The method of reducing the loss of switching power supply transformer
Two aspects of reducing losses in switching power transformer designs.
1. Reduce copper loss (transformer loss)
1. Use 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. Use it with caution when the copper loss is significantly higher than the iron loss;
3. Change the transformer process to reduce the AC resistance of the winding. The main methods are to reduce the diameter of the copper wire (the total cross-sectional area cannot be reduced), increase the adjacent surface of the primary and secondary (will increase the distributed capacitance of the primary and secondary), and reduce the distance between the primary and secondary Increase the primary and secondary distributed capacitance), coil sparse Rao, etc.;
4. Change the working parameters of the circuit to reduce the AC resistance, such as reducing the switching frequency, but it will increase the magnetic flux density of the magnetic 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 wires (not realistic).
2. Reduce iron loss
1. Use core materials 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 an increase in copper loss, so 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 design, using the valley value in the temperature and loss curve of the core material;
3. Comprehensive method
The method of reducing the loss of switching power supply transformer
1. According to the respective heat dissipation conditions, reasonably allocate the copper loss and iron loss ratio;
2. Reasonably design the magnetic flux density and operating frequency of the magnetic core to make the magnetic core work in the best FB combination state.
