Heavy Duty Plasma Electrolytic Oxidation Power Supply (750V 200A) for Surface Engineering

Industrial-Grade 750V 200A IGBT Rectifier for Micro-Arc Oxidation and High Voltage Anodizing
This high-current switching power supply is engineered specifically for the demanding requirements of plasma electrolytic oxidation (PEO) and micro-arc oxidation (MAO) processes. Designed at an industrial high frequency rectifier factory, it delivers the precise pulsed DC energy required to create advanced ceramic layers on lightweight alloys such as aluminum, titanium, and magnesium. Built for 24/7 operation, this unit replaces conventional linear transformers with a high-efficiency IGBT-based system, offering stable high-voltage output and superior process control for repeatable coating quality.
Part 1 Key Features and Engineering Highlights
PULSED DC TECHNOLOGY FOR DENSE CERAMIC COATINGS
Unlike standard DC supplies, this unit features programmable pulse waveforms essential for PEO. The inverter utilizes high-frequency switching to deliver controlled energy bursts, forming uniform, hard oxide layers with enhanced corrosion and wear resistance. This reduces thermal stress on the workpiece and improves coating adhesion.
HIGH EFFICIENCY AND POWER DENSITY
By employing modern IGBT modules and a compact transformer design, this power supply achieves significantly higher conversion efficiency than traditional SCR units. This translates directly into lower operational costs and reduced cooling requirements for your facility.
PRECISE VOLTAGE AND CURRENT REGULATION
A dual-loop control system maintains output stability within 1% of the setpoint, critical for the narrow voltage windows required during plasma formation. The unit supports both constant voltage (CV) and constant current (CC) modes for process flexibility.
RUGGED INDUSTRIAL CONSTRUCTION
Housed in a heavy-duty IP54-rated enclosure, the system includes bus bars, forced air cooling with redundant fans, and corrosion-resistant coatings. All internal components are rated for continuous duty in harsh factory environments.
Part 2 Technical Specifications Table
| Parameter | Specification |
| — | — |
| Output Voltage Range | 0 to 750 V DC |
| Output Current Range | 0 to 200 A DC |
| Input Voltage | 3-Phase, 380V / 480V AC |
| Output Type | Unipolar Pulsed DC |
| Pulse Frequency | 1 – 3000 Hz Adjustable |
| Duty Cycle | 10% – 90% Adjustable |
| Efficiency | > 90% at Full Load |
| Regulation Mode | Constant Voltage / Constant Current |
| Control Interface | RS485 Modbus RTU, Ethernet, 4-20mA |
| Cooling Method | Forced Air |
| Protection Class | IP54 |
| Operating Temperature | -10°C to +45°C |
Part 3 Advanced Built-in Protection Systems
The power supply incorporates a multi-layer safety architecture to protect both the equipment and the process batch from faults. The system actively monitors for overvoltage and overcurrent events, immediate shutdown upon short circuit detection, thermal overload protection with redundant temperature sensors, and phase loss detection for the AC input. These features ensure safe operation during the high-energy plasma arcs inherent to PEO.
Part 4 Target Industrial Applications
This 750V/200A rectifier is the optimal solution for a range of high-voltage surface treatments, specifically plasma electrolytic oxidation (PEO) of magnesium components, micro-arc oxidation (MAO) of aluminum alloys, lightweight alloy passivation for aerospace and automotive parts, and specialized high voltage spark anodizing processes. The pulsed output is critical for controlling the dielectric breakdown that forms ceramic layers, making it the preferred choice for advanced anodizing facilities.
Part 5 Customization and Tailored Engineering Services
As a dedicated IGBT rectifier manufacturer, we provide full customization to match your exact line requirements. Our factory can deliver any output combination from 1V to 1000V and from 1A to 100,000A, with a standard input of AC mains and output of DC only. We integrate advanced process modules on request, including a programmable Process Timer, a Multi-Stage Profile Controller, an Ampere-Minute Integrator for precise coating thickness, Automatic Reverse Polarity for cleaning cycles, and Soft-Start functionality. Communication interfaces include RS485 Modbus RTU, Ethernet TCP/IP, and analog 4-20mA. We also fit our units with pulse functions adjustable from 1Hz to 3000Hz to fine-tune plasma dynamics. Contact our engineering team to discuss your custom current voltage rectifier requirements and receive a competitive heavy-duty DC power supply price quote.