Butler Winding designs and manufactures Bobbin Wound Inductors for a variety of power supply and power conversion applications.

A Bobbin Wound Inductor is a inductor that is designed with the coil wound on a coil form or “bobbin”. The core structure is then mounted to the bobbin. Bobbin wound Inductors can be designed to operate from 60Hz, or line frequency, well into the MHz range.

Where are Bobbin Wound Inductors found?

• Switch mode power supplies.
• Power conversion applications.
• Filter circuits
• Any application that the inductor can be designed on a bobbin or coil form.

Design upper limits of a Bobbin Wound Inductor

• Typical minimum requirements to be specified for a Bobbin Wound Inductor are:   
  • Power rating in VA.
  • Operating frequency in Hz. Operating frequency is needed for core calculations and wire sizing.
  • Operating current levels, DC in Amperes and AC in Amperes peak to peak.
  • No load inductance in uH.
  • Full load inductance in uH.
  • Operating frequency is needed for core calculations and wire sizing.
• Core material is selected for the known operating frequency or frequencies which can be anything from silicon steel laminations to a ferrite core structure.
• Other bobbin wound inductor design considerations are space limitations and mounting technique.
• Lead terminations, if needed, may also be specified through the design of a Bobbin Wound Inductor.

Bobbin wound inductor designs vary widely in terms of power rating, voltage and current levels, operating frequency, size, impedance, bandwidth (frequency response), packaging, winding capacitance, and other parameters.