Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
NOISE REMOVAL CIRCUIT, NOISE REMOVAL METHOD, AND MOTOR CONTROL DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/077889
Kind Code:
A1
Abstract:
This noise removal circuit 1 has: a differential amplifier circuit 11 for amplifying and outputting a voltage change signal indicating the change of motor drive current; a V/I conversion unit 12 for converting a control signal formed on the basis of the voltage change signal into a current signal; and a current mirror circuit 13 for controlling the gain of the differential amplifier circuit 11 by changing the tail current of the differential amplifier circuit 11 on the basis of the current signal from the V/I conversion unit 12. The noise removal circuit 1 controls the tail current so that the gain of the differential amplifier circuit 11 reduces as the voltage of the voltage change signal increases. When spike noise is included in the voltage change signal, by reducing the tail current to limit the gain, the amount of amplifying a spike noise portion is suppressed and a signal from which the spike noise is removed is output.

Inventors:
YANAGITA Yuichi (2681 Hirosawacho 1-chom, Kiryu-shi Gunma 55, 〒3768555, JP)
UCHIDA Takuya (2681 Hirosawacho 1-chom, Kiryu-shi Gunma 55, 〒3768555, JP)
Application Number:
JP2018/031944
Publication Date:
April 25, 2019
Filing Date:
August 29, 2018
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
MITSUBA CORPORATION (2681, Hirosawacho 1-chome Kiryu-sh, Gunma 55, 〒3768555, JP)
International Classes:
H02P7/06; G01R19/00; H03G3/30
Foreign References:
JPH0523798U1993-03-26
JPH06244745A1994-09-02
JP2015184142A2015-10-22
JPH10123053A1998-05-15
Attorney, Agent or Firm:
TAKANO Yasushi (TAKANO & PARTNER, Miyamasuzaka-Toho-Estate 602 1-12-12, Shibuy, Shibuya-ku Tokyo 02, 〒1500002, JP)
Download PDF: