Electrolytic copper foil, a key functional raw material in the electronics manufacturing industry, is an important material for the manufacture of copper-clad laminates (CCL), printed circuit boards (PCBs).

High-frequency copper foil forming machine power supplies are mainly used in two core processes:

• Electrolytic Foil Forming Process: Copper foil is electrolytically deposited using a forming machine and cathode rollers to form rough foil.
• Post-Processing Process: The rough foil undergoes surface treatments such as pickling, roughening, curing, and blackening to improve peel strength, chemical resistance, and surface roughness.

Electrolytic Foil Forming Principle

In the electrolytic cell, a titanium roller serves as the cathode, and a titanium plate coated with precious metal oxides serves as the anode. Under the action of direct current, divalent copper ions in the copper sulfate electrolyte migrate to the surface of the cathode roller, acquire electrons, and are reduced to a copper elemental foil-like deposition layer. After continuous rotation of the cathode roller, pickling, washing, drying, and peeling, rough foil is formed.

The DC output from the power supply returns to the negative terminal via the anode plate, electrolyte, and cathode roller. Copper ions in the copper sulfate solution are reduced to copper atoms on the surface of the cathode roller, forming a copper foil.

High-Frequency Switching Power Supply Technology Principle:

Modern copper foil production machines utilize IGBT high-frequency switching power supply technology. Its workflow is as follows: The AC input voltage is rectified and filtered to obtain high-voltage DC. This is then inverted to approximately 30kHz high-frequency AC via a frequency converter. The AC voltage is then transformed to the secondary side by a high-frequency transformer and further rectified and filtered by a high-frequency rectifier to obtain the desired output voltage. The control circuit samples the output voltage and current, and after closed-loop feedback, generates a PWM signal to control the inverter circuit, ensuring stable output voltage or current.

Selection Guide:

When selecting a power supply for a copper foil production machine, the following key parameters must be provided:

• Input Voltage: Typically three-phase AC380V or AC480V
• Output Voltage Range: Based on the electrolytic cell voltage requirements (commonly 6V, 7V, 8V, etc.)
• Output Current Range: Based on capacity requirements (from hundreds of amperes to over 60kA)
• Cooling Method: Selected based on the installation environment and power rating
• Control Interface: Compatibility requirements with existing automation systems.

Modern rectifiers employing IGBT high-frequency switching technology, with their high efficiency, high precision, and high reliability, have become the preferred power supply solution for the copper foil manufacturing industry, helping China's copper foil industry seize the initiative in the global new energy wave.

The technical parameters in this article are for reference only. For specific selection, please consult our technical engineers. We will provide customized solutions based on your actual process requirements.

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