CN218546841U - Intelligent measuring device - Google Patents
Intelligent measuring device Download PDFInfo
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- CN218546841U CN218546841U CN202222198222.1U CN202222198222U CN218546841U CN 218546841 U CN218546841 U CN 218546841U CN 202222198222 U CN202222198222 U CN 202222198222U CN 218546841 U CN218546841 U CN 218546841U
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Abstract
The utility model belongs to the technical field of instrument and meter, especially, relate to an intelligent measuring device, include: a controller; the input end protection module comprises a detection signal voltage sampling circuit, a voltage measuring circuit, a resistance capacitance measuring circuit and an adjusting circuit, and the other ends of the detection signal voltage sampling circuit, the voltage measuring circuit, the resistance capacitance measuring circuit and the adjusting circuit are respectively connected with the controller; the adjusting circuit comprises a first protection unit, a first solid-state relay, a second solid-state relay and a thermistor, one end of the first protection unit is connected with the controller, one end of the thermistor is connected with the sampling port, and one ends of the first solid-state relay and the second solid-state relay are connected with the controller. The measuring device provided by the application can automatically detect the type of the device to be measured, and switches to the corresponding mode to measure the device to be measured, thereby effectively ensuring the accuracy of device identification and effectively preventing safety events caused by error measurement.
Description
Technical Field
The application relates to the field of instruments and meters, in particular to an intelligent measuring device.
Background
In the related technology, the automatic measurement function of the multimeter can only realize automatic identification and measurement in a voltage range, a resistance range and a switching range. However, in the actual use process, the following problems exist: for a frequently used capacitor gear and a frequently used diode gear, a user needs to manually rotate or perform key operation to switch to a corresponding gear for measurement, so that the measurement is very inconvenient to use, is very unfriendly to users who are unfamiliar with electrical characteristics, is difficult to ensure the measurement accuracy, and is seriously easy to cause the safety problem.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
SUMMERY OF THE UTILITY MODEL
In view of at least one of the above technical problems, the present application provides an intelligent measuring device, which solves the problems that a user is required to manually rotate or perform key operation to switch to a corresponding gear for measurement aiming at a frequently used capacitance gear and a diode gear, the use is very inconvenient, the user who is not familiar with electrical characteristics is very unfriendly, and the measurement accuracy is difficult to ensure.
An embodiment of a first aspect of the present application provides an intelligent measurement apparatus, including:
a controller; and
the input end protection module comprises a detection signal voltage sampling circuit, a voltage measuring circuit, a resistance-capacitance measuring circuit and an adjusting circuit, wherein one end of the detection signal voltage sampling circuit, one end of the voltage measuring circuit, one end of the resistance-capacitance measuring circuit and the other end of the adjusting circuit are connected with the sampling port together;
the regulating circuit comprises a first protection unit, a first solid-state relay SW1, a second solid-state relay SW2 and a thermistor PTC1 which are sequentially connected, one end of the first protection unit is connected with the controller, one end of the thermistor PTC1 is connected with the sampling port, and one ends of the first solid-state relay SW1 and the second solid-state relay SW2D are connected with the controller.
The embodiment of the application has the following technical effects: the measuring device provided by the application can automatically detect the type of the device to be measured, and switches to the corresponding mode to measure the device to be measured, thereby effectively ensuring the accuracy of device identification, improving the measurement accuracy rate, and effectively preventing the safety event caused by error measurement.
In one implementation manner, the first protection unit includes a transistor Q1 and a transistor Q2, an emitter of the transistor Q2 is connected to the controller through a resistor R11, a base of the transistor Q2 is connected to a base of the transistor Q1, a collector and a base of the transistor Q1 are connected to a collector of the transistor Q2, and an emitter of the transistor Q1 is grounded.
In one implementation, a capacitor C2 and a capacitor C1 are sequentially connected between the resistance-capacitance measuring circuit and the adjusting circuit.
In one implementation manner, a first end of the first solid-state relay SW1 and a first end of the second solid-state relay SW2 are commonly connected and grounded, a second end of the first solid-state relay SW1 and a second end of the second solid-state relay SW2 are commonly connected and connected with the controller, a third end of the first solid-state relay SW1 is connected with the controller, a fourth end of the first solid-state relay SW1 is connected with a third end of the second solid-state relay SW2, and a fourth end of the second solid-state relay SW2 is connected with the thermistor PTC1.
In one implementation, the first end of the first solid state relay SW1 is grounded through a resistor R10, and the first end of the second solid state relay SW2 is grounded through a resistor R9.
In one implementation, the detection signal voltage sampling circuit includes a resistor R1 and a resistor R2 connected in sequence, the resistor R1 is connected to the sampling port, and the resistor R2 is connected to the controller.
In one implementation manner, the voltage measurement circuit includes a resistor R3, a resistor R4, a resistor R5, and a resistor R6, which are connected in sequence, the resistor R3 is connected to the sampling port, the resistor R6 is connected to the controller, a resistor R7 is connected between the resistor R3 and the sampling port, and the other end of the resistor R7 is connected to the resistor R6.
The present invention will be further explained with reference to the drawings and the embodiments.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a block diagram of a measuring device provided in an embodiment of the present application;
FIG. 2 is a circuit diagram of a measurement device provided by an embodiment of the present application;
FIG. 3 is a schematic diagram of measuring resistance in a fixed measurement mode according to an embodiment of the present disclosure;
FIG. 4 is a side view of a resistance measurement in an auto-scan mode as provided by an embodiment of the present application;
fig. 5 is a schematic diagram illustrating charging of a capacitor to be measured according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram of discharging a capacitor to be measured according to an embodiment of the present application;
FIG. 7 is a first connection diagram of a diode under test according to an embodiment of the present application;
FIG. 8 is a diagram illustrating a second connection of a diode under test according to an embodiment of the present application;
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present application.
In the description of the present application, it is to be understood that the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the embodiments of the present application, unless otherwise specifically stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.
As shown in fig. 1 to 2, an embodiment of a first aspect of the present application provides an intelligent measurement apparatus, including:
a controller 300; and
the input end protection module 100 comprises a detection signal voltage sampling circuit 110, a voltage measuring circuit 120, a resistance capacitance measuring circuit 130 and an adjusting circuit 140, one end of which is commonly connected with the sampling port 200, and the other ends of the detection signal voltage sampling circuit 110, the voltage measuring circuit 120, the resistance capacitance measuring circuit 130 and the adjusting circuit 140 are respectively connected with the controller 300;
the adjusting circuit 140 includes a first protection unit 141, a first solid-state relay SW1, a second solid-state relay SW2 and a thermistor PTC1, which are connected in sequence, one end of the first protection unit 141 is connected to the controller 300, one end of the thermistor PTC1 is connected to the sampling port 200, and one ends of the first solid-state relay SW1 and the second solid-state relay SW2D are connected to the controller 300.
The controller 300 has an analog-to-digital converter therein. In addition, the controller 300 is further connected with a reminding module and a display module. The reminding module can be a buzzer or a backlight unit arranged on the outer surface of the device. The display module is an LCD or LED display unit and is used for displaying the measurement value of the device to be measured.
The A1 port of the detection signal voltage sampling circuit 110, the A2 port of the voltage measurement circuit 120, the A3 port of the resistance-capacitance measurement circuit 130, and the A4 port and the A5 port of the adjustment circuit 140 are respectively connected to ports on the controller 300, and signals from the A1 port to the A5 port need to enter an analog-to-digital converter in the controller 300 for processing.
In this embodiment, the measurement apparatus has a fixed measurement mode and an auto-scan measurement mode. The fixed measurement mode is switched by a key, and at this time, the controller 300 selects the corresponding circuit configuration, calculates the data result according to the device to be measured, and displays the measurement value. In the auto-scan measurement mode, the controller 300 scans at a fixed frequency and in a sequence, matches corresponding input signals or devices to configure a circuit, and transmits sampling data to an analog-to-digital converter in the controller 300 for processing.
Specifically, the detection voltage threshold is set in the controller 300, and is in a range of 0.6V to 2.8V. In the automatic scanning measurement mode, the A1 port of the detection signal voltage sampling circuit 110 transmits the acquired voltage values with different changes to the controller 300 for determining the type of the device to be measured. When the voltage value collected by the A1 port of the detection signal voltage sampling circuit 110 is higher than the threshold value, the controller 300 determines that the measurement end is the detection voltage, and the controller 300 sends an instruction to close the first solid-state relay and the second solid-state relay in time, so as to ensure that the A4 port of the regulating circuit 140 is disconnected, thereby protecting the controller 300 and other devices.
Further, in the auto-scan measurement mode, the controller 300 outputs a constant voltage VDD through the A4 port of the regulating circuit 140. When the sampling port 200 is higher than the voltage of 0.6V, the controller 300 switches the function to the voltage measurement mode, and simultaneously sends out an instruction through the A5 port of the regulating circuit 140 to turn off the first solid-state relay SW1 and the second solid-state relay SW 2; when high voltage (greater than 100V) is met, under the transient voltage impact, on one hand, the thermistor PTC1, the first solid-state relay SW1 and the second solid-state relay SW2 quickly form a protection branch, the first protection unit 141 quickly enters a soft breakdown state to form a transient high-current loop, so that the thermistor PTC1 generates heat along with the increase of current, the resistance value is quickly increased, the increase of the current of the whole branch is limited, the high voltage and the high current impact on the two solid-state relays is avoided, and the loop protection work in a safe region state is ensured. On the other hand, when the A1 port of the detection signal voltage sampling circuit 110 detects that the input voltage is greater than 0.6V, the controller 300 issues an instruction to switch the first solid-state relay SW1 and the second solid-state relay SW2 from the closed state to the open state.
The measuring device provided by the application can automatically detect the type of the device to be measured, and switches to the corresponding mode to measure the device to be measured, thereby effectively ensuring the accuracy of device identification, improving the measurement accuracy rate, and effectively preventing the safety event caused by error measurement.
As shown in fig. 1 to 2, the first protection unit 141 includes a transistor Q1 and a transistor Q2, an emitter of the transistor Q2 is connected to the controller 300 through a resistor R11, a base of the transistor Q2 is connected to a base of the transistor Q1, a collector and a base of the transistor Q1 are connected to a collector of the transistor Q2, and an emitter of the transistor Q1 is grounded.
A capacitor C2 and a capacitor C1 are sequentially connected between the resistance-capacitance measuring circuit 130 and the adjusting circuit 140.
The first end of the first solid-state relay SW1 and the first end of the second solid-state relay SW2 are connected together and grounded, the second end of the first solid-state relay SW1 and the second end of the second solid-state relay SW2 are connected together and communicated with the controller 300, the third end of the first solid-state relay SW1 is connected with the controller 300, the fourth end of the first solid-state relay SW1 is connected with the third end of the second solid-state relay SW2, and the fourth end of the second solid-state relay SW2 is connected with the thermistor PTC1.
The first end of the first solid-state relay SW1 is grounded through a resistor R10, and the first end of the second solid-state relay SW2 is grounded through a resistor R9. The resistance of the resistor R10 is 2k Ω. The resistance of the resistor R9 is 2k Ω.
In this embodiment, the thermistor PTC1, the first solid state relay SW1, the second solid state relay SW2, the triode Q1 and the triode Q2 form a protection branch together, the triode Q1 and the triode Q2 rapidly enter a soft breakdown state to form an instantaneous high-current loop, so that the thermistor PTC1 generates heat along with the increase of current, and the resistance value is rapidly increased, thereby limiting the increase of the current of the whole branch, avoiding the impact of high voltage and high current on the two solid state relays, and ensuring that the loop protection works in a safe region state.
As shown in fig. 1 to 2, the detection signal voltage sampling circuit 110 includes a resistor R1 and a resistor R2 connected in sequence, the resistor R1 is connected to the sampling port 200, and the resistor R2 is connected to the controller 300. The resistance of the resistor R1 is 10M Ω. The resistance of the resistor R2 is 10M Ω. The resistor R1 and the resistor R2 function to protect the controller 300 and prevent the voltage value of the sampling port 200 from being too large and damaging the controller 300.
As shown in fig. 1 to 2, the voltage measurement circuit 120 includes a resistor R3, a resistor R4, a resistor R5, and a resistor R6, which are connected in sequence, the resistor R3 is connected to the sampling port 200, the resistor R6 is connected to the controller 300, a resistor R7 is connected between the resistor R3 and the sampling port 200, and the other end of the resistor R7 is connected to the resistor R6. The resistances of the resistor R3, the resistor R4, the resistor R5, the resistor R6 and the resistor R7 are all 2.5M omega. These resistors function to protect the controller 300.
As shown in fig. 3, fig. 3 shows the resistance measurement in the fixed measurement mode. The resistance value of the resistor to be tested is determined by the voltage division between the resistor to be tested and the thermistor PTC1. In this mode, the VDD terminal provides a constant voltage output, and the voltage value is 0.5V, at this time, the amplitude of the input voltage at the A3 port of the rc measuring circuit 130 is below 0.5V. At this time, the first solid-state relay SW1 and the second solid-state relay SW2 are in a closed state, and thus can be regarded as wires.
As shown in fig. 4, fig. 4 shows the measurement of the resistance in the auto-scan mode. In this mode, the controller 300 monitors whether the voltage of the thermistor PTC1 is between 0.6V and 2.8V through the A4 port of the regulating circuit 140, and according to the potential change of the resistor to be measured, the change amount thereof is sampled by the resistor R8 and inputted through the A3 port of the rc measuring circuit 130, and the controller 300 will enter into automatic resistance measurement.
As shown in fig. 5, fig. 5 is a schematic diagram of charging a capacitor to be measured; the VDD end charges the capacitor to be tested through the thermistor PTC1, and the charging principle formula is as follows:
in the formula, V 0 Is the initial voltage, V, on the capacitor u To a full charge termination voltage, V (t) Is a voltage at any time. R is a thermistor PTC1. The meaning of the formula is that the capacitor to be measured with the initial value of 0 is charged through the resistor PTC1.
As shown in fig. 6, fig. 6 is a schematic diagram of discharging the capacitor to be measured; wherein, the principle formula of discharging is:
in the formula, V t At any moment, the voltage value E is the initial value of two ends of the capacitor, and R is the thermistor PTC1. The meaning of the formula is that the capacitor to be measured discharges through the resistor PTC1.
The above two formulas can judge that the voltage of the capacitor to be measured changes exponentially with time no matter the capacitor to be measured is charged or discharged, so that the device is determined according to the voltage at any time in the process of distinguishing. In practical application, V (t) Cannot be equal to V 0 Has a V (t) ＞V 0 (V herein) (t) = VDD). E is greater than V during discharge t (here E = VDD). From these two indices, it can be determined that the device measured at this time is a capacitance.
As shown in fig. 7, fig. 7 is a first connection diagram of the diode to be measured, under the condition of the above-mentioned scanning range of 0.6V to 2.8V, the voltage of the thermistor PTC1 is limited to the conducting voltage value of the diode to be measured, at this time, the voltage of the A3 port of the rc measuring circuit 130 is lower than the VDD terminal and within a certain range, and when the voltage of the diode to be measured drops to more than 0.6V, it can be determined whether the measuring device is a diode according to the voltage value here.
As shown in fig. 8, fig. 8 is a second connection diagram of the diode to be tested, since the diode to be tested is reversely connected, the diode to be tested is not conducted, and at this time, the voltage at the A3 port of the resistance-capacitance measuring circuit 130 is close to the voltage at the VDD terminal, so that it can be determined that the device to be tested is a diode but is in a non-conducting state. The controller 300 determines the diode to be tested according to the positive and negative access results, which is beneficial to the operation of users who are not familiar with the properties of the diode.
The foregoing is merely a preferred embodiment of the present application and is not intended to limit the present application in any way. Those skilled in the art can now make numerous possible variations and modifications to the disclosed embodiments, or modify equivalent embodiments, using the methods and techniques disclosed above, without departing from the scope of the claimed embodiments. Therefore, all equivalent changes made according to the shape, structure and principle of the present application without departing from the content of the technical scheme of the present application should be covered in the protection scope of the present application.
Claims (7)
1. An intelligent measuring device, comprising:
a controller; and
the input end protection module comprises a detection signal voltage sampling circuit, a voltage measuring circuit, a resistance capacitance measuring circuit and an adjusting circuit, wherein one end of the detection signal voltage sampling circuit, one end of the voltage measuring circuit, one end of the resistance capacitance measuring circuit and the other end of the adjusting circuit are connected with the sampling port, and the other ends of the detection signal voltage sampling circuit, the voltage measuring circuit, the resistance capacitance measuring circuit and the adjusting circuit are respectively connected with the controller;
the adjusting circuit comprises a first protection unit, a first solid-state relay SW1, a second solid-state relay SW2 and a thermistor PTC1 which are sequentially connected, one end of the first protection unit is connected with the controller, one end of the thermistor PTC1 is connected with the sampling port, and one ends of the first solid-state relay SW1 and the second solid-state relay SW2 are connected with the controller.
2. The intelligent measuring device according to claim 1, wherein the first protection unit comprises a transistor Q1 and a transistor Q2, an emitter of the transistor Q2 is connected to the controller through a resistor R11, a base of the transistor Q2 is connected to a base of the transistor Q1, a collector and a base of the transistor Q1 are connected to a collector of the transistor Q2, and an emitter of the transistor Q1 is grounded.
3. The intelligent measuring device according to claim 1, wherein a capacitor C2 and a capacitor C1 are connected in sequence between the resistance-capacitance measuring circuit and the adjusting circuit.
4. The intelligent measuring device according to claim 1, wherein a first end of the first solid-state relay SW1 and a first end of the second solid-state relay SW2 are commonly connected and grounded, a second end of the first solid-state relay SW1 and a second end of the second solid-state relay SW2 are commonly connected and connected with the controller, a third end of the first solid-state relay SW1 is connected with the controller, a fourth end of the first solid-state relay SW1 is connected with a third end of the second solid-state relay SW2, and a fourth end of the second solid-state relay SW2 is connected with the thermistor PTC1.
5. The intelligent measurement device according to claim 4, wherein the first end of the first solid state relay SW1 is connected to ground through a resistor R10 and the first end of the second solid state relay SW2 is connected to ground through a resistor R9.
6. The intelligent measuring device according to claim 1, wherein the detection signal voltage sampling circuit comprises a resistor R1 and a resistor R2 connected in sequence, the resistor R1 is connected to the sampling port, and the resistor R2 is connected to the controller.
7. The intelligent measuring device according to claim 1, wherein the voltage measuring circuit comprises a resistor R3, a resistor R4, a resistor R5 and a resistor R6 connected in sequence, the resistor R3 is connected to the sampling port, the resistor R6 is connected to the controller, a resistor R7 is connected between the resistor R3 and the sampling port, and the other end of the resistor R7 is connected to the resistor R6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222198222.1U CN218546841U (en) | 2022-08-19 | 2022-08-19 | Intelligent measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222198222.1U CN218546841U (en) | 2022-08-19 | 2022-08-19 | Intelligent measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218546841U true CN218546841U (en) | 2023-02-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222198222.1U Active CN218546841U (en) | 2022-08-19 | 2022-08-19 | Intelligent measuring device |
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|---|---|
| CN (1) | CN218546841U (en) |
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- 2022-08-19 CN CN202222198222.1U patent/CN218546841U/en active Active
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