Electrical wiring detection device for teaching

Abstract

The utility model discloses an electrical wiring detection device for teaching. The electrical wiring detection device comprises a cabinet. A mesh plate; the number of the connecting and inserting positions is 208, and the connecting and inserting positions are arranged on the mesh plate in an array mode; an embedded MCU (Microprogrammed Control Unit), wherein the embedded MCU is used for comparing a circuit formed by the test components; a data interaction unit; the isolated power supply is used for selectively supplying power; the number of the detection lines is 208, one end of each detection line is electrically connected with the plugging position, and the other end of each detection line is selectively and electrically connected with the data interaction unit; a data output unit and a data input unit are arranged between the embedded MCU and the data interaction unit; the bus width is 16 bits; and the data output unit is expanded through 13 pieces of chip selection data from OUTOE1 to OUTOE13 in total. Automatically detecting whether the wiring of the student is correct; various test circuits can be compatible and adapted, the structure is concentrated, and the occupied space is small. And a good man-machine interaction interface is provided, and operation is simple.

Description

Technical Field

[0001] The utility model belongs to the technical field of electronic testing, and in particular relates to an electrical wiring detection device used for teaching. Background Art

[0002] Many current lab units provide individual components, and students are then required to build experimental circuits based on electrical schematics. Due to student inexperience, they may miss or incorrectly connect wires. If power is applied without careful inspection, components or equipment may be damaged, leading to serious safety hazards. If the teacher has to check every connection during the experiment, given the limited time available in a lab class, this will reduce efficiency and hinder the progress of the experiment.

[0003] The Chinese patent document with publication number CN211264734U discloses a three-phase electricity meter line experimental training and assessment device, including a vertical board and an operating table. The vertical board is provided with a circuit diagram mark, and the ends of the circuit diagram mark are provided with wiring terminals. The wiring terminals at the ends of the circuit diagram mark are all in pairs. The inner sides of the wiring terminals are provided with wiring hoses. A current sensor is connected between the wiring hoses inside the two corresponding terminals. The wiring hoses are located in the center of the magnetic field. The outer surface of the wiring hoses is covered with a metal film. Each current sensor is connected to a signal amplifier, and the output end of the signal amplifier is connected to the control end. An automated method is used to detect whether the student's wiring is correct, thereby reducing the workload of the teacher. The electrical equipment is in the form of pictures, which avoids the situation where students make wiring errors and cause circuit short circuits, saving costs and improving efficiency.

[0004] The aforementioned patent solution uses a current sensor pre-installed on the vertical plate to detect component model numbers and determine whether the wiring is correct. However, this approach requires a larger layout to prevent interference between adjacent current sensors. Otherwise, the signals generated by two adjacent components will overlap or interfere with each other, affecting the accuracy of the current sensor. Furthermore, this solution only targets specific circuits and wiring methods, and its applicability is relatively limited. However, in teaching tasks, there are often many different types of circuit wiring methods. If multiple corresponding detection devices are installed, the teaching cost will obviously be too high. Utility Model Content

[0005] In order to overcome the technical problems in the prior art of requiring students to connect independent components to specified circuits according to circuit schematics, which may lead to dangers due to wiring errors and waste teaching time for teachers to check one by one, the present invention aims to provide an electrical wiring detection device for teaching, which comprises a mesh plate with multiple connectors provided on a chassis, and a data exchange unit provided inside the chassis that can communicate with each connector. The embedded MCU compares the connection status of the connectors with the standard electrical schematic to determine whether the components are correctly connected.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: an electrical wiring detection device for teaching, comprising a chassis; a mesh plate, the mesh plate is arranged at the upper end of the chassis; a plug-in position, the plug-in position has 208 and is arranged in an array on the mesh plate, the plug-in position is used to insert and connect the pins of the test components; an embedded MCU, the embedded MCU is arranged in the chassis, the embedded MCU is used to compare the circuit composed of various test components on the mesh plate with the standard circuit; a data interaction unit, the data interaction unit is arranged in the chassis and exchanges data with the embedded MCU; an isolated power supply, the isolated power supply is arranged in the chassis and is connected to the The embedded MCU is electrically connected, and the isolated power supply can optionally supply power to the circuit on the mesh board; the detection circuit, there are 208 detection circuits, one end of each detection circuit is electrically connected to the corresponding connector, and the other end is provided with a relay isolation unit, and the relay isolation unit can be optionally electrically connected to the data interaction unit; wherein, a data output unit and a data input unit are provided between the embedded MCU and the data interaction unit; the bus width of the data output unit and the data input unit are both 16 bits; the data output unit is expanded by 13 chip select data OUT_OE1-OUT_OE13, and scans the wiring status of 16×13=208 connectors.

[0007] Furthermore, the data output unit includes 74HC574 and ULN2803; the data input unit includes 74HC245; the embedded MCU outputs coded data from the PD port according to the set electrical schematic data, and the bit selection data latches the coded data into the 74HC574 and then drives the ULN2803 to output data; the data exchange unit connects the data of the data output unit to the 74HC245 after performing phase AND operation with the corresponding connector, and then inputs the data into the PE port of the embedded MCU; the embedded MCU determines the wiring status through calculation.

[0008] Furthermore, a touch screen for interaction is provided at the front end of the chassis; the touch screen is a serial port screen, which performs serial port communication with the embedded MCU.

[0009] Specifically, the bus of the data output unit outputs 13 16-bit bytes per frame; when detecting the first said plug bit, the embedded MCU outputs 13 bytes in time-sharing mode (0x0001, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000), and the corresponding data input unit will read the corresponding 13 16-bit data; the said plug bit and the remaining 207 said plug bits are respectively and respectively performed with an operation result of 0, indicating that it is connected to the said plug bit, and 1 indicating that it is connected to the said plug bit. No connection; when detecting the second said plug position, the embedded MCU outputs 13 bytes in time-sharing mode, which are (0x0002, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000), and the corresponding said data input unit will read the corresponding 13 16-bit data; the said plug position and the remaining 206 said plug positions are respectively and operated in turn, and the operation result of 0 indicates that it is connected to the said plug position, and 1 indicates that there is no connection; and the detection is repeated until the last said plug position.

[0010] 0 indicates a low output level, and 1 indicates a high output level. The overall idea is to output 208 bits of data each time, with only one bit being 1 and the rest being 0. We want to detect the bit that is 1. Then, after passing through the reverse circuit, the final 208-bit data output has one bit being 0 and the rest being 1s. Then, through the relay contacts, it is connected to the detection point of the actual circuit (signal detection, AND operation, 0 and 0 or 1 AND = 0, 1 and 1 AND = 1), and then returns to the signal input (as long as the detected bit is 0, it is short-circuited with the output bit). After the first bit is detected, the next bit is detected. For example, when detecting the first bit, the output data is 0x0001 (this is hexadecimal, converted to binary it is 0000000000000001B). When detecting the next bit, the output data is 0x0002 (this is hexadecimal, converted to binary it is 00000000000000010B), and so on.

[0011] Specifically, the data output unit outputs only 1 bit 1 each time it scans, and the rest of the bits are 0. After the inversion circuit, the data is 1 bit 0 and the rest of the bits are 1; the data interaction unit ANDs 0 and 1, and if the result is 0, it means that the two points are connected.

[0012] Furthermore, the data output unit controls the scan data Dout0-Dout15 outputted from the PD port of the embedded MCU by OUT_OE and CLK data, and outputs the data through the 74HC574 latch.

[0013] Furthermore, the data input unit inputs the data Din0-Din15 of the data interaction unit into the PE port of the embedded MCU.

[0014] Specifically, the relay isolation unit is an isolation switch between the data exchange unit and the connector; when the relay is closed, the pins of the data exchange unit and the test component are connected; when the relay is disconnected, the pins of the data exchange unit and the test component are disconnected.

[0015] Specifically, the touch screen is used to display the wiring status of each component on the mesh board; the embedded MCU pre-stores standard circuits, which are selected through the touch screen.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. Based on the electrical circuit provided in the experimental instruction manual, the device automatically detects whether the student's wiring is correct, detects whether there are any missing or wrong connections, and displays the wiring status on the touch screen. It can detect circuits with up to 208 points. Only when the wiring results are consistent with the electrical circuit wiring provided in the experimental instruction manual can the power supply for the equipment for experiments and training be turned on. If there are any missing or wrong connections, the equipment cannot be powered on to prevent students from damaging the equipment due to wrong connections.

[0018] 2. It is compatible with a variety of test circuits, and adjacent components will not be interfered with, with high stability. At the same time, the overall structure is centralized, occupies a small space, and is easy to move and store.

[0019] 3. It has a good human-computer interaction interface, which makes the operation simple, prevents safety accidents, greatly protects the safety of the equipment, and saves a lot of use costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is the original diagram frame diagram of the utility model;

[0021] Figure 2 This is a data flow diagram of the present utility model;

[0022] Figure 3 This is a schematic diagram of a data output unit (part) of the present utility model;

[0023] Figure 4 This is a schematic diagram of a relay isolation unit (part) of the present utility model;

[0024] Figure 5 This is a schematic diagram of a data interaction unit (part) of the present utility model;

[0025] Figure 6 This is a schematic diagram of a data input unit (part) of the present utility model;

[0026] Figure 7 This is a schematic diagram of the embedded MCU of the present utility model;

[0027] Figure 8 This is the general principle diagram of the utility model;

[0028] Figure 9 、 Figure 10 This is an embodiment of the component distribution diagram and experimental electrical schematic diagram of the present utility model. DETAILED DESCRIPTION

[0029] Below, the present invention is further described in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0030] In the description of the present invention, it should be noted that, for directional words, such as the terms "center", "horizontal", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and so on, indicating directions and positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific scope of protection of the present invention.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Therefore, the terms "first" and "second" may explicitly or implicitly refer to one or more of these features. In the description of this utility model, "several" means two or more, unless otherwise specifically defined.

[0032] In this utility model, unless otherwise specified or limited, terms such as "disposed" and "installed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection; direct connection, connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0033] See also Figures 1-10 , an electrical wiring detection device for teaching, comprising a chassis; a mesh plate, the mesh plate being arranged at the upper end of the chassis; a connector, the connector having 208 connectors and being arranged in an array on the mesh plate, the connector being used to insert and connect the pins of test components; an embedded MCU, the embedded MCU being arranged in the chassis, the embedded MCU being used to compare the circuit composed of various test components on the mesh plate with the standard circuit; a touch screen, the touch screen being arranged at the front end of the chassis, the touch screen being a serial port screen, and performing serial port communication with the embedded MCU; a data interaction unit, the data interaction unit being arranged in the chassis and performing data exchange with the embedded MCU; an isolated power supply, the isolated power supply being arranged in the chassis and electrically connected to the embedded MCU, the isolated power supply being selectively capable of supplying power to the circuit on the mesh plate; a detection circuit, the detection circuit having 208 connectors, one end of each detection circuit being electrically connected to the corresponding connector, and the other end being provided with a relay isolation unit, the relay isolation unit being selectively electrically connected to the data interaction unit.

[0034] See also Figure 1 A data output unit and a data input unit are provided between the embedded MCU and the data interaction unit; the bus widths of the data output unit and the data input unit are both 16 bits; the data output unit is expanded through 13 chip select data OUT_OE1-OUT_OE13, and scans the wiring conditions of 16×13=208 of the connectors.

[0035] See also Figure 2 、 Figure 3 The data output unit includes 74HC574 and ULN2803; the data input unit includes 74HC245; the embedded MCU outputs coded data from the PD port according to the set electrical schematic data, and the bit selection data latches the coded data into the 74HC574 and then drives the ULN2803 to output data (each scan outputs only 1 bit 1 and the rest of the bits are 0, and after the inversion circuit, the data is 1 bit 0 and the rest of the bits are 1); the data exchange unit connects the data of the data output unit to the 74HC245 through the wiring point of the experimental circuit, that is, the plug-in bit, A1-A8 (connected to the detection point of the experimental circuit), and then connects the data to the 74HC245, and then inputs the data to the PE port of the embedded MCU; the embedded MCU judges the wiring status through calculation.

[0036] The bus of the data output unit outputs 13 16-bit bytes per frame; when detecting the first said plug bit, the embedded MCU outputs 13 bytes in time-sharing mode (0x0001, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000), and the corresponding said data input unit will read the corresponding 13 16-bit data; the said plug bit and the remaining 207 said plug bits are respectively and respectively performed with an operation result of 0, which indicates that it is connected with the said plug bit, and 1 indicates that it is not connected. connection; when detecting the second said plug position, the embedded MCU outputs 13 bytes in a time-sharing manner as (0x0002, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000), and the corresponding said data input unit will read the corresponding 13 16-bit data; the said plug position and the remaining 206 said plug positions are respectively and operated in turn, and the operation result is 0, which indicates that it is connected to the said plug position, and 1 indicates that it is not connected; and the detection is repeated until the last said plug position.

[0037] See also Figure 3 The data output unit controls the scan data Dout0-Dout15 output by the PD port of the embedded MCU by OUT_OE and CLK data, and outputs the data through the 74HC574 latch.

[0038] See also Figure 4 The relay isolation unit is an isolating switch between the data exchange unit and the socket; the relay of the relay isolation unit is only energized and connected to the contact of the experimental circuit when checking the wiring. After the wiring is detected to be correct, the relay of the relay isolation unit is disconnected, and there is no connection between the wiring detection circuit and the experimental circuit.

[0039] The circuit wiring detection mainly consists of a 16-bit data output unit and a 16-bit data input unit. The output unit outputs data in time-sharing and segmented manner (the output data consists of 1 bit 0 and 15 bits 1), and the input unit inputs data and compares it with the preset value to determine whether the wiring is correct.

[0040] See also Figure 6 The data input unit inputs the data Din0-Din15 of the data interaction unit to the PE port of the embedded MCU.

[0041] The data output by the data output unit is connected to the actual plug-in position via the relay isolation unit, and the data is output after an AND operation.

[0042] See also Figure 7 The embedded MCU is a circuit PCB composed of ARM as the core, which is responsible for collecting and processing relevant data and performing serial communication with the touch screen.

[0043] The touch screen adopts a capacitive serial port touch screen, which is simple and sensitive to operate and can achieve good human-computer interaction. In this system, it is mainly responsible for parameter setting, circuit diagram selection, wiring result display, etc. and sends it to the embedded MCU through the serial port for processing.

[0044] See also Figure 9 、 Figure 10 The components used in the experiment have been installed on the mesh board. Each component has several connection points. There are 42 detection points A1-A42 in the figure. These connection points are used for the actual connection of the electrical schematic (such as Figure 9 As shown), and then connected to the contacts of the wiring detection relay isolating the power supply (reference Figure 2 When the system is not powered on, the normally open contacts are connected to the data exchange unit through the relay closure.

[0045] The above description is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by any technician in this field within the scope of the present invention are included in the patent scope of the present invention.

Claims

1. An electrical wiring detection device for teaching, characterized by: Including the box; A mesh plate, the mesh plate being arranged at the upper end of the chassis; Connectors, which have 208 connectors and are arranged in an array on the mesh plate. The connectors are used to insert and connect pins of test components; An embedded MCU is provided in the chassis, and is used to compare a circuit composed of various test components on the mesh board with a standard circuit; A data interaction unit, which is disposed in the chassis and exchanges data with the embedded MCU; An isolated power supply, which is disposed in the chassis and electrically connected to the embedded MCU, and can selectively supply power to the circuit on the mesh board; Detection circuits, there are 208 detection circuits, one end of each detection circuit is electrically connected to the corresponding connector, and the other end is provided with a relay isolation unit, and the relay isolation unit can be selectively electrically connected to the data exchange unit; Among them, a data output unit and a data input unit are arranged between the embedded MCU and the data interaction unit; the bus width of the data output unit and the data input unit are both 16 bits; the data output unit is expanded through 13 chip select data OUT_OE1-OUT_OE13, and scans the wiring conditions of 16×13=208 connectors.

2. The detection device according to claim 1, wherein: The data output unit includes 74HC574 and ULN2803; the data input unit includes 74HC245; the embedded MCU outputs coded data from the PD port according to the set electrical schematic data, and the bit selection data latches the coded data into the 74HC574 and then drives the ULN2803 to output data; the data exchange unit connects the data of the data output unit to the 74HC245 after phase-ANDing through the corresponding connector, and then inputs the data into the PE port of the embedded MCU; The embedded MCU determines the wiring status through calculation.

3. The detection device according to claim 2, wherein: The front end of the chassis is provided with a touch screen for interaction; the touch screen is a serial port screen, which performs serial port communication with the embedded MCU.

4. The detection device according to claim 2, wherein: The bus of the data output unit outputs 13 16-bit bytes per frame; When detecting the first said plug position, the said embedded MCU outputs 13 bytes in time-sharing mode: (0x0001, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000), and the corresponding said data input unit reads the corresponding 13 16-bit data; The said plug position and the other 207 said plug positions are respectively and sequentially performed an AND operation, and the operation result of 0 indicates that it is connected with the said plug position, and 1 indicates that it is not connected; When detecting the second said plug position, the said embedded MCU outputs 13 bytes in time-sharing manner as (0x0002, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000), and the corresponding said data input unit will read the corresponding 13 16-bit data; Performing AND operations on the said plug position and the other 206 said plug positions in sequence, the operation result of 0 indicates that it is connected with the said plug position, and 1 indicates that it is not connected; The detection is repeated in this way until the last plug-in position is reached.

5. The detection device according to claim 4, wherein: The data output unit outputs only 1 bit 1 each time it scans and the rest of the bits are 0. After the inversion circuit, the data is 1 bit 0 and the rest of the bits are 1. The data interaction unit ANDs 0 and 1. If the result is 0, it means that the two points are connected.

6. The detection device according to claim 2, wherein: The data output unit controls the scan data Dout0-Dout15 outputted from the PD port of the embedded MCU by OUT_OE and CLK data, and outputs the data through the 74HC574 latch.

7. The detection device according to claim 2, wherein: The data input unit inputs the data Din0-Din15 of the data interaction unit to the PE port of the embedded MCU.

8. The detection device according to claim 1, wherein: The relay isolation unit is an isolation switch between the data exchange unit and the connector; when the relay is closed, the pins of the data exchange unit and the test component are connected; when the relay is disconnected, the pins of the data exchange unit and the test component are disconnected.

9. The detection device according to claim 3, wherein: The touch screen is used to display the wiring status of each component on the mesh board; the embedded MCU pre-stores standard circuits, which are selected through the touch screen.

Images