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|  DSH 548
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0 i y/ K, u6 c/ D' A6 y3 D | Application of IEC 60320-1 type appliance inlets
/ @- F, x7 S# ?# l | 1.5.2, 4.5.1+ b1 T! K$ K- `2 `
| 60950(ed.3)/ Y! m; A8 c' e+ w& u* Z
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Standard(s):; ]7 F1 }9 q) Q, l: L# g/ |
IEC 60950:19992 j- V: K. R7 n v
Sub clause(s):
$ L, C; n' h! k c4 x. k1.5.2, 4.5.1! V' e8 T3 h* z$ L& b4 I+ e8 ]/ ]6 @
Dec. NO.$ V( _2 e2 a3 ~ L
DSH-548
2 d6 d- h1 M: B+ ^ ?Subject:
m+ g) S' x0 @4 d/ u6 R5 g0 CApplication of IEC 60320-1 type; A8 ^. u6 P& X( n
appliance inlets7 ~+ r$ q3 \6 a d% ?- g5 L X7 r
Key words:
/ d$ |4 z1 ^( U---
/ [- C' D: Y) S$ ]/ R, zDecision taken at the 41st/ u, d' l7 x; |
CTL meeting.. w$ z% f3 O' K: Z. _
Question:8 h: | n! {4 C7 [
Background:% w4 A6 B/ y, ? H4 p. b2 g
An increasing number of Notebook PCs require AC Adaptors to provide output power of up to 150 W
* g& K& K3 g# pat an ambient of up to 40 °C (due Pentium-4 devices). Although designed with a very good efficiency,9 T4 [" k$ v- t1 n) }
the losses still result in high operating temperatures.1 |% @; @8 W6 X1 f
Problem:
+ J; F/ w4 C/ W5 V) V! ^IEC 60950:99 refers in several subclauses and in Annex P to IEC 60320 series as relevant IEC
" g c" X2 @3 Q' b! q$ z; [9 x& [component standard for appliance inlets.
" x: s Y b/ S( h3 n1 pHowever, there aren't any specific temperature limits for appliance inlets specified in table 4A parts 1. X; o! R; N8 D5 u9 W: X1 M: b& F: d
and 2.' K0 q+ D$ a9 j/ d" ` g& V
This results in a non-uniform interpretation whether:/ x9 x3 N9 J* `7 @% p& o) z7 ~
(a) the temperature limit of external surfaces of equipment which can be touched (95 °C0 b- e [! W) b
for the plastic housing of the appliance inlet)
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(b) the temperature limit of IEC 60320-1 (70 °C for the pins of the appliance inlet for cold1 ]) H+ }; {& I3 N6 E9 Y
conditions)
* M5 m- l2 t. C( v% K' O# Y9 k* x& Tshall be chosen for the assessment of the maximum temperature of the appliance inlet.
% h& h9 o2 w* z" ?# _A clarification for following would be helpful:) D* R2 v4 h% q$ v4 ]
(i) Is (only) the maximum temperature of the appliance inlet housing to be measured?
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3 D- `3 P! j% e1 B. T' A$ ~9 ?(ii) Is it necessary to measure besides the temperature of accessible surfaces as well
, G4 C1 s) F7 Z3 }9 a* qthe maximum temperature of the pins of an appliance inlet (test location as required
7 g. f# \5 F) Maccording to IEC 60320-1)?8 b4 c: ~- g m6 w7 |3 \
Decision:
& \7 r; H( b5 O" ~+ cFor testing of a product incorporating IEC 60320-1 type appliance inlets, the temperature limits and7 V, s& i- Y7 V7 U
locations for temperature measurements as described in IEC 60320-1 shall apply:
2 _) J8 X# l/ |) [$ M) A• 70 °C maximum pin temperature for appliance inlet for cold conditions" u8 M; D- n9 c% a! ]* L
• Test location: Base of the pin (part of the pin where it protrudes from the engagement face)8 v3 Y2 j( w! t9 F7 O6 X, \
The temperature rise shall be determined at the maximum room ambient temperature as declared by
) j$ s0 @4 a, Uthe AC Adaptor's manufacturer.5 R5 Z- A$ i) R' s
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