Patent ID: 9658606
Date: 2017-05-23
CPC Classifications: G05B,G06F,H02H

Claim:
1. A protection circuit for an electronic device comprising: a first power supply; a spring mechanical switch attached to a chassis of the electronic device; a plurality of second power supplies with different voltages; and a plurality of electronic switches; wherein the spring mechanical switch comprises a first terminal coupled to the first power supply and a second terminal that is grounded; first pins of the electronic switches are coupled to the first terminal; second pins of the electronic switches are respectively coupled to the second power supplies; and third pins of the electronic switches are capable of powering a motherboard of the electronic device; when a cover of the electronic device covers the chassis, the spring mechanical switch is pressed and the first terminal and the second terminal are connected, the electronic switches are turned on, and the third pins of the electronic switches output voltages to the motherboard; when the cover is detached from the chassis, the mechanical switch rebounds, the first terminal disconnects and the second terminal are disconnected, the electronic switches are turned off, and no voltages output from the third pins of the electronic switches.