Design of converters for leveraging 48V DC power line at homes / offices
01 Dec 2016-pp 1-5
TL;DR: In this paper, an efficient and cost effective DC-DC power converter for notebook computers is proposed, which employs a synchronous rectified step-down DC/DC converter IC BD9611MUV to yield 195V DC from 48V DC input.
Abstract: There has been enough traction in India to standardize 48V DC home / Office wiring for power, an ideal solution for running office devices and energy storages seeking to provide better efficiency and performance In addition, since most renewable sources provide direct current (DC) power and the batteries used for storing power also give DC power, it is easier to integrate these sources into DC power line The 48V DC power is stepped down to lower DC voltages (12–36V) with the help of converters to power the office and storage devices Once 48V DC is primary wiring, one would require converters to power lower voltage appliances like PCs (which take 19V) and laptops and also TVs (some of them take 12V) Besides once in a while one may have to connect some legacy equipment which takes only AC input The objective of this paper is to design an efficient and cost effective DC-DC power converter for notebook computers The converter employs a synchronous rectified step-down DC/DC converter IC BD9611MUV to yield 195V DC from 48V DC input The performance of developed power converter has been investigated under different input conditions and practical results have been reported in this paper Also, this paper shows that existing large AC appliances can be connected to 48V DC line with the help of Microinverter
Citations
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TL;DR: How typical building loads can benefit from DC input is identified, including bath fans, refrigerators, wall adapters, task lights, and zone lighting, and the development of several prototypes that demonstrate efficiency savings with DC are detailed.
35 citations
26 Sep 2021
TL;DR: In this article, the authors present the development of a mathematical model for AC and DC wiring systems which includes the total power losses in cables and converters, and the boundary conditions are developed to select an efficient wiring topology among the two systems for a house based on operating conditions such as power rating of load, size and length of conductors.
Abstract: DC-based appliances are exponentially increasing in the present market. This scenario opens the opportunity to utilize the DC electricity produced by the Photovoltaic (PV) panels directly without going through the conversion stages. Several research studies have been reported in the literature to experimentally test and compare few AC and DC wiring cases. There are thousands of possible wiring cases depending on the conductor length, conductor size and load power rating. Therefore, comparison through a mathematical model can be used to save extensive experimentation time and cost. However, there is no validated mathematical model to estimate the losses of all types of converters along with the power losses in cables. Moreover, there is boundary conditions chart that can help to choose an efficient wiring topology between AC and DC. This paper presents the development of a mathematical model for AC and DC wiring systems which includes the total power losses in cables and converters. This research is further supported by the validation of these models through experiments and simulations studies. In addition, the boundary conditions are developed to select an efficient wiring topology among AC and DC systems for a house based on the operating conditions such as power rating of load, size and length of conductors.
1 citations
20 May 2019
TL;DR: This work identifies how typical building loads can benefit from DC input, including bath fans, refrigerators, task lights, and zone lighting, and details the development of several prototypes that demonstrate efficiency savings with DC.
Abstract: Despite the recent interest in direct current (DC) power distribution in buildings, the market for DC-ready loads remains small. The existing DC loads in various products or research test beds are not always designed to efficiently leverage the benefits of DC. This work addresses a pressing need for a study into the development of efficient DC loads. In particular, it focuses on documenting and demonstrating how to best leverage a DC input to eliminate or improve conversion stages in a load's power converter. This work identifies how typical building loads can benefit from DC input, including bath fans, refrigerators, task lights, and zone lighting. It then details the development of several prototypes that demonstrate efficiency savings with DC. The most efficient direct-DC loads are explicitly designed for DC from the ground up, rather than from an AC modification.
1 citations
Cites background from "Design of converters for leveraging..."
...Recent research has produced DC prototypes in many end-use categories such as lighting [9], [17]–[21], motor loads [17], [19], [20], [22]–[24], electronics [17]–[20], [25], and induction cooking [18], [26]....
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21 Apr 2022
TL;DR: In this article , a symmetrical five-level DC-AC multi-level inverter (MLI) with double boost capability and a single DC input source based on a switching capacitor is described.
Abstract: This paper describes a new symmetrical five-level DC-AC multi-level inverter (MLI) with double boost capability and a single DC input source based on a switching capacitor. It can be employed in modern industrial applications with intermittent input sources like low voltage fuel cells, PV cells, etc. Two H-bridge inverters and an auxiliary bidirectional switch are used in the proposed multi-level output boost (MLBO) converter to provide symmetrical DC-link output voltage, which is then transformed into AC. The proposed topology's operation is demonstrated using a single five-level boost inverter, as well as the devised control method. The suggested MLBO is validated by simulating it in MATLAB/Simulink environment. The simulation results show the effectiveness of the proposed structure.
References
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TL;DR: A current-sourcing switch-mode power supply topology is developed by applying a duality principle to a voltage-sourced half-bridge converter that has boost converter characteristics and is suited to low-voltage high-current input applications.
Abstract: A current-sourced switch-mode power supply topology is developed by applying a duality principle to a voltage-sourced half-bridge converter. The converter has boost converter characteristics and is suited to low-voltage high-current input applications. It is shown to compare favorably with the center-tapped transformer converter. Two optional enhancements-nondissipative snubber networks and inductor clamping windings-are also examined. Some results obtained with a low-power prototype are presented. >
241 citations
"Design of converters for leveraging..." refers methods in this paper
...The Circuit used in DC to DC stage is of Interleaved Boost Converter [5][4] which boosts the output voltage to 400V DC from a 48V input DC....
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07 Jun 2015
TL;DR: In this article, an efficient and affordable solar DC solution for powering off-grid homes is presented. But, the proposed solution is not suitable for the use of the generated PV power efficiently.
Abstract: India is a power deficit country and one third of its homes are off grid or near off grid. This paper presents an efficient and affordable Solar DC solution for powering such homes. Though several solutions have emerged in the past for powering these homes, those have been expensive and energy inefficient. These solutions rely on several DC to AC and AC to DC conversions, to feed the widely used AC home loads, thus, wasting a large chunk of the expensive power. The proposed Solar DC solution for off-grid homes (OGH) is developed to use the generated PV power efficiently. With this solution, the panel and battery size is reduced by 2 to 2.5 times and the cost to power a house is reduced to nearly half the cost of the existing solutions. The paper also presents a techno-economic comparison between the proposed OGH solution with some existing solar systems.
43 citations
"Design of converters for leveraging..." refers background in this paper
...Linking the DC power Sources directly with DC loads, notably reduces the power losses and makes it significantly cheaper [3]....
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01 Nov 2013
TL;DR: An isolated dual-input DC-DC converter with a PWM plus phase-shift control for fuel cell hybrid energy systems and the principle of operation is analyzed, some design considerations are discussed, and simulation results using PLECS are given to verify the proposed analysis and design.
Abstract: This paper presents an isolated dual-input DC-DC converter with a PWM plus phase-shift control for fuel cell hybrid energy systems. The power switches are controlled by phase shifted PWM signals with a variable duty cycle, and thus the two input voltages as well as the output voltage can be regulated effectively. By using the second input capacitor and the high side switches as an inherent active clamping circuit, zero-voltage switching (ZVS) for the power MOSFETs on the primary side, and zero-current switching (ZCS) for the diodes on the secondary side are achieved respectively to improve the performance of the proposed PWM converter. The principle of operation is analyzed and some design considerations are discussed. Simulation results using PLECS are given to verify the proposed analysis and design. An experimental converter prototype has been designed, constructed and tested in the laboratory to verify the validity of the theoretical analysis and also demonstrate the converter's performance over wide variations in input voltage.
6 citations
"Design of converters for leveraging..." refers background in this paper
...The Circuit used in DC to DC stage is of Interleaved Boost Converter [5][4] which boosts the output voltage to 400V DC from a 48V input DC....
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...This stage of DC to DC Interleaved Boost Converter [7] needs high efficiency and also a high output voltage....
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