Micro-arc Oxidation MAO Power Source 750V 100A | Industrial High Frequency Rectifier for Plasma Electrolytic Oxidation PEO

Executive Summary
Engineered for the demanding physics of micro-arc oxidation (MAO), also known as plasma electrolytic oxidation (PEO), this 75kW IGBT-based rectifier delivers a constant voltage output up to 800V with a stable 100A current. Designed by a leading IGBT rectifier manufacturer, this system provides the hard arc energy density required to transform aluminum, magnesium, and titanium alloy surfaces into dense, wear-resistant ceramic oxide layers. Unlike general-purpose anodizing rectifiers, this unit features adaptive voltage-time compliance control, automatically adjusting output to maintain the critical micro-discharge regime during the coating cycle, ensuring uniform ceramic thickness across complex geometries.
Part 1 Key Features & Engineering Highlights
IGBT inverter technology provides fast, precise voltage slew rates necessary to initiate and sustain a stable micro-arc plasma discharge without quenching. The unit’s proprietary multi-pulse profile controller allows operators to pre-set ramp, hold, and arc finishing stages, dramatically improving coating density and reducing energy waste compared to standard DC or linear silicon-controlled rectifier (SCR) topologies. As a dedicated industrial high frequency rectifier factory, we have optimized the main transformer and output filter for MAO’s characteristically high electrical noise and long processing cycles. The result is a power source that delivers a clean, consistent arc with minimal ripple, extending electrode life and reducing electrolyte contamination.
Operators benefit from true constant voltage (CV) and constant current (CC) modes with crossover, allowing precise control of current density on the workpiece. The soft-start function prevents catastrophic arc strikes when initially immersion loading large parts. A built-in ampere-minute integrator tracks total delivered charge, giving you exact process repeatability for batch production, from decorative MAO coatings to functional ceramic layers for aerospace wear surfaces.
Part 2 Technical Specifications Table

Part 3 Advanced Built-in Protection Systems
Direct metal-to-electrolyte contact and high-energy micro-arcs can generate destructive transients. This MAO power source incorporates multiple protection layers: Overvoltage and overcurrent lockout instantly disconnect output during a catastrophic breakdown event. Thermal overload protection monitors IGBT junction temperature, automatically derating power before heat stress damages switching modules. An arc-fault detection algorithm differentiates between normal plasma micro-discharges and dangerous sustained arcs (burn-through), triggering a rapid shut-off within microseconds. Input phase-loss and undervoltage protection safeguards the modular power supply during unstable grid conditions found in factory environments. All protection limits are programmable through the front panel or remote interface, allowing the heavy-duty DC power supply price to include long-term reliability features not found in general power supplies.
Part 4 Target Industrial Applications
Precision rectifier dedicated for high-voltage ceramic coating processes: plasma electrolytic oxidation (PEO) for magnesium alloy ceramic coating on automotive and aerospace casings; micro-arc oxidation for titanium bio-compatible oxide layers on surgical implants and wear components. Also directly applicable to aluminum alloy hard ceramic coating for defense and heavy equipment anodizing lines. The 750V output specifically supports thicker coating regimes (up to 150 microns) on light metals without spalling, which is critical for wear resistance and corrosion protection in offshore and chemical processing industries.
Part 5 Customization and Tailored Engineering Services
We operate as a direct factory engineering team, offering scalable solutions from 1V-1000V and 1A-100,000A. Input is AC, output is pure DC. Every unit can be tailored with advanced process modules: multi-stage profile control (up to 100 steps) with ramp/soak/pulse for complex PEO recipes; ampere-minute integrator for batch charge tracking; automatic reverse polarity switch for duplex coatings; and dedicated soft-start for ultra-low approach current. Communication capabilities include RS485 Modbus RTU, Ethernet IP, and 4-20mA analog control for seamless integration into existing MES systems. Pulse functionality ranges from 1Hz to 3000Hz adjustable, enabling specialized high-density micro-arc treatments. We encourage direct inquiry for IGBT rectifier manufacturer customization on a custom current voltage rectifier for your specific mass production line.