Transformer with electrical isolation protection and power supply unit or voltage converter with a transformer of this type
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United States of America Patent
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May 20, 2003
Grant Date -
N/A
app pub date -
May 19, 2000
filing date -
May 21, 1999
priority date (Note) -
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Abstract
A invention relates to a transformer having a primary coil and a secondary coil, with a ferromagnetic core inserted in a coil former. The alternating current resistance of the primary coil (3) drops on reaching a triggering temperature (TC) which lies above the operating temperature but below the softening temperature (TW) of the coil former (6) and/or insulation of coil winding (3, 4). The coil core (5) may consist at least partially of a material with a magnetic permeability which drops when the triggering temperature (TC) is exceeded.
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