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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)： | 21/32頁 |
| 文件大?。?/td> | 227K |
| 代理商： | IR1110 |
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21
IR1110
ADVANCE INFORMATION
www.irf.com
Dedicated One Phase Operation
The IR1110 can be set for dedicated operation of a 1-phase half-controlled SCR bridge.
The UIN and VIN input terminals are used. No connection is made to WIN.
When Pin 12 is connected to V
SS
, the W timing wave and watchdog circuits are disabled,
the watchdog reset time is optimized for 1-phase operation, and 1-phase shutdown is disabled,
regardless of the connection of Pin 13.
Snubber Derived Power Supply
Snubbers will generally be required, either across the AC lines or directly across the
SCRs, to limit dv/dt when the line voltage is switched on.
If SCR snubbers are used, the snubber current can be used to derive the power supply
voltages for the IR1110 and SCR drivers.
With reference to Figure 10, positive snubber current flows via the three RC snubbers and
the D+ diodes, to create a nominal 15V supply across ZD1 and C1, for the SCR driver.
A nominal positive 5.1V V
DD
supply is developed across ZD2 and C2. Negative snubber
current flows via D- diodes, to create a nominal -5.1V V
SS
supply across ZD3 and C3.
The ZD1 and ZD4 protect the supply voltages against transients on the line voltages.
This power supply circuit requires that the average current consumed by the SCR driver
circuits does not exceed about 10mA.
Note that an auxiliary winding on a DC bus derived switching power supply would not by
itself serve the IR1110. This is because bus-derived power cannot deliver voltage until after
charging of the DC bus capacitor has already commenced, while the IR1110 must be powered
beforecharging of the bus capacitor commences.
It would be possible to use an auxiliary winding on a DC bus derived power supply to
supplement the snubber derived power. This could be preferred where the AC input line induc-
tance is high, therefore only minimal snubbers - insufficient to furnish the total power required by
the IR1110 and SCR drivers - are needed for dv/dt protection of the SCRs.
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