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MEPS Levels
+ f5 b7 v9 ~$ Y @& G8 {. MEnergy 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.+ |% H- e& d; F& W' {1 H; S: u
MEPS requirements are shown in Table 1 and Table 2 below:
$ X& w! C' _, |0 o( }+ LTable 1: MEPS required minimum efficiency level& U4 v( i! A% r2 L! p5 D4 X7 ]
Nameplate Power Output (Pno) Average Efficiency( c7 X4 N) l* `8 h0 c
0 to 1 watt ≥ 0.49 x Pno
) Z: |$ ?$ C7 g1 ?! U& H7 o; l> 1 to 49 watts ≥ 0.09Ln(Pno)+0.49: u9 ?) [( T [
> 49 to 250 watts ≥ 0.841 M* {* P' Y$ U" J
Where:
- @2 R2 c* k/ n0 {$ x+ D# e* c8 L* `Pno is the nameplate output power of the Unit Under Test.# j: }: _) o( U+ C& W
"Ln" refers to the natural logarithm (base e). The algebraic order of operations requires that the natural logarithm calculation be performed first.
: f' |- D6 |) D6 K c# \- mTable 2: MEPs required maximum no-load power (Watts). _7 j9 q* a* Y3 v2 W# h4 S
Nameplate Power Output (Pno) No Load Power
, E7 l2 f( E( ~; [( U" JWatts AC-DC No Load Power k+ S% C4 Z5 w# Q
Watts AC-AC
; V. Z$ t, x5 ?% p0 to < 10 watts ≤ 0.5 N/A
4 V' T! D% [7 W& c# g10 to 250 watts ≤ 0.75 N/A; c [3 h' ^5 W
High Efficiency Levels( t9 F$ F% y8 C* ]8 W Z
Minimum efficiency levels for "High Efficiency Power Supplies", are shown in Table 3 below., C3 }; @6 d& i4 X/ h
Table 3: Efficiency requirements for 'high efficiency' external power supplies$ U) }( M1 N7 G
Nameplate Power Output (Pno) Average Efficiency
6 P4 \% O% d0 q4 X0 to 1 watt ≥ 0.5 x Pno
# i/ n( g: v+ q- E3 A! F6 B3 t6 H> 1 to 51 watts ≥ 0.09Ln(Pno)+0.5
: o4 ?' U ^$ ^. n7 Z> 51 to 250 watts ≥ 0.85
/ u( b, w. s& F7 D" {" y8 X+ IWhere:$ w! M* Z6 J) u+ K% L8 Z) ?0 b
Pno is the nameplate output power of the Unit Under Test.
, ~1 _' V/ x& f6 ? l"Ln" refers to the natural logarithm (base e). The algebraic order of operations requires that the natural logarithm calculation be performed first.9 e3 b/ j+ I+ L$ K. E @/ E
Table 4: High Efficiency requirements for maximum no-load power (Watts)$ u3 c) N) ] T; g) ]
Nameplate Power Output (Pno) No Load Power
* f6 |# V6 \: lWatts
9 ^7 g: s- A1 z, t: Y0 to ≤ 250 watts ≤ 0.5
! k# y8 I; P/ JEnergy Performance Mark
* m7 R5 n/ [( y, g; H4 |7 L+ p% A, RThe 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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