I am sure that what they are trying to state (or restate) is the power
dissipation limit of the inductor, assuming it is passing DC. Since the
winding has resistance, running current through the winding will cause the
usual I²R loss. The inductor is able to dissipate only a certain amount of
power without overheating.
Once the inductor is in a circuit, it is easier to measure the voltage
across it rather than the current through it, so perhaps this is the reason
for the statement.
In filter circuits, the voltage drop across the inductor may be many times
this voltage, though the current limit would still apply.
Don Borowski
Schweitzer Engineering Labs
Pullman, WA, USA
Kbalasubramanian@
SCMMICRO.CO.IN
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10/12/2006 08:53 Subject
AM Voltage drop across an inductor -
what is the limit?
Dear All,
In an 'Coil craft' application note it is mentioned that the
'voltage drop limit across the inductor' = Irms X ESR.
Irms : Maximum current rating of the inductor
ESR : Effective Series Resistance at the operational frequency.
In second order filters under series resonance state, certainly the voltage
appearing across an inductor will exceed this value. Does it mean that
these parts are not suitable for filter circuits? What if the voltage drop
across inductor exceeds this limit?
Sincerely
K.Balasubramanian
Project Leader - Hardware.
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