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參數(shù)資料
| 型號(hào)： | AN1358S(AN6562S) |
| 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(yè)數(shù)： | 8/10頁(yè) |
| 文件大?。?/td> | 118K |
| 代理商： | AN1358S(AN6562S) |
APPLICATION NOTE
8/10
A PTC thermistor presents a very low resistance when it is cold (example: 10
at 25 °C). This enables a
high inrush current at motor start-up to be applied.
Then, the PTC begins to heat and its impedance rapidly increases. This allows the current to decrease by
just a few mAmps, compared to several Amps at the beginning. Figure 10 shows this current at steady
state. This figure also gives the dissipated power through the PTC at this moment. It can be said that the
PTC continuously absorbs 2.1 W, when the motor is on. This power consumption can be gained simply by
removing this component and using two triacs instead of one, to drive the motor.
4.2.1 PTC losses
4.2 Power consumption
Fig. 10: PTC power consumption at steady state
A very efficient way to reduce the power consumption is to control more accurately the temperature.
Some tests have been performed on a half-loaded 350 L freezer, controlled by our electronic thermostat.
During the tests, the door is kept closed and the load remains the same.
Figures 11 and 12 give the power consumption and the evaporator and cabinet temperatures for respec-
tively a 5.3 °C and 4.2 °C control law Hysteresis threshold.
The measurements, shown on Table 1, have been done for the following cases:
a/ Case 1: Hysteresis Threshold = 5.3 °C (similar to mechanical thermostat feature)
b/ Case 2: Hysteresis Threshold = 4.2 °C.
4.2.2 Motor duty cycle
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