CN216696449U - Current voltmeter - Google Patents

Abstract

The current voltmeter provided by the utility model comprises a detection circuit and a power supply circuit, wherein: the detection circuit comprises a first input interface and a first output interface, the first input interface is used for being connected with a first power supply, and the first output interface is used for being connected with a component to be detected to form a loop; the power supply circuit comprises a second input interface and a measuring component, the second input interface is used for being connected with a second power supply to supply power to the measuring component, and the measuring component is used for measuring the current value and/or the voltage value of the component to be measured according to the detection circuit; first power and second power are different power to the electric quantity of first power input is used for importing the part that awaits measuring purely, and measuring component's power consumption can not cause the influence to detection circuitry. The grounding ends of the detection circuit and the measurement assembly are isolated from each other, so that the detection circuit and the power supply circuit cannot form a loop at the grounding end, and the detection circuit and the power supply circuit are prevented from generating interference or short circuit.

Description

Current voltmeter

Technical Field

The utility model relates to the technical field of electronics, in particular to a current voltmeter.

Background

The current voltmeter is an instrument for measuring the current value and/or the voltage value of a component to be measured, and can be used for measuring the performance of a mainboard and various electronic components of terminal equipment.

The principle of current voltmeter measurement is as follows: and introducing current into the part to be measured, so as to measure the current value and/or the voltage value of the part to be measured in the formed loop through the measuring assembly. In the prior art, the current introduced into the current voltmeter is divided into two purposes: 1. the measuring component is used for driving the measuring component to work; 2. for inputting the component under test to enable the measurement assembly to measure the component under test. Since the measuring component has power loss, the current in the current voltmeter is not pure for inputting the component to be measured, and the measurement of the current voltmeter is misjudged. For example, when a fluctuating current is present, it is unclear whether the current leakage occurs in the measurement component or the current of the component to be measured itself changes.

Therefore, the above problems in the prior art have yet to be solved.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a current-voltage meter, and aims to solve the problem that a measurement component of the current-voltage meter has power loss, so that the measurement is inaccurate.

In order to achieve the above object, the present invention provides a current-voltage meter, which includes a detection circuit and a power supply circuit, wherein: the detection circuit comprises a first input interface and a first output interface, wherein the first input interface is used for being connected with a first power supply, and the first output interface is used for being connected with a component to be detected to form a loop; the power supply circuit comprises a second input interface and a measuring component, wherein the second input interface is used for being connected with a second power supply to supply power to the measuring component, and the measuring component is used for measuring the current value and/or the voltage value of the component to be measured according to the detection circuit; the first power supply and the second power supply are different power supplies, and the grounding ends of the detection circuit and the measurement component are isolated from each other.

Preferably, at least one of the first input interface and the second input interface is connected to a first power supply isolation module, and the first power supply isolation module is configured to isolate the detection circuit from a ground terminal of the measurement component to achieve power supply isolation.

Preferably, the second input interface is connected to the first power isolation module, wherein: the second input interface is connected with the first coil of the first power supply module; the measuring component is connected with the second coil of the first power supply module; when the second input interface is connected with the second power supply, the first coil and the second coil are electromagnetically induced.

Preferably, a voltage reduction unit is arranged between the measurement component and the first power supply isolation module, and the voltage reduction unit is used for preventing the measurement component from reversely inputting current to the first power supply isolation module.

Preferably, the power supply circuit further includes a data module and a second output interface, and the data module is configured to be connected to the component to be tested through the second output interface and send communication data, so that the component to be tested is connected to the loop of the detection circuit according to the communication data.

Preferably, the power supply circuit further comprises a second power supply isolation module, and at least one of the data module and the measurement component is connected with the second power supply isolation module to realize isolation between the ground terminals.

Preferably, the first output interface and the second output interface are integrated in the same external interface.

Preferably, the current voltmeter further comprises a USB interface, the first output interface is configured as a part of pins of the USB interface, and the second output interface is configured as another part of pins of the USB interface.

Preferably, the data module comprises a data expansion card and a socket, the socket is connected with the power supply circuit, the data expansion card is used for storing the communication data, and the data expansion card is detachably inserted into the socket.

Preferably, the current voltmeter further comprises a mechanical assembly, the measuring assembly comprises a main board and a display screen, wherein: the mechanical assembly is used for measuring the current value and/or the voltage value of the component to be measured according to the detection circuit and indicating the measurement result through a mechanical pointer; the mainboard is used for measuring the current value and/or the voltage value of the component to be measured according to the detection circuit and indicating the measurement result through the display screen; the main board is provided with an avoiding part so that the mechanical pointer and the display screen are exposed on the same surface.

The current voltmeter provided by the technical scheme of the utility model comprises a detection circuit and a power supply circuit, wherein: the detection circuit comprises a first input interface and a first output interface, wherein the first input interface is used for being connected with a first power supply, and the first output interface is used for being connected with a component to be detected to form a loop; the power supply circuit comprises a second input interface and a measuring component, the second input interface is used for being connected with a second power supply to supply power to the measuring component, and the measuring component is used for measuring the current value and/or the voltage value of the component to be measured according to the detection circuit; the first power supply and the second power supply are different power supplies, and grounding ends of the detection circuit and the measuring assembly are isolated from each other. Because detection circuitry and supply circuit are supplied power by different power respectively to the electric quantity of first power input is used for the input part that awaits measuring purely, and measuring component's power consumption can not cause the influence to detection circuitry. Meanwhile, the grounding ends of the detection circuit and the measurement assembly are isolated from each other, so that the detection circuit and the power supply circuit cannot form a loop at the grounding end, and the detection circuit and the power supply circuit are prevented from generating interference or short circuit.

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 structures shown in the drawings without creative efforts.

FIG. 1 is a perspective view of a current-voltage meter according to the present invention from a front perspective;

FIG. 2 is a perspective view of a back view of a current-voltage meter according to the present invention;

FIG. 3 is a schematic diagram of current sensing in the measurement assembly of the current-voltage meter of the present invention;

FIG. 4 is a schematic diagram of the second input interface connected to the first power isolation module according to the present invention;

FIG. 5 is a schematic diagram of a first power isolation module of the present invention;

FIG. 6 is a schematic diagram of a current-voltage meter unplugged output expansion card provided by the present invention;

FIG. 7 is a side view of the current voltmeter provided in the utility model with the housing removed;

FIG. 8 is a schematic diagram of the current-voltage meter according to the present invention for providing power isolation between the detection circuit and the power supply circuit;

FIG. 9 is a schematic view of a view-angle mounting of the internal circuit board of the current-voltage meter according to the present invention;

fig. 10 is a schematic view of another view of the installation of the internal circuit board of the current-voltage meter according to the present invention.

The reference numbers illustrate:

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

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.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The current voltmeter is an instrument for measuring the current value and/or the voltage value of a component to be measured, and can be used for measuring the performance of a main board of terminal equipment and various electronic components.

The principle of current voltmeter measurement is as follows: and introducing current into the part to be measured, so as to measure the current value and/or the voltage value of the part to be measured in the formed loop through the measuring assembly. Currently, the current passing into the current voltmeter is divided into two purposes:

1. the measuring component is used for driving the measuring component to work; optionally, the measurement component may include a digital display module, the digital display module includes a main board and a display screen, and the main board detects a current value and/or a voltage value of the component to be measured and displays a measurement result through the display screen.

2. For inputting the component under test to enable the measurement assembly to measure the component under test.

However, since the measuring unit itself has a power loss, for example, when the measuring unit includes a digital display module, the display screen needs to be operated to consume power. The current in the current voltmeter is not pure to be input into the component to be tested, so that the measurement of the current voltmeter is misjudged. For example, when a fluctuating current is present, it is unclear whether the current leakage occurs in the measurement component or the current of the component to be measured itself changes.

Therefore, in order to solve the above problem, embodiments of the present application provide a current-voltage meter, which avoids interference of power consumption of a measurement component on measurement by respectively connecting mutually independent circuits for the measurement component and a component to be measured.

For the convenience of understanding, the current-voltage meter provided by the embodiment of the application is described in detail below with reference to the accompanying drawings.

Referring to fig. 1 and fig. 2, fig. 1 is a perspective view of a front view of a current-voltage meter according to an embodiment of the present disclosure; fig. 2 is a perspective view of a back view of a current voltmeter according to an embodiment of the present disclosure. As shown in fig. 1 and fig. 2, the current-voltage meter provided in the embodiment of the present application includes a detection circuit and a power supply circuit, wherein:

the detection circuit comprises a first input interface 100 and a first output interface 200, wherein the first input interface 100 is used for being connected with a first power supply, and the first output interface 200 is used for being connected with a component to be detected to form a loop.

Alternatively, as shown in fig. 2, the first input interface 100 is a dc input interface disposed on the back side of the current voltmeter, and the first output interface 200 is a dc output interface disposed on the front side of the current voltmeter. The direct current output interface is used for connecting a detection line, and the detection line is connected with the component to be detected so as to form a loop with the component to be detected.

The power supply circuit comprises a second input interface 300 and a measuring component, wherein the second input interface 300 is used for being connected with a second power supply to supply power to the measuring component, and the measuring component is used for measuring the current value and/or the voltage value of the component to be measured according to the detection circuit; the first power supply and the second power supply are different power supplies, and grounding ends of the detection circuit and the measuring assembly are isolated from each other.

Optionally, as shown in fig. 2, the second input interface 300 is a Type-C interface disposed on the back of the current voltmeter. And the Type-C interface is connected with a second power supply so as to supply power to the measuring component.

It should be noted that the first power supply and the second power supply may be two independent power supplies, or may be integrated on the same power supply device. For example, a power supply device is provided with a Type-C output interface and a dc output interface, where the Type-C output interface and the dc output interface respectively correspond to two mutually independent circuits on the power supply device, and belong to output interfaces of two different power supplies integrated on the same device. The power supply device is connected with the second input interface 300 through the Type-C output interface, and is connected with the first output interface 200 through the dc output interface. Thereby enabling the connection of two different power supplies to the first output interface 200 and the second input interface 300, respectively.

In this embodiment, the first power supply, the first input interface 100 and the first output interface 200 are connected to form a detection circuit, and the detection circuit is connected to the component to be tested to form a loop, so that the current voltmeter can obtain the electrical signal of the component to be tested. The second power supply, the second input interface 300 and the measurement component are connected to form a power supply circuit, and the measurement component can normally work by the power supply of the power supply circuit. Further, the measuring component acquires and measures the electric signal of the detection circuit, so that the current value and/or the voltage value of the component to be measured are/is measured. Because detection circuitry and supply circuit are supplied power by different power respectively to the electric quantity of first power input is used for the input part that awaits measuring purely, and measuring component's power consumption can not cause the influence to detection circuitry. Meanwhile, the grounding ends of the detection circuit and the measurement assembly are isolated from each other, so that the detection circuit and the power supply circuit cannot form a loop at the grounding end, and the detection circuit and the power supply circuit are prevented from generating interference or short circuit.

It should be noted that, in the above manner, the power supply isolation between the detection circuit and the measurement component is realized, in this case, in order to enable the measurement component to measure the electrical signal of the detection circuit, a person skilled in the art may realize the isolation in various manners. For example, the magnet and the coil are respectively arranged on the detection circuit and the power supply circuit, so that the measuring component can measure the electric signal of the detection circuit in an electromagnetic induction mode, and thus the current value and/or the voltage value of the component to be measured can be obtained. The measurement of the detection circuit by the measurement component can also be realized by other ways by those skilled in the art, and the embodiments of the present application are not limited thereto.

As an alternative implementation, please refer to fig. 3, in which fig. 3 is a schematic diagram of current detection in a measurement component of a current voltmeter in the embodiment of the present application. As shown in fig. 3, the current measurement subassembly 400 of the measurement assembly includes a digital-to-analog conversion unit 410, and optionally, the digital-to-analog conversion unit 410 may be of a model TM7707, which is completely compatible in hardware circuits because the TM7707 is PIN-to-PIN (PIN) compatible. In the peripheral circuit, the TM7707 does not have an oscillator and a reference voltage inside, and an external crystal oscillator circuit and a reference circuit are required. Therefore, the digital-to-analog conversion unit 410 is externally connected with a crystal resonator patch 420, and the crystal resonator patch 420 is connected with the digital-to-analog conversion unit 410 through a clock signal pin MCLK of the digital-to-analog conversion unit 410. Further, the digital-to-analog conversion unit 410 is also connected to the power supply VDD through the reference signal pin REF, thereby obtaining a reference signal. The power supply VDD is the power supply obtained after the second input interface 300 is connected to the second power supply. After the measuring component acquires the electrical signal IN the detection circuit, the electrical signal to be tested TEXT IN is input into the digital-to-analog conversion unit 410 through the differential input pin, and the digital-to-analog conversion unit 410 compares the electrical signal to be tested with the reference signal, so that the size of the signal to be tested TEXT IN is determined. And then the detection result PA3 is sent to a display subassembly of the measurement component through a DOUT pin for displaying.

Optionally, the isolation of the detection circuit from the ground of the measurement component can be achieved in various ways, and for the sake of understanding, the embodiments of the present application provide a preferred implementation, which is described in detail below.

Preferably, at least one of the first input interface 100 and the second input interface 300 is connected to the first power isolation module 500, and the first power isolation module 500 is used for isolating the ground terminals of the detection circuit and the measurement component to realize power isolation.

In this embodiment, the detection circuit and the power supply circuit may be integrated circuits disposed on the same circuit board, and the first power supply isolation module 500 is disposed on the circuit board, so that the first power supply isolation module 500 isolates the detection circuit from the ground terminal of the measurement component, thereby saving the space of the circuit board and achieving the purpose of ground terminal isolation.

It should be noted that the specific structure of the first power isolation module 500 can be implemented in various ways, and for understanding, the embodiment of the present application provides a specific implementation manner as follows.

Referring to fig. 4 and 5, fig. 4 is a schematic diagram illustrating a second input interface connected to a first power isolation module according to an embodiment of the present disclosure; fig. 5 is a schematic diagram of a first power isolation module in an embodiment of the present application. As shown in fig. 4, the second input interface 300 is configured as a TYPE-C interface, the second input interface 300 is connected to the pins No. 1 and No. 2 in fig. 4, respectively, and the pins No. 4 and No. 6 in fig. 4 are connected to the measurement component, respectively. The four pins of the first power isolation module 500 are connected to pins No. 1, No. 2, No. 4, and No. 6 in fig. 4, respectively. The specific structure of the first power isolation module 500 is shown in fig. 5, the first power isolation module 500 includes a first coil 510 and a second coil 520, and the second input interface 300 is connected to the first power isolation module 500, where: the second input interface 300 is connected with the first coil 510 of the first power supply module; the measuring component is connected with the second coil 520 of the first power supply module; when the second input interface 300 is connected to the second power source, the first coil 510 and the second coil 520 are electromagnetically induced.

In this embodiment, as shown in fig. 5, the pins of the second input interface 300 connected to the first power supply isolation module 500 include an input terminal Vin and a ground terminal GND, through electromagnetic induction between the first coil 510 and the second coil 520, the electric quantity input by the second input interface 300 is transmitted from the first coil 510 to the second coil 520, and a + Vo pin and a 0V pin of the second coil are respectively connected to the measurement component, so that the measurement component obtains the electric quantity input by the second input interface 300. Since the electric quantity is transmitted by the electromagnetic induction, the + Vo pin and the 0V pin are no longer connected to the ground terminal GND of the second input interface 300, and thus, the measurement component is isolated from the ground terminal, and thus, the measurement component is not grounded to the detection circuit.

It should be noted that, since the electric quantity is transferred between the first coil 510 and the second coil 520 by electromagnetic induction, the electric quantity may be transferred from the first coil 510 to the second coil 520, or may be reversely transferred from the second coil 520 to the first coil 510. If the power of the measuring component is reversely transferred to the first coil 510 through the second coil 520, the power will be transferred from the first coil 510 to the ground terminal of the second input interface 300, and since the ground terminal of the second input interface 300 is in common with the ground terminal of the detection circuit, the current fluctuation of the detection circuit will be affected, and thus the accuracy of the measurement will be affected.

Optionally, referring to fig. 4, in order to solve the above problem, as shown in fig. 4, a voltage reducing unit 600 is disposed between the measurement device and the first power supply isolation module 500, and the voltage reducing unit 600 is used to prevent the measurement device from reversely inputting current to the first power supply isolation module 500.

In this embodiment, the voltage dropping unit 600 is disposed between the measurement component and the first power isolation module 500, so that the voltage output by the first power isolation module 500 is higher than the voltage of the measurement component, and therefore, the current can only be transmitted from the first power isolation module 500 to the measurement component in a unidirectional manner, and the measurement component does not reversely input the current to the first power isolation module 500. Therefore, the problem that the reverse input current of the measuring assembly influences the measuring precision is solved.

It should be noted that, when the first isolation module is not configured in the manner shown in fig. 5, but in other manners, the voltage reduction unit 600 may still be disposed between the measurement component and the first isolation module, and the problem of reverse input of current to the first power supply isolation module 500 by the measurement component can also be solved.

The above detailed description of the specific implementation of the detection circuit and the supply circuit is given, by which the power consumption of the measuring assembly does not affect the detection circuit. The accuracy of current voltmeter measurement has been promoted.

Optionally, in the current voltmeter provided in the embodiment of the present application, the component to be tested may include a terminal motherboard, for example, a motherboard of a smart phone. Taking a smart phone as an example, for the purpose of privacy of hardware ecology, a battery of a factory is often provided with a chip in a battery of a current mobile phone manufacturer, when a mobile phone motherboard is powered on with the battery, the battery is in protocol communication with the mobile phone motherboard through the built-in chip, and after a protocol passes verification, the mobile phone motherboard is connected with a circuit between the battery and the battery, so that the battery of a non-factory is prevented from being used on the mobile phone of the brand. Therefore, a general current voltmeter serving as a power supply of a non-original factory cannot be connected with a mobile phone mainboard to form a loop when the mobile phone mainboard is measured.

In order to solve the above problems, the embodiments of the present application further provide the following solutions, which are described in detail below with reference to the accompanying drawings for easy understanding.

Referring to fig. 6 and 7, fig. 6 is a schematic diagram of a current voltmeter unplugged output expansion card according to an embodiment of the present application; fig. 7 is a side view of a current voltmeter with a housing removed according to an embodiment of the present application. As shown in fig. 6 and fig. 7, the power supply circuit provided in the embodiment of the present application further includes a data module 700 and a second output interface 800, where the data module 700 is configured to be connected to the component to be tested through the second output interface 800 and send communication data, so that the component to be tested connects a loop of the detection circuit according to the communication data.

In this embodiment, the data stored in the data module 700 is used to simulate the communication data of the original battery of the mobile phone manufacturer, and the mobile phone motherboard passes the verification according to the communication data and is connected to the loop of the detection circuit by sending the communication data to the mobile phone motherboard to be detected. Therefore, the current voltmeter provided by the embodiment of the application can be used for detecting the mainboard of the mobile phone. Based on the same principle, the component to be measured by the current voltmeter in the embodiment of the application may further include a motherboard or a component of different terminals, such as a tablet computer motherboard or a notebook computer motherboard.

Optionally, because the communication protocols between the main board 10 and the battery of the intelligent terminal are different for different manufacturers and different models of intelligent terminals, in order to enable the current voltmeter provided in the embodiment of the present application to measure more terminal main boards of different models, the data module 700 provided in the embodiment of the present application includes a data expansion card 710 and a socket 720. The socket 720 is connected with the power supply circuit, the data expansion card 710 is used for storing communication data, and the data expansion card 710 is detachably inserted into the socket 720.

In this embodiment, by setting the socket 720 and the data expansion card 710, a user can insert the corresponding data expansion card 710 into the socket 720 according to the difference of the terminal motherboard 10 to be tested, and the data expansion card 710 stores communication data corresponding to the terminal motherboard to be tested. So that the same current voltmeter can measure terminal mainboards of various models.

Furthermore, because the detection of the terminal main board requires the current voltmeter to input the communication data and the detection current at the same time, the embodiment of the application adopts the following scheme for convenient input.

The first output interface 200 and the second output interface 800 are integrated into the same external interface.

In this embodiment, the first output interface 200 and the second output interface 800 are integrated in the same external interface, so that only the unified external interface is needed to be connected to the terminal motherboard to be tested, and the communication data and the detection current can be simultaneously input to the terminal motherboard.

As a preferred implementation manner, the external interface may be configured as a USB interface 900, the first output interface 200 is configured as a part of pins of the USB interface 900, and the second output interface 800 is configured as another part of pins of the USB interface 900.

In this embodiment, please refer to fig. 6 to 8, and fig. 8 is a schematic diagram illustrating power isolation between a detection circuit and a power supply circuit in a current-voltage meter according to an embodiment of the present disclosure. As shown in fig. 6 to 8. The first input interface 100 is connected to the USB interface 900 via the input board 20 and the main board 10 in this order, and does not include any power consuming component. The second input interface 200 is connected to the main board 10 via the input board 20, and supplies power to the measurement components provided on the main board 10. The measuring component comprises a display screen 12 arranged on the mainboard 10, and a socket 720 for a measuring chip and a digital display module.

As shown in fig. 8, the USB interface 900 generally includes 9 pins, wherein 7 pins are connected to the data module 700 as the second output interface 800, and are used for transmitting communication data to the terminal motherboard 10 to be tested. The other 2 pins are connected to the detection circuit as the first output interface 200, and are used for transmitting detection power to the terminal motherboard 10 to be detected. In the detection process, after the data line is inserted into the USB interface 900, the user connects the data line with the terminal motherboard 10 to be detected, and can input communication data and detection current to the terminal motherboard 10 to be detected at the same time.

In the operation mode shown in fig. 8, the power supply circuit for the second output interface 800 is isolated from the detection circuit for the first output interface 200, so that the output current of the first output interface 200 is not affected, and the detection accuracy is improved.

It should be noted that, in the above working process, the power supply circuit needs to provide power for the data module 700 in addition to providing power for the measurement component, so that the data module 700 can output communication data according to the input power. Since the data module 700 and the measurement module share a ground terminal, during a specific operation, a ground current of the data module 700 and a ground current of the measurement module may be conducted at the ground terminal to form a short circuit.

Therefore, in order to solve the above problem, the power supply circuit provided in the embodiment of the present application further includes a second power supply isolation module (not shown in the figure), and at least one of the data module 700 and the measurement component is connected to the second power supply isolation module to achieve isolation between the ground terminals.

In this embodiment, the second power supply isolation module is provided to isolate the ground terminal between the data module 700 and the measurement module, thereby avoiding the short circuit between the two modules.

The circuit structure of the current voltmeter provided in the embodiment of the present application is described in detail above, and as for the implementation manner of the specific hardware, the current voltmeter can be implemented in various manners, which is not limited in the embodiment of the present application. As an alternative implementation, please refer to fig. 9, where fig. 9 is a schematic view illustrating an installation of a view angle of an internal circuit board of a current-voltage meter according to an embodiment of the present application. As shown in fig. 9, the current voltmeter provided in the embodiment of the present application can be implemented by an integrated circuit, and specifically includes a motherboard 10 and an input board 20, and the detection circuit and the power supply circuit are implemented by the motherboard 10 and the input board 20.

Preferably, the motherboard 10 and the input board 20 are PCB boards respectively, and the input board 20 is inserted into the motherboard 10 through the first PCIE socket 11 to implement connection, where: the input board 20 is provided with a dc input interface and a Type-C interface, wherein the dc input interface is a first input interface 100, and the Type-C interface is a second input interface 300. So that the currents of the first power supply and the second power supply can be input to the main board 10. The input board 20 is further provided with a data module 700 and a second power isolation module, so that power isolation of the data module 700 and the measurement component is realized on the input board 20. Further, the measurement component is disposed on the motherboard 10, and the first power isolation module 500 is further disposed on the motherboard 10, so that power isolation between the measurement component and the detection circuit is realized on the motherboard 10.

Further, the main board 10 is further provided with a dc output interface and a USB interface 900, the dc output interface is a first implementation manner of the first output interface 200, and the current voltmeter can be connected to the probe through the dc output interface, so as to be used as a common current voltmeter.

Optionally, the USB interface 900 has 9 pins in total, where 7 pins serve as the second output interface 800 for outputting the communication data of the data module 700, and the other 2 pins serve as the first output interface 200 for outputting the detection current of the detection circuit, so that a user connects a data line through the USB interface 900, and then connects the data line to the terminal motherboard 10 to be detected, that is, the communication data and the detection current can be simultaneously sent to the terminal motherboard 10, so as to detect the terminal motherboard 10.

In this embodiment, the current voltmeter provided by the embodiment of the present application includes two sets of input and output interfaces, and corresponds to the circuit in which two ground terminals are isolated from each other, thereby ensuring the pureness of the current of the input component to be measured, avoiding the current interference of the power consumption of the measurement component and the data module 700 on the component to be measured, and further improving the accuracy of the measurement. Further, the output interface of the current voltmeter comprises a direct current output interface and a USB output interface. When the direct current output interface is used for outputting, the current voltmeter provided by the embodiment of the application can be used as an ordinary current voltmeter. When the output is output by using the USB interface 900, the current voltmeter provided in the embodiment of the present application can be used as a current voltmeter dedicated for detecting the terminal main board 10. Thereby realizing one meter with multiple purposes.

As a preferred implementation manner, the measurement module described in the embodiment of the present application is a digital display measurement module, and includes the aforementioned main board 10, and a display screen 12 disposed on the main board 10. The method has the advantages of displaying accurate numerical values and facilitating users to accurately read measurement results. However, the disadvantage is that the refreshing of the digital display measurement component is delayed, which makes the detection of the digital display measurement component insensitive and cannot capture short-time current fluctuation, for example, the refreshing time of the current digital display measurement component is generally 300 ms/time, i.e. about 1 second refreshes three times. For instantaneous currents with an occurrence time shorter than 300ms, the digital display measurement component cannot measure the instantaneous currents. Further, there is currently a mechanical measuring assembly that is capable of indicating a measurement result by means of a mechanical pointer through the principle of electromagnetic induction. The method has the advantages of real-time measurement and high sensitivity. It does not resolve the exact numerical value well.

Therefore, the above problems are not solved, and the embodiments of the present application provide a solution for integrating a mechanical digital display in the provided current voltmeter, and for easy understanding, the following detailed description is made with reference to the accompanying drawings.

Referring to fig. 10, fig. 10 is a schematic view illustrating another view angle of the internal circuit board of the current-voltage meter according to the embodiment of the present application. As shown in fig. 10, the current voltmeter provided in the embodiment of the present application further includes a mechanical assembly 30, and the measuring assembly includes a main board 10 and a display screen 12, wherein: the mechanical assembly 30 is used for measuring the current value and/or the voltage value of the part to be measured according to the detection circuit and indicating the measurement result through a mechanical pointer 31; the main board 10 is used for measuring the current value and/or the voltage value of the component to be measured according to the detection circuit, and indicating the measurement result through the display screen 12; the main board 10 is provided with an avoiding portion 13, and optionally, the avoiding portion 13 is provided as a through hole provided in the main board 10. So that the mechanical pointer 31 and the display screen 12 are exposed to the same surface.

In this embodiment, the main board 10 of the digital display measurement component is provided with the avoiding portion 13, so that the mechanical pointer 31 of the mechanical component 30 can be exposed to the surface of the display screen 12 through the avoiding portion 13. Therefore, the user can observe the measurement results of the digital display measurement assembly and the mechanical assembly 30 at the same time, and the sensitivity and the accuracy of reading are considered.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or any other related technical fields, which are directly or indirectly applied to the present invention, are included in the scope of the present invention.

Claims (10)

1. A current-voltage meter comprising a detection circuit and a supply circuit, wherein:

the detection circuit comprises a first input interface and a first output interface, wherein the first input interface is used for being connected with a first power supply, and the first output interface is used for being connected with a component to be detected to form a loop;

the power supply circuit comprises a second input interface and a measuring component, the second input interface is used for being connected with a second power supply to supply power to the measuring component, and the measuring component is used for measuring the current value and/or the voltage value of the component to be measured according to the detection circuit;

the first power supply and the second power supply are different power supplies, and grounding ends of the detection circuit and the measurement assembly are isolated from each other.

2. The voltmeter according to claim 1, wherein at least one of the first input interface and the second input interface is connected to a first power isolation module, and the first power isolation module is configured to isolate the detection circuit from a ground terminal of the measurement component for power isolation.

3. The current voltmeter of claim 2 wherein the second input interface is connected to the first power isolation module, wherein:

the second input interface is connected with a first coil of the first power supply module;

the measuring component is connected with a second coil of the first power supply module;

when the second input interface is connected with the second power supply, the first coil and the second coil are subjected to electromagnetic induction.

4. The voltmeter according to claim 2, wherein a voltage dropping unit is disposed between the measuring component and the first power supply isolation module, and the voltage dropping unit is configured to prevent the measuring component from reversely inputting a current to the first power supply isolation module.

5. The voltmeter according to claim 1, wherein the power supply circuit further comprises a data module and a second output interface, the data module is configured to connect with the component to be tested through the second output interface and send communication data, so that the component to be tested is connected with the loop of the detection circuit according to the communication data.

6. The voltmeter according to claim 5 wherein said power supply circuit further comprises a second power isolation module, at least one of said data module and said measurement component being coupled to said second power isolation module for isolation between ground terminals.

7. The voltmeter according to claim 5, wherein the first output interface and the second output interface are integrated in a same external interface.

8. The current voltmeter according to claim 5, wherein the current voltmeter further comprises a USB interface, the first output interface is configured as a part of pins of the USB interface, and the second output interface is configured as another part of pins of the USB interface.

9. The voltmeter according to claim 5 wherein said data module comprises a data expansion card and a socket, said socket being connected to said power supply circuit, said data expansion card being adapted to store said communication data, said data expansion card being removably insertable into said socket.

10. The voltmeter according to claim 1, wherein said voltmeter further comprises a mechanical assembly, said measurement assembly comprises a motherboard and a display screen, wherein:

the mechanical assembly is used for measuring the current value and/or the voltage value of the component to be measured according to the detection circuit and indicating the measurement result through a mechanical pointer;

the main board is used for measuring the current value and/or the voltage value of the component to be measured according to the detection circuit and indicating the measurement result through the display screen;

an avoiding part is arranged on the main board so that the mechanical pointer and the display screen are exposed out of the same surface.

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