Kabushiki Kaisha Toshiba

Yasuhiro Ohashi

Kazuya Shibasaki

Hironori Ito

Masahiko Kasashima

A power source device of an expansion unit determines whether an electric device is connected to the expansion unit, and supplies an operating power source voltage CC to the electric device only when the electric device is connected to the expansion unit. Further, the power source device outputs a preset command to the electric device, and supplies a charging power source voltage B-CC to the electric device in accordance with device kind indicating information output from the electric device in response to the preset command. Also, when the power supply device of the expansion unit is in an abnormal state, the power supply device of the expansion unit detects the abnormal state, and outputs the electric device to a state signal representing the abnormal state and execute power source interruption processing of the power source device. In the electric device, power source interruption processing of a power source device of the electric device is performed in response to the state signal.

Power source control system for electronic device and expansion unit

In a computer unit capable of connecting an expansion unit and having a resume function, when a system power source is turned on, it is determined whether or not the resume function is set. If the resume function is set, it is determined whether or not an expansion unit is connected to the computer unit. If no expansion unit is connected to the computer unit, the resume process is executed. When an expansion unit is connected to the computer unit, a warning message is output. A sound signal corresponding to the warning message is generated by a sound generator, and a light signal corresponding to the warning message is generated by an LED (light emitting diode).

Method and system for controlling resume process in computer unit

In a battery-driven computer system, a flip-flop circuit selects one of two switches for switching a power supply to the computer system in accordance with the terminal voltages of batteries detected by detecting circuits. When the first switch is switched on, the first battery coupled to the first switch supplies its power to the computer system. In this case, the second switch is switched off and the power from the second battery coupled to the second switch is not supplied to the computer system. When the terminal voltage of the first battgnal representing the power condition of the batteries.

Growing community of inventors

Tokyo, Japan

Yasuhiro Ohashi