DSH 537 PCB layer transformers

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DSH 537 ; e# W4 F* k! ?1 [2 k2 s+ T+ ~

PCB layer transformers

General ; I* I$ _1 R9 ~; H+ ~9 A

60601-1(ed.2);am1;am2

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Standard(s)- (year and edition):
IEC 60601-1:1988 Ed.2
Am1+Am2
Sub clause(s):
General
4 H$ w( d0 u) U7 }& r- F. _7 }# jSheet n°: 537
Subject:
' F5 T+ ^. J3 ^9 h1 U5 x# ^PCB layer transformers,
/ }2 F' x0 M# pKey words:
& S' R0 l8 ?- r1 vPCB layer transformers
Decision taken at the 40th
+ r. v/ a& ^& x3 v5 S, E$ pmeeting 2003
3 q- j; W( n* ~8 kQuestion:
7 n1 k$ I( O: T1 AWhat requirements are needed for PCB layer transformers using etched windings?
7 ~1 }7 f/ M, p8 j5 R& [& QDecision:
The requirements of the IEC 60601:1988 Ed.2 should be used with regard to creepage distances and
- w; \; ?4 W1 V$ Wisolation distances through thickness.
4 W  Y6 h% A7 ?! l% nExplanatory notes:
8 D+ ]) Q1 R& s2 E, l7 Y! HThis issue will be put forward to TC 66 and TC62 to deal with this specific problem. In the meantime a
temperature cycling test according to IEC 60950 can be used for reference. Base for this test are the
2 A/ ^5 A  a5 w. [1 rtemperatures retrieved during normal condition tests calculated/adjusted to an ambient of 40 °C. It is
/ n+ F) Q) L( }' jimportant that the influence of the temperature of other components shall be taken into consideration.
; @( G- Z5 ^( n: d8 [$ ]The minimum thickness through insulation can be taken as from IEC 60950, being 0,4 mm.

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