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參數(shù)資料
| 型號： | AN1354 |
| 英文描述： | SINGLE-PHASE INDUCTION MOTOR DRIVE FOR REFRIGERATOR COMPRESSOR APPLICATION |
| 中文描述： | 單相異步電機驅(qū)動的冷柜壓縮機的應(yīng)用 |
| 文件頁數(shù)： | 5/10頁 |
| 文件大?。?/td> | 118K |
| 代理商： | AN1354 |
APPLICATION NOTE
5/10
2.8cm
Fig. 6: 5μH PCB inductor
3. STALLED ROTOR MANAGEMENT
In the case of a stalled rotor operation, the over current protection is commonly ensured by a thermal
cut-off. This component, also called “klixon”, is mandatory to prevent the compressor from over-heating.
Klixons are well adapted for motor protection, but not for semiconductors. Indeed, the turn-off time is in the
range of 15 s. The silicon switch will withstand a high current that will only decrease thanks to the motor
winding heating. In practice, the RMS current can fall from 9 A RMS to around 4.5 A RMS, for a 1/5 horse
power compressor.
The maximum junction temperature reached by the ACST6-7ST can then equal 160 °C as shown by the
simulation results in Figure 7.
As this temperature exceeds the maximum allowed steady state temperature of the triac (125 °C), reliabil-
ity tests have been performed to check the robustness of the silicon switches after such stress. ACST6 de-
vices can then withstand such currents up to more than 10 thousand times. This easily covers the number
of stalled rotor operations that can happen during the life cycle of a refrigerator or freezer.
3.1 Protection by thermal cut-off
Fig. 7: Triac junction temperature during stalled rotor operation
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