Application of FGI high-voltage frequency converters in tin plating softening

In the continuous electroplating of tin strip, reflow is an important process, which is generally divided into high-frequency induction reflow, power frequency resistance reflow, power frequency resistance plus high-frequency induction combined reflow, and variable frequency resistance reflow.

High-frequency induction melting uses high-frequency induction heating to melt steel strips, but its disadvantages include high investment costs and susceptibility to damage to high-frequency components. Power frequency resistance melting uses a three-phase to single-phase transformer to obtain single-phase AC power, which easily leads to problems such as grid current imbalance, grid pollution, high equipment losses, low power factor, and high harmonic content. However, using a variable frequency resistance melting power supply can effectively solve these problems, and by changing the power supply frequency (above 50Hz), it can effectively eliminate wood grain defects in low-tin-weight tin-plated boards. Therefore, variable frequency resistance melting is widely used in electroplating tin production lines.

Implementation Plan

Based on the user's on-site operating conditions, a high-power, high-efficiency, energy-saving soft fuse power supply system based on high-voltage frequency conversion technology is provided. This system includes a power unit cabinet and a control cabinet. The power unit cabinet contains three-phase power units, and the control cabinet contains a controller connected to the incoming line cabinet, power unit cabinet, and outgoing line cabinet.

By adopting a one-to-one automatic method, it can ensure that the power frequency is automatically switched when the frequency converter fails, so that the load does not stop. It can also avoid the entire production line from being shut down due to a single point of failure of the frequency converter, extend the overall life of the equipment, and reduce unplanned downtime losses.