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 presents a hybrid switching scheme for LLC series-resonant half-bridge (SRHB) dc-dc converter. The concept of the proposed hybrid switching scheme is changing the switching mode to improve power efficiency in a wide load range. The SRHB converter operates in three different switching modes depending on the output load condition. Digital control of the system facilitates the implementation...
This paper presents an intelligent humane stunner for a multi-channel poultry stunning system with current sharing features. This proposed system consists of an interleaved buck-boost converter for driving the stunning system, a full bridge inverter for generating the stunning voltage, a half bridge inverter for generating dither voltages to expedite the breakdown of skin impedance, and a current...
In this paper, firstly, ITER power supply and its AC/DC converter in 2001 design have been introduced. Some import criteria such as FSC and internal bypass are reviewed and researched. The system overvoltage and low frequency oscillation have also been studied. Then some proposals to improve the ITER design and baseline have been presented, and these proposals have been validated and supported by...
Variable linear or nonlinear loads are critical for testing AC power supplies and power equipment in various operating conditions. At present, most testing loads are based on bulky resistors, capacitors, and inductors on which the testing energy is consumed to generate excessive heat, and moreover, the impedance value is limited by finite combination of these bulky loads. Some commercial electronic...
His paper presents the design and implementation of parallel connected 400 Hz frequency converters that supply power to military equipment. Achieving tight steady-state and transient voltage regulations and high efficiency in inverters with high fundamental frequency presents great challenge both on the control system design and the power stage design. This study develops and implements a controller...
This paper introduces a new three-phase adaptive notch filtering approach for the extraction of harmonic and reactive current components for use in grid connected converters. The main function of this PLL-less method is to provide synchronized harmonic and reactive current components for control purposes. Moreover, this method is capable of detecting a selective order of harmonics. This feature is...
In this paper, a new droop controller for parallel connected UPS inverters is presented. The proposed controller is based on the droop method in order to avoid the using of communication signals between the modules. The paper studies the control of the active and reactive power flow through the analysis of the output impedance of inverters and its impact on power sharing. As a consequence, we propose...
In this paper, a single-phase ac-dc converter is proposed. It is composed of N single-phase boost rectifiers in a parallel connection scheme. The proposed topology permits to reduce: the current and consequently the power ratings of the switches and the switching stress in dc-link capacitor. Also, it is proposed a PWM strategy, which allows reducing the THD of the grid current when compared to the...
State equations for resonant converters are developed by using orthogonal circuit synthesis. Low frequency state variables are selected for the resonant circuit, such as envelopes of resonant inductor current and resonant capacitor voltage, phase angle between inverter output voltage and output current. For a given resonant tank, its orthogonal counterpart is constructed. These two orthogonal tanks...
The Solid State Transformer (SST) is one of the key elements proposed in the National Science Foundation (NSF) Generation-III Engineering Research Center (ERC) ??Future Renewable Electric Energy Delivery and Management?? (FREEDM) Systems Center. The SST is used to enable active management of distributed renewable energy resources, energy storage devices and loads. In this paper, the Generation-I SST...
AC-DC converters for applications such as notebook adapters require operation over universal input mains range, and are challenged to achieve high efficiency over the entire range. Given the enclosed construction, and the demand for smaller, thinner adapters, they must be designed for high, yet relatively flat efficiency over the full mains range, to meet stringent thermal constraints. A novel two-stage...
Due to rising energy costs the efficiency of power electronics converter systems is of higher and higher importance, especially for applications with continuous operation as e.g. server power supplies. For designing such supplies numerous parameters like the switching frequency and the characteristic values and the geometry of magnetic components must be determined. In this paper, an optimisation...
Compact Fluorescent Lamp (CFL) and Light Emitting Diode (LED) are energy efficient light sources. However, they have a disadvantage that they cannot be directly dimmed with a triac dimmer. This article briefly explains the incompatibility issues, and suggests a CFL ballast circuit to overcome this disadvantage. The ballast is based on resonant mode topology, with additional circuitry for triac interface...
This paper presents a new zero current switching (ZCS) technique for a family of switched-capacitor dc-dc converters. Compared to the traditional ZCS switched-capacitor dc-dc converters by inserting a magnetic core in the circuit, these new ZCS switched-capacitor dc-dc converters employ the stray inductance present in the circuit as the resonant inductor and provide soft switching for the devices...
Half bridge magnetizing inductor (LmC) resonant dc/dc converter reduces the high current ripple of the output capacitor in LLC resonant converter maintaining narrow switching frequency and soft switching. This paper presents analysis and design of the half bridge LmC resonant converter. Using the extended describing function (EDF), the steady state analysis is carried out. Based on the results, the...
To improve the efficiency performance for the dc-dc converter used in extra wide input range applications, a novel resonant converter with a combinatorial LLC+C tank is proposed in this paper. The proposed resonant tank has a hybrid operational mode, which can operates as LLC resonant tank for high line input or as LLCC resonant tank for the low line input, realized by the topology shift through the...
This paper addresses the effect of the isolating transformer parasitic capacitor in soft switched converter topologies that apply triangular inductor current. When a transformer is included in the circuit, it will not only add (leakage) inductance to the converter but will also add capacitance. This capacitance will cause a partial resonance behavior and therefore may alter the voltage transfer ratio...
Aiming to reduce the volume and weight further, a novel coupled inductor is proposed in this paper. The implementation approaches and the operation principles are analyzed in detail along with the comparison analysis with three-leg coupled inductor. Two prototypes of two-phase 1 kW interleaved Boost converters are built to verify the theoretical analysis using the proposed or traditional three-leg...
This paper presents the design and implementation of a DSP-based single-stage photovoltaic (PV) inverter system which can extract maximum power from solar panel. A perturbation and observation (P&O) method is realized and cooperated with a digital unipolar voltage switching sinusoidal pulse width modulation. The studied single-stage topology provides the benefits of low cost, simple configuration...
The paper introduces a concept of load-interactive digitally controlled point-of-load (POL) dc-dc converters where the size of the output filter capacitor can be minimized based on the enhanced load-related communication between the digital load and the converter controller. Based on the information about upcoming load changes, the inductor current of the dc-dc converter is adjusted such that the...
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.