| 摘要 |
<p>PROBLEM TO BE SOLVED: To solve a problem that a main power supply of a computer cannot be set to an on-state though it can be set to an off-state from a keyboard. SOLUTION: When a main power supply 10 is at the off-state, power is supplied from a sub-power supply 11 to a USB controller 1A on the side of a keyboard device 1 and a power starting device 30 on the side of the computer 2. On the other hand, when supply of power to a line switching means 20 is cut off, switching parts 21, 22 are switched and signal lines D+, D- of the USB controller 1A are connected with input terminals 31a, 31b of a differential amplifier means 31 respectively. Thus, when a specific signal is outputted from the keyboard device 1, a power starting signal (power-on signal) is outputted from the power starting device 30 to the main power supply 10 and starting of the main power supply 10 is enabled.</p> |
