Patent ID: 7372683
Filing Date: 2008-05-13
Classification: H02H

Abstract:
1. A power source circuit comprising a power source that outputs a DC (Direct Current) voltage and an over voltage detection circuit comprising a voltage comparator connected to the power source that detects that the DC voltage output from the power source has reached a predetermined setting voltage, wherein said over voltage detection circuit has two or more different response speeds and two or more different setting voltages each corresponding to one of the response speeds for over voltage detection for said power source to provide two or more independent determinations of an overvoltage condition, wherein said over voltage detection circuit provides said two or more different response speeds and said two or more different setting voltages for one power source, and wherein said voltage comparator outputs a first stop signal to stop operation of the power source in accordance with one of the different response speeds and one of the different setting voltages, and outputs a second stop signal to stop operation of the power source in accordance with another one of the different response speeds and another one of the different setting voltages, wherein the voltage comparator outputs the first and second stop signals independently of one another.