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參數(shù)資料
| 型號： | IRMDSS1 |
| 廠商： | International Rectifier |
| 英文描述： | IR1110 Soft Start IC Reference Design Kit For AC Motor Drives, UPS, Welders, and other applications |
| 中文描述： | IR1110軟啟動IC參考設計套件交流電機驅(qū)動器，不間斷電源，焊工，和其他應用程序 |
| 文件頁數(shù)： | 7/23頁 |
| 文件大小： | 121K |
| 代理商： | IRMDSS1 |
7
k is given approximately by the following relationship:
k VBUS1 =
(
R
R
R
80
+
79
80
VBUS1
)
- 0.1 VLLmax
= 0.75 VBUS1 - 0.1 VLLmax
Note that the value of k can be adjusted, if needed, by changing the value of
R79.
then when the input voltage returns, the dc bus voltage is
ramped back by SCR phase control.
(b) If the bus voltage dips below k VBUS1 during the line outage,
4(g)
Temporary loss of one input phase.
than 1 to 1 1/2 cycles, the SCR firing pulses are removed,
deactivating the rectifier. When the missing phase returns, the bus
voltage ramps back to the set value.
Without this one-phase shut-down function, the following
operating problems could occur:
If one input phase is lost during 3-phase operation, for more
(a) If one input phase is lost while the bus voltage is being
regulated to less than the maximum value, the rectifier output
voltage can transiently jump to the maximum value when the
missing phase returns.
This is undesirable, unless there is sufficient inductance
in the ac input lines, or in the dc smoothing inductor, (if used),
to limit the resulting current.
(b) Transient loss of one phase during the early part of initial
ramp-up can cause a jump of bus voltage to the maximum
value, if the missing phase returns while ramp-up is still in
progress.
For these reasons, the IR 1110 Reference Design is factory-set
with the one-phase shut-down function enabled.
4(h)
Disabling one-phase shut-down at maximum bus voltage, if the
voltage regulation function is not used.
desired to disable the one phase shut-down function in normal
If the bus voltage regulation function is not used, it may be
IRMDSS1
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