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This paper discusses the dead-time effect of dual bridge series resonant DC/DC converter (DBSRC). The phase-shift modulation is usually adopted in DBSRC. However, the phase-shift angle is usually small, and voltage polarity reversal (VPR) may occur in dead-time, which may deteriorate EMI/EMC and increase loss. This paper analyzes the commutation of DBSRC when VPR occurs and proposes a method to eliminate...
In order to improve steady and dynamic characteristics, a sliding mode control for a phase shifted full bridge DC/DC converter with fixed switching frequency is presented. Mode of the full bridge DC/DC converter is established by averaged current method. Linear combination of output voltage and its differential and integral is chosen to design sliding mode surface. The proposed algorithm is validated...
Multilevel inverters has acquire a great attention of modern power electronic systems. It offers less distortion and electro-magnetic interference and hence, it can be used in medium voltage and high power applications. The aim of this research article is to propose a new asymmetric type multilevel inverter with minimum number of power switches. The proposed inverter produces 7-level voltage waveform...
In This paper we are presenting a bidirectional DC-DC converter is also known as dual active bridge (DAB) dc-dc converter. We presented a Z-source with bidirectional dc-dc converter by reducing the switching count by adding the passive elements we are improving the output voltage level, Comparing with the traditional bidirectional dc-dc converter, the proposed converter has an wider regulation range...
In order to regulate the output voltage in converter system with four-quadrant characteristic a quasi-Z-Source Converter (qZSC) is preferred. The converter can provide bi-directional current and bipolar output voltage with minimal number of elements. In this converter two active switches with complimentary commands and a quasi-Z-source network is required and there is no need to coupled inductors...
Traction converters in automotive applications benefit from various emerging technologies like semiconductor-materials such as SiC or converter topologies like multilevel converters. As especially novel topologies often lack an analytic way to determine their power losses or efficiency, comparability is often hard to achieve until each converter is built up and measured. With the proposed procedure...
To efficiently implement the technology validation and test of power electronic devices, a new test method is presented, APF controller closed-loop simulation based on RTDS. Simulate those primary circuits by software in RTDS, such as three-phase grid, load and APF inverter bridge, DC side capacitor and circuit breaker. The APF control and protection part are done through the control panel in real...
Zero-Voltage and Zero-Current-Switching (ZVZCS) phase-shifted full-bridge (PS FB) pulse-width-modulated (PWM) converter, which can achieve Zero-Voltage-Switching (ZVS) of the leading leg and the Zero-Current-Switching (ZCS) of the lagging leg in a wide load range. It has the advantages of simple structure, less duty cycle loss and easy to implement soft switch and so on. In this paper, the working...
This paper discusses a novel multilevel inverter topology. Using only six power devices and two asymmetrical DC sources, the proposed topology is capable of synthesizing seven-level output voltage waveform. As will be seen, the proposed configuration uses the least number of power devices and DC sources as compared to the conventional topologies reported in the literature. Simulation results verifying...
In this paper, an auto tuning system that uses a variable synchronous switched capacitor for controlling the resonant frequency of the tank circuit of a half bridge voltage mode resonant converter for High intensity focused ultrasound (HIFU) applications is presented. The presented auto tuning system using a switched capacitor instead of a large inductor in the classical tuning topology. Hence, there...
This paper investigates two diagnosis methods based on switching voltage pattern for IGBTs open-circuit faults in voltage-source inverters. One is based on bridge arm pole voltage, and the other is based on bridge arm line voltage. With extra simple circuit, these two diagnosis methods can detect and identify single and multiple open-circuit faults of the inverter IGBTs effectively. The comparison...
In this paper, a novel cascade inverter system for SRM driving in which the higher voltage than the rated voltage of the switching device can be applied is proposed. Although a large variety of circuits for SRM have been proposed, asymmetric cascade inverter for SRM has not been reported. In this paper, the reason why the asymmetric cascade inverter for SRM has not been reported and a novel asymmetric...
DC/AC converters are widely used in several applications; traditionally they can be classified in two types: the voltage source inverters (VSI) and the current source inverters (CSI). Their use depends on the application; however some of them are common for both types of converters. Other possibility for the DC/AC conversion is the multilevel configuration, there have been proposed different topologies...
This paper proposes a novel quasi-resonant soft-switching Z-source inverter. On the basis of the Z-source inverter topology, the proposed inverter inherits the features of high voltage boost ability and circuit simplicity. A quasi-resonant network with only one auxiliary switch is employed to achieve the soft-switching scheme. All switches in the inverter bridge are turned on and off under zero-voltage...
The paper presents half-bridge topologies for single phase and three phase AC-AC electronic transformer application. The primary motivation for an electronic transformer is to reduce the weight of the core material needed for isolating low frequency (50–60Hz) AC lines. The half bridge electronic transformer topology achieves the needed isolation with high frequency magnetic components and without...
Abstract-A novel topology of three-phase-bridge (3P-bridge) cascaded PWM rectifier was proposed and analyzed in this paper. The two-level cascaded 3P-bridge topology is composed of three basic cells and the basic cell is a three-phase voltage source PWM converter; the line voltages in AC side of the converter are produced through cascaded way. The analysis results showed that the proposed converter...
The behavior of three-port bidirectional DC-DC converters (TPC) under soft-switching mode for hybrid electric vehicles is analyzed in this paper. The principle of power flow control and the operation under soft-switching mode are studied to establish the converter operation range. All this allows to establish design criteria to operate the TPC under soft-switching within a wide operation region. The...
This paper presents a design procedure for a full-bridge converter with IGBT transistors loaded with serial resonant circuit. The main concern was the reduction of the switching losses in order to increase converter efficiency and power density. One of the basic applications of this topology with serial resonant load is with the induction heating converters. Theoretical analysis of the switching power...
This paper proposes the development of dodecagonal (12-sided) space vector diagrams from cascaded H-Bridge inverters. As already reported in literatures, dodecagonal space vector diagrams have many advantages over conventional hexagonal ones. Some of them include the absence of 6n±1, (n=odd) harmonics from the phase voltage, and the extension of the linear modulation range. In this paper, a new power...
In the multi-level inverter with two or more separate DC sources, the cascaded topology is usually used. in this paper, a new two-input multi-level inverter for interfacing with renewable energy resources is developed. The objective of this research is to propose an alternative topology of hybrid cascaded multilevel inverter. The proposed topology can reduce the number of required power switches compared...
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