CN111537117A - Miniature piezoresistive sensor array measuring circuit based on voltage division method and measuring method thereof - Google Patents
Miniature piezoresistive sensor array measuring circuit based on voltage division method and measuring method thereof Download PDFInfo
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- CN111537117A CN111537117A CN202010506916.XA CN202010506916A CN111537117A CN 111537117 A CN111537117 A CN 111537117A CN 202010506916 A CN202010506916 A CN 202010506916A CN 111537117 A CN111537117 A CN 111537117A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/02—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning
- G01L9/06—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning of piezo-resistive devices
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Abstract
The invention discloses a micro piezoresistive sensor array measuring circuit based on a voltage division method and a measuring method thereof, wherein the micro piezoresistive sensor array measuring circuit comprises an MCU with an ADC arranged inside and a micro piezoresistive sensor array voltage division circuit; the miniature piezoresistive sensor array voltage-dividing circuit consists of a miniature piezoresistive sensor array and voltage-dividing resistors, wherein the miniature piezoresistive sensor array consists of n miniature piezoresistive sensors, one ends of the n miniature piezoresistive sensors are correspondingly connected with the general IO ports of the MCU one by one, the other ends of the miniature piezoresistive sensors are connected with one ADC (analog to digital converter) interface of the MCU on one hand and one end of the voltage-dividing resistors on the other hand, the other end of the voltage-dividing resistors is grounded, and each miniature piezoresistive sensor and the voltage-dividing resistors form a resistor voltage-dividing branch circuit; the general IO port of MCU gates a resistance voltage division branch and shields other resistance voltage division branches according to its three-state characteristic, and MCU's built-in ADC gathers divider resistance both ends voltage value through the ADC interface, and measuring circuit is small, the precision is high.
Description
Technical Field
The invention belongs to the technical field of piezoresistive sensor array measurement, and relates to a miniature piezoresistive sensor array measurement circuit based on a voltage division method and a measurement method thereof.
Background
The micro piezoresistive sensor array is widely applied due to low manufacturing cost and simple structure, the micro piezoresistive sensor is widely applied to the fields of robots, medical treatment, health monitoring and the like, such as the touch perception of the robots, the human body stress perception in medical health monitoring equipment and the like, and due to limited space, the micro piezoresistive sensor array also has the requirement of miniaturization on a measuring circuit of the sensor, so that the measuring circuit of the micro piezoresistive sensor is necessarily subjected to miniaturization treatment. The piezoresistive sensor is used for converting pressure change into resistance change, so that the pressure applied to the sensor can be calculated by measuring the resistance of the piezoresistive sensor, and therefore research on a resistance measuring circuit of a micro piezoresistive sensor array is also receiving wide attention. The traditional multi-path resistance measuring circuit is mainly divided into a constant current method, a voltage division method, a bridge method, a time constant method and the like. For example, utility model patent publication No. CN208477016U discloses a multi-channel resistance measuring circuit based on the constant current method, the measuring accuracy of which highly depends on the stability and accuracy of the constant current source, and the circuit volume is increased by using DAC and MOS transistor of the constant current source as the constant current source. As the invention patent with publication number CN103954840A uses a bridge method to measure resistance, but the measurement range is small, and the requirement of piezoresistive sensors for resistance measurement with large-range variation cannot be met; the time constant method resistance measuring circuit usually introduces the influence of capacitance, and is not suitable for the application occasions such as dexterous robot hands and the like which are easy to be interfered by the outside. The voltage division method resistance measurement circuit has relatively low measurement precision, but has simple circuit structure and small volume, and is suitable for multi-path resistance measurement.
In summary, the voltage-dividing method resistance measurement circuit can satisfy the conditions of the measurement range and the measurement precision of the piezoresistive sensor array, and the volume of the circuit is the minimum. However, on the one hand, the conventional voltage-dividing type multi-path resistance measuring circuit usually includes a power supply module, an MCU module, a multiplexer module, a micro piezoresistive sensor array module, a sampling circuit module, and the like, because the number of modules is large, and the size of the multiplexer module is large, the miniaturization of the measuring circuit is restricted, and meanwhile, more measurement errors are introduced due to the existence of the multiplexer module, and the circuit design cost is increased, for example, the invention patent with publication number CN104122005A uses a multi-path analog switch for multi-path selection, and because the multi-path analog switch itself has resistance, the final resistance measurement error is inevitably increased. On the other hand, the existing voltage-dividing type multi-path resistance measuring circuit usually adopts a two-dimensional resistance network sharing row lines and column lines to measure the micro piezoresistive sensors, and the mutual interference between the micro piezoresistive sensors can be generated in principle by the measuring method, and in order to solve the problem, an inverting amplifier needs to be added on each shared row line in the resistance network to isolate the interference between the micro piezoresistive sensors, for example, the method is used in the chinese patent with publication number CN106597110A, but when the inverting amplifier is adopted to isolate the interference between the micro piezoresistive sensors, the complexity of the measuring circuit is increased, and meanwhile, the measurement error is introduced due to the non-ideal characteristic of the operational amplifier.
Disclosure of Invention
The embodiment of the invention aims to provide a miniature piezoresistive sensor array measuring circuit based on a voltage division method, and the miniature piezoresistive sensor array measuring circuit is used for solving the problems that the existing voltage division type multi-path resistance measuring circuit is large in size, low in measuring precision and not suitable for measurement of a miniature piezoresistive sensor.
Another objective of the embodiments of the present invention is to provide a measuring method of a micro piezoresistive sensor array measuring circuit based on a voltage division method.
The technical scheme adopted by the embodiment of the invention is that the micro piezoresistive sensor array measuring circuit based on the voltage division method comprises an MCU with an ADC (analog to digital converter) arranged inside and a micro piezoresistive sensor array voltage division circuit; miniature piezoresistive sensor array divides piezo-resistor circuit to constitute by miniature piezoresistive sensor array and divider resistance, wherein, miniature piezoresistive sensor array comprises n miniature piezoresistive sensors, n miniature piezoresistive sensor one end is connected with MCU's general IO mouth one-to-one, its other end on the one hand with an ADC interface connection of MCU, on the other hand is connected with divider resistance one end, the divider resistance other end ground connection, and every miniature piezoresistive sensor all forms a resistance partial pressure branch road with divider resistance.
The embodiment of the invention adopts another technical scheme that the measuring method of the miniature piezoresistive sensor array measuring circuit based on the voltage division method is carried out according to the following steps:
step S1, replacing the micro piezoresistive sensors with precision standard resistors with different resistance values to access a resistor voltage dividing branch, adopting the tri-state characteristic of the general IO port of the MCU to gate the resistor voltage dividing branch where one precision standard resistor is located and shield other resistor voltage dividing branches, and measuring the voltage values at two ends of the voltage dividing resistor to obtain the corresponding functional relation between the resistance value of the precision standard resistor and the voltages at two ends of the voltage dividing resistor;
and step S2, polling and gating each resistance voltage dividing branch and shielding other resistance voltage dividing branches according to a set polling period by adopting the tri-state characteristic of the universal IO port of the MCU, simultaneously collecting the voltage values at two ends of the voltage dividing resistance according to a set sampling period by adopting the built-in ADC of the MCU, and then obtaining the resistance value of the miniature piezoresistive sensor of the currently gated resistance voltage dividing branch by utilizing the corresponding function relationship between the resistance value of the precise standard resistance and the voltage at two ends of the voltage dividing resistance.
The embodiment of the invention has the advantages that the invention provides the miniature piezoresistive sensor array measuring circuit based on the voltage division method and the measuring method thereof, which have simple structure and extremely small volume, the tristate characteristic of the general IO port of the MCU is used for realizing the excitation and the gating of each resistance voltage division branch, thereby replacing a multiplexer module in the traditional measuring circuit, greatly reducing the volume of the multichannel resistance measuring circuit, simultaneously measuring each miniature piezoresistive sensor independently, reducing the complexity of the measuring circuit, avoiding the crosstalk among the miniature piezoresistive sensors, eliminating the nonideal characteristic of operational amplification and the measuring error introduced by the multiplexer module, ensuring the resistance measuring precision while reducing the circuit volume, realizing the measuring and communication functions of 12 channels of miniature piezoresistive sensors on a PCB with the diameter of 13mm multiplied by 12mm, and ensuring the measuring precision to be +/-0.12% +0.7, the resolution ratio is 1 omega, the problems that the existing voltage division type multi-path resistance measuring circuit is large in size, low in measuring precision and not suitable for measurement of a miniature piezoresistive sensor are solved, and cascade expansion can be carried out.
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 description of the embodiments or 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 schematic circuit diagram of a miniature multi-path resistance measuring circuit based on a voltage division method according to an embodiment of the present invention.
FIG. 2 is a connection diagram of a miniature multi-path resistance measurement circuit based on a voltage division method according to an embodiment of the present invention.
In the figure, 1, MCU, 2, general IO port, 3, micro piezoresistive sensor array voltage division circuit, 4, ADC interface, 5, power circuit, 6, micro piezoresistive sensor, 7, voltage division resistor, 8, power chip, and 9, resistor voltage division branch.
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.
The embodiment of the invention provides a miniature multi-path resistance measuring circuit based on a voltage division method, which comprises an MCU1, a miniature piezoresistive sensor array voltage division circuit 3 and a power circuit 5, wherein the output end of the power circuit 5 is connected with a power pin of an MCU1, and the MCU1 is connected with the miniature piezoresistive sensor array voltage division circuit 3 through a universal IO port 2 and an ADC interface 4. Miniature piezoresistive sensor array bleeder circuit 3 includes n miniature piezoresistive sensors 6 and 1 divider resistance 7, MCU1 embeds the ADC and contains n at least general IO mouth 2 and 1 at least ADC interface 4, n miniature piezoresistive sensor 6 one end is connected with MCU 1's n general IO mouth 2 one-to-one, n miniature piezoresistive sensor 6 other end is connected with 1 ADC interface 4 of MCU1 on the one hand, on the other hand is connected with divider resistance 7 one end, divider resistance 7 other end ground connection, and every miniature piezoresistive sensor 6 forms a resistance divider branch road 9 with divider resistance 7, n miniature piezoresistive sensor 6 forms n resistance divider branch road 9 with divider resistance 7, be used for measuring n miniature piezoresistive sensor 6's resistance value.
The ADC interface 4 of the MCU1 is its own ADC interface or can be reused as an IO port of the ADC interface, that is, when the MCU1 has its own ADC interface, it is connected to the micro piezoresistive sensor 6 by using its own ADC interface, and when the MCU1 does not have its own ADC interface, it is connected to the micro piezoresistive sensor 6 by using its own IO port which can be reused as the ADC interface. The power supply circuit 5 adopts a power supply chip 8, and the output voltage of the power supply chip 8 is the same as the working voltage of the power supply pin of the MCU 1.
As shown IN fig. 2, IN the embodiment of the present invention, the power chip 8 is a TPS79133 power chip, an IN pin of the TPS79133 power chip is connected to an EN pin through a capacitor C1, a BYPASS pin thereof is grounded through a capacitor C2, and a GND pin thereof is directly grounded; the OUT pin of the TPS79133 power supply chip is connected with the VCC pin of the MCU1 on one hand, and is grounded through a capacitor C3 on the other hand.
When the general IO port 2 of the MCU1 is set to a high impedance state, almost no current will flow through the micro piezoresistive sensor 6 connected to the general IO port 2, and when the general IO port 2 of the MCU1 is set to a high output, the micro piezoresistive sensor 6 connected to the general IO port 2 is excited, and current flows through. When resistance measurement is carried out, the tri-state characteristic of the general IO port 2 of the MCU1 is adopted to gate one resistance voltage division branch 9 and shield other resistance voltage division branches 9, the gated resistance voltage division branch 9 is excited by the voltage provided by the corresponding general IO port 2, and then the built-in ADC of the MCU1 is used for collecting the voltage values at two ends of the voltage division resistor 7 according to a set sampling period.
In the embodiment of the invention, taking the resistance measurement range of 100-:
step S1, replacing the micro piezoresistive sensor 6 with the precision standard resistor with different resistance values to access the resistor voltage dividing branch 9, calibrating the micro multi-path resistor measuring circuit based on the voltage dividing method, and obtaining the corresponding functional relation between the resistance value of the precision standard resistor and the voltage values at two ends of the voltage dividing resistor 7: in the embodiment, the resistance measurement range of the circuit is 100-2000 Ω, a precision standard resistor (100 Ω, 200 Ω, 500 Ω, 1000 Ω, 1500 Ω, 2000 Ω) is used to replace a micro piezoresistive sensor 6 and is connected to a resistor voltage dividing branch 9, a MCU1, namely the tri-state characteristic of a general IO port 2 of an MSP430I2041 single chip microcomputer, is used to gate and connect one resistor voltage dividing branch 9 of the precision standard resistor in sequence, the general IO port 2 of the MSP430I2041 single chip microcomputer connected with the gated resistor voltage dividing branch 9 is set to high level output to provide voltage excitation for the gated resistor voltage dividing branch 9, meanwhile, the general IO port 2 of the MSP430I2041 single chip microcomputer connected with the rest resistor voltage dividing branch 9 is set to high resistance state, and the voltage values at two ends of the divider resistor 7 are collected by using a built-in ADC of the MCU1, and the corresponding function relationship between the resistance value of the precision standard resistor and the voltage values at two ends of the divider resistor 7 can be directly obtained because the precision resistor used, in this embodiment, the resistance of the voltage dividing resistor 7 is 200 Ω.
Step S2, polling and gating each resistance voltage dividing branch 9 and shielding other resistance voltage dividing branches 9 according to a set polling period by using the tri-state characteristic of the general IO port 2 of the MCU1, simultaneously collecting the voltage values at the two ends of the voltage dividing resistor 7 according to a set sampling period by using a built-in ADC, and then obtaining the resistance value of the micro piezoresistive sensor 6 of the currently gated resistance voltage dividing branch 9 by using the corresponding functional relationship between the resistance value of the precise standard resistor and the voltages at the two ends of the voltage dividing resistor 7:
sequentially using the tri-state characteristics of 1 general IO port 2 of the MSP430I2041 singlechip to gate the 1-path resistance voltage-dividing branch 9 correspondingly connected with the same, providing voltage excitation for the gated resistance voltage-dividing branch 9, and simultaneously setting the general IO ports 2 of the other connected resistance voltage-dividing branches 9 of the MSP430I2041 singlechip to be in a high impedance state; and then, acquiring voltage values at two ends of the divider resistor 7 by using a built-in ADC of the MSP430I2041 singlechip, calculating the resistance value of the micro piezoresistive sensor 6 in the gated resistor divider branch 9 according to a corresponding function relation between the resistance value of the micro piezoresistive sensor 6 calibrated by using a precise standard resistor and the voltage at two ends of the divider resistor 7, and polling each resistor divider branch 9 according to a set polling period to acquire the resistance value of the micro piezoresistive sensor 6 in each resistor divider branch 9.
In the conventional multi-path resistance measurement, the preferred measurement method is resistance measurement by a constant current method, but the principle of resistance measurement by the constant current method is not applicable in the application scene with harsh requirements on the circuit volume because the volume of the constant current source is overlarge. The volume of a measuring circuit for measuring the resistance by the voltage division method is smaller than that by the constant current method, but the measuring circuit has the same problem because the conventional measuring circuit for measuring the multi-path resistance by the voltage division method uses an analog switch to realize the switching among the multi-path miniature piezoresistive sensors, and the reduction of the volume of the measuring circuit is also limited by the existence of the analog switch. Therefore, the application innovatively provides that the general IO port 2 tri-state characteristic of the MCU1 is used to replace an analog switch, and the innovation further reduces the size of the measuring circuit and the complexity of the measuring circuit while ensuring the measuring precision.
The embodiment of the invention uses 1 power circuit 5 and MCU1 to realize multi-path resistance measurement, omits common parts such as a multi-channel switch, an excitation circuit and the like in the multi-path resistance measurement of the current voltage division method, simultaneously measures each micro piezoresistive sensor 6 independently, avoids crosstalk between the micro piezoresistive sensors 6 and non-ideal errors caused by operational amplification in principle, and further reduces the circuit area of a multi-path measurement system on the premise of ensuring the precision. The miniature multi-path resistance measuring circuit based on the voltage division method can realize 12-path resistance measurement and communication functions on a PCB with the thickness of 13mm multiplied by 12mm, the measuring range of the measuring circuit is 100-2000 omega, the measuring precision is +/-0.12% +0.7, the resolution is 1 omega, and cascade expansion can be carried out. The problems of large volume and low measurement precision of a multi-path resistance measurement circuit are solved, the multi-path resistance measurement circuit can be used in a multi-path resistance measurement scene with strict requirements on the circuit volume, reliable resistance real-time measurement data can be provided for a flexible piezoresistive touch sensing array, and the multi-path resistance measurement circuit has important significance for expanding the touch sensing application of dexterous robots.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (9)
1. The micro piezoresistive sensor array measuring circuit based on the voltage division method is characterized by comprising an MCU (1) with a built-in ADC and a micro piezoresistive sensor array voltage division circuit (3); miniature piezoresistive sensor array bleeder circuit (3) comprises miniature piezoresistive sensor array and divider resistance (7), wherein, miniature piezoresistive sensor array comprises a miniature piezoresistive sensor (6) of n, a general IO mouth (2) one-to-one of a miniature piezoresistive sensor (6) of n and MCU (1) is connected, its other end is connected with ADC interface (4) of MCU (1) on the one hand, on the other hand is connected with divider resistance (7) one end, divider resistance (7) other end ground connection, and every miniature piezoresistive sensor (6) all forms a resistance divider branch (9) with divider resistance (7).
2. The micro piezoresistive sensor array measuring circuit based on voltage division method according to claim 1, wherein the MCU (1) is a single chip microcomputer comprising at least n general IO ports (2) and at least one ADC interface (4), and the general IO port (2) of the MCU (1) gates or shields the resistive voltage division branch (9) connected to it correspondingly according to its three-state characteristics.
3. The micro piezoresistive sensor array measuring circuit based on the voltage division method according to claim 2, wherein the ADC interface (4) is a single chip microcomputer and can be reused as an IO port of the ADC interface, and a built-in ADC of the MCU (1) collects voltage values at two ends of the voltage division resistor (7) through the ADC interface (4).
4. The partial pressure based micro piezoresistive sensor array measurement circuit according to any of the claims 1-3, wherein the power supply pin of the MCU (1) is connected to the power supply circuit (5).
5. The partial pressure based micro piezoresistive sensor array measuring circuit according to claim 4, characterised in that the power supply circuit (5) uses a power supply chip (8), and the output voltage of the power supply chip (8) is the same as the working voltage of the power supply pin of the MCU (1).
6. The minute piezoresistive sensor array measuring circuit based on voltage division method according to claim 5, wherein the power chip (8) is a TPS79133 power chip, the IN pin of the TPS79133 power chip is connected with the EN pin through a capacitor C1, the BYPASS pin of the TPS chip is grounded through a capacitor C2, the GND pin of the TPS chip is directly grounded, the OUT pin of the TPS chip is connected with the power pin of the MCU (1) on one hand, and the OUT pin of the TPS chip is grounded through a capacitor C3 on the other hand.
7. The piezoresistive micro-sensor array measuring circuit according to any of claims 1-3, 5 or 6, wherein the divider resistor (7) is a precision resistor with a fixed resistance.
8. The method for measuring the micro piezoresistive sensor array measuring circuit based on the voltage division method according to any one of the claims 1 to 3, 5 or 6, is characterized by comprising the following steps:
s1, replacing the micro piezoresistive sensors (6) with precision standard resistors with different resistance values to be connected into one resistor voltage dividing branch (9), gating the resistor voltage dividing branch (9) where one precision standard resistor is located by adopting the tri-state characteristic of the general IO port (2) of the MCU (1) and shielding the other resistor voltage dividing branches (9), measuring the voltage values at two ends of the voltage dividing resistor (7), and obtaining the corresponding functional relation between the resistance value of the precision standard resistor and the voltage at two ends of the voltage dividing resistor (7);
and S2, polling and gating each resistance voltage dividing branch (9) and shielding other resistance voltage dividing branches (9) according to a set polling period by adopting the tri-state characteristic of the general IO port (2) of the MCU (1), simultaneously collecting the voltage values at two ends of the voltage dividing resistor (7) according to a set sampling period by adopting the built-in ADC of the MCU (1), and then obtaining the resistance value of the miniature piezoresistive sensor (6) of the currently gated resistance voltage dividing branch (9) by utilizing the corresponding function relationship between the resistance value of the precise standard resistor and the voltage at two ends of the voltage dividing resistor (7).
9. The method for measuring a minute piezoresistive sensor array measuring circuit according to claim 8, wherein the step S1 is implemented as follows: precise standard resistors with the resistance values of 100 omega, 200 omega, 500 omega, 1000 omega, 1500 omega and 2000 omega are adopted to replace the micro piezoresistive sensor (6) to be connected with a resistor voltage-dividing branch (9), then the tri-state characteristics of the general IO port (2) of the MCU (1) are used for gating the resistance voltage dividing branch (9) connected with the precision standard resistance respectively, namely, the general IO port (2) connected with the resistance voltage division branch (9) connected with the precision standard resistance is set as high level output to provide voltage excitation for the gated resistance voltage division branch (9), meanwhile, the general IO port (2) connected with the rest resistance voltage division branch (9) is set to be in a high resistance state, and a built-in ADC of the MCU (1) is used for collecting voltage values at two ends of the divider resistor (7), the corresponding function relation between the resistance value of the precision standard resistor and the voltage values at the two ends of the divider resistor (7) can be obtained.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112858786A (en) * | 2020-12-31 | 2021-05-28 | 广州鲁邦通物联网科技有限公司 | Modular resistance voltage measuring device and method |
| CN114878033A (en) * | 2022-03-29 | 2022-08-09 | 深圳国微感知技术有限公司 | Matrix type pressure distribution measuring system and method |
| CN115267340A (en) * | 2022-07-29 | 2022-11-01 | 北京津发科技股份有限公司 | Detection circuit and device based on equipotential shielding |
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2020
- 2020-06-05 CN CN202010506916.XA patent/CN111537117A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112858786A (en) * | 2020-12-31 | 2021-05-28 | 广州鲁邦通物联网科技有限公司 | Modular resistance voltage measuring device and method |
| CN114878033A (en) * | 2022-03-29 | 2022-08-09 | 深圳国微感知技术有限公司 | Matrix type pressure distribution measuring system and method |
| CN114878033B (en) * | 2022-03-29 | 2023-12-22 | 深圳国微感知技术有限公司 | Matrix type pressure distribution measurement system and method |
| CN115267340A (en) * | 2022-07-29 | 2022-11-01 | 北京津发科技股份有限公司 | Detection circuit and device based on equipotential shielding |
| CN115267340B (en) * | 2022-07-29 | 2023-06-16 | 北京津发科技股份有限公司 | Detection circuit and device based on equipotential shielding |
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