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參數資料
| 型號： | FARM2TS1 |
| 廠商： | Vicor Corporation |
| 元件分類： | DC/DC變換器 |
| 英文描述： | FARM Filter/ Autoranging Rectifier Module |
| 中文描述： | 農場過濾器/自動調節整流模塊 |
| 文件頁數： | 8/12頁 |
| 文件大小： | 314K |
| 代理商： | FARM2TS1 |
Vicor Corp.
Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
FARM, Filter/Autoranging Rectifier Module
Rev. 4.7
Page 8 of 12
Set your site on VICOR at www.vicorpower.com
PRELIMINARY
*
Operating Power (W)
P
0
250
5
10
15
20
25
30
35
40
2200
μ
F
1600
μ
F
1300
μ
F
1000
750
500
1100
μ
F
820
μ
F
680
μ
F
*
*
(FARM2XXX)
(FARM1XXX)
Figure 14
—Hold-up time vs. operating power and total bus
capacitance, series combination of C1, C2 (see Fig. 9)
Operating Power (W)
P
0
250
5
10
15
20
25
30
2200
μ
F
1600
μ
F
1300
μ
F
1000
750
500
*
1100
μ
F
820
μ
F
680
μ
F
*
*
(FARM1XXX)
(FARM2XXX)
Figure 16
—Ripple voltage vs. operating power and bus
capacitance, series combination of C1, C2 (see Fig. 9)
Operating Power (W)
R
0
250
10
20
30
40
50
60
70
80
90
100
90Vac
115Vac
1000
750
500
Total
capacitance
820
μ
F
Figure 15
—Ride-through time vs. operating power
Figure 13
—Hold-up time
π
–
θ
θ
205V
185V
Power
Fail
Power Fail
Warning
B OK
Converter
Shutdown
Hold-up Time
254V
Ride-Thru Time
Ripple (V p-p)
The power fail warning time (
t) is defined as the interval
between B OK and converter shutdown (EN) as illustrated
in Fig. 13. 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
– 185
2
)
C = 2P
t / (7,800)
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 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 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. 17)
. Equation 3 is again used to determine the
required capacitance. In this case, V
1
and V
2
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 (
t) between
peaks of the rectified line as given by:
t = (
π
–
θ
) / 2
π
f
(5)
Where:
f = line frequency
θ
= rectifier conduction angle
The approximate conduction angle is given by:
θ
= Cos
-1
(
V
2
/V
1
)
(6)
Application Note (continued)
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相關代理商/技術參數 |
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