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參數(shù)資料
| 型號(hào)： | HUGD-50 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Hold-Up Solution 16-40V & 9-36V DC/DC Converter Compatible Metallic Case |
| 中文描述： | 套牢溶液16 - 40V的 |
| 文件頁(yè)數(shù)： | 7/13頁(yè) |
| 文件大?。?/td> | 374K |
| 代理商： | HUGD-50 |
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For locations, phone, fax, E-Mail see back cover
7
Hi-Rel
Grade
HUGD-50 Series
Gaia Converter FC97-027.01/06 Revision H
4
10- Application Notes
10-1 General on Input Bus Shut-
Down Requirements
During bus power drop-out, avionics and military
systems require a maintain of operation for saving
data and controlling the shut-down.
10-1-1 Capacitor Stand-Alone Solution
To maintain operation during this power drop-out, the
traditional approach is the use of a bulk capacitor
connected at the input of the converters to power
them when power drops-out. The capacitor needed
depends on the system specifications, the load and
the efficiency of the DC/DC converters and the amount
of capacitor for a given hold-up time. The value of the
capacitance is determined by the following formula :
where :
C :
P :
(in watts)
h :
is the efficiency of the converter at rated load
Dt :
is the required hold up time (in seconds)
V1 :
is the initial charged capacitor voltage (in volts)
V2 :
is the low line voltage of DC/DC converter
is the required capacitor (in farads)
is the power at the load (output of converter)
For a typical hold-up time of 50 ms with 50W power
(at the input of the DC/DC converter with 80%
efficiency) plugged on a MIL-STD-704D 28V bus that
can range down to 22V and considering the minimum
permanent input voltage of GAIA Converter module at
16V, the required capacitance is a huge with value of
18.000 μF/40V rated.
The duration of this shut-down operation is defined in
different standards and can last up to 7 secondes.
10-1-2 Capacitor with Hold Up Module Solution
To reduce drastically the size of this capacitor, GAIA Converter
proposes the hold up module HUGD-50 that will charge the
capacitor at a much higher voltage (typically 38V).
Moroever this module allows a selection of the minimum
threshold voltage at which the capacitance will begin to
power the converters. In this case the amount of capacitance
needed for a given hold up time is determined by the following
formula :
where :
C :
P :
h :
Dt :
V2 :
is the required capacitor (in farads)
is the power to the load (output of converter) (in watts)
is the efficiency of the converter at rated load
is the required hold up time (in seconds)
is the low line voltage of DC/DC converter (in volts).
For a typical hold-up time of 50 ms with 50W power (at the
input of the DC/DC converter with 80% efficiency) plugged
on a MIL-STD-704D 28V bus and using the hold up module
the capacitance required will decrease down to value of
5.000 μF/40V rated.
2 x P x (Dt + 0.01)
{ h x ( 38
2
- V2
2
)}
C2 =
( 2 x P x Dt )
{ h x ( V1
2
- V2
2
)}
C1 =
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