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參數(shù)資料
| 型號： | AN6562) |
| 英文描述： | Voltage-Feedback Operational Amplifier |
| 中文描述： | 電壓反饋運(yùn)算放大器 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大小： | 118K |
| 代理商： | AN6562) |
APPLICATION NOTE
6/10
In order to secure the life expectancy of a refrigerator, the stalled rotor protection can also be achieved by
the electronic board. In this case, the over-current is applied to the motor and the switches for less than 1 s,
as opposed to 15 s with a thermal cut-off. The maximum junction temperature will then reach 85 °C, for a
60 °C ambient temperature, instead of 160 °C, eliminating any stress on the ACST.
This 1 s duration is chosen in order to differentiate an abnormal over-current from the starting one, as ex-
plained below.
To sense an over-current, it is possible to measure the voltage across a shunt resistor placed in series with
the RUN ACST. Then, as the current is alternative, it must be clearly defined at which moment it must be
measured. Furthermore, this moment must be chosen in order to differentiate the over-current from the
normal current. Figure 8 gives the maximum and minimum currents for both operating conditions. These
curves come from experimental results where the mains voltage has been varied from 198 to 264 V RMS,
with and without a start capacitor.
Figure 8 shows that, in a stalled rotor condition, the current is still above 5.6 A between 6 and 8 ms after
Zero Voltage Crossing. In normal condition, the load current is always lower than 3 A at this moment.
The 5.6 A value is chosen as the limit to consider that the rotor is stalled. The MCU must then be able to
perform A/D conversions between 6 and 8 ms. Several measurements can be done in order to filter mea-
surement noise.
3.2 Protection by microcontroller
-8
-6
-4
-2
0
2
4
6
8
10
0
2
4
6
8
10
12
Istall max
Inorm max
Istall min
Current
(A)
Time (ms)
Fig. 8: Motor current maximum ranges
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AN6562) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier |
| AN6562S | 制造商:PANASONIC 制造商全稱:Panasonic Semiconductor 功能描述:Dual Operational Amplifiers |
| AN6564 | 制造商:PANASONIC 制造商全稱:Panasonic Semiconductor 功能描述:Quadruple Operational Amplifiers |
| AN6564) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier |
| AN6564NS | 制造商:Panasonic Industrial Company 功能描述:IC |
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