MCE has an extensive line of standard parts including High Frequency (HF) chokes. However, standard HF transformers have been very limited. There are several reasons for this. The technology has been advancing very rapidly. Transformers have many more variables such as input voltage, frequency, and a multitude of secondary voltage and current combinations.
A STANDARD ANSWER TO CUSTOM REQUIREMENTS
A three step program is offered to satisfy customer requirements. These are:
- Employ Computer Aided Designs which can be accomplished rapidly and inexpensively.
- Stock a variety of cores and bobbins especially suited for HF Transformers.
- Provide rapid turn around on prototypes or engineering samples. Extra materials such as alternate cores or gap stock can be supplied to enable design engineers to “fine tune” the part in the actual circuit when required.
- The majority of ferrite cores stocked are primarily the “E” and “EP” cores. There are a greater variety of bobbins available direct from the bobbin manufacturers. Existing packaging (cups, etc.) and tooling can be used.
- PC bobbins for horizontal cores are the preferred choice. These provide many advantages. All of the pins can be utilized without concern for ½ turn problems. They also permit specific winding techniques to obtain good magnetic coupling.
- It is very important that pin assignments for PC bobbins be negotiated. From a manufacturing standpoint, the pin assignments can significantly affect reliability, performance, and cost.
- MCE has also developed several special techniques to comply with I.E.C. and UL safety requirements using standard bobbins and cores.
- Insulation systems up to class F, 155°C are available.