Power Supply for the Investigation of Pulse Electrochemical Processes

Aliakseyeu, Yu. G.; Korolyov, A. Yu.; Нисс, В. С.; Паршуто, А. Э.; Soroka, E. V.; Budnitskiy, A. S.

doi:10.21122/1029-7448-2019-61-3-246-257

Izv. vysh. ucheb

2018

DOI: 10.21122/1029-7448-2019-61-3-246-257

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Power Supply for the Investigation of Pulse Electrochemical Processes

Yu. G. Aliakseyeu¹,

A. Yu. Korolyov²,

В. С. Нисс³

et al.

Abstract: Реферат. В последнее время в промышленности появилась тенденция использования мето-дов электрохимической обработки, основанных на применении милли-и микросекундных импульсов различной полярности и амплитуды вместо постоянного тока. Применение им-пульсного тока позволяет во многих случаях получить необходимый эффект более деше-выми средствами и обеспечить дополнительную управляемость электрохимическим про-цессом за счет регулировки временных параметров импульсов тока, снизить энергетические затраты на процесс п… Show more

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Cited by 4 publications

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“…The required value of the current density was set by changing the voltage. To process the samples, we used experimental equipment consisting of an adjustable constant voltage source [29], a block of the system for forming pulses of a given duration, a bath with devices for heating, cooling, and stirring the electrolyte (Figure 2). The measurement of the surface roughness of the samples before and after processing was carried out using an MII-4 micro interferometer.…”

mentioning

confidence: 99%

Electrochemical polishing of matrix stents of the 316LVM steel using microsecond pulses

Aliakseyeu¹,

Korolyov²,

Нисс

et al. 2021

Vescì Akademìì navuk Belarusì. Seryâ fizika-tehničnyh navuk

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With the development of minimally invasive treatment technology, coronary stents made of corrosion-resistant steel are in demand for restoring the patency of blood vessels. The effectiveness of coronary stenting depends on various factors, but the quality of the surface of the stents is a major factor. The higher the quality of the surface of the stent is, the less negative the effect on the circulatory system, arterial walls, and the higher the biocompatibility of the stent is. The complex shape, small cross-section, size, and low rigidity of coronary stents are the main reasons for the inability to ensure high surface quality using mechanical finishing methods. Therefore, electrochemical methods are used to polish stents. For electrochemical polishing (ECP) of stents, an electric mode based on direct current is traditionally used. The disadvantages of direct current ECP are excessive metal removal and the need to use electrolytes of complex compositions, often containing toxic components. As an alternative to the traditional ECP with the use of direct current, we have proposed a method of pulsed ECP using pulses of microsecond duration for polishing stents. The use of pulsed current allows one to achieve a significant increase in the efficiency of the SEC process, when, due to the localization of the anodic dissolution, the smoothing speed of the microroughness of the treated surface, referred to the total metal removal, increases significantly. The paper presents a comparative analysis of ECP modes using direct and pulse current to change the surface roughness, removal, radius of curvature of the edges, and corrosion resistance on the example of stents made of the 316LVM stainless steel. Based on the results of the studies, technological regimes of pulsed ECP were established that provide the highest quality polishing of the stent surface with a small metal removal with a slight rounding of the edges.

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mentioning

confidence: 99%

Electrochemical polishing of matrix stents of the 316LVM steel using microsecond pulses

Aliakseyeu¹,

Korolyov²,

Нисс

et al. 2021

Vescì Akademìì navuk Belarusì. Seryâ fizika-tehničnyh navuk

Self Cite

View full text Add to dashboard Cite

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

Shpenst

Орел

2021

Izv. vysh. ucheb

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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.

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The Use of Pulsed Modes in the Electrochemical Polishing of Corrosion-Resistant Steels

et al. 2019

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However, the ECP in its classical form has a number of significant drawbacks. One of them is a dependence of treatment modes and electrolyte compositions on the processed material. In addition, aggressive expensive electrolytes that require special technologies for disposal are used for ECP. Electrolytes in ECP often require heating to a temperature of 60–90 °C. Processing at such temperatures causes significant harm to the environment and production personnel. To eliminate the existing disadvantages of the ECP and expand its technological capabilities, a processing method with application of pulsed unipolar and bipolar modes has been proposed. As a result, fundamentally new processes of pulse ECP with a pulse duration of 0.05–20.00 ms have been developed. They provide a reduction of energy costs for the process and high efficiency of polishing in comparison with traditional DC polishing. The rate of smoothing micro-roughness of the treated surface related to the total metal removal is significantly increased. The use of pulse modes in comparison with traditional ECP allows processing in universal electrolytes of simple compositions based on sulfuric and orthophosphoric acids without addition of chromium anhydride. Application of the developed pulse modes, which will provide at low metal removal a significant change in surface roughness, is the most appropriate for the ECP of precise parts, products or parts of small cross-section and rigidity, such as medical devices for minimally invasive surgery, precision engineering parts, etc. The paper presents results of a study for influence of pulsed unipolar and bipolar ECP modes on the surface quality of stainless steel specimens, as well as a comparative analysis of the efficiency of using pulsed ECP modes instead of DC polishing. The technological parameters of ECP using pulsed modes, providing the highest quality surface polishing with high efficiency of micro-roughness smoothing and low energy consumption have been established in the paper.

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Power Supply for the Investigation of Pulse Electrochemical Processes

Cited by 4 publications

References 4 publications

Electrochemical polishing of matrix stents of the 316LVM steel using microsecond pulses

Electrochemical polishing of matrix stents of the 316LVM steel using microsecond pulses

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

The Use of Pulsed Modes in the Electrochemical Polishing of Corrosion-Resistant Steels

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