Vicor Micro Family of DC-DC Converter - Manual (Page 48)

Design Guide & Applications Manual
For Maxi, Mini, Micro Family DC-DC Converters and Configurable Power Supplies
Maxi, Mini, Micro Design Guide Rev 4.9 vicorpower.com
Page 47 of 88
Apps. Eng. 800 927.9474 800 735.6200
9. Modular AC Front-end System (ENMod)
205 V
190 V
Power Fail
Power Fail
Warning
Bus OK Converter
Shut down
Hold-up Time
254 V
Ride-Through Time
Ripple (V p-p)
π – θ θ
Operating Power (W)
0
5
10
15
20
25
30
35
40
500 250
*
P
o
w
e
r
F
a
il
W
a
rn
in
g
T
im
e
(
m
s
)
2,200 µF 1,600 µF 1,300 µF
*
1,100 µF 820 µF 680 µF
Figure 9–13 — General timing diagram of bus voltage following interruption of the AC mains
Figure 9–14 — Power fail warning time vs. operating power and
total bus capacitance, series combination of C1, C1 (Figure 9–1a)
Operating Power (W)
R
id
e
-t
h
ro
u
g
h
T
im
e
(
m
s
)
0
10
20
30
40
50
60
70
80
90
100
90 Vac 115 Vac
500 250
Figure 9–15 — Ride-through time vs. operating power
Operating Power (W)
P
-P
R
ip
p
le
V
o
lt
a
g
e
(
V
a
c
)
0
5
10
15
20
25
30
500 250
*
2,200 µF 1,600 µF 1,300 µF
*
1,100 µF 820 µF 680 µF
Output Voltage
R
ip
p
le
R
e
je
c
ti
o
n
(
d
B
)
40
45
50
55
60
65
70
75
80
50 30 15 5 2
Figure 9–16 — Ripple voltage vs. operating power and bus capaci-
tance, series combination of C1, C1 (Figure 9–1a) Figure 9–17 — Converter ripple rejection vs. output voltage (Typical)