US 12,289,070 B2
Electric motor control device
Akihiro Sawada, Tokyo (JP); and Makoto Matsumoto, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
Filed on Jan. 25, 2023, as Appl. No. 18/159,398.
Claims priority of application No. 2022-035053 (JP), filed on Mar. 8, 2022.
Prior Publication US 2023/0291344 A1, Sep. 14, 2023
Int. Cl. H02P 27/08 (2006.01); H02P 21/22 (2016.01); H02P 23/14 (2006.01)
CPC H02P 27/08 (2013.01) [H02P 21/22 (2016.02); H02P 23/14 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An electric motor control device, comprising:
switching circuitry including a switching element and configured to control power supplied to an electric motor;
current detection circuitry to output a detection signal corresponding to a current that flows in the electric motor;
interface circuitry to perform filtering processing on the detection signal; and
arithmetic processing circuitry to generate a control pulse for controlling the switching element,
the interface circuitry including a plurality of filters having time constants different from one another,
the arithmetic processing circuitry being configured to use, as a selected filter, a filter selected from among the plurality of filters based on a length of the control pulse, and use, as a detected current value, a value obtained by A/D conversion of a processed signal that is the detection signal on which the filtering processing has been performed with the selected filter.