Title:
TORQUE MEASUREMENT WITH COMPENSATION FOR STRAIN GAUGE BIAS
Document Type and Number:
WIPO Patent Application WO/2023/193180
Kind Code:
A1
Abstract:
An apparatus such as an electronic torque wrench (100) is provided that includes a strain gauge assembly (202), differential voltage amplifier circuit (204), analog-to-digital converter (ADC) (206) and processing circuitry (208). The strain gauge assembly (202) measures an applied torque, and produces an analog electrical signal that varies in voltage with the applied torque; and the differential voltage amplifier circuit (204) amplifies the analog electrical signal to produce an amplified analog electrical signal. The strain gauge assembly (202) has a characteristic analog signal produced without any applied torque, and the differential voltage amplifier circuit (204) is biased to a bias voltage that is calibrated to reduce the characteristic voltage in the amplified analog electrical signal. The ADC (206) converts the amplified analog electrical signal to an equivalent digital electrical signal. And the processing circuitry (208) determines the torque value of the applied torque from the equivalent digital electrical signal, and outputs an indication of the torque value.
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Inventors:
SUN BIN (CN)
HE JIANGMING (CN)
LUO HENGLIAN (CN)
HE JIANGMING (CN)
LUO HENGLIAN (CN)
Application Number:
PCT/CN2022/085529
Publication Date:
October 12, 2023
Filing Date:
April 07, 2022
Export Citation:
Assignee:
APEX BRANDS INC (US)
International Classes:
G01L3/02; G01L3/10
Foreign References:
| US5497667A | 1996-03-12 | |||
| US20110162493A1 | 2011-07-07 | |||
| US20070119269A1 | 2007-05-31 | |||
| US20120132042A1 | 2012-05-31 | |||
| US4522075A | 1985-06-11 | |||
| US5406834A | 1995-04-18 | |||
| JP3001881B1 | 2000-01-24 |
Attorney, Agent or Firm:
BEIJING WANHUIDA LAW FIRM (CN)
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