參數(shù)資料
型號: ICS1708N
廠商: Electronic Theatre Controls, Inc.
英文描述: IC REG LDO 1A 10V TO220FP
中文描述: QuickSaver充電控制IC的鎳鎘和鎳氫電池
文件頁數(shù): 3/16頁
文件大?。?/td> 936K
代理商: ICS1708N
3
ICS1708
SoftStart
Conditioning Charge
New, over-discharged, and batteries out of long term storage may exhibit an initial high impedance conditions in response to charging, as
shown in Figure 2. Unless dealt with, this high impedance condition can cause a voltage peak and -
V condition at the beginning of the
charge cycle that can appear to be the response of an already full battery. To manage this condition, the
ICS1708
applies a
SoftStart
conditioning charge.
Figure 2: High impedance voltage spike at the beginning of charge
The
SoftStart
charge eases batteries into the fast charge stage by gradually increasing the duty cycle of the charge. The gradual increase
alleviates the voltage peak and the -
V condition. The duty cycle of the applied current is increased to the fast charge rate, as shown in
Figure 3, by extending the current pulse on every cycle until the pulse is about 1.1 seconds in duration. The initial current pulse is
approximately 200ms. The CMN indicator is a continuous active low during the
SoftStart
conditioning stage.
Figure 3: Cycle-to-cycle increase of the
SoftStart
current pulse widths
Initial Pulse
Width
cycle time
cycle time
cycle time
Initial Pulse
Width
Initial Pulse
Width
increment
time
2 x increment
time
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