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An input filter is usually required in a power supply system in order to comply with regulations, reduce EMI, and ensure that input transients are properly handled. In systems with a single input power supply and multiple output converters, the phase positioning of the converters affects the input current/voltage ripple as well as the magnitude of the input harmonics. Optimizing the phase positioning...
A PWM or quasi-square-wave (QSW) zero-voltage-switching (ZVS) non-isolated boost converter using enhancement-mode GaN (eGaN) FETs is reported in this paper. The new converter topology requires small number of passive components, minimizes the converter switching loss under high-voltage high-frequency operations, and offers low-voltage stress across power transistors. A transformer-based floating gate...
This paper presents double-sided nickel-tin transient liquid phase (Ni-Sn TLP) bonding technology and its application to double-sided cooling structures used in automotive power modules. Double-sided cooling is an emerging solution for heat dissipation problems inside compact power modules (used in electrified vehicles) and requires components providing highlevel reliability. This requirement is satisfied...
Variable speed drives (VSD) constructed with doubly-fed machines (DFM) offer interesting flexibility for power electronic drive design. They also offer opportunities for controlling interactions with an ac grid. Design options are most flexible for the VSD DFM when the machine stator can be operated from an ac or dc source, selected “on-the-fly” as appropriate. This paper presents a SCR-based transfer...
In this paper, an improved control loop based on feedforward is proposed to reduce the total harmonic distortion of the input current (THDi), realizing power factor correction (PFC) in MCM. The frequency responses of the input impedance for a wide frequency range are improved and unified by adding feedforward duty-ratio to the output of the original current-loop. A 5 kW experimental prototype is built...
Integration of multi-converter systems into information-embedded power system infrastructures has been necessitated by the increasing popularity of microgrids, renewable energy systems and DC distribution systems. This work is motivated by the need for an autonomous simulation tool to perform system-wide analysis of static and dynamic behavior of multi-converter systems taking into account the underlying...
A quasi resonant topology suitable for LED drivers, featuring power factor correction and dimming in a single stage is presented. It contains a single active switch, and operates in zero-voltage-switching, zero-current-switching. This topology includes neither electrolytic capacitors nor transformer, and provides galvanic isolation between the AC mains and the DC side. Building on this new topology,...
Ultracapacitors have been supplied as main power in urban rail vehicle due to their characteristic of high efficiency. Given the model complexity and hard constraints of the ultracapacitors, the charging current control of ultracapacitors under this condition is challenging as fast charging is required. In this paper, an on-line fast model predictive control is proposed to address the problem based...
This paper proposes a new phase shedding scheme for interleaved Boost PFC converter to improve the light load efficiency. In the proposed scheme, the power level in the slave channels is reduced linearly as the output loading drops for optimization of light load efficiency. The new scheme also prevents the PFC slaves from switching between the ON and OFF states immediately after phase shedding, thereby...
Sneak circuit in power electronic circuit is a newly discovered phenomenon. Analysis of sneak circuit is essential for power electronics converter because of its unpredictable feature and various influences. Sneak circuit phenomenon is found in the Boost converter which takes parasitic parameters into consideration and the major exciting conditions are discussed in this paper. The effects of sneak...
This paper presents efficiency and cost models of power electronic converters based on converter ratings and datasheet information. These models aid in creating rapid prototypes which facilitate the component selection process. Through this rapid prototyping, users can estimate efficiency and cost which are essential in design decisions. The proposed approach treats main power electronic components...
This paper presents a single-input dual-output (SIDO) converter with the simple structure which easily implements zero-voltage-switching (ZVS). In the power transmission mode, a case may appear that one output port of this SIDO converter is idling while another output port is working normally. In this paper, the bad effect of dead-time on achieving the idling output port is detailed analyzed, simulated...
This paper introduces a new extended averaging method for switching power converters. By extending the conventional averaging techniques, this method is capable of modeling power converters with multiple switching frequencies. Using this method, a model for a cascaded dc-dc converter is derived. Comparison between the model and the non-averaged system is performed. Experimental verifications are provided...
This paper introduces a distributed battery equalization structure for battery strings in which power electronic converters are integrated on battery cells. Because each cell is managed individually, the proposed structure has many advantages over traditional ones. Design issues about power converters are discussed. A two-level control algorithm is proposed to perform global and local functions including...
One important challenge in power electronics design is removing the heat cost effectively from the power devices mounted on thermal vias on a printed circuited board (PCB). Thermal vias is a cluster of small diameter hole plated with copper and is used to transfer the heat from one side of the PCB where the power device is soldered to the other side which is generally mounted on a heat sink using...
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