PS200 datasheet(10/36 Pages) MICROCHIP

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PS200

DS21891B-page 8

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.

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).

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).

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.

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.

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).

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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