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參數(shù)資料
| 型號： | IR1110 |
| 廠商： | International Rectifier |
| 英文描述： | SOFT START CONTROLLER IC |
| 中文描述： | 軟起動控制器芯片 |
| 文件頁數(shù)： | 31/32頁 |
| 文件大?。?/td> | 227K |
| 代理商： | IR1110 |
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31
IR1110
ADVANCE INFORMATION
www.irf.com
result in excessive bus capacitor charging current.
For this reason it is recommended that the 1-Phase Shutdown circuit is enabled, (Pin 13
connected to VDD) in designs where the voltage control function of the IR1110 is used
For designs where the voltage control function is not used, operation at full bus voltage,
with 1 Phase Shutdown disabled, allows natural transitioning from 3-Phase to 1-Phase operation,
and vice versa, without excessive voltage jumps.
With 1-Phase Shutdown disabled, however, transient loss of one phase, during the early
part of ramp-up, could cause a jump of bus voltage and a high instantaneous bus capacitor
charging current, if the missing phase returns before ramp-up has finished, while the instanta-
neous bus voltage is still low.
The likelihood is remote of one phase being lost and then returning during the infrequently
occurring first 50 to 100ms window of the initial ramp-up period. Given the improbability of such an
event, provided the instantaneous charging current cannot exceed the surge capability of the
SCRs, no additional remedy may generally be necessary.
The circuit shown in Figure 13 can be used to protect against this unlikely event, if judged
necessary. The polarity of the Error Amplifier 1 average output signifies whether the instantaneous
bus voltage is above or below a fixed level, set by VBREF.
If one phase loss occurs during ramp-up, when the bus voltage is instantaneously below
the set level, the output of Error Amplifier 1 is negative, and Q2 is ON, 1-Phase Shutdown is
enabled. If one phase loss occurs at instantaneous bus voltage above the set level, Q2 is OFF
and the voltage on C
UVLO
is pulled high by R3, disabling 1-Phase Shutdown.
DC bus Short Circuit
With a short circuit across the DC bus, the line-to-line voltages collapse to zero at the
SCR firing instants, causing the timing waves to terminate prematurely.
If a short circuit is present at start up, 1-phase loss pulses start to be generated as the
ramp increases, and the firing angle advances by more than about 30
°
. See Figure 8. With 1-
Phase Shutdown enabled, these pulses set the UV lock comparator and clamp the ramp.
The overall result is that the short circuit current is automatically limited to a relatively low
pulsatingt level, as the ramp repeatedly tries to increase, then is rest each time the firing angle
attempts to advance by more than 30
°
.
If a short circuit occurs during normal operation, the bus dip comparator resets the ramp
to zero, limiting the short circuit current within less than half cycle. Thereafter, the short circuit
current is automatically limited to relatively low pulsating level, as described above.
The short circuit condition is signified by 1-phase loss pulses appearing and disappearing,
as the ramp increases then resets, accompanied by essentially zero bus voltage. The interval
between pulses depends upon C
RAMP
.
If 1-Phase Shutdown is disabled, and a short circuit exists at start up, the ramp increases,
advancing the SCR firing angle, until the line fuses blow, or other external action occurs. For
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