Aluminum Anodizing – 24V 2000A GAOHUI IGBT Rectifier for Hard Coat & Decorative Treatment

EXECUTIVE SUMMARY
Achieving consistent, high-density oxide layers in aluminum anodizing demands a power source that delivers unwavering voltage stability and precise current regulation. This GAOHUI 24V 2000A anodizing rectifier is engineered specifically for the demanding requirements of Type II decorative anodizing and Type III hard coat anodizing. Unlike conventional transformer-based units, this unit leverages advanced IGBT switching technology from our industrial high frequency rectifier factory to provide ripple-free DC output, critical for uniform pore formation and dye tank coloring consistency. Whether you are processing architectural extrusions or aerospace aluminum treatment components, this rectifier provides the tight process control needed to reduce rework and minimize energy waste.
PART 1: KEY FEATURES & ENGINEERING HIGHLIGHTS
High-Frequency IGBT Topology: The core of this system is a fully digital IGBT inverter. This topology eliminates the heavy copper windings of older SCR units, reducing unit weight by over 40% while improving efficiency to above 92%. The high switching frequency ensures a DC output with less than 1% ripple, preventing “burned” parts and ensuring consistent coating thickness across complex part geometries.
Constant Current / Constant Voltage Control: The rectifier offers seamless transition between CC and CV modes. In the initial ramp-up stage of anodizing, CC mode ensures a controlled oxide formation. The unit then smoothly transitions to CV mode to prevent voltage spikes that can cause dielectric breakdown in high-voltage hard coat processes.
Low Ripple, High Stability: Maximum output ripple is held below 0.5% in CC mode. This is non-negotiable for heavy-duty DC power supply price sensitivity customers who require Class 1 finishes without haze or iridescence.
PART 2: TECHNICAL SPECIFICATIONS TABLE
| Parameter | Specification |
| — | — |
| Input Voltage | 3-Phase 380VAC ±10%, 50/60Hz, or custom |
| Output Voltage | 0-24VDC (continuously adjustable) |
| Output Current | 0-2000A (continuously adjustable) |
| Output Power | 48kW |
| Control Mode | Constant Current, Constant Voltage, Pulse |
| Efficiency | >92% at full load |
| Ripple | <1% RMS / <3% peak-to-peak |
| Display | Digital LED (Voltage / Current) |
| Cooling | Forced Air (or Deionized Water) |
| Protection Class | IP54 (main enclosure) |
| Communication | RS485 Modbus RTU / Ethernet / 4-20mA |
| Weight | Approx. 350kg |
| Dimensions | 900 x 700 x 1200 mm (W x D x H) |
PART 3: ADVANCED BUILT-IN PROTECTION SYSTEMS
This unit does not simply shut down when a fault occurs; it uses predictive protection to preserve the load and the rectifier. The armor includes surge suppression on the AC line, DC output short-circuit protection, and over-temperature shutdown with a fan-failure detection algorithm. For anodizing lines where a load break can cause a fire, the system includes an automatic arc-fault detection circuit that cuts power in under 5 milliseconds. The included soft-start function eliminates the inrush current that often damages contactors and fuses in older systems.
PART 4: TARGET INDUSTRIAL APPLICATIONS
Decorative Anodizing (Type II): Ideal for achieving bright, transparent, or dyed finishes on aluminum extrusions, heat sinks, and interior trim. The stable voltage minimizes uneven dye pickup, drastically reducing rejects in high-volume dye tank coloring operations.
Hard Coat Anodizing (Type III): While the nominal voltage is 24V, the control logic and high-current capability allow the system to drive cold electrolyte baths for dense, wear-resistant coatings. This makes it suitable for aerospace aluminum treatment of landing gear components and hydraulic manifolds.
Plating and Electrolytic Coloring: The pulse function (1-3000Hz adjustable) enables the deposition of two-step electrolytic color processes (e.g., bronze to black) on architectural aluminum without shifting to a second rectifier.
PART 5: CUSTOMIZATION AND TAILORED ENGINEERING SERVICES
As a certified IGBT rectifier manufacturer, GAOHUI does not force you to adapt your process to a standard machine. We provide a full platform of customization options to create a true custom current voltage rectifier for your exact production line.
Voltage & Current Scaling: Standard units range from 1V to 1000VDC and 1A to 100,000A. Your 24V 2000A unit can be built as part of a multi-rack parallel system for larger tanks.
Integration Modules: We integrate critical process controllers directly into the rectifier touchscreen interface.
Process Timer: Automates anodizing cycle stages.
Multi-Stage Profile Control: Program up to 50 ramp/hold/ramp segments for complex hard coat chemistries.
Ampere-Minute Integrator: Real-time calculation of charge density (A-min/sq.ft) for consistent thickness.
Automatic Reverse Polarity (ARP): Periodic voltage reversal for specialized etching or desmutting.
Soft-Start: Ramp rate adjustable from 1 second to 60 minutes.
Industrial Communication & External Control:
RS485 Modbus RTU for PLC (Siemens, Allen Bradley, Mitsubishi)
Ethernet/IP or TCP/IP for factory SCADA integration
4-20mA analog input for remote knobs or slave-chase control
Pulse Functions: Fully adjustable frequency (1-3000Hz) and duty cycle (0.1-99.9%) for pulse anodizing applications that improve film density.
Every unit undergoes a 48-hour burn-in at full load before shipping from our factory. We provide complete schematics, programming ladder logic, and a 2-year warranty covering parts and labor. Contact our engineering team to discuss your tank layout, coolant availability, and control room configuration.