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 18:
19. 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, the 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 measure a voltage and a current of the secondary battery repeatedly,
the secondary battery includes a plurality of battery cells connected in series,
the battery management circuit comprises a multiplexer that selects one battery cell from the plurality of battery cells,
the voltage measurer includes at least one analog-to-digital converter for measuring a voltage of the secondary battery, and
the at least one analog-to-digital converter of the voltage measurer is one analog-to-digital converter and measures a voltage of the one battery cell selected by the multiplexer.