If the reverse leakage current of the freewheeling diode in the switching power supply is too large, will it cause thermal failure of the diode?

小太阳yy

If the reverse leakage current of the freewheeling diode in the switching power supply is too large, will it cause thermal failure of the diode? [Copy link]

 

maychang

The loss of the freewheeling diode in the switching power supply can be divided into several parts: forward conduction loss, switching loss, reverse leakage loss... Among them, the reverse leakage loss is the smallest. The reverse leakage loss can be calculated based on the reverse leakage current in the datasheet.

小太阳yy

maychang published on 2023-11-26 19:43 The loss of the freewheeling diode in the switching power supply can be divided into several parts: forward conduction loss, switching loss, reverse leakage loss... Among them, the reverse...

I know how to calculate the forward conduction loss, but how do I calculate the switching loss of a diode?

maychang

Xiaoyangyy posted on 2023-11-26 20:02 I know how to calculate the forward conduction loss, but how do I calculate the switching loss of a diode?

Switching loss is difficult to calculate. In the past, the loss was measured by measuring the instantaneous voltage and current product using an oscilloscope.

通途科技

If the reverse leakage current of the freewheeling diode in the switching power supply is too large, it will cause the diode to fail thermally. As the reverse leakage current increases, the heat generated by the diode will also increase. If the diode works under a large reverse leakage current for a long time, it may fail.

fjdeepblue

If the reverse leakage current of the freewheeling diode in the switching power supply is too large, it will cause increased power consumption and may cause damage.

qwqwqw2088

Reverse leakage is uA level loss and is very small under normal circumstances

qwqwqw2088

Of course, it goes without saying that it is a freewheeling diode, even if it is a diode for other normal purposes,,,

A normal diode PN junction is damaged, resulting in leakage, which is caused by improper use, such as applying a high reverse voltage, which will eventually cause heat and failure.