Title:
VENTILATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/039753
Kind Code:
A1
Abstract:
Controlling switching elements (18, 20) according to the voltage output by a signal amplification circuit (14) makes it possible to adjust the voltage applied to a current calculation circuit (21). Further, even if a wide range of blowing amounts are used and the output range of a DC motor (2) is wide, that is, even if a wide range of currents flow through the DC motor, it is possible to enhance the accuracy with which the current of the DC motor is detected without it being necessary to reduce the resistance value of a shunt resistor (13) or the amplification factor of the signal amplification circuit.
Inventors:
NAKAGAKI TOMOYA
Application Number:
PCT/JP2020/031931
Publication Date:
March 04, 2021
Filing Date:
August 25, 2020
Export Citation:
Assignee:
PANASONIC IP MAN CO LTD (JP)
International Classes:
G01R19/00; F04D27/00; F24F7/007; G01R15/00; G01R15/09; H02P29/00
Domestic Patent References:
| WO1999028756A1 | 1999-06-10 |
Foreign References:
| JP2010216797A | 2010-09-30 | |||
| JPS63190974U | 1988-12-08 |
Attorney, Agent or Firm:
KAMATA Kenji et al. (JP)
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