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$ u7 n' ^: U1 z9 S" g | PCB layer transformers* k0 Q- M1 p- o! w( L1 w( g
| General
7 b; h; Y' G1 C1 z3 T | 60601-1(ed.2);am1;am2
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) _( y7 E4 o- x& |; W0 ZStandard(s)- (year and edition):" w3 ^7 x- T: |: T/ \
IEC 60601-1:1988 Ed.2
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' X2 k" h* _, J6 U% LSub clause(s):
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Sheet n°: 537
1 ~3 q6 P- @$ i) j! P, hSubject:! T( X# b# q' }1 ` s3 ~
PCB layer transformers,
g4 z, m! b" T$ u1 \, ?- L9 k2 p* }Key words:
& m- G8 P' Z2 H! M% i$ W" r0 JPCB layer transformers
2 h9 k A F' O' F8 vDecision taken at the 40th9 ?* i8 X* \. r* P
meeting 2003
, a2 ?+ {; b* R) j4 k8 FQuestion:! T8 B* K/ j0 i, p5 ^0 q! y- c
What requirements are needed for PCB layer transformers using etched windings?) a+ g, z' p+ N; E$ B; h9 @
Decision:
# H# I" k3 p$ o, J" cThe requirements of the IEC 60601:1988 Ed.2 should be used with regard to creepage distances and$ m5 n7 a3 ^6 |! @# d
isolation distances through thickness.
+ o6 N j. C2 ^% @$ r! W5 mExplanatory notes:
1 t6 m, h& N/ L: |; ]) ?% NThis issue will be put forward to TC 66 and TC62 to deal with this specific problem. In the meantime a
7 ?* r* Z. F# V) k7 ^; o Stemperature cycling test according to IEC 60950 can be used for reference. Base for this test are the
' q) a0 i! t/ V: X I6 x |temperatures retrieved during normal condition tests calculated/adjusted to an ambient of 40 °C. It is3 K" ]+ g6 w9 ~, E; u, |
important that the influence of the temperature of other components shall be taken into consideration.
0 Z9 d& U3 e+ a& ?+ j2 tThe minimum thickness through insulation can be taken as from IEC 60950, being 0,4 mm.
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