Patent ID: 8867179
Filing Date: 2014-10-21
Classification: B60L,H02J,Y02T

Abstract:
1. A power source voltage protective device in which a state of a power source voltage supplied to a protection subject circuit unit is detected, the power source voltage protective device comprising: an AD converting section to which the power source voltage is supplied, said AD converting section being adapted to convert a reference voltage into a digital data using the received power source voltage and to output the digital data, wherein the power source voltage is supplied to both the protection subject circuit unit and the AD converting section; and a power source monitoring section adapted to detect the state of the power source voltage by calculating a voltage variation of the power source voltage based on a first conversion value and a second conversion value, wherein said first conversion value is obtained by AD-converting the reference voltage by the AD converting section in an ideal state in which a standard power source voltage including no voltage variation is supplied to the AD converting section, and wherein said second conversion value is obtained by AD-converting the reference voltage by the AD converting section in a real state in which the power source voltage including voltage variation is supplied to the AD converting section.