Electrophoretic power supply is the core power equipment of electrophoretic coating process, and its parameters directly determine the uniformity, adhesion and production efficiency of the coating, especially in the fields of automobile manufacturing, hardware anti-corrosion and industrial automation.

Core parameter system

Output voltage: The mainstream range for cathodic electrophoresis is 200-350V, and for anodic electrophoresis it is 50-250V. High end devices support a wide range adjustment of 0-1000V to adapt to the "critical voltage" and "breakdown voltage" characteristics of different paint types.

Current output: Based on the surface area of the workpiece and the Coulombic efficiency of the electrophoretic paint (about 20-30 mg/C for cathode paint), the industrial power supply current can reach 50-500A, while laboratory equipment can reach 1-500mA.

Ripple factor: must be ≤ 5% RMS. The high-frequency power supply adopts 12 pulse rectification technology to achieve a ripple frequency of 600Hz, effectively suppressing pinholes and color differences in the film layer.

Output mode: Mainstream devices support automatic switching of constant voltage, constant current, and constant power (three constants), and some models have multi-stage process programming, 0-10 second soft start, and RS485/MODBUS communication interfaces to achieve linkage with MES systems.

Power level: Small equipment (<300W) used in laboratories or hardware; The car body production line requires a high-power power supply of ≥ 50kW, in conjunction with a water cooling system to maintain continuous operation.

Industry standards and safety regulations

The terminology and process definitions are based on GB/T 8264-2008 "Technical Terminology for Painting" to ensure uniform parameter expression.

The upcoming GB 46759-2025 "Safety Specification for Electrophoretic Painting" (effective from August 1, 2026) will for the first time systematically stipulate the electrical safety, protection functions, and energy efficiency requirements of electrophoretic power supplies, covering seven layers of protection such as overvoltage, overcurrent, phase loss, and abnormal water pressure, with a response time of ≤ 200ms.

Application scenario adaptation

Automobile manufacturing: requires high stability, low ripple, water-cooled high-power power supply, supports whole line automation control, and ensures the uniformity of the anti-corrosion film thickness of the vehicle body within ± 1 μ m.

Hardware and small parts coating: desktop three constant power supply can be selected, with a voltage range of 4-1000V, supporting multi slot parallel connection, meeting the flexible production of multiple varieties and small batches.

Laboratory research: Using low-power (<300W) equipment with program storage, automatic shutdown, and LCD touch, suitable for electrophoretic paint performance testing and process development.