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Weighting sensor preamplifier circuit

A technology of preamplifier circuit and weighing sensor, which is applied in the direction of weighing equipment, instruments, and weighing using elastically deformable parts, and can solve problems such as complicated circuits.

Active Publication Date: 2012-10-10
FOREVER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The output voltage of the standard load cell preamplifier circuit on the market is generally 0-5V. When the CPU chip uses DSP or FPGA chips, it is necessary to convert the standard 0-5V signal into a non-standard 0-3.3V. lead to complex circuits

Method used

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  • Weighting sensor preamplifier circuit
  • Weighting sensor preamplifier circuit
  • Weighting sensor preamplifier circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] See figure 1 As shown, the load cell preamplifier circuit is a circuit board. The circuit board is provided with a USB interface circuit, a -5V power conversion circuit, an instrument amplifier amplification circuit, a sensor input interface circuit and a circuit board output interface circuit.

[0015] Such as figure 2 , 3 , 4, and 5, in the circuit board, the 1st and 4th pins of the USB interface circuit are respectively connected to the 5V power supply and ground wire to provide 5V power supply and ground wire for the entire circuit board; the USB interface circuit is connected to the ICL7660 chip, which is the ICL7660 The chip provides power and ground; capacitors C1 and C2 are connected in series between pins 2 and 4 and pins 5 and 3 of the ICL7660 chip respectively, and play the role of charging and discharging during the chip conversion process, while the 5th pin of the ICL7660 chip outputs -5V voltage; the USB interface circuit and the ICL7660 chip provide 5...

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PUM

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Abstract

The invention relates to a weighting sensor preamplifier circuit, in particular to a sensor preamplifier circuit with adjustable output voltage in the range of 0 to 5V. The weighting sensor preamplifier circuit is a circuit board. The circuit board is provided with a USB interface circuit, a 5V power conversion circuit, an instrument amplifier amplifying circuit, a sensor input interface circuit and a circuit board output interface circuit. The invention has the advantages of simple structure, reliable performance, adjustable voltage output range and good measuring accuracy, and is suitable for daily life and industrial process control.

Description

technical field [0001] The invention relates to a load cell preamplifier circuit, in particular to a sensor preamplifier circuit with 0-3.3V output or 0-5V voltage output. Background technique [0002] The resistance strain gauge load cell can be simplified into a Wheatstone bridge. When the sensor bears a certain load, the resistance value of the resistance will shift symmetrically. When the sensor is energized, the output signal of the sensor will be proportional to the applied load. Scale, change the weight value into a measurable analog signal, after the analog signal is processed by the pre-amplification circuit, A / D conversion and CPU, the weighing data is sent out. Due to the input of the power grid, the ground potential, etc. form a common-mode interference signal, and the voltage formed by the coupling induction between the signals by the space electromagnetic field and the conversion of the common-mode interference by the unbalanced circuit, the common-mode interfe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01G3/142
Inventor 吴琴琴
Owner FOREVER TECH