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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...
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...
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...
Point-of-load (POL) power supplies contribute significantly to the overall volume, weight, and cost of many electronic devices. This is mainly due to the fairly large inductor of the buck converter commonly used in these applications, which causes it to have a relatively low power density. The goal of this paper is to propose an alternative converter for POL applications which uses a much smaller...
A high-efficiency high-energy-density buffer architecture is proposed for power pulsation decoupling in power conversion between DC and single phase AC. We present an active decoupling solution that yields improved efficiency and reduced circuit complexity compared to existing solutions. By connecting a buffer converter in series with the main decoupling capacitor, the main capacitor is allowed larger...
This paper discusses a circuit configuration for a single-phase current source inverter that features power decoupling capability. This converter consists of a resonant type isolated DC/DC converter, power decoupling circuit, and a current source inverter (CSI). The proposed converter can be achieved the low input voltage ripple without a large smoothing inductor or electrolytic capacitor. In this...
This paper presents an interleaved totem-pole bridgeless power factor correction (PFC) rectifier which consists of a coupled inductor and two interleaved bridge arms. The core utilization and power density are improved with the use of coupled inductor. However, it also introduces a serious diode reverse-recovery problem and increases the turn-on loss obviously due to the poor parasitic body diode...
"Direct Adaptive Current Control" (DACC) is a completely adaptive current control scheme with excellent control quality and high dynamics. It is based on the detection of the current slopes during each switching state of the utilized inverter and identifies the system within one period. No control path parameters are needed for setup. One method to measure the current slopes is fast oversampling...
Small-signal characteristics of synchronous Buck DC-DC converters under light load conditions are analyzed in this paper. Results of the analysis show that similar to non-synchronous Buck converters operating in discontinuous conduction mode, the double pole of the converter control-to-output voltage transfer function can be split into two real poles under certain conditions. The mechanism of such...
In hard switching boost-type or buck-type three-phase power factor corrected rectifier systems the turn-on losses in continuous conduction mode (CCM) are usually higher than the turn-off losses. This is mainly caused by the reverse recovery effect of the freewheeling diode. The reverse recovery related turn-on losses however may be eliminated if the converter is operated in boundary conduction mode...
This paper presents a comparative study of direct power control (DPC) and model predictive control (MPC) for three-level neutral-point-clamped (NPC) AC/DC converters. The operating principle of DPC and MPC are introduced in detail, with focus on vector selection mechanism and suppression of neutral point voltage fluctuation. Special care is given to the avoidance of high voltage jumps in both phase...
This paper presents two discontinuous pulse width modulation (DPWM) methods for three phase Vienna rectifiers with different performance optimization targets. One for switching loss minimization and one for switching loss reduction with the neutral point voltage controllability. Due to the current commutation characteristics if Vienna rectifiers, the available space voltage vectors are limited. With...
This work presents detailed analysis for the Common Mode Voltage (CMV) in a two stages cascaded gradient driver system. The vector modulation method is proposed to eliminate or reduce the CM voltage in a cascaded system without a neutral or ground point. The method is demonstrated through two stages example but can be extended to topology with more stages in cascaded. Meanwhile, the power stage output...
Search algorithms that reduce the time to solve the direct model predictive control (MPC) problem are proposed in this paper. By allowing for suboptimal solutions, the computational complexity of the underlying optimization problem can be significantly reduced, albeit by sacrificing (to a certain degree) optimality. Two approaches are presented and discussed. The first approach requires quadratic...
The rapid maturation of GaN power transistors continues to enable new capabilities in high frequency power conversion. In this paper we will evaluate one of the latest technological advancements in eGaN® FETs, monolithic integration. The benefits of monolithic integration for GaN power transistors with regards to parasitic reduction, die size optimization, and thermal performance will be discussed...
GaN heterojunction field-effect transistors (HFETs) in the 600-V class are relatively new in commercial power electronics. The GaN Systems GS66508 is the first commercially available 650-V enhancement-mode device. Static and dynamic testing has been performed across the full current, voltage, and temperature range to enable GaN-based converter design using this new device. A curve tracer was used...
The transformerless grid-connected PV system suffers from leakage current and neutral voltage imbalance if three-level inverters are utilized. This paper first investigates the common-mode voltage (CM voltage) reduction/elimination methods in three-phase PV inverters, especially three-level inverters. Several mainstream common-mode voltage reduction/elimination methods, including AZSPWM, 2MV1Z, 3MV,...
Integration of functions and features into silicon circuits is very important for a new power circuit design in order to reduce the electronic bill of material's (eBOM) cost and component count. These eBOM reductions increase the reliability and decrease the cost and size of a product. A low cost power micro-inverter using two application specific integrated circuits, analog power manager (APM) and...
An effective output voltage regulation method using harmonic burst mode control strategy is presented. By using this strategy, the operating performance of the full-bridge series resonant dc-dc converter (SRC) applied to electric vehicle (EV) battery charging is improved. The proposed control strategy not only performs load regulation, but it also achieves soft switch both at turn-on and turn-off...
This paper proposes a modulation scheme for a dual-active-bridge (DAB) converter to reduce current conduction in wide-range operating conditions. The operating principle of the proposed fundamental duty modulation (FDM) is formulated based on the fundamental component analysis (FCA) of the DAB converter. By modulating the PWM signals in the fundamental component domain, the circulating current can...
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