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The fundamental building block of cascaded static synchronous compensator used in distribution grid is H-bridge based converter module. In this paper a type of "plug and play" module was introduced to improve the device compensation performance and reliability. The module based on IGBT parallel connection was discussed about the design of electrical parameters and physical structure. In...
Differential power processing (DPP) is a power electronics system architecture that configures DC-DC converters in parallel with the PV string to improve its power yield. The parallel nature of the DPP architecture brings a number of benefits such as low converter power rating and low power losses, all of which make DPP especially suitable for sub-module level maximum power point tracking (MPPT)...
Nonlinear inductors have wide applications in DC/DC converters. The multi-hole multi-permeability nonlinear inductors have been proved to have gradually changing wide-range inductance curve while requiring no extra DC bias, which makes them suitable in various high efficiency DC/DC converters. This paper focuses on the design of such a multi-hole multi-permeability inductor. In the conventional design,...
This paper presents an online multivariable auto-tuning digital controller for DC-DC switching power converters. In the proposed scheme, all the variables/parameters (i.e. gain, zero(s) and pole(s)) of a digital PID compensator are auto-tuned simultaneously during system operation in order to achieve an optimized compensator that results in improved dynamic performance for a given power converter...
This paper presents the output current balancing method for three-phase interleaved full-bridge LLC resonant converter which employs a Y-connected rectifier. The proposed Y-connected rectifier is capable of boosting the output voltage without increasing the transformer's turn ratio. Especially, the frequency of the output ripple of the rectifier is six times higher than the switching frequency, thereby...
This paper presents a novel control method for wireless power transmission (WPT). The proposed method can maximize the power efficiency only by controlling the voltage ratio between the primary and the secondary side. Experimental measurement results of the prototype system with 3 kW power transmission show the efficiency difference between the proposed control method and the available maximum value...
This paper introduces a new battery management system for portable electronics applications based on the flyback converter. This new architecture integrates the voltage step-up and balancing functions inside a single converter. The step-up function is obtained using an assisting concept, where the flyback output is placed at the top of the battery pack and is therefore only processing a portion of...
Inductive Power Transfer (IPT) is a promising technology for the charging of the traction batteries of electric and hybrid electric vehicles due to the significant simplification of the charging process implied by the contactless transmission of the charging energy. Typically, Finite-Element (FE) methods are used to predict the power loss in the IPT coils, to calculate equivalent circuit parameters,...
This paper introduces a flyback-based low-volume modular converter and complementary mixed-signal controller that provide input voltage and output current sharing as well as near optimal transient response. This serial-input paralleloutput switch-mode power supply (SMPS) is well suited for high-step down ratio applications where, compared to a conventionally used multi-phase buck, it requires a smaller...
The paper proposes a novel push-pull forward converter (PPFC) in which a passive resonant network is introduced in the secondary winding. The converter can effectively overcome the drawbacks of the conventional PPFC, such as the high voltage stress over rectifying diodes and high voltage overshoots of switches. Furthermore, efficiency of the converter can be improved. Operating principles and features...
The integrated gate commutated thyristor (IGCT) and the press-pack power diodes are successfully applied in medium-voltage Neutral Point Clamped (NPC) converters in the power range from hundreds of kW to tenth of MW. Responsible for driving key processes in various industries, the requirements of reliability and high availability of these converters are absolutely relevant, since its repair or replacement...
Incident solar power on a PV panel is highly variable due its dependence on weather, time of the day and shading which forces the micro-inverter to operate at light loads for a significant period of its operation time. Poor light load efficiency of power converters further reduces the effective power available. This paper proposes a control technique — Phase Skipping Control, to improve light load...
Presented herein is Uniform Input Voltage Distribution (UIVD) control [6–9] for Distributed-Input Series-Output (DISO) converter power systems. UIVD for DISO converters is implemented to primarily achieve grouped maximum power throughput from non-identical power sources. This paper also offers a revised Maximum Power Tracking (MPT) controller [11] that facilitates simultaneous processing of distributed...
High energy density high-voltage metallized film capacitor is one of the most suitable energy storage elements in pulsed power system, such as Electromagnetic Gun (EMG) system. But the voltage drop at high voltage is an inherent problem of metallized film capacitor, which will affect the launching precision of EMG system. To improve the launching precision, this paper mainly focuses on the voltage...
With computers and servers becoming increasingly widespread, a growing amount of public attention has been focused on improving the efficiency of the server power supply. In this paper, the high-voltage bus converter in the present architecture of the server power supplies is replaced by the multiple output converter to improve the efficiency as there are a variety of loads. Aimed at improving the...
Dielectric Elastomer (DE) transducers have emerged as a very interesting alternative to the traditional electrodynamic transducer. Lightweight, small size and high maneuverability are some of the key features of the DE transducer. An amplifier for the DE transducer suitable for audio applications is proposed and analyzed. The amplifier addresses the issue of a high impedance load, ensuring a linear...
This paper presents an AC-powered LED driver circuit that can drive multiple strings of LEDs with uniform brightness. The circuit basically has a two-stage topology in which the first-stage boost converter performs the power-factor correction (PFC) and the second-stage buck converter distributes equal DC currents to multiple LED channels using only a single inductor. The uniform current level, hence...
The energy efficiency of typical data centers is less than 50% because more than half of the power is consumed during power conversion, distribution, cooling, etc. In this paper, a combination of two approaches to improve power supply efficiency is implemented and experimentally verified. One approach uses a high voltage DC architecture, designed to reduce distribution loss and remove unnecessary...
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