参数资料
型号: ATEVK527
厂商: Atmel
文件页数: 15/35页
文件大小: 0K
描述: KIT EVAL PWM AVR USB 4 SERIES
标准包装: 1
系列: AVR®
主要目的: 电源管理,电池充电器
嵌入式: 是,MCU,8 位
已用 IC / 零件: ATmega16U4,ATmega32U4
主要属性: 1 芯锂离子电池
次要属性: 图形用户界面,USB 接口
已供物品:
AVR146
Figure 4-4. Flow chart of battery control function
4.4.3 Charge()
The charge function contains the charging algorithm divided into stages. For this
application, it has four stages:
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Prequalification - during which the battery is charged with a constant current
until a sufficient charge voltage is reached. If this happens within a given time
limit, the battery is considered good and the charger may continue on the
next stage. If time runs out before the voltage is reached, or battery
temperature goes out of limits, the battery is considered bad and charging is
halted.
Constant current charge - during which the battery is charged with a higher,
battery-specific current until the battery voltage reaches its maximum. If this
happens within the battery’s maximum charge time limit, the charger goes to
the next stage. If the time limit expires, or battery temperature goes out of
limits, the battery is considered bad and charging is halted.
Constant voltage charge – during which the battery is charged at the
maximum battery voltage until the charge current drops below a battery-
specific cut-off limit, or the maximum charge time limit expires. Here too,
charging is halted if battery temperature goes out of limits.
End charge – in which the charger decides whether to go into the sleep state,
or to attempt a charge of the other battery.
ChargeParameters and HaltParameters are key variables of this function. The
program flow of this state function is illustrated in the figure below.
15
7801A-AVR-06/08
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