Temperature Rise

     

Toroidal Transformers generate heat due to the losses within the energy conversion processes. A typical graph of temperature rise versus power consumption would be as shown below. (Pout=Actual Power Output, Pnom=Nominal Power Rating)

These losses may be split into two main components :

Core Losses

The toroidal core is strip-wound using the highest grades of 'Grain Oriented Silicon Steel' (G.O.S.S.) The high grade of steel exhibits very low losses, typically 1 Watt per Kilogram of steel.
Typical figures for core losses would be as follows :

VA Rating
[VA]
Core Losses
[Watts]
15
30
50
80
0.21
0.26
0.43
0.51
120
160
225
300
0.76
0.97
1.3
1.7
500
625
800
1000
2.5
3.1
3.8
4.8

Copper Losses

The main source of losses in a toroidal transformer are Copper losses, and they arise from the resistance of the copper wire used in the windings. The losses (P) can be calculated from the equation P=I*I*R
(commonly know as 'I squared R loss') where I is the current flowing in the winding, and R is the DC resistance of the winding.
Typical copper losses are as follows:

VA Rating
[VA]
Copper Losses
[Watts]
15
30
50
80
2.5
5.0
6.6
11.8
120
160
225
300
13.9
20.8
21.3
22.5
500
625
800
1000
31.0
39.0
41.0
43.0

Click here for 'Custom Designed' page
Click here for 'Applications' page 
Click Here to email an inquiry

 

Home      About Us     Products      Quality      Sales      Distribution      News