How to reduce the loss of the transformer of switching power supply？

1. Reduce copper loss (transformer loss)

1. Choose a lower current density; 2. Reduce the number of turns, but it will increase the magnetic flux density of the core and increase the iron loss. When the copper loss is significantly higher than the iron loss, use it with caution; 3. Change the transformer process to reduce the winding AC resistance. The main methods are to reduce the diameter of the copper wire (cannot reduce the total cross-sectional area), increase the primary and secondary adjacent surfaces (which will increase the primary and secondary distributed capacitance), reduce the primary and secondary distance (will increase the primary and secondary distributed capacitance), and the coil Shu Rao, etc.; 4. Change the circuit operating parameters to reduce the AC resistance, such as reducing the switching frequency, but it will increase the magnetic flux density of the core and increase the iron loss. When the copper loss is significantly higher than the iron loss, use it with caution; 5. Use Lower resistivity wire (less realistic).

2. Reduce iron loss

1. Use a magnetic core material with better power consumption parameters, such as using TDK’s PC50 material instead of PC40 material; 2. Reduce the magnetic flux density, but it will increase the number of coil turns and lead to increased copper loss, use with caution; 3. Change the circuit Parameters, such as reducing the switching frequency, but it will increase the magnetic flux density at the same time, use it with caution, and adjust the number of winding turns if necessary; 4. Reasonable thermal planning, using the valley value in the temperature and loss curve of the core material.

3. Summary method

The Method of Reducing Transformer Loss of Switching Power Supply

1. According to the respective heat dissipation conditions, reasonably distribute the proportion of copper loss and iron loss; 2. Reasonably plan the magnetic flux density and operating frequency of the magnetic core to make the magnetic core work in the best FB combination state.