Patent ID: 7166990

Claim:
A battery low-voltage protecting device including: an input terminal connected, via a first lead wire and a switch driver circuit, with a positive terminal of a battery; an output terminal connected, via a second lead wire, with a load; a ground terminal connected, via a third lead wire, with an automobile body and a negative terminal of said battery; a declining voltage integrating circuit; a voltage detector; and a timer switch control circuit; wherein the voltage of said declining voltage integrating circuit is adapted to rise when the voltage of said battery rises, and is adapted to fall when the voltage of said battery falls; wherein said declining voltage integrating circuit is adapted to differentiate between a quick fall in the voltage of the battery from a slow fall in the voltage of the battery, and to output voltage signals to said voltage detector; wherein said voltage detector is adapted to receive voltage signals outputted by said declining voltage integrating circuit, to compare said voltage signals with a pre-defined voltage level, and to output voltage signals to said switch driver circuit; wherein said timer switch control circuit is adapted to delay said battery low-voltage protecting device from performing voltage checking by a pre-defined period of time; and wherein said switch driver circuit is adapted to selectively open and close the connection among said declining voltage integrating circuit, said load and said positive terminal of said battery, whereby when said connection among said declining voltage integrating circuit, said load and said positive terminal of said battery is disconnected, said battery is completely disconnected from all electricity-consuming appliances of said automobile.