The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper proposes dynamic ramp control in current-mode adaptive on-time control for Buck converter on chip. It improves system stability and reduces output voltage at the load release. The concept of dynamic ramp control uses sample and hold circuit, comparator, and ramp valley control circuit adjusted according to the varied ramp signal to avoid the generation of an error pulse signal to regulate...
This paper presents some results of development of model of high voltage direct current system back-to-back link. The model based on concept of hybrid simulation, comprising three level of simulation: physical, analog and digital. The obtained results, including steps on the regulation references, recovery from severe perturbations in two-machine alternative current networks and ect, prove the advantages...
This paper represents design procedure of control system for interleaved bidirectional dc-dc converter. Dynamic model of the converter was compiled with help of steady-state analysis. The theoretical results were verified by means of modeling in PSIM package.
In process industries, PID control has been applied to controlled objects such as chemical plants. A cascade control system is applied in order to improve control performance by using several feedback loops. However, it is complicated to design a cascade control system because this control system includes plural controllers. In this paper, a design scheme of data-oriented cascade control system without...
Aiming at the complicated control problem of the existing inductively coupled power transfer system, a self-oscillating control method for the push-pull resonant converter with parallel-series compensation is proposed. The necessity of designing the start-up circuit is explained by illustrating the principle of self-oscillating control. Based on the analysis of the energy transfer mechanism of the...
This paper proposes the high voltage gain quadratic boost converter for supplying standalone ac loads using renewable power supply that generates dc power at low voltages. A fixed frequency SMC has been proposed in this paper to regulate the dc link capacitor voltage. The conventional SMC has variable switching frequency while leads to the damage of passive components as well as unpredictable response...
The boost inverter is an attractive solution for photovoltaic (PV) microinverters since it is a single stage architecture. Indeed, in comparison, most of the microinverters topologies consist of two-stage structures, a DC-DC converter for voltage elevation and an inverter for grid connection, resulting in a lower efficiency. The boost inverter consists of two DC-DC boost converters connected in differential...
This paper studies and compares control schemes for fully-integrated step-up dc-dc converters. The paper analyzes both a pulse-width-modulated and a pulse-frequency-modulated control schemes, and discusses the differences in terms of load currents and output voltages. Both control schemes were designed and simulated in a CMOS 65-nm technology. The paper also compares the analytic models to simulation...
The multiplicity of transactions frequently leads to the conditions where the operating zone will not remain secure in the field of emerging electric power systems. In the system of power security advancement, the highly Flexible AC transmission systems (FACTs) controllers will play a prime role. But because of large scale capital investment it is required to locate the FACTs controllers in the power...
The number of mobile device users increases every year. Each mobile device is usually equipped with a Li-ion battery having voltage that varies from a minimum of 2.7V to a maximum of 4.2V. Therefore, as the battery voltage decreases with time, a DC-DC converter is required for a regulated supply lower or higher than the battery voltage. A simple buck converter is not suited for this case, since step-up...
Parallel connected systems constructed by connecting existing power converters in parallel have low costs and can provide large short term output. They can also be easily constructed if the allotment of the converters' output current can be controlled to different values. In this type of construction, however, it is important to reduce the cross current that flows between the converters. This paper...
In this paper, we proposed a novel resistor free ZCD control method for critical conduction mode PFC to improve the problem raised from the existence of the current sensing resistor and the conventional studies without the current sensing resistor. Characteristics of the proposed topology at steady-state was described, and the feasible optimal design process was also reported with simulations and...
The traditional Buck-boost non-dissipative equalization circuit is often used in series connected battery packs to balance the battery voltage, which usually results in the slow equalization speed and uncontrollable equalizing current. In order to complete the equalization process as soon as possible, this paper introduces paralleled voltage and current closed loop control strategy to quantitatively...
This paper proposes a modified quadratic boost converter with high efficiency and reduced cost. This converter mainly comprises of the quadratic part. The newly proposed converter in this paper is compared with a quasi z source converter which is a quadratic boost converter. The current ripples, cost, efficiency, losses and the complexity of the converters are considered. The steady state analysis...
This paper presents the decoupled active and reactive power control (PQ control), using a Phase-Locked Loop (PLL) for synchronization, and applied to the control of Multicellular Parallel Inverter (MPI) for a grid-connected Photovoltaic (PV) system. We explain the value of this multicellular structure of inverter compared to a conventional inverter. We also present and discuss the simulation results...
This paper proposes a single-bit ADC system based Proportional and Integral (PI) controller to regulate the output voltage of Capacitive Power Transfer (CPT) systems. A simple single-bit ADC system i.e., Single-Bit Modulator (SBM) is considered as an alternative to the commonly used multi-bit ADC systems. Unique features of employing SBM are 1) its ability to convert analog signals into single-bit...
Hybridization of energy sources gives better reliability and flexibility for the power generation system. For integrating different sources, a suitable power electronic interface and a power management strategy are mandatory requirements. In this paper, implementation of closed loop controller for a dual input single output DC-DC converter to integrate two different VI characteristic sources for DC...
This paper presents a novel control scheme for the output voltage tracking problem of dc-dc buck converter. The proposed control structure integrates a direct adaptive backstepping control approach with a single functional layer Hermite neural network (HNN). Buck converter is a variable structure model with a highly uncertain loading pattern. Hence an estimator based on HNN is employed to estimate...
The conventional energy present today is limited to fulfill the demand of automobile engineering. To explore renewable energy in automobile engineering the source needed for applications can be renewable sources. Now-a-days Electric Vehicles are battery operated and to charge the battery the renewable sources are used. This paper highlights on power from multiple sources to charge batteries by using...
Recently the issues of reactive power compensation and voltage control have become important in the operation of power systems, due to the constant growth of world demand as well as diversification of the connected load. Several solutions have been developed to provide greater flexibility to power systems during light load and maximum demand condition. These are two of the most critical conditions...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.