Patent ID: 8922216

Claim:
An apparatus comprising a voltage measuring device for an accumulator of a battery, said accumulator having a positive pole and a negative pole, said battery comprising at least two accumulators connected in series with each other, said measuring device comprising an alternating current generator, at least one first diode having a first-diode cathode and a first-diode anode, and at least one second diode having a second-diode cathode and a second-diode anode, said first and second diodes being connected in series with each other, said first diode being linked to said positive pole by said first-diode cathode and to said second-diode cathode by said first-diode anode, said second diode being linked to said negative pole by said second-diode anode and to said first-diode anode by said second-diode cathode, a reading capacitor linked to said alternating current generator, to a mid-point between said first and second diodes, and to a means for determining voltage at said accumulator based at least in part on voltage variation at said mid-point, said means for determining voltage comprising a rectifying third diode having a third-diode anode and a third-diode cathode, and a rectifying fourth diode having a fourth-diode anode and a fourth-diode cathode, said third diode and said fourth diode being connected in series such that said third-diode anode is linked to said fourth-diode cathode and to said reading capacitor, a filtering capacitor linked to said third-diode cathode and to said fourth-diode anode, and a resistor mounted in parallel with said filtering capacitor, said apparatus further comprising first and second diodes in series with each other and in parallel with each of said accumulators in series with each other, and link capacitors linking consecutive mid-points between first and second diodes, said link capacitors being arranged in series with each other.