Laboratory direct current side circuit board capable of being remotely controlled and used for line protection

Abstract

The circuit board comprises a central processor, a power supply module, a DC current acquisition module, a man-machine interaction module, a relay control module, a timing module and a remote interaction module, and can realize local control and remote control of the DC side of the laboratory. Through the central processing unit, monitored abnormal data can be transmitted to the outside through the Ethernet, statistics and tracing are achieved, through the central processing unit, the voltage can be monitored in real time, and if the voltage on the line exceeds a given voltage value and the line is still in a power-on state in preset time, the power-on state is switched off. A signal can be transmitted to the relay control module through the central processing unit, a cut-off signal can be output, a main loop can be cut off, the overall circuit safety of a laboratory is guaranteed, the circuit board is designed, the central processing unit and the modules are integrated, and the modules and the central processing unit are fused through links, so that the overall physical space is reduced, and the cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of laboratory safety, in particular to a circuit board capable of remotely controlling a direct current side of a laboratory for line protection. Background Art

[0002] With the rapid development of the low-voltage electrical appliance testing industry, higher safety requirements have been placed on testing laboratories, and on-off tests and endurance tests are the main sources of business for most laboratories. From a safety perspective, since these tests simulate the ability of various low-voltage electrical products to connect, carry and disconnect circuits under short-circuit faults or extreme life conditions, when the test is conducted without determining whether the test product is a qualified product, there is a certain probability that the circuit will be connected for a long time and other unexpected situations will occur. At the same time, during the test process, if there are no more complete protection measures, it is easy to cause electrical fires and cause production safety accidents.

[0003] However, the circuit protection currently available on the market generally only has accurate current collection or data exchange, but the two are mostly independent, which makes it impossible to achieve data transmission during use, and also increases the risk of signal instability. As a result, the market is in urgent need of a circuit board that is easy to use, has accurate collection and timing, is safe and reliable, and can fully meet the low-voltage electrical appliance detection industry for remote control, data transmission, and can achieve real-time monitoring of port current, and can cut off the main circuit, which is particularly important. Summary of the invention

[0004] In view of the above-mentioned deficiencies, the utility model provides a circuit board which can be used for remote control of the DC side of a laboratory to achieve line protection.

[0005] In order to achieve the above purpose, the utility model adopts a circuit board for line protection that can be remotely controlled on the DC side of the laboratory.

[0006] CPU;

[0007] Power module, used to supply power to the circuit board;

[0008] A DC current acquisition module, including an operational amplifier, is used to acquire the voltage difference between the two ends of the shunt on the external line through the DC current acquisition module, perform real-time monitoring of the change of the current on the external line, and perform amplification processing through the operational amplifier;

[0009] The human-computer interaction module communicates with the central processor through the SPI bus and is used for real-time display of the collected voltage, as well as setting of voltage cut-off and delay time;

[0010] The relay control module is used to execute the output after the signal processing in the circuit board and to cut off the external line in an abnormal state;

[0011] The timing module includes an active crystal oscillator, and is connected to the central processing unit through a clock signal, so as to prevent the central processing unit from causing internal clock confusion due to excessive processing of information, and the active crystal oscillator is used to control the accuracy and stability of the timing;

[0012] The remote interaction module is used for information transmission between the circuit board and the outside world, and performs remote control of the circuit board.

[0013] The utility model is further configured such that the remote interaction module includes an Ethernet controller, a network port transformer, and an Ethernet connector; during the external line working stage, the signal is transmitted into the Ethernet connector through the Ethernet channel, and the signal is enhanced by the network port transformer, and the signal transmission distance is longer. After the enhanced signal enters the Ethernet controller, it communicates with the central processing unit and is transmitted through a separate Ethernet channel, which can be isolated from the outside and enhance the signal's anti-interference.

[0014] Through the above settings, the remote interaction module can achieve reliable signal transmission with the central processor. At the same time, during the signal transmission stage through the Ethernet channel, the Ethernet channel can be used to achieve special transmission and can be isolated from other external signals, thereby achieving reliable anti-interference during the remote interaction process.

[0015] The utility model is further configured that the relay control module includes a transistor output optocoupler, a MOS tube and an inverter, and a switch circuit for use on a circuit board is formed by combining the transistor output optocoupler, the MOS tube and the inverter;

[0016] During the working phase of the external line, the abnormal power-on signal collected by the DC current collection module is output to the relay control module through the pin of the central processing unit, and the external line is cut off through the switching circuit, and is reclosed after the external line problem is solved.

[0017] Through the above, the relay control module involves a transistor output optocoupler, a MOS tube and an inverter, wherein the transistor output optocoupler, the MOS tube and the inverter can form a switch circuit, and the switch circuit can be used to reliably cut off the abnormal power-on state and execute the cutting off of the main circuit; in addition, after the relay control module is directly connected to the central processing unit, when it is used, the central processing unit can send a signal to the inverter, and through the action of the inverter, the drive signal can be increased. When the amplified signal is given from the inverter, it is output to the MOS tube through the transistor output optocoupler, wherein the MOS tube is an ordinary switch, and the main function of the optocoupler is isolation, so that there is no direct electrical connection between the two isolated circuits, and the two sides of the optocoupler connection are the control circuit (central processing unit) on one side and the external high-voltage circuit (relay) on the other side.

[0018] The utility model is further configured such that the human-computer interaction module includes an OLED display and buttons. The line voltage collected by the human-computer interaction module is output through the central processing unit and can be displayed in real time on the display screen. Through the switching and input of the buttons, the abnormal voltage value and time can be set to confirm the monitoring threshold of the external line protection.

[0019] The utility model is further configured such that the power supply module includes a DC-DC module and a linear voltage regulator. Through the cooperation of the DC-DC module and the linear voltage regulator, the DC24V induced in the external circuit is converted into DC5V and DC3.3V, and is used as the power supply for the entire circuit board.

[0020] The utility model is further configured such that the amplification performed by the operational amplifier in the DC current acquisition module is in-phase amplification.

[0021] Through the above arrangement, since in actual work, the circuit board involved in the utility model is used in DC occasions, the direction of the DC is always unchanged, and when measured by an oscilloscope, when the output current exceeds 0V, its waveform is a rectangular wave, which makes it more appropriate to use a co-phase operational amplifier.

[0022] Compared with the prior art, the beneficial effect of the utility model lies in: through the circuit board that can be used for remote control of the laboratory DC side and realize line protection, in actual work, the central processing unit is powered by the power module, and exchanges information with the human-computer interaction module and the remote interaction module, and in the actual working stage, after receiving the abnormal voltage and time setting signal of the human-computer interaction or remote interaction, through the continuous collection of DC voltage, and through the calculation and processing and the action of the timing module, the triggered signal can be finally transmitted back to the relay control module, so that the central processing unit can receive the remote control and the local setting of abnormal voltage and time, and realize the control of the local control and remote operation stages through the central processing unit; in addition, through the action of the central processing unit, the monitored abnormal data can be transmitted to the outside world through Ethernet, which can be used for statistics and tracing.

[0023] Synchronized with the actual working stage, the central processing unit can also be used to monitor the collected voltage in real time to realize the working stage. If the voltage on the line exceeds the given voltage value, and the line is still powered on at the preset time, it will be determined that this is an abnormal power-on situation. The central processing unit will then transmit a signal to the relay control module, output a cut-off signal, and disconnect the main circuit to ensure the safety of the entire laboratory line. At the same time, the design of the circuit board involved in the utility model integrates the central processing unit and multiple modules, and each module is integrated with the central processing unit through a link, which can reduce the overall physical space and save costs. In addition, through the use of the timing module, in order to avoid the central processing unit processing too much information, the computing power is improved, resulting in a decline in heat dissipation performance and causing internal clock confusion, and by introducing an active crystal oscillator, the accuracy and stability of the timing can be reliably improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a block diagram of the working principle of the circuit board of the utility model embodiment;

[0025] Figure 2 This is a schematic diagram of the working principle of the circuit board of the utility model embodiment;

[0026] Figure 3 It is a working effect diagram of the circuit board of the embodiment of the utility model. DETAILED DESCRIPTION

[0027] like Figure 1 As shown, the specific embodiment of the utility model is a circuit board for line protection that can be remotely controlled on the DC side of a laboratory, including

[0028] CPU 1;

[0029] A power module 4, used for supplying power to the circuit board;

[0030] The DC current acquisition module 3 includes an operational amplifier 31, which is used to acquire the voltage difference between the two ends of the shunt a on the external line, perform real-time monitoring of the change of the current on the external line, and perform amplification processing through the operational amplifier 31;

[0031] The human-computer interaction module 2 communicates with the central processor 1 via the SPI bus and is used for real-time display of the collected voltage, as well as setting of the cut-off voltage and delay time;

[0032] The relay control module 7 is used to execute the output of the signal after the circuit board is processed, and to cut off the external line in an abnormal state;

[0033] The timing module 6 includes an active crystal oscillator 61, and is connected to the central processing unit 1 through a clock signal, so as to prevent the central processing unit 1 from causing internal clock confusion due to excessive processing of information, and the active crystal oscillator 61 is used to control the accuracy and stability of the timing;

[0034] The remote interaction module 5 is used for information transmission between the circuit board and the outside world, and performs remote control for the circuit board.

[0035] The above-mentioned remote interaction module 5 includes an Ethernet controller 51, a network port transformer 52, and an Ethernet connector 53; during the external line working stage, the signal is transmitted into the Ethernet connector 53 through the Ethernet channel, and the signal is enhanced by the network port transformer 52, and the signal transmission distance is longer. After the enhanced signal enters the Ethernet controller 51, it communicates with the central processor 1 and is transmitted through a separate Ethernet channel, which can be isolated from the outside and enhance the signal anti-interference.

[0036] The relay control module 7 includes a transistor output optocoupler 72, a MOS tube 73 and an inverter 71, and a switch circuit for use on a circuit board is formed by combining the transistor output optocoupler 72, the MOS tube 73 and the inverter 71;

[0037] During the working stage of the external line, the abnormal power-on signal collected by the DC current collection module 3 is output to the relay control module 7 through the pin of the central processor 1, and the external line is cut off through the switching circuit, and the external line is reclosed after the problem of the external line is solved.

[0038] The above-mentioned human-computer interaction module 2 includes an OLED display 22 and a button 21. The line voltage collected by the human-computer interaction module 2 is output through the central processor 1 and can be displayed in real time on the display screen. By switching and inputting the button 21, the abnormal voltage value and time are set to confirm the monitoring threshold of the external line protection.

[0039] The power supply module 4 includes a DC-DC module 41 and a linear regulator 42. Through the cooperation of the DC-DC module 41 and the linear regulator 42, the DC24V induced in the external line is converted into DC5V and DC3.3V, and used as the power supply for the entire circuit board.

[0040] The operational amplifier 31 in the DC current acquisition module 3 performs in-phase amplification.

[0041] Compared with the prior art, the beneficial effect of the utility model is that: through the circuit board that can be used for remote control of the laboratory DC side and realize line protection, in actual work, the central processing unit 1 is powered by the power module 4, and exchanges information with the human-computer interaction module 2 and the remote interaction module 5, and in the actual working stage, after receiving the abnormal voltage and time setting signal of the human-computer interaction or remote interaction, through the continuous collection of the DC voltage, and after the calculation and processing and the action of the timing module 6, the triggered signal can be finally transmitted back to the relay control module 7, so that the central processing unit 1 can receive the remote control and the local setting of the abnormal voltage and time, and realize the control of the local control and remote operation stages through the central processing unit 1; in addition, through the action of the central processing unit 1, the monitored abnormal data can be transmitted to the outside world through Ethernet, which can be used for statistics and tracing.

[0042] Synchronous to the actual working stage, the central processing unit 1 can also be used to monitor the collected voltage in real time to realize the working stage. If the voltage on the line exceeds the given voltage value, and the line is still powered on at the preset time, it will be determined that this is an abnormal power-on situation, then the central processing unit 1 will transmit a signal to the relay control module 7, output a cut-off signal, disconnect the main circuit, and ensure the safety of the entire laboratory line. At the same time, the design of the circuit board involved in the utility model integrates the central processing unit 1 and multiple modules, and each module is integrated with the central processing unit 1 through a link, which can reduce the overall physical space and save costs. In addition, through the use of the timing module 6, in order to avoid the central processing unit 1 processing too much information, the computing power is improved, resulting in a decline in heat dissipation performance and causing internal clock confusion, and by introducing an active crystal oscillator 61, it is possible to reliably improve the accuracy and stability of the timing.

[0043] like Figure 2 As shown, the working principle of the circuit board of the specific embodiment of the utility model is to convert the induced current signal at both ends of the line shunt a into a voltage signal. The signal passes through the acquisition module of the circuit board, and after being compared with the threshold value set inside the circuit board, a disconnection signal is output to the intermediate relay b in time. The intermediate relay b immediately triggers the core switch universal circuit breaker c on the line, and the circuit board communicates with the external computer d for data transmission.

[0044] like Figure 3 As shown, the specific embodiment of the utility model is to set the circuit board voltage to 600mV, the time to 2s, the DC voltage collected by the circuit board and the reaction waveform of the output transistor; from the DC voltage output waveform, it can be seen that this image simulates the abnormal situation of the sample suddenly burning arc and not disconnecting, and the circuit is still in the power-on state at 2s. As a result, the utility model can well collect the voltage of 600mV until 1.994s, and can output the disconnection signal to cut off the circuit.

Claims

1. A circuit board for line protection that can be remotely controlled on the DC side of a laboratory, characterized in that: include CPU; Power module, used to supply power to the circuit board; A DC current acquisition module, including an operational amplifier, is used to acquire the voltage difference between the two ends of the shunt on the external line through the DC current acquisition module, perform real-time monitoring of the change of the current on the external line, and perform amplification processing through the operational amplifier; The human-computer interaction module communicates with the central processor through the SPI bus and is used for real-time display of the collected voltage, as well as setting of voltage cut-off and delay time; The relay control module is used to execute the output after the signal processing in the circuit board and to cut off the external line in an abnormal state; The timing module includes an active crystal oscillator, and is connected to the central processing unit through a clock signal, so as to prevent the central processing unit from causing internal clock confusion due to excessive processing of information, and the active crystal oscillator is used to control the accuracy and stability of the timing; The remote interaction module is used for information transmission between the circuit board and the outside world, and performs remote control of the circuit board.

2. The circuit board for line protection that can be remotely controlled on the laboratory DC side according to claim 1 is characterized in that: The remote interaction module includes an Ethernet controller, a network port transformer, and an Ethernet connector; During the working stage of the external line, the signal is transmitted into the Ethernet connector through the Ethernet channel, and the signal is enhanced by the network port transformer, which makes the signal transmission distance longer. After the enhanced signal enters the Ethernet controller, it communicates with the central processor and is transmitted through a separate Ethernet channel, which can be isolated from the outside and enhance the signal's anti-interference.

3. The circuit board for line protection that can be remotely controlled on the laboratory DC side according to claim 1 is characterized in that: The relay control module includes a transistor output optocoupler, a MOS tube and an inverter, and a switch circuit for use on a circuit board is formed by combining the transistor output optocoupler, the MOS tube and the inverter; During the working phase of the external line, the abnormal power-on signal collected by the DC current collection module is output to the relay control module through the pin of the central processing unit, and the external line is cut off through the switching circuit, and is reclosed after the external line problem is solved.

4. The circuit board for line protection with remote controllable DC side in the laboratory according to claim 1 is characterized in that: The human-computer interaction module includes an OLED display and buttons. The line voltage collected by the human-computer interaction module is output through the central processing unit and can be displayed in real time on the display screen. By switching and inputting buttons, the abnormal voltage value and time can be set to confirm the monitoring threshold of the external line protection.

5. The circuit board for line protection with remote controllable DC side in the laboratory according to claim 1 is characterized by: The power supply module includes a DC-DC module and a linear regulator. Through the cooperation of the DC-DC module and the linear regulator, the DC24V induced in the external circuit is converted into DC5V and DC3.3V, and is used as the power supply for the entire circuit board.

6. The laboratory DC side remotely controllable circuit board for line protection according to claim 1, characterized in that: The operational amplifier in the DC current acquisition module performs in-phase amplification.

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