The current through the primary pcb Transformer has saturated the core. From the perspective of energy transfer, the primary energy cannot be transferred to the secondary. In the same way, if it is a coil, the self-inductance will be greatly reduced or even disappeared in the saturated state. The inductance will be reduced or even disappeared, and the remaining is the dc resistance of the coil. Of course, the passing current will increase, leading to the over-current damage of the connected device.
1- primary side of transformer generates heat or even explodes.
2- the transformer does not work.
3- transformer due to open circuit burn MOSFET even circuit board.
4- due to transformer saturation, the actual power of the customer's products cannot reach the designed power.
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Power Supply Transformer Made in China, such as EFD Transformer, ee16 transformer.
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