lord loh.
Member
AN original Nokia charger is rated for 700mA. And the transformer inside it is minuscule. Even my large transformers (iron core) heat up. How are such high capacities achieved.
I understand that ferrite cores reduce eddy loss and thus reduce heating. But small ferrite cores are used only for high frequency transformers. And I am certain that there is no SMPS in the mobile chargers.
To achieve 700mA, a thick copper wire winding in the secondary is required. How are all these features fixed into such a small transformer?
I understand that ferrite cores reduce eddy loss and thus reduce heating. But small ferrite cores are used only for high frequency transformers. And I am certain that there is no SMPS in the mobile chargers.
To achieve 700mA, a thick copper wire winding in the secondary is required. How are all these features fixed into such a small transformer?