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MEPS Levels
; ]1 S* d3 X1 {# u( y9 dEnergy 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.
- g( L" [2 z( Z! {& aMEPS requirements are shown in Table 1 and Table 2 below:0 u, x6 b# L4 ] |
Table 1: MEPS required minimum efficiency level
5 \+ V, I$ R3 n- ~Nameplate Power Output (Pno) Average Efficiency7 l1 J( [# x- ^! q
0 to 1 watt ≥ 0.49 x Pno! c- C8 t6 [( M- d1 T
> 1 to 49 watts ≥ 0.09Ln(Pno)+0.49$ v2 A; x2 N7 Y" V! O. Z$ u, m1 k
> 49 to 250 watts ≥ 0.84
$ V& }0 P$ @, S% |: n" cWhere:
+ {5 @& f3 I# p; _5 Y+ a: ?Pno is the nameplate output power of the Unit Under Test.1 ], m# V$ g- R1 P
"Ln" refers to the natural logarithm (base e). The algebraic order of operations requires that the natural logarithm calculation be performed first.
0 K7 a- O/ C% M' ?5 F; f' dTable 2: MEPs required maximum no-load power (Watts)4 ?) f7 \" \% U6 o. U3 L
Nameplate Power Output (Pno) No Load Power* i! m, ]5 i1 R) S, P/ F
Watts AC-DC No Load Power
* {4 ]1 C# m: E9 |. B' O, e8 SWatts AC-AC
% z p1 e: S+ y! B+ B; u0 to < 10 watts ≤ 0.5 N/A
; r: X4 o$ o$ C" p) M4 Z3 J10 to 250 watts ≤ 0.75 N/A
4 A0 [1 f5 h. [1 Y# z0 X- `High Efficiency Levels
! L6 i. g. F$ KMinimum efficiency levels for "High Efficiency Power Supplies", are shown in Table 3 below.- B6 _. v0 @* [) p3 l
Table 3: Efficiency requirements for 'high efficiency' external power supplies
0 \, ]. A: |( @: v m& ]Nameplate Power Output (Pno) Average Efficiency
/ \/ p' [+ h4 W# B0 to 1 watt ≥ 0.5 x Pno% D6 X. L2 j# V% Z
> 1 to 51 watts ≥ 0.09Ln(Pno)+0.5
# _# ^- }6 K1 _% B( y> 51 to 250 watts ≥ 0.85
. c2 B3 w2 T* E$ z% t( S7 @5 KWhere:
3 a& G- V# m+ I, pPno is the nameplate output power of the Unit Under Test.$ }7 ^) s3 |3 C% }& j1 ?' i3 x
"Ln" refers to the natural logarithm (base e). The algebraic order of operations requires that the natural logarithm calculation be performed first.
4 [8 V' z4 ]4 o9 ?. H2 V! zTable 4: High Efficiency requirements for maximum no-load power (Watts)6 [* h0 ]7 M( \! o
Nameplate Power Output (Pno) No Load Power
/ P8 I" Q! P6 YWatts, N. T* \' L" S+ ~
0 to ≤ 250 watts ≤ 0.54 `: k i' S. W7 p
Energy Performance Mark
/ v# \$ u5 W& \' @" `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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