Power Supply - Toshiba TECRA S1 Maintenance Manual

1.8 Power Supply

1.8 Power Supply
The power supply unit provides many different voltages for the system board and performs
the following functions:
1. Power input monitor
• Checks whether the DC power supply (AC adapter) is connected to the computer.
• Checks whether the battery pack is connected to the computer.
• Monitors the DC power supply input voltage (AC Adapter output voltage).
2. Power supply's internal control
• Turns on and off the battery pack charging power supply.
• Issues a charging current instruction to the PWM control IC of the battery pack
charging power supply.
• Controls the supply of DC power supply input (AC Adapter output) to the power
supply unit.
• Controls the supply of power to the system block (load/logic circuit side).
• Controls forced shutdown if the power supply malfunctions.
3. Logic circuit control
• Instructs the gate array to enable/disable tuning the power on.
• Controls power-on/off operation.
4. Status display
• Turns on the DC IN LED (in orange or green).
• Battery indicator (in orange or green)
5. External interface
• Performs communication through the I2C bus (via the internal EC/KBC).
• Transfers the power supply operation mode.
6. Output monitor
• Monitors the voltage output to the system block (load/logic circuit side).
• Monitors the voltage, overvoltage, input/output current of the battery pack.
• Monitors the internal temperature of the battery pack.
• Monitors the supply voltage from the AC adapter.
TECRA S1 Maintenance Manual
1 Hardware Overview
1-17