Eighteenth lecture / electronic circuit design

2014

The newly proposed Z-source chopper with two controlled switches is used to stabilize the duty cycle above 0.5 is presented. The device has boost capability without polarity reversal in the range of duty cycle 0 to 0.5 and buck-boost capability with polarity reversal of output voltage in the range of duty cycle 0.5 to 1. The above capabilities of the topology are studied through simulation. This paper also presents transient modeling of the proposed Z-source chopper with and without ESR (equivalent series resistance). The effects of ESR are studied in depth and based upon the transient modeling; the dc-link voltage is controlled by direct measurement of capacitor voltage and inductor current. The presence of RHP (right-half-plane) zero in developed average control-to-output model reveal that the output decreases initially before rising toward its new steady-state value when a step increase in control input is applied. The non-minimum-phase transient response can be reduced by proper...

— Static converters are used in various fields of the conversion of electrical energy. The significant development of electric power switches and variety of design techniques of control and regulation circuits provide very advantageous solutions for the congestion, reliability, performance and maintenance of converters. This work focuses on the study and simulation of a chopper Series, and its association with a photovoltaic generator for the purpose of a Maximum Power in Operation issued by the latter. The principle of the chopper control is based on the variation of the duty ratio, based on a percentage of the open circuit voltage of a solar cell driver. The operation control system helps the photovoltaic system to function at its maximum power.

World Journal of Engineering, 2014

International Journal of Engineering Technologies and Management Research, 2021

The aim of this research is to design a control power circuit which has the ability to operate the solenoid valve, the pump and the DC motor of the bottle illing machine. This circuit contains of three main parts the PIC16F876a, the Interface Circuit and the Snabber Circuit. The power circuit is supplied by 110 V. The microcontroller (PIC 16F876a) is supplied by 5 V. The power switch MOSFET is supplied by 24 V. The Snabber Circuit and the interface circuit are designed in this research. The purpose and the role of the Snabber circuit and the Interface Circuit in the power control circuit are determined in this research.

2011

Due to its simplicity, low voltage stress, high reliability, low switch and inductor losses, and small inductor size, the non-inverting buck-boost chopper has found a lot of attentions in applications where it is necessary to step-up or stepdown the DC voltage. In this paper, a successful switching strategy for this converter is reported and small signal averaged state-space model is obtained, which lets decide about the control strategy and analyse the stability and performance of the closed loop control system. Appropriate control requirements have been defined and the closed loop performance under several control strategies has been investigated through extensive simulations.

2019

Designing two degree of freedom controller to control the boost chopper system is challenging. A new feedforward combined with feedback controller design is proposed. Increasing the efficiency of the DC-DC converters can be achieved by decreasing the distortion and noise for both input and output stages in the system. A linearization mathematical model analysis for boost chopper is presented. Both the input voltage with multiple steps and the duty cycle of PWM which control the switching circuit were applied to study the behaviour of the system. In this study, the simulation results show that the disturbance rejection and input tracking were improved for different cases and situations. Also, the results show that the proposed method can be adapted by redesigning the feedforward controller to recover the impact of the boost parameter changes.

The Fifth International Conference on Electronics and Software Science (ICESS2019), 2019

Photovoltaic power generations (PVG) have been used generally and spread broadly. Various power conditioning systems used in those have been also studied by many researchers. In addition to usual utilization, such PVG is often equipped for the time of disaster. Usually such solar panels having limited power are almost installed in limited area such as on top of the roof of the building. Some medical institutions have fairly desire to keep such PVG since they must avoid the medical service interruption. The generating power in such case is fair limited, so the system construction should balance the reduced power. Thus, it is necessary to improve the construction toward simple one. In usual PCS, power is converted by two stages, that is boost converter and normal inverter. In first stage, the dc power is adjusted to appropriate value. The conversion methods are presented in many strategies. In this paper, in order to pursue an ideal one, simple and concise power converter, especially novel boost chopper is proposed. Considering fair reduced power and narrow space of installation, the system constructions should be compact. The circuit which gratifies their operating characteristic is presented and analytically discussed about circuit construction as a novel boost converter. The circuit operation is confirmed by using the circuit software and a few experiments.

2015

Certain advancement in the automotive embedded electronics in car and applications the capacity of the current 14 volt voltage system no longer meets the demand of the on-board devices. In order to be backward compatible with the existing 14v system and to introduce extensive modifications, a dual 14v/42v is being developed as a compromising solution to the problem. Based on the new system this article is proposes a synchronous buck/boost converter an attractive topology for 42V/14V dual voltage systems since it offers the possibility of bidirectional operation without additional components. In this paper, transient currents generated during converter startup or changes in operation modes between buck and boost are analyzed and a cost effective solution to remove the transient currents is proposed. The validity of the proposed control strategy is investigated through simulation and experiment with bi-directional converters. Index TermBi-Directional DC-DC Converter, Dual Voltage Syst...

International Journal of Electronics, 1989

The harmonic analysis of a proposed type of a.c. voltage controller is presented. The suggested controller has four gate turn-off thyristors (GTOs) connected antiparallel, two of which are used for bidirectional free wheeling while the other two are in series with the main supply lines. The analysis presented compares the controller performance under different control regimes. The regimes studied are (a) controllable mark-to-space ratio, (b) naturally sampled pulse-width modulation (PWM) and (c) regularly sampled PWM. It is shown that the proposed scheme yielded better performance compared to conventional phase-angle control due to the high-frequency switching involved in the former. Moreover, the controllable mark-to-space ratio method was found to be more convenient on account of its simplicity, wide range of control and reasonable harmonic content. A microprocessor-based a.c. voltage controller was constructed and test results relating to the mark-to-space ratio technique show good correlation with theoretical values.