IEEE Power Electronics Magazine - March 2017 - 21
al Schottky diodes. Additionally, optocouplers and associefficiency requirement at 10% load in the current CoC
ated feedback control components used on the secondversion 5 specification. Other EPS programs are considary side are being removed, as designers use primary side
ering including this in their future requirements. To
regulation schemes or new secondary side regulation
maintain constant efficiency over the entire load range,
approaches, replacing optocouplers by using the isolated
new designs vary switching waveforms depending on the
inductance of IC lead frames [6].
load, changing frequency, pulse
These efficiency improvements
width, and burst energy. In recent
come
at essentially the same mateyears, power conversion integrated
Synchronous rectificarial cost as the previous less-efficient
circuit (IC) manufacturers have
tion, once reserved
models, thanks to innovations from
introduced multiple new products
for more expensive,
component and power supply manuto address this challenge [5].
facturers. Tables 1-3 and Figures 2-4
■■Updated efficiency requirements.
high-performance
illustrate the three major EPS effiThe more stringent active efficiency
power supplies, is now
ciency programs/standards in force
requirements have also impacted the
today. It is important to note that the
output side of supplies. Synchronous
replacing traditional
requirements shown (and related test
rectification, once reserved for more
Schottky diodes.
procedures) have also been adopted
expensive, high-performance power
by other countries as well. Levels in
supplies, is now replacing tradition-
Table 1. The ac-dc single-output EPS active mode efficiency requirements.
Ec coc v5 (tier 2)
U.s. DoE (level VI)
standard (Basic) Voltage
Ec Ecodesign
(level V)
coc, 10% Efficiency
a
Name Plate Output
Power (P no )
Four-Point Average
Efficiency (minimum)
Four-Point Average
Efficiency (minimum)
Four-Point Average
Efficiencyb (minimum)
10% Point
Efficiency (minimum)
0 < Pno # 1W
$ 0.500 # Pno + 0.169
$ 0.500 # Pno + 0.16
0.480 # (Pno) + 0.140
$ 0.500 # (Pno) + 0.060
1 1 P no # 49 W
$ 0.071 # In (P no)
- 0.00115 # P no + 0.670
$ 0.071 # In (P no)
- 0.0014 # P no + 0.67
$ 0.063 # In (P no) + 0.622
$ 0.071 # In (P no)
- 0.00115 # P no + 0.570
49 1 P no # 250 W
$ 0.890
$ 0.88
0.87
$ 0.790
2 250 W
N/A
$ 0.875
N/A
N/A
a
low Voltage
Name Plate Output
Power (P no )
Four-Point Average
Efficiency (minimum)
Four-Point Average
Efficiency (minimum)
Four-Point Average
Efficiencyb (minimum)
10% Point
Efficiency (minimum)
0 < Pno # 1W
$ 0.517 # P no + 0.091
$ 0.517 # P no + 0.087
0.497 # P no + 0.067
$ 0.517 # P no
1 1 P no # 49 W
$ 0.0834 # In (Pno)
- 0.0011 # P no + 0.609
$ 0.0834 # In (P no)
- 0.0014 # P no + 0.609
0.075 # In (P no) + 0.561
$ 0.0834 # In (P no)
- 0.00127 # P no + 0.518
49 1 P no # 250 W
$ 0.880
$ 0.870
0.860
$ 0.780
2 250 W
N/A
$ 0.875
N/A
N/A
N/A: not available.
a
Standard voltage power supply excludes low-voltage power supplies defined as having a name plate output of < 6 V and ≥ 550 mA.
b
Ecodesign power levels are ≤ 51 W and > 51 W (not 49 W).
Table 2. The ac-dc single-output EPS no-load power consumption requirements.
Ec coc, Version 5 (tier 2)
U.s. DoE (level VI)
Ec Ecodesign (level V)
Name Plate Output Power (P no )
No-Load Power Maximum (W)
No-Load Power Maximum (W)
No-Load Power Maximum (W)
0 1 P no # 49 W
0.075
0.100
0.300
49 1 P no # 250 W
0.150
0.210
0.500
2 250 W
N/A
0.500
N/A
March 2017
z IEEE PowEr ElEctronIcs MagazInE
21
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