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參數(shù)資料
| 型號： | VI-ARM-C11 |
| 廠商： | Vicor Corporation |
| 元件分類： | DC/DC變換器 |
| 英文描述： | Autoranging Rectifier Modules Up to 1500 Watts |
| 中文描述： | 自動(dòng)調(diào)節(jié)整流模塊功率高達(dá)1500 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大?。?/td> | 302K |
| 代理商： | VI-ARM-C11 |
Vicor Corp. Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
ARM, Autoranging Rectifier Module
Rev. 2.4
Set your site on VICOR at www.vicorpower.com
Application Note, continued
*
Operating Power (W)
AC
Fail
Warning
Time
(ms)
0
5
10
15
20
25
30
35
40
2200F
1600F
1300F
1500
1250
1000
750
500
250
1100F
820F
680F
*
(Arm-2)
(Arm-1)
Figure 13—Hold-up time vs. operating power and total bus
capacitance, series combination of C1, C2 (Fig. 8)
Operating Power (W)
P-P
Ripple
Volts
(V)
0
5
10
15
20
25
30
2200F
1600F
1300F
1500
1250
1000
750
500
250
*
1100F
820F
680F
*
(Ver. 12)
(Ver. 22)
Figure 15—Ripple voltage vs. operating power and bus
capacitance, series combination of C1, C2 (see Fig. 8)
Operating Power (W)
Hold
up
Time
(ms)
0
10
20
30
40
50
60
70
80
90
100
90Vac
115Vac
1500
1250
1000
750
500
250
Total
capacitance
820F
Figure 14—Ride-through time vs. operating power
Figure 12—Hold-up time
π – θθ
205V
185V
Power
Fail
Power Fail
Warning
B OK
Converter
Shutdown
Hold-up Time
254V
Ride-Thru Time
Ripple (V p-p)
The holdup time (
t) is defined as the interval between power
fail warning (B OK) and converter shutdown (EN) as illustrated
in Fig. 12. The Bus-OK and Enable thresholds are 205V and
185V, respectively. A simplified relationship between hold-up
time, operating power, and bus capacitance is obtained by
inserting these constants:
C = 2P
t / (205
2 – 1852)
C = 2P
t / (7,800)
It should be noted that the series combination (C1, C2, Fig. 8)
requires each capacitor to be twice the calculated value,
but the required voltage rating 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. The ripple rejection (R) of many
Vicor converters is specified as a function of the input/output
voltage ratio:
R = 30 + 20log(Vin / Vout)
(4)
For example, a converter whose output is 15V and nominal
input is 300V will provide 56dB ripple rejection, i.e., 10V p-p
of input ripple will produce 15mV p-p of output ripple. (See
Fig. 16) 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. 12) 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:
t = (π – θ) / 2πf
(5)
Where:
f = line frequency
θ = rectifier conduction angle
The approximate conduction angle is given by:
θ = Cos
-1V
2/V1
(6)
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