Industrial-Grade 60V/40A Micro-arc Oxidation MAO Power Supply

Executive Summary
This is not a generic rectifier. It is a precision-engineered current source designed to run the violent, stochastic dynamics of plasma electrolytic oxidation (PEO). Operated by clients at a leading industrial high frequency rectifier factory, this unit delivers the exact voltage compliance and current density demanded by aluminum, magnesium, and titanium alloy MAO processes. It replaces slow, inefficient thyristor-based systems with hard-switching IGBT technology, providing real-time arc suppression and process repeatability. If you need to manufacture ceramic coatings at scale without dielectric breakdown or batch failure, this is your primary tool.
Part 1 Key Features & Engineering Highlights
True 60V Compliance: The power supply automatically adjusts its output voltage to follow the growing dielectric barrier during MAO formation. Fixed cathode and anode current densities are maintained regardless of load impedance, preventing early arc extinction.
Heavy-Duty IGBT Switching: Using high-speed IGBT inverter modules, this unit achieves over 92% efficiency at full load. Unlike SCR systems, it generates <5% ripple at rated current, which directly translates to denser, more uniform ceramic layers.
Digital Constant Current Regulation: Both current and voltage are sampled at 10kHz with closed-loop PID control. This enables stable anodizing even when the electrolyte temperature fluctuates or the workpiece surface area changes mid-cycle.
High-Frequency Pulse Capability: Our standard unit includes a pulse function module. The output can be modulated from 1Hz to 3000Hz with independent control of duty cycle. This is critical for PEO because short pulses limit thermal stress and prevent local overheating that can destroy the coating.
Part 2 Technical Specifications Table

Part 3 Advanced Built-in Protection Systems
Every unit includes eight layers of protection that operate independently of the control processor. Overvoltage protection kicks in at 105% of the maximum set voltage during MAO initiation. Overcurrent protection is adjustable from 1A to 42A, with reaction time under 5 microseconds. A real-time ground fault detection circuit identifies leakage paths through the electrolyte tank before the plasma discharge can damage the workpiece or operator.
Additionally, the hard-switching IGBT bridge is protected by a dedicated hardware desaturation detection circuit, which monitors collector-emitter voltage on every switching cycle. If a short circuit is detected across the output bus, the drive signal is removed within 1.5 microseconds, preserving the semiconductor modules and eliminating the heavy-duty DC power supply price risk of catastrophic failure.
Part 4 Target Industrial Applications
This power supply is optimized for Micro Arc Oxidation (MAO) and Plasma Electrolytic Oxidation (PEO) processes. It applies directly to aluminum alloys for aerospace structural parts, magnesium alloy components for automotive lightweighting, and titanium implants where bio-compatible ceramic coatings are mandatory. The unit also serves as a direct replacement for older thyristor-based MAO equipment, where the upgrade to high-frequency IGBT switching improves coating hardness (HV 1500–2200) and reduces energy consumption by approximately 25%.
Part 5 Customization and Tailored Engineering Services
As a recognized IGBT rectifier manufacturer, we offer complete customization of this platform to match your unique process parameters. The standard 60V/40A unit can be expanded to a full range from 1V to 1000V and 1A to 100,000A based on your tank size and throughput targets. We provide engineering support to integrate our rectifier into your existing production line, including control cabinet wiring, PLC handshake, and SPC data logging.
Optional process modules include a multi-stage profile controller for ramping voltage or current in up to 64 distinct steps, a process timer for automatic cycle termination, and an ampere-minute integrator that precisely calculates the charge delivered for coating thickness control. For applications requiring thick or layered coatings, we offer automatic reverse polarity switching—cathodic and anodic cycles can be alternated with adjustable dwell time and amplitude.
Communication interface choices cover RS485 Modbus RTU, Ethernet/IP, and analog 4-20mA for direct connection to your supervisory system. The pulse function generator produces square-wave outputs from 1Hz to 3000Hz with independent setting of pulse width and amplitude, enabling PEO process optimization that is simply not possible with legacy equipment.
To request a custom current voltage rectifier solution for your specific MAO or PEO application, contact our engineering team. We build every unit to order with full factory testing under simulated load. Lead times typically run 4 to 6 weeks from specification approval.