Patent ID: 11933854
Assignee: NUVOTON TECHNOLOGY CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC B  G  H  Y | IPC B  G  H

Claim 0:
1. A battery management circuit that manages a secondary battery, the battery management circuit comprising:
a reference signal generator that generates a first reference frequency signal and a second reference frequency signal having a phase different from a phase of the first reference frequency signal;
an alternating-current superimposer that superimposes an alternating current on the secondary battery, the alternating current having a frequency component of the first reference frequency signal;
a voltage measurer that measures a voltage of the secondary battery by performing sampling using a frequency higher than a frequency of the first reference frequency signal;
a current measurer that measures a current of the secondary battery by performing sampling using a frequency higher than the frequency of the first reference frequency signal; and
a converter that converts each of results of measurements by the voltage measurer and the current measurer into a real part component and an imaginary part component of each of a complex voltage and a complex current, by multiplying the result of the measurement by the first reference frequency signal and the second reference frequency signal,
wherein the voltage measurer and the current measurer repeatedly measure a voltage and a current of the secondary battery, respectively, and
the battery management circuit comprises an integrator that averages real part components and imaginary part components of complex voltages and complex currents, respectively, the complex voltages and the complex currents corresponding to the repeated measurements.