E. I. Jury

Bio: E. I. Jury is an academic researcher from University of California, Berkeley. The author has contributed to research in topics: Oscillation & Pulse-width modulation. The author has an hindex of 1, co-authored 1 publications receiving 18 citations.

On the stability of pulse-width-modulated feedback systems

Abstract: The objective of this paper is to present a frequency-domain stability criterion for pulse-width-modulated feedback systems. The criterion states that 1) if the Nyquist locus of the pulse transfer function of the linear plant does not intersect or encircle a certain disk in the complex plane, then the system is l 2 bounded input-bounded output stable, and 2) if the impulse response of the linear plant is zero at t = 0 , then the radius of the disk approaches zero as the ratio of the linear-plant bandwidth to the pulse-width-modulator frequency approaches zero. It is shown that the result in 2) implies that the criterion in 1) essentially becomes the well-known Nyquist criterion for sample-data systems when the pulse-width-modulator frequency is sufficiently large. This result permits the use of the standard design techniques for linear sample-data systems in a wide class of pulse-width-modulated systems. Consequently the design of these systems can be greatly simplified.

Analysis of a Class of Pulse Modulated DC-to-DC Power Converters

Abstract: The basic operational characteristics of dc-to-dc converters are analyzed. The basic physical characteristics of power converters are identified. A simple class dc-to-dc power converters is chosen which could satisfy any set of operating requirements. Three different controlling methods in this class are described in detail. Necessary conditions for the stability of these converters are measured through analog computer simulation. These curves are related to other operational characteristics, such as ripple and regulation. Finally, further research is suggested for the solution of the physical design of absolutely stable, reliable, and, efficient power converters of this class.

Stability of pulse-width-modulated feedback systems†

Abstract: Sufficient conditions for the asymptotic stability in the sense of Lagrange or ultimate bonncloclness of pulse-width-modulated control systems are developed in this paper using the Second Method of Liapunov. This method is not limited to higher-order systems and is applicable to plants having transfer functions with real or complex poles. The conditions have been obtained by constraining the first difference of the quadratic form of a Liapunov function to be negative definite by expanding it in a Taylor series.

Stability of a class of discrete control systems containing a nonlinear gain element

Abstract: The problem considered in this paper is to find an explicit stability gain sector for a class of autonomous discrete control systems containing a nonlinear gain element. A quadratic form Lyapunov function is assumed and the Aizerman technique [1] is used to find such a stability sector. A method to select the quadratic Lyapunov function to maximize the width of the sector is suggested.