΩ to 5mΩ,...
The subject of this paper is to propose a new design method of EMI filters that allows to minimize the volume of the common-mode inductor with consideration of core saturation issues. One of the main results of this study shows the impact of the switching frequency on the filter insertion loss and the volume of the coupled common-mode inductor depending on the length of the shielded cable. Then, the...
This paper analyzes the convergence of the rotor position tracking in signal-injection sensorless control especially for heavily saturated IPMSMs. In the analysis, it is revealed that the harmonic inductance and the operating current variation are critical factors determining the operation limit of signal-injection sensorless control. Considering this, the feasibility region of signal-injection sensorless...
This paper presents a robust deadbeat predictive power control (DBPC) for PWM rectifiers with consideration of parameter mismatches. To achieve accurate power control with crude estimations of the grid-side impedance, the system disturbance caused by inaccurate parameter is analyzed. Then, a complex power based sliding-mode disturbance observer (SMDO) is proposed. Both DBPC and SMDO are implemented...
One of the primary requirements of dual active bridge (DAB) dc-dc converters is to operate under zero voltage switching (ZVS), to reduce switching losses and increase operating efficiency. However, three-phase DAB converters are known to have limited capability to operate in ZVS, particularly at low power levels, because of their inherent two-level six-step phase shifted square wave modulation strategy...
Model predictive control (MPC) has become a hot research topic in applications. The combination of continuous control set MPC (CCS-MPC) and pulse width modulation (PWM) can achieve high-performance while overcoming the drawback of the uncertain switching frequency of finite control set MPC (FCS-MPC). Based on the Field-oriented control (FOC), this paper proposes the CCS-MPC current control method...
This paper proposes a transformer based self-starting boost converter for thermoelectric energy harvesting, which operates even when polarity inversion of thermoelectric generator (TEG) occurs. TEG is used to convert thermal energy into electrical energy. Due to the Seebeck effect, an open circuit voltage of the TEG is proportional to the number of thermocouples in series and to the temperature difference...
This paper presents a 1200 V, 120 A SiC phase-leg power module built in a novel low inductive 3D hybrid structure. The power module consists of DBC substrate and Flexible Printed Circuit (FPC) board equipped with SiC MOSFETs and diodes. The parasitic inductance of the power module is significantly minimized by using the FPC board and the proper layout design to 0.79 nH (extracted by Q3D). The power...
This paper presents an analytical model of air gapped inductor considering the nonlinear magnetic behavior of the core along with temperature variation. First, a nonlinear magnetic behavior is represented by a mathematical function, which contains three coefficients and defines magnetic flux density (B) as a function of magnetic field strength (H). Using Matlab curve fitting toolbox, these coefficients...
This paper proposes the phase-controlled class-D inverter with resonant-capacitor voltage clamp. By adding the clamp circuits to resonant capacitances connected in parallel, it is possible to protect the inverter from the inrush and over currents automatically. By regenerating the clamp current to the input voltage source, high power-conversion efficiency can be achieved. Additionally, the design...
Equivalent circuit parameters are very important for permanent magnet synchronous machines since they serve as the basis for performance estimation and implementation of power electronic drives controls. Specified in the newly approved IEEE Std 1812, a short-circuit test can be employed, in combination with an open-circuit measurement, in order to determine the back emf and the synchronous inductance...
This paper introduces a novel tunable inductor whose inductance can be adjusted continuously in a large range. The new inductor has one winding wrapped on a magnetic flux valve (MFV) and two C-cores attached to each side of the MFV to form a closed magnetic circuit. Its inductance can be altered continuously by applying an external control voltage on the MFV. This paper presents the concept, configuration,...
The power flow capability of high frequency phase-shifted dc-dc converter depends on transformer leakage inductance and switching frequency. The design of multi-port transformer requires optimized volume and losses with required leakage inductance for rated power flow. Use of fast-switching SiC devices also demand low inter-winding parasitic capacitance for reduced common mode current. The work in...
This paper presents a single-stage soft-switching high-frequency link isolated converter for bidirectional motor drive applications. The ‘minimal’ topology is based on the recently proposed soft-switching solid-state transformer (S4T) with a single current-source power conversion stage. This single stage approach reduces total switch rating, provides sinusoidal input and output voltages, and uses...
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