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MEPS Levels
6 ]& v2 u8 D/ A8 @Energy performance requirements include the average efficiency (measured at 25%, 50%, 75% and 100% of rated output power) and consumption at no load. To meet MEPS, a power supply must meet or exceed the requirements for average efficiency, and meet or be lower than the no load thresholds, when tested according to AS/NZS 4665.1.8 P: A: f0 A2 Z% _6 y1 o
MEPS requirements are shown in Table 1 and Table 2 below:% Q$ c9 K( g/ e1 h2 Q- h
Table 1: MEPS required minimum efficiency level
3 A' P: J! ]( t# nNameplate Power Output (Pno) Average Efficiency
* K9 c" N8 y0 h+ [# E" A6 @0 to 1 watt ≥ 0.49 x Pno
0 Z. u8 g8 p; a. v6 d> 1 to 49 watts ≥ 0.09Ln(Pno)+0.493 e( K$ l6 K/ Z1 F3 D n7 S; b( l
> 49 to 250 watts ≥ 0.84$ \) X/ u! w3 G! ^9 j
Where:2 t$ n. V! H( n4 I, A
Pno is the nameplate output power of the Unit Under Test." E0 b$ {$ V P; q9 a- |& l
"Ln" refers to the natural logarithm (base e). The algebraic order of operations requires that the natural logarithm calculation be performed first.. ~( f# O: A z
Table 2: MEPs required maximum no-load power (Watts)% @7 l8 o8 V; Q; \9 b) ?4 V8 [3 }
Nameplate Power Output (Pno) No Load Power
6 D' M5 z* [/ t9 dWatts AC-DC No Load Power
( Q+ D) n' e6 P3 B2 UWatts AC-AC8 x# z" _2 ]! T- }
0 to < 10 watts ≤ 0.5 N/A
9 K# f; m; N+ C* v6 J& N, ]10 to 250 watts ≤ 0.75 N/A
A( @5 g% h) WHigh Efficiency Levels9 v& n" s8 w6 f) {# @# x' ]
Minimum efficiency levels for "High Efficiency Power Supplies", are shown in Table 3 below.
2 I+ B0 g+ j. X5 Z. q2 ITable 3: Efficiency requirements for 'high efficiency' external power supplies# }, @4 P0 n- A$ o% Z4 N( a
Nameplate Power Output (Pno) Average Efficiency
5 I. U+ M+ R; p0 to 1 watt ≥ 0.5 x Pno
) S7 }% h5 y; u4 N$ J> 1 to 51 watts ≥ 0.09Ln(Pno)+0.5
8 Z( X5 P0 M; c3 V. W0 Y> 51 to 250 watts ≥ 0.85: H9 p& e4 I& m' O3 j8 M( a
Where:
3 {# S @# p4 Y: d6 l$ xPno is the nameplate output power of the Unit Under Test.$ h) b: t, l2 f
"Ln" refers to the natural logarithm (base e). The algebraic order of operations requires that the natural logarithm calculation be performed first.
% r# @" |8 r N. R; pTable 4: High Efficiency requirements for maximum no-load power (Watts)
2 H7 i% i" U8 t" ?Nameplate Power Output (Pno) No Load Power
Q1 J$ m- o+ G lWatts
3 N- M: j) E4 U3 u0 to ≤ 250 watts ≤ 0.5' ^/ z- u) w+ Z# D
Energy Performance Mark
L/ k4 a& V) T- j' q0 ?The energy performance mark is an international initiative to assist regulators monitor compliance with AS/NZS 4665-2005. It will be mandatory from October 2008. |
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