Weighing strain sensor semaphore value transmission circuit, key unit and transmission method
A strain sensor and sensor technology, used in weighing, weighing equipment testing/calibration, weighing equipment using elastically deformable parts, etc. status and other issues to achieve the effect of reducing the additional temperature error
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specific Embodiment approach 1
[0061] The following is a specific implementation of the signal value transmission circuit of the weighing strain sensor of the present invention.
[0062] The signal value transmission circuit of the weighing strain sensor under the present embodiment, such as figure 1 As shown, the weighing strain sensor signal value transmission circuit is composed of a reference and analog-to-digital conversion unit, a strain bridge sensor measurement signal conditioning unit, a strain bridge sensor output signal conditioning unit and an internal monitoring signal selection unit;
[0063] The measurement signal conditioning unit of the strain bridge sensor and the output signal conditioning unit of the strain bridge sensor adopt a symmetrical structure; the measurement reference of the input strain signal is the same source as the excitation voltage provided to the bridge, and the reference of the output strain signal is the same as the bridge input The excitation voltage is the same sourc...
specific Embodiment approach 2
[0066] The following is a specific implementation of the signal value transmission circuit of the weighing strain sensor of the present invention.
[0067] The signal value transmission circuit of the weighing strain sensor in this embodiment, on the basis of the specific embodiment 1, further defines the reference and the analog-to-digital conversion unit, as follows figure 2 As shown, the reference and analog-to-digital conversion unit is composed of 1 voltage reference chip ADR4550, 2 precision operational amplifier chips OPA2277, 1 ADC chip ADS1282, 1 4.096MHz active crystal oscillator, multiple resistors and multiple capacitors, The reference and analog-to-digital conversion unit includes a reference conversion part and an analog-to-digital conversion part;
[0068] In the reference conversion part, the voltage reference chip U11 is ADR4550, the 2 pins of U11 are connected to +9V power supply, and the 4 pins are connected to AGND, and the parallel circuit composed of E1 ...
specific Embodiment approach 3
[0071] The following is a specific implementation of the signal value transmission circuit of the weighing strain sensor of the present invention.
[0072] The signal value transmission circuit of the weighing strain sensor in this embodiment, on the basis of the specific embodiment 1, further defines the measurement signal conditioning unit of the strain bridge sensor, as follows image 3 As shown, the strain bridge sensor measurement signal conditioning unit consists of a strain bridge sensor connection terminal, a dual 4-to-1 analog switch chip ADG659, an op-amp chip TLV2172 for excitation drive, and a zero-drift Composed of operational amplifier chip OPA2187 and multiple resistors; the terminals are connected to the weighing platform of the 6-wire Wheatstone strain bridge sensor, where PWR+ and PWR- are the differential excitation signals of the strain bridge sensor provided, and FBV+ and FBV- are the The feedback signal provided by the transformer bridge sensor to the cir...
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