asteriskHelp - Toroid Design Tool

Using the tool - Inductor Design

  1. Click numbers then press the button for the data field you wish to update. For example, enter "2.0" then press the L button to specify the desired inductance in microHenries.
  2. You can specify inductance or number of turns, AC and DC currents and operating frequency. Use the RND key to round the TURNS entry to the closest integer.
  3. Use the select menus to choose the toroid core size, core material and wire size. Core sizes are approximately specified in hundredths of an inch, for example size 50 core has a 0.5 inch diameter. Core material is specified by vendor material mix numbers along with permeability and type indicator. Type indicator T implies iron powder while FT indicates ferrite material. Wire size determines the maximum current the design can handle
  4. A design report is presented at the bottom of the page. The report summarizes the current design. You want to verify that the design is realizable by comparing design parameters with the maximum limits listed in the report. Use the checklist below to verify a realizable design.

Checking the design

You need to assess if your design is realizable and practical by checking the design report at the bottom of the page.

Using the tool - Transmission Line Transformer Design

A Transmission Line Transformer (TLT) is a toriod core wound with a twisted pair. The TLT offers wide bandwidth and higher power capability. By virtue of the twisted pair, the turns ratio of a TLT is 1 : 1.

  1. Specify the minimum frequency (-3db lower limit) of the transformer by clicking the numbers in MHz and then pressing the "F" key.
  2. Specify the AC and DC currents for one of the wires by clicking the numbers in Amps and then pressing the "IAC" or "IDC" keys.
  3. View the report at the bottom of the page. You will probably need to select a different wire size to meet the IAC + IDC requirements, a different core material (such as type 43) to reduce the required turns, and a larger core size to accomodate the number of required turns.

Checking the design

You need to assess if your design is realizable and practical by checking the design report at the bottom of the page.