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參數(shù)資料
| 型號： | ICS1702N |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | QuickSaver Charge Controller for Nickel-Cadmium and Nickel-Metal Hydride Batteries |
| 中文描述： | QuickSaver充電控制器的鎳鎘和鎳氫電池 |
| 文件頁數(shù)： | 7/28頁 |
| 文件大小： | 466K |
| 代理商： | ICS1702N |
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7
ICS1702
Figure 8: Cell temperature and
thermistor voltage slope
Table 1 shows the decrease in thermistor voltage the last minute
before full charge required by the
ICS1702
at various charge rates.
The thermistor voltage slope should exceed the listed value to
ensure charge termination. Note that changes in thermistor
location, cell size or large ambient temperature fluctuations can
affect the slope to some degree. Refer to the
Applications
Information
section and
Temperature Slope and Maximum
Temperature
section for more information on thermistor mounting.
Table 1: Slope vs. Charge Rate
Temperature Slope Termination
Temperature slope termination is based on the battery producing an
accelerated rate of heating as the amount of readily chargeable
material dimishes at full charge. An increase in battery (cell)
heating due to the charging reaction will occur at a much faster rate
than a change due to a warming ambient temperature. Note the
effect of 0.5
°
C fluctuations in ambient temperatures resulting in
slight variations in the temperature slope as shown in Figure 7.
However, the increase in cell temperature near the end of charge
causes a much larger change in the temperature slope that can be
easily detected and used as a trigger for fast charge termination.
Figure 7: Cell temperature and
temperature slope
The rate of change in cell temperature can be determined by
measuring the change in voltage across a negative temperature
coefficient thermistor as shown in Figure 8. The resistance of an
NTC thermistor changes in proportion in the change in temperature
of the thermistor. The
ICS1702
measures the decreasing resistance
as a drop in voltage and calculates the thermistor voltage slope,
shown in Figure 8. The controller terminates fast charge based on
the selected charge rate and the calculated slope.
Charge Rate
Thermistor Voltage Slope
(-V/min.)
0.040
0.028
0.018
>C/2
C/2 to C/3
<C/3
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