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

Anodizing magnesium, titanium, and lightweight alloys demands process precision that standard rectifiers cannot provide. This Industrial-Grade 750V 200A switching power supply is engineered for one mission: commanding the chaotic energy of Plasma Electrolytic Oxidation (PEO).
Unlike generic DC units that struggle with arc instability, this system delivers a programmable pulsed waveform that stabilizes the micro-arc discharge. The result is a dense, uniform advanced ceramic layer on the workpiece, free from surface burns or porosity. For any industrial high frequency rectifier factory scaling up PEO production, this is the core tool for achieving cycle-time consistency and material hardness targets.
PART 1 KEY FEATURES & ENGINEERING HIGHLIGHTS
High-Voltage Pulse Stability
The unit operates from 250V to 750V DC, maintaining precise voltage regulation even under abrupt load changes caused by plasma ignition. This eliminates the “voltage collapse” failure common in outdated thyristor-based supplies during the initial sparking phase.
Unipolar Pulse Rectifier Design
Delivers true 200A pulsed DC output with fast rise/fall times. This unipolar architecture reduces electrolyte heating and prevents catastrophic arcing on thin-wall aluminum alloys. The pulse pattern directly controls the coating thickness and micro-hardness of the MgO or Al2O3 layer.
Full Digital Control Interface
An industrial PLC governs all parameters. Operators set voltage, current, pulse frequency, and duty cycle on a sealed touchscreen. This allows tight Process Timer control for multi-stage profiles, ensuring the passivation layer forms optimally from initial sparking to final densification.
Scaling for Production
This unit is built for continuous duty operation inside an industrial high frequency rectifier factory. The IGBT switching topology runs at 20kHz, reducing transformer size while delivering clean power. Parallel operation for higher current applications is natively supported without external balancing gear.
PART 2 TECHNICAL SPECIFICATIONS TABLE

PART 3 ADVANCED BUILT-IN PROTECTION SYSTEMS
This power supply protects your investment and your workpiece. The onboard diagnostics include fast IGBT short-circuit detection, over-temperature shutdown on the heat sink, and primary over-voltage clamping. A dedicated arc suppression circuit terminates the pulse within microseconds if a sustained spark threatens the part surface.
These systems are standard equipment. You do not need external relays or additional safety contactors for basic operation. When evaluating a heavy-duty DC power supply price, consider that this integrated safety suite eliminates thousands of dollars in downstream wiring and panel costs.
PART 4 TARGET INDUSTRIAL APPLICATIONS
The 750V 200A rating makes this rectifier a natural fit for:
– Plasma Electrolytic Oxidation of Magnesium alloys for automotive lightweight components.
– Aluminum passivation for aerospace fasteners requiring advanced ceramic layer adhesion.
– Titanium medical implant surface treatment where coating uniformity is critical.
– High voltage spark anodizing for decorative and functional finishes on consumer goods.
– Research laboratories dedicated to PEO electrolyte development and parameter mapping.
For specialist work, the 200A limit can be scaled upward. This power supply is a building block for multi-unit arrays designed for large-area or batch processing lines.
PART 5 CUSTOMIZATION AND TAILORED ENGINEERING SERVICES
We are a custom current voltage rectifier factory, not a rigid catalog. Our engineering team configures each unit to the specific chemistry and geometry of your electrolyte and load.
Core Customization Options
– Output Voltage: 1V to 1000V DC.
– Output Current: 1A to 100,000A DC (via paralleled modules).
– Input: Accepts any 3-phase AC mains voltage globally (208V, 400V, 480V, 600V).
– Output: Fully DC only. No AC reversal unless ordered with automatic reverse polarity module.
Optional Function Modules
– Multi-Stage Profile Control: Program up to 64 distinct voltage/current/pulse steps for a complete coating cycle.
– Ampere-Minute Integrator: Track total charge delivered for scientific or quality control documentation.
– Soft-Start/Stop: Ramp voltage up over seconds to avoid thermal shock to the bath.
– Communication: RS485 Modbus RTU for PLC integration, Ethernet for remote HMI or MES data collection.
– Pulse Functions: Adjust 1-3000Hz with independent Ton/Toff control to optimize the passivation layer microstructure.
If you require a true IGBT rectifier manufacturer who understands the physics of plasma discharge, contact our engineering team with your system voltage, required current density, and workpiece material. We deliver the custom current voltage rectifier that matches your process.