Dartmouth Magnetic Component and Power Electronics Research

LitzOpt Example: Flyback Transformer

 

Data Entry Variables

References

DMA & PEG Home

 Figure 1: Sample flyback transformer to be optimized.

The data needed to optimize a flyback transformer is given below.
The optimization method selected for this example uses a two-dimensional magnetic
field simulation and standard layered winding geometry.

Flyback transformer data:

Variable
Value
Units
Temperature
25
deg. C
Maximum Achieveable Packing Factor
.3
Breadth of Core Window
20
mm
Height of Core Window
5
mm
Breadth of Bobbin Window
17.2
mm
Height of Bobbin Window
4
mm
Number of Windings
2
Number of Time Segments
3
Gap Length
1
mm
Centerpost Diameter
8.6
mm
AWG Size Range
28-48 even
Winding Wire Insulation Build
single
Location of Gap
center

 

 

 

 

 

 

 

 


 

W1
W2

Time Segments
Current
W1
W2
Microseconds
at
I, amps
I, amps
dt1
Start of dt1
End of dt1
dt2
Start of dt2
End of dt2
dt3
Start of dt3
End of dt3
 

 

 

 

 

 

 

Evaluate Original Winding Design
W1
W2

 

 

 

 

Press the submit button at the bottom of the form and the following results are returned.

First a plot of the current waveforms for each winding is displayed.

The user should confirm that the current form data entered is correct.

This is followed by a plot of the winding window showing the location of each winding

The user should confirm the winding cross section is correct.

The Buildable Design Table is displayed next.

The buildable design table presents specific design information. Each design is numbered and gives the total loss
in Watts, the relative cost and the wire size and number of strands for each winding. The design numbers
correspond to the labels on the Optimal Design Frontier, which is shown next.

The optimal design frontier plots the information given in the buildable design table. The red dashed line
indicates the optimal designs, which are not necessarily buildable due to winding area constraints. The
blue star shows the cost/loss tradoff of the original design of the component being optimized.

The last table shows the design specifications for the optimal designs.

The user should note the rounding of the wire size and number of strands.

 

To send questions or comments, please email: Jennifer.Pollock@Dartmouth.edu