CN219574220U - Current testing device and display screen testing equipment - Google Patents

Abstract

The utility model discloses a current testing device and display screen testing equipment. The current testing device includes: the power supply circuit, the detection circuit and the enabling module; the power supply circuit comprises a power input interface, a power supply switch module and a power output interface which are sequentially connected in series, and the power output interface is connected with a load; the detection circuit comprises a current acquisition module and a test module which are connected with each other, the test module is connected with the power output interface, and the detection circuit is configured to control the disconnection or connection of the power supply switch module according to the connection state of the current acquisition module and the current input interface, so that the power supply current of the load is acquired through the current acquisition module; the enabling module is respectively connected with the testing module and the power supply switch module, and is configured to output a collection enabling signal to the power supply switch module when detecting that the voltage at two ends of the testing module has a pressure difference so as to disconnect the power supply switch module. The technical scheme of the embodiment of the utility model improves the efficiency and accuracy of the display screen current test.

Description

Current testing device and display screen testing equipment

Technical Field

The utility model relates to the technical field of display, in particular to a current testing device and display screen testing equipment.

Background

Along with the development of display technology, the application of the liquid crystal display is more and more widespread, and in the detection of the liquid crystal display, the measurement of the voltage and the current of the liquid crystal display is indispensable.

When the current test is carried out on the display screen, a resistor of 0 omega is reserved in a power supply circuit of the display screen, and when the test is carried out, the resistor is required to be removed firstly, and a universal meter is connected in series; another proposal is to concatenate current acquisition chips in advance.

However, the first scheme needs to manually remove the reserved resistor before detection, and the time is long, so that the test efficiency is low; in the second scheme, the current acquisition chip is used for a long time, so that the current acquisition chip is not calibrated in time, and the error is high.

Disclosure of Invention

The utility model provides a current testing device and display screen testing equipment, which are used for improving the efficiency and accuracy of display screen current testing.

According to an aspect of the present utility model, there is provided a current testing apparatus including: the power supply circuit, the detection circuit and the enabling module;

the power supply circuit comprises a power input interface, a power supply switch module and a power output interface which are sequentially connected in series, wherein the power output interface is connected with a load, and the power supply circuit is configured to provide power supply voltage for the load through the power output interface when the power supply switch module is conducted;

The detection circuit comprises a current acquisition module and a test module which are connected with each other, the test module is connected with the power output interface of the power supply circuit, and the detection circuit is configured to control the disconnection or connection of the power supply switch module according to the connection condition of the current acquisition module and the power input interface so as to acquire the power supply current of the load through the current acquisition module;

the enabling module is respectively connected with the testing module and the power supply switch module, and is configured to output an acquisition enabling signal to the power supply switch module when detecting that the voltage at two ends of the testing module has a pressure difference so as to disconnect the power supply switch module.

Optionally, the enabling module comprises a processing unit and a voltage acquisition unit;

the voltage acquisition unit is connected with the test module and is configured to acquire a first voltage at a first end of the test module and a second voltage at a second end of the test module;

the processing unit is connected with the voltage acquisition unit, the processing unit is connected with the enabling end of the power supply switch module, and the processing unit is configured to output an acquisition enabling signal to the power supply switch module when the first voltage and the second voltage have a pressure difference so as to enable the power supply switch module to be disconnected.

Optionally, the enabling module comprises a comparator;

the first input end of the comparator is connected with the first end of the test module, the second input end of the comparator is connected with the second end of the test module, the output end of the comparator is connected with the enabling end of the power supply switch module, and the comparator is configured to output a collection enabling signal to the power supply switch module when the voltage at two ends of the test module has a differential pressure so as to disconnect the power supply switch module.

Optionally, the power supply circuit includes a first power supply branch and a second power supply branch, the detection circuit includes a first detection branch and a second detection branch, the power supply switch module includes a first power supply switch unit and a second power supply switch unit, the power input interface includes a first input sub-interface and a second input sub-interface, the power output interface includes a first output sub-interface and a second output sub-interface, and the current collection module includes a first current collection unit and a second current collection unit; the test module comprises a first test unit and a second test unit;

the first power supply branch comprises a first input sub-interface, a first power supply switch unit and a first output sub-interface which are sequentially connected in series, and the first output sub-interface is connected with the load;

The first detection branch comprises the first current acquisition unit and the first test unit which are mutually connected, and the first test unit is connected with the first output sub-interface;

the second power supply branch comprises a second input sub-interface, a second power supply switch unit and a second output sub-interface which are sequentially connected in series, and the second output sub-interface is connected with the load;

the second detection branch comprises a second current acquisition unit and a second test unit which are mutually connected, and the second test unit is connected with the second output sub-interface.

Optionally, the current testing device further comprises a detection switch module;

the first detection end of the enabling module is connected with the first common end of the detection switch module, the first end of the detection switch module is connected with the first end of the first test unit, the second end of the detection switch module is connected with the second end of the first test unit, the enabling module is connected with the enabling end of the first power supply switch unit, and the enabling module is configured to output an acquisition enabling signal to the first power supply switch unit when detecting that the voltage at two ends of the first test unit has a pressure difference so as to disconnect the first power supply switch unit;

The second detection end of the enabling module is connected with the second common end of the detection switch module, the third end of the detection switch module is connected with the first end of the second test unit, the fourth end of the detection switch module is connected with the second end of the second test unit, and the enabling module is configured to output an acquisition enabling signal to the second power supply switch unit when detecting that the voltage at two ends of the second test unit has a pressure difference so as to disconnect the second power supply switch unit;

the enabling module is connected with the enabling end of the detection switch module, the detection switch module is configured to be conducted with the first common end of the detection switch module when receiving a first detection enabling signal, and the second common end of the detection switch module is conducted with the third end of the detection switch module; and when receiving a second detection enabling signal, the first common end of the detection switch module is conducted with the second end of the detection switch module, and the second common end of the detection switch module is conducted with the fourth end of the detection switch module.

Optionally, the current testing device further comprises an inverting module;

the second test unit is connected with the detection switch module, and the detection switch module is connected with the enabling module through the phase inversion module.

Optionally, the detection switch module includes a double-pole double-throw switch, a first common of the double-pole double-throw switch is a first common of the detection switch module, a second common of the double-pole double-throw switch is a second common of the detection switch module, a first of the double-pole double-throw switch is a first end of the detection switch module, a second of the double-pole double-throw switch is a second end of the detection switch module, a third of the double-pole double-throw switch is a third end of the detection switch module, and a fourth of the double-pole double-throw switch is a fourth end of the detection switch module;

or the detection switch module comprises a first single-pole double-throw switch and a second single-pole double-throw switch, wherein the public end of the first single-pole double-throw switch is the first public end of the detection switch module, the first end of the first single-pole double-throw switch is the first end of the detection switch module, and the second end of the first single-pole double-throw switch is the second end of the detection switch module; the public end of the second single-pole double-throw switch is the second public end of the detection switch module, the first end of the second single-pole double-throw switch is the third end of the detection switch module, and the second end of the second single-pole double-throw switch is the fourth end of the detection switch module.

Optionally, the first test unit includes a first resistor, a first pole of the first resistor is a first end of the first test unit, and a second pole of the first resistor is a second end of the first test unit;

and/or the second test unit comprises a second resistor, a first pole of the second resistor is a first end of the second test unit, and a second pole of the second resistor is a second end of the second test unit.

According to another aspect of the present utility model, there is provided a display screen testing apparatus, comprising: a power supply device and at least one current testing device according to any embodiment of the present utility model;

the power supply device is connected with the power input interface of the current testing device, the power output interface of the current testing device is connected with the display screen, and the power supply device is configured to supply power to the display screen through the current testing device.

Optionally, the display screen testing device further includes: a screen end interface;

and a power output interface of the current testing device is connected with the display screen through the screen end interface.

According to the technical scheme, when a load is required to be subjected to current test, the current acquisition module is connected with the power input interface, the test module is connected to the power input interface through the current acquisition module, and then pressure difference exists at two ends of the test module; when the enabling module detects that the pressure difference exists at two ends of the testing module, an acquisition enabling signal is output to the power supply switch module, so that the power supply switch module is disconnected, the detection circuit is connected, the current acquisition module is connected with the load in series, the external power supply device supplies power to the load through the detection circuit, and the current acquisition module can acquire the power supply current of the load; therefore, the power supply current of the load is directly tested after the current acquisition module is connected, manual operation is not needed, and the testing efficiency is improved. And the current acquisition module is not fixedly connected with the power input interface, and can be connected only when the power supply current is required to be tested, so that the current acquisition module can be calibrated frequently, and the accuracy of current testing is improved.

It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the utility model or to delineate the scope of the utility model. Other features of the present utility model will become apparent from the description that follows.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic circuit diagram of a current testing device according to an embodiment of the present utility model;

FIG. 2 is a schematic circuit diagram of another current testing apparatus according to an embodiment of the present utility model;

FIG. 3 is a schematic circuit diagram of another current testing apparatus according to an embodiment of the present utility model;

fig. 4 is a schematic circuit diagram of a display screen testing device according to an embodiment of the present utility model;

fig. 5 is a schematic circuit diagram of still another display screen testing apparatus according to an embodiment of the present utility model.

Detailed Description

In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

As mentioned in the background art, when the current test is carried out on the display screen, a resistor of 0 omega is reserved in a power supply circuit of the display screen, and when the test is carried out, the resistor is manually removed, and the universal meters are connected in series, so that the test efficiency is low; the other scheme is that the current acquisition chip is connected in series in advance, but the current acquisition chip is high in cost, and the current acquisition chip cannot be calibrated frequently after long-time use, so that the error is high. Therefore, when the display screen is subjected to current test, the problems of lower efficiency and lower accuracy exist.

Aiming at the technical problems, the embodiment provides a current testing device. Fig. 1 is a schematic circuit diagram of a current testing device according to an embodiment of the present utility model, and referring to fig. 1, the current testing device includes: a power supply circuit 100, a detection circuit 200, and an enable module 301; the power supply circuit 100 comprises a power input interface A1, a power supply switch module 101 and a power output interface A2 which are sequentially connected in series, wherein the power output interface A2 is connected with a load 401, and the power supply circuit 100 is configured to provide power supply voltage for the load 401 through the power output interface A2 when the power supply switch module 101 is conducted; the detection circuit 200 comprises a current collection module 201 and a test module 202 which are connected with each other, the test module 202 is connected with a power output interface A2 of the power supply circuit 100, and the detection circuit 200 is configured to control the disconnection or connection of the power supply switch module 101 according to the connection condition of the current collection module 201 and the power input interface A1, so as to collect the power supply current of the load 401 through the current collection module 201; the enabling module 301 is connected to the testing module 202 and the power supply switch module 101, and the enabling module 301 is configured to output an acquisition enabling signal to the power supply switch module 101 when detecting that a voltage difference exists between two ends of the testing module 202, so that the power supply switch module 101 is disconnected.

The load 401 is, for example, a display screen, the power input interface A1 may be connected to an external power supply device, and the power output interface A2 is connected to the display screen, for example, connected to a power module of the display screen. The external power supply device provides power supply voltage for the display screen through the power supply circuit 100, so that the display screen can work normally; and a signal passage can be arranged to provide image signals for the display screen, so that the real working condition of the display screen is restored, and the accuracy of testing the display screen is improved.

Specifically, when the power supply switch module 101 is turned on, the power supply circuit 100 is turned on, so that the external power supply device supplies power to the load 401 through the power supply circuit 100. When the load 401 needs to be tested for current, the current collection module 201 is connected with the power input interface A1, the test module 202 is connected to the power input interface A1 through the current collection module 201, and a pressure difference exists at two ends of the test module 202. When the enabling module 301 detects that a pressure difference exists at two ends of the testing module 202, an acquisition enabling signal is output to the power supply switch module 101, so that the power supply switch module 101 is disconnected, the detection circuit 200 is connected, the current acquisition module 201 and the load 401 are connected in series, an external power supply device supplies power to the load 401 through the detection circuit 200, the current acquisition module 201 can acquire the power supply current of the load 401, analysis of the power supply current of the load 401 is facilitated, the working state of the power supply module of the display screen is determined according to the power supply current, and therefore the working state of the display screen is analyzed.

Therefore, after the current collection module 201 is connected with the power input interface A1, the enabling module 301 detects that a pressure difference exists at two ends of the test module 202, and outputs a collection enabling signal to the power supply switch module 101, so that the power supply switch module 101 is disconnected, the current collection module 201 is automatically connected with the load 401 in series, the power supply current of the load 401 is directly tested after the current collection module 201 is connected, manual operation is not needed, and the test efficiency is improved. And the current acquisition module 201 is not fixedly connected with the power input interface A1, and only when the power supply current needs to be tested, the current acquisition module 201 is connected in, so that the current acquisition module 201 can be calibrated frequently, and the accuracy of current testing is improved. Fig. 1 illustrates the case where the current acquisition module 201 is connected to the power input interface A1, but is not limited thereto.

The current collection module 201 is, for example, a multimeter, an ammeter, a current sensor, a current transformer, or the like, which is not limited in this embodiment.

For example, a first measuring point B1 may be reserved between the power input interface A1 and the power supply switch module 101, a second measuring point B2 may be reserved at the first end of the test module 202, when the power supply current needs to be tested, two ends of the current collecting module 201 are directly connected to the first measuring point B1 and the second measuring point B2, that is, the current collecting module 201 may be connected to the detection circuit 200, so that the current collecting module 201 may be conveniently and quickly connected to the detection circuit 200, and the efficiency of the current test is further improved.

According to the technical scheme, when a load is required to be subjected to current test, a current acquisition module is connected with a power input interface, the test module is connected to the power input interface through the current acquisition module, and then pressure difference exists at two ends of the test module; when the enabling module detects that the pressure difference exists at two ends of the testing module, an acquisition enabling signal is output to the power supply switch module, so that the power supply switch module is disconnected, the detection circuit is connected, the current acquisition module is connected with the load in series, the external power supply device supplies power to the load through the detection circuit, and the current acquisition module can acquire the power supply current of the load; therefore, the power supply current of the load is directly tested after the current acquisition module is connected, manual operation is not needed, and the testing efficiency is improved. And the current acquisition module is not fixedly connected with the power input interface, and can be connected only when the power supply current is required to be tested, so that the current acquisition module can be calibrated frequently, and the accuracy of current testing is improved.

On the basis of the above technical solution, the enabling module 301 may include a processing unit and a voltage collecting unit, where the voltage collecting unit collects voltages at two ends of the testing module, and the processing unit compares the voltages at two ends of the testing module to determine whether there is a pressure difference at two ends of the testing module; the enabling module 301 may also include a comparator, where two ends of the comparator input voltages at two ends of the test module respectively, and the comparator compares whether a voltage difference exists between two ends of the test module. The specific circuit configuration of the enabling module 301 is described below, but is not a limitation of the present application.

In one implementation, fig. 2 is a schematic circuit diagram of still another current testing device according to an embodiment of the present utility model, optionally, referring to fig. 2, the enabling module 301 includes a processing unit 3011 and a voltage acquisition unit 3012; the voltage acquisition unit 3012 is connected to the test module 202, and the voltage acquisition unit 3012 is configured to acquire a first voltage at a first end of the test module 202 and a second voltage at a second end of the test module 202; the processing unit 3011 is connected to the voltage acquisition unit 3012, the processing unit 3011 is connected to an enable end of the power supply switch module 101, and the processing unit 3011 is configured to output an acquisition enable signal to the power supply switch module 101 when a voltage difference exists between the first voltage and the second voltage, so that the power supply switch module 101 is disconnected.

Specifically, the processing unit 3011 includes, for example, a single-chip microcomputer, where the single-chip microcomputer may be a 51 single-chip microcomputer, for example, an ATM89C51, an AT89C52, or an AT89S51, and the single-chip microcomputer may also be an ARM single-chip microcomputer or a DSP single-chip microcomputer. The voltage acquisition unit 3012 includes, for example, an Analog-to-Digital Converter (ADC). The voltage acquisition unit 3012 acquires a first voltage at a first end of the test module 202, the voltage acquisition unit 3012 acquires a second voltage at a second end of the test module 202, converts the first voltage into a corresponding digital signal and sends the corresponding digital signal to the processing unit 3011, and converts the second voltage into a corresponding digital signal and sends the corresponding digital signal to the processing unit 3011. The processing unit 3011 compares the first voltage with the second voltage, when the processing unit 3011 determines that a voltage difference exists between the first voltage and the second voltage, the determining test module 202 is connected to the power input interface A1 through the current collecting module 201, so that it is determined that the current collecting module 201 is connected to the detecting circuit 200, and the processing unit 3011 outputs a collecting enabling signal to the power supply switch module 101, so that the power supply switch module 101 is disconnected. After the power supply switch module 101 is disconnected, the power input interface A1, the current acquisition module 201, the test module 202, the power output interface A2 and the load 401 are connected in series, and the current acquisition module 201 can acquire the power supply current of the load 401, so that the power supply current of the load 401 can be analyzed conveniently. The acquisition enabling signal may be a low-level signal or a high-level signal, and may specifically be determined according to a signal required for the power supply switch module 101 to be turned off, which is not limited in this embodiment.

In another embodiment, the enabling module 301 optionally includes a comparator; a first input end of the comparator is connected with a first end of the test module 202, a second input end of the comparator is connected with a second end of the test module 202, an output end of the comparator is connected with an enabling end of the power supply switch module 101, and the comparator is configured to output an acquisition enabling signal to the power supply switch module 101 when voltage at two ends of the test module 202 has a differential pressure so as to disconnect the power supply switch module 101.

Specifically, the first end of the comparator may receive the first voltage at the first end of the test module 202, the second end of the comparator may receive the second voltage at the second end of the test module 202, the comparator compares the first voltage with the second voltage, and when the comparator determines that a voltage difference exists between the first voltage and the second voltage, and when a voltage difference exists between two ends of the test module 202, the comparator outputs an acquisition enabling signal to the power supply switch module 101, so that the power supply switch module 101 is disconnected. After the power supply switch module 101 is disconnected, the power input interface A1, the current acquisition module 201, the test module 202, the power output interface A2 and the load 401 are connected in series, and the current acquisition module 201 can acquire the power supply current of the load 401, so that the power supply current of the load 401 can be analyzed conveniently.

The specific circuit configuration of the current testing device is further described below based on the above embodiments, but the present utility model is not limited thereto. Fig. 3 is a schematic circuit diagram of still another current testing apparatus according to an embodiment of the present utility model, optionally, referring to fig. 3, the power supply circuit 100 includes a first power supply branch 110 and a second power supply branch 120, the detection circuit 200 includes a first detection branch 210 and a second detection branch 220, the power supply switch module 101 includes a first power supply switch unit 1011 and a second power supply switch unit 1012, the power input interface A1 includes a first input sub-interface a11 and a second input sub-interface a12, the power output interface A2 includes a first output sub-interface a21 and a second output sub-interface a22, and the current collecting module 201 includes a first current collecting unit 2011 and a second current collecting unit 2012; the test module 202 includes a first test unit 2021 and a second test unit 2022; the first power supply branch 110 includes a first input sub-interface a11, a first power supply switch unit 1011, and a first output sub-interface a21 connected in series in this order, the first output sub-interface a21 being connected to the load 401; the first detection branch 210 includes a first current collecting unit 2011 and a first testing unit 2021 that are connected to each other, where the first testing unit 2021 is connected to the first output sub-interface a 21; the second power supply branch 120 includes a second input sub-interface a12, a second power supply switch unit 1012, and a second output sub-interface a22 sequentially connected in series, and the second output sub-interface a22 is connected to the load 401; the second detection branch 220 comprises a second current acquisition unit 2012 and a second test unit 2022 connected to each other, the second test unit 2022 being connected to the second output sub-interface a 22.

Wherein the first power switching unit 1011 comprises, for example, a single pole single throw switch and the second power switching module 1012 comprises, for example, a single pole single throw switch. The first power supply branch 110 and the second power supply branch 120 may provide different supply voltages for the load 401, e.g. the first power supply branch 110 provides a positive supply voltage for the load 401 and the second power supply branch 110 provides a negative supply voltage for the load 401; alternatively, the first power supply branch 110 provides a negative supply voltage to the load 401 and the second power supply branch 110 provides a positive supply voltage to the load 401. The first current collection unit 2011 is, for example, a multimeter or an ammeter, and may also be a current sensor or a shunt; the second current collecting unit 2012 is, for example, a multimeter or an ammeter, and may be a current sensor or a shunt. By arranging the first detection branch 210 and the second detection branch 220, the power supply current of the positive power supply line and the power supply current of the negative power supply line of the load 401 can be detected, so that the power supply current of the load 401 is comprehensively tested, and the power supply current of the load 401 is conveniently and comprehensively analyzed.

Specifically, when the first power supply switching unit 1011 and the second power supply switching unit 1012 are turned on, the first power supply branch 110 and the second power supply branch 120 supply power to the load 401. When the power supply current of the load 401 needs to be tested, the first current collecting unit 2011 is connected to the first input sub-interface a11, and then the first testing unit 2021 is connected to the first input sub-interface a11 through the first current collecting unit 2011, and then a pressure difference exists across the first testing unit 2021. When the enabling module 301 detects that a voltage difference exists between two ends of the first test unit 2021, an acquisition enabling signal is output to the first power supply switch unit 1011, so that the first power supply switch unit 1011 is disconnected, and therefore the first detection branch 210 is turned on, the first current acquisition unit 2011 is connected in series with the load 401, the external power supply device supplies power to the load 401 through the first detection branch 210, and the first current acquisition unit 2011 can acquire the power supply current of the load 401. Similarly, when the second current collecting unit 2012 is connected to the second input sub-interface a12, the second test unit 2022 is connected to the second input sub-interface a12 through the second current collecting unit 2012, and a pressure difference exists across the second test unit 2022. When the enabling module 301 detects that a voltage difference exists between two ends of the second test unit 2022, an acquisition enabling signal is output to the second power supply switch unit 1012, so that the second power supply switch unit 1012 is disconnected, and accordingly the second detection branch 220 is conducted, the second current acquisition unit 2012 is connected with the load 401 in series, the external power supply device supplies power to the load 401 through the second detection branch 220, and the second current acquisition unit 2012 can acquire the power supply current of the load 401.

Illustratively, the first station B1 includes a first sub-station B11 and a second sub-station B12; the second measuring point B2 comprises a third measuring point B21 and a fourth measuring point B22. A first sub-measuring point B11 is reserved between the first input sub-interface a11 and the first power supply switch unit 1011, a third sub-measuring point B21 is reserved at the first end of the first test unit 2021, when the power supply current needs to be tested, the two ends of the first current collecting unit 2011 are directly connected to the first sub-measuring point B11 and the third sub-measuring point B21, and then the first current collecting unit 2011 can be connected to the first detection branch 210, so that the first current collecting unit 2011 can be conveniently and quickly connected, and the efficiency of current testing is improved. Correspondingly, a second sub-measuring point B12 is reserved between the second input sub-interface a12 and the second power supply switch unit 1012, and a fourth sub-measuring point B22 is reserved at the first end of the second test unit 2022, so that the second current collecting unit 2012 can be conveniently and quickly connected, and the efficiency of current testing is further improved.

Optionally, with continued reference to fig. 3, the current testing apparatus further includes a detection switch module 302; the first detection end of the enabling module 301 is connected to the first common end of the detection switch module 302, the first end of the detection switch module 302 is connected to the first end of the first test unit 2021, the second end of the detection switch module 302 is connected to the second end of the first test unit 2021, the enabling module 301 is connected to the enabling end of the first power supply switch unit 1011, and the enabling module 301 is configured to output an acquisition enabling signal to the first power supply switch unit 1011 to disconnect the first power supply switch unit 1011 when detecting that a voltage difference exists between two ends of the first test unit 2021; the second detection end of the enabling module 301 is connected to the second common end of the detection switch module 302, the third end of the detection switch module 302 is connected to the first end of the second test unit 2022, the fourth end of the detection switch module 302 is connected to the second end of the second test unit 2022, and the enabling module 301 is configured to output an acquisition enabling signal to the second power supply switch unit 1012 to enable the second power supply switch unit 1012 to be disconnected when detecting that a voltage difference exists between two ends of the second test unit 2022; the enabling module 301 is connected to an enabling end of the detecting switch module 302, and when the detecting switch module 302 is configured to receive the first detecting enabling signal, the first common end of the detecting switch module 302 is conducted to the first end thereof, and the second common end of the detecting switch module 302 is conducted to the third end thereof; upon receiving the second detection enable signal, the first common terminal of the detection switch module 302 is turned on with the second terminal thereof, and the second common terminal of the detection switch module 302 is turned on with the fourth terminal thereof.

Specifically, when the enabling module 301 outputs the first detection enabling signal, the first common terminal of the detection switch module 302 is turned on to the first terminal thereof, the second common terminal of the detection switch module 302 is turned on to the third terminal thereof, the enabling module 301 detects the voltage of the first terminal of the first test unit 2021 through the first detection terminal, and detects the voltage of the first terminal of the second test unit 2022 through the second detection terminal; when the enabling module 301 outputs the second detection enabling signal, the first common terminal of the detection switch module 302 is turned on to the second terminal thereof, the second common terminal of the detection switch module 302 is turned on to the fourth terminal thereof, the enabling module 301 detects the voltage of the second terminal of the first test unit 2021 through the first detection terminal, and detects the voltage of the second terminal of the second test unit 2022 through the second detection terminal. Therefore, the enabling module 301 can detect the voltage across one test unit through one detection terminal, thereby saving the ports of the enabling module 301. Also, when the enabling module 301 includes the processing unit 3011 and the voltage collecting unit 3012, the number of the voltage collecting units 3012 can be reduced, which is advantageous in saving costs.

Optionally, with continued reference to fig. 3, the current testing apparatus further includes an inverting module 303; the second test unit 2022 is connected to the detection switch module 302, and the detection switch module 302 is connected to the enable module 301 through the inversion module 303.

Specifically, the inverting module 303 includes, for example, an inverter. The second power supply branch 120 provides a negative supply voltage to the load 401, for example, and the voltage across the second test unit 2022 is a negative voltage, and the negative voltage is converted into a positive voltage by the inverter module 303, so that the enabling module 301 can receive and determine the negative voltage.

As a further embodiment of each of the above embodiments, the detection switch module 302 includes, for example, a double pole double throw switch or two single pole double throw switches in addition to the above embodiments, and the detection switch module 302 is described below, but the present application is not limited thereto.

In one embodiment, optionally, with continued reference to fig. 3, the detection switch module 302 includes a double pole double throw switch 3021, a first common pole of the double pole double throw switch 3021 being a first common pole of the detection switch module 302, a second common pole of the double pole double throw switch 3021 being a second common pole of the detection switch module 302, a first pole of the double pole double throw switch 3021 being a first pole of the detection switch module 302, a second pole of the double pole double throw switch 3021 being a second pole of the detection switch module 302, a third pole of the double pole double throw switch 3021 being a third pole of the detection switch module 302, and a fourth pole of the double pole double throw switch 3021 being a fourth pole of the detection switch module 302.

Specifically, when the detection switch module 302 includes the double-pole double-throw switch 3021, the enabling module 301 may control the first common pole and the second common pole of the double-pole double-throw switch 3021 at the same time, that is, control the first common pole of the double-pole double-throw switch 3021 to be connected to the first pole or the second pole thereof and control the second common pole of the double-pole double-throw switch 3021 to be connected to the third pole or the fourth pole thereof by one detection enable signal, which is convenient to control.

In another embodiment, optionally, the detection switch module 302 includes a first single-pole double-throw switch and a second single-pole double-throw switch, wherein a common pole of the first single-pole double-throw switch is a first common terminal of the detection switch module 302, a first pole of the first single-pole double-throw switch is a first terminal of the detection switch module 302, and a second pole of the first single-pole double-throw switch is a second terminal of the detection switch module 302; the common pole of the second single pole double throw switch is the second common terminal of the detection switch module 302, the first pole of the second single pole double throw switch is the third terminal of the detection switch module 302, and the second pole of the second single pole double throw switch is the fourth terminal of the detection switch module 302.

Specifically, the detection switch module 302 may also include two single pole double throw switches, which are convenient to connect and have low cost. The enabling module 301 can control the first single-pole double-throw switch and the second single-pole double-throw switch simultaneously, and control is convenient.

Optionally, with continued reference to fig. 3, the first test unit 2021 includes a first resistor R1, a first end of the first resistor R1 being a first end of the first test unit 2021, and a second end of the first resistor R1 being a second end of the first test unit 2021; and/or the second test unit 2022 includes a second resistor R2, a first end of the second resistor R2 being a first end of the second test unit 2022, and a second end of the second resistor R2 being a second end of the second test unit 2022.

Specifically, when the first current collecting unit 2011 and the second current collecting unit 2012 are not connected, the first resistor R1 and the second resistor R2 have no voltage drop. When the first current collection unit 2011 is connected to the first input sub-interface a11, the first resistor R1 is connected to the first input sub-interface a11 through the first current collection unit 2011, and then a voltage difference exists between two ends of the first resistor R1; when the enabling module 301 detects that a voltage difference exists between two ends of the first resistor R1, an acquisition enabling signal is output to the first power supply switch unit 1011, so that the first power supply switch unit 1011 is disconnected, the first detection branch 210 is turned on, the first current acquisition unit 2011 is connected with the load 401 in series, the external power supply device supplies power to the load 401 through the first detection branch 210, and the first current acquisition unit 2011 can acquire the power supply current of the load 401. Similarly, after the second current collecting unit 2012 is connected to the second input sub-interface a12, the second resistor R2 is connected to the second input sub-interface a12 through the second current collecting unit 2012, and there is a voltage difference between two ends of the second resistor R2; when the enabling module 301 detects that a voltage difference exists between two ends of the second resistor R2, an acquisition enabling signal is output to the second power supply switch unit 1012, so that the second power supply switch unit 1012 is disconnected, the second detection branch 220 is turned on, the second current acquisition unit 2012 is connected with the load 401 in series, the external power supply device supplies power to the load 401 through the second detection branch 220, and the second current acquisition unit 2012 can acquire the power supply current of the load 401.

Note that, in fig. 3, a case is illustrated in which the first current collection unit 2011 is connected to the first input sub-interface a11, and the second current collection unit 2012 is connected to the second input sub-interface a12, but the present utility model is not limited thereto.

Optionally, with continued reference to fig. 3, the current testing apparatus further includes a third resistor R3 and a fourth resistor R4, the first power supply switching unit 1011 is connected to the first output sub-interface a21 through the third resistor R3, and the second power supply switching unit 1012 is connected to the second output sub-interface a22 through the fourth resistor R4.

Optionally, with continued reference to fig. 3, the inverting module 303 includes an inverter 3031, a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7; the positive input end of the inverter 3031 is grounded through a seventh resistor R7, the negative input end of the inverter 3031 is connected with the second common pole of the double-pole double-throw switch 3021 through a sixth resistor R6, the negative input end of the inverter 3031 is connected with the output end of the inverter 3031 through a fifth resistor R5, and the output end of the inverter 3031 is connected with the second detection end of the enabling module 301.

The embodiment of the utility model also provides a display screen testing device, fig. 4 is a schematic circuit diagram of the display screen testing device provided by the embodiment of the utility model, and referring to fig. 4, the display screen testing device comprises a power supply device 10 and at least one current testing device 20 provided by any embodiment of the utility model; the power supply device 10 is connected with the power input interface A1 of the current testing device 20, the power output interface A2 of the current testing device 20 is connected with the display screen 30, and the power supply device 10 is configured to supply power to the display screen 30 through the current testing device 20.

Specifically, by providing at least one current testing device 20, at least one different power supply voltage may be provided to the display screen 30, for example, a power supply voltage of plus or minus 5V, a power supply voltage of plus or minus 3.3V, and a power supply voltage of plus or minus 12V may be provided, and a plurality of different power supply currents may be tested simultaneously. When the power supply switch module 101 of the current testing device 20 is turned on, the power supply circuit 100 of the current testing device 20 is turned on, and the power supply device 10 supplies power to the display screen 30 through the power supply circuit 100. When the current test is required to be performed on the display screen 30, the current collection module 201 is connected with the power input interface A1 of the current test device 20, the test module 202 of the current test device 20 is connected to the power input interface A1 through the current collection module 201, and then a pressure difference exists at two ends of the test module 202; when the enabling module 301 detects that a pressure difference exists at two ends of the testing module 202, an acquisition enabling signal is output to the power supply switch module 101, so that the power supply switch module 101 is disconnected, the detection circuit 200 is connected, the current acquisition module 201 and the display screen 30 are connected in series, an external power supply device supplies power to the display screen 30 through the detection circuit 200, the current acquisition module 201 can acquire the power supply current of the display screen 30, analysis of the power supply current of the display screen 30 is facilitated, the working state of the power supply module of the display screen 30 is determined according to the power supply current, and therefore the working state of the display screen 30 is analyzed.

Fig. 5 is a schematic circuit diagram of still another display screen testing apparatus according to an embodiment of the present utility model, optionally, referring to fig. 5, the display screen testing apparatus further includes: a screen-end interface 40; the power output interface A2 of the current testing device 20 is connected with the display screen 30 through the screen end interface 40.

Specifically, the type of the screen-end interface 40 may be selected according to the structure of the display screen 30, so that the current testing device 20 may provide the power supply voltage and the image signal for the display screen 30 through the screen-end interface 40, so that the display screen 30 may operate normally, and the detection of the display screen 30 is facilitated.

The above embodiments do not limit the scope of the present utility model. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included in the scope of the present utility model.

Claims (10)

1. A current testing apparatus, comprising: the power supply circuit, the detection circuit and the enabling module;

the power supply circuit comprises a power input interface, a power supply switch module and a power output interface which are sequentially connected in series, wherein the power output interface is connected with a load, and the power supply circuit is configured to provide power supply voltage for the load through the power output interface when the power supply switch module is conducted;

The detection circuit comprises a current acquisition module and a test module which are connected with each other, the test module is connected with the power output interface of the power supply circuit, and the detection circuit is configured to control the disconnection or connection of the power supply switch module according to the connection condition of the current acquisition module and the power input interface so as to acquire the power supply current of the load through the current acquisition module;

the enabling module is respectively connected with the testing module and the power supply switch module, and is configured to output an acquisition enabling signal to the power supply switch module when detecting that the voltage at two ends of the testing module has a pressure difference so as to disconnect the power supply switch module.

2. The current testing device of claim 1, wherein the enabling module comprises a processing unit and a voltage acquisition unit;

the voltage acquisition unit is connected with the test module and is configured to acquire a first voltage at a first end of the test module and a second voltage at a second end of the test module;

the processing unit is connected with the voltage acquisition unit, the processing unit is connected with the enabling end of the power supply switch module, and the processing unit is configured to output an acquisition enabling signal to the power supply switch module when the first voltage and the second voltage have a pressure difference so as to enable the power supply switch module to be disconnected.

3. The current testing device of claim 1, wherein the enabling module comprises a comparator;

the first input end of the comparator is connected with the first end of the test module, the second input end of the comparator is connected with the second end of the test module, the output end of the comparator is connected with the enabling end of the power supply switch module, and the comparator is configured to output a collection enabling signal to the power supply switch module when the voltage at two ends of the test module has a differential pressure so as to disconnect the power supply switch module.

4. A current testing device according to any one of claims 1-3, wherein the power supply circuit comprises a first power supply branch and a second power supply branch, the detection circuit comprises a first detection branch and a second detection branch, the power supply switch module comprises a first power supply switch unit and a second power supply switch unit, the power supply input interface comprises a first input sub-interface and a second input sub-interface, the power supply output interface comprises a first output sub-interface and a second output sub-interface, and the current acquisition module comprises a first current acquisition unit and a second current acquisition unit; the test module comprises a first test unit and a second test unit;

The first power supply branch comprises a first input sub-interface, a first power supply switch unit and a first output sub-interface which are sequentially connected in series, and the first output sub-interface is connected with the load;

the first detection branch comprises the first current acquisition unit and the first test unit which are mutually connected, and the first test unit is connected with the first output sub-interface;

the second power supply branch comprises a second input sub-interface, a second power supply switch unit and a second output sub-interface which are sequentially connected in series, and the second output sub-interface is connected with the load;

the second detection branch comprises a second current acquisition unit and a second test unit which are mutually connected, and the second test unit is connected with the second output sub-interface.

5. The current testing device of claim 4, further comprising a detection switch module;

the first detection end of the enabling module is connected with the first common end of the detection switch module, the first end of the detection switch module is connected with the first end of the first test unit, the second end of the detection switch module is connected with the second end of the first test unit, the enabling module is connected with the enabling end of the first power supply switch unit, and the enabling module is configured to output an acquisition enabling signal to the first power supply switch unit when detecting that the voltage at two ends of the first test unit has a pressure difference so as to disconnect the first power supply switch unit;

The second detection end of the enabling module is connected with the second common end of the detection switch module, the third end of the detection switch module is connected with the first end of the second test unit, the fourth end of the detection switch module is connected with the second end of the second test unit, and the enabling module is configured to output an acquisition enabling signal to the second power supply switch unit when detecting that the voltage at two ends of the second test unit has a pressure difference so as to disconnect the second power supply switch unit;

the enabling module is connected with the enabling end of the detection switch module, the detection switch module is configured to be conducted with the first common end of the detection switch module when receiving a first detection enabling signal, and the second common end of the detection switch module is conducted with the third end of the detection switch module; and when receiving a second detection enabling signal, the first common end of the detection switch module is conducted with the second end of the detection switch module, and the second common end of the detection switch module is conducted with the fourth end of the detection switch module.

6. The current testing device of claim 5, further comprising an inverting module;

the second test unit is connected with the detection switch module, and the detection switch module is connected with the enabling module through the phase inversion module.

7. The current testing device of claim 5, wherein the detection switch module comprises a double pole double throw switch, a first common of the double pole double throw switch being a first common of the detection switch module, a second common of the double pole double throw switch being a second common of the detection switch module, a first of the double pole double throw switch being a first end of the detection switch module, a second of the double pole double throw switch being a second end of the detection switch module, a third of the double pole double throw switch being a third end of the detection switch module, a fourth of the double pole double throw switch being a fourth end of the detection switch module;

or the detection switch module comprises a first single-pole double-throw switch and a second single-pole double-throw switch, wherein the public end of the first single-pole double-throw switch is the first public end of the detection switch module, the first end of the first single-pole double-throw switch is the first end of the detection switch module, and the second end of the first single-pole double-throw switch is the second end of the detection switch module; the public end of the second single-pole double-throw switch is the second public end of the detection switch module, the first end of the second single-pole double-throw switch is the third end of the detection switch module, and the second end of the second single-pole double-throw switch is the fourth end of the detection switch module.

8. The current testing device of claim 4, wherein the first testing unit comprises a first resistor, a first pole of the first resistor being a first end of the first testing unit, a second pole of the first resistor being a second end of the first testing unit;

and/or the second test unit comprises a second resistor, a first pole of the second resistor is a first end of the second test unit, and a second pole of the second resistor is a second end of the second test unit.

9. A display screen testing apparatus, comprising: a power supply device and at least one current testing device according to any one of claims 1-8;

the power supply device is connected with the power input interface of the current testing device, the power output interface of the current testing device is connected with the display screen, and the power supply device is configured to supply power to the display screen through the current testing device.

10. The display screen testing apparatus of claim 9, further comprising: a screen end interface;

and a power output interface of the current testing device is connected with the display screen through the screen end interface.