Instruction Manual

Design Guide & Applications Manual
F
or 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
345678910111213141516171819202122232425262728293031323334353637383940
Harmonic Number
Current (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
S
trap
SR
EMI
Filter
EMI GND
4
00
300
200
1
00
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
⇒