Overvoltage-proof circuit capable of preventing damage caused by overvoltage

摘要

The present invention discloses an overvoltage-proof circuit capable of preventing damage caused by an overvoltage at moments of starting and/or stopping operation. An embodiment of the overvoltage-proof circuit includes a protected circuit and a protecting circuit. The protected circuit receives a power supply voltage to operate, and includes: a protected component, in which an upmost voltage that the protected component can withstand is lower than the power supply voltage; and at least one operational switch(es) operable to enable or disable the protected circuit according to an enabling signal. The protecting circuit is coupled to the protected component, and starts protecting the protected circuit from an overvoltage before a transition of the enabling signal, in which the overvoltage is greater than the upmost voltage.