GAOHUI Micro-arc Oxidation MAO Power Source 100V 50A industrial high frequency rectifier factory direct custom current voltage rectifier

Executive Summary
The GAOHUI MAO-I Series is not a standard anodizing rectifier. It is a heavy-duty DC power supply engineered specifically for the chaotic, high-voltage threshold environment of Micro-arc Oxidation (MAO) and Plasma Electrolytic Oxidation (PEO). Unlike conventional silicon transformer units that lag during rapid voltage transients, this IGBT-based system delivers the instantaneous arc stabilization and current density control required to form dense, uniform ceramic coatings on aluminum, magnesium, and titanium alloys. It is a purpose-built solution designed to eliminate coating delamination and process inconsistency common in lower-end power supplies.
Part 1 Key Features & Engineering Highlights
Advanced IGBT Inverter Topology: Utilizes a high-frequency switching architecture (20-50kHz) to achieve precise closed-loop voltage and current control. This allows the unit to respond instantly to micro-discharge fluctuations during MAO, ensuring a uniform plasma layer across the workpiece surface.
Dual Mode Current Density Regulation: Directly controls cathode and anode current densities independently. This prevents localized arcing and maintains the specific voltage–time signature required for high-hardness coating growth on alloys like 6061 aluminum.
Adaptive Voltage Compliance: The power supply automatically adjusts output voltage (0-800V) to match the growing dielectric barrier of the oxide layer. No manual tap-changing or variable transformer needed.
Heavy-Duty Industrial Construction: Designed for 24/7 continuous operation in harsh plating environments. Features reinforced bus bars, high-IP rated enclosures, and forced air/liquid cooling for sustained 50A output without derating.
Part 2 Technical Specifications Table
| PARAMETER | SPECIFICATION |
| — | — |
| Model | GAOHUI MAO-I-10050 |
| Input Voltage | 3-Phase, 380V ± 10% / 50-60Hz |
| Rated Output Power | 50 kW |
| Max Output Voltage (CC/CV) | 0 – 800 VDC (auto-ranging) |
| Rated Output Current | 0 – 65 A (100A optional) |
| Standard Current Rating | 50 A |
| Output Type | High-Voltage DC, Unipolar |
| Inverter Technology | IGBT, High-Frequency PWM |
| Control Response | < 1 mS |
| Display | Digital Touch Panel (V, A, kWh, Process Timer) |
| Cooling Method | Forced Air / Liquid (Optional) |
Part 3 Advanced Built-in Protection Systems
Constant Current / Constant Voltage Mode with automatic cross-over prevents coating burn-off during the initial breakdown phase.
Over-Voltage and Over-Current protection (OVP/OCP) with fast-acting IGBT gate shutdown protects the load and the supply during hard short circuits.
Thermal Overload Protection with dual NTC sensors at the heat sink and IGBT module.
Phase Loss and Input Voltage Imbalance Detection prevents single-phasing damage on 3-phase mains.
Self-Diagnostic Fault Logging with real-time alarm history stored in the PLC memory for ISO compliance.
Part 4 Target Industrial Applications
Ceramic coating on 6061, 7075, and 2024 aluminum alloys for aerospace and defense components
Magnesium alloy surface hardening for automotive lightweight structural parts
Titanium implant coating for medical-grade biocompatibility improvements
Aluminum coloring processes where the MAO layer forms a stable porous base for pigment infusion
Research & Development labs requiring a high-voltage, low-ripple DC source for plasma treatment experiments
Part 5 Customization and Tailored Engineering Services
GAOHUI operates a vertically integrated IGBT rectifier manufacturer facility capable of engineering custom solutions beyond standard catalogs. We provide a complete custom current voltage rectifier service to match your process parameters. You are not limited by fixed output modules.
Custom Specifications: Available across the full spectrum of 1V to 1000V and 1A to 100,000A. Input is AC 1 or 3 phase; output is strictly DC.
High-Precision Modules:
Multi-Stage Profile Control for ramping voltage and current across your MAO cycle
Ampere-Minute Integrator for precise coating thickness calculations
Automatic Reverse Polarity (Bipolar) for advanced PEO processes
Soft-Start function to prevent destructive inrush to the plasma
Operator Interfaces: Full industrial communication integration with RS485 Modbus RTU, Ethernet/IP, and 4-20mA remote analog control. Pulse function is adjustable from 1Hz to 3000Hz for micro-arc modulation.
For an immediate quotation and to confirm your duty cycle requirements, contact our industrial high frequency rectifier factory directly. We provide the best heavy-duty DC power supply price for your application.