发明名称 |
Halbleiter-Dehnungs-Sensor mit Kompensationsschaltung für die Eingangsspannung einer Wheatstonebrücke |
摘要 |
A drive circuit for a strain sensor includes a Wheatstone bridge (5) having semiconductor strain gauges (1-4). A temperature-dependent voltage generator (10) generates a voltage having a predetermined ambient temperature dependency characteristic, a constant voltage generator (11) generates a predetermined constant voltage, and a proportional voltage generator (12) generates a voltage proportional to an externally supplied power source voltage (VCC). A voltage processor (13) receives and arithmetically processes output voltages of the temperature-dependent voltage generator (10), the constant voltage generator (11) and the proportional voltage generator (12) to generate a bridge drive voltage (V13) which changes from a mid value to a predetermined voltage depending on a temperature proportional to the power source voltage. In an amplifier circuit for amplifying a strain output signal from the Wheatstone bridge, both the potentials across an AC coupling capacitor are kept to be equal at a steady-state operation. Detection sensitivity variations due to the temperature dependency characteristic of the strain gauges can be effectively compensated. |
申请公布号 |
DE69413318(D1) |
申请公布日期 |
1998.10.22 |
申请号 |
DE1994613318 |
申请日期 |
1994.06.24 |
申请人 |
NEC CORP., TOKIO/TOKYO, JP |
发明人 |
MIYANO, SOICHIRO, C/O NEC CORPORATION, MINATO-KU, TOKYO, JP |
分类号 |
G01B7/16;G01D3/028;G01L1/22;G01L9/06;H03F3/68;(IPC1-7):G01L1/22 |
主分类号 |
G01B7/16 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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