CN216558991U

CN216558991U - Multi-sensor measuring circuit

Info

Publication number: CN216558991U
Application number: CN202122356110.XU
Authority: CN
Inventors: 倪志权; 周黄果; 蔡官荣
Original assignee: Shenzhen Ai Si Pu Core Technology Co ltd
Current assignee: Shenzhen Ai Si Pu Core Technology Co ltd
Priority date: 2021-09-27
Filing date: 2021-09-27
Publication date: 2022-05-17
Anticipated expiration: 2031-09-27

Abstract

The utility model provides a multi-sensor measuring circuit which comprises a main control module, a matrix switch, a relay array, a DMM digital multimeter, a plurality of sensors and a power module, wherein the power module is used for supplying power by direct current, the sensors are connected with the input end of the matrix switch, the output end of the matrix switch is connected with the input end of the relay array, the output end of the relay array is connected with the DMM digital multimeter, and the control ends of the matrix switch, the relay array and the DMM digital multimeter are electrically connected with the main control module. According to the utility model, the plurality of sensors are connected to the DMM digital multimeter for measurement by adopting the matrix switch and the relay array, the sensor calibration measurement efficiency is greatly improved, and the calibration data is convenient to collect and store.

Description

Multi-sensor measuring circuit

Technical Field

The utility model relates to the technical field of sensor measurement, in particular to a multi-sensor measuring circuit.

Background

A bridge circuit, also called a bridge circuit, is a type of circuit in which a branch is inserted into an intermediate node of each of two parallel branches to bridge the two parallel branches. Initially, bridge circuits were used as precision metrology in laboratories, where a component near the midpoint of a parallel branch was parametrically adjustable in use. Bridge circuits are widely used in various linear and nonlinear circuits, including instruments, electronic filters, and electric energy conversion.

The instrument usually comprises two parts, namely a front-end sensor and a signal measurement main board. Bridge circuits are commonly used as sensors for converting a physical quantity (e.g., temperature, pressure, etc.) to an electrical signal. In practical application, the working temperature range of the temperature or pressure sensor is wide, so that a temperature measuring resistor is arranged in the high-precision sensor and used for measuring the working temperature of the sensor, the sensor needs to be calibrated before leaving a factory, the calibration time of the sensor is long, the workload is large, and the efficiency is low. To improve sensor calibration efficiency, it is desirable to calibrate more sensors at a time, rather than just one sensor.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem of low calibration efficiency of the sensor, the utility model discloses a multi-sensor measuring circuit which comprises a main control module, a matrix switch, a relay array, a DMM digital multimeter, a plurality of sensors and a power supply module, wherein the power supply module is used for supplying power for direct current, the sensors are connected with the input end of the matrix switch, the output end of the matrix switch is connected with the input end of the relay array, the output end of the relay array is connected with the DMM digital multimeter, and the control ends of the matrix switch, the relay array and the DMM digital multimeter are electrically connected with the main control module.

Furthermore, the DMM digital multimeter comprises a voltage measuring circuit unit, a resistance measuring circuit unit, a conversion circuit unit and a display unit, wherein the conversion circuit unit is connected with the voltage measuring circuit unit and the resistance measuring circuit unit and used for voltage measurement/resistance measurement switching, the display unit is used for voltage measurement and resistance measurement value display, and the DMM digital multimeter transmits acquired data to the main control module through the digital interface for processing.

Furthermore, the R1+ end of the sensor is connected with the

pins

142 and 140 of the matrix switch, the R1-end of the sensor is connected with the R2+ end and then is connected with the

pins

141 and 161 of the matrix switch, the R2-end of the sensor is connected with the pin 159 of the matrix switch, the R3+ end of the sensor is connected with the pin 160 of the matrix switch, the R3-end of the sensor is connected with the R4+ end and then is connected with the

pins

40 and 139 of the matrix switch, the R4-end of the sensor is connected with the

pins

39 and 162 of the matrix switch, and the Rt + end and the Rt-end of the sensor are respectively connected with the

pins

61 and 62 of the matrix switch; output terminals C5-C16 of the matrix switch are respectively connected with input terminals A5-A16 of the relay array, output terminals C6, C9 and C11 of the relay array are all connected with a pin 1 of the DMM digital multimeter, output terminals C6, C8, C10 and C12 of the relay array are all connected with a pin 2 of the DMM digital multimeter, ends C13 and C14 of the relay array are connected with a positive electrode end of a direct current power supply, and ends C15 and C16 of the relay array are connected with a negative electrode end of the direct current power supply.

Further, the sensor is a temperature sensor, or a pressure sensor.

Further, the matrix switch model is 40-675-402-10/16.

Furthermore, the model number of the relay array is 40-11-021.

The multi-sensor measuring circuit provided by the utility model has the following beneficial technical effects:

the utility model adopts the matrix switch and the relay array to connect the sensors into the DMM digital multimeter for measurement, can calibrate the sensors, greatly improves the sensor calibration and measurement efficiency, and facilitates the collection, storage and analysis of calibration data.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a functional block diagram of an embodiment of a multi-sensor measurement circuit of the present invention;

FIG. 2 is a schematic diagram of a portion of a multi-sensor measurement circuit according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a sensor configuration in an embodiment of a multi-sensor measurement circuit of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, 2 to 3, an embodiment of the present invention provides a multi-sensor measurement circuit, which includes a main control module 10, a matrix switch 20, a relay array 30, a DMM digital multimeter 40, a plurality of sensors 50 and a power module 60, where the power module 60 is configured to provide 5V dc voltage for power supply, the sensors 50 are connected to an input end of the matrix switch 20, an output end of the matrix switch 20 is connected to an input end of the relay array 30, an output end of the relay array 30 is connected to the DMM digital multimeter 40, control ends of the matrix switch 20, the relay array 30 and the DMM digital multimeter 40 are all electrically connected to the main control module 10, and the main control module 10 includes an MCU processor and a memory chip.

The DMM digital multimeter 40 includes a voltage measurement circuit unit 401, a resistance measurement circuit unit 402, a conversion circuit unit 403 and a display unit 404, the conversion circuit unit 403 is connected with the voltage measurement circuit unit 401 and the resistance measurement circuit unit 402 for voltage measurement/resistance measurement switching, the display unit 404 is used for voltage measurement and resistance measurement value display, and the DMM digital multimeter 40 transmits acquired data to the main control module 10 through a digital interface for processing.

The R1+ end of the sensor 50 is connected with the

pins

142 and 140 of the matrix switch 20, the R1-end of the sensor 50 is connected with the R2+ end and then is connected with the

pins

141 and 161 of the matrix switch 20, the R2-end of the sensor 50 is connected with the pin 159 of the matrix switch 20, the R3+ end of the sensor 50 is connected with the pin 160 of the matrix switch 20, the R3-end of the sensor 50 is connected with the R4+ end and then is connected with the

pins

40 and 139 of the matrix switch 20, the R4-end of the sensor 50 is connected with the

pins

39 and 162 of the matrix switch 20, and the Rt + end and the Rt-end of the sensor 50 are respectively connected with the

pins

61 and 62 of the matrix switch 20; output terminals C5-C16 of the matrix switch 20 are respectively connected with input terminals a 5-a 16 of the relay array 30, output terminals C6, C9 and C11 of the relay array 30 are all connected with a pin 1 of the DMM digital multimeter 40, output terminals C6, C8, C10 and C12 of the relay array 30 are all connected with a pin 2 of the DMM digital multimeter 40, terminals C13 and C14 of the relay array 30 are connected with a positive terminal of a direct current power supply 60, and terminals C15 and C16 of the relay array 30 are connected with a negative terminal of the direct current power supply 60.

The sensor 50 is a temperature sensor, or a pressure sensor.

The matrix switch 20 is of the type 40-675-402-10/16.

The relay array 30 is 40-11-021 in type.

Further explanation is as follows: referring to fig. 3, 10 sensors can be calibrated in the multi-Sensor measurement circuit of the present invention, wherein the Sensor (Sensor) comprises: a bridge arm formed by R1 and R3 is connected in series with a bridge arm formed by R2 and R4 to form a branch, a bridge arm formed by R5 and R7 is connected in series with a bridge arm formed by R6 and R8 to form another branch, and R10 and R9 form a temperature measuring resistor of the sensor.

The working principle of the utility model is as follows: for a Sensor (Sensor) calibration, two operating states need to be measured: and the differential output voltage of the ammeter is measured when the sensor is powered on, and the resistance values of the 4 bridge arms are measured when the sensor is powered off.

1. Sensor differential voltage measurement: setting a voltage level (the conversion circuit unit is switched to be output by the voltage measurement circuit unit) by the DMM digital multimeter, and switching off all relays of a relay array (the model is 40-11-021) and switching on A6-C6 and A9-C9; the matrix switch (model number 40-675-402-10/16) selects 3.x (Multiplexer1D), wherein Vol-/Vol + of the DMM digital multimeter is connected with Sensor _ vg + and Sensor _ vg-, then the relay array (40-11-021) is switched on to supply power to the sensors from A13-C13, A14-C14, A15-C15 and A16-C16, and differential voltage of the sensors is acquired through the DMM digital multimeter.

2. The Sensor was measured for 4 bridge arm resistances (Sensor _ R1/Sensor _ R2/Sensor _ R3/Sensor _ R4) and temperature sensing resistors (Sensor _ Rt): setting a bit resistance gear (the conversion circuit unit is switched to be output by the resistance measurement circuit unit) of the DMM digital multimeter; measuring the Sensor _ R1, disconnecting all relays of the relay array (40-11-021), then connecting A5-C5 and A6-C6, wherein Res +/Res-of the DMM digital multimeter is connected with the Sensor _ R1+ and the Sensor _ R1-, and reading the resistance value of the Sensor _ R1 by the DMM digital multimeter; measuring Sensor _ R2, disconnecting all relays of a relay array (40-11-021) and then connecting A6-C6 and A7-C7, wherein Res-/Res + of the DMM digital multimeter is connected with Sensor _ R2+ and Sensor _ R2-, and the DMM digital multimeter reads the resistance value of the Sensor _ R2; measuring Sensor _ R3, disconnecting all relays of a relay array (40-115-; measuring Sensor _ R4, disconnecting all relays of a relay array (40-11-021) and then connecting A9-C9 and A10-C10, wherein Res +/Res-of the DMM digital multimeter is connected with Sensor _ R4+ and Sensor _ R4-, and reading the resistance value of the Sensor _ R4 by the DMM digital multimeter; measuring the Sensor _ Rt, disconnecting all relays of the relay array (40-11-021) and then connecting A11-C11 and A12-C12, wherein Res +/Res-of the DMM digital multimeter is connected with the Sensor _ Rt + and the Sensor _ Rt-, and reading the resistance value of the Sensor _ Rt by the DMM digital multimeter.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The utility model provides a multisensor measurement circuit, its characterized in that includes host system, matrix switch, relay array, DMM digital multimeter, a plurality of sensor and power module, power module is used for DC supply, the input of matrix switch is connected to the sensor, the output of matrix switch is connected the input of relay array, the output of relay array is connected DMM digital multimeter, the control end of matrix switch, relay array and DMM digital multimeter all with host system electric connection.

2. The multi-sensor measuring circuit according to claim 1, wherein the DMM digital multimeter comprises a voltage measuring circuit unit, a resistance measuring circuit unit, a conversion circuit unit and a display unit, the conversion circuit unit is connected with the voltage measuring circuit unit and the resistance measuring circuit unit and used for switching between voltage measurement and resistance measurement, the display unit is used for displaying voltage measurement and resistance measurement values, and the DMM digital multimeter transmits acquired data to the main control module through a digital interface for processing.

3. The multi-sensor measurement circuit according to claim 1, wherein the R1+ terminal of the sensor is connected to pins 142 and 140 of the matrix switch, the R1-terminal of the sensor is connected to the R2+ terminal and then is connected to pins 141 and 161 of the matrix switch, the R2-terminal of the sensor is connected to pin 159 of the matrix switch, the R3+ terminal of the sensor is connected to pin 160 of the matrix switch, the R3-terminal of the sensor is connected to pins 40 and 139 of the matrix switch after being connected to the R4+ terminal, the R4-terminal of the sensor is connected to pins 39 and 162 of the matrix switch, and the Rt + terminal and Rt-terminal of the sensor are connected to pins 61 and 62 of the matrix switch respectively; output terminals C5-C16 of the matrix switch are respectively connected with input terminals A5-A16 of the relay array, output terminals C6, C9 and C11 of the relay array are all connected with a pin 1 of the DMM digital multimeter, output terminals C6, C8, C10 and C12 of the relay array are all connected with a pin 2 of the DMM digital multimeter, ends C13 and C14 of the relay array are connected with a positive electrode end of a direct current power supply, and ends C15 and C16 of the relay array are connected with a negative electrode end of the direct current power supply.

4. The multi-sensor measurement circuit of claim 1, wherein the sensor is a temperature sensor or a pressure sensor.

5. The multi-sensor measurement circuit of claim 1, wherein the matrix switch model is 40-675-402-10/16.

6. The multi-sensor measurement circuit of claim 1, wherein the relay array model number is 40-11-021.