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PS200 Datasheet(PDF) 10 Page - Microchip Technology |
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PS200 Datasheet(HTML) 10 Page - Microchip Technology |
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10 / 36 page  PS200 DS21891B-page 8 © 2005 Microchip Technology Inc. 2.2.5 CURRENT REGULATION STATE The Current Regulation state can be entered from the Precharge state or Charge Qualification state. Battery charging is initiated. This state provides constant current, voltage limited charging (refer to Figure 2-2). The charge current is referred to as IREG or the regula- tion current. While the current is applied, the battery’s voltage increases until it reaches a voltage limit referred to as VREG or regulation voltage. Charging continues, during which battery voltage and tempera- ture are monitored. There are three possible next states. 1. If the battery’s voltage reaches or exceeds the voltage limit, VREG and its temperature remains below the maximum allowable during current regulated charging (TMAXCHG), then the next state is Voltage Regulation (F). 2. If the battery exhibits any one of the following conditions then the next state is Charge Suspend (C): - Battery voltage exceeds upper voltage limit for charging (VMAX) - Battery temperature exceeds upper temperature limit for charging (TMAX) - Battery temperature is below the lower temperature limit for charging (TMIN) If the time in the Current Regulation state exceeds the time limit (ti), then the next state is Charge Suspend (C). 3. If the battery pack is taken away (BATPRES = 0), then the PS200 enters the Charge Pending (A) state. 2.2.6 VOLTAGE REGULATION STATE Voltage Regulation provides charging at a constant voltage while the charge current decreases (or tapers) to the user specified minimum current threshold (IMIN). There are three possible next states. 1. When the charge current reaches the taper current threshold for End-Of-Charge (IMIN) and the battery’s voltage remains at the regulated voltage value (VREG), then the battery has reached the Charge Complete (G) state. 2. If the battery exhibits any one of the following conditions, then the next state is Charge Suspend (C). - Battery voltage exceeds upper voltage limit for charging (VMAX) - Battery temperature exceeds upper temperature limit for charging (TMAXCHG) If the time in the Voltage Regulation state exceeds the time limit (tv), then the next state is Charge Suspend (C). 3. If the battery pack is taken away (BATPRES = 0), then the PS200 enters the Charge Pending (A) state. 2.2.7 CHARGE CYCLE COMPLETE STATE The user specified minimum current threshold (IMIN) can be configured for various charging temperatures. At this threshold, charging is terminated and the End- Of-Charge state is reached. The PS200 can renew the charge cycle by entering the Charge Pending (A) state when: 1) the battery is removed (BATPRES = 0), or 2) if the battery’s voltage falls below the recharge threshold voltage (VRCHG). FIGURE 2-2: PS200 CHARGING PROFILE Time Precharge Battery Voltage Charge Current Current Regulation Voltage Regulation VREG IREG IMIN |
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