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| 型号： | FARM2TS3 |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 750 W AC-DC UNREG PWR SUPPLY MODULE |
| 文件页数： | 10/11页 |
| 文件大小： | 633K |
| 代理商： | FARM2TS3 |
Vicor Corp. Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
FARM, Filter/Autoranging Rectifier Module
Rev. 6.0
Page 8 of 11
Set your site on VICOR at vicorpower.com
The power fail warning time (
Δt) 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 205 V
and 190 V, respectively. A simplified relationship between
power fail warning time, operating power, and bus
capacitance is obtained by inserting these constants:
C = 2P
Δt / (2052 – 1902)
C = 2P
Δt / (5,925)
It should be noted that the series combination (C1, C2, see
Fig. 9)
requires each capacitor to be twice the calculated
value, but the required voltage rating of each capacitor is
reduced to 200 V. 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 15 V and nominal
input is 300 V will provide approximately 56 dB ripple
rejection, i.e., 10 V p-p of input ripple will produce 15 mV
p-p of output ripple (see Fig. 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 Fig. 13) of the ripple, respectively. The
capacitors must hold-up the bus voltage for the time interval
(
Δt) between peaks of the rectified line as given by:
Δt = (π – θ) / 2πf(4)
Where:
f = line frequency
θ = rectifier conduction angle
The approximate conduction angle is given by:
θ = Cos-1(V
2/V1)
(5)
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:
I rms = 2P/Vac
(6)
Where:
P = total output power
Vac = operating line voltage
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.
APPLICATION NOTE (CONT.)
Example
In this example, the output required from the DC-DC converter
at the point of load is 12 Vdc at 320 W. Therefore, the output
power from the FARM would be 375 W (assuming a converter
efficiency of 85%). The desired hold-up time is 9 ms over an
input range of 90 to 264 Vac.
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 820 F. Since
two capacitors are used in series, each capacitor must be at
least 1,640 F. 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 90 Vac, ride-through
would be 68 ms. 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 12 V p-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 60 dB for a 12 V output. Since the
ripple on the bus voltage is 12 Vac and the ripple rejection of
the converter is 60 dB, the output ripple of the converter due
to ripple on its input (primarily 120 Hz) will be 12 mV p-p.
For more information about designing an autoranging
AC input power supply using the FARM and Vicor DC-DC
converter modules, contact Vicor Applications Engineering
at the nearest Vicor Technical Support Center, or send email
to apps@vicorpower.com.
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