SMPS Applications Research Articles

Erratum to “Design of Gray Wolf Optimizer Algorithm-Based Fractional Order PI Controller for Power Factor Correction in SMPS Applications”

Erratum to “Design of Gray Wolf Optimizer Algorithm-Based Fractional Order PI Controller for Power Factor Correction in SMPS Applications”

Design of a Novel Isolated Single Switch AC/DC Integrated Converter for SMPS Applications

Design of a Novel Isolated Single Switch AC/DC Integrated Converter for SMPS Applications

Design of Gray Wolf Optimizer Algorithm-Based Fractional Order PI Controller for Power Factor Correction in SMPS Applications

This paper proposes the design of gray wolf optimizer (GWO) algorithm-based fractional order proportional integral (FOPI) controller for power factor correction (PFC) using interleaved dc–dc single ended primary inductance converter converter with improved performance characteristics such as speed, accuracy, and stability. The detailed analysis and modeling of the proposed converter are presented. The optimal parameters of FOPI controller are obtained using GWO algorithm to improve the speed of response of the system. FOPI controller provides better performance in terms of robustness and stability since it has one more adjustable parameter than the conventional proportional integral (PI) controller. The cascade control strategy is implemented for the proposed converter with GWO-based FOPI controller as inner current and outer voltage controllers for PFC and load voltage regulation. The performance characteristics of the proposed system are analyzed and compared with conventional and other optimization techniques using MATLAB/Simulink software. A prototype of the proposed converter controlled by TMS320C2000 microcontroller for an output power of 200 W is tested and validated with the simulation results. The proposed system is used for powering devices like robots in critical applications such as military, space craft, etc., where stability, speed, and accuracy are major concerns.

AVX High Temperature Products for Surface Mount and SMPS Applications

Abstract AVX produces a myriad of surface mount ceramic products, as well as stacked SMPS capacitors. AVX no offers many high temperature solutions for applications involving temperature requirements above what basic X7R and C0G can offer. This paper will discuss the advantages of base metal electrode devices, as well as AVX's methods of producing high temperature Nickel NP0 and VHT dielectric ceramics. This paper will also discuss high temperature SMPS capacitors, including custom solutions for MWD and LWD applications as well as AVX's SMX style products.

Advanced Thermal Simulation Model for Power MOSFETs

Modern Power MOSFETs are widely used for high efficiency SMPS applications. Also, they provide very low on-resistance which reduces conduction losses in Oring or eFuse applications. These applications as well as others have transition states in which they drive the MOSFET in linear mode operation during turn-on and turn-off events respectively. The high cell density in modern Power MOSFETs provokes uneven current distribution in linear mode operation which locally stresses certain cell areas more than others. To prevent destruction, the SOA of these MOSFETs has a thermal limit line boundary imposed. With existing L3 MOSFET models it is possible to simulate temperature rise and power loss of the entire MOSFET. However, the local heating effect is not represented in this model. Here, a wrapper is being introduced. It converts a standard L3-model into a model that incorporates a dynamic representation of the entire SOA diagram. The temperature rise follows the hottest cell so that simulations in linear mode become a valid way to predict the highest junction temperature. The limitations of this approach will be outlined.

Modeling of control loop behavior of magamp post regulators

Small signal-control models are presented for a magnetic amplifier switching-mode post regulator for SMPS applications. Two commonly used current reset schemes are considered; an external reset scheme and a self-reset scheme. It is mathematically shown that the open-loop gain is a two-pole, single-zero transfer function for continuous-mode operation and is a single pole transfer function for discontinuous mode operation. The equations for predicting the open-loop gains for both types of reset circuits are derived and verified experimentally. It is shown that the open-loop gain characteristics of a magnetic-amplifier regulator depends on power circuit parameters, the reset-circuit parameters, and the saturable reactor parameters. Models for both continuous mode and discontinuous modes of operation that provide designers with useful tools for designing a compensation network for the feedback error amplifier are presented.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>