A method for reducing the switching power supply transformer's excessive temperature rise
In the actual application procedure, the MOS tube of the power transformer and the transformer's design both frequently experience an extreme temperature rise. Today, we'll start with these two factors to examine how we may properly address the switching power supply transformer's temperature rise. high concern.
The MOS tube of the power transformer and the transformer design itself frequently experience an extreme temperature rise during the actual application procedure. In order to successfully address the switching power supply transformer's temperature rise, we will today start with these two factors. excessively high.
First off, from the viewpoint of the transformer itself, when the temperature increases too much and heat is produced, there are four primary causes, including copper loss, winding process issues, transformer iron loss, and inadequate transformer design power. No-load heating is brought on by a transformer's damaged insulation or a high input voltage. The coil must be rewound if the insulation is destroyed. If the input voltage is too high, it must be lowered or the coil's number of spins must be raised.If the voltage is normal, but it becomes hot when the load is on, it means that the load of the power transformer is too large, and its load design needs to be changed.
The most significant source of heat generation in the design of switching power supply transformers is generated by MOS tubes, and losses are to blame for the issue of an excessive temperature rise. The switching process loss and the on-state loss make up the MOS tube's total loss. By choosing a switch tube with a low on-state resistance, the on-state loss can be decreased. Gate charge and switching time are the two factors that contribute to switching process loss. Yes, by choosing devices with a faster switching speed and a quicker recovery time, the switching process loss can be reduced.But what is more important is to reduce the loss by designing a better control method and buffer technology, such as using soft switching technology, which can greatly reduce this loss.
Another potential reason why the power transformer's internal temperature rise could be excessive is that the transformer is getting older. It is required to do a thorough assessment based on the working duration and working life of the transformer once the engineer has examined the transformer and the MOS tube and found no anomalies.
