Measurement circuit

Abstract

This application relates to a measurement circuit. The measurement circuit includes a sensing module matrix. The sensing module matrix includes a plurality of impedance rows and a plurality of impedance columns. The plurality of impedance rows and the plurality of impedance columns form a plurality of sensing modules through sensing units. Each of the sensing modules includes one of the first impedance units, one of the second impedance units, and one of the sensing units. The sensing unit is in a high impedance state, and there is no conduction between the plurality of impedance rows and the plurality of impedance columns. When a sensing unit is subjected to an external excitation, the impedance value of the sensing unit decreases. The impedance row and the impedance column to which the sensing unit is electrically connected are conducted. Only one impedance row and one impedance column of the measurement circuit are conducted, and the other plurality of impedance rows and the other plurality of impedance columns are not conducted. Furthermore, the measurement circuit avoids row-by-row and column-by-column scanning and improves the response speed.

Description

Technical Field

[0001] This application relates to the field of detection technology, and particularly to a measurement circuit. Background Art

[0002] A pressure sensor is a sensor that can convert a pressure signal into an electrical signal. It is widely used in various industries, including medical devices, smart wearables, water conservancy and hydropower, railway transportation, intelligent buildings, production automation, aerospace, military, petrochemical, oil wells, electricity, ships, machine tools, pipelines, and many other industries. The pressure sensor converts the pressure signal into an electrical signal through the sensitive area. Array sensing technology, as an analytical technology with high selectivity, flexible testing methods, and easy miniaturization and integration of instruments, has the advantage of identifying and detecting the surface characteristics of large-sized objects.

[0003] Array sensing technology generally scans the sensing elements in the array one by one through a step-by-step scanning method (first horizontally scanning and then vertically scanning). Even when pressure is applied only to a single point of the array sensor, the array sensor also needs to be scanned one by one, resulting in a relatively low response speed. Summary of the Invention

[0004] Based on this, it is necessary to provide a measurement circuit to address the problem that when pressure is applied only to a single point of the array sensor, the array sensor also needs to be scanned one by one, resulting in a relatively low response speed.

[0005] A measurement circuit includes a sensing module matrix. The sensing module matrix includes a first input point, a second input point, a first output point, a second output point, a plurality of impedance rows, and a plurality of impedance columns.

[0006] The plurality of impedance rows are connected in parallel between the first input point and the second input point. Each impedance row includes a plurality of first impedance units connected in series. The plurality of impedance columns are connected in parallel between the first output point and the second output point. Each impedance column includes a plurality of second impedance units connected in series. The plurality of impedance rows and the plurality of impedance columns form a plurality of sensing modules through sensing units. Each sensing module includes one first impedance unit, one second impedance unit, and one sensing unit.

[0007] Within each sensing module, one end of the sensing unit is connected to one end of the first impedance unit, and the other end of the sensing unit is connected to one end of the second impedance unit.

[0008] In the impedance row, only one sensing unit is connected between two adjacent first impedance units. In the impedance column, only one sensing unit is connected between two adjacent second impedance units.

[0009] In one embodiment, the voltages of the first input point and the second input point are the same. The voltages of the first output point and the second output point are the same.

[0010] In one embodiment, the impedance values of the first impedance unit and the second impedance unit are less than the impedance value of the sensing unit, and the impedance values of the first impedance unit and the second impedance unit differ from the impedance value of the sensing unit by at least two orders of magnitude. When the sensing unit is subjected to an external stimulus, the impedance value of the sensing unit is of the same order of magnitude as the impedance values of the first impedance unit and the second impedance unit.

[0011] In one embodiment, the impedance values of the multiple first impedance units connected in series in the same impedance row are the same and are arranged at equal intervals. The impedance values of the multiple second impedance units connected in series in the same impedance column are the same and are arranged at equal intervals.

[0012] In one embodiment, the impedance values of the multiple first impedance units included in the multiple impedance rows are the same.

[0013] In one embodiment, the impedance values of the multiple second impedance units included in the multiple impedance columns are the same.

[0014] In one embodiment, the impedance value of the first impedance unit is the same as the impedance value of the second impedance unit.

[0015] In one embodiment, the measurement circuit further includes a data acquisition module. The data acquisition module is electrically connected to the first input point, the second input point, the first output point, and the second output point, and is configured to supply power to the sensing module matrix and collect the voltage and current of the sensing module matrix.

[0016] In one embodiment, the data acquisition module includes a power supply unit. The power supply unit includes a positive electrode and a negative electrode. The first input point and the second input point are electrically connected to the positive electrode, and the first output point and the second output point are electrically connected to the negative electrode.

[0017] In one embodiment, the data acquisition module further includes: a first voltage-dividing impedance unit, a second voltage-dividing impedance unit, a third voltage-dividing impedance unit, and a fourth voltage-dividing impedance unit. The first voltage-dividing impedance unit is connected in series between the power supply unit and the first input point. The second voltage-dividing impedance unit is connected in series between the power supply unit and the second input point. The third voltage-dividing impedance unit is connected in series between the power supply unit and the first output point. The fourth voltage-dividing impedance unit is connected in series between the power supply unit and the second output point.

[0018] The impedance values of the first voltage-dividing impedance unit, the second voltage-dividing impedance unit, the third voltage-dividing impedance unit, and the fourth voltage-dividing impedance unit are all smaller than the impedance value of the sensing unit, and the impedance values of the first voltage-dividing impedance unit, the second voltage-dividing impedance unit, the third voltage-dividing impedance unit, and the fourth voltage-dividing impedance unit differ from the impedance value of the sensing unit by at least two orders of magnitude.

[0019] In one embodiment, the data acquisition module further includes a data acquisition unit. The data acquisition unit is electrically connected between the sensing module matrix and the first voltage-dividing impedance unit, the second voltage-dividing impedance unit, the third voltage-dividing impedance unit, and the fourth voltage-dividing impedance unit, and is configured to acquire the voltage and current of the sensing module matrix.

[0020] In one embodiment, the impedance values of the first voltage-dividing impedance unit and the second voltage-dividing impedance unit are the same.

[0021] In one embodiment, the impedance values of the third voltage-dividing impedance unit and the fourth voltage-dividing impedance unit are the same.

[0022] In one embodiment, the impedance values of the first voltage-dividing impedance unit, the second voltage-dividing impedance unit, the third voltage-dividing impedance unit, and the fourth voltage-dividing impedance unit are the same.

[0023] In one embodiment, the impedance values of the plurality of first impedance units are the same as those of the first voltage-dividing impedance unit and the second voltage-dividing impedance unit.

[0024] In one embodiment, the impedance values of the first impedance unit, the second impedance unit, the first voltage-dividing impedance unit, the second voltage-dividing impedance unit, the third voltage-dividing impedance unit, and the fourth voltage-dividing impedance unit are the same.

[0025] In one embodiment, the sensing unit is a varistor. Description of the Drawings

[0026] Figure 1 Schematic diagram of the measurement circuit provided in an embodiment of the present application;

[0027] Figure 2 Working schematic diagram of the measurement circuit provided in an embodiment of the present application;

[0028] Figure 3 Schematic diagram of the measurement circuit provided in another embodiment of the present application.

[0029] Reference Numerals in the Drawings:

[0030] Measurement circuit 10

[0031] The first connection point 101

[0032] The second connection point 102

[0033] The first circuit 103

[0034] The second circuit 104

[0035] The third circuit 105

[0036] The fourth circuit 106

[0037] The sensing module matrix 20

[0038] The first input point 201

[0039] The second input point 202

[0040] The first output point 203

[0041] The second output point 204

[0042] The impedance row 210

[0043] The impedance column 220

[0044] The sensing module 230

[0045] The sensing unit 231

[0046] The first impedance unit 211

[0047] The second impedance unit 221

[0048] The data acquisition module 40

[0049] The power supply unit 410

[0050] The positive electrode 411

[0051] The negative electrode 412

[0052] The first voltage dividing impedance unit 421

[0053] The second voltage dividing impedance unit 422

[0054] The third voltage dividing impedance unit 423

[0055] The fourth voltage dividing impedance unit 424

[0056] The data acquisition unit 430 Specific implementation manners

[0057] To make the above objects, features, and advantages of the present application more apparent and understandable, the following provides a detailed description of the specific embodiments of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0058] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any sequential or technical meaning. The terms "connection" and "coupling" as used in the present application, unless otherwise specifically stated, both include direct and indirect connection (coupling). In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0059] In the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over", and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath", and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature has a lower horizontal height than the second feature.

[0060] Please refer to Figure 1 , the embodiment of the present application provides a measurement circuit 10 including a sensing module matrix 20. The sensing module matrix 20 includes a first input point 201, a second input point 202, a first output point 203, a second output point 204, a plurality of impedance rows 210, and a plurality of impedance columns 220.

[0061] The plurality of impedance rows 210 are connected in parallel between the first input point 201 and the second input point 202. The impedance rows 210 include a plurality of first impedance units 211 connected in series. The plurality of impedance columns 220 are connected in parallel between the first output point 203 and the second output point 204. The impedance columns 220 include a plurality of second impedance units 221 connected in series. The plurality of impedance rows 210 and the plurality of impedance columns 220 form a plurality of sensing modules 230 through the sensing units 231. Each of the sensing modules 230 includes one of the first impedance units 211, one of the second impedance units 221, and one of the sensing units 231.

[0062] Within each of the sensing modules 230, one end of the sensing unit 231 is connected between two adjacent first impedance units 211 in the impedance row 210, and only one sensing unit 231 is connected between two adjacent first impedance units 211. The other end of the sensing unit 231 is connected between two adjacent second impedance units 221 in the impedance column 220, and only one sensing unit 231 is connected between two adjacent second impedance units 221.

[0063] The impedance value of the first impedance unit 211 and the impedance value of the second impedance unit 221 are less than the impedance value of the sensing unit 231, and the impedance value of the first impedance unit 211 and the impedance value of the second impedance unit 221 differ from the impedance value of the sensing unit 231 by at least two orders of magnitude. When subjected to an external stimulus, the impedance value of the sensing unit 231 is at the same order of magnitude as the impedance value of the first impedance unit 211 and the impedance value of the second impedance unit 221.

[0064] In the measurement circuit 10 provided in the present application, the sensing unit 231 is in a high impedance state, and there is no conduction between the plurality of impedance rows 210 and the plurality of impedance columns 220. When one of the sensing units 231 is subjected to an external stimulus, the impedance value of the sensing unit 231 decreases. The impedance row 210 and the impedance column 220 to which the sensing unit 231 is electrically connected are conducted. Only one of the impedance rows 210 and one of the impedance columns 220 in the measurement circuit 10 are conducted, and the other plurality of impedance rows 210 and the other plurality of impedance columns 220 are not conducted. Furthermore, the measurement circuit 10 avoids row-by-row and column-by-column scanning, improving the response speed. When there is no external stimulus, there is no conduction between the plurality of impedance rows 210 and the plurality of impedance columns 220, the power consumption is reduced, and the measurement circuit 10 is more energy-efficient.

[0065] The sensing module matrix 20 includes a plurality of the sensing units 231. The sensing unit 231 can receive an external stimulus and its impedance value becomes smaller. The impedance row 210 and the impedance column 220 connected to the sensing unit 231 are electrically connected to each other. The sensing module matrix 20 cooperates with a measurement circuit to measure the position of the stimulated sensing unit 231.

[0066] In the previous embodiment, the sensing module matrix 20 inputs a voltage through the first input point 201 and the second input point 202. The sensing module matrix 20 outputs a voltage through the first output point 203 and the second output point 204.

[0067] In one embodiment, the voltages of the first input point 201 and the second input point 202 are the same. The voltages of the first output point 203 and the second output point 204 are the same to ensure that the impedance row 210 and the impedance column 220 are not electrically connected to each other.

[0068] In one embodiment, the impedance values of the first impedance unit 211 and the second impedance unit 221 are both smaller than the impedance value of the sensing unit 231, and the impedance values of the first impedance unit 211 and the second impedance unit 221 differ from the impedance value of the sensing unit 231 by at least two orders of magnitude. When receiving an external stimulus, the impedance value of the sensing unit 231 and the impedance values of the first impedance unit 211 and the second impedance unit 221 are in the same order of magnitude.

[0069] The sensing unit 231 can be a circuit or a component. The form in which the sensing unit 231 receives a stimulus can be pressure, light, sound, etc. In one embodiment, the sensing unit 231 is a pressure-sensitive component, and when receiving an external stimulus, its impedance value drops sharply. The sensing unit 231 can be a varistor or a varicap. In another embodiment, the sensing unit 231 is a light-sensitive component.

[0070] In one embodiment, the sensing unit 231 is a varistor, and the first impedance unit 211 and the second impedance unit 221 are also varistors or varistor circuits. When the sensing unit 231 is a varicap, the first impedance unit 211 and the second impedance unit 221 are also varicaps or varicap circuits.

[0071] In one embodiment, the sensing units 231 are arranged in an array on a substrate material forming a sensing module matrix 20, and the distance between the sensing units 231 is a preset distance. Preferably, the sensing units 231 are equally spaced. When an external stimulus occurs, the change in the impedance value of the sensing unit 231 causes a change in the output value of the measurement circuit. Since the distance between the sensing units 231 is known, the position of the sensing unit 231 with a changed impedance can be determined according to the output value.

[0072] In one embodiment, the impedance values of multiple first impedance units 211 connected in series in the same impedance row 210 are the same and are equally spaced. The impedance values of multiple second impedance units 221 connected in series in the same impedance column 220 are the same and are equally spaced.

[0073] The impedance value of the first impedance unit 211 is proportional to the distance between the first impedance units 211, and the impedance value of the second impedance unit 221 is proportional to the distance between the second impedance units 221, which simplifies the calculation and increases the response speed.

[0074] In one embodiment, on the same impedance row 210, since multiple first impedance units 211 connected in series in the same impedance row 210 are equally spaced, the number of the first impedance units 211 connected in series is proportional to the total spanning distance of the first impedance units 211 connected in series. Also, since the impedance values of multiple first impedance units 211 connected in series in the same impedance row 210 are the same, the number of the first impedance units 211 connected in series is proportional to the total impedance value of the first impedance units 211 connected in series. Furthermore, on the same impedance column 220, the total spanning distance of the first impedance units 211 connected in series is proportional to the total impedance value of the first impedance units 211 connected in series.

[0075] In one embodiment, on the same impedance column 220, since multiple second impedance units 221 connected in series in the same impedance column 220 are equally spaced, the number of the second impedance units 221 connected in series is proportional to the total vertical spanning distance of the second impedance units 221 connected in series. Also, since the impedance values of multiple second impedance units 221 connected in series in the same impedance column 220 are the same, the number of the second impedance units 221 connected in series is proportional to the total impedance value of the second impedance units 221 connected in series. Furthermore, on the same impedance column 220, the number of the second impedance units 221 connected in series is proportional to the total impedance value of the second impedance units 221 connected in series.

[0076] In one embodiment, within each of the sensing modules 230, one end of the sensing unit 231 is connected between two adjacent first impedance units 211 in the impedance row 210, and only one sensing unit 231 is connected between two adjacent first impedance units 211. The other end of the sensing unit 231 is connected between two adjacent second impedance units 221 in the impedance column 220, and only one sensing unit 231 is connected between two adjacent second impedance units 221. When no external stimulus is received, the impedance value of the sensing unit 231 is much greater than the impedance values of the first impedance unit 211 and the second impedance unit 221, and the impedance row 210 and the impedance column 220 to which the sensing unit 231 is electrically connected are not conducting.

[0077] In one embodiment, when one of the sensing units 231 is subjected to an external stimulus, the impedance value of the sensing unit 231 rapidly decreases and decreases to the same order of magnitude as the impedance values of the first impedance unit 211 and the second impedance unit 221. At this time, the impedance row 210 and the impedance column 220 to which the sensing unit 231 is electrically connected are conducting.

[0078] Please also refer to Figure 2 , in one embodiment, the connection point of the sensing unit 231 and the impedance row 210 is the first connection point 101. The connection point of the sensing unit 231 and the impedance column 220 is the second connection point 102. A first circuit 103 is formed between the first input point 201 and the first connection point 101. A second circuit 104 is formed between the second input point 202 and the second connection point 102. The first circuit 103 and the second circuit 104 are in parallel.

[0079] In the previous embodiment, the first circuit 103 includes a plurality of the first impedance units 211 connected in series. The second circuit 104 includes a plurality of the first impedance units 211 connected in series. The sum of the number of the first impedance units 211 included in the first circuit 103 and the second circuit 104 is the number of the first impedance units 211 included in the impedance row 210.

[0080] In the previous embodiment, a third circuit 105 is formed between the first output point 203 and the second connection point 102. A fourth circuit 106 is formed between the second input-output point 202 and the second connection point 102. The third circuit 105 and the fourth circuit 106 are in parallel.

[0081] In one embodiment, the third circuit 105 includes a plurality of the second impedance units 221 connected in series. The fourth circuit 106 includes a plurality of the second impedance units 221 connected in series. The number of the second impedance units 221 included in the third circuit 105 and the fourth circuit 106 is the same as the number of the second impedance units 221 included in the impedance column 220.

[0082] In one embodiment, the impedance values of the plurality of the first impedance units 211 connected in series in the same impedance row 210 are the same and are arranged at equal intervals. Since the total cross distance of the connected first impedance units 211 is proportional to the total impedance value of the connected first impedance units 211. The length ratio of the first circuit 103 and the second circuit 104 is the impedance ratio, and the impedance ratio of the first circuit 103 and the second circuit 104 is the number ratio of the series impedance units of the first circuit 103 and the second circuit 104. Therefore, the length ratio of the first circuit 103 and the second circuit 104 is the number ratio of the series impedance units of the first circuit 103 and the second circuit 104.

[0083] In one embodiment, the impedance values of the plurality of the second impedance units 221 connected in series in the same impedance column 220 are the same and are arranged at equal intervals. Since the total longitudinal distance of the connected second impedance units 221 is proportional to the total impedance value of the connected second impedance units 221. The length ratio of the third circuit 105 and the fourth circuit 106 is the impedance ratio, and the impedance ratio of the third circuit 105 and the fourth circuit 106 is the number ratio of the series impedance units of the third circuit 105 and the fourth circuit 106. Therefore, the length ratio of the third circuit 105 and the fourth circuit 106 is the number ratio of the series impedance units of the third circuit 105 and the fourth circuit 106.

[0084] In one embodiment, the sensing module matrix 20 is arranged in a coordinate grid, and the lengths of the first circuit 103, the second circuit 104, the third circuit 105, and the fourth circuit 106 can be represented in a coordinate manner. By calculating the number of impedance units, the position of the stimulated sensing unit 231 can be determined.

[0085] As can be seen from the above, in the single stimulation state, only one sensing unit 231 in the sensing module matrix 20 is triggered. The impedance row 210 and the impedance column 220 connected to the sensing unit 231 are turned on. At this time, the circuit structure becomes: one end of the triggered sensing unit 231 is connected to the first circuit 103 and the second circuit 104 connected in parallel; the other end of the triggered sensing unit 231 is connected to the third circuit 105 and the fourth circuit 106 connected in parallel.

[0086] In one embodiment, the impedance ratio between the first circuit 103 and the second circuit 104 is the ratio of the length from one end of the sensing unit 231 to the first input point 301 to the length from one end of the sensing unit 231 to the second input point 302. The impedance ratio between the third circuit 105 and the fourth circuit 106 is the ratio of the length from the other end of the sensing unit 231 to the first output point 303 to the length from one end of the sensing unit 231 to the second output point 304. The measurement circuit 10 accurately locates the position of the stimulated sensing unit 231.

[0087] In one embodiment, when not receiving external stimulation, the sensing unit 231 is in a high-impedance state, and there is no conduction between the plurality of impedance rows 210 and the plurality of impedance columns 220. When one of the sensing units 231 is externally stimulated, only one impedance row 210 and one impedance column 220 are conducted. The measurement circuit 10 does not need to scan row by row and column by column for accurate positioning, which improves the response speed. At the same time, the measurement circuit 10 saves energy consumption.

[0088] In one embodiment, the impedance values of the plurality of first impedance units 211 included in the plurality of impedance rows 210 are the same. The impedance ratio accuracies of different impedance rows 210 are the same, and the measurement accuracies of the measurement circuit 10 in the horizontal direction are the same. Furthermore, the measurement accuracy of the measurement circuit 10 is improved.

[0089] In one embodiment, the impedance values of the plurality of second impedance units 221 included in the plurality of impedance columns 220 are the same. The impedance ratio accuracies of different impedance columns 220 are the same, and the measurement accuracies of the measurement circuit 10 in the vertical direction are the same. Furthermore, the measurement accuracy of the measurement circuit 10 is improved.

[0090] In one embodiment, the impedance value of the first impedance unit 211 is the same as the impedance value of the second impedance unit 221. The impedance ratios of different impedance rows 210 and different impedance columns 220 are the same. Furthermore, the measurement accuracy of the measurement circuit 10 is improved.

[0091] Please also refer to FIG. 3. In one embodiment, the measurement circuit 10 further includes:

[0092] A data acquisition module 40, electrically connected to the first input point 201, the second input point 202, the first output point 203, and the second output point 204, for supplying power to the sensing unit array 20 and collecting the voltage and current of the sensing module matrix 20.

[0093] The data acquisition module 40 supplies power to the sensing module matrix 20 through the first input point 201, the second input point 202, the first output point 203, and the second output point 204, and acquires the voltage and current of the sensing module matrix 20. The impedance value of the sensing module matrix 20 is obtained from the voltage and the current, and through data analysis and processing, the position of the stimulated sensing unit 231 is obtained, which is simple to operate, improves the response speed, and saves resources.

[0094] In one embodiment, the data acquisition module 40 includes:

[0095] A power supply unit 410, the power supply unit 410 includes a positive electrode 411 and a negative electrode 412, the first input point 201 and the second input point 202 are electrically connected to the positive electrode 411, and the first output point 203 and the second output point 204 are electrically connected to the negative electrode 412.

[0096] The power supply unit 410 is used to supply power to the sensing module matrix 20 to make it in a standby state.

[0097] In one embodiment, the data acquisition module 40 further includes:

[0098] A first voltage-dividing impedance unit 421, connected in series between the power supply unit 410 and the first input point 201.

[0099] A second voltage-dividing impedance unit 422, connected in series between the power supply unit 410 and the second input point 202.

[0100] A third voltage-dividing impedance unit 423, connected in series between the power supply unit 410 and the first output point 203.

[0101] A fourth voltage-dividing impedance unit 424, connected in series between the power supply unit 410 and the second output point 204.

[0102] The impedance values of the first voltage-dividing impedance unit 421, the second voltage-dividing impedance unit 422, the third voltage-dividing impedance unit 423, and the fourth voltage-dividing impedance unit 424 are all smaller than the impedance value of the sensing unit 231, and the impedance values of the first voltage-dividing impedance unit 421, the second voltage-dividing impedance unit 422, the third voltage-dividing impedance unit 423, and the fourth voltage-dividing impedance unit 424 differ from the impedance value of the sensing unit 231 by at least two orders of magnitude.

[0103] The first voltage-dividing impedance unit 421, the second voltage-dividing impedance unit 422, the third voltage-dividing impedance unit 423, and the fourth voltage-dividing impedance unit 424 protect the sensing module matrix 20 to prevent the current from being too large and causing breakdown when the sensing module matrix 20 is turned on instantaneously.

[0104] When the impedance values of the first voltage-dividing impedance unit 421, the second voltage-dividing impedance unit 422, the third voltage-dividing impedance unit 423, and the fourth voltage-dividing impedance unit 424 are close to the impedance value of the sensing unit 231, the plurality of impedance rows 210 and the plurality of impedance columns 220 are respectively connected, and the impedance value is small. The voltage division of each voltage-dividing impedance unit is larger than that of the sensing module matrix 20, that is, the current is very small. Even if the impedance value of an individual in the sensing module matrix 20 changes, the current fluctuation is small, and the measurement sensitivity of the measurement circuit 10 is not high.

[0105] Therefore, the impedance values of the first voltage-dividing impedance unit 421, the second voltage-dividing impedance unit 422, the third voltage-dividing impedance unit 423, and the fourth voltage-dividing impedance unit 424 are all smaller than the impedance value of the sensing unit 231, and the impedance values of the first voltage-dividing impedance unit 421, the second voltage-dividing impedance unit 422, the third voltage-dividing impedance unit 423, and the fourth voltage-dividing impedance unit 424 differ from the impedance value of the sensing unit 231 by at least two orders of magnitude, improving the sensitivity of the measurement circuit 10.

[0106] In one embodiment, the data acquisition module 40 further includes:

[0107] A data acquisition unit 430, electrically connected between the sensing module matrix 20 and the first voltage-dividing impedance unit 421, the second voltage-dividing impedance unit 422, the third voltage-dividing impedance unit 423, and the fourth voltage-dividing impedance unit 424, for acquiring the voltage and current of the sensing module matrix 20.

[0108] The data acquisition unit 430 can acquire the voltages of the first input point 201, the second input point 202, the first output point 203, and the second output point 204. At the same time, the data acquisition unit 430 can acquire the currents of the first circuit 103, the second circuit 104, the third circuit 105, and the fourth circuit 106.

[0109] Since the voltages of the first input point 201 and the second input point 202 are the same, the impedance ratio of the first circuit 103 to the second circuit 104 is the inverse ratio of the currents of the first circuit 103 to the second circuit 104. Also, since the impedance ratio of the first circuit 103 to the second circuit 104 is the length ratio of the first circuit 103 to the second circuit 104, the length ratio of the first circuit 103 to the second circuit 104 is the inverse ratio of the currents of the first circuit 103 to the second circuit 104, which is simple to calculate and saves resources.

[0110] Since the voltages of the first output point 203 and the second output point 204 are the same, the impedance ratio of the third circuit 105 to the fourth circuit 106 is the inverse ratio of the currents of the third circuit 105 to the fourth circuit 106. Also, since the impedance ratio of the third circuit 105 to the fourth circuit 106 is the length ratio of the third circuit 105 to the fourth circuit 106, the length ratio of the third circuit 105 to the fourth circuit 106 is the inverse ratio of the currents of the third circuit 105 to the fourth circuit 106, which is simple to calculate and saves resources.

[0111] In one embodiment, the impedance values of the first voltage-dividing impedance unit 421 and the second voltage-dividing impedance unit 422 are the same, simplifying the impedance calculation of the first circuit 103 and the second circuit 104.

[0112] When the impedance values of the first voltage-dividing impedance unit 421 and the second voltage-dividing impedance unit 422 are different, the impedance value of the first voltage-dividing impedance unit 421 needs to be converted into the value of the first impedance unit 211 and deducted from the total impedance of the first circuit 103. At the same time, the impedance value of the second voltage-dividing impedance unit 422 is converted into the value of the first impedance unit 211 and deducted from the total impedance of the second circuit 104. Therefore, when the impedance values of the first voltage-dividing impedance unit 421 and the second voltage-dividing impedance unit 422 are the same, there is no need to convert the impedance value of the second voltage-dividing impedance unit 422 into the value of the first impedance unit 211, simplifying the calculation steps and saving energy.

[0113] In one embodiment, the impedance values of the third voltage-dividing impedance unit 423 and the fourth voltage-dividing impedance unit 424 are the same, simplifying the impedance calculation of the third circuit 105 and the fourth circuit 106.

[0114] When the impedance values of the third voltage-dividing impedance unit 423 and the fourth voltage-dividing impedance unit 424 are different, it is necessary to convert the impedance value of the third voltage-dividing impedance unit 423 into the value of the second impedance unit 221 and deduct it from the total impedance of the third circuit 105. At the same time, convert the impedance value of the fourth voltage-dividing impedance unit 424 into the value of the second impedance unit 221 and deduct it from the total impedance of the fourth circuit 106. Therefore, when the impedance values of the third voltage-dividing impedance unit 423 and the fourth voltage-dividing impedance unit 424 are the same, there is no need to convert the impedance value of the fourth voltage-dividing impedance unit 424 into the value of the second impedance unit 221, which simplifies the calculation steps and saves energy.

[0115] In one embodiment, the impedance values of the first voltage-dividing impedance unit 421, the second voltage-dividing impedance unit 422, the third voltage-dividing impedance unit 423, and the fourth voltage-dividing impedance unit 424 are the same. Only the resistance value of any one voltage-dividing impedance unit needs to be converted, reducing the calculation steps and accelerating the response speed.

[0116] In one embodiment, the impedance values of the plurality of first impedance units 211 are the same as those of the first voltage-dividing impedance unit 421 and the second voltage-dividing impedance unit 422.

[0117] In one embodiment, the impedance values of the plurality of second impedance units 221 are the same as those of the third voltage-dividing impedance unit 423 and the third voltage-dividing impedance unit 423.

[0118] In one embodiment, the impedance values of the plurality of first impedance units 211, the plurality of second impedance units 221, the first voltage-dividing impedance unit 421, the second voltage-dividing impedance unit 422, the third voltage-dividing impedance unit 423, and the fourth voltage-dividing impedance unit 424 are the same.

[0119] In one embodiment, the impedance value of the sensing unit 231 is denoted as Rp. The impedance value of the first impedance unit 211 is denoted as r. The impedance value of the second impedance unit 221 is denoted as k. i represents the impedance row 210. j represents the impedance column 220. Rpij represents the impedance value of the sensing unit 231 in the i-th impedance row and the j-th impedance column 220. rij represents the impedance value of the first impedance unit 211 in the i-th impedance row and the j-th impedance column 220. kij represents the impedance value of the second impedance unit 221 in the i-th impedance row and the j-th impedance column 220. The impedance row 210 has a total of m rows. The impedance column 220 has a total of n columns.

[0120] The impedance value of the first voltage-dividing impedance unit 421 is denoted as K1. The impedance value of the second voltage-dividing impedance unit 422 is denoted as K2. The impedance value of the third voltage-dividing impedance unit 423 is denoted as K3. And the impedance value of the fourth voltage-dividing impedance unit 424 is denoted as K4.

[0121] The current value of the first circuit 103 is denoted as I-x1, the current value of the second circuit 104 is denoted as I-x2, the current value of the third circuit 105 is denoted as I-y1, and the current value of the second circuit 104 is denoted as I-y2. The total resistance value of the first circuit 103 is Rx1, the total resistance value of the second circuit 104 is Rx2, the total resistance value of the third circuit 105 is Ry1, and the total resistance value of the fourth circuit 106 is Ry2. Rx1 / Rx2 is equal to I-x2 / I-x1, and Ry1 / Ry2 is equal to I-y2 / I-y1.

[0122] When the sensing unit 231Rp22 receives an external stimulus, the first circuit 103 includes r21 and K1 connected in series. The second circuit 104 includes r23 to r2(n + 1) and K2 connected in series. The third circuit 105 includes k12 and K3 connected in series. The fourth circuit 106 includes k23 to k(m + 1)3 and K4 connected in series.

[0123] The impedance values of the multiple first impedance units 211, the multiple second impedance units 221, the first voltage-dividing impedance unit 421, the second voltage-dividing impedance unit 422, the third voltage-dividing impedance unit 423, and the fourth voltage-dividing impedance unit 424 are the same. The impedance values of the multiple first impedance units 211 connected in series in the same impedance row 210 are the same and are arranged at equal intervals. The impedance values of the multiple second impedance units 221 connected in series in the same impedance column 220 are the same and are arranged at equal intervals. The length ratio of the first circuit 103 to the second circuit 104 is the ratio of the number of series impedance units of the first circuit 103 to the second circuit 104. The length ratio of the third circuit 105 to the fourth circuit 106 is the ratio of the number of series impedance units of the third circuit 105 to the fourth circuit 106.

[0124] As can be seen from the above, the length ratio of the first circuit 103 to the second circuit 104 is (r21 + K1) / [r23 + …… + r2(n + 1)+K2]. The length ratio of the third circuit 105 to the fourth circuit 106 is (k12 + K3) / [k23 + …… + k(m + 1)3+K4]. Thus, the position of the sensing unit 231Rp22 can be obtained.

[0125] Measure the voltage U1 between the first voltage-dividing impedance unit 421 or the second voltage-dividing impedance unit 422 and the sensing module matrix 20. Since the impedance values of the first impedance unit 211 and the second impedance unit 221 are less than the impedance value of the sensing unit 231, and the impedance values of the first impedance unit 211 and the second impedance unit 221 differ from the impedance value of the sensing unit 231 by at least two orders of magnitude. Therefore, the impedance value of the parallel connection of the first circuit 103 and the second circuit 104 is less than the impedance value of the stimulated sensing unit 231 and differs by at least two orders of magnitude. Therefore, the impedance values of the first circuit 103, the second circuit 104, the third circuit 105, and the fourth circuit 106 can be ignored. The impedance value of the stimulated sensing unit 231 is U1 / [(I - x1)+(I - x2)]. Also, since the impedance value of the sensing unit 231 is related to the magnitude of the received stimulation signal, the magnitude of the stimulation signal received by the sensing unit 231 can be determined.

[0126] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0127] The above-described embodiments merely represent several implementation manners of the present application, but should not be construed as limiting the scope of the patent of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A measurement circuit, characterized in that, including: a sensing module matrix (20), including: a first input point (201), a second input point (202), a first output point (203) and a second output point (204); a plurality of impedance rows (210), the plurality of impedance rows (210) being connected in parallel between the first input point (201) and the second input point (202), and the impedance row (210) including a plurality of first impedance units (211) connected in series; a plurality of impedance columns (220), the plurality of impedance columns (220) being connected in parallel between the first output point (203) and the second output point (204), and the impedance column (220) including a plurality of second impedance units (221) connected in series; the plurality of impedance rows (210) and the plurality of impedance columns (220) form a plurality of sensing modules (230) through sensing units (231), and each sensing module (230) includes one of the first impedance units (211), one of the second impedance units (221) and one sensing unit (231); within each sensing module (230), one end of the sensing unit (231) is connected to one end of the first impedance unit (211), and the other end of the sensing unit (231) is connected to one end of the second impedance unit (221); in the impedance row (210), only one sensing unit (231) is connected between two adjacent first impedance units (211), and in the impedance column (220), only one sensing unit (231) is connected between two adjacent second impedance units (221); the voltages of the first input point (201) and the second input point (202) are the same, and the voltages of the first output point (203) and the second output point (204) are the same; the impedance value of the first impedance unit (211) and the impedance value of the second impedance unit (221) are less than the impedance value of the sensing unit (231), and the impedance value of the first impedance unit (211) and the impedance value of the second impedance unit (221) differ from the impedance value of the sensing unit (231) by at least two orders of magnitude. When the sensing unit (231) is subjected to an external stimulus, the impedance value of the sensing unit (231) is in the same order of magnitude as the impedance value of the first impedance unit (211) and the second impedance unit (221).

2. The measurement circuit according to claim 1, characterized in that, the impedance values of the plurality of first impedance units (211) connected in series in the same impedance row (210) are the same and are arranged at equal intervals; the impedance values of the plurality of second impedance units (221) connected in series in the same impedance column (220) are the same and are arranged at equal intervals.

3. The measurement circuit according to claim 1, wherein the impedance values of the plurality of first impedance units (211) included in the plurality of impedance rows (210) are the same.

4. The measuring circuit according to claim 1, characterized in that, the impedance values of the plurality of second impedance units (221) included in the plurality of impedance columns (220) are the same.

5. The measurement circuit according to claim 1, characterized in that, the impedance value of the first impedance unit (211) is the same as the impedance value of the second impedance unit (221).

6. The measurement circuit according to claim 1, wherein further comprising: The data acquisition module (40) is electrically connected to the first input point (201), the second input point (202), the first output point (203) and the second output point (204), and is used to supply power to the sensing module matrix (20) and collect the voltage and current of the sensing module matrix (20).

7. The measuring circuit according to claim 6, wherein The data acquisition module (40) includes: A power supply unit (410), the power supply unit (410) includes a positive electrode (411) and a negative electrode (412), the first input point (201) and the second input point (202) are electrically connected to the positive electrode (411), and the first output point (203) and the second output point (204) are electrically connected to the negative electrode (412).

8. The measurement circuit according to claim 7, characterized in that, The data acquisition module (40) further includes: A first voltage-dividing impedance unit (421), connected in series between the power supply unit (410) and the first input point (201); A second voltage-dividing impedance unit (422), connected in series between the power supply unit (410) and the second input point (202); A third voltage-dividing impedance unit (423), connected in series between the power supply unit (410) and the first output point (203); A fourth voltage-dividing impedance unit (424), connected in series between the power supply unit (410) and the second output point (204); The impedance values of the first voltage-dividing impedance unit (421), the second voltage-dividing impedance unit (422), the third voltage-dividing impedance unit (423) and the fourth voltage-dividing impedance unit (424) are all smaller than the impedance value of the sensing unit (231), and the impedance values of the first voltage-dividing impedance unit (421), the second voltage-dividing impedance unit (422), the third voltage-dividing impedance unit (423) and the fourth voltage-dividing impedance unit (424) differ from the impedance value of the sensing unit (231) by at least two orders of magnitude.

9. The measuring circuit according to claim 8, characterized in that, The data acquisition module (40) further includes: A data acquisition unit (430), electrically connected between the sensing module matrix (20) and the first voltage-dividing impedance unit (421), the second voltage-dividing impedance unit (422), the third voltage-dividing impedance unit (423) and the fourth voltage-dividing impedance unit (424), and is used to collect the voltage and current of the sensing module matrix (20).

10. The measurement circuit according to claim 9, characterized in that, The impedance values of the first voltage-dividing impedance unit (421) and the second voltage-dividing impedance unit (422) are the same.

11. The measuring circuit according to claim 9, characterized in that, The impedance values of the third voltage-dividing impedance unit (423) and the fourth voltage-dividing impedance unit (424) are the same.

12. The measurement circuit according to claim 9, characterized in that, The impedance values of the first voltage-dividing impedance unit (421), the second voltage-dividing impedance unit (422), the third voltage-dividing impedance unit (423) and the fourth voltage-dividing impedance unit (424) are the same.

13. The measurement circuit according to claim 9, characterized in that, The impedance values of the plurality of first impedance units (211) are the same as those of the first voltage-dividing impedance unit (421) and the second voltage-dividing impedance unit (422).

14. The measuring circuit according to claim 9, characterized in that The impedance values of the first impedance unit (211), the second impedance unit (221), the first voltage-dividing impedance unit (421), the second voltage-dividing impedance unit (422), the third voltage-dividing impedance unit (423), and the fourth voltage-dividing impedance unit (424) are the same.

15. The measurement circuit according to claim 1, characterized in that, The sensing unit (231) is a varistor.

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