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Many applications, such as residential grid-connected photovoltaic (PV) system, fuel cells, thermoelectric generators (TEG), and high intensity discharge (HID) lamp ballast used in automotive systems, require high step-up dc-dc converters. In this paper an inductor-less, bidirectional, high step-up dc-dc converter topology is proposed. At high temperature, performance of magnetic components degrades...
This paper investigates nonlinear control methods for single-ended primary-inductor converters (SEPIC). The fast-switching and average models show the converter nonlinearity in terms of inductor currents, capacitor voltages, and the switching duty cycle. The control law intuitively should be nonlinear to drive and guarantee the system stability. Two different control laws based on the passivity and...
High gain DC-DC converters have become increasingly popular in recent years as there is greater need to interface low voltage DC sources such as solar cells and batteries with much higher voltage DC buses. A new high gain DC-DC converter with high gain, galvanic isolation and an integrated passive snubber network is proposed in the paper. In the paper, the general operation of the converter is discussed,...
Due to the intermittent feature of renewable energy sources, energy storage units are needed in order to balance the electricity generation and consumption. Interface circuit is an important component of the energy storage system. This paper presents a non-isolated four-port dc-dc converter for the independent photovoltaic power generation system. The proposed four-port dc-dc convert is used to interface...
This paper proposes an adaptive democratic current sharing control scheme for interleaved dc-dc converters under faulty condition. The proposed fault tolerant control approach can achieve the desired output voltage generation, and equal current sharing among the remaining healthy modules as more and more modules fail. The main idea is to adaptively change the outer voltage and inner current controller...
A simplified shoot-through pulse width modulation (PWM) technique is presented for reducing switching losses in impedance source DC-DC converters. The proposed PWM method alternates shoot-through state conduction in each leg of the H-bridge, thereby increasing controllability of the converter, reducing the number of switching transients, and reducing the dynamic loss of the converter through soft-switching...
This paper proposes a single-stage high-power-factor asymmetrical half-bridge AC-DC converter for power factor correction. The proposed converter is developed by integrating an asymmetrical half-bridge DC-DC converter with a set of coupled inductors and a blocking diode to achieve the single-stage AC-DC conversion with the buck-boost type power factor correction. By using the coupled inductors, the...
The use of wide-bandgap (WBG) devices in power converters provides several advantages in terms of efficiency, power density and low cooling requirements. However, a potential unwanted side-effect is the increased electromagnetic interference (EMI) noise, the basis of which is the high di/dt and dv/dt realized by the characteristic sharp rise and fall switching offered by the WBG power switches. To...
Multi-megawatt scale isolated DC-DC converters are likely to become increasingly popular as means to interconnect the MVDC grids of different voltage levels. Three-phase dual active bridge DC-DC (3DAB) converters operating with the zero-voltage switching (ZVS) is a promising candidate for the target multi-megawatt application. This paper presents a systematic approach of the design considerations...
In this paper, a non-isolated interleaved input-parallel output series structure soft-switching bidirectional dc-dc converter with PWM plus phase shift (PPS) control is proposed. The proposed converter can achieve zero-voltage-switching (ZVS) of all switches in continuous current mode (CCM) under bidirectional power flow. Even though step-up/down ratio is about 3.5 times compared to the conventional...
A modern smart battery charger is made of a Dc-Dc converter working in two modes: Charge and Boost. The Zero Cross Detector (ZCD) circuit is a highly important block in a Dc-Dc converter for achieving low switching losses. This paper presents a new approach to a ZCD converter which works by predicting the current through the inductor in DCM mode, based on the voltage across the diode during the conduction...
Applying RF circuit design techniques to dc-dc power conversion has pushed the switching frequency of power converters using discrete components beyond 100 MHz. This paper proposes a simple solution to implement synchronous rectification for resonant dc-dc power converters operating in the Very-High-Frequency (VHF) range, by using a symmetric bandpass matching network between the inverter and rectifier...
This study presents a sensorless static model based with output current estimation method for digital PWM control dc-dc converters. The static model is a feedforward type control method adopted in coordination with the standard PID control and it can improve characteristics of wide input and output range of dc-dc converter by using information of output current. The one of the drawbacks of the static...
The introduction in the semiconductor market of the SiC technology enables power designers the development of power converters with higher power density (W/m3) in comparison with the traditional converters based on Si power semiconductors. This work presents the redesign of a DC-DC converter, used in railway traction applications with full-SiC modules. The low current rating of the actual full-SiC...
The Class E dc-dc converter, operating with the switching frequency up to multi-megahertz, is usually regulated by the basic ON-OFF control. In this paper, it is found that in the basic ON-OFF control, the resonant inductor current of the Class E dc-dc converter will be increase with the rise of the input voltage, which will enhance the output capacity of the converter and also increase the ON-OFF...
Based on the battery charging and discharging regulator (BCDR) in spacecraft power conditioning unit application, a bidirectional DC-DC converter BCDR with high direction-changing frequency is proposed in this paper, including the Weinberg-buck bidirectional DC-DC topology and the corresponding bidirectional control. Additionally, the test on the BCDR prototype shows that BCDR parallel modules could...
This work presents the design of an autonomous, cost-effective and efficient solar powered irrigation pump using a switched reluctance motor (SRM) drive. The proposed system utilizes a modified CSC (Canonical Switching Cell) converter for power optimization of photovoltaic (PV) array. The continuous inductor current mode (CICM) working of DC-DC converter significantly minimizes the stresses on its...
Grid connected PV systems are the most popular solar electric system on the market today. The most important device in the grid-connected PV system is the inverter. This paper presents a survey on the grid connected PV inverters and the system topologies used for grid connected PV system. The review describes different two level inverter topologies as well as multilevel inverter topologies. Cascaded...
This paper presents comparison of GaN based switched-tank converter (STC) and traditional cascaded voltage divider (CVD) dc-dc converter for data center applications. The operation principle of two kinds of converters are presented. And simulations with Saber are both conducted to verify the proposed comparison, respectively. The system volume and efficiency are fully compared via GaN based device...
In this paper, a switched Z-source dc-dc converter (SZSC) is proposed for the conversion from a low voltage to a higher one in renewable energy systems. The voltage gain is increased by adding another one switch and diode to the output terminal of the traditional Z-source dc-dc converter. Not only does the output capacitor function as the filter capacitor; it is also connected in series into the inductors'...
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