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|  DSH 548
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& Z( i% n* N/ }0 @" E$ l | Application of IEC 60320-1 type appliance inlets
$ a2 y/ r; {/ y8 t! t" |" V5 H) j | 1.5.2, 4.5.1
0 T2 Z# r% j; c4 {" P | 60950(ed.3)) r" H* i) T5 G) Z$ C
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+ |! E1 M% j% ^1 t+ K* o8 }3 _
Standard(s):3 i! g# z/ G% v
IEC 60950:1999" _9 o u( s- J" z6 F# p
Sub clause(s):8 @. n7 T1 y$ O* {& n) c: s
1.5.2, 4.5.1
% d; S! Y! I7 ]Dec. NO.& q( {1 P3 w2 h, w. k/ Q
DSH-548
2 \4 [- S0 w1 |2 p3 r/ VSubject:& H w) g- m0 A5 {7 z0 p& V
Application of IEC 60320-1 type$ |" t& v8 l2 \1 y
appliance inlets
; w5 a! U0 a2 D% }- b" I1 g0 LKey words:% L6 p! A2 M- }. O& f! ^/ G' a
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; \9 O5 ~+ E h3 S% c' I& FDecision taken at the 41st
0 e' C% w3 L+ l4 i/ [CTL meeting.
! k. x3 ~0 B6 \ n" W* eQuestion:
) Q7 K! h9 I" }7 k% [Background:
2 p( @( M+ ~6 j( KAn increasing number of Notebook PCs require AC Adaptors to provide output power of up to 150 W" n3 K' {' p3 g0 {$ S2 c
at an ambient of up to 40 °C (due Pentium-4 devices). Although designed with a very good efficiency,7 h( m. a- b7 Q
the losses still result in high operating temperatures.3 h/ s2 l* ?! \5 U" [
Problem:! P5 V5 H! s4 y% W3 q
IEC 60950:99 refers in several subclauses and in Annex P to IEC 60320 series as relevant IEC
1 [* |& Z2 \) z/ T$ H& z% Y4 E8 c1 kcomponent standard for appliance inlets.
( _$ i% }$ R/ B/ L/ z* [/ |However, there aren't any specific temperature limits for appliance inlets specified in table 4A parts 1% E4 t9 K7 G0 B$ |" s
and 2.
1 X& u% {- K- `" CThis results in a non-uniform interpretation whether:1 t: ]2 \8 V4 ?$ r
(a) the temperature limit of external surfaces of equipment which can be touched (95 °C7 O5 \/ g/ @( j+ }0 v
for the plastic housing of the appliance inlet)4 |! J/ h% u2 Y( a) g
OR1 |8 u3 Y f% L6 _' T4 O' w% p
(b) the temperature limit of IEC 60320-1 (70 °C for the pins of the appliance inlet for cold
% q/ W a9 T% yconditions)' X/ y8 L0 ], a% U! y* D1 r k4 Y
shall be chosen for the assessment of the maximum temperature of the appliance inlet.
. ~5 ]" ~- Q _ J$ o h! OA clarification for following would be helpful:
, c+ O7 O8 n; |/ W: \(i) Is (only) the maximum temperature of the appliance inlet housing to be measured?2 L T6 B/ ^7 P7 v* `
OR3 R9 m6 Q, }% J1 H1 s, B4 S! Q5 i; f4 e
(ii) Is it necessary to measure besides the temperature of accessible surfaces as well1 a3 J6 n/ l* f1 f3 M! n' k
the maximum temperature of the pins of an appliance inlet (test location as required
$ g: _# x# |1 w$ Gaccording to IEC 60320-1)?
, p$ L4 @. x& f, D ~! nDecision:
0 n4 Q4 r4 j3 wFor testing of a product incorporating IEC 60320-1 type appliance inlets, the temperature limits and; X. S: Q. q6 Y
locations for temperature measurements as described in IEC 60320-1 shall apply: ^: f' Q* n8 F' B1 Y* n. k
• 70 °C maximum pin temperature for appliance inlet for cold conditions
% l' E7 b* R5 i3 b$ p- a2 @• Test location: Base of the pin (part of the pin where it protrudes from the engagement face)3 k0 `, G' @2 P1 h! a& Y' ^
The temperature rise shall be determined at the maximum room ambient temperature as declared by
9 _3 b5 ]9 i) z" T- k) m5 ~the AC Adaptor's manufacturer.
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