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ICS1722MT Datasheet(PDF) 6 Page - Galaxy Power, Inc. |
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ICS1722MT Datasheet(HTML) 6 Page - Galaxy Power, Inc. |
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6 / 24 page  6 ICS1722 Cells that are not thoroughly conditioned or possess an unusual cell construction may not have a normal voltage profile. The ICS1722 uses an alternate method of charge termination based on a slight decrease in the voltage slope to stop charge to cells whose voltage profile is very shallow. This method looks for a flattening of the voltage slope which may indicate a shallow peak in the voltage profile. The zero slope point occurs slightly beyond the peak voltage and is shown on the voltage curve graph. Charge Timer Termination The controller uses a timer to limit the fast charge duration. These times are pre-programmed, and are automatically adjusted in time duration according to the charge rate selected. Fast charge timer termination is a safety backup feature to limit the duration of the fast charge stage. The fast charge timer is always enabled and cannot be disabled. See Table 3 in the section Charge Rate Selection for more information. To limit the total charge time to ten hours, refer to the section Ten Hour Timer Mode for more information. Charge Termination Methods Charge termination schemes include voltage slope, fast charge timer and, if desired, a ten hour timer to limit total charge time. Voltage Slope Termination The most distinctive point on the voltage curve of a charging battery in response to a constant current is the voltage peak that occurs as the cell approaches full charge. By mathematically calculating the first derivative of the voltage, a second curve can be generated showing the change in voltage with respect to time as shown in Figure 6. The slope will reach a maximum just before the actual peak in the cell voltage. Using the voltage slope data, the ICS1722 calculates the point of full charge and accurately terminates the applied current as the battery reaches that point. The actual termination point depends on the charging characteristics of the particular battery. Figure 6: Voltage and slope curves showing inflection and zero slope points |
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