100kHz Half Bridge Convertor - SG3525
This is a SMPS Circuit improved over the Application Note in the book SGS Motion Control Application Manual. This worked well. It helps you learn more about High Frequency Power Supply Design. More details and PCB's Here SG3525 SMPS Project.
This was the Module that contained the smps chip. It was done to prevent easy replication by other firms. Also to Keep the Signals isolated from the Main board board currents and Corrosion Prevention by impregnating Module in Epoxy. Yet the main board suffered some corrosion even with some coating protection.
SG3525Voltage Mode PWM
Industrial Systems that involve processes like Etching, Coating and Electroplating have to be well ventilated so that electronics around them have some life.
Read about SG2525 - SG3525 - PWM SMPS Regulator Chip.
Else find ways to package Electronics in Sealed Enclosures with a new plan for Heat Dissipation.