| 摘要 |
A protection circuit includes a relay, a reset switch, a voltage conversion circuit, and a rectifier circuit. The voltage conversion circuit is connected to an AC power supply via the reset switch, and converts a voltage of the AC power supply to a low AC voltage. The rectifier circuit converts the low AC voltage to a direct current voltage and powers a coil of the relay. At least one item of electronic apparatus is powered by the AC power supply via contacts of the relay or the reset switch. If the main power is lost, the relay releases, and the power connection must be re-established by pressing the reset switch after the AC power supply has been restored, thus energizing the relay to latch on the AC power supply. |
