Review of Power Electronic Solutions for Dielectric Barrier Discharge Applications

This paper presents a comprehensive review of dielectric barrier discharge (DBD) power supply topologies, aiming to bridge the gap between DBD applications and power electronics design. Two key aspects are examined: the dependence of the DBD electrical model on reactor geometry, and application-driven requirements for injected waveform characteristics, including shapes, voltage amplitude, frequency, and modulation techniques. On this basis, the paper systematically reviews two major categories of power supplies: sinusoidal types comprising transformerless and transformer-based resonant inverters, and pulsed power supplies (PPSs). The review summarizes performance trade-offs, highlights untested topologies and emerging applications, and offers guidance for advancing high-performance DBD power supply design for next-generation systems.

💡 Research Summary

The manuscript presents a comprehensive review of power‑electronic solutions for dielectric barrier discharge (DBD) applications, aiming to bridge the gap between plasma‑science requirements and modern power‑converter design. It begins by outlining the fundamental advantages of DBD – atmospheric‑pressure, low‑temperature plasma generation with a dielectric barrier that suppresses arcing and enables uniform electric fields. Because DBD can produce reactive radicals and ions without vacuum equipment, it finds use in polymer processing, biomedical treatments, food sterilization, catalytic reactions, and emerging flexible‑electronics‑based plasma sources.

Section II surveys the main reactor geometries (volume DBD, packed‑bed DBD, fluidized‑bed DBD, surface DBD, floating‑electrode DBD, flexible DBD) and explains how each geometry influences the equivalent electrical model. The classical model consists of a dielectric capacitance (C_d) in series with a gas capacitance (C_g) and a threshold element that becomes a low‑resistance plasma path once the applied voltage exceeds V_th. While this model works for ideal, symmetric reactors, the authors point out that non‑ideal reactors (e.g., packed‑bed, fluidized‑bed, surface DBD) exhibit lens‑shaped Lissajous curves, requiring variable resistors or voltage sources in the equivalent circuit to capture time‑varying capacitance and resistance.

Sections III and IV discuss waveform requirements. Three basic waveform families are considered: sinusoidal, square, and pulsed (unipolar or bipolar). Sinusoidal excitation yields multiple stochastic micro‑discharges per half‑cycle, providing stable ozone production but relatively high average power. Pulsed waveforms with fast rise times generate a single, simultaneous discharge across the electrode area, improving ionization efficiency and reducing energy waste. Unipolar pulses suppress reverse discharges, which is advantageous for uniform surface treatment, whereas bipolar pulses can introduce secondary discharges that increase loss. Frequency is another critical dimension: low‑frequency (tens of Hz to a few kHz) operation favors filamentary discharges; tens of kHz brings a “memory effect” that reduces filament count and can produce diffuse Glow DBD (G‑DBD) or Townsend DBD (T‑DBD); MHz‑range RF‑DBD sustains bulk ionization but demands sophisticated high‑frequency resonant circuitry.

The core of the review (Sections V and VI) classifies power‑supply topologies into two overarching categories.

1. Sinusoidal supplies – These are further divided into transformer‑less approaches (boost, flyback, or push‑pull converters that directly step up voltage) and transformer‑based resonant inverters (LC, LLC, LCC, or other resonant networks). Transformer‑less designs are compact and low‑cost but face insulation limits and voltage‑stress challenges at the required kV levels. Transformer‑based resonant converters can achieve high voltage and high frequency with good efficiency, yet they involve core losses, magnetic saturation, and precise tuning of resonant components.

2. Pulsed Power Supplies (PPS) – The authors review Marx‑type generators, high‑voltage pulse transformers, and SMPS‑derived pulse modulators. These architectures can deliver nanosecond‑to‑microsecond pulses with peak voltages from several kilovolts up to tens of kilovolts, matching the threshold requirements of most DBD reactors while minimizing average power consumption. The trade‑offs involve switching losses, voltage‑spike management, and the need for tight regulation of pulse width and repetition rate.

A comparative table (Table I) quantifies the performance of each discharge mode (filamentary, Townsend, Glow, RF‑DBD) in terms of ionization density, required voltage, power factor, and efficiency. Subsequent figures compare the efficiency, voltage/current ripple, electromagnetic interference, cost, size, and reliability of each power‑topology.

Sections VII and VIII identify gaps and future directions. The authors highlight under‑explored hybrid configurations that combine transformer‑based resonant stages with fast‑pulse modules, the potential of SiC and GaN devices for high‑voltage, high‑frequency operation, and the role of AI‑driven real‑time waveform optimization to adapt to changing load conditions (e.g., gas composition, temperature). They also call for standardized benchmarking methods, advanced diagnostic tools for in‑situ plasma monitoring, and modular, scalable designs that can be re‑configured for different reactor geometries.

In conclusion, the paper asserts that successful DBD power‑supply design must start from an accurate, geometry‑aware electrical model and then select a waveform (shape, amplitude, frequency, modulation) that aligns with the specific plasma chemistry and process goals. Sinusoidal resonant inverters are best suited for continuous, high‑throughput applications, while pulsed supplies excel in energy‑efficient, high‑peak‑power scenarios such as ozone synthesis, plasma actuators, and biomedical treatments. Designers must balance efficiency, cost, footprint, and reliability, and future progress will likely stem from integrating wide‑bandgap semiconductor switches, digital control loops, and intelligent waveform synthesis to meet the increasingly demanding performance envelope of next‑generation DBD systems.