Observer based control scheme for DC-DC boost converter using sigma–delta modulator

2018 ◽  
Vol 37 (2) ◽  
pp. 784-798 ◽  
Author(s):  
Milad Malekzadeh ◽  
Alireza Khosravi ◽  
Mehdi Tavan
Keyword(s):  
Input Voltage ◽  
Boost Converter ◽  
Nonlinear Observer ◽  
Resistive Load ◽  
Nonlinear Controller ◽  
Sigma Delta Modulator ◽  
Sigma Delta ◽  
Content Type ◽  
Control Scheme ◽  
Controller Performance

PurposeIn actual application of a DC-DC boost converter, the input voltage and resistive load may be changed frequently, and these variations deteriorate the conventional controller performance. The purpose of this paper is to present an observer-based control scheme for a DC-DC boost converter with an unknown resistive load and input voltage. Design/methodology/approachTo estimate the unknown input voltage and resistive load, a nonlinear observer is designed by using the Lyapunov stability theorem. In addition, the closed-loop stability of the proposed control scheme for the DC-DC boost converter is proven. To convert the continuous control input to discrete mode, a sigma–delta modulator is used. FindingsThe proposed control scheme is validated in different situations. The adaptive structure of the proposed control scheme is tested by the input voltage, load and reference signal variation, and the simulation results confirm the capability of the proposed observer-based control strategy. Originality/valueThe contribution of this paper is twofold: according to nonlinear controller design, the feedforward term of the nonlinear controller is obtained via the observer, and unlike the proportional–integral controller, performance deterioration in the input voltage and load variations are unraveled. The effectiveness of this method is validated by experimental implementation in the presence of load and input voltage variations, and the experimental results confirm the efficacy of the proposed strategy.

Single-loop sigma delta modulator design and verification for cognitive IoT applications

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Vamsee Krishna S. ◽  
Sudhakara Reddy P. ◽  
Chandra Mohan Reddy S.
Keyword(s):  
Discrete Time ◽  
Noise Shaping ◽  
Third Order ◽  
Sigma Delta Modulator ◽  
Sigma Delta ◽  
Content Type ◽  
Power Efficient ◽  
Single Loop ◽  
Physiological Signal ◽  
Iot Applications

Purpose A third-order discrete time sigma delta modulator (SDM) is proposed with optimum performance by addressing instability and power dissipations issues, and a novel SDM architecture is designed and verified in behavioural modelling in MATLAB/SIMULINK environment. Simulation results show that performance parameters of proposed modulator achieved SNR of 105.41 dB, SNDR of 101.96 dB and DR of 17 bits for the signal bandwidth of 20 kHz. Design/methodology/approach This paper describes single-loop SDM design with optimum selection of integrator weights for physiological signal processing in IoT applications. Findings The proposed discrete time modulator designed with 1-bit quantizer and optimum oversampling ratio proved as power efficient. Integrator scaling coefficients are generated in LabVIEW environment for pure third-order noise shaping. Originality/value This paper contains the novelty in the work, and it is suitable for cognitive Internet of Things applications.

scholarly journals Modeling and simulation of DC to DC boost converter using single phase matrix converter topology

2020 ◽  
Vol 11 (2) ◽  
pp. 774
Author(s):  
Fajariah Kadir ◽  
S.Z. Mohammad Noor ◽  
Faranadia A.H. ◽  
K.S. Muhammad
Keyword(s):  
Single Phase ◽  
Pulse Width Modulation ◽  
Input Voltage ◽  
Boost Converter ◽  
Matrix Converter ◽  
Switching Frequency ◽  
Resistive Load ◽  
Insulated Gate Bipolar Transistor ◽  
Voltage Spike ◽  
Four Quadrant

The main objective of this work is to model and simulate DC to DC Boost Converter using Single Phase Matrix Converter (SPMC) topology using MATLAB/Simulink (MLS). The output voltage is controlled by using Pulse Width Modulation (PWM) technique. Four pairs of Insulated Gate Bipolar Transistor (IGBT) is used as the switching device where for each pair, it is located in parallel and opposite direction. Safe commutation technique is performed in preventing voltage spike at the output. Through the simulation, at switching frequency of 25kHz, the model is able to step up its input voltage about two times larger and all of the results achieved a good agreement with the principle of four quadrant operation. It is also realized that without the implementation of safe commutation technique, spikes were generated and the model is unable to boost its input voltage. All of the selected results from the analysis which includes variation of quadrant, switching frequency, duty cycle and resistive load are presented in this paper.

Design of backstepping control with CNN-based compensator for active magnetic bearing system subjected to input voltage saturation

2018 ◽  
Vol 15 (6) ◽  
pp. 678-687 ◽  
Author(s):  
Avadh Pati ◽  
Richa Negi
Keyword(s):  
Input Voltage ◽  
Magnetic Bearing ◽  
Backstepping Control ◽  
Active Magnetic Bearing ◽  
Control Technique ◽  
Content Type ◽  
Single Degree ◽  
Control Scheme ◽  
Amb System ◽  
Voltage Saturation

Purpose The stability and input voltage saturation is a common problem associated with an active magnetic bearing (AMB) system. The purpose of this paper is to design a control scheme that stabilizes the single degree of freedom AMB system and also tackle the problem of input voltage saturation in the AMB system. Design/methodology/approach The proposed control technique is a combination of two separate control schemes. First, the Backstepping control scheme is designed to stabilize and control the AMB system and then Chebyshev neural network (CNN)-based compensator is designed to tackle the input voltage saturation when the system control action is saturated. Findings The mathematical and simulation results are presented to validate the effectiveness of proposed methodology for single-degree freedom AMB system. Originality/value This paper introduces a CNN-based compensator with Backstepping control strategy to stabilize and tackle the problem of input voltage saturation in the 1-DOF AMB systems.

Analysis, Design and Implementation of DC-DC Boost Converter Using H∞ Loop Shaping Controller

2014 ◽  
Vol 622 ◽  
pp. 1-9
Author(s):  
Devaraj Tamilarasi ◽  
A. Abdul Namith ◽  
T.S. Sivakumaran
Keyword(s):  
Closed Loop ◽  
Pulse Width Modulation ◽  
Input Voltage ◽  
Boost Converter ◽  
Control Voltage ◽  
Loop Shaping ◽  
Control Scheme ◽  
Analysis Design ◽  
Classical Control ◽  
High Rejection

This paper proposes the H∞ loop shaping control scheme for DC-DC boost converter using Pulse-width modulation (PWM) techniques. The averaged linear model of the boost converter is developed for three controllers namely classical control (voltage mode), post modern control (H∞ control) and H∞ loop shaping using Ricatti equations which guarantee stability and the desired closed loop dynamic response. The experimental results are accomplished using DSP TMS320LF2407 validated with simulation results that shows the proposed H∞ loop shaping controller has better performances with good tracking and high rejection capability when disturbances are introduced due to changes of load and input voltage.

Sensor Signal Digitization Utilizing a Band-Pass Sigma-Delta Modulator

2009 ◽  
Vol E92-C (6) ◽  
pp. 860-863 ◽  
Author(s):  
Lukas FUJCIK ◽  
Linus MICHAELI ◽  
Jiri HAZE ◽  
Radimir VRBA
Keyword(s):  
Sensor Signal ◽  
Sigma Delta Modulator ◽  
Sigma Delta ◽  
Band Pass
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