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FARM1C52 Datasheet(PDF) 8 Page - Vicor Corporation

Part # FARM1C52
Description  Filter/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

FARM1C52 Datasheet(HTML) 8 Page - Vicor Corporation

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FARM™
Rev 6.9
vicorpower.com
Page 8 of 11
06/2017
800 927.9474
FARMxxxx
Application Note (Cont.)
The power fail warning time (∆t) is defined as the interval
between B OK and converter shut down (EN) as illustrated
in Fig. 13. The Bus-OK and Enable thresholds are 205V and
190V, respectively. A simplified relationship between power
fail warning time, operating power, and bus capacitance is
obtained by inserting these constants:
It should be noted that the series combination (C1, C2, See
Figure 9) requires each capacitor to be twice the calculated
value, but the required voltage rating of each capacitor is
reduced to 200V. Allowable ripple voltage on the bus (or
ripple current in the capacitors) may define the capacitance
requirement. Consideration should be given to converter ripple
rejection and resulting output ripple voltage.
For example, a converter whose output is 15V and nominal
input is 300V will provide approximately 56dB ripple rejection,
i.e., 10Vp-p of input ripple will produce 15mVp-p of output
ripple (See Figure 17). Equation 3 is again used to determine
the required capacitance. In this case, V1 and V2 are the
instantaneous values of bus voltage at the peaks and valleys
(See Figure 13) of the ripple, respectively. The capacitors must
hold-up the bus voltage for the time interval (∆t) between
peaks of the rectified line as given by:
The approximate conduction angle is given by:
Another consideration in hold-up capacitor selection is their
ripple current rating. The capacitors’ rating must be higher
than the maximum operating ripple current. The approximate
operating ripple current (rms) is given by:
Calculated values of bus capacitance for various hold-up time,
ride-through time, and ripple voltage requirements are given
as a function of operating power level in Figures 14, 15, and
16, respectively.
Example
In this example, the output required from the DC-DC converter
at the point of load is 12VDC at 320W. Therefore, the output
power from the FARM would be 375W (assuming a converter
efficiency of 85%). The desired hold-up time is 9ms over an
input range of 90 to 264VAC.
Determining Required Capacitance for Power Fail
Warning: Figure 14 is used to determine capacitance for a
given power fail warning time and power level, and shows
that the total bus capacitance must be at least 820µF. Since
two capacitors are used in series, each capacitor must be at
least 1,640µF. Note that warning time is not dependent on line
voltage. A hold-up capacitor calculator is available on the Vicor
website, at: vicorpower.com/hubcalc.
Determining Ride-through Time: Figure 15 illustrates ride-
through time as a function of line voltage and output power,
and shows that at a nominal line of 90VAC, ride-through would
be 68ms. Ride-through time is a function of line voltage.
Determining Ripple Voltage on the Hold-up Capacitors:
Figure 16 is used to determine ripple voltage as a function of
operating power and bus capacitance, and shows that the
ripple voltage across the hold-up capacitors will be 12Vp-p.
Determining the Ripple on the Output of the DC-DC
Converter:. Figure 17 is used to determine the approximate
ripple rejection of the DC-DC converter and indicates a ripple
rejection of approximately 60dB for a 12V output. Since the
ripple on the bus voltage is 12VAC and the ripple rejection of
the converter is 60dB, the output ripple of the converter due to
ripple on its input (primarily 120Hz) will be 12mVp-p.
For more information about designing an autoranging
AC input power supply using the FARM and Vicor DC-DC convert-
er modules, contact Vicor Applications Engineering at the nearest
Vicor Technical Support Center, or send email to:
apps@vicorpower.com.
Storage
Vicor products, when not installed in customer units, should
be stored in ESD safe packaging in accordance with ANSI/
ESD S20.20, “Protection of Electrical and Electronic Parts,
Assemblies and Equipment” and should be maintained in
a temperature controlled factory/ warehouse environment
not exposed to outside elements controlled between the
temperature ranges of 15°C and 38°C. Humidity shall not be
condensing, no minimum humidity when stored in an ESD
compliant package.
C = 2Pt / (2052 – 1902)
C = 2Pt / (5,925)
(4)
t = (π – θ) / 2πf
Where:
f = line frequency
θ = rectifier conduction angle
(5)
θ = Cos-1V
2 /V1
(6)
I
RMS = 2P/VAC
Where:
P = operating power level
V
AC = operating line voltage


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