Signal processing apparatus, motor, and fan motor
US11025182B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 31, 2019 |
| Grant date | Jun 1, 2021 |
| Priority date | — |
| Expiry date | Dec 2, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/08
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A signal processing apparatus includes a processor, a memory storing a program, and an integration circuit that performs filter processing on an input signal to output a processed signal. The processor samples an output signal output from the integration circuit in a sampling period Ts and stores a sampled value of the output signal in accordance with the program, and detects a duty of the input signal based on a difference between a value of the output signal at a time t0 representing a present time point and a sampled value of the output signal obtained at a time t0−n representing an earlier time than the time t0 by an n sampling period when n is a positive integer, the value of the output signal, a value of the integer n, the sampling period Ts, and a time constant of a filter of the integration circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.