A new partitioning approach integrates the power devices and drive of a high-efficiency synchronous-rectified buck converter for numerous advantages in low-voltage power systems. This approach, coupled with a low-cost voltage-mode controller, improves efficiency by eliminating the dissipative current-sensing resistor and reduces size with a smaller inductor. The resulting converter responds fas...

This paper presents a development of a self-tuning fuzzy PID controller to overcome the appearance of nonlinearities and uncertainties in the system. The self-tuning fuzzy PID controller is the combination of a classical PID and fuzzy controller. The controller is designed based on the expert knowledge of the system. Fuzzy logic is used to tune each parameter of PID controller. Appropriate fuzz...

Single-Stage transformerless AC/DC converter received much attention in the universal line application. Unlike the existing converters a new high step-down transformerless single-stage single-switch AC/DC converter is proposed. The topology integrates a buck-buck-boost converter with low intermediate bus and output voltage. The converter utilizes a buck converter as a PFC cell and buck-boost co...

To raise the utilization ratio of lithium-ion battery in portable devices, a novel green-switch controller IC is proposed to constitute a 4-switch cascade buck–boost prototype, which is capable of outputting non-inverting step down and step up voltages. According to the relations between the input and output voltages through duty ratio, a finite state machine automatically determines the work m...

The objective of this paper is to construct a wind generator system (WGS) loss model that addresses the loss of the wind turbine and the generator. It aims to optimize the maximum effective output power and turbine speed. Given that the wind generator system has inertia and is nonlinear, the dynamic model of the wind generator system takes the advantage of the duty of the Buck converter and emp...

This study presents a novel Switched Reluctance Motor (SRM) drive system with power factor improvement. Recently, many of the converters with variable speed drives have no input power factor correction circuits. This results in harmonic pollution of the utility supply, which should be avoided. The effect of power factor variation in terms of harmonic content is also analyzed in this study. The ...

Abstract The paper introduces a subclass of nonlinear differential-algebraic models interest for applications. By restricting the nonlinearities to multilinear polynomials, it is possible use modern tensor methods. This opens door new approximation and complexity reduction methods large scale systems with relevant behavior. modeling procedures including composition, decomposition, normalization...

In this work, a zero static error proportional controller for a two-cell DC-DC buck converter is synthesized and analyzed. Under a traditional proportional control scheme, the system presents a constant error of the current supplying the output load. As the proportional feedback gain is increased, the average static error decreases. However, sub-harmonic oscillations and chaotic behavior emerge...

A new resonant switch is introduced which employs nonlinear tank elements. Zero current switching is obtained. yet the peak transistor voltage and current stresses can approach those of an equivalent ideal PWM converter. Reduced switching loss without a substantial increase in conductbn loss is therefore possible. An approximate analysis is outlined, and transistorpeak voltage and current stres...