Patent ID: 7847519

Claim:
A battery protector with internal impedance compensation, said battery protector comprising: a logic circuit and delay module; an overcharge comparator having a negative terminal connected with a first reference signal and a positive terminal connected with a first detected signal, said overcharge comparator then outputting a first output signal to said logic circuit and delay module for generating a first response signal to turn off a first switch while said first detected signal is higher than said first reference signal; an over-discharge comparator having a positive terminal connected with a second reference signal and a negative terminal connected with said first detected signal, said over-discharge comparator then outputting a second output signal to said logic circuit and delay module for generating a second response signal to turn off a second switch while said first detected signal is lower than said second reference signal; wherein said first reference signal is generated by a first reference signal adjustable generator having a first operational amplifier, using a voltage V VM on a pin VM of the battery protector and a first internal threshold signal as two input signals, and said first internal threshold signal is fed through a first voltage divider to a positive input terminal of said first operation amplifier, said first reference signal being outputted varied with the internal impedance of a battery to be protected; wherein said second reference signal is generated by a second reference signal adjustable generator having a second operational amplifier using said voltage V VM and a second internal threshold signal as two input signals and said second internal threshold signal is fed through a second voltage divider to a positive input terminal of said second operational amplifier, said second reference signal being outputted varied with the internal impedance of the battery.