How can the transformer of switching power supply reduce the loss
Abstract：1, choose a lower current density; 2, reduce the number of turns, 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 with caution; 3, change the transformer process to reduce winding AC resistance. The main methods are to reduce the diameter of the copper wire (can not reduce the total cross-sectional area) and increase the adjacent surface of the primary stage (will increase the distribution capacitance of the primary stage).
Method for reducing transformer losses of switching power supply
Two aspects of reducing loss in switching power transformer planning.
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 magnetic core and increase the iron loss, when the copper loss is significantly higher than the iron loss, use with caution; 3, change the transformer process to reduce winding AC resistance. The main methods are to reduce the diameter of the copper wire (can not reduce the total cross-sectional area), increase the adjacent surface of the primary stage (will increase the primary stage distribution capacitance), reduce the distance of the primary stage (will increase the primary stage distribution capacitance), and so on. 4, change the circuit operating parameters to reduce 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 with caution; 5, the use of lower resistivity wire (not realistic).
2. Reduce iron loss
1, switch to 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 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 will increase the magnetic flux density, use with caution, if necessary, cooperation winding turns adjustment; 4, reasonable thermal planning, the use of magnetic core material temperature and loss curve in the valley value.
Iii. Summary method
Method for reducing transformer losses of switching power supply
1, according to the respective heat dissipation conditions, reasonable allocation of copper and iron loss share; 2. Reasonably plan the magnetic flux density and operating frequency of the magnetic core, so that the magnetic core can work in a better FB combination.
Two aspects of reducing loss in switching power transformer planning.
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 magnetic core and increase the iron loss, when the copper loss is significantly higher than the iron loss, use with caution; 3, change the transformer process to reduce winding AC resistance. The main methods are to reduce the diameter of the copper wire (can not reduce the total cross-sectional area), increase the adjacent surface of the primary stage (will increase the primary stage distribution capacitance), reduce the distance of the primary stage (will increase the primary stage distribution capacitance), and so on. 4, change the circuit operating parameters to reduce 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 with caution; 5, the use of lower resistivity wire (not realistic).
2. Reduce iron loss
1, switch to 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 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 will increase the magnetic flux density, use with caution, if necessary, cooperation winding turns adjustment; 4, reasonable thermal planning, the use of magnetic core material temperature and loss curve in the valley value.
Iii. Summary method
Method for reducing transformer losses of switching power supply
1, according to the respective heat dissipation conditions, reasonable allocation of copper and iron loss share; 2. Reasonably plan the magnetic flux density and operating frequency of the magnetic core, so that the magnetic core can work in a better FB combination.
