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FARM1HK2 Datasheet(PDF) 7 Page - Vicor Corporation

Part # FARM1HK2
Description  Autoranging Rectifier Module Up to 1000 Watts
Download  11 Pages
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Manufacturer  VICOR [Vicor Corporation]
Direct Link  http://www.vicorpower.com
Logo VICOR - Vicor Corporation

FARM1HK2 Datasheet(HTML) 7 Page - Vicor Corporation

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FARM
Rev 6.7
vicorpower.com
Page 7 of 11
06/2015
800 927.9474
FARMxxxx
+IN
PC (GATE IN)
PR
–IN
N
EMI GND
N/C
L
+
EN
150 k
15 Vdc
Micro-
controller
Vicor DC-DC
Converter
FARM
BOK
ST
Not used with VI-260/VI-J60
Figure 10 — Enable (EN) function
Bus-OK (BOK) Pin. (see Fig. 11)
The Bus-OK pin is
intended to provide early-warning power fail information and
is also referenced to the negative output pin.
CAUTION: There is no input-to-output isolation in
the FARM. It is necessary to monitor Bus OK via an
optoisolator if it is to be used on the secondary
(output) side of the converters. A line-isolation
transformer should be used when performing
scope measurements. Scope probes should never
be applied simultaneously to the input and output
as this will damage the module.
Filter. (see Fig. 12)
An integral input filter consists of a
common mode choke and Y rated capacitors (line-ground)
plus two X rated capacitors (line-line). This filter
configuration provides common mode and differential mode
insertion loss in the frequency range between 100 kHz and
30 MHz as illustrated in Figure 6.
Hold-up Capacitors.
Hold-up capacitor values should be
determined according to output bus voltage ripple, power fail
hold-up time, and ride-through time (see Fig. 13).
Many applications require the power supply to maintain
output regulation during a momentary power failure of
specified duration, i.e., the converters must hold-up or ride-
through such an event while maintaining undisturbed output
voltage regulation. Similarly, many of these same systems
require notification of an impending power failure in order to
allow time to perform an orderly shut down.
The energy stored on a capacitor which has been charged to
voltage V is:
ε = 1/2(CV2)(1)
Where:
ε = stored energy
C = capacitance
V = voltage across the capacitor
Energy is given up by the capacitors as they are discharged by
the converters. The energy expended
(the power-time product) is:
ε = PΔt = C(V
1
2–V
2
2) / 2
(2)
Where:
P = operating power
Δt = discharge interval
V1 = capacitor voltage at the beginning
of
Δt
V2 = capacitor voltage at the end of Δt
Rearranging Equation 2 to solve for the required capacitance:
C = 2P
Δt / (V1
2–V
2
2)(3)
APPLICATION NOTE (CONT.)
+IN
PC
PR
–IN
N
EMI GND
N/C
L
+
BOK
ST
EN
Vicor DC-DC
Converter
Micro-
controller
15 Vdc
+5 Vdc
Secondary
referenced
Figure 11 — Bus OK (BOK) isolated power status indicator
4.7 nF
L1
4.7 nF
N
EMI GND
N/C
L
0.47 μF
0.099 μF
330 μH
+
BOK
ST
EN
CM
Figure 12 — Internal filter


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