Voltage drop detection circuit and voltage drop detection system

Abstract

This invention discloses a voltage drop detection circuit and a voltage drop detection system. The voltage drop detection circuit includes: a signal receiving module for receiving a set current value; a PLC control module for generating a control signal based on the set current value; an electronic load connected to the PLC control module, which adjusts its resistance according to the control signal; a first power supply module, one end of which is connected to the electronic load and provides a first power supply; an interface module, one end of which is connected to the other end of the first power supply module and the other end of which is connected to the other end of the electronic load, for connecting the load under test; and a signal acquisition module connected to the interface module, for acquiring the voltage signal of the load under test. This invention ensures that the current in the voltage drop detection circuit remains constant, thereby simplifying the voltage drop detection process.

Description

Technical Field

[0001] This invention relates to the field of electronic circuit technology, and in particular to a voltage drop detection circuit and voltage drop detection system. Background Technology

[0002] Currently, voltage drop testing is required for devices such as switch contacts, relays, switches, wire harnesses, crimp terminals, and connectors to determine whether the corresponding devices are functioning correctly.

[0003] In related technologies, when performing voltage drop detection on different types of equipment, the current in the detection circuit changes with the type of equipment, which increases the complexity of voltage drop detection. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a voltage drop detection circuit and a voltage drop detection system that can ensure that the current in the voltage drop detection circuit remains constant, thereby simplifying the voltage drop detection process.

[0005] A voltage drop detection circuit according to a first aspect of the present invention includes:

[0006] The signal receiving module is used to receive a set current value;

[0007] The PLC control module is used to generate control signals based on the set current value.

[0008] An electronic load is connected to the PLC control module, and the electronic load is used to adjust the resistance value according to the control signal.

[0009] A first power module, one end of which is connected to the electronic load, is used to provide a first power supply.

[0010] An interface module, one end of which is connected to the other end of the first power module, and the other end of which is connected to the other end of the electronic load, the interface module being used to connect to the load under test;

[0011] A signal acquisition module is connected to the interface module and is used to acquire the voltage signal of the load under test.

[0012] The voltage drop detection circuit according to the embodiments of the present invention has at least the following beneficial effects: the signal receiving module obtains the set current value sent by the user, the PLC control module receives the set current value and generates a corresponding control signal, and the electronic load adjusts its own resistance value according to the control signal, thereby ensuring that the current of the voltage drop detection loop formed by the electronic load, the first power supply module and the interface module remains unchanged, and the current is the set current value, thereby simplifying the detection process of the voltage drop of the load under test to a certain extent.

[0013] According to some embodiments of the present invention, the signal acquisition module includes:

[0014] A voltage transmitter is connected to the interface module. The voltage transmitter is used to acquire the voltage signal and to perform linear conversion processing on the voltage signal.

[0015] An analog-to-digital conversion module is connected to the voltage transmitter and is used to perform analog-to-digital conversion on the voltage signal after the linear conversion process.

[0016] According to some embodiments of the present invention, the signal acquisition module further includes:

[0017] An optocoupler, one end of which is connected to the interface module, and the other end of which is connected to the voltage transmitter.

[0018] According to some embodiments of the present invention, the signal acquisition module includes:

[0019] A display, which is connected to the PLC control module, is used to receive the set current value.

[0020] According to some embodiments of the present invention, the signal acquisition module is further configured to connect to the PLC control module; wherein the PLC control module is configured to obtain a voltage drop value based on the voltage signal and send the voltage drop value to the display.

[0021] According to some embodiments of the present invention, it further includes:

[0022] The second power module is connected to the signal acquisition module, and the second voltage module is used to provide a second power supply.

[0023] According to some embodiments of the present invention, the current resolution of the electronic load is 0.001A, and the response speed of the electronic load is 5ms.

[0024] A voltage drop detection system according to a second aspect of the present invention includes:

[0025] The voltage drop detection circuit as described in any of the first aspects;

[0026] The load under test is connected to the interface module, and the load under test includes either the wire under test or the wire terminal.

[0027] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0029] Figure 1 This is a schematic diagram of a module of the voltage drop detection circuit according to an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the ladder diagram of the PLC control module program in an embodiment of the present invention;

[0031] Figure 3 This is another schematic diagram of the ladder diagram of the PLC control module program in an embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of another module of the voltage drop detection circuit in an embodiment of the present invention;

[0033] Figure 5 This is a schematic diagram of a module of the voltage drop detection system according to an embodiment of the present invention.

[0034] Figure label:

[0035] Signal receiving module 100, PLC control module 200, electronic load 300, first power supply module 400, interface module 500, signal acquisition module 600, voltage transmitter 610, analog-to-digital conversion module 620. Detailed Implementation

[0036] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0037] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0038] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0039] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0040] In the description of this invention, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0041] Reference Figure 1 This application provides a voltage drop detection circuit, which includes a signal receiving module 100, a PLC control module 200, an electronic load 300, a first power supply module 400, an interface module 500, and a signal acquisition module 600. The signal receiving module 100 receives a set current value; the PLC control module 200 generates a control signal based on the set current value; the electronic load 300 is connected to the PLC control module 200 and adjusts its resistance according to the control signal; one end of the first power supply module 400 is connected to the electronic load 300 and provides a first power supply; one end of the interface module 500 is connected to the other end of the first power supply module 400, and the other end of the interface module 500 is connected to the other end of the electronic load 300, allowing connection to the load under test; the signal acquisition module 600 is connected to the interface module 500 and acquires the voltage signal of the load under test.

[0042] Specifically, the voltage drop detection circuit provided in this embodiment includes a signal receiving module 100, a PLC control module 200, a voltage drop detection loop, and a signal acquisition module 600. The voltage drop detection loop is formed by connecting an electronic load 300, a first power supply module 400, and an interface module 500 in series. The signal receiving module 100 receives a set current value sent by the user, with an accuracy of 0.001A. The PLC control module 200 generates a corresponding control signal based on the set current value, causing the electronic load 300 to adjust its resistance according to the control signal. This ensures that the current value of the voltage drop detection loop remains constant regardless of which load is connected to the interface module 500, and that the current value of the voltage drop detection loop is the set current value. This avoids the need to measure current to calculate voltage drop in related technologies, thus simplifying the subsequent voltage drop verification process for the load under test. Understandably, the first power supply module 400 is a constant power supply, used to provide the first power supply for the voltage drop detection circuit. The load under test is connected in series with the interface module 500 into the voltage drop detection circuit. The signal acquisition module 600 is connected in parallel with the interface module 500 to acquire the voltage signal of the load under test, which is used to characterize the voltage drop of the load under test.

[0043] Understandably, in order to improve the accuracy of voltage drop detection, a high-precision electronic load 300 can be selected, such as an electronic load 300 with high precision (current resolution of 0.001A), fast response speed (5ms), low power consumption (300W), and stable and reliable (with built-in overvoltage protection, overcurrent protection, overpower protection, and overtemperature protection (≥80℃)).

[0044] Understandably, referring to Figure 2 and Figure 3 This is a partial ladder diagram of the program in the PLC control module 200. After receiving the set current value, the PLC control module 200... Figure 2 , Figure 3 The program shown performs operations such as multiplication and division on the set current value to obtain the corresponding control signal. For example, the PLC control module 200 generates a "5A" current command (i.e., control signal). With the supply voltage of the first power module 400 remaining unchanged, the electronic load 300 adjusts its resistance to ensure that the current returning from the voltage drop detection meets the 5A requirement.

[0045] It is understood that, in the embodiments of this application, the load to be tested includes automotive wiring harnesses, automotive wire terminal riveting joints, etc., and the embodiments of this application do not specifically limit this.

[0046] The voltage drop detection circuit provided in this application embodiment obtains the set current value sent by the user through the signal receiving module 100. The PLC control module 200 receives the set current value and generates a corresponding control signal. The electronic load 300 adjusts its own resistance value according to the control signal, thereby ensuring that the current of the voltage drop detection loop formed by the electronic load 300, the first power supply module 400, and the interface module 500 remains unchanged, and that the current is the set current value, thus simplifying the detection process of the voltage drop of the load under test to a certain extent.

[0047] Reference Figure 4 In some embodiments, the signal acquisition module 600 includes a voltage transmitter 610 and an analog-to-digital converter (ADC) module 620. The voltage transmitter 610 is connected to the interface module 500 and is used to acquire voltage signals and perform linear conversion processing on the voltage signals. The ADC module 620 is connected to the voltage transmitter 610 and is used to perform analog-to-digital conversion processing on the linearly converted voltage signals.

[0048] Specifically, the voltage transmitter 610 is a device that converts measured AC voltage, DC voltage, or pulse voltage into a linearly proportional output DC voltage (or DC current) analog signal. Based on the type of input signal, the voltage transmitter 610 can be categorized as a DC voltage transmitter, an AC voltage transmitter, or an AC / DC dual-purpose voltage transmitter. In this embodiment, the voltage transmitter 610 is taken as a DC voltage transmitter. The voltage transmitter 610 performs linear conversion processing on the input voltage signal to obtain the corresponding analog signal. The voltage transmitter 610 then sends this analog signal to the analog-to-digital converter module 620. The analog-to-digital converter module 620 receives the analog signal and performs analog-to-digital conversion processing on it, converting the analog signal into a digital signal.

[0049] Understandably, in order to improve the accuracy of voltage drop detection, a high-precision voltage transmitter 610 and analog-to-digital converter module 620 can be selected. For example, a voltage transmitter 610 with an accuracy of 0.2% and a response speed of ≤300ms can be selected, as well as an analog-to-digital converter module 620 with 14 bits, an accuracy of 0.8%, and a conversion speed of 20ms.

[0050] In some embodiments, to ensure signal isolation between the voltage transmitter 610 and the load under test and to avoid signal interference, the signal acquisition module 600 further includes an optocoupler. This optocoupler is a linear optocoupler; one end of the optocoupler is connected to the interface module 500, and the other end is connected to the voltage transmitter 610, thereby achieving input isolation for the voltage transmitter 610.

[0051] In some embodiments, the signal acquisition module 600 includes a display connected to the PLC control module 200, the display being used to receive a set current value. Specifically, the signal acquisition module 600 includes a touch-sensitive display to allow the user to directly input a preset current value.

[0052] In some embodiments, the signal acquisition module 600 is further configured to connect to the PLC control module 200, which obtains a voltage drop value based on the voltage signal and sends the voltage drop value to the display. Specifically, the PLC control module 200 is further configured to connect to the analog-to-digital converter module 620, which receives the voltage signal after analog-to-digital conversion by the analog-to-digital converter module 620 and processes the voltage signal to convert it into a voltage drop value for display on the display.

[0053] In some embodiments, the voltage drop detection circuit provided in this application further includes a second power supply module. The second power supply module is connected to the signal acquisition module 600 and is used to provide a second power supply. Specifically, the second power supply module is used to provide a second power supply to the low-voltage module in the voltage drop detection circuit, the low-voltage module including a display, an analog-to-digital converter module 620, a voltage transmitter 610, etc.

[0054] The voltage drop detection circuit provided in this embodiment receives a user-inputted set current value via a display. When the load under test is connected to the interface module 500, the voltage drop value that can be displayed on the display can be obtained based on the PLC control module 200, the voltage drop detection circuit, and the signal acquisition module 600, thereby simplifying the voltage drop detection process for the load under test. Furthermore, by setting a high-precision electronic load 300, voltage transmitter 610, and analog-to-digital converter module 620, the voltage drop detection circuit can meet the detection accuracy requirement of 0.5%.

[0055] Reference Figure 5 This application also provides a voltage drop detection system, which includes a voltage drop detection circuit as described in any of the above embodiments and a load under test. The load under test is connected to an interface module in the voltage drop detection system, and the load under test includes any one of a wire under test or a wire terminal.

[0056] It is evident that the contents of the above-described voltage drop detection circuit embodiments are all applicable to the embodiments of this voltage drop detection system. The specific functions implemented by this voltage drop detection system embodiment are the same as those of the above-described voltage drop detection circuit embodiments, and the beneficial effects achieved are also the same as those achieved by the above-described voltage drop detection circuit embodiments.

[0057] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A voltage drop detection circuit, characterized in that, include: A signal receiving module, wherein the signal receiving module is used to receive the set current value of the voltage drop detection circuit; The PLC control module is used to generate control signals based on the set current value. An electronic load is connected to the PLC control module. The electronic load is used to adjust the resistance value according to the control signal so that the current of the voltage drop detection circuit is kept at the set current value. The current resolution of the electronic load is 0.001A and the response speed of the electronic load is 5ms. A first power module, one end of which is connected to the electronic load, is used to provide a first power supply. An interface module, one end of which is connected to the other end of the first power module, and the other end of which is connected to the other end of the electronic load, the interface module being used to connect to the load under test; A signal acquisition module is connected to the interface module. The signal acquisition module is used to acquire the voltage signal of the load under test. The signal acquisition module includes a voltage transmitter and an analog-to-digital converter module. The voltage transmitter is connected to the interface module and is determined based on the signal type of the input voltage signal. The voltage transmitter is used to acquire the voltage signal and to perform linear conversion processing on the voltage signal. The analog-to-digital converter module is connected to the voltage transmitter and is used to perform analog-to-digital conversion processing on the voltage signal after linear conversion processing.

2. The voltage drop detection circuit according to claim 1, characterized in that, The signal acquisition module also includes: An optocoupler, one end of which is connected to the interface module, and the other end of which is connected to the voltage transmitter.

3. The voltage drop detection circuit according to claim 2, characterized in that, The signal acquisition module includes: A display, which is connected to the PLC control module, is used to receive the set current value.

4. The voltage drop detection circuit according to claim 3, characterized in that, The signal acquisition module is also used to connect to the PLC control module; wherein the PLC control module is used to obtain the voltage drop value based on the voltage signal and send the voltage drop value to the display.

5. The voltage drop detection circuit according to any one of claims 1 to 4, characterized in that, Also includes: The second power module is connected to the signal acquisition module and is used to provide a second power supply.

6. A voltage drop detection system, characterized in that, include: The voltage drop detection circuit as described in any one of claims 1 to 5; The load under test is connected to the interface module, and the load under test includes either the wire under test or the wire terminal.

Images