source:Industry News Popular:adapter release time:2022-05-14 09:24:55 Article author:yu
Semiconductors, power diodes, etc. are components that are easily heated in use, and switching power supplies are no exception. The main heating components of switching power supplies are semiconductor switching tubes, power diodes, high-frequency transformers, and filter inductors. Different devices have different methods of controlling heat generation. The power tube is one of the devices with larger heat generation in the high frequency switching power supply. Reducing its heat generation can not only improve the reliability of the power tube, but also improve the reliability of the switching power supply and improve the mean time between failures.
From this point of view, the heating of the switching power supply transformer is due to the heating of the switching tube, and the heating of the switching tube is caused by the loss, and the loss of the switching tube is composed of the switching process loss and the on-state loss. The following methods.
Method 1. More importantly, the loss can be reduced by designing a better control method and buffering technology. For example, the soft switching technology can be used to greatly reduce the loss.
Method 2: For the loss caused by high-frequency magnetic materials, the skin effect should be avoided as much as possible. For the influence caused by the skin effect, the method of winding multiple strands of thin enameled wires in parallel can be used to solve the problem.
Method 3: Reduce the on-state loss The on-state loss can be reduced by selecting a switch tube with low on-state resistance.
Method 4: For the rectification of the secondary side of the transformer, a more efficient synchronous rectification technology can be selected to reduce the loss.
Method 5. The switching loss is caused by the size of the gate charge and the switching time. To reduce the switching loss, a device with a faster switching speed and a shorter recovery time can be selected to reduce the switching loss.
Method 6: Reduce the heat generation of the power diode. Generally, there is no better control technology to reduce the loss of the AC rectifier and snubber diode. The loss can be reduced by selecting a high-quality diode.
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