%For an example and help, go to www.thayer.dartmouth.edu/inductor/litzopt or refer to winding data for use with litzopt.%Please replace the question marks with the pertinent data and leave all else alone....

%There are 2 windings in your transformer.

%Resistivity (1.77e-8 is for room temperature
copper)

rhoc =1.77e-8;
%
[ohm-meters]

%Perform optimization on designs with wire sizes
ranging from American Wire Gauge strand size (32 to 48 is the default)

awg =
[32:2:48]; %

%Average turn length for each winding ... 2 elements
are required in this vector.

len =[ 97.3e-3
97.3e-3];
%

%Duration of each time segment ... 100 elements
are required in this vector.

divisions=100;

f=150e3;
%
150 Khz

period=1/f;

inc=period/divisions;

dt =inc*ones(1,divisions);

%Current at the end of the last interval is assumed
equal to the first current value.

%Current values
for winding 1 at the beginning of each time segment ... 101 elements are
required in this

vector.

A=8*sqrt(2);
%
Waveform Amplitude

t=[0:inc:period-inc];

w=2*pi*f;

I(1,:)=A*sin(w.*t);

%Current at the end of the last interval is assumed equal to the first current value.

%Current values for winding 2 at the beginning
of each time segment ... 101 elements are required in this

vector.

I(2,:)= -I(1,:);

%Number of turns in each winding... 2 elements
are required in this vector.

N=[
30
30]; %[turns]

%Breadth of the winding window in meters.

bw=0.0446;

gap='No Gap';

32 0.03059 42.57 5.051 5.051

34 0.04906 27.91 12.53 12.53

36 0.07962 18.56 30.96 30.96

38 0.1327 12.53 76.53 76.53

40 0.2331 8.602 190.4 190.4

42 0.4485 6.084 473.3 473.3

44 1 4.515 1130 1130

46 2.824 3.489 2508 2508

48 10.44 2.744 5253 5253

A typical data file is shown below for a 7-turn to 49-turn gapped flyback transformer core with a triangular excitation of 260 kHz with 11.4 A peak current in the primary winding and 1.6 A peak current in the secondary winding (further detail is available regarding this transformer here). The integral of B squared values are obtained from an external simulations. All generated text appears in gray and data entered into the generated data file is displayed in red. Data that is optional to change appears in blue.

%For an example and help, go to www.thayer.dartmouth.edu/inductor/litzopt, or refer to winding data for use with litzopt.

%Please replace the question marks with the pertinent data and leave all else alone....

%There are 2 windings in your transformer

%Resistivity (1.77e-8 is for room temperature
copper)

rhoc =1.77e-8;
%
[ohm-meters]

%Perform optimization on designs with wire sizes
ranging from American Wire Gauge strand size (32 to 48 is the default)

awg =
[32:2:48]; %

%Average turn length for each winding...

len =[ 3.79e-2
5.08e-2 ];
%[meters]

%Duration
of each time segment ... 3 elements are required in this vector

dt = [3.8e-6
.07e-6 3.9e-6];

%Current values for winding 1 at the beginning
of each time segment ... 3 elements are required in this vector.

I(1,:)=[0
11.4 0 ];

%Current at the end of the last interval is assumed equal to the first current value

%Current values for winding 2 at the beginning
of each time segment

I(2,:)=
[0 0 -11.4/7
]; %[amperes]

%Volume of each winding...

vol=[ 0.0821
0.2480 ].*1e-5;
%[cubic
meters]

%Number of turns in each winding...

N=[ 7
49 ]; %[turns]

%Integral of Bsquared values from simulation with
current in winding 1

% Enter
integral of B squared over winding 1

int_B2(1,1,1)=7.3875e-015;
%[T^2-m^3
]

% Enter integral of B squared over winding 2

int_B2(1,1,2)=2.7289e-015;
%[T^2-m^3
]

%Integral of B squared values from simulation with current in winding 1 and 2

% Enter integral
of B squared over winding 1

int_B2(1,2,1)=
1.3110e-015; %[T^2-m^3
]

% Enter integral of B squared over winding 2

int_B2(1,2,2)=3.3920e-015;
%[T^2-m^3
]

%Integral of Bsquared values from simulation with current in winding 2

% Enter integral
of B squared over winding 1

int_B2(2,2,1)=1.0290e-014;
%[T^2-m^3
]

% Enter
integral of B squared over winding 2

int_B2(2,2,2)=6.4625e-015;
%[T^2-m^3
]

for Winding 1 for Winding 2

32 0.03059
5.942
0.5236
0.1585

34 0.04906
3.896
1.299
0.3932

36 0.07962
2.591
3.209
0.9715

38 0.1327
1.749
7.933
2.402

40 0.2331
1.201
19.74
5.975

42 0.4485
0.8492
49.06
14.85

44 1
0.6302
117.2
35.47

46 2.824
0.487
260
78.71

48 10.44
0.383
544.5
164.8