Impedance detection device

Abstract

The utility model discloses an impedance detection device, and belongs to the technical field of impedance detection. The circuit board is arranged in the shell; the display screen is arranged on one side of the shell and is electrically connected with the circuit board; the keyboard and the display screen are located on the same side of the shell, and the keyboard is electrically connected with the circuit board; the signal line penetrates through the shell and is electrically connected with the circuit board; the grounding wire penetrates through the shell and is electrically connected with the circuit board; wherein the circuit board is configured to obtain a current value and a voltage value of the resistor to be detected based on a detection loop formed by the signal line and the grounding line, and the keyboard is configured to input the current value and the voltage value into an impedance calculation formula to obtain impedance. According to the impedance detection device provided by the invention, the signal line and the grounding line are connected with the to-be-detected resistor, and the current value and the voltage value are measured; the impedance of the resistor to be measured can be calculated based on the current value and the voltage value by combining an impedance calculation formula and inputting operational symbols through a keyboard. The impedance detection device is simple in circuit connection, high in measurement efficiency and easy to operate.

Description

Technical Field

[0001] Embodiments of the present application relate to the technical field of impedance detection, and particularly to an impedance detection device. Background Art

[0002] In a lithium battery protection board circuit, a PTC (positive temperature coefficient, thermistor) is connected to communication SDA / SCL ports, playing an important role in protecting communication lines. Moreover, after the PTC is soldered, it will be encapsulated, and the impedance of the PTC cannot be directly measured. If there is a false solder or internal mechanical damage, which is not exposed during the semi-finished product function test but is exacerbated and exposed during the subsequent finished product assembly process, it will cause great losses. Existing detection devices require multiple devices to detect impedance, and the detection process is very cumbersome with low detection efficiency. Summary of the Utility Model

[0003] The purpose of the embodiments of the present application is to provide an impedance detection device to solve the technical problem of the cumbersome detection process of the impedance detection device in the prior art.

[0004] To solve the above technical problem, the embodiments of the present application disclose the following technical solutions:

[0005] The present application provides an impedance detection device, including:

[0006] A housing;

[0007] A circuit board, which is arranged in the housing;

[0008] A display screen, which is arranged on one side of the housing and is electrically connected to the circuit board;

[0009] A keyboard, which is on the same side of the housing as the display screen and is electrically connected to the circuit board;

[0010] A signal line, one end of which passes through the housing and is electrically connected to the circuit board, and the other end of the signal line is located outside the housing;

[0011] A ground wire, one end of which passes through the housing and is electrically connected to the circuit board, and the other end of the ground wire is located outside the housing;

[0012] Wherein, the circuit board is configured to obtain the current value and voltage value of the resistor to be measured based on the detection loop formed by the signal line and the ground wire, and the keyboard is configured to input the current value and voltage value into an impedance calculation formula to obtain the impedance.

[0013] Further, the circuit board includes a PCB board, and an operation chip, a current detection unit, a voltage detection unit, and a power supply are provided on the PCB board;

[0014] The current detection unit is connected in series with the power supply, the voltage detection unit is connected in parallel with the series-connected current detection unit and the power supply, and the operation chip is electrically connected to the power supply;

[0015] Wherein, the current detection unit is electrically connected to the operation chip, and the current detection unit transmits the detected current value to the operation chip; the voltage detection unit is electrically connected to the operation chip, and the voltage detection unit transmits the detected voltage value to the operation chip.

[0016] Further, a memory is also provided on the PCB board, the memory is electrically connected to the operation chip, and the operation chip stores the current value and the voltage value into the memory.

[0017] Further, a first interface, a second interface, a third interface, and a fourth interface are also provided on the PCB board;

[0018] The first interface is electrically connected between the power supply and the signal line, the second interface is electrically connected between the current detection unit and the ground wire, the third interface is electrically connected between the operation chip and the display screen, and the fourth interface is connected between the operation chip and the keyboard;

[0019] The operation chip is configured to receive the data input by the keyboard through the fourth interface, and transmit the data input by the keyboard, the current value, and the voltage value to the display screen for display through the third interface.

[0020] Further, a signal connector is further included, the signal connector is located at the other end of the signal line and is electrically connected to the signal line.

[0021] Further, a ground connector is further included, the ground connector is located at the other end of the ground wire and is electrically connected to the ground wire.

[0022] Further, both the signal connector and the ground connector include metal clips.

[0023] Further, the surfaces of the signal line, the ground wire, the signal connector, and the ground connector are all coated with insulating layers.

[0024] Further, the keyboard includes a numeric keypad and a symbol keypad, the numeric keypad includes numeric buttons and a decimal point button, and the symbol keypad includes a plus button, a minus button, a multiplication button, a division button, an equal sign button, a power-on button, a power-off button, and a clear button.

[0025] Furthermore, the power source includes any one or more of a cylindrical battery, a button battery, a mobile power source and a battery pack.

[0026] One of the above technical solutions has the following advantages or beneficial effects:

[0027] The embodiment of the present application provides an impedance detection device, comprising: a housing; a circuit board, the circuit board is arranged in the housing; a display screen, the display screen is arranged on one side of the housing and electrically connected to the circuit board; a keyboard, the keyboard and the display screen are located on the same side of the housing and electrically connected to the circuit board; a signal line, the signal line passes through the housing and is electrically connected to the circuit board; a ground line, the ground line passes through the housing and is electrically connected to the circuit board; wherein the circuit board is configured to obtain the current value and voltage value of the resistor to be measured based on the detection loop formed by the signal line and the ground line, and the keyboard is configured to input the current value and voltage value into the impedance calculation formula to obtain the impedance. The impedance detection device provided by the present application connects the signal line to one end of the resistor to be measured, and after the ground line is grounded, a detection loop is formed. The current value and voltage value of the resistor to be measured are detected by the detection loop, and then combined with the impedance calculation formula, the operation symbol is input through the keyboard to calculate the impedance of the resistor to be measured based on the current value and voltage value; the impedance can be displayed on the display screen for easy reading. This impedance detection device has simple circuit connection, high measurement efficiency and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings will make the technical solutions and other beneficial effects of the present application apparent.

[0029] Figure 1 A schematic top view of the impedance detection device provided in an embodiment of the present application;

[0030] Figure 2 A schematic diagram of the structure of a circuit board provided in an embodiment of the present application;

[0031] Figure 3 A schematic diagram of the circuit structure of the impedance detection device provided in an embodiment of the present application;

[0032] Figure 4 This is a schematic diagram of the connection structure of the impedance detection device provided in an embodiment of the present application during detection.

[0033] The reference numerals are as follows:

[0034] 100-housing, 200-display screen, 300-keyboard, 400-signal line, 410-signal connector, 500-ground line, 510-ground connector, A1-first interface, A2-second interface, A3-third interface, A4-fourth interface. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are 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. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more, unless otherwise specifically defined.

[0036] The following describes the specific implementation manners of the present application through embodiments:

[0037] Such as Figures 1 to 3As shown, an embodiment of the present application provides an impedance detection device, comprising: a housing 100; a circuit board, the circuit board is arranged in the housing 100; a display screen 200, the display screen 200 is arranged on one side of the housing 100 and is electrically connected to the circuit board; a keyboard 300, the keyboard 300 and the display screen 200 are located on the same side of the housing 100 and are electrically connected to the circuit board; a signal line 400, one end of the signal line 400 passes through the housing 100 and is electrically connected to the circuit board, and the other end of the signal line 400 is located outside the housing 100; a grounding line 500, one end of the grounding line 500 passes through the housing 100 and is electrically connected to the circuit board, and the other end of the grounding line 500 is located outside the housing 100; wherein the circuit board is configured to obtain the current value and voltage value of the resistance to be measured based on the detection loop formed by the signal line 400 and the grounding line 500, and the keyboard 300 is configured to input the current value and voltage value into the impedance calculation formula to obtain the impedance. Specifically, the housing 100 includes an upper housing and a lower housing, and the upper housing and the lower housing are spliced to form an internal cavity, and the circuit board is fixed in the internal cavity. Generally speaking, the shell 100 is made of plastic material and is light and strong. A plurality of slots are provided on the upper surface of the upper shell, which are used to embed and fix the display screen 200 and the keyboard respectively. There are two through holes on the side of the shell 100, wherein the two through holes are used for the signal line 400 and the grounding line 500 to pass through the shell 100 to form an electrical connection with the circuit board. The signal line 400 is connected to one end of the resistor to be measured to obtain the current value in the circuit of the resistor to be measured; the grounding line 500 is connected to the ground end to ensure that a complete detection circuit is formed with the resistor to be measured, thereby obtaining the voltage value at both ends of the resistor to be measured; after obtaining the current value and voltage value, based on the impedance calculation formula, the current value, voltage value and operation symbol are input through the keyboard 300 to calculate the impedance of the resistor to be measured; the obtained current value, voltage value and calculated impedance can all be displayed on the display screen 200 for intuitive reading. The impedance detection device provided above has simple circuit connection, can quickly measure the impedance of the resistor to be measured and is easy to use.

[0038] like Figures 1 to 3As shown, in the embodiment of the present application, the circuit board includes a PCB board, on which an arithmetic chip, a current detection unit, a voltage detection unit, and a power supply are provided; the current detection unit is connected in series with the power supply, the voltage detection unit is connected in parallel with the series-connected current detection unit and the power supply, and the arithmetic chip is electrically connected to the power supply; wherein, the current detection unit is electrically connected to the arithmetic chip, and the current detection unit transmits the detected current value to the arithmetic chip; the voltage detection unit is electrically connected to the arithmetic chip, and the voltage detection unit transmits the detected voltage value to the arithmetic chip. Specifically, after the signal line 400 is connected to the resistor under test, the current detection unit is connected in series with the resistor under test to detect the current. The current detection unit includes an ammeter, a Hall effect sensor, and a transient current detector; wherein, the ammeter can directly measure the magnitude of the current in the loop by being connected in series with the resistor under test; the Hall effect sensor is based on the Hall effect principle and can measure the magnitude of the current passing through the loop by being connected in series with the resistor under test. When current passes through a conductor, the Hall effect sensor can sense the change in the magnetic field and convert it into a voltage signal for measurement; the transient current detector can measure the transient current characteristics in the loop by being connected in series with the resistor under test. The corresponding detection device can be selected according to the actual situation to detect the current of the resistor under test.

[0039] In the embodiment of the present application, after the signal line 400 is connected to the resistor under test and the ground wire 500 is connected to the ground terminal, the voltage detection unit is equivalent to being connected in parallel with the resistor under test. Therefore, the voltage across the resistor under test can be detected through the voltage detection unit, which facilitates the subsequent calculation of the impedance. The voltage detection unit includes a voltmeter, a Hall effect sensor, and a voltage sensor; wherein, the voltmeter can detect the voltage across the resistor under test after being connected in parallel with the resistor under test; after the Hall effect sensor is connected in parallel with the resistor under test, it measures the voltage by sensing the current in the circuit loop under test and according to the change in the magnetic field generated by the Hall effect; the voltage sensor converts the voltage into a corresponding signal for measurement based on principles such as resistance, capacitance, or inductance, thereby obtaining the voltage. The corresponding voltage detection device can be selected according to the actual situation to detect the voltage of the resistor under test.

[0040] In the embodiment of the present application, the arithmetic chip is composed of an Arithmetic Logic Unit (ALU), and the Arithmetic Logic Unit is used to perform arithmetic and logical operations. The Arithmetic Logic Unit can receive numbers and operators input from the keyboard and perform corresponding operations according to the operators. For example, when the addition operator is input, the Arithmetic Logic Unit will add the number and the currently input number and generate an operation result.

[0041] Such as Figures 1 to 3As shown, in an embodiment of the present application, a memory is also provided on the PCB board, and the memory is electrically connected to the computing chip, and the computing chip stores the current value and the voltage value in the memory. Specifically, the memory can store the current value and the voltage value measured by the current detection unit and the voltage detection unit. And when calculating the impedance, it can store the intermediate results and the final results obtained by the calculation for subsequent calculations. As needed, the memory can also store commonly used numbers, corresponding variables, and historical records. The memory provides temporary storage space for storing numbers, results, intermediate values, etc., to facilitate subsequent calculation and retrieval operations.

[0042] like Figures 1 to 3 As shown, in the embodiment of the present application, the PCB board is further provided with a first interface A1, a second interface A2, a third interface A3, and a fourth interface A4; the first interface A1 is electrically connected between the power supply and the signal line 400, the second interface A2 is electrically connected between the current detection unit and the ground line 500, the third interface A3 is electrically connected between the computing chip and the display screen 200, and the fourth interface A4 is connected between the computing chip and the keyboard 300; the computing chip is configured to receive data input from the keyboard 300 through the fourth interface A4, and transmit the keyboard input data, current value, and voltage value to the display screen 200 for display through the third interface A3. Specifically, the first interface A1 and the second interface A2 are interfaces connected to the circuit on the PCB board, and the signal line 400 and the ground line 500 are connected to the circuit through the first interface A1 and the second interface A2, respectively. It is conceivable that the signal line 400 and the ground line 500 can be fixedly connected to the first interface A1 and the second interface A2, or can be pluggable. The third and fourth interfaces A3 and A4 extend from the computing chip. The third interface A3 is used to transmit data to be displayed on the display screen 200 for easy reading. The fourth interface A4 is used to receive numbers or arithmetic symbols input from the keyboard 300, thereby facilitating calculation based on the current and voltage values to obtain the impedance of the resistor under test. Impedance is typically calculated using Ohm's law, which divides the voltage by the current to obtain the impedance.

[0043] In the embodiments of the present application, it should be noted that Figure 4As shown, when calculating the PTC resistance on the battery SDL or SCL line, since there is a fuel meter between the signal line 400 and the ground line 500, in order to prevent the fuel meter from affecting the measured impedance of the PTC resistance, it is necessary to first calculate the equivalent impedance of the fuel meter's internal circuit. Therefore, a standard resistor of known impedance is connected in series with the fuel meter, and then one end of the signal line 400 is connected to the standard resistor, while the ground line 500 is grounded. The first total impedance of the standard resistor and the fuel meter can be calculated by measuring the voltage and current values. Finally, the impedance of the standard resistor is subtracted from the first total impedance to obtain the equivalent impedance of the fuel meter's internal circuit. After obtaining the impedance of the fuel meter, the signal line 400 is connected to one end of the PTC resistor, and the ground line 500 is grounded. The second total impedance is calculated by measuring the voltage and current values. The impedance of the PTC resistor is obtained by subtracting the impedance of the fuel meter from the second total impedance. This impedance detection device has simple circuit connection and high impedance accuracy of the calculated PTC resistor.

[0044] like Figures 1 to 3 As shown, in the embodiment of the present application, the impedance detection device further includes a signal connector 410, which is located at the other end of the signal line 400, that is, the portion located outside the housing 100, and the signal connector 410 is electrically connected to the signal line 400. Specifically, the signal connector 410 facilitates connection of the signal line 400 to the resistor to be measured, thereby transmitting current to the signal line 400 through the signal connector 410, thereby improving the reliability of the connection.

[0045] like Figures 1 to 3 As shown, in the embodiment of the present application, the impedance detection device further includes a grounding connector 510. The grounding connector 510 is located at the other end of the grounding wire 500, that is, the portion located outside the housing 100. The grounding connector 510 is electrically connected to the grounding wire 500. Specifically, the grounding connector 510 facilitates quick connection of the grounding wire 500 to the ground terminal, thereby improving the convenience of connection.

[0046] like Figures 1 to 3 As shown, in an embodiment of the present application, the signal connector 410 and the ground connector 510 both include a metal clip. Specifically, the signal connector 410 and the ground connector 510 are designed as a metal clip structure, which can facilitate the signal connector 410 and the ground connector 510 to easily clamp the resistor to be measured or the ground terminal, making the connection process fast and requiring no additional fixed connection components. At the same time, the metal clip is not easy to loosen after being clamped, reducing the risk of poor contact or signal interference, and having high reliability. Moreover, the signal connector 410 and the ground connector 510 provided with the metal clip have a wide range of applications and do not require excessive adjustments based on the different diameters of the resistor to be measured or the ground terminal. Both thinner wires and thicker resistors can be clamped and connected by the metal clip.

[0047] like Figures 1 to 3As shown, in the embodiment of the present application, the surfaces of the signal line 400, the ground line 500, the signal connector 410, and the ground connector 510 are all coated with an insulating layer. Specifically, by coating the insulating layer on the surfaces of the signal line 400, the ground line 500, the signal connector 410, and the ground connector 510, safety protection can be provided for the signal line 400, the ground line 500, the signal connector 410, and the ground connector 510, preventing electric leakage and reducing the possibility of current entering the external environment or other components; and the insulating layer can ensure the integrity of the signal, ensuring the quality and reliability of signal transmission; in addition, the insulating layer can also play a role in anti-corrosion and improving wear resistance, preventing the signal line 400, the ground line 500, the signal connector 410, and the ground connector 510 from being damaged by the external environment, chemical substances, or physical friction, and extending the service life.

[0048] In the embodiment of the present application, the insulating layer can include an insulating coating, an insulating sleeve, an insulating tape, etc. The actual material or insulating method of the insulating layer can be selected according to the actual situation, and the embodiment of the present application will not list too many here.

[0049] As Figures 1 to 3 shown, in the embodiment of the present application, the keyboard includes a numeric keypad and a symbol keypad. The numeric keypad includes numeric buttons from 0 to 9 and a decimal point button. The symbol keypad includes a plus button, a minus button, a multiplication button, a division button, an equal sign button, a power-on button, a power-off button, and a clear button. Specifically, the numeric keypad is used to input corresponding numbers, and the detected current value or voltage value is input into the arithmetic chip through the numeric buttons from 0 to 9 and the decimal point button; the symbol keypad is used to input plus, minus, multiplication, and division signs, so as to perform corresponding calculations on the current value and voltage value; the symbol keypad can also clear the data by pressing the clear button to avoid excessive data; the symbol keypad can also perform power-off and power-on operations on the impedance detection device through the power-on button and the power-off button, so as to avoid wasting electric energy due to long-term power-on.

[0050] As Figures 1 to 3 shown, in the embodiment of the present application, the power supply includes any one or more of a cylindrical battery, a button battery, a mobile power supply, and a battery pack. Specifically, the cylindrical battery, the button battery, and the battery pack can all be built into the impedance detection device or provide power support for the impedance detection device in a detachable manner; while the mobile power supply can provide power support for the impedance detection device through a charging cable, and the impedance detection device can adopt multiple power supply methods to achieve impedance detection.

[0051] The above has introduced in detail an impedance detection device provided by an embodiment of the present application. Specific examples are used herein to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An impedance detection device, characterized in that, Comprising: A housing (100); A circuit board disposed in the housing (100); A display screen (200) disposed on one side of the housing (100) and electrically connected to the circuit board; A keyboard (300) located on the same side of the housing (100) as the display screen (200) and electrically connected to the circuit board; A signal line (400) having one end passing through the housing (100) and electrically connected to the circuit board, and the other end of the signal line (400) being located outside the housing (100); A ground line (500) having one end passing through the housing (100) and electrically connected to the circuit board, and the other end of the ground line (500) being located outside the housing (100); Wherein, the circuit board is configured to obtain a current value and a voltage value of a resistance to be measured based on a detection loop formed by the signal line (400) and the ground line (500), and the keyboard (300) is configured to input the current value and the voltage value into an impedance calculation formula to obtain an impedance.

2. The impedance detection device according to claim 1, wherein The circuit board includes a PCB board, and an operation chip, a current detection unit, a voltage detection unit and a power supply are provided on the PCB board; The current detection unit is connected in series with the power supply, the voltage detection unit is connected in parallel with the series-connected current detection unit and the power supply, and the operation chip is electrically connected to the power supply; Wherein, the current detection unit is electrically connected to the operation chip, and the current detection unit transmits the detected current value to the operation chip; the voltage detection unit is electrically connected to the operation chip, and the voltage detection unit transmits the detected voltage value to the operation chip.

3. The impedance detection device according to claim 2, characterized in that, A memory is further provided on the PCB board, the memory is electrically connected to the operation chip, and the operation chip stores the current value and the voltage value into the memory.

4. The impedance detection device according to claim 3, characterized in that, A first interface (A1), a second interface (A2), a third interface (A3) and a fourth interface (A4) are further provided on the PCB board; The first interface (A1) is electrically connected between the power supply and the signal line (400), the second interface (A2) is electrically connected between the current detection unit and the ground line (500), the third interface (A3) is electrically connected between the operation chip and the display screen (200), and the fourth interface (A4) is connected between the operation chip and the keyboard (300); The operation chip is configured to receive data input by the keyboard (300) through the fourth interface (A4), and transmit the data input by the keyboard (300), the current value and the voltage value to the display screen (200) for display through the third interface (A3).

5. The impedance detection device according to claim 1, characterized in that A signal connector (410) is further included, the signal connector (410) is located at the other end of the signal line (400) and is electrically connected to the signal line (400).

6. The impedance detection device according to claim 5, characterized in that, It further includes a ground joint (510) which is located at the other end of the ground wire (500) and is electrically connected to the ground wire (500).

7. The impedance detection device according to claim 6, characterized in that, Both the signal joint (410) and the ground joint (510) include metal clips.

8. The impedance detection device according to claim 6, characterized in that, The surfaces of the signal wire (400), the ground wire (500), the signal joint (410) and the ground joint (510) are all coated with insulating layers.

9. The impedance detection device according to claim 1, wherein The keyboard includes a numeric keypad and a symbol keypad. The numeric keypad includes numeric buttons and a decimal point button. The symbol keypad includes a plus button, a minus button, a multiplication button, a division button, an equal sign button, a power-on button, a power-off button and a clear button.

10. The impedance detection device according to claim 2, wherein, The power supply includes any one or more of a cylindrical battery, a button battery, a mobile power supply and a battery pack.

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