Vicor Micro Family of DC-DC Converter - Manual (Page 43)

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 42 of 88
Apps. Eng. 800 927.9474 800 735.6200
9. Modular AC Front-end System (ENMod)
Harmonic Current
0.01
0.10
1.00
10.00
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
Harmonic Number
C
u
rr
e
n
t
(A
)
Measured Values
Odd Harmonic Limits
Even Harmonic Limits *
Figure 9–2 — Measured harmonic current at 230 Vac, 575 W vs. EN spec limits (*Measured values of even harmonics are below 0.01 A)
Microcontroller
N
L
PTC
Thermistor
+OUT
–OUT
Strap
EN
BOK
Strap
SR
EMI
Filter
EMI GND
400
300
200
100
0
90–132 V
AC Line
Output
Bus
(Vdc)
Strap
PTC
Thermistor
Bypass
Converter
Enable
Bus OK
~150 ms
Power
Up
Power
Down
Timing Diagram, Power Up/Down Sequence
4.1
1.1
2.1
3.1
5.1
2.2
1.2
~150 ms
Figure 9–3 — Functional block diagram: FARM3 module Figure 9–4 — Timing diagram: Power-up / down sequence
Figure 9–5 — Start up at 120 Vac input Figure 9–6 — Start up at 240 Vac input
Vdc output
Strap
Engaged
Enable Enable
Bus OK
Vdc output
Bus OK
⇒