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The voltage regulation for stand-alone three-phase single-stage boost inverter (SSBI) is presented in this paper. In three-phase SSBI, the voltage regulation is achieved by adjusting the boost ratio. The SSBI has been simulated for a wide range of input dc voltages and load levels. Moreover, the performance a 2kW 208/230V laboratory-scale three phase boost inverter is presented for both linear and...
Commercial foundry 0.25µm RF GaN MMICs were characterized as power switches using pulsed IV system. The devices exhibited current collapse and ON resistance modulation. These trap effects were highly dependent on off state quiescent drain bias voltages. At higher switch voltages, the output power was reduced due increase in the ON resistance and collapse of drain current. Traps located on the surface...
Smart Power ICs are Power Switches with integrated control and protection functions for the switching of middle and high current loads in industrial and automotive applications. Due to customer specifications and electromagnetic compatibility requirements it is often desired to limit the current and voltage slew rate at the output terminal of the Smart Power IC by minimizing the switching losses at...
The PWM-controlled Voltage Source Converters (VSCs) are commonly used in industrial and utility applications. In spite of superior features of fast voltage regulation and stable DC-link voltage, PWM-controlled VSCs have the major drawback of being sensitive to the grid disturbances especially the unbalanced conditions and system faults. Unbalanced input voltage generates large negative sequence current...
In radiator thermostat applications, DEAP (Dielectric Electro Active Polymer) actuator tends to be a good candidate to replace the conventional self-actuating or step motor based actuator due to its intrinsic advantages. The capacitive property and high voltage (HV) driving demand of DEAP actuator make a high voltage capacitive load driving system to be necessary. The only energy source battery determines...
Inductive Power Transfer (IPT) is a promising technology for the charging of the traction batteries of electric and hybrid electric vehicles due to the significant simplification of the charging process implied by the contactless transmission of the charging energy. Typically, Finite-Element (FE) methods are used to predict the power loss in the IPT coils, to calculate equivalent circuit parameters,...
This paper presents an inverter-level power loss measurement method for semiconductor switching devices in real inverter operation conditions. This method employs an H-bridge dc-dc convertor topology and a low-loss inductive load to improve the loss measurement accuracy. Since only dc measurement is involved, it is simpler and more accurate compared to traditional inverter-level loss measurement methods...
This paper reports on an investigation of power losses of converters and amorphous core AC-filter inductors for a bipolar 750 V low voltage direct current (LVDC) distribution network, using electrical and calorimetric measurements. The LVDC network is a promising solution, which brings new opportunities to electricity distribution development. High power quality, reliability and high cost efficiency...
In conventional power system operation, droop control methods are used to facilitate load sharing among different generation sources. This method compensates for both active and reactive power imbalances by adjusting the output voltage magnitude and frequency of the generating unit. Both P-ω and Q-V droops have been used in synchronous machines for decades. Similar droop controllers were used in this...
Bearing currents cause a reduction of ball bearing's lifetime in electronically commutated permanent magnet motors. To compensate the lifetime decreasing factors, a tradeoff between special bearings and additional changes in the machine design have to be found. Stator grounding, for example, keeps the bearing voltage low and thus guarantees a long fan system's lifetime, however, results in a higher...
This paper presents a general method to measure the output capacitance (Coss) related energy loss per switching cycle in power MOSFETs used in zero-voltage-switched (ZVS) applications. It is shown that a simple model using Coss in series with a resistance Ross is inadequate for describing the observed energy loss and a different model is needed. This work also shows that the traditional hard-switched...
The reasons of measured grid voltage signals including dc components in the grid-tied applications could be the original input signal with dc component, the zero drift of detecting elements and converters, or the grid system fault. When the measured grid voltage has the undesired dc component, the low frequency oscillation would appear in the traditional phase locked loop (PLL) and in consequence...
This paper presents a single-input dual-output (SIDO) converter with the simple structure which easily implements zero-voltage-switching (ZVS). In the power transmission mode, a case may appear that one output port of this SIDO converter is idling while another output port is working normally. In this paper, the bad effect of dead-time on achieving the idling output port is detailed analyzed, simulated...
This paper introduces a detailed nonlinearity characterization technique for insulated-gate bipolar transistor inverters in a drive system which is able to measure device nonlinearities. Methods are derived from measurements of the voltage on the inverter phases. These measurements are obtained while applying a set of direct currents to an electrical machine. These methods are then applied to tests...
Double pulse tester (DPT) is a widely accepted method to evaluate the switching behavior of power devices. Considering the high switching-speed capability of wide band-gap (WBG) devices, the test results become significantly sensitive to the alignment of voltage and current (V-I) measurement. Also, because of the shoot-through current induced by Cdv/dt, during the switching transient of one device,...
This paper presents filter-capacitor current compensation for Division-Summation (D-Σ) digital controlled singlephase bi-directional inverter with LCL filter to reduce grid-current distortion. The single-phase bi-directional inverter allows wide filter-inductance variation and it can operate in grid-connection mode and rectification mode with power factor correction. With the D-Σ digital control,...
In this paper, a new post-fault modulation strategy is proposed to operate the direct matrix converter (MC) as close as possible to its desired normal operating under an open-switch fault condition. The proposed strategy determines the switching states of the eight, out of the nine, remaining healthy switches of the converter, to generate the reference voltage. The corresponding duty cycles of the...
Three-phase single-stage boost inverter requires narrow pulses, thus a low resolution DSP can cause some pulse droppings which results in asymmetries in the output waveforms of the boost inverter. This leads to an increase in the total harmonic distortion (THD) of the output waveforms. In order to solve this problem, a modified version of the phasor pulse width modulation (PPWM) switching pattern...
In this paper, a computational method that uses only the input voltage and current to identify the impedances of multiple loads in wireless power transfer systems without any direct load measurements is proposed. The method has been practically realized in a wireless power domino-resonator system comprising 8 resonators. A good degree of accuracy has been achieved in the practical verification. Although...
A controller for single phase DC/AC converters is proposed that is analogous with the droop control method used in synchronous generator technology. Its approach is different from the existing droop techniques adopted for power electronic inverters where consistently the output voltage is controlled through an explicit voltage control loop. The proposed method indirectly controls the output voltage...
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