Control circuit for weighing sensor

A technology of weighing sensor and control circuit, applied in the direction of logic circuit interface device, detailed information of weighing equipment, logic circuit connection/interface layout, etc. Changes and other issues to achieve the effect of simple structure, flexible selection, and flexible matching

Pending Publication Date: 2019-03-22
METTLER TOLEDO (CHANGZHOU) MEASUREMENT TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two wiring methods have their own advantages and disadvantages: in the four-wire connection method, such as figure 1 As shown in a, the weighing sensor has no special requirements for the instrument, and it is more convenient to use, but when the cable is long, it is easily affected by the interference caused by factors such as ambient temperature fluctuations, thereby affecting the measurement performance of the electronic weighing instrument; the six-wire system In connection, such as figure 1 As shown in b, the weighing sensor requires the instrument used with it to have a feedback input interface, such as feedback (+) and feedback (-), the scope of use has certain limitations, but it is not easy to be affected by factors such as ambient temperature fluctuations It has certain advantages in precision measurement and long-distance measurement
However, the conversion of this scheme can only be carried out at the same time when the load cell is installed, once the setting between R1, R2 and 0 ohm resistance is completed, it cannot be changed
Moreover, this solution only involves how the six-wire sensor realizes the four-wire system, and does not involve how the four-wire sensor realizes the six-wire system, so as to connect six-wire external devices

Method used

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  • Control circuit for weighing sensor
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  • Control circuit for weighing sensor

Examples

Experimental program
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Effect test

Embodiment 1

[0034] figure 2 It shows the connection structure diagram of the load cell and the six-wire signal processing equipment of the present invention.

[0035] like figure 2 As shown, the connector 201 includes six terminals A~F and the six interfaces a~f of the signal processing device 203 respectively correspond to excitation (+), feedback (+), output (+), output (-), excitation ( -) and feedback (-), terminals C and D are directly connected to interfaces c and d of the signal processing device 203 respectively, and an analog switch 202 is respectively set between terminals A and B, and between terminals E and F. When the signal processing device 203 is a six-wire system, the analog switch 202 is set so that the terminals A, B, E, and F are respectively connected to the interfaces a, b, e and f of the signal processing device 203; when the signal processing device 203 is a four-wire system , the analog switch 202 disconnects the terminals B and E, and only the terminals A and...

Embodiment 2

[0041] image 3 A connection structure diagram of the load cell and the four-wire signal processing device 303 of the present invention is shown.

[0042] like image 3As shown, the connector 301 includes six terminals A~F corresponding to excitation (+), feedback (+), output (+), output (-), excitation (-) and feedback (-), and the signal processing device 303 includes The four interfaces a, c, d and f correspond to excitation (+), output (+), output (-) and excitation (-) respectively, and terminals C and D are directly connected to interfaces c and d of the signal processing device 303 respectively. An analog switch 302 is provided between terminals A and B, and between terminals E and F, respectively. When the signal processing device 303 is a four-wire system, set the analog switch 302 so that terminals A and B are short-circuited, and terminals E and F are short-circuited, and then respectively connected to interfaces a and f of the signal processing device 303 .

[0...

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Abstract

The invention provides a control circuit for a weighing sensor. The circuit comprises analog switches. Each analog switch connects a connector and a signal processing device for controlling a connection relationship between signal lines of the connector and the signal processing device. A control module controls a connection relationship between the signal lines of each connector and each signal processing device which are connected by the analog switch. The control module is controlled by the staff with buttons or menu options. The structure is simple; the cost is low; and the operation is convenient.

Description

technical field [0001] The invention relates to a weighing sensor control circuit, and mainly relates to a four-wire and six-wire control structure of the output interface of the weighing sensor. Background technique [0002] Load cells are generally divided into four-wire system and six-wire system according to the wiring method. These two wiring methods have their own advantages and disadvantages: in the four-wire connection method, such as figure 1 As shown in a, the weighing sensor has no special requirements for the instrument, and it is more convenient to use, but when the cable is long, it is easily affected by the interference caused by factors such as ambient temperature fluctuations, thereby affecting the measurement performance of the electronic weighing instrument; the six-wire system In connection, such as figure 1 As shown in b, the weighing sensor requires the instrument used with it to have a feedback input interface, such as feedback (+) and feedback (-), ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K19/0175G01G21/00G01G23/00
CPCH03K19/017509G01G21/00G01G23/00
Inventor 蒋志豪
Owner METTLER TOLEDO (CHANGZHOU) MEASUREMENT TECH CO LTD
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