DSH 548 Application of IEC 60320-1 type appliance inlets

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DSH 548   G% l7 {. R+ s( U4 P, t 0 @1 p$ B2 u# S& ~! f

Application of IEC 60320-1 type appliance inlets

1.5.2, 4.5.1 # w: i. D( N- I* e3 J

60950(ed.3)

- \4 Y! X" _; m5 X9 QStandard(s):
IEC 60950:1999
Sub clause(s):
1.5.2, 4.5.1
  g% j' k, W; [4 TDec. NO.
5 B! m2 k9 [! `6 p2 N# L+ xDSH-548
Subject:
$ ~, A; |8 h% t* w; E( U. SApplication of IEC 60320-1 type
appliance inlets
( I- s& Y8 Z% T& O% rKey words:
---
Decision taken at the 41st
4 F  Y$ ^4 e# {9 w) k9 ^! ~' aCTL meeting.
! k) A3 s( S1 W8 O/ N3 NQuestion:
Background:
An increasing number of Notebook PCs require AC Adaptors to provide output power of up to 150 W
6 I' z) P, x% ~' O3 vat an ambient of up to 40 °C (due Pentium-4 devices). Although designed with a very good efficiency,
the losses still result in high operating temperatures.
. l8 c) r' J- ?3 R+ n, j2 wProblem:
: u; K2 Q9 t( ^% YIEC 60950:99 refers in several subclauses and in Annex P to IEC 60320 series as relevant IEC
% z# _1 ?1 F5 p: c6 rcomponent standard for appliance inlets.
However, there aren't any specific temperature limits for appliance inlets specified in table 4A parts 1
+ Z! X3 c" I# f% [and 2.
9 l8 {8 q2 V9 z  R8 YThis results in a non-uniform interpretation whether:
(a) the temperature limit of external surfaces of equipment which can be touched (95 °C
for the plastic housing of the appliance inlet)
+ e7 p2 Y4 x6 I. s+ N" v0 X- NOR
7 x. s$ u6 u/ c3 Y) l+ M2 |(b) the temperature limit of IEC 60320-1 (70 °C for the pins of the appliance inlet for cold
conditions)
shall be chosen for the assessment of the maximum temperature of the appliance inlet.
. t. Z/ A- F2 ~. X# W( X; @0 cA clarification for following would be helpful:
(i) Is (only) the maximum temperature of the appliance inlet housing to be measured?
- |4 m) G/ E7 t+ }) Y  a# H. xOR
) A+ r$ {( R: q. n) @+ \(ii) Is it necessary to measure besides the temperature of accessible surfaces as well
/ K) B- q* o  G. V) F7 G  x2 pthe maximum temperature of the pins of an appliance inlet (test location as required
) W- @& v* H  n, C7 _according to IEC 60320-1)?
1 f. z2 p9 w: v& I5 HDecision:
For testing of a product incorporating IEC 60320-1 type appliance inlets, the temperature limits and
locations for temperature measurements as described in IEC 60320-1 shall apply:
• 70 °C maximum pin temperature for appliance inlet for cold conditions
+ b0 A7 r3 g' s• Test location: Base of the pin (part of the pin where it protrudes from the engagement face)
The temperature rise shall be determined at the maximum room ambient temperature as declared by
# U, T9 k5 z2 O  z( @the AC Adaptor's manufacturer.
8 M; g9 f& ^# I& S4 z
* n2 j7 ^. Z5 n! I% m* K- A
4 l! H0 V% s( T  r

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