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This paper presents a control approach for a current driven Dual Active Bridge (DAB) converter used as an interface to transfer power between the grid and Electric Vehicles (EVs). The wide range of input voltage and load variation makes it very challenging to have a fast control response of power flow between the two dc buses. This control system adaptively regulates the frequency and the phase shift...
This paper presents a random frequency hopping with triangular ramp control for harmonic reductions in a dc-dc converter. The relationship between “the sawtooth and triangular ramp signals” and the inductor current is analyzed, and the two ramp signals are implemented into the converter to compare the variation of output voltage. When the switching frequency hops, using triangular ramp keeps the small...
Droop Control has been a well-established control technique both in AC and DC power distribution grids for many years, because it provides a simple way to equally distribute the load current between remote power sources. With the increasing demand for low voltage DC microgrids supplying high-reliability equipment, like servers in data centers, to work both grid-tied and autonomously without a connection...
Three phase PFC rectifier followed by a DC-DC isolated converter has been the industry workhorse for conversion of three phase AC to isolated DC output used for high power (> 3kW) telecom loads. In this paper a reduced device count nine-switch converter topology which integrates the two stages of a conventional three phase AC-DC power supply with an isolated DC output voltage for telecom applications...
DC 380 V power supply has begun to be used for data centers to save energy and supply high quality power. This paper describes dc capacitor voltage regulation of ac-dc converter using Modular Multilevel Cascade Converters based on Single-Star Bridge-Cells (MMCC-SSBC) without line frequency transformer. The proposed voltage regulation method compares each dc capacitor voltage with the reference value...
The authors have proposed the single-stage bidirectional buck AC/DC converter. This paper shows the size and efficiency of the proposed single-stage buck AC/DC converter using SiC MOSFET in comparison with conventional two-stage buck AC/DC converter using Si IGBT. AC current harmonics, DC voltage ripples and efficiency are evaluated in single-stage converter and two-stage converter by experiments.
The comparison of the power stage dynamics between a conventional LLC converter and a three-level LLC converter is presented in this paper. The frequency response was similar in continuous current mode, but different in discontinuous current mode. Moreover, how the variation of circuit parameters affects the transfer function of the three-level LLC converter is studied. The experimental verification...
In this paper, a new AC-DC single stage three-level resonant converter has been proposed for high voltage DC distribution system of datacenters applications. This converter convert universal input voltage range (90–265Vrms) to 380VDC with high power factor. The proposed topology integrates a bridgeless boost converter and a half-bridge three level resonant converter. Voltage stresses on the switches...
With the growth of telecommunication systems in remote areas, demand of wind solar hybrid systems is demanding in this industry. In this paper a 3 MHz DC-DC converter for standalone wind/solar application is proposed. The proposed converter is able to operate at a high frequency and to function in a wide range of input voltage. These specs make the system ideal for wind/solar energy systems. All MOSFETs...
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