CN-115078808-B - Voltage drop detection circuit and voltage drop detection system

CN115078808BCN 115078808 BCN115078808 BCN 115078808BCN-115078808-B

Abstract

The invention discloses a voltage drop detection circuit and a voltage drop detection system. The voltage drop detection circuit comprises a signal receiving module, a PLC control module, an electronic load, a first power module, an interface module and a signal acquisition module, wherein the signal receiving module is used for receiving a set current value, the PLC control module is used for generating a control signal according to the set current value, the electronic load is connected with the PLC control module and is used for adjusting the resistance value according to the control signal, one end of the first power module is connected with the electronic load and is used for providing a first power supply, one end of the interface module is connected with the other end of the first power module, the other end of the interface module is connected with the other end of the electronic load, the interface module is used for connecting a load to be detected, and the signal acquisition module is connected with the interface module and is used for acquiring a voltage signal of the load to be detected. The invention can ensure that the current of the voltage drop detection loop is kept unchanged, thereby simplifying the voltage drop detection flow.

Inventors

XU JIALIANG
WANG XIANSHU

Assignees

深圳市宏之都科技有限公司

Dates

Publication Date: 20260505
Application Date: 20220601

Claims (6)

1. The voltage drop detection circuit is characterized by comprising: the signal receiving module is used for receiving the set current value of the voltage drop detection circuit; The PLC control module is used for generating a control signal according to the set current value; The electronic load is connected with the PLC control module and is used for adjusting the resistance value according to the control signal so as to enable the current of the voltage drop detection loop to be 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; One end of the first power supply module is connected with the electronic load, and the first power supply module is used for providing a first power supply; the interface module is connected with the other end of the first power supply module, the other end of the interface module is connected with the other end of the electronic load, and the interface module is used for connecting the load to be tested; The signal acquisition module is connected with the interface module, the signal acquisition module is used for acquiring a voltage signal of the load to be detected, the signal acquisition module comprises a voltage transmitter and an analog-to-digital conversion module, the voltage transmitter is used for being connected with the interface module, the voltage transmitter is determined based on the signal type of the input voltage signal, the voltage transmitter is used for acquiring the voltage signal and is used for carrying out linear conversion processing on the voltage signal, the analog-to-digital conversion module is connected with the voltage transmitter, and the analog-to-digital conversion module is used for carrying out analog-to-digital conversion processing on the voltage signal after the linear conversion processing.
2. The voltage drop detection circuit of claim 1, wherein the signal acquisition module further comprises: And one end of the photoelectric coupler is connected with the interface module, and the other end of the photoelectric coupler is connected with the voltage transmitter.
3. The voltage drop detection circuit of claim 2, wherein the signal acquisition module comprises: The display is connected with the PLC control module and is used for receiving the set current value.
4. The voltage drop detection circuit of claim 3, wherein 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 from the voltage signal and send the voltage drop value to the display.
5. The voltage drop detection circuit of any one of claims 1 to 4, further comprising: The second power module is connected with the signal acquisition module and used for providing a second power supply.
6. A pressure drop detection system, comprising: A voltage drop detection circuit as claimed in any one of claims 1 to 5; The load to be tested is connected with the interface module and comprises any one of an electric wire to be tested and an electric wire terminal.

Description

Voltage drop detection circuit and voltage drop detection system Technical Field The present disclosure relates to electronic circuits, and particularly to a voltage drop detection circuit and a voltage drop detection system. Background Currently, voltage drop detection is required for devices such as switch contacts, relays, switches, wire harnesses, press-fit terminals, connectors, etc., to determine whether the performance of the corresponding device is normal. In the related art, when voltage drop detection is performed on different types of devices, the current of the detection loop will change along with the type of the device, so that the complexity of voltage drop detection is increased. Disclosure of Invention The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides the voltage drop detection circuit and the voltage drop detection system, which can ensure that the current of the voltage drop detection circuit is kept unchanged, thereby simplifying the voltage drop detection flow. A voltage drop detection circuit according to an embodiment of the first aspect of the present invention includes: the signal receiving module is used for receiving the set current value; The PLC control module is used for generating a control signal according to the set current value; the electronic load is connected with the PLC control module and is used for adjusting the resistance value according to the control signal; One end of the first power supply module is connected with the electronic load, and the first power supply module is used for providing a first power supply; the interface module is connected with the other end of the first power supply module, the other end of the interface module is connected with the other end of the electronic load, and the interface module is used for connecting the load to be tested; The signal acquisition module is connected with the interface module and is used for acquiring the voltage signal of the load to be detected. The voltage drop detection circuit at least has the advantages that the signal receiving module is used for obtaining the set current value sent by a user, the PLC control module is used for receiving the set current value and generating the corresponding control signal, and the electronic load is used for adjusting the resistance value according to the control signal, so that the current of a voltage drop detection loop formed by the electronic load, the first power supply module and the interface module is kept unchanged, and is the set current value, and the detection flow of the voltage drop of the load to be detected is simplified to a certain extent. According to some embodiments of the invention, the signal acquisition module comprises: The voltage transmitter is connected with the interface module and is used for acquiring the voltage signal and performing linear conversion processing on the voltage signal; The analog-to-digital conversion module is connected with the voltage transmitter and is used for carrying out analog-to-digital conversion processing on the voltage signal after the linear conversion processing. According to some embodiments of the invention, the signal acquisition module further comprises: And one end of the photoelectric coupler is connected with the interface module, and the other end of the photoelectric coupler is connected with the voltage transmitter. According to some embodiments of the invention, the signal acquisition module comprises: The display is connected with the PLC control module and is used for receiving the set current value. According to some embodiments of the invention, the signal acquisition module is further configured to connect to the PLC control module, where the PLC control module is configured to obtain a voltage drop value according to the voltage signal, and send the voltage drop value to the display. According to some embodiments of the invention, further comprising: The second power module is connected with the signal acquisition module, and the second voltage module is used for providing a second power supply. According to some embodiments of the invention, the current resolution of the electronic load is 0.001A, and the response speed of the electronic load is 5ms. A pressure drop detection system according to an embodiment of the second aspect of the present invention comprises: a voltage drop detection circuit as claimed in any one of the first aspects; The load to be tested is connected with the interface module and comprises any one of an electric wire to be tested and an electric wire terminal. 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. Drawings The invention is further described with reference to the accompanying drawings and examples, in which: FIG. 1