The detection method of the quality of the switching power supply transformer - the comprehensive detection and judgment of the short-circuit fault of the power transformer.
The main symptoms after the short-circuit fault of the power transformer are severe heating and abnormal output voltage of the secondary winding.
Generally, the more short-circuit points between turns inside the coil, the greater the short-circuit current, and the more serious the transformer heats up.
A simple way to detect and judge whether the power transformer has a short-circuit fault is to measure the no-load current (the test method has been introduced earlier). For transformers with short-circuit faults, the no-load current value will be much greater than 10% of the full-load current. When the short circuit is serious, the transformer will quickly heat up within tens of seconds after no-load power-on, and the iron core will feel hot when you touch it with your hand. At this time, it can be concluded that there is a short-circuit point in the transformer without measuring the no-load current.
