Plasma Electrolytic Oxidation – 750V 200A High-Frequency Pulse IGBT Rectifier by GAOHUI

EXECUTIVE SUMMARY
This is not a standard anodizing supply. GAOHUI has engineered this 150kW system specifically for the demanding physics of Plasma Electrolytic Oxidation (PEO) known as micro-arc oxidation. It delivers a high-strike voltage and a precise, controlled arc to create advanced ceramic layers on lightweight alloys like aluminum, magnesium, and titanium. If you are sourcing from an industrial high frequency rectifier factory and need a machine that can switch from a 700V breakdown pulse to a stable 500V sustain phase without quenching the plasma, this is your tool. It is a heavy-duty, solid-state solution designed for 24/7 production of wear-resistant coatings.
PART 1 | KEY FEATURES & ENGINEERING HIGHLIGHTS
* TRUE HIGH-VOLTAGE IGBT TOPOLOGY: Unlike typical DC rectifiers that cap out at 100V, this unit operates reliably up to 750V output. This is critical for breaking through the dielectric barrier in PEO to initiate the plasma discharge. We use the latest generation IGBT modules, ensuring low switching losses and high efficiency (over 92%).
* ADJUSTABLE PULSE CONTROL FOR COATING DENSITY: PEO quality is governed by pulse energy, not just voltage. This rectifier allows independent adjustment of positive Voltage, Current, Pulse Frequency (1–3000Hz), and Duty Cycle (0–100%). This allows you to manipulate the discharge duration and intensity to produce either a dense inner layer or a porous outer layer, depending on your application requirements.
* ACTIVE ARC SUPPRESSION: In PEO, an uncontrolled arc destroys the part. Our proprietary digital control architecture detects the onset of a localized micro-arc and instantly shuts off the drive signal (within microseconds), saving the workpiece while maintaining the anodizing cycle.
* DIGITAL OPERATOR INTERFACE: The high-resolution touch panel provides real-time historical data logging of Voltage, Current, and Power. Operators can load pre-set recipes for different alloys (e.g., Titanium grade 5 vs. Magnesium AZ91D) to ensure process repeatability.
PART 2 | TECHNICAL SPECIFICATIONS

This unit is built for industrial duty. If you are checking heavy-duty DC power supply price lists, know that this machine includes proprietary snubber circuits that protect the IGBTs from the back-EMF generated during the plasma off-time—something cheap units lack.
PART 3 | ADVANCED BUILT-IN PROTECTION SYSTEMS
This rectifier features ten independent safety layers designed specifically for the high-stress environment of PEO:
– Short Circuit Protection (Instant Cut-off)
– Output Over-Voltage & Under-Voltage Protection
– Over-Current & Overload Protection (Electronic Fuse)
– Over-Temperature Protection on IGBT Heatsinks (120°C Threshold)
– Phase Loss & Input Power Imbalance Detection
– Anti-Corrosion Coating on PCBs (Designed for high humidity factory floors)
– Emergency Stop Input
– Slow-Start Ramp Function (Soft-Start) to avoid electrolyte splashing
PART 4 | TARGET INDUSTRIAL APPLICATIONS
This unit is strictly for plasma-assisted electrolytic processes. It excels in:
* PLASMA ELECTROLYTIC OXIDATION (PEO/MAO) on Aluminum, Titanium, and Magnesium alloys.
* HIGH VOLTAGE SPARK ANODIZING for creating advanced ceramic layers on lightweight alloys used in aerospace and defense.
* SURFACE PASSIVATION where standard chemical conversion is insufficient, requiring a high-energy plasma treatment.
* RESEARCH & DEVELOPMENT: The adjustable 1-3000Hz pulse allows for novel coating synthesis that is impossible with standard DC.
PART 5 | CUSTOMIZATION AND TAILORED ENGINEERING SERVICES
As a premier IGBT rectifier manufacturer, GAOHUI does not force you into a fixed frame. We provide global engineering support and custom builds.
Our factory standard range for the PEO process is: Voltage 1V–1000V and Current 1A–100,000A. Input is AC (single or three-phase), output is pure DC or Pulse DC. You are not limited to the 200A unit.
We can integrate the following modules into the control system based on your process needs:
* SUB RECIPE: Multi-stage time profile control (e.g., Stage 1: 650V for 5 mins; Stage 2: 450V for 10 mins).
* AMMETER/INTEGRATOR: Ampere-Minute or Ampere-Hour totalizer for precise energy dose per batch.
* AUTOMATIC REVERSE POLARITY: For processes requiring a cathodic cleaning step before the main anodizing cycle.
* RS485 / MODBUS RTU / ETHERNET: Full remote monitoring and PLC integration for Industry 4.0 lines.
* PULSE WIDTH MODULATION: Custom fine-tuning for specific pulse trains (unipolar or bipolar).
If you need a custom current voltage rectifier specific to your electrolyte bath geometry or part surface area (like a turbine blade or a tube interior), contact our engineering team at gaohui.com. We design the unit to match your exact load characteristics.