Pulse transformer calculator

Design a high-frequency transformer for push-pull, half-bridge and full-bridge converters with turns, currents, wire sizing, core loss, window fill, up to five outputs and output chokes.

Input and topology

Recommended operating flux
≈ 0.193
Timing
Switch drop

Core

1,650
103
173
210
17.819

Outputs

1/5 enabled

Output 1
Output 2
Output 3
Output 4
Output 5

Winding

Maximum single copper strand from skin depth
1.06

Detailed model

Result

97.5
Load
600
Capacity
835.6
Losses
15.19
Window
25.2

Primary

turns: 24
24
Calculated turns24
2.006
0.397
Peak current5.849
Bus current2.051
Wire5 × 0.5
Current density4.82
Dead time1.429

Losses

Core0.706
Copper1.541
Switches6.947
Diodes6

How to use this tool

Design a pulse transformer for push-pull, half-bridge, and full-bridge converters. The calculator selects turns under flux and loss constraints, supports up to five secondary windings, and estimates wire sizing, window fill, losses, and output chokes.

Steps

  1. Choose the topology, input-voltage range, switching frequency, maximum flux density, and switch-drop model.
  2. Select a core and material or enter custom Ae, Aw, le, Ve, and μe values.
  3. Add up to five outputs and enter rectifier type, voltage, current, and diode drop; results update automatically.

Useful for

  • Preliminary SMPS transformer design
  • Window-fill and parallel-strand estimation
  • Comparing push-pull, half-bridge, and full-bridge options

Limits and accuracy

  • Advanced mode accepts Steinmetz coefficients, leakage inductance, Rac/Rdc, parasitic capacitance, switching times, Coss, and thermal parameters so these effects can be included in the loss and temperature estimate.
  • Parasitic-effect fields are an engineering model driven by the entered values. Use the parameters of the actual switches, core, winding construction, and prototype measurements for a final design.

Privacy

Parameters and calculations remain in the browser. Custom cores are stored only in local browser storage.

Sources