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參數(shù)資料
| 型號(hào)： | FAN1851AN |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | Ground Fault Interrupter |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDIP8 |
| 封裝： | LEAD FREE, PLASTIC, DIP-8 |
| 文件頁數(shù)： | 7/11頁 |
| 文件大?。?/td> | 122K |
| 代理商： | FAN1851AN |
PRODUCT SPECIFICATION
FAN1851A
REV. 2.0.1 6/17/05
7
where:
T = integration time
V = threshold voltage
I = average fault current into CT
(6)
therefore:
(7)
I
120 V
rms
R
B
)
------------------------------------
RN
+
RG
RN
-----------------------
=
heavy fault
current generated
(swamps I
TH
)
portion of fault
current shunted
around GFI
1000 turns
----1 turn
1
0.91
)
×
×
×
current
division of
input sense
transformer
CT
charging
on half-
cycles
only
rms to
average
conversion
CT
500
120
+
1.6
0.4
-------0.4
×
1000
---1
×
×
0.91
(
)
×
17.5
-----------------------------------------------------------------------------------------------------------------
0.008
×
=
CT
0.01 μF
=
In practice, the actual value of C
T
will have to be modified
to include the effects of the neutral loop upon the net charg-
ing current. The effect of neutral loop induced currents is dif-
ficult to quantify, but typically they sum with normal fault
currents, thus allowing a larger value of C
T
. For UL943
requirements, 0.015μF has been found to be the best com-
promise between timing and noise.
For those GFI standards not requiring grounded neutral
detection, a still larger value capacity can be used and better
noise immunity obtained. The larger capacitor can be accom-
modated because R
N
and R
G
are not present, allowing the
full fault current, I, to enter the GFI.
In Figure 10, grounded neutral detection is accomplished by
feeding the neutral coil with 120Hz energy continuously and
allowing some of the energy to couple into the sense trans-
former during conditions of neutral fault.
Transformers may be obtained from Magnetic Metals, Inc.,
(http://www.magmet.com).
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