| 摘要 |
<p>A power-switching device (such as a gate-controlled TRIAC) is used to connect and disconnect a computer system's power supply unit from the power-line connection. This power-switching device is controlled by a battery-powered circuit. The battery-powered circuit monitors a contact pad, and powers up the system when the user touches the contact. Thus, when the system is powered down, all parts of the system are disconnected from AC power.</p> |
