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This paper derives the small-signal model and designs the controller for a high boost ratio dc-dc converter with the application for PV modules. A voltage controller with proportional-integral (PI) cascaded quasi-resonant (QR) controllers is presented for an inner PV voltage loop of maximum power point tracking (MPPT) control. Here, PI controller provides fast-tracking of voltage reference and maintains...
A breadth of advanced manufacturing technologies utilize plasma based material processing. A central system to plasma processing schemes is the RF power delivery and associated components. In a conventional RF power delivery system, the RF power supply performs power regulation for a desired power leveling quantity, and an impedance tuning network operates autonomously to match the dynamic and nonlinear...
Gallium Nitride (GaN) HEMTs have increasingly been used in high frequency switching power converters. The combination of high voltage, high current, high temperature and low-on resistance enables higher efficiency and lower form factor as compared to Silicon devices. FET switch operate in the linear ohmic region. However, the presence of trap centres in GaN HEMTs alter the on-resistance and shifts...
In this paper an improvement technique for the current distortion of the three-phase switched reluctance motor (SRM) drive system is proposed. The proposed control method is based on the concept of superimposing the DC current into the current control loop of the cascaded double three-phase full bridge based converter. The tested machine is a 1.5 kW, 3-phase, 6-stator-pole and 4-rotor-pole SRM. The...
A pre-energized auxiliary circuit can be constructed to buffer fast load transients using advance information from an intelligent load. Such information should include the exact times of load transients and their magnitudes. This paper proposes a compact auxiliary circuit that generates a current half the magnitude of the transient. The proposed circuit builds on earlier work addressing load-informed...
Multi-Chip Power Modules (MCPMs) allow for integration of high power semiconductor devices and control circuitry into one compact package which yields improved reliability and reduced size, cost, and complexity. The layout design process of an MCPM is time consuming and very multidisciplinary, spanning thermal, electrical, and mechanical issues. A software tool is introduced in this paper which allows...
This work investigates the contactless power delivery system with an air gap of 0 to 3cm between the primary and secondary coils for mobile device charging applications. The proposed power electronic energy conversion system is built based on electromagnetic resonant coupling principle. Through the resonant coupling, the system is able to deliver a large percentage of energy to the secondary side...
This paper proposes a novel current measurement method for Maximum Power Point Tracking (MPPT) control of thermoelectric power generation. This paper presents the possibility to use the MOS-FET as the current measuring resistance, instead of conventional measuring methods, such as the DC-CT or the shunt resistance. Former is high cost and latter causes energy loss. The reduction of components is also...
This paper studies the dynamic voltage stability of a typical aircraft power system - variable frequency generation system loaded with PWM rectifier as a constant power load. The L-CCR filter is used for reducing input current harmonics of the rectifier. It establishes the small-signal model of the system. The parameters dominating the system stability were studied based on the eigenvalues of the...
A compact Super-Junction MOSFET model is reported. The model describes all device performances based on the potential distribution calculated by solving the Poisson equation and the current continuity between channel and resistive drift region. The main focus is given on describing the resistance effect in the drift region, where the current flow is first parallel to the surface and then changes into...
Multiphase dc-dc converters are widely used in power electronics. In the case of generating multiple output voltages from a common input voltage, converters have to operate at non-uniform duty cycles. This is challenging in regard to input current ripple minimization, as control techniques for interleaved operation of asymmetric converters are not well understood. In this paper, analytic formulas...
In the paper, a set of improvements of the semiempirical MOSFET model is suggested to ensure required accuracy for simulating power electronic circuits. The enhancement of the precision was arranged by incorporating the more accurate Grove-Frohman equations into the semiempirical model because the contemporary short-channel-oriented models BSIM and EKV are inappropriate for characterizing the power...
In this paper, we present a new power MOSFET model and an easy to use characterization tool which extracts model parameters from data available in device datasheets. The model has a good balance between accuracy and ease of parameter extraction, and covers both static and dynamic characterization. The extraction flow is streamlined with a user friendly interface. The simulation results from the extracted...
This paper introduces a generalized derivation and equation that represents the behavior of the basic dc-dc topologies (namely buck, boost, and buck-boost converters) in a normalized geometrical domain. The establishment of a unified theory is an important step towards understanding the natural trajectories and physical limits of power converters. A comprehensive insight into geometrical characteristics...
We have developed a compact model for the injection-enhanced insulated-gate bipolar transistor, which simulates switching performance accurately. The main development is to model the floating-base region, where charge accumulation occurs and influences strongly on the switching characteristics. It is demonstrated that the observed negative gate capacitance is well reproduced by considering the charge...
Mathematical modeling of power electronic converters is a historical problem. Numerous efforts have been documented in literature to model different converter topologies and their control schemes since the 1940s. Traditional modeling approaches avoid transfer function derivation due to high degree of nonlinearity involved with the power converter's switched operation. In this paper, a simple transfer...
A physics based compact model for SiC Junction Barrier Schottky (JBS) diodes is presented which features a comprehensive physical description of the DC and CV behavior of SiC JBS diodes. For the first time, modeling of leakage current for JBS diode in circuit simulation is done. The model includes temperature scaling of its parameters to enable modeling of the diodes over a wide range of temperature...
Instabilities due to mutual interactions among converters and inverters are sometimes observed. A system with multiple converters can be controlled stably overall when each converter is controlled according to each energy-based function like the Lyapunov function. This paper proposes a new Lyapunov-based digital control method. First its principle is derived especially for a digital control. Then...
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