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Showing 1 to 20 of 21 for “"Front-end converter"”.
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Investigation of High Performance AC/DC Front-End Converter with Digital Control for Server Applications
… hand, power density is still a big challenge for front-end AC/DC converters. For DPS systems, front-end AC/DC converters are under the pressure of continuous increasing power density requirement. Although increasing switching frequency can dramatically reduce the passive component size, its …
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Design and Implementation of High Efficiency, High Power Density Front-End Converter for High Voltage Capacitor Charger
… superconducting inductive device through a dc-dc converter. Then, when a discharging signal exists, the stored energy is released to the load through pulse forming network (PFN) generating high peak power pulse up to gigawatts within several tens of or hundreds of microseconds. The pulse power …
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Investigation of Control Concepts for High-Speed Induction Machine Drives and Grid Side Pulse-Width Modulation Voltage Source Converters
Control of a low voltage ac/dc/ac converter for high-speed induction machine drive applications has been investigated. Such a configuration can be applied, for example, in microturbines and high-speed spindles. Scalar control is usually applied for the control of high-speed drives especially in the …
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Investigation of High-density Integrated Solution for AC/DC Conversion of a Distributed Power System
… volume. As the key component of DPS system, front-end AC/DC converter is under the pressure of continuously increasing power density. For conventional industry practices, some limitations prevents front-end converter meeting the power density requirement. In this dissertation, different …
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Three-Phase Power Factor Correction Circuits for Low-Cost Distributed Power Systems
Front-end converters with power factor correction (PFC) capability are widely used in distributed power systems (DPSs). Most of the front-end converters are implemented using a two-stage approach, which consists of a PFC stage followed by a DC/DC converter. The purpose of the front-end converter is …
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Current Sharing Method for DC-DC Transformers
An ever present trend in the power conversion industry is to get higher performance at a lower cost. In a computer server system, the front-end converter, supplying the load subsystems, is typically a multiple output power supply. The power supply unit is custom designed and its output voltages are …
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Novel DC/DC Converters For High-Power Distributed Power Systems
… density with high efficiency. In the traditional front-end converter based on the two-stage approach for high-power three-phase DPSs, the DC-link voltage coming from the power factor correction (PFC) stage penalizes the second-stage DC/DC converter. This DC/DC converter not only has to meet the …
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High Efficiency Optimization of LLC Resonant Converter for Wide Load Range
… and 75% to 83% for desktop derived servers, depending on loading condition and server type. Furthermore, recently some industry companies came out with a much higher efficiency target for the whole AC/DC front-end converter over a wide load range. Distributed power systems are widely adopted in …
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A Three-Phase Single-Stage AC-DC ZVZCS PWM Full-Bridge Converter
It is standard practice to use two separate power converters to convert an ac input voltage to a desired and isolated dc output voltage. A front-end ac-dc converter is used to convert the input ac voltage into an intermediate dc voltage which is then fed into a dc-dc converter with transformer …
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A Three-Phase Single-Stage AC-DC ZVZCS PWM Full-Bridge Converter
It is standard practice to use two separate power converters to convert an ac input voltage to a desired and isolated dc output voltage. A front-end ac-dc converter is used to convert the input ac voltage into an intermediate dc voltage which is then fed into a dc-dc converter with transformer …
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New Techniques in the Design of Distributed Power Systems
… of the design of the distributed power system's front-end converter is investigated from the perspective of simplifying the conversion process while simultaneously improving efficiency. This is initially accomplished by simplifying the second-stage DC/DC converter in the standard two-stage …
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Transformer Shielding Technique for Common Mode Noise Reduction in Switch Mode Power Supplies
… will cause severe EMI noise issue. In a typical front-end converter, the EMI filter usually occupies 1/3 to 1/4 volume of total converter. Hence, reducing the EMI noise of power converter can help reduce the volume of EMI filter and improving the total power density of the converter. For off-line …
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Form-Factor-Constrained, High Power Density, Extreme Efficiency and Modular Power Converters
Enhancing performance of power electronics converters has always been an interesting topic in the power electronics community. Over the years, researchers and engineers are developing new high performance component, novel converter topologies, smart control methods and optimal design procedures to …
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Comprehensive loss optimization of induction motor drives
… method, the link voltage is varied using a front-end dc-dc buck converter according to a loss minimization algorithm. The effect of additional loss from the front-end converter on the total loss is also studied. Benefits of the proposed methods are verified by simulations and experiments.
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Conducted EMI Noise Prediction and Filter Design Optimization
Power factor correction (PFC) converter is a species of switching mode power supply (SMPS) which is widely used in offline frond-end converter for the distributed power systems to reduce the grid harmonic distortion. With the fast development of information technology and multi-media systems, high …
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EMI Noise Reduction Techniques for High Frequency Power Converters
… will cause severe EMI noise issue. In a typical front-end converter, the EMI filter usually occupies 1/3 to 1/4 volume of total converter. Hence, reducing the EMI noise of power converter can help reduce the volume of EMI filter and improving the total power density of the converter. The EMI …
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GaN-Based High-Efficiency, High-Density, High-Frequency Battery Charger for Plug-in Hybrid Electric Vehicle
… measurement results of a 500 kHz GaN-based boost converter. Topology selection is conducted to identify candidates for the PHEV charger application. Popular topologies are reviewed, including non-isolated and isolated solutions, and single-stage and two-stage solutions. Since the isolated …
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Low Voltage Ride-Through for Indirect Matrix Converter Based Open-End Winding Drives
… AC/AC drives have been dominated by converters using large capacitors with DC bus viz. back-to-back converters. These converters are becoming more reliable and have been tested with new advancements in the industry. In addition, the DC bus capacitor provides an inbuilt energy storage …
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Equivalent Circuit Model of High Frequency PWM and Resonant Converters
… control are widely used as point-of-load (POL) converters and voltage regulators (VR) in DPS systems. Series resonant converters (SRC) are widely used in aerospace systems and LLC resonant converters are widely used as Front-end converters in DPS systems. The technological innovations bring …
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Three Dimensional Passive Integrated Electronic Ballast for Low Wattage HID Lamps
… long life, compact size and good color rendition [2-4]. However, HID lamps require a well-designed ballast to stabilize the negative VI characteristics. A so-called ignitor is also needed to provide high voltage to initiate the gas discharge. Stringent input harmonic current limits, such …
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