How to suppress the high temperature transformer temperature rise? The problem is basically that every person who uses a high-frequency transformer will feel irritated, and people are very worried that the temperature of a high-frequency transformer will be too high. What should we do to suppress the temperature rise of high-frequency transformers? Next, we will answer this question for you.
EI50 high frequency transformer vertical
(1) Suppression of core loss
Core loss is often found by looking up the table. Note that the loss increases rapidly with increasing magnetic flux density. Although it is theoretically possible to reduce losses by reducing the magnetic flux density, this is inconsistent with maintaining high efficiency of the transformer. The only way to reduce the loss under flux given conditions is to increase the effective cross-sectional area of ​​the core, but this will increase the volume of the core. As the volume increases, the thickness of the magnetic core also increases, the thermal resistance of the magnetic core will increase, and eventually the temperature of the magnetic core will increase.
Jinhao Technology High-frequency Transformer
Like low-frequency transformers, saturation flux density in high-frequency transformers is also a decisive factor in the volume of the magnetic core. The optimal design of the transformer should have the maximum operating flux density, the smallest core volume and the largest effective core cross-sectional area, and the highest working efficiency, minimum leakage inductance, minimal loss and temperature rise.
(2) suppress winding loss
The effect of AC impedance must be considered in high-frequency transformers. Unlike in the case of DC or low frequency, there will be skin effect and proximity effect in the winding under high frequency conditions. Therefore, the thicker the wire diameter, the greater the AC impedance. . In this case, it is preferable to use a flat winding, but the winding must be parallel to the direction of the magnetic flux, and the number of layers should not be too large, otherwise eddy current loss will be caused. Note that the flat winding must be far from the air gap or it will be affected by the fringing flux. The proximity effect has a very significant effect on the multilayer flat winding and the resulting losses will be nearly 100 times that at normal levels. In this case, the use of the Litz line is not very useful. Because Litz wire winding is more difficult, and the winding factor is very low. If used improperly, it will cause a significant increase in loss.
Windings outside the transformer not only increase parasitic impedance and losses but also generate EMI. So try to arrange the winding inside the core.
Floating Ball Level Controller
The floating ball liquid level controller is composed of floating ball, plug rod, etc. It is installed on the top of the container through the connecting flange, and the floating ball floats on the liquid level according to the principle of equal volume of liquid. When the liquid level of the container changes, the floating ball also moves up and down. Due to the magnetic effect, the dry spring of the floating ball liquid level controller is magnetically attracted to change the liquid level position into an electrical signal, and the actual position of the liquid is digitally displayed through the display instrument, Floating ball liquid level controller to achieve remote detection and control of liquid level.
The floating ball liquid level controller is designed according to Archimedes' buoyancy principle. When the liquid level of the container changes, the floating ball also moves up and down. Due to the magnetic effect, the dry reed of the floating ball liquid level controller is magnetically attracted, so that the resistance in the sensor changes linearly, and then the converter converts the change of the resistance value into 4mA ~ 20mA standard DC signal output, Realize the remote detection and control of liquid level.
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