| 摘要 |
The present invention provides a relay-based foolproof circuit for over-voltage protection, which is electrically connected between a plug and an electric device, and includes a relay having at least one magnetic core, a coil wound around the magnetic core and two reed switches each having a reed and being normally in a closed state because of the elastic effect of its reed. The relay-based foolproof circuit is able to provide AC power of a first specification (e.g., 110 V AC power) received from the plug to the electric device. However, when AC power of a second specification (e.g., 220 V AC power) greater than the first specification flows through the coil, the coil causes the magnetic core to generate a magnetic force great enough to drive the two reed switches into an open state for stopping the AC power of the second specification from being provided to the electric device. |
| 主权项 |
1. A relay-based foolproof circuit for over-voltage protection, electrically connected between a plug and an electric device, wherein the plug is configured for connecting with an alternating-current (AC) power source in order to receive AC power provided by the AC power source, and the electric device can be properly driven only by AC power of a first specification, the relay-based foolproof circuit comprising a relay, the relay comprising:
a first reed switch which, due to an elastic effect of a reed thereof, is normally in a closed state; a second reed switch which, due to an elastic effect of a reed thereof, is normally in a closed state; at least one magnetic core corresponding to the first reed switch and the second reed switch; and a coil wound around the magnetic core so that, when AC power of a second specification flows through the coil, the coil causes the magnetic core to generate a magnetic force great enough to drive the reeds of the reed switches, thereby bringing the reed switches to an open state, wherein the AC power of the second specification has a voltage value greater than a voltage value of the AC power of the first specification. |
