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Switching power supply transformer leakage inductance of the how to measure

Writer:www.turnmax-tech.comSource:东莞市腾茂电子有限公司 Date:2016-11-10

Switching power supply transformer leakage inductance of the how to measure, any leakage inductance of the transformer to have, just different from the strong and the weak, and the leakage inductance is related to the switching power supply transformer whether can use results in maximum, then under the small make up to introduce the calculation method of the leakage inductance of the transformer switch power supply:

EP17 switch power transformer at the bottom of the figure
 
A, switching power supply transformer leakage inductance
 
Any leakage inductance of the transformer is present, but the switch of the transformer leakage inductance of the impact on the performance of switch power supply is particularly important. As a result of the existence of leakage inductance of the transformer switch, when the control switch moment can produce counter electromotive force, easy to switch device over-voltage breakdown; The leakage inductance can also with the circuit of the distributed capacitance and the composition of the distributed capacitance of transformer coil oscillation circuit, the circuit to generate oscillation and electromagnetic energy outward radiation, electromagnetic interference. As a result, the leakage inductance of the analysis of principle and reduce the leakage inductance of the produce is also one of the important content of switching transformer design.
EP17 profile switching power supply transformer
 
Switch between the leakage inductance of the transformer coil, because of magnetic flux leakage between coil; Therefore, to calculate the magnetic flux leakage between the coil, the value of the leakage inductance can be calculated. To calculate the transformer coil between the magnetic flux leakage, the first is to know the magnetic field distribution between two coils.
 
We know that the spiral coil in the magnetic field distribution and electric field distribution in two pieces of plate some similarities, that spiral coil in the magnetic field intensity distribution is the basic uniform, and magnetic energy is focused on the basic of spiral coil. In addition, in the computation of the spiral coil within or outside of the magnetic field strength distribution, the more complex situation maxwell theorem or bi - sand theorem are available, and the circumstances of a comparatively simple and usable and ampere loop law or law of magnetic circuit and hoff.
 
EP17 switching power supply transformer vertical view
 
Second, the switching power supply transformer leakage inductance of the correct test method
 
The switching power supply transformer secondary winding short circuit, and then test its primary winding inductance, is the leakage inductance.
 

 

Above is the measuring method of switch power supply, the leakage inductance of the transformer, the method for measuring calculating the leakage inductance of the transformer switch power supply has a very high accuracy, of course, if you have experience more easily calculated.
 
 
 

TypeInfo: Corporate News

Keywords for the information:开关电源适配器