scholarly journals Methods of ensuring the operational stability of dc-dc power supply in arctic conditions

2021 ◽  
Vol 23 (4) ◽  
pp. 166-179
Author(s):  
V. A. Shpenst ◽  
E. A. Orel
Keyword(s):  
Power Supply ◽  
Fault Tolerant ◽  
Parallel Architecture ◽  
Spare Parts ◽  
Operating Conditions ◽  
Power Supplies ◽  
Self Healing ◽  
Modular Construction ◽  
Dc Power ◽  
Arctic Conditions

THE PURPOSE. To consider the features of development and exploitation of DC-DC power supplies for Arctic conditions, to show the key problems and existing methods of solving them, to identify prospective directions in the design of this type of devices. METODS. The work is mainly an over-view with the questions of construction, circuit design, control principles, maintaining thermal equilibrium, choosing of electric elements and miniaturization. The first part of the article is devoted to the review of scientific publications and patents, in the second part the idea of using a parallel architecture in frost-resistant power supplies is considered, giving an opportunity to adapt modular principle of device construction.RESULTS. The article examines the issues of adapting the modular approach to the specifics of frost-resistant power supplies. In this way you can build a self-healing, configurable, easy-to-repair power supply of wide application. With modular construction principle the entire electrical complex consists of parallel-connected cells, placed in one hermetic and heated case (a case with connectors on the surface, as well as the control and display units). CONCLUSION. Parallel connection of the cells allows to provide a significant power reserve in the power supply, to perform a quick replacement of faulty modules without interrupting the power supply process, to increase/reduce the system power easily by changing the number of working cells. The system acquires special advantages, if the output voltage levels of the cells are adjustable. In this case, it is possible to build a universal configurable power supply of wide application, which is a novelty on the market. If you group the cells on the output, you can use one power supply for several different consumers. The spare parts for the power supply are as simple as possible and consists of ready-made cells and connecting wires. The obtained results can be used in development of fault-tolerant secondary DC-DC power supplies for hard operating conditions.

scholarly journals Improving the Reliability of DC-DC Power Supply by Reserving Feedback Signals

2021 ◽  
Vol 64 (5) ◽  
pp. 408-420
Author(s):  
V. A. Shpenst ◽  
E. A. Orel
Keyword(s):  
Power Supply ◽  
Pulse Width ◽  
Output Voltage ◽  
Fault Tolerant ◽  
Power Transformer ◽  
Operating Conditions ◽  
Power Supplies ◽  
Dc Power ◽  
Feedback Circuits ◽  
Control Circuits

The paper deals with the problem of improving the reliability of DC-DC power supplies with pulse-width modulation. The topicality of the work is related to the importance of power supply issues in modern electronics, since the quality of operation of consumer electrical appliances, including critical ones, directly depends on the serviceability of sources. The object of the study is feedback circuits aimed at stabilization of the parameters of power supply of consumers. Failures of the mentioned feedback circuits most often occurs due to the electronic components degradation under harsh operating conditions as well as under severe mechanical overloads. Such failures are dangerous for uncontrolled increase of power supply output voltage and output current. To avoid this, a new method of reserving voltage feedback signals is presented in the paper which is implemented on the basis of flyback supply topology. Feedback signals are formed from the optocoupler located on the load side and from the auxiliary winding of the power transformer, together forming two independent output voltage control circuits. Only one circuit performs stabilization at any given moment of time. If one of these circuits fails, the second one can simply replace it in its operation. The proposed method does not require any digital signal processing algorithms or microprocessor control modules and can be implemented on the basis of cheap, widely available analog chips that perform pulse-width control of the output voltage. As a result, the problem of sudden feedback loop failure is solved and the reliability of electrical equipment is increased. The validity of the proposed method is confirmed by the results of computer simulation with the use of MatLab-Simulink environment. The obtained results can be used in design of fault-tolerant secondary power supplies that operate in harsh operating conditions.

Development of a universal DC power supply using solar photovoltaic, utility and battery power sources

2011 ◽  
Vol 22 (1) ◽  
pp. 12-17
Author(s):  
Joe Oladosu Oni ◽  
Bukola Olalekan Bolaji
Keyword(s):  
Solar Radiation ◽  
Power Supply ◽  
Power Supply System ◽  
Supply System ◽  
Operating Conditions ◽  
Solar Photovoltaic ◽  
Power Sources ◽  
Dc Power ◽  
Charging Current ◽  
Dc Power Supply

In this paper, a universal direct current (DC) power supply system was developed and tested in order to provide uninterrupted power for DC appliances. The system employs simple Diode OR logic for the three power sources (mains from utility power supply, the solar photovoltaic and battery). The parallel combination of the three diodes at the output functions like a comparator circuit and compares the outputs voltage of the three sources, so that the highest voltage at a particular time feeds the DC output and supplies the charging current to the battery. The universal DC power supply system was tested under various operating conditions and the results obtained showed a good performance of the system. The system outputs, when all the power sources were available, during utility power failure and when only the stored energy in the back-up battery was available were 13.8, 13.1 and 12.2V, respectively. The system guarantees an uninterrupted power supply, which can be used to power telecommunication equipment, audiovisual materials, computers, DC motor driven devices and other DC appliances. A typical day solar radiation varied from 547 W/m2 to 865 W/m2 while the generated voltage from PV varied from 11.8 V to 13.7 V. The generated voltage from solar power source increases with the increase in solar radiation.

scholarly journals Application of infrared thermography to non-contact testing of AD/DC power supply

2016 ◽  
Vol 29 (1) ◽  
pp. 151-158 ◽  
Author(s):  
Stanisław Galla ◽  
Alicja Konczakowska
Keyword(s):  
Infrared Thermography ◽  
Power Supply ◽  
Infrared Camera ◽  
Power Supplies ◽  
Second Step ◽  
Dc Power ◽  
Basic Parameters ◽  
Dc Power Supply ◽  
Standard Tests

Testing of AC/DC power supplies using the thermography was carried out in order to assess their assembly and operation correctness before launching them on the market. The investigation was carried out for 17 AC/DC power supplies which passed the standard tests (measurements of their basic parameters and characteristics). The investigation consisted of two steps. In the first step the dispersion of temperature on power supply boards was measured after 20 minutes operating in nominal conditions. Three regions were defined as potentially revealing a failure. In the second step the acceptable temperature increments on the boards of tested power supplies were evaluated. It was proposed to assess properties of power supplies on the basis of temperature increments on their boards, registered by an infrared camera either for 12 minutes or up to 20 minutes.

scholarly journals Analysis of overcharging characteristics of a new type lithium iron phosphate battery for dc system of substation

2021 ◽  
Vol 248 ◽  
pp. 01066
Author(s):  
Liu Meijie ◽  
Gao Kai ◽  
Li Zhongwei ◽  
Qiu Peng ◽  
Meng Zhen
Keyword(s):  
Power System ◽  
Power Supply ◽  
Lithium Iron Phosphate ◽  
Rapid Development ◽  
Iron Phosphate ◽  
Operating Conditions ◽  
Lead Acid Battery ◽  
Dc Power ◽  
Emergency Power ◽  
Lead Acid

In recent years, the number of DC power system in substation has been increasing. And the technical transformation of DC power system, fault maintenance and other workload is also on the rise, therefore dc emergency power emerged. The lead-acid battery is usually adopted for traditional DC emergency power supply. The disadvantage of lead-acid battery in volume and quality makes it difficult to realize the portability and mobility of dc emergency power. Lithium iron phosphate battery technology is the frontier technology in the rapid development period. However, the characteristics are not studied clearly. This paper studies the characteristics of lithium iron phosphate battery in different ambient temperature, operating conditions, and current of charge and discharge, analyses and summarizes the characteristics of battery charge and discharge, so as to improve the maintenance of station DC power supply system and the reliability of power supply network.

Study on High-Voltage DC Power Supply for Electron Beam Furnace Based on Series Resonance

2014 ◽  
Vol 960-961 ◽  
pp. 916-920
Author(s):  
Sheng Wen Fan ◽  
Jun Du ◽  
Ze Ting Wang ◽  
Peng Wang
Keyword(s):  
Electron Beam ◽  
High Voltage ◽  
Power Supply ◽  
Short Circuit ◽  
Electron Gun ◽  
Power Supplies ◽  
Switching Loss ◽  
High Voltage Power Supply ◽  
Dc Power ◽  
Dc Power Supply

The high-voltage DC power supply for electron beam furnace belongs to Special Power Supplies. It has the characteristics of high voltage and high power. At present, the high voltage DC power supplies for electron beam furnace are mostly controlled by the silicon controlled rectifier operated by power frequency, which not only has the disadvantages of large volume but also doesn't has the characteristics of anti-short circuit capacity、 rapid protection and restart. This characteristic affects the service life of the electron gun and the quality of the smelting. To solve the above problems, a high frequency resonant converter has been used in high voltage power supply, reduced the volume of power supply and the switching loss, and achieved rapid protection and restart. Simulation and experimental research show that the power supply can meet the requirement of smelting.

An Approach to the Design of Filter Inductors for DC Power Supplies

1980 ◽  
Vol 17 (4) ◽  
pp. 325-333
Author(s):  
Stefan Szuba ◽  
Tadeusz Konopinski
Keyword(s):  
Magnetic Material ◽  
Power Supply ◽  
Design Method ◽  
Power Supplies ◽  
Dc Power ◽  
The Family ◽  
Practical Design ◽  
Magnetisation Curve

This paper describes the design method which minimises the d.c. winding resistance of an inductor for power supply. The method uses the normal magnetisation curve and the family of relative incremental permeability curves of magnetic material. The results of calculations and practical design are given and commented on.

Research on Energy Saving EDM Pulsed Power Supply with Cyclically Superimposed Chopper Circuit

2006 ◽  
Vol 315-316 ◽  
pp. 516-520 ◽  
Author(s):  
Shi Chun Di ◽  
Dong Bo Wei ◽  
Guan Xin Chi ◽  
Zhen Long Wang ◽  
J.T. Jiang
Keyword(s):  
Energy Loss ◽  
Energy Saving ◽  
Power Supply ◽  
Pulse Current ◽  
Electrical Discharge Machining ◽  
Short Circuit ◽  
Pulsed Power ◽  
Power Supplies ◽  
Pulsed Power Supply ◽  
Dc Power

This paper presents an energy saving electrical discharge machining (EDM) pulsed power supply, the principle of which is introduced. This pulsed power supply possesses no current-limiting resistors used in conventional EDM pulsed power supplies and no energy storage inductors applied in most other energy saving pulsed power supplies. Direct current from DC power supply is chopped to form many branches of paralleling spike pulse currents and the current branches are then combined into the desired pulse current for EDM machining through cyclic superimposition. The calculation method of energy loss is then analyzed. The short-circuit and contrastive machining experiments proved that the new pulsed power supply was capable of performing stable machining with higher machining efficiency and less main-machining-circuit energy loss than those of conventional EDM pulsed power supplies.

Measurement and Testing of the NSRRC Power Supply for Conduction EMI

2013 ◽  
Vol 818 ◽  
pp. 153-158
Author(s):  
Chen Yao Liu ◽  
Kuo Bin Liu
Keyword(s):  
Power Supply ◽  
Electromagnetic Interference ◽  
High Performance ◽  
Current Mode ◽  
Beam Current ◽  
Power Supplies ◽  
Output Current ◽  
Power Bus ◽  
Dc Power ◽  
The Difference

The correction power supplies are working in the Taiwan Photon Source (TPS) of NSRRC. They are required to output current at high quality and with high performance and that has long-term stability, with output current ripple required to be less than 10ppm. The TPS comprises more than 1200 units of independent power-supplymodules working together when the beam current is at3-GeV status. The power supplies are all working in current mode. We willplan to build a new measurement laboratory for conduction Electromagnetic Interference (EMI) to measure and to test the switching DC power bus thatfeeds the correction power supplies. We can get conduction electromagnetic interferencenoise from the measurement equipmentto measure the switching DC power bus is an AC-to-DC voltage bus source.With the LISN obtainingthe conduction noise, it is a high-frequency voltage noise generated by the switching mode of the power-supply conduction noise. The current signal passes an AC source-impedance stabilized network LISN, and a spectrum analyzer obtains the conduction noise. We use a noise separator to separate the common EMI noise and the difference-mode EMI noise for EMI filtering design. The measurement results are illustrated in this paper.

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