Primary Input Voltage in Vrms = 240 VPrimary Input Current in Irms = A (Optional)

Secondary Output Voltage in Vrms = 19.3 VSecondary Output Current in Irms = 10.95 A

Transformer Effieciency = 0.9 (Assumption)

Transformer VA Rating = 234.82

Primary Current = 0.98 (A) > Calculate here if the primary input current is unknown.> Select primary wire gauge for 200A/sq.cm Pg 336

Assuming transformer operate at continuously, C = 1.2= 18.39 sq.cm

Stacking Factor = 0.9 (Assumption)

= 20.43 sq.cm

For square type core,Core width = 4.52 cm

Turns per volt =

where V - voltage across the winding in volts r.m.sF - form factor of the a.c waveformf - frequency in Hza - cross-sectional area of the coreN - number of turns of considered windingB - flux density in maxwell per unit area

= 50 Hz= 1.1 (For sine wave)= 11500 (For CRGO core metal stamping)

Turns per volt = 2.15

Number of turns in primary = 515.88Number of turns in secondary = 45.633

* Determine wire size according to SWG or AWG TablePrimary wire gauge = 137 (turns/sq. cm)Secondary wire gauge = 12.8 (turns/sq. cm)

* Determine window area according to SWG or AWG TableArea occupied by primary = 3.77 sq. cmArea occupied by secondary = 3.57 sq. cm

Core Area, a

Gross core area, A

Operation frequency, fForm factor, FFlux Density, B

NV

=108

4 FfaB

Total area occupied by windings = 7.33 sq. cm must be 15.32 sq. cm

> Calculate here if the primary input current is unknown.> Select primary wire gauge for 200A/sq.cm Pg 336

Waste Free Core Dimension Design

13.56

2.26 2.2611.30 4.52 6.78

* in cm* according to Core Proportions Table (Pg 77)

(Pass)

Transmissible Power,

where K - operating waveform constantf - operating frequency

J - Current density of wire (amp/cm²)Kw - window area utilisation factorAw - window area of core (cm²)Ac - Core area (cm²)

Primary Input Voltage in Vrms = 240 VPrimary Input Current in Irms = A (Optional)

Secondary Output Voltage in Vrms = 24 VSecondary Output Current in Irms = 10 A

Primary current = 0.79 > Calculate here if the primary input current is unknown.> Select primary wire gauge for 400A/sq.cm Pg 200

Input VA = 377.12Output VA = 240.00

Transformer Efficiency = 0.90 (Assumption)

Transmissible Power, P = 308.56

Maximum Flux Density, Bm = 0.20 Wb/m² (Typical 0.2 - 0.3)Current Density of Wire, J = 400.00 Amp/cm²Window Area Utilisation Factor, Kw = 0.50 (Typical 0.4 - 0.5)Circuit Constant, K = 2.20Circuit Constant, K1 = 6.28Operating Frequency, f = 50 HzCore area, Ac = 0.255 cm²Window Area of Core, Aw = 0.25 cm²

Area Product, = 701.28 > Check for suitable coredimension at Pg 326

Turns per volt, = 624.14

Primary Turns = 299585.78Secondary Turns = 14979.29

Winding Area Required = Total no. of turnsTurns per cm²

Primary turns per cm² =

Bm - Maximum flux density swing of the core material (Wb/m²)

(Refer to Enamelled Copper Wire SWG Table

(Depends on circuitry, refer book (Depends on circuitry, refer book

(Refer Dimension of Ferrite Cores (Refer Dimension of Ferrite Cores

(Refer to Enamelled Copper Wire SWG Table

P= K . f .Bm .J .Kw . Aw . Ac104

Ap=(Aw×Ac ) cm4

TV

=1

K 1 . f .Bm . Ac×10−4

Secondary turns per cm² =

Primary Winding Area = #DIV/0!Secondary Winding Area = #DIV/0!

Checking: Bmax = 0.02 (Within Limit)Total window area required = #DIV/0! #DIV/0!

(Refer to Enamelled Copper Wire SWG Table

> Calculate here if the primary input current is unknown.

(Typical 0.2 - 0.3)

(Typical 0.4 - 0.5)

> Check for suitable coredimension at Pg 326

(Refer to Enamelled Copper Wire SWG Table Pg 200)

(Depends on circuitry, refer book Pg 196)(Depends on circuitry, refer book Pg 196)

(Refer Dimension of Ferrite Cores Pg 326)(Refer Dimension of Ferrite Cores Pg 326)

(Refer to Enamelled Copper Wire SWG Table Pg 200)

(Refer to Enamelled Copper Wire SWG Table Pg 200)