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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)： | 3/10頁 |
| 文件大?。?/td> | 118K |
| 代理商： | AN1354 |
APPLICATION NOTE
3/10
Fig. 3: Voltage across run triac after turn-off (612V max)
Refrigerator or freezer compressors mostly feature input power in the range of 100-300 W. The steady
state current is then in the range of 0.5 to 3 A RMS for a 220-240 V mains voltage.
The highest current appears at start-up and can reach up to 4 times the steady state current. Thermal cal-
culations can demonstratethat, as these events last a short time, 6 A devices can be used without any heat
sink. For example, Figure 4 gives the junction temperature increase of an ACST6-7ST without any heat
sink, due to the inrush current which is measured through the start winding of a 1/5 Horse power compres-
sor. It shows that Tj only reaches 72 °C, when coming from a 60 °C ambient temperature, and remains be-
low the maximum allowed temperature (125 °C).
2.2.2 Current rating
Fig. 4: Inrush current in START winding (1/5 Horse power compressor)
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