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| 型號(hào)： | VI-ARM-M22 |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 1000 W AC-DC REG PWR SUPPLY MODULE |
| 文件頁(yè)數(shù)： | 11/11頁(yè) |
| 文件大?。?/td> | 637K |
| 代理商： | VI-ARM-M22 |
Vicor Corp. Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
ARM, Autoranging Rectifier Module
Rev. 3.6
Page 9 of 11
Set your site on VICOR at www.vicorpower.com
Operating Power (W)
P-P
Ripple
V
olta
g
e
(V
ac)
0
5
10
15
20
25
30
1500
1250
1000
750
500
250
*
2,200
μF
1,600
μF
1,300
μF
*
1,100
μF
820
μF
680
μF (VI-ARM-x1)
(VI-ARMB-x2)
Figure 17 — Ripple voltage vs. operating power and bus
capacitance, series combination of C1, C2 (see Fig. 10)
APPLICATION NOTE (CONT.)
Output Voltage
Ripple
Rejection
(dB)
40
45
50
55
60
65
70
75
80
50
30
15
5
2
Figure 18 — Converter ripple rejection vs. output voltage
Example
In this example, the output required at the point of load is 12
Vdc at 320 W. Therefore, the output power from the ARM
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.
Fig. 15 is used to determine hold-up 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:
The 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 16 illustrates ride-
through time as a function of line voltage and output power,
and shows that at a nominal line of 115 Vac, ride-through
would be 68 ms. Ride-through time is a function of line
voltage.
Determining Ripple Voltage on the Hold-up Capacitors.
Fig. 17 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 Vac.
Determining the Ripple on the Output of the
DC-DC Converter.
Fig. 18 is used to determine the ripple
rejection of the DC-DC converter and indicates a ripple
rejection of approximately 60 dB for a 12 Volt output. If 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.
Note that Maxi, Mini, Micro converters have greater ripple
rejection then either VI-200s or VI-J00s.
For more information about designing an autoranging AC
input power supply using the ARM and Vicor DC-DC
converter modules, contact Vicor Applications Engineering at
the nearest Vicor Technical Support Center (see back cover),
or send an E-mail to apps@vicorpower.com.
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 = operating power level
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 15, 16, and
17, respectively.
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| VI-ARM-M2N | 制造商:VICOR 制造商全稱:Vicor Corporation 功能描述:Autoranging Rectifier Modules Up to 1500 Watts |
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