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The paper proposes a current source based Dynamic VAR Compensator (DVC) control strategy. The switching unit in this DVC topology is composed of series connected switch and diode also termed as the “current switch”. The proposed controller has been designed to force discontinuous conduction mode operation thus fundamentally different from the traditional constant current source based control system...
The paper presents an improved control strategy for Dynamic Current (Dyna-C) Converter. Dyna-C is a bidirectional current-source based AC/AC converter for Solid State Transformer (SST) application. The proposed controller facilitates discontinuous mode operation which leads to zero current turn on and turn off. A non-linear average phase charge based controller is presented which ensures zero harmonic...
This paper proposes a new current-ripple-based control strategy for the Series Ripple Cancellation Converter (Series RCC), which eliminates LED light flicker caused by Power Factor Correction (PFC) stage and significantly reduces its output capacitance. Instead of sensing two differential output voltage signals as in existing voltage-ripple-based control strategy, the proposed current-ripple-based...
Several maximum power point tracking (MPPT) methods have been proposed to optimize the energy harvesting of photovoltaic systems. However, the optimization of the energy harvesting can produce extremely variable loading of the power semiconductors resulting in a decrease of the system lifetime. This work proposes a multi-objective MPPT for two-stage photovoltaic converters, where the semiconductor...
The conversion between DC and AC power will typically introduce a low-frequency pulsation power in the DC side of single phase power converter which may create instability, lowers its efficiency, and reduces the reliability. In this paper, a novel Power Decoupling Modular (PDM) with 2 series differential decoupling capacitors at the ac side is proposed. Compared with the DC PDM, the proposed modular...
In computer and telecommunication power supplies, the front end DC-DC stage is required to operate with a wide input voltage range to provide hold up time when AC voltage fails. Conventional LLC converter serving as the DC-DC stage is not suitable for this task, as the normal operation efficiency at 400Vin will be penalized once the converter is designed to achieve high peak gain, i.e. the wide input...
This paper presents a Switched Reluctance Motor (SRM) capable of running up to 50,000rpm whilst producing an output power of 60kW. The high speed operation allows for a smaller overall size, which in turn leads to lower manufacturing costs. It is demonstrated that, at very high speeds, merely shrinking the motor is not enough and certain mechanical considerations should be taken into account. A rotor...
This paper proposes Series Input Parallel Output (SIPO) interleaved Active Clump Forward (ACF) converter with novel integrated magnetic components that may achieve high power density. The proposed converter consists of two ACF converters in SIPO connection to share the input voltage and output current. The natural magnetizing reset can be realized by the active clump circuit. The SIPO connection distributes...
Permanent-magnet synchronous machines (PMSMs) are considered a very promising machine type for high-speed applications nowadays. As permanent-magnet (PM) materials are generally fragile, a high strength sleeve is required to protect the PMs from damage due to extreme centrifugal forces. The rotor sleeve occupies space of the effective air gap of the PMSMs, so it is difficult to perform the electromagnetic...
Among high-power pulse-width modulation (PWM) current-source motor drives, the transformerless structure using the integrated dc choke has been widely acknowledged with superior advantages. A typical challenge faced by such transformerless PWM current-source drive systems is the potential common-mode resonance excited by the common-mode voltage (CMV). Since the implementation of power factor compensation...
A novel interleaved flyback converter with leakage energy recycled is proposed. The proposed converter is combined with dual-switch dual-transformer flyback topology. Two clamping diodes are used to reduce the voltage stress on power switches to the input voltage level and also to recycle leakage inductance energy to the input voltage and capacitor. Besides, the interleaved control is implemented...
This paper proposes a novel non-isolated high step-up converter suitable for miniaturization by high frequency design. High step-up converters with voltage multipliers are promising for high frequency design because many of them can be free from coupled inductors or transformers, which may lower the voltage gain due to the leakage inductance or may cause significant AC conduction loss in the primary...
A novel transformerless DC/DC converter is proposed in this paper to meet the high step-up, high efficiency and high power requirements. In the proposed converter, the dual switches structure is introduced to reduced the voltage and current stress of the power switches; the active clamping technology is utilized to realize the ZVS switching of all the switches; all the windings are coupled to simplify...
Nowadays there has been an important increase of electric equipment in modern aircraft which leads to a rising demand of electrical power. This highlights the necessity of efficient, reliable and high energy density power converters which rectify three-phase 115V ac to 270V dc for power distribution. This paper presents an isolated single-stage PWM rectifier with the integration of a current injection...
In this paper, we present the design and fabrication of a high density laptop adapter with a Clamped Series Resonant Converter (CSRC), as a possible alternative to traditional Flyback converters for power adapters in portable electronics. The target is to design for universal AC input up to a power of 100 W with power density of 6–7 W/in3. The converter is frequency controlled, and all switches exhibit...
An experimental 30 kW boost composite converter is described in this paper. The composite converter architecture, which consists of a buck module, a boost module, and a dual active bridge module that operates as a DC transformer (DCX), leads to substantial reductions in losses at partial power points, and to significant improvements in weighted efficiency in applications that require wide variations...
Transformer based Z-source (trans-Z-source) inverters are recently proposed by extending the traditional Z-source inverter with higher buck-boost capability as well as reducing the passive components at the same time. This research work proposes a new topology for high-boost trans-Z-source inverter. In traditional trans-Z-source inverters for high boosting voltage, low modulation index is required,...
A novel hybrid converter with two full-bridge at primary side and hybrid combination of rectifier diodes at secondary side is proposed. The rectifier output voltage is synthesized of two controlled transformer output voltages all the time, which is significantly improved to achieve reduced output filter size and rectifier diodes voltage stresses. Besides, the circulating current decays to zero in...
With the rapid development of large scale renewable energy sources and HVDC grid, it is a promising option to connect the renewable energy sources to the HVDC grid with pure DC system, in which high-power high-voltage step-up DC-DC converters are the key equipment to transmit the electrical energy. This paper proposes a resonant converter which is suitable for grid-connected renewable energy sources...
This paper proposes a novel central capacitor partial power processing (CCPPP) DC/DC converter, which can be used to boost dual input sources to a desired output voltage with reduced semiconductor voltage stress and current stress. Compared to the traditional DC/DC boost converter, the proposed circuit reduces both voltage and current stresses for switches and diodes but could maintain the same operation...
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