Invention Grant
- Patent Title: Relay-based foolproof circuit for over-voltage protection
- Patent Title (中): 基于继电器的防盗电路,用于过电压保护
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Application No.: US14313487Application Date: 2014-06-24
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Publication No.: US09401604B2Publication Date: 2016-07-26
- Inventor: Chung-Wang Lee , Pao-Ching Hu , Huai-Tung Lee
- Applicant: Alpha Networks Inc.
- Applicant Address: TW Hsinchu
- Assignee: ALPHA NETWORKS INC.
- Current Assignee: ALPHA NETWORKS INC.
- Current Assignee Address: TW Hsinchu
- Agency: Bacon & Thomas, PLLC
- Priority: TW103112272A 20140402
- Main IPC: H02H3/20
- IPC: H02H3/20 ; H02H11/00

Abstract:
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.
Public/Granted literature
- US20150288168A1 RELAY-BASED FOOLPROOF CIRCUIT FOR OVER-VOLTAGE PROTECTION Public/Granted day:2015-10-08
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