Toshiba satellite a20 series 用户手册

1.9 Power Supply 

 

The power supply distributes many different voltages to the system board and performs the 
following functions: 
 

1.  Input port management 

• 

AC adaptor connection 

• 

Battery pack installation 

• 

The voltage of AC adaptor (both IN and OUT) 

 

2.  Power supply internal control 

• 

Battery pack charging status (ON/OFF) 

• 

Controls DC voltage output by AC Adaptor 

• 

Regulates power supply to system components (load and logic circuits) 

• 

Controls circuit breakers in event of a power supply malfunction 

 

3.  Management of power to logic circuits 

• 

Controls power to the CPU 

• 

Regulates power supplied to gate arrays 

• 

Controls ON/OFF power 

 

4. Status indicators 

• 

DC IN LED 

• 

Battery LED 

 

5.  External device interface 

• 

Monitors I

2

C bus connections through EC/KBC on the system board. 

• 

Transmits the power supply mode. 

 

6.  Monitors power output 

• 

Power to systems components (load and logic circuits) 

• 

Battery pack voltage, overvoltage and I/O current 

• 

Battery pack internal temperature