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This paper presents a novel alternative “safe” test method for line and load regulation specifications of hysteretic controlled switching power converters. These specifications have not been tested in production before because the conventional measurement techniques lead to huge voltage spikes during switching transients. Those voltage spikes are caused by energy accumulation from parasitic inductances...
This paper deals with the propagation of current waves along a randomly positioned transmission line. This line is realized as a chain of equal lumped loads arranged stochastically. The properties of such chains, including damping of current waves due to stochastic interference effects and radiation effects, are investigated.
A simple and tunable waveguide-to-microstrip transition is presented, the transition structure is a dielectric substrate overlaid with metal patches and inserted into the wide wall of the waveguide. A flexible numerical analysis method based on the weak form of the Helmholtz equations is used to optimize and analyze the transition.
A new set of methods for solving the time domain integral equations of electromagnetic theory is introduced. Rather than using a Galerkin space-time discretization, the new approach couples a Galerkin spatial discretization with temporal integrations based on ordinary differential equation techniques. The new temporal discretization method can easily model dispersion, gives rise to high-order convergence,...
This paper uses a method to compute the kernel needed for dispersive scatterer computations numerically. FDDM works by substituting a Z-domain finite difference approximation for the transform variable in the Laplace transformed kernel. The inverse Z-transform of the result is the FDDM kernel. The method described here computes the inverse z-transform directly by integrating in the complex z plane...
This paper presents a systematic approach to solve for the optimal control of a variable-time impulsive system. First, optimality condition for a variable-time impulsive system is derived using the calculus of variations method. Next, a single network adaptive critic technique is proposed to numerically solve for the optimal control and the detailed algorithm is presented. Finally, two examples-one...
This paper presents the research of the air arc simulation for low voltage switching devices. Based on magneto-hydrodynamic (MHD) equations, we developed a time-dependent three-dimensional (3-D) model for the switching arc considering Lorentz forces, Ohmic heating and radiation transport. The arc elongation, arc commutation, arc motion and arc cutting process are all included in the analysis.
A real-time algorithm is developed to modify the ensemble averaging so that it averages nonperiodic signals, such as ECG (electrocardiogram), dz/dt, Delta z, etc., for impedance cardiac profile monitoring. A real-time algorithm is developed top detect R spikes adaptively from ECG signals. A signal preprocessor is developed to process signals digitally before any further work is done. This method reduces...
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