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This paper analyzes the behavior of a pure capacitive output filter in parallel and series-parallel resonant converters. Unlike traditional resonant voltage-and current-driven rectifiers, pure capacitive output filters present interruptions in power transfer from the transformer primary to the secondary, owing to the existence of a parallel resonant capacitor. Therefore, existing formulas for different...
Many industrial applications involve loads which are very sensitive to electrical disturbances in the supply. These instances involve both various types of voltage unbalance as well as more series disturbances such as symmetrical and asymmetrical faults. This paper proposes a voltage unbalance and an unsymmetrical fault correction technique for a three phase load utilizing an industry-standard current...
This paper develops a three-phase front-end power conversion stage for data center power supplies based on 400 Vdc power delivery architecture, which has been proven to have higher efficiency than traditional AC architectures. The front-end stage is based on three paralleled three-phase current source rectifiers, which have several benefits for this application. A control method is introduced for...
Isolated half-bridge gate drivers are used in a variety of applications that range from motor drives to isolated power supplies. However, providing isolated, adequate and well-timed half-bridge gate drive signals in these applications presents its own set of challenges. This paper presents an isolated half-bridge gate driver which supports 4.5V to 18V gate drive voltages. The gate drive outputs can...
Electric Vehicles (EVs) are quickly gaining widespread interest as attractive alternatives to conventional petrol driven vehicles. If EVs can derive some or all of their electrical power from renewable sources, then they can significantly help to reduce global dependence on fossil fuels for transportation. Inductive power transfer (IPT) is a method that can transfer power to EVs over an air-gap without...
Dynamic powering of in-motion Electric Vehicles (EV) using Inductive Power Transfer (IPT) can potentially solve many of the problems currently faced by EVs: in particular range, cost and charging rate. However there is currently limited research focused on suitable IPT primary supply-side infrastructure for such roadway IPT systems, and most proposed systems so far have limitations which affect their...
In this paper, an new configurable low-side resonant gate driver circuit based on 5V CMOS process is presented. This gate driver is designed for current Gallium Nitride (GaN) power transistor working up to 10 MHz switching frequency. By updating driving signals and removing off-chip resonant inductors, this gate driver can be working as a conventional non-resonant gate driver. Under resonant gate...
The paper proposes a single end Flyback design with Silicon Carbide (SiC) based 1700V MOSFET to replace conventional two-switch Flyback converter. An active start-up circuit with 1700V SiC MOSFET is implemented to optimize the converter design with wide input voltage from 200Vdc to 1000Vdc and lower power losses. A 60W auxiliary power supply is developed to demonstrate higher performance and less...
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...
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...
With the development of smart grid, a large amount of monitor equipment is employed to supervise the condition of power cable. Because of its convenience, extracting electric energy from cable via a current transformer is a promising technique used in power supply for these pieces of monitoring equipment. In this paper, an enhanced energy harvesting method based on current transformer in resonant...
Energy efficiency of typical data centers is less than 50% where more than half of the power is consumed during power conversion, distribution, cooling, etc. In this paper, a single power stage architecture that converts 400 V to 1 V directly targeting high system efficiency is proposed. A phase shift full bridge (PSFB) DC/DC converter based input series and output parallel structure (ISOP) is selected...
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