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This paper introduces a new single-switch nonisolated dc-dc converter with very high voltage transfer ratio and reduced semiconductor voltage stress. The converter utilizes an integrated autotransformer and a coupled inductor on the same core to achieve a high step-up voltage gain without extreme duty cycle. Further, an integrated passive regenerative circuit recycles the leakage energy of the coupled...
A dual-phase-shift controlled isolated buck-boost converter is presented for wide input or output voltage range applications. Two transformers and a voltage-doubler rectifier with embedded bidirectional switch are employed. The primary windings of the two transformers are in series and the secondary windings are in parallel. With optimized dual-phase-shift modulation strategies, zero voltage switching...
Nowadays, due to the increasing interest on low voltage renewable energy sources, like those based on photovoltaic modules and fuel-cells, an intensive academic and industrial research has been focusing on high step-up ratio DC-DC converters. One simple way to implement a high gain converter is to combine a boost topology at the input stage with a number of voltage multiplier cells, in order to step-up...
Reliability stress testing of power semiconductors requires significant development effort for a test apparatus to provide the required functionality. This paper presents a modular test system architecture which focuses on flexibility, reusability and adaptability to future test requirements. Different types of tests for different devices in application circuit configuration can be implemented based...
Silicon Carbide as an emerging technology offers potential benefits compared to the currently used Silicon. One of these advantages is higher efficiency. If this is targeted, reducing the on-state losses is a possibility to achieve it. Parallel-connecting devices decrease the on-state resistance and therefore reducing the losses. Furthermore, increasing the amount of components introduces an undesired...
This paper proposes an improved impedance (Z) source inverter topology. Compared to the traditional impedance-source inverter, it can reduce Z-source inverter device voltage stress significantly to perform the same voltage boost, and provides the controllable and stable output power in all load condition. The control strategy of the proposed Z-source inverter is exactly the same as the traditional...
This paper presents a new bidirectional multilevel modular switched-capacitor dc-dc converter for high voltage and high conversion ratio application with low capacitor voltage rating. For the high voltage and high conversion ratio application, high voltage capacitor with good performance will not be available either, like the switching devices. For the traditional multilevel modular switched-capacitor...
Light-Emitting Diodes (LEDs) has become a very promising alternative lighting source with the advantages of longer lifetime and higher efficiency than traditional ones. The lifetime prediction of LEDs is important to guide the LED system designers to fulfill the design specifications and to benchmark the cost-competitiveness of different lighting technologies. The existing lifetime data released by...
A novel high efficiency high step-up DC-DC converter is proposed in this paper. The proposed converter can achieve high voltage ratio with appropriate duty cycle by using the coupled-inductor and cascode technique. In order to achieve high efficiency, a capacitor is used to recycle the leakage energy of the coupled-inductor and reduce the voltage stress on the switch. Therefore, the low-voltage rating...
A compact modular switched-capacitor DC/DC converter with exponential voltage gain, high efficiency, light weight, and bidirectional power flow, is proposed in this paper. The proposed converter is suitable for applications in high temperature environments since it does not contain magnetic element nor temperature-sensitive capacitor. With an output voltage that is 2N (N is the cell number) times...
In this paper, a bridgeless Cuk derived AC/DC converter is proposed. The present circuit topology separates the input PFC current and output voltage-regulation current, which reduces the switch current stresses and improves system thermal management compared to the conventional bridge and bridgeless Cuk topologies. In addition, the proposed bridgeless topology has semi-soft switching function of all...
In this paper, an attempt has been made to demonstrate various package design considerations to accommodate series connection of high voltage Si-IGBT (6500V/25A die) and SiC-Diode (6500V/25A die). The effects of connecting the cathode of the series diode to the collector of the IGBT versus connecting the emitter of the IGBT to the anode of the series diode have been analyzed in regards to parasitic...
A new approach for static reactive power compensation has been presented in this paper. Conventional thyristor controlled Static VAr Compensators (SVC) have inherent disadvantages like slow response times and poor harmonic performance as these FACTS devices are based on slow switching power electronics devices. Alternately, Pulse Width Modulated (PWM) dc-ac inverters and direct ac-ac converter structures...
In this paper is proposed a novel single-phase PWM bridgeless rectifier, based on SEPIC converter topology, integrated with a modified switched capacitor cell. The structure has the absence of the diode bridge at the input port reducing the number of components and conduction losses. Besides, it has the presence of a switched capacitor cell, providing double gain at the output voltage. A comparison...
Electric power take-off systems in automotives requires the application of low voltage high current step up DC-DC converter with a high voltage gain. Researchers have evaluated enhancements for high efficiency and low cost designs. In this paper, a novel topology is proposed that has the capability of providing a high voltage gain over a wide range of output power. It also has fewer components and...
This paper proposes a simplified vector control method with output capacitor voltage balance for voltage oriented control of the three-level three-switch Vienna rectifier. The proposed control method makes use of a single carrier based pulse width modulated (PWM) switching technique instead of complex space vector method for the Vienna rectifier. The vector control method is comprehensively compared...
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