GAOHUI Hard Chrome Plating Rectifier 24V 3000A High Current DC Power Supply For Industrial Coating

Executive Summary
This unit is engineered specifically for the brutal demands of hard chrome deposition, where waveform purity and current stability are non-negotiable. As an industrial high frequency rectifier factory, we have designed this 24V 3000A system to eliminate dangerous voltage spikes that cause nodular deposits and poor adhesion. Unlike low-cost, generic switching supplies, this rectifier delivers a true three-phase, smooth DC waveform, ensuring precise chrome thickness control on hydraulic cylinders and large industrial rolls.
Part 1 Key Features & Engineering Highlights
Full-Silicon Carbide (SiC) Power Stage: Unlike standard IGBT units, our SiC modules operate at higher frequencies (up to 50kHz), reducing output ripple to under 1% p-p. This is critical for hard chrome to avoid hydrogen embrittlement and achieve uniform micro-hardness.
Heavy-Duty Forced Air Cooling: Designed for 24/7 continuous operation in harsh plating environments. The air path is ducted to evenly cool all power components, preventing hot spots that cause premature failure. This enables a competitive heavy-duty DC power supply price without sacrificing long-term field reliability.
Precision Current Voltage Regulation: The digital PID controller maintains setpoints within ±0.5% of range, even under varying load conditions from large rack plating baths. As a leading IGBT rectifier manufacturer, we guarantee stable output from start to finish of every chrome cycle.
Part 2 Technical Specifications Table
| Parameter | Value | Notes |
| :— | :— | :— |
| DC Output Voltage | 0-24V | Adjustable, 1V resolution |
| DC Output Current | 0-3000A | Continuous rated, 110% peak for 1 min |
| Input Power | 3-Phase, 380V / 480V AC +/-10% | 50/60Hz |
| Output Ripple | 92% | At nominal load |
| Cooling Method | Forced Air (Ducted) | 3 x high static pressure fans |
| Control Interface | 7-inch Color Touchscreen | Real-time voltage, current, ampere-hour |
| Dimensions (W x D x H) | 800mm x 1000mm x 1800mm | Floor standing, steel enclosure |
| Weight | Approx. 420 kg | For domestic shipping |
Part 3 Advanced Built-in Protection Systems
This 24V 3000A unit integrates multi-layer safety features to protect both the rectifier and the plating bath. Over-current protection (OCP) shuts the output immediately if load exceeds 110% rated. Over-voltage protection (OVP) clamps output at 26V. Additional thermal protection triggers automatic fan speed increase before shutdown at 85°C. An under-voltage lockout prevents operation on unstable electrical lines. All fault logs are stored on the internal memory for troubleshooting.
Part 4 Target Industrial Applications
This rectifier excels in heavy industrial coating processes. Primary applications include hard chrome plating of hydraulic cylinder rods, large hydraulic rams, and piston pins. It is equally effective for hard coating of mold cavities, printing rolls, and marine shafts. The clean DC output is also suitable for sulfamate nickel plating and demanding anodizing processes where tight thickness tolerances are required.
Part 5 Customization and Tailored Engineering Services
We offer deep customization beyond standard catalog specifications. Our factory can engineer a custom current voltage rectifier for your exact bath configuration. Voltage range: 1V to 1000V DC. Current range: 1A to 100,000A DC. Input can be adapted to any AC line (208V / 415V / 600V / 690V, single or three-phase). Output is always DC.
We integrate advanced process control modules on request:
Process Timer: Preprogrammed ramp-up and hold cycles for multi-step chrome plating.
Multi-Stage Profile Control: Up to 16 steps with adjustable time/current/voltage per step.
Ampere-Minute Integrator: Records total charge for precise thickness calculation.
Automatic Reverse Polarity (ARP): Periodic current reversal for complex geometry parts.
Soft-Start / Soft-Stop: Prevents arc damage on contacts.
Communication Interfaces: RS485 Modbus RTU, Ethernet/IP, 4-20mA analog control, plus Pulse Functions (1 to 3000Hz adjustable) for specialized coatings.
Our in-house engineering team provides application support to select the precise output characteristics, ensuring our rectifier integrates seamlessly into your existing automated line.