DSH 548 Application of IEC 60320-1 type appliance inlets

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DSH 548 ( Y3 q0 s) P3 i( K

Application of IEC 60320-1 type appliance inlets

1.5.2, 4.5.1 , u$ y; I( N2 n4 ?' E

60950(ed.3)

Standard(s):
IEC 60950:1999
$ u5 j+ R' b1 Y9 d- m; Y  Q5 Y: p3 |Sub clause(s):
1.5.2, 4.5.1
% J6 ~& @6 A& V( H9 fDec. NO.
# y- ^% i3 p- _# g( V( w' t' ]. VDSH-548
# ]$ t' z8 ^( r2 a) s% ]Subject:
9 H: c4 O2 g/ vApplication of IEC 60320-1 type
appliance inlets
Key words:
0 l& }: [3 F) A: w2 i6 W9 Z7 X---
Decision taken at the 41st
CTL meeting.
Question:
+ I2 S' V! C- J9 c  P$ XBackground:
- L" `' I, c5 `4 ^! ~  g) RAn increasing number of Notebook PCs require AC Adaptors to provide output power of up to 150 W
) ?, c3 ^( i! L3 I! W9 V, p, P+ `at an ambient of up to 40 °C (due Pentium-4 devices). Although designed with a very good efficiency,
* q7 r0 f) ~4 f3 p7 \1 s* Othe losses still result in high operating temperatures.
6 E% D/ y- q9 o0 c5 }; O( LProblem:
) Z* Q2 z& E  R+ I& x+ W+ gIEC 60950:99 refers in several subclauses and in Annex P to IEC 60320 series as relevant IEC
- d8 y0 k6 x6 N' ]1 Jcomponent standard for appliance inlets.
However, there aren't any specific temperature limits for appliance inlets specified in table 4A parts 1
and 2.
This 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)
& I% R, W& X1 U1 s2 b" [' p! \OR
8 Q: w3 [: M" N7 k8 h(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.
A clarification for following would be helpful:
$ Z" L1 S# s+ m0 Z(i) Is (only) the maximum temperature of the appliance inlet housing to be measured?
  @& F4 l0 Q! MOR
9 V2 B: L5 u6 s: b" r' N* V(ii) Is it necessary to measure besides the temperature of accessible surfaces as well
the maximum temperature of the pins of an appliance inlet (test location as required
according to IEC 60320-1)?
Decision:
- t/ Z9 J% `2 ]# {/ G% Z: v/ tFor testing of a product incorporating IEC 60320-1 type appliance inlets, the temperature limits and
: A! I: O& m7 F; j9 Z5 @locations for temperature measurements as described in IEC 60320-1 shall apply:
• 70 °C maximum pin temperature for appliance inlet for cold conditions
• Test location: Base of the pin (part of the pin where it protrudes from the engagement face)
2 ?1 G, t* s5 P0 rThe temperature rise shall be determined at the maximum room ambient temperature as declared by
  b$ o, X  ~. L; c3 E3 H3 Wthe AC Adaptor's manufacturer.
. r2 ]) }: n  x6 N+ b

3 q  c( d8 }" |7 `4 J

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