Today, they are almost exclusively used for switch mode power supplies (SMPS), specifically low power (< 100W), low cost switch mode power supplies. These power supplies are used in a wide variety of applications and industries, pool & spa, oil exploration, lighting, fire & securities, computers and battery chargers to name a few.
CET Technology was contracted by a client to design and build a flyback transformer for a switch mode power supply to generate 12VDC in a spa control box. The customer’s original transformer had too high of a leakage inductance that induced noise in the regulation of the power supply. The noise was so substantial that the output ripple became excessive to where the power supply would fail to operate correctly. CET redesigned the transformer by changing the winding method to produce a lower leakage inductance. It was a challenging project in that the transformer had to run over a wide range of output power levels and input voltages.
Due to the urgency of the project, CET was able to offer fast turn-around on the design and prototype. Subsequently, the customer placed a blanket order. CET maintains inventory at their New Hampshire facility on behalf of the customer for a Kanban scheme.