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Hybrid transformer ZVS/ZCS DC-DC converter with optimized magnetic and improved power devices utilization for photovoltaic module applications

Category : Power Electronics


Sub Category : DC TO DC CONVERTERS (CHOPPERS)


Project Code : ITPW11


Project Desc : This paper presents a nonisolated, high boost ratio dc-dc converter with the application for photovoltaic (PV) modules. The proposed converter utilizes a hybrid transformer to incorporate the resonant operation mode into a traditional high boost ratio active-clamp coupled-inductor pulse-width-modulation dc-dc converter, achieving zero-voltage-switching (ZVS) turn-on of active switches and zero-current-switching-turn-off of diodes.

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Isolated AC/DC offline high power factor single-switch led drivers without electrolytic capacitors

Category : Power Electronics


Sub Category : DC TO DC CONVERTERS (CHOPPERS)


Project Code : ITPW12


Project Desc : Energy-efficient residential lighting such as household Light-Emitting Diode (LED) lamps with AC input require an AC/DC converter (or driver) with large output capacitance to minimize the low frequency LED current ripple. The energy storage capacitor used in the conventional AC/DC LED driver is usually an electrolytic capacitor due to its low cost and high energy density. However, the average lifetime of an electrolytic capacitor is at least 2 to 3 times less than that of a LED device.

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Non-isolated high step-up DC-DC converters adopting switched-capacitor cell

Category : Power Electronics


Sub Category : DC TO DC CONVERTERS (CHOPPERS)


Project Code : ITPW13


Project Desc : The basic idea is that when the switch is turned on, the inductor is charged, and the capacitors are connected in series to supply the load, and when the switch is turned off, the inductor releases energy to charge multiple capacitors in parallel, whose voltages are controlled by a pulse width modulation technique.

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Performance of medium-voltage dc-bus pv system architecture utilizing high-gain DC-DC converter

Category : Power Electronics


Sub Category : DC TO DC CONVERTERS (CHOPPERS)


Project Code : ITPW14


Project Desc : The number of large-scale solar photovoltaic (pv) systems continues to increase, while the size of the largest systems has already reached several hundred megawatts. this trend will challenge existing pv system architectures and will require new pv system architectures with higher power ratings and higher voltage levels at the point of common coupling (pcc).

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Soft switching DC-DC converter for distributed energy sources with high step up voltage capability

Category : Power Electronics


Sub Category : DC TO DC CONVERTERS (CHOPPERS)


Project Code : ITPW15


Project Desc : This paper presents high step-up DC to DC converter for low voltage sources like solar PV, fuel cells and battery banks. To achieve high voltage gain without la RGE duty cycle operation, combination of coupled inductor and switched capacitor voltage doublers cells are used.

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A high voltage gain dc-dc converter integrating coupled-inductor and diode-capacitor techniques

Category : Power Electronics


Sub Category : DC TO DC CONVERTERS (CHOPPERS)


Project Code : ITPW16


Project Desc : The proposed converter achieves extremely large voltage conversion ratio with appropriate duty cycle and reduction of voltage stress on the power devices. Moreover, the energy stored in leakage inductance of coupled inductor is efficiently recycled to the output, and the voltage doubler cell also operates as a regenerative clamping circuit, alleviating the problem of potential resonance between the leakage inductance and the junction capacitor of output diode.

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Soft-switching current-fed push-pull converter for 250-w ac module applications

Category : Power Electronics


Sub Category : DC TO DC CONVERTERS (CHOPPERS)


Project Code : ITPW17


Project Desc : In this project, a soft-switching single-inductor push-pull converter is proposed. A push-pull converter is suitable for low-voltage photovoltaic ac module systems, because the step-up ratio of the high-frequency transformer is high, and the number of primary-side switches is relatively small. However, the conventional push-pull converter does not have high efficiency because of high-switching losses due to hard switching and transformer losses (copper and iron losses) as a result of the high turn ratio of the transformer.

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A new common-mode transformer less photovoltaic inverter

Category : Power Electronics


Sub Category : DC TO AC CONVERTERS (INVERTERS)


Project Code : ITPW18


Project Desc : Transformer less inverter is being widely used in grid-connected photovoltaic (PV) generation systems. Transformer elimination, in grid-connected PV systems, has many advantages. This not only reduces cost, size and weight, but also increases the whole system efficiency.

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A quasi-unipolar SPWM full-bridge transformer less pv grid-connected inverter with constant common-mode voltage

Category : Power Electronics


Sub Category : DC TO AC CONVERTERS (INVERTERS)


Project Code : ITPW19


Project Desc : The unipolar sinusoidal pulse width modulation (SPWM) full-bridge transformer less photovoltaic inverter with ac Bypass brings low conduction loss and low leakage current. In order to better eliminate the leakage current induced by the common mode voltage, the clamping technology can be adopted to hold the common-mode voltage on a constant value in the freewheeling period.

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A single-phase cascaded multilevel inverter based on a new basic unit with reduced number of power switches

Category : Power Electronics


Sub Category : DC TO AC CONVERTERS (INVERTERS)


Project Code : ITPW20


Project Desc : In this paper, a new single-phase cascaded multilevel inverter is proposed. This inverter is comprised of a series connection of the proposed basic unit and is able to only generate positive levels at the output. Therefore, an H-bridge is added to the proposed inverter. This inverter is called the developed cascaded multilevel inverter.

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