Patent ID: 8922218

Claim:
A detection circuit comprising: a sensing unit that provides a sensed signal and a bias signal by sensing an input signal representing a status of a battery; a signal reference source, coupled to said sensing unit and comprising a reference node, that determines a signal reference at said reference node and that receives and is biased by said sensed signal at said reference node to generate a trigger signal indicative of a difference between said sensed signal and said signal reference, wherein said signal reference source comprises: a first transistor and a second transistor, coupled to said reference node, that receive and are biased by said sensed signal via said reference node; and a third transistor and a fourth transistor, coupled to a connection node, that receive and are biased by said bias signal via said connection node, wherein said third transistor comprises a first terminal coupled to said first transistor and comprises a second terminal coupled to said connection node, and wherein said fourth transistor comprises a first terminal coupled to said second transistor and comprises a second terminal coupled to said connection node; and a detecting unit, coupled to said signal reference source, that generates an output signal according to said trigger signal to indicate an abnormal condition is present in said battery.