scholarly journals Design of Optimal QFT Controller and Prefilter for Buck Converter Using Metaheuristic Algorithms

2018 ◽  
Vol 2018 ◽  
pp. 1-17
Author(s):  
Nitish Katal ◽  
Shiv Narayan
Keyword(s):  
Input Voltage ◽  
Industrial Applications ◽  
Single Step ◽  
Buck Converter ◽  
Controller Synthesis ◽  
Metaheuristic Algorithms ◽  
Robust Controller ◽  
Switching Regulator ◽  
Optimal Gains ◽  
A Current

A buck converter is a step-down switching regulator. Buck convertors are being widely used in industrial applications that rely on regulated output voltage under fluctuating input voltage. A buck convertor works in the following modes: (a) current-controlled or (b) voltage-controlled mode. But these convertors manifest several nonlinearites because of the switching operation. Hence, in order to generate a quality output of the convertor, the design of a controller becomes crucial. In this paper, the synthesis of a QFT-based robust controller and prefilter has been carried out for an uncertain buck converter with varying input voltage and varying load. The controller synthesis problem has been posed as an optimization problem, and metaheuristic algorithms have been used for obtaining the optimal gains for the QFT controller and prefilter. By doing this, the QFT synthesis can be carried out in a single step instead of following the sequential classical QFT process on Nichols charts and the need for the generation of templates and bounds has be eliminated. The designed 2-degree-of-freedom QFT control system offers a robust behavior and efficiently handles the parametric uncertainties. The robustness of the designed controller has been confirmed through simulation results for large input voltage and load fluctuations.

New High Temperature Electronic Components for Power Management and Motor Control Applications

2010 ◽  
Vol 2010 (HITEC) ◽  
pp. 000207-000213
Author(s):  
Pierre Delatte ◽  
V. Dessard ◽  
A. Saib ◽  
N. Pequignot ◽  
G. Picún ◽  
...  
Keyword(s):  
Motor Control ◽  
High Temperature ◽  
Power Management ◽  
Supply Voltage ◽  
Input Voltage ◽  
Industrial Applications ◽  
Buck Converter ◽  
Active Components ◽  
Power Transistors ◽  
Power Modules

This paper presenst CISSOID's new high temperature chips for Power Management and Motor Control in automotive, oil & gas, aerospace and industrial applications. High temperature DC-DC reference designs, called respectively ETNA, VESUVIO™ and EREBUS™, have been announced recently. These Buck (step-down) DC-DC converters are built with proven CISSOID products as active components rated from −55°C up to 225°C. These DC-DC converters can have input voltages from 6V up to 50V. The output voltage can be adjusted from 10% up to 90% of the input voltage. Power efficiencies in excess of 90% above 200°C have been demonstrated. VESUVIO™ and EREBUS™ are based on MAGMA PWM controller, HYPERION half-bridge driver and two power transistors to implement a synchronous Buck converter. For high voltage and power levels, new Silicon-Carbide devices allow operating at high junction temperatures. They enable high power modules with higher densities in terms of size and weight. Having power drivers able to operate very close to these devices allow further integration of power modules while increasing the performances thanks to lower parasitic capacitances and inductances. This will also ease to increase switching frequencies, another key advantage of these new devices. For these applications, CISSOID has released PROMETHEUS I Power Driver reference design that can sink and source currents up to 2Amps at a supply voltage from 11V up to 30V. Recently announced PROMETHEUS II design, based on HYPERION driver, enables rise and fall times of 25ns on a 1nF load.

scholarly journals A Current-Mode Four-Phase Synchronous Buck Converter with Dynamic Dead-Time Control

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Jun Tang ◽  
Tian Guo ◽  
Jung Sik Kim ◽  
Jeongjin Roh
Keyword(s):  
Dead Time ◽  
Current Mode ◽  
Buck Converter ◽  
Time Control ◽  
A Current

COMPLEX DYNAMICS AND FAST-SLOW SCALE INSTABILITY IN CURRENT-MODE CONTROLLED BUCK CONVERTER WITH CONSTANT CURRENT LOAD

2013 ◽  
Vol 23 (04) ◽  
pp. 1350062 ◽  
Author(s):  
GUOHUA ZHOU ◽  
BOCHENG BAO ◽  
JIANPING XU
Keyword(s):  
Complex Dynamics ◽  
Period Doubling ◽  
Current Mode ◽  
Input Voltage ◽  
Second Order ◽  
Buck Converter ◽  
Constant Current ◽  
Current Load ◽  
Time Model ◽  
Conduction Mode

The complex dynamics and coexisting fast-slow scale instability in current-mode controlled buck converter with constant current load (CCL), operating in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM), are investigated in this paper. Via cycle-by-cycle computer simulation and experimental measurement of current-mode controlled buck converter with CCL, it is found that a unique fast-slow scale instability exists in the second-order switching converter. It is also found that a unique period-doubling accompanied by Neimark–Sacker bifurcation exists in this simple second-order converter, which is different from period-doubling or Neimark–Sacker bifurcations reported previously. Based on a nonlinear discrete-time model and the corresponding Jacobian, the effects of CCL and input voltage on the dynamics of current-mode controlled buck converter are investigated and verified theoretically. Fixed point analysis for slow-scale low-frequency oscillation is also given to verify the dynamics and the coexisting fast-slow scale instability.

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