Next Article in Journal
Solid Target System with In-Situ Target Dissolution
Previous Article in Journal
Enhancement and Validation of a 3D-Printed Solid Target Holder at a Cyclotron Facility in Perth, Australia
Article Menu

Export Article

Open AccessArticle

Smart Arbitrary Waveform Generator with Digital Feedback Control for High-Voltage Electrochemistry

Scientific and Technical Centre “Pokrytie-A”, Novosibirsk 630015, Russia
Instruments 2019, 3(1), 13; https://doi.org/10.3390/instruments3010013
Received: 23 December 2018 / Revised: 29 January 2019 / Accepted: 4 February 2019 / Published: 7 February 2019
  |  
PDF [6880 KB, uploaded 26 February 2019]
  |     |  

Abstract

This paper describes a design approach to a control system of power supply for high-voltage electrochemical processes such as plasma electrolytic oxidation (PEO) or high-voltage anodising (HVA), which require alternating polarisation pulses up to 750 V and a typical current density of 50–500 mA/cm2. Complex characteristics of the electrochemical system response on applied polarisations (positive or negative) cause necessity of precise control of polarising pulse shapes for better process operation and its understanding. A device performs cycle-by-cycle pulse-width modulation (PWM) control, including feedback based on digital analysis of the instantaneous current and/or voltage output, and the desired pulse waveform stored in memory for each output polarity. The output stage has four states corresponding to positive or negative pulses, as well as open- or short-circuit conditions, with respect to an electrochemical cell. A fully programmable controller allows one to generate arbitrary waveforms, as well as their sequences, by means of “regime designer” software. Moreover, a smart feedback system can provide adaptation of the next pulse parameter from analysis of the process prehistory. For instance, this approach allows one to separate main electrochemical process (coating formation) and diagnosis of the phenomenon through introduction of high-voltage triangular voltage sweep pulse within a pause of the main process, which is normally carried out under a current control. View Full-Text
Keywords: pulse shaping; plasma electrolytic oxidation; switching power supply; digital signal processing; digital feedback loop; proportional–integral–differential (PID); soft sparking mode pulse shaping; plasma electrolytic oxidation; switching power supply; digital signal processing; digital feedback loop; proportional–integral–differential (PID); soft sparking mode
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Rogov, A.B. Smart Arbitrary Waveform Generator with Digital Feedback Control for High-Voltage Electrochemistry. Instruments 2019, 3, 13.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Instruments EISSN 2410-390X Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top