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 Copper Losses 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

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