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In this paper, based on the small signal analysis of switching power converters under a hysteretic current mode control, a unified PWM switch model is derived. The model is easy to handle because all manipulations are performed on a circuit diagram which includes simply-described function blocks indicating the physically intuitive relationships among the model parameters. This paper presents two kinds...
Most of the present models of silicon carbide (SiC) Schottky diodes are not suitable for evaluating their performance from a system level. The models presented in this paper are specialized for system-level simulations. They are based on basic semiconductor theories and synthesis of some models in the literature. Theoretical and experimental characterization of SiC Schottky power diodes is also involved...
Closed loop system modeling for the modular masterless multiphase architecture with paralleled voltage and current sharing regulation loops is presented in this paper. The parallel structure allows both loops to have high bandwidth. Modeling results of such systems show that the voltage loop and current loop can be designed independently assuming identical power stages in each phase. The effects of...
This paper presents a distributed control system architecture for power electronics conversion systems. Control partitioning is described and a two-level control hierarchy is proposed. Specifically, a hardware manager-controlling the actual power conversion process-, and an application manager, hardware independent universal controller are introduced and implemented. A detailed description of these...
This paper studies the design of a maximum power point tracker (MPPT) for low power portable solar array applications. The discussion will compare different digital and mixed signal implementation approaches of the same perturb and observe algorithm, in particular: simple P&O algorithm on the duty cycle, P&O algorithm using an analog inner voltage control loop and finally using a digital voltage...
Single-phase PFC boost converters use an input filter capacitor to limit propagation of the switching noise into the AC line. Reactive current drawn by the capacitor from the line is negligible at 60 Hz but increases in magnitude significantly in applications with higher line frequencies (360-800 Hz in future aircraft power systems) such that the total power factor of the converter is no longer unity...
This paper presents a systematic study of harmonic cancellation effects in three-phase voltage-sourced converters (VSCs), both among parallel, interleaved VSC modules and within individual phase of each VSC module. For inter-module harmonic cancellation, we will prove that the effects of interleaving on output current ripple are similar to those in interleaved buck DC-DC converters, and that inter-phase...
In this paper we present a custom IC design and experimental results for a hardware efficient 16 phase digital modulator implemented in a 0.35 mum process. The hardware efficient realization is achieved by time sharing the high resolution portion of the modulator hardware and a simple solution to track phase rotation. The modulator is designed for a duty cycle update rate at 16 times the single phase...
An alternative method to finite element analysis (FEA) for electric machine design and analysis is presented that applies Schwarz-Christoffel (SC) conformal mapping theory using the SC toolbox for MATLABreg that has appeared in the previous literature. In this method, a two-dimensional (2D) developed machine cross-section domain is mapped via SC transformation to a concentric cylinder domain where...
This paper describes design and implementation of a 10 MHz digitally controlled buck converter realized in a standard 0.35um CMOS process. Based on a discrete-time power-stage model, we show that a 3rd-order compensator can be designed for improved transient responses and disturbance rejection compared to standard 2nd-order PID compensators. Efficient hardware realization includes a look-up table...
Trajectory-based controls respond spontaneously to control and system disturbances. Such performance is useful in dynamic applications such as motor drives or converters to meet tracking requirements. This paper evaluates possible trajectory paths a buck or boost converter can take, and the use of geometric surfaces to guide these paths. Numerical procedures are developed to find a converter's system-limited...
The small-signal modeling of single-phase power factor correction (PFC) converters is limited by the fact that it must deal with time varying AC variables; thus becoming a hindrance for controls design and dynamic interaction analysis. This paper proposes a modeling approach for the analysis of multiple single-phase PFC converters, achieved by aggregating them into a single equivalent three-phase...
This paper presents a mathematical model and control design for the sensorless vector control of permanent magnet synchronous machines (PMSM). A detailed motor drive including three-phase PWM voltage-source inverter and PMSM and control system models are presented, providing insight into the frequency response based design of all associated loops, namely back-EMF state observer, rotor speed and position...
This paper analyses different average models of multi-pulse diode rectifiers. In the analysis a full-order and a simplified average model are compared to a detailed switching model. The main goal is to establish the validity of the simplified model. First the different models are discussed. Then the small and large signal evaluations of the models are presented. The input impedance frequency response...
This paper extends the recently introduced approach in constrained optimal control methods for fixed frequency switch-mode DC-DC converters to the parallel interleaved synchronous step-down circuit topology. A simplified modelling scheme is employed allowing for the related optimization problem to be efficiently formulated and solved off-line. Simulation results are provided to illustrate the outcome...
This paper presents a systematic method for modeling small-signal input impedance of line-frequency AC-DC converters. The objective is to develop proper models that can be used for stability analysis of AC power systems with significant DC loads powered by such converters. The proposed modeling method uses harmonic linearization and Fourier analysis techniques to describe the current and voltage mapping...
Polynomial chaos is used to identify the uncertainty associated with the twelve-pulse AC/DC diode rectifier stage of aircraft power systems. The proposed stochastic average model is integrated within the overall power system model by means of nodal analysis and is suitable for the study of transients in the time domain. It is demonstrated that compared with the application of the Monte Carlo method,...
Double-integral Fourier analysis is utilized in this paper to study steady-state and dynamic characteristics of interleaved buck converters. The method presented is general and does not assume commensurability of the perturbation and the switching frequency. The resulting PWM model captures the complete spectrum of the PWM output and predicts the time-varying effect at all frequencies where it may...
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