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发表于 2007-6-15 11:11
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我们电源产品输出标识: 额定输出电压, 额定输出电流
: D' A# R q* H* G8 b6 Z0 j2 \" Q我从IEC61558-1:1998 和IEC61558-1:2005 两个版本, 分别找到如下的描述:9 k# [$ A+ L4 P, ~
1. 出自IEC61558-1:1998 clause 14.2: Q8 i" E1 u$ y
Transformers are connected to rated supply voltage and loaded with an impedance which would give rated output, at rated output voltage and, for a.c. current, at rated power factor; then the supply voltage is increased by 6%. After this voltage increase, no change is made in the circuit, the test is repeated under no-load condition if this a more unfavourable situation
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2. 出自IEC61558-1:2005 clause 14.1
0 k$ l6 S/ @- N7 } LTransformers are supplied at the rated supply voltage and loaded with an impedance
5 B' K, r) d7 p3 Q, R, fproducing the rated output, at the rated output voltage and, for a.c. current, at the rated
0 o# x+ ~0 Q# W4 j: apower factor. The value of the output current is measured when steady state is established.: [! H' D* P/ |; D( C
Then the supply voltage is increased by 10 % and the output current is adjusted to the same
' P! ]1 r f& ]7 J8 v, d0 bvalue measured before. The output current is not adjusted for independent transformer. After
% T+ O: N, z6 _# e% W8 ~this no change is made in the circuit. The test is repeated under no-load condition if this is a
' C2 @9 S, O9 {0 Hmore unfavourable situation.' J s' c. ]$ H
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从1998版标准, 明显可以看出"方法2"是对的.! v. G6 d: s' P$ s) o+ j
从2005版标准, 针对independent transformer而言, 也应采用方法24 [4 R9 Y8 D, `1 U0 _5 A( _
且看independent transformer的解释:
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independent transformer
8 j, ? V- D i% L6 g6 d8 o7 }transformer designed to supply unspecified appliances and intended to be used without any) I6 q% ~# G. O- b: k/ R
additional enclosure which provides protection against electric shock9 W3 A+ r* }' [9 d5 }4 j, W1 l
NOTE􀀂 Such a transformer can be either a portable transformer or a stationary transformer
5 _) |( d3 x$ d8 V# g可见外置电源产品属于independent transformer, 应该采用方法2了.
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& J' ]+ W7 E5 g6 v$ W1 f3 J) b原来, 受到61558标准的影响, 所以对方法2影响深刻. 其他标准, 我不知道有没有类似的说明. |
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