GAOHUI Micro-arc Oxidation MAO Power Source 750V 100A IGBT Rectifier

Executive Summary
This plasma electrolytic oxidation (PEO) power system provides the precise high-voltage pulsed DC required for turning light metals into advanced ceramics. Designed for industrial MAO lines processing magnesium, titanium, and aluminum alloys, the 75kW pulse rectifier delivers 750V 100A output with controlled voltage ramping and variable frequency pulses (1-3000Hz). System engineering focuses on generating the stable micro-arc discharge essential for uniform ceramic layers on large components.
Part 1 Key Features & Engineering Highlights
The power supply uses advanced IGBT technology to generate single-pulse or multi-pulse waveforms critical to the PEO process. Real-time voltage and current monitoring allow operators to control coating growth and porosity. This industrial high frequency rectifier factory designs the main circuit for continuous duty in harsh, corrosive environments, ensuring minimal downtime. The chassis is fully sealed against conductive dust typical in anodizing lines, while forced air cooling handles full load heat dissipation. An integrated process timer and ampere-minute calculator give precise control over coating thickness without operator intervention.
Part 2 Technical Specifications Table
| Parameter | Specification |
| — | — |
| Input Voltage | 3-Phase 380VAC 50/60Hz |
| Output Voltage Range | 0V – 800V (Continuously Adjustable) |
| Output Current Range | 0A – 100A (Continuously Adjustable) |
| Maximum Output Power | 75kW Continuous |
| Pulse Frequency Range | 1Hz – 3000Hz (Adjustable) |
| Duty Cycle Range | 10% – 90% |
| Output Type | Positive Pulse / Unipolar Pulsed DC |
| Control Mode | Pulse, Constant Voltage, Constant Current |
| Efficiency | > 92% at Full Load |
| Cooling Method | Forced Air Cooling |
| User Interface | 7-inch Touchscreen HMI |
| Communication | RS485 Modbus RTU, Ethernet IP, 4-20mA |
Part 3 Advanced Built-in Protection Systems
The unit provides comprehensive layer defense against electrical faults that can destroy process batches or damage the work cell. It includes fast-acting overvoltage and overcurrent shutoff triggered within 1 millisecond. Short circuit protection disables the IGBT bridge without latching failures. Thermal sensors trigger staged fan speed increase and ultimately a safety shutdown at 85°C junction temperature. Phase loss and input under-voltage monitoring prevent unstable arc ignition. Reverse polarity protection prevents operator error damage to the output capacitors.
Part 4 Target Industrial Applications
This power supply is optimized for Micro-arc Oxidation MAO (PEO) on magnesium alloy ceramic coating for automotive lightweight parts and armor components. It is equally suited for titanium bio-compatible oxide layers used in medical implants where voltage control determines anatase vs. rutile structure. Aluminum alloy wear-resistant coatings for aircraft landing gear benefit from the multi-stage profile control. The 100A rating enables large surface area parts including hydraulic cylinders, turbine blades, and heat exchanger panels.
Part 5 Customization and Tailored Engineering Services
Contact us for custom system configuration matched to your exact line voltage and process chemistry. As a direct IGBT rectifier manufacturer, we modify output using 1V-1000V and 1A-100,000A ranges. Input options include 415VAC, 480VAC, 600VAC, and 690VAC at 50Hz or 60Hz. Output is pure DC only. Optional modules include Process Timer for recipe closure, Multi-Stage Profile Control for multi-layer ceramic sequences, Ampere-Minute Integrator for coulomb-based thickness control, Automatic Reverse Polarity for cleaning duty, and Soft-Start to prevent electrolyte blowout on first pulse. All units include standard RS485 Modbus RTU, Ethernet/IP, and 4-20mA interfaces. Pulse functions are continuously adjustable from 1Hz to 3000Hz. Inquire about your heavy-duty DC power supply price and custom current voltage rectifier needs.