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|  DSH 548
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| Application of IEC 60320-1 type appliance inlets
1 g# \0 l- I6 R7 @ | 1.5.2, 4.5.1
: ?1 ]/ Q7 T8 L | 60950(ed.3)
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Standard(s):- t5 z" M9 s% D' ?; O
IEC 60950:1999
; u; b7 D* v6 p5 ~7 i! H6 W% NSub clause(s): ^4 j8 X" f4 i+ k V% |! F
1.5.2, 4.5.1, y( {) g( w7 |
Dec. NO.
5 K. C! Q- N, H+ A0 {DSH-5486 D7 a5 a% u1 t7 U: V" p5 E
Subject:
& b% ~" {2 d- E' V& R! @Application of IEC 60320-1 type( I' m) Y6 P# D' T1 U" R; D* Z
appliance inlets
) Y/ j# w! D! z( i2 mKey words:9 x5 g6 k8 @+ P* |
---
# y0 T& o$ J+ d- H- e0 L; S" W+ q& T! ]Decision taken at the 41st
$ R6 O4 Z! g, G7 |- M8 b* kCTL meeting.) X1 W" D5 {! }( \, G! {/ w. o
Question:. @2 |$ e0 @) E; E
Background:) Z1 d. \9 T3 A
An increasing number of Notebook PCs require AC Adaptors to provide output power of up to 150 W
W8 ]# e, Q" s# N4 Uat an ambient of up to 40 °C (due Pentium-4 devices). Although designed with a very good efficiency,6 R( t0 x+ k. l T; o5 e4 m/ j
the losses still result in high operating temperatures.: `3 m4 `: q: _/ p% q
Problem:! y# r& a/ p. }
IEC 60950:99 refers in several subclauses and in Annex P to IEC 60320 series as relevant IEC
, o' Q' o% p7 E" Z0 p* X( G) Ecomponent standard for appliance inlets.8 G, u+ _* N# N& G6 y
However, there aren't any specific temperature limits for appliance inlets specified in table 4A parts 1
8 E [3 b' O6 H- k/ X7 J# Eand 2.
# m' G4 _2 O1 l' U) Y4 Q. HThis results in a non-uniform interpretation whether:0 p% @! U& i U6 q* J1 _3 L
(a) the temperature limit of external surfaces of equipment which can be touched (95 °C
2 f& |3 D, ]$ y( Nfor the plastic housing of the appliance inlet)& E+ d1 Y& y5 H
OR) g/ Q& O) s# W" G
(b) the temperature limit of IEC 60320-1 (70 °C for the pins of the appliance inlet for cold" g3 K* D2 d4 T! I% F% c) W
conditions)- j/ d/ j" _) q
shall be chosen for the assessment of the maximum temperature of the appliance inlet.
m Y: c- [6 l6 [A clarification for following would be helpful:
" b T! l. N) `+ P1 f- C+ V& A(i) Is (only) the maximum temperature of the appliance inlet housing to be measured?$ ^, M4 h2 a5 {# x
OR
( i; p: G4 ]/ d(ii) Is it necessary to measure besides the temperature of accessible surfaces as well
& j7 q% m; D& h2 }, J0 ]the maximum temperature of the pins of an appliance inlet (test location as required# H* ^4 a: ]+ ?2 D) Z* n1 X
according to IEC 60320-1)?# K6 z* U4 p! D8 v# k* u' y7 M
Decision:
9 n, Z8 T2 Q* y% v, q) j0 ]For testing of a product incorporating IEC 60320-1 type appliance inlets, the temperature limits and/ Y4 p, \$ y o( ] y$ k d& V) P
locations for temperature measurements as described in IEC 60320-1 shall apply:# V* t) M0 W9 ]7 a2 O" I
• 70 °C maximum pin temperature for appliance inlet for cold conditions" H" D1 o/ Q$ g. ~
• Test location: Base of the pin (part of the pin where it protrudes from the engagement face)' ]3 V1 }' i5 J x, y6 l/ }
The temperature rise shall be determined at the maximum room ambient temperature as declared by9 o" \: Y4 X& y' B4 X
the AC Adaptor's manufacturer.
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