Vicor Micro Family of DC-DC Converter - Manual (Page 42)

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 41 of 88
Apps. Eng. 800 927.9474 800 735.6200
9. Modular AC Front-end System (ENMod)
The ENMod component power front-end system for
EN compliance provides an effective solution for an AC
front end of a power supply enabled with Vicor DC-DC
converters. The ENMod system’s basic building blocks are
the MiniHAM passive harmonic attenuation module, the
FARM3 autoranging AC-DC front-end module (Figure 9–3)
and a discrete EMI filter.
The ENMod system provides transient / surge immunity,
harmonic current attenuation (Figure 9–2) and EMI
filtering, in addition to all of the power switching and
control circuitry necessary for autoranging rectification,
inrush current limiting, and overvoltage protection.
Converter enable and status functions for orderly
power up / down control or sequencing are also
provided. To complete the AC front-end configuration,
the user only needs to add hold-up capacitors, EMI filter
(Figure 9–1b), and a few discrete components.
FARM3
N
SR
L
+
BOK
ST
EN
–
MINI
HAM
N/+
L/–
Filter
AC line Input
EMI GND
L
N +IN
PC
PR
–IN
+IN
PC
PR
–IN
Vicor 300 Vin
DC-DC
Converter
R1
R2
C1
C2
D2
D1
C3
C5
C4
C6
F1
F2
To additional converters
Part
C1,2
C3 – 6
C7,8
C9,C10
R1,2
R3, R4
V1,2
V3
V5,V6
F1,2
D1,2
D3,D4
Description
Holdup capacitors
4,700 pF (Y2 type)
Film Cap., 0.61 µF
0.001 µF
150 k Ω, 0.5 W
250 Ω, 0.125 W
MOV 220 V
270 V MOV
Bidirectional TVS Diode
Use recommended fusing for
specific converters
Diode (1N4006)
1N5817
Vicor
Part Number
01000
34610
30234-220
30076
1.5KE51CA
00670
26108
Sizing PCB traces:
All traces shown in bold carry significant
current and should be sized accordingly.
Holdup Box (HUB)
410 μF HUB820-S 1100 μF HUB2200-S
600 μF HUB1200-S 1350 μF HUB2700-S
900 μF HUB1800-S 1650 μF HUB3300-S
NC
NC
NC
NC
NC
N N
L L
PE
V1
V2 (Fig.1b)
C7
C8
Vicor 300 Vin
DC-DC
Converter
N/+
L/–
V3
D3
C9
C10
D4
V5
V6
R3
R4
PE
Figure 9–1a — Offline power supply configuration
C2
R4
C4
L2/N
L1
PE
L1
R3
L2
R1
R2
L3
C1
C3 F1
V1
N
L
PE
Input Output
Vicor
Part Description Part Number
C1 1.0 02573
C2, C3 4,700 pF (Y2 type) 01000
C4 0.33 µF 00927
F1 10 A Wickman 194 Series
or Bussman ABC-10
L1, L2 27 µH 32012
L3 1.3 mH 32006
R1, R2 10 Ω
R3 150 k Ω, 0.5 W
R4 2.2 Ω, 2 W
V1 MOV 30076
CM
Figure 9–1b — Input EMI filter for EN55022, Class B compliance
(Fig.9–1b)