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This paper introduces a soft-switched high-frequency-link inverter for grid-tied PV systems. This single-stage inverter can perform the step-up/down operation and also has the ability to effectively harvest the highest possible power from the PV array. The high-frequency link is formed by an ac inductor and a small ac capacitor without the use of bulky short-life electrolytic capacitors. The link...
Modular Multilevel Converter (MMC) is a promising topology for high voltage/power AC/DC and DC/AC applications. Model Predictive Control (MPC) is an advanced and simple method for power converters control. However, its computational load becomes unacceptable when MMC voltage level increases. An improved MPC for MMC is proposed in the paper. The submodule capacitor voltages are sorted according to...
This paper presents a new power conversion architecture for single-phase grid interface. The proposed architecture is suitable for realizing miniaturized ac-dc converters operating at high frequencies (HF, above 3 MHz) and high power factor, without the need for electrolytic capacitors. It comprises of a line-frequency rectifier, a stack of capacitors, a set of regulating converters, and a power combining...
Multi-level rectifier topologies are widely used in applications of the wide-power range. T-type topology, which is one of many three-level topologies, has an advantage in terms of an efficiency compared to a neutral-point clamped (NPC)-type. In applications using T-type rectifier topology, the interest in reliability has been increased recently. Therefore, a tolerance control for T-type rectifiers...
Electric vehicles provide portable energy storage that can be used in Vehicle-to-Grid (V2G) applications. In order to source power to the grid, the power electronics on-board these vehicles must be bidirectional. A single stage bidirectional isolated AC-DC converter is discussed. A modulation scheme for this topology is proposed to provide control of real and reactive power. A control scheme is coupled...
This paper proposes the use of the modular multilevel converter (MMC) for ac-dc conversion using medium frequency transformers in a two-stage topology with unidirectional switches. The losses analysis of the propose converter are presented with a comparative studyamong others two topology well know in the literature for traction applications. The basic description of the topology and some simulation...
In this paper, a comprehensive efficiency evaluation of several single-phase bridgeless Power Factor Correction (PFC) boost rectifier topologies is conducted. Both two-level and three-level bridgeless PFC boost rectifier topologies are considered; including paralleled and interleaved variants of each. To improve efficiency, a three-level bridgeless PFC boost rectifier with an AC switch is proposed...
In previous work, a novel design of a 2.5kW 400V-12V 93.2%-efficiency DC/DC converter with a triggering angle tracking synchronous rectifier was proposed for use in an electric vehicle to replace the electric alternator. This paper is focused on the further enhancement of the DC/DC converter to improve the system efficiency and wide-range input/output performance.
This paper introduces the Dual-Frequency Single-Inductor Multiple-Output (DF-SIMO) power converter topology as a cost-effective and power-efficient method for implementing a large number of on-chip power supplies (i.e. on-chip power grids) in nanometer CMOS System-on-Chip (SoCs). The proposed topology decouples the rate of energy conversion at the input of the converter from the rate of energy distribution...
A modular approach for DC/DC converters to obtain desired voltages and currents is presented in this paper. A high efficiency low switch count isolated push-pull DC/DC converter is used as a unit module. The converters are connected in input series or parallel and output series, or parallel configuration to meet the desired power level. The aim is to obtain a flexible DC/DC converter block which can...
A switching control strategy is proposed for current-fed half-bridge converters. An active switch based voltage doubler circuit at the secondary side of the isolation transformer is used to obtain zero-current-switching at turn-off and zero-voltage-switching at turn-on in the primary side switches of the current-fed half-bridge converter. The operation of the current-fed half-bridge converter with...
This paper proposes a DC-DC converter that can be used in battery equalization and charging and discharging applications. The proposed topology is a high frequency (≥ 5 MHz) resonant bidirectional SEPIC DC-DC converter. The resonant technology and high frequency operation will allow the size and cost of a battery equalizer to be reduced because of the ability to reduce the size of the magnetic components...
In this paper, an new configurable low-side resonant gate driver circuit based on 5V CMOS process is presented. This gate driver is designed for current Gallium Nitride (GaN) power transistor working up to 10 MHz switching frequency. By updating driving signals and removing off-chip resonant inductors, this gate driver can be working as a conventional non-resonant gate driver. Under resonant gate...
Datacenter power consumption makes up two percent of United States electricity consumption or 80TWhr. Roughly half of this energy is spent on cooling or lost in power conversion. Further as datacenters try to maximize compaction, the need for small and highly efficient power supplies is highlighted. Telecom power supplies often rely on large and lossy transformers to achieve large conversion ratios...
Switched-capacitor (SC) converters are becoming a strong candidate for high power density converters. Traditionally, these SC converters have suffered from two main problems: capacitor charge transfer loss and lossy output voltage regulation. This paper proposes a hybrid SC converter topology that addresses both problems simultaneously. The proposed topology adds a single small inductor to the SC...
A single-phase Dual Active Half Bridge (DAHB) DC-DC converter topology is evaluated for medium voltage (MV) application. A 15kV SiC-IGBT based three-level half-bridge is connected to the high voltage (HV) primary side of a high frequency (HF) transformer operating at 10kHz link-frequency. A 1200V SiC-MOSFET based two-level H-bridge is connected on the low voltage (LV) secondary side. This topology...
In this work it is presented a Current Source Converter (CSC) topology that helps to mitigate double line frequency power ripple (low frequency) effect. Low frequency power ripple presented in single-phase systems propagates through DC-bus converter. This low frequency ripple reduction allows to increase the power converter density by reducing the volume of the DC inductor, without lack of stiffness...
Power Electronic Transformer (PET) is one of the most prospective components for future power electronics based power distribution systems. In this paper, the issue of the series-connected voltage sharing and the parallel-connected current sharing of a three-stage H-bridge based PET is discussed. Based on the present overall control strategy and application, it finds that the output-stage parallel-connected...
This paper concentrates on the load disturbance in three-phase voltage source inverter with an output transformer. The transformer could be smaller when placed behind the LC filter. But the voltage drop on the leakage impedance of transformer may destroy the quality of output voltage. Output current feedforward control is proposed to eliminate the influence of load disturbance. The distinct features...
In order to reduce the total harmonic distortion (THD) of the line-to-line voltage and simplify the circuit structure, an advanced five-level modular multilevel-clamped composited multilevel converter (5L-M-MC2) is proposed [1]. A comprehensive analysis of the level degradation on carrier-based PWM modulation in the 5L-M-MC2 system is analyzed in detail in this paper. The line-to-line voltage levels...
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