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12-07-0005

PT0268-1

07/05/12

3

PT8A2707-12/17-19

Charger Controller

with Fuel-Guage & LCD/LED Display

Flow Chart

IDLE

PRE

CHARGE

MOTOR

FAST

CHARGE

FULL

CHARGE

STOP

CHARGE

> 55C

cord

on/off

motor

on/off

(2)(3)(4)

Full

Bat.

(6)

cord on/off

(7)

POWER UP

(1)

Notes:

1)

The system goes to idle when it is power-up. The system is waked up when cord is plugged, motor is turned on

or both.

2)

Motor is turned on/off by tact switch or slide switch.

3)

Motor will be turned off automatically when:

a)

the voltage of the battery pack is lower than 1.8V or (adjustable externally);

b)

the motor is drawing current more than the preset limit or (adjustable externally);

c)

the battery pack temperature is higher than 55C (adjustable externally)

4)

During charging when motor is turned on, the charging current is regulated at 1/10 of the fast-charging current.

When motor is turned off, the system will determine to go back to pre-charge/fast-charge/full-charge according

to the battery usage condition (more details could be obtained in the operation description).

5)

Enter fast-charging when

a)

battery temperature is less than 45C

b)

battery voltage is higher than 2V or after pre-charging for 3 minutes

6)

Enter full-charge state when one of the following full-charge criteria is reached:

a)

safety timer timeout (4 external selections)

b)

max. voltage 3.4V (adjustable externally)

c)

-∆V

d)

dT/dt (adjustable by component selections)

7)

If the battery pack is previously fully-charged without any usage or self-discharged enough, the charger goes

directly to maintenance (trickle charge) when cord is plugged again.

8)

Charger stops charging current when battery temperature is higher than 55C but resume for charging when

battery temperature falls below 45C

fast

chg

(5)

 45C

> 55C

(8)

(8)

motor

on/off

(2)(3)(4)

motor

on/off

(2)(3)

motor

on/off

(2)(3)(4)

motor

on/off

(2)(3)

 45C

cord

off

cord

off