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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/ ^7 E3 c6 c+ A9 W
我从IEC61558-1:1998 和IEC61558-1:2005 两个版本, 分别找到如下的描述:% v$ Q& u6 Q- u% [, L
1. 出自IEC61558-1:1998 clause 14.2$ L: m7 q7 o/ g# x
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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S; a% n( z6 }. l# v# d5 b, b2. 出自IEC61558-1:2005 clause 14.16 A Q {# F- V. X, p
Transformers are supplied at the rated supply voltage and loaded with an impedance# r, P3 J0 w3 r: W
producing the rated output, at the rated output voltage and, for a.c. current, at the rated' C' U' n' Z% ^$ Z1 V$ ^: k, o
power factor. The value of the output current is measured when steady state is established.& u0 B8 E4 _: y$ U: v( A
Then the supply voltage is increased by 10 % and the output current is adjusted to the same
/ O4 P" H N( h! z. |) x+ b# z: _value measured before. The output current is not adjusted for independent transformer. After
) O+ D5 m* U5 q$ F" Z; \ a- Fthis no change is made in the circuit. The test is repeated under no-load condition if this is a
: B$ j0 X) o/ `$ ?3 Z5 M6 L7 Wmore unfavourable situation.1 P m7 V( K- _% P) m7 O. T6 v
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从1998版标准, 明显可以看出"方法2"是对的.
% S5 C( ?6 E1 U' k3 W$ m从2005版标准, 针对independent transformer而言, 也应采用方法2+ n9 ]1 D8 O5 S6 R
且看independent transformer的解释:( C7 ]9 n( K6 l' a
3.1.77 U2 x5 Q5 H7 h7 k# F
independent transformer; ?8 _, H! X# ^
transformer designed to supply unspecified appliances and intended to be used without any1 H; o/ ^; |- }7 x* S
additional enclosure which provides protection against electric shock
6 s, M y' z E' p+ I( bNOTE􀀂 Such a transformer can be either a portable transformer or a stationary transformer
* p: k& A+ b* ]; ^ |可见外置电源产品属于independent transformer, 应该采用方法2了.
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8 S" q3 K8 g( s0 n6 @% q& V$ y% [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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