Instrument skill training device based on multiple types of variable electrical characteristic parameters

Abstract

The utility model provides an instrument skill training device based on multi-type variable electrical characteristic parameters, which relates to the field of electric service training and comprises an interaction unit, a direct-current power supply unit, an alternating-current power supply unit, a switching control unit and a signal output unit. The signal output unit comprises a plurality of electronic devices; the interaction unit is used for sending a signal generation instruction to the switching control unit; and the switching control unit is used for responding to the signal generation instruction, controlling the direct-current power supply unit or the alternating-current power supply unit to output a power supply signal to the signal output unit, and controlling each electronic device in the signal output unit to be switched on or switched off, so that the signal output unit outputs a signal to be measured. The to-be-measured signal can be flexibly adjusted, the method can be flexibly applied to a scene of instrument skill training for employees, and the training effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of electrical training, and more specifically, to an instrument skills training device based on multiple types of variable electrical characteristic parameters. Background Technology

[0002] In the daily maintenance of electrical equipment, signalmen are required to measure and record the electrical parameters of equipment such as signals, switch machines, track circuits, and choke transformers according to prescribed cycles. Signal electrical characteristic testing is a crucial component of signal maintenance. Currently, the main measuring instruments used in the field include MF14 mechanical multimeters, mechanical megohmmeters, digital multimeters, and track frequency shift testers. These measuring instruments are diverse and relatively complex to operate, posing a challenge for new employees who must undergo training to become proficient in their use.

[0003] In the existing technology, physical training equipment is usually used to train new employees, including signal lights, track circuits and switch machines. These devices bring a lot of convenience to the training work, but they also have shortcomings, such as space limitations, the inability for multiple people to use them at the same time, and the fact that the parameters of the equipment are basically fixed after installation and cannot be flexibly modified. Utility Model Content

[0004] The purpose of this invention is to provide an instrument skills training device based on multiple types of variable electrical characteristic parameters, which can flexibly adjust the measurement signal and can be flexibly applied to scenarios of instrument skills training for employees, thereby improving the training effect.

[0005] This utility model provides a technical solution comprising: an interaction unit, a DC power supply unit, an AC power supply unit, a switching control unit, and a signal output unit; the signal output unit includes multiple electronic components.

[0006] The first output terminal of the interaction unit is connected to the input terminal of the switching control unit, the second output terminal of the interaction unit is connected to the first input terminal of the DC power supply unit, the third output terminal of the interaction unit is connected to the first input terminal of the AC power supply unit, the first output terminal of the switching control unit is connected to the second input terminal of the DC power supply unit, the second output terminal of the switching control unit is connected to the second input terminal of the AC power supply unit, and the third output terminal of the switching control unit is connected to the first input terminal of the signal output unit.

[0007] The second input terminal of the signal output unit is connected to the output terminal of the DC power supply unit and the output terminal of the AC power supply unit. The signal output unit is used to connect to external measuring instruments.

[0008] The interaction unit is used to send signal generation instructions to the switching control unit;

[0009] The switching control unit is used to respond to the signal generation command, control the DC power supply unit or the AC power supply unit to output a power signal to the signal output unit, and control the electronic devices in the signal output unit to be turned on or off, so that the signal output unit outputs the signal to be measured.

[0010] Optionally, the DC power supply unit includes: a DC power supply module and a high voltage module;

[0011] The first end of the DC power module is connected to the second output end of the interactive unit, the second end of the DC power module is connected to the first end of the high voltage module and the second input end of the signal output unit, and the second end of the high voltage module is connected to the first output end of the switching control unit.

[0012] Optionally, the AC power supply unit includes: a signal generation module, a first switching unit, a power amplification module, a second switching unit, a transformer module, and a third switching unit;

[0013] The input terminal of the signal generation module is connected to the output terminal of the interaction unit, the output terminal of the signal generation module is connected to the control terminal of the first switching unit, and the control terminal of the first switching unit is also connected to the second output terminal of the switching control unit.

[0014] The first output terminal of the first switching unit is connected to the input terminal of the power amplifier module, and the second output terminal of the first switching unit is connected to the third input terminal of the signal output unit.

[0015] The output terminal of the power amplifier module is connected to the control terminal of the second switching unit, the control terminal of the second switching unit is also connected to the second output terminal of the switching control unit, the first output terminal of the second switching unit is connected to the input terminal of the transformer module, and the second output terminal of the second switching unit is connected to the third input terminal of the signal output unit.

[0016] The output terminal of the transformer module is connected to the control terminal of the third switch unit. The control terminal of the third switch is also connected to the second output terminal of the switching control unit. The control terminal of the second switch unit is also connected to the second output terminal of the switching control unit. The first output terminal of the second switch unit is connected to the third input terminal of the signal output unit.

[0017] Optionally, the signal output unit includes: a current output module, a voltage output module, and a resistance output module;

[0018] The current output module includes: an AC measurement component, an AC measurement switch, a DC measurement component, and a DC measurement switch;

[0019] The input terminal of the AC measurement component is connected to the output terminal of the DC power supply unit and the output terminal of the AC power supply unit. The output terminal of the AC measurement component is connected to the input terminal of the AC measurement switch. The output terminal of the AC measurement switch is used to output the current signal to be measured. The control terminal of the AC measurement switch is also connected to the third output terminal of the switching control unit.

[0020] The input terminal of the DC measurement component is connected to the output terminal of the DC power supply unit and the output terminal of the AC power supply unit. The output terminal of the DC measurement component is connected to the input terminal of the DC measurement switch. The output terminal of the DC measurement switch is used to output the current signal to be measured. The control terminal of the DC measurement switch is also connected to the third output terminal of the switching control unit.

[0021] The first input terminal of the voltage output module is connected to the output terminal of the DC power supply unit and the output terminal of the AC power supply unit, respectively. The second input terminal of the voltage output module is connected to the third output terminal of the switching control unit. The output terminal of the voltage output module is used to output the voltage signal to be measured.

[0022] The first input terminal of the resistance output module is connected to the output terminal of the DC power supply unit and the output terminal of the AC power supply unit, respectively. The second input terminal of the resistance output module is connected to the third output terminal of the switching control unit. The output terminal of the resistance output module is used to output the resistance signal to be measured.

[0023] Optionally, the voltage output module includes: a first resistor module, a second resistor module, and a capacitor module;

[0024] The first input terminal of the first resistor module is connected to the live wire of the output terminal of the DC power supply unit and the live wire of the output terminal of the AC power supply unit. The second input terminal of the first resistor module is connected to the neutral wire of the output terminal of the DC power supply unit and the neutral wire of the output terminal of the AC power supply unit. The first output terminal of the first resistor module is connected to the first input terminal of the second resistor module. The second output terminal of the first resistor module is connected to the second input terminal of the second resistor module. The third input terminal of the first resistor module is connected to the third output terminal of the switching control unit.

[0025] The first output terminal of the second resistor module is connected to the first input terminal of the capacitor module, the second output terminal of the second resistor module is connected to the second input terminal of the capacitor module, and the third input terminal of the second resistor module is connected to the third output terminal of the switching control unit.

[0026] The first output terminal of the capacitor module is used to output the first ground signal to be measured, and the second output terminal of the capacitor module is used to output the voltage signal to be measured.

[0027] Optionally, the first resistor module includes a first power resistor, a first power switch, a second power resistor, and a second power switch;

[0028] One end of the first power resistor is connected to the live wire of the output terminal of the DC power supply unit and the live wire of the output terminal of the AC power supply unit. The other end of the first power resistor is connected to one end of the first power switch. The other end of the first power switch is connected to the neutral wire of the output terminal of the DC power supply unit and the neutral wire of the output terminal of the AC power supply unit. The control terminal of the first power switch is connected to the third output terminal of the switching control unit.

[0029] One end of the first power resistor is also connected to one end of the second power resistor, the other end of the first power switch is also connected to the other end of the second power switch, the other end of the second power resistor is connected to one end of the second power switch, and the control terminal of the second power switch is connected to the third output terminal of the switching control unit.

[0030] One end of the second power resistor is also connected to the first input terminal of the second resistor module, and the other end of the second power switch is also connected to the second input terminal of the second resistor module.

[0031] Optionally, the second resistor module includes a plurality of online resistors and an online resistor switch corresponding to each of the online resistors;

[0032] One end of the first online resistor is connected to the first output terminal of the first resistor module, the other end of the first online resistor is connected to one end of the first online resistor switch, the other end of the first online resistor switch is connected to the second output terminal of the first resistor module, and the control terminal of the first online resistor switch is also connected to the third output terminal of the switching control unit.

[0033] One end of each online resistor except the first online resistor is connected to one end of the previous online resistor, the other end of each online resistor except the first online resistor is connected to one end of each online resistor switch, the other end of each online resistor switch is connected to the other end of the previous online resistor, and the control terminal of each online resistor switch is connected to the third output terminal of the switching control unit.

[0034] One end of the last online resistor is also connected to the first input terminal of the capacitor module, the other end of the last online resistor is connected to one end of the last online resistor switch, and the control terminal of the last online resistor switch is connected to the third output terminal of the switching control unit.

[0035] Optionally, the capacitor module includes: a plurality of capacitors and a capacitor switch, a third power resistor, a third power switch and a fourth power switch corresponding to each of the capacitors;

[0036] One end of the third power resistor is connected to the first output terminal of the second resistor module and one end of the third power switch. The other end of the third power resistor is connected to one end of each of the capacitors and one end of the fourth power switch. The other end of the third power switch is connected to the other end of the fourth power switch. The other end of the third power switch is also used to output the first ground signal to be measured.

[0037] The other end of each capacitor is connected to one end of each capacitor switch. The other end of the first capacitor switch is connected to the second output terminal of the second resistor module. The other end of each capacitor switch except the last capacitor switch is connected to the other end of the next capacitor switch. The other end of the last capacitor switch is used to output the voltage signal to be measured.

[0038] The control terminals of the third power switch, the fourth power switch, and each of the capacitor switches are also connected to the third output terminal of the switching control unit.

[0039] Optionally, the resistor output module includes: a third resistor module and a fourth resistor module;

[0040] The first end of the third resistor module and the first end of the fourth resistor module are connected to the third output end of the switching control unit. The second end of the third resistor module is used to output the second ground signal to be measured. The third end of the third resistor module is connected to the second end of the fourth resistor module. The fourth end of the third resistor module is connected to the third end of the fourth resistor module. The fourth end of the fourth resistor module is used to output the resistance signal to be measured.

[0041] Optionally, the third resistor module includes: a plurality of DC resistors and a DC resistor switch corresponding to each of the DC resistors;

[0042] The fourth resistor module includes: a plurality of insulating resistors and an insulating resistor switch corresponding to each of the insulating resistors;

[0043] The control terminal of each DC resistance switch is connected to the third output terminal of the switching control unit. One end of the first DC resistor is used to output the second ground signal to be measured. One end of each DC resistor other than the first one is connected to one end of the previous DC resistor. One end of the last DC resistor is also connected to one end of the first insulation resistor.

[0044] The other end of each of the DC resistors is also connected to one end of each of the DC resistor switches. Except for the last one, the other end of each of the DC resistor switches is connected to the other end of the next DC resistor switch. The other end of the last DC resistor switch is connected to the other end of the first insulation resistance switch.

[0045] The control terminal of each insulation resistance switch is connected to the third output terminal of the switching control unit. One end of the first insulation resistance is connected to one end of the last DC resistance, and one end of each insulation resistance except the first one is connected to one end of the previous insulation resistance.

[0046] The other end of each of the insulation resistors is connected to one end of each of the insulation resistor switches. The other end of the first insulation resistor switch is connected to the other end of the last DC resistance switch. Except for the first one, the other end of each of the insulation resistor switches is connected to the other end of the previous insulation resistor switch. The other end of the last insulation resistor switch is also used to output the resistance signal to be measured.

[0047] The beneficial effects of the instrument skills training device based on multiple types of variable electrical characteristic parameters provided by this utility model are as follows: By setting up an interactive unit, a DC power supply unit, an AC power supply unit, a switching control unit, and a signal output unit in the instrument skills training device based on multiple types of variable electrical characteristic parameters, and setting multiple electronic devices in the signal output unit, the interactive unit can send a signal generation command to the switching control unit. This allows the switching control unit to respond to the signal generation command, control the DC power supply unit or the AC power supply unit to output a power signal to the signal output unit, and control the on / off state of each electronic device in the signal output unit so that the signal output unit outputs the signal to be measured. Therefore, the instrument skills training device based on multiple types of variable electrical characteristic parameters provided by this utility model can flexibly adjust the signal to be measured and can be flexibly applied to scenarios of instrument skills training for employees, thereby improving the training effect. Attached Figure Description

[0048] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 This is a schematic diagram of the appearance of an instrument skills training device based on multiple types of variable electrical characteristic parameters provided in this embodiment;

[0050] Figure 2 A schematic diagram of a structure for an instrument skills training device based on multiple types of variable electrical characteristic parameters provided by this utility model;

[0051] Figure 3 A schematic diagram of the DC power supply unit in the instrument skills training device based on multiple types of variable electrical characteristic parameters provided by this utility model;

[0052] Figure 4 A schematic diagram of the AC power supply unit in the instrument skills training device based on multiple types of variable electrical characteristic parameters provided by this utility model;

[0053] Figure 5 A schematic diagram of the signal output unit in the instrument skills training device based on multiple types of variable electrical characteristic parameters provided by this utility model;

[0054] Figure 6 A schematic diagram of the voltage output module in the instrument skills training device based on multiple types of variable electrical characteristic parameters provided by this utility model;

[0055] Figure 7 A schematic diagram of the structure of the first resistor module in the instrument skills training device based on multiple types of variable electrical characteristic parameters provided by this utility model;

[0056] Figure 8 A schematic diagram of the structure of the second resistor module in the instrument skills training device based on multiple types of variable electrical characteristic parameters provided by this utility model;

[0057] Figure 9 A schematic diagram of the capacitor module in the instrument skills training device based on multiple types of variable electrical characteristic parameters provided by this utility model;

[0058] Figure 10 A schematic diagram of the resistance output module in the instrument skills training device based on multiple types of variable electrical characteristic parameters provided by this utility model;

[0059] Figure 11 Another structural schematic diagram of the resistance output module in the instrument skills training device based on multiple types of variable electrical characteristic parameters provided by this utility model;

[0060] Figure 12 This is another structural schematic diagram of the instrument skills training device based on multiple types of variable electrical characteristic parameters provided by this utility model. Detailed Implementation

[0061] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0062] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0063] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0064] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0065] Furthermore, the terms "first," "second," and "third" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0066] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0067] In the existing technology, physical training equipment is usually used to train new employees, including signal lights, track circuits and switch machines. These devices bring a lot of convenience to the training work, but they also have shortcomings, such as space limitations, the inability for multiple people to use them at the same time, and the fact that the parameters of the equipment are basically fixed after installation and cannot be flexibly modified.

[0068] To address the aforementioned problems, this invention provides an instrument skills training device based on multiple types of variable electrical characteristic parameters. By incorporating an interactive unit, a DC power supply unit, an AC power supply unit, a switching control unit, and a signal output unit, and by setting multiple electronic components within the signal output unit, the device enables the interactive unit to send signal generation commands to the switching control unit. The switching control unit then responds to these commands, controlling the DC or AC power supply unit to output power signals to the signal output unit, and controlling the on / off states of the electronic components within the signal output unit to output the measured signal. This allows the instrument skills training device to flexibly adjust the measured signal, making it suitable for various scenarios involving instrument skills training for employees and improving training effectiveness.

[0069] Please see Figure 1 , Figure 1 This is a schematic diagram of the appearance of an instrument skills training device based on multiple types of variable electrical characteristic parameters provided in this embodiment, with reference to... Figure 1 As shown, the instrument skills training device based on multiple types of variable electrical characteristic parameters provided in this embodiment can provide an interactive interface to the user through the interactive unit, so that the user can input training information on the interactive interface. The training information is used to indicate the electrical characteristics of the measured signal output by the instrument skills training device based on multiple types of variable electrical characteristic parameters provided in this embodiment through the signal output unit.

[0070] Specifically, the interactive unit can be pre-set with standard values ​​of electrical characteristic parameters for railway signaling equipment such as signal lights, track circuits, and switch machines, so that users can select the corresponding measurement items in the interactive interface according to their training needs. For example, the interactive interface can display options such as selecting standard electrical characteristic parameter values ​​for on-site signal lights, track circuits, and turnouts.

[0071] Specifically, the signal to be measured may include at least one of the following types: frequency shift voltage and frequency shift current values, pole impedance and zero impedance, carrier frequency and frequency shift frequency of track circuits, primary side voltage, secondary side voltage and rail surface voltage of track circuits, input and output voltage values ​​of the lighting unit of the signal, lamp terminal voltage value and lamp current, operating current and fault current of the switch machine; motor resistance of the switch machine and compensation capacitor value of the track circuit.

[0072] Understandable, continue to refer to Figure 1 As shown, after the instrument skill training device based on multiple types of variable electrical characteristic parameters provided in this embodiment outputs the signal to be measured through the signal output unit, the user can use an external measuring instrument (not shown in the figure) to measure the signal to be measured. The measuring instrument can be electrically connected to the instrument skill training device based on multiple types of variable electrical characteristic parameters provided in this embodiment, so that the instrument skill training device based on multiple types of variable electrical characteristic parameters provided in this embodiment can collect the target signal of the measuring instrument through the interactive unit and compare it with the training information, thereby determining whether the user's measurement result meets the standard, that is, assessing the learning results of the trainees.

[0073] The instrument skills training device based on multiple types of variable electrical characteristic parameters provided by this utility model will be described in detail below with reference to several embodiments.

[0074] Figure 2 This is a schematic diagram of a structure for an instrument skills training device based on multiple types of variable electrical characteristic parameters provided by this utility model, with reference to... Figure 2 As shown, the instrument skills training device based on multiple types of variable electrical characteristic parameters provided by this utility model includes: an interactive unit, a DC power supply unit, an AC power supply unit, a switching control unit, and a signal output unit.

[0075] Optionally, the interaction unit can be a control host for interacting with the DC power supply unit, the AC power supply unit, and the switching control unit.

[0076] The signal output unit includes multiple electronic components.

[0077] Alternatively, the electronic device may include resistors and capacitors.

[0078] The first output terminal of the interactive unit is connected to the input terminal of the switching control unit, the second output terminal of the interactive unit is connected to the first input terminal of the DC power supply unit, the third output terminal of the interactive unit is connected to the first input terminal of the AC power supply unit, the first output terminal of the switching control unit is connected to the second input terminal of the DC power supply unit, the second output terminal of the switching control unit is connected to the second input terminal of the AC power supply unit, and the third output terminal of the switching control unit is connected to the first input terminal of the signal output unit.

[0079] Optionally, the interaction unit can be connected to the DC power supply unit, the AC power supply unit, and the switching control unit via a USB-to-serial interface. The switching control unit is electrically connected to the DC power supply unit and the AC power supply unit.

[0080] The second input terminal of the signal output unit is connected to the output terminal of the DC power supply unit and the output terminal of the AC power supply unit. The signal output unit is used to connect to external measuring instruments.

[0081] Optionally, the first input terminal of the interactive unit, i.e. the aforementioned interactive interface, is used to receive training information input by the user, so that the interactive unit can generate signal generation instructions based on the training information after receiving the training information.

[0082] Optionally, the interaction unit is used to send signal generation instructions to the switching control unit. At the same time, the interaction unit is also used to send power instructions to the DC power supply unit or the AC power supply unit, so that the AC power supply unit can output waveforms of different frequencies and voltages to the signal output unit, or so that the DC power supply unit can output voltages and currents of different amplitudes to the signal output unit.

[0083] The switching control unit may include multiple relays. Signal generation instructions are used to instruct the switching control unit to turn on and off each relay, so as to control the outputs of the DC power supply unit, AC power supply unit and signal output unit respectively through the on and off of each relay.

[0084] Among them, the power supply command is used to indicate the characteristics of the electrical energy output by the AC power supply unit or the DC power supply unit.

[0085] The switching control unit is used to respond to signal generation commands, control the DC power supply unit or AC power supply unit to output power signals to the signal output unit, and control the electronic devices in the signal output unit to be turned on or off, so that the signal output unit outputs the signal to be measured.

[0086] Optionally, the interactive unit sends a power supply command to the DC power supply unit or the AC power supply unit, so that the DC power supply unit or the AC power supply unit can output electrical energy to the signal output unit in a specified manner. At the same time, the process of the DC power supply unit or the AC power supply unit outputting specified electrical energy to the signal output unit is also controlled by the switching control unit. The switching control unit is used to control the DC power supply unit or the AC power supply unit to output a power signal to the signal output unit under the action of the signal generation command, and to control the electronic devices in the signal output unit to be turned on or off, so that the signal output unit outputs the signal to be measured.

[0087] Optionally, the second input terminal of the interactive unit can also be connected to an external measuring instrument. The interactive unit is also used to receive the target signal measured by the user through the external measuring instrument. After receiving the target signal, the interactive unit can compare it with the training information to determine whether the user's measurement result meets the standard, that is, to assess the student's learning results and output the assessment results to the user.

[0088] In this embodiment, by setting up an interactive unit, a DC power supply unit, an AC power supply unit, a switching control unit, and a signal output unit in the instrument skills training device based on multiple types of variable electrical characteristic parameters, and by setting up multiple electronic devices in the signal output unit, a signal generation command can be sent to the switching control unit through the interactive unit. This allows the switching control unit to respond to the signal generation command, controlling the DC power supply unit or the AC power supply unit to output a power signal to the signal output unit, and controlling the on / off state of each electronic device in the signal output unit, so that the signal output unit outputs the signal to be measured. Therefore, the instrument skills training device based on multiple types of variable electrical characteristic parameters provided by this invention can flexibly adjust the signal to be measured, and can be flexibly applied to scenarios of instrument skills training for employees, thereby improving the training effect.

[0089] Figure 3 A schematic diagram of a DC power supply unit in an instrument skills training device based on multiple types of variable electrical characteristic parameters provided by this utility model.

[0090] In one possible implementation, refer to Figure 3 As shown, in Figure 2 Based on this, the DC power supply unit includes: a DC power supply module and a high voltage module.

[0091] The first end of the DC power supply module is connected to the second output end of the interactive unit, the second end of the DC power supply module is connected to the first end of the high voltage module and the second input end of the signal output unit, and the second end of the high voltage module is connected to the first output end of the switching control unit.

[0092] Optionally, the DC power supply module may include a DC flow-controlled power supply, which can output voltage and current of different amplitudes under the control of the interactive unit.

[0093] Optionally, a high-voltage module is used to achieve high-voltage output.

[0094] By setting up a DC power supply module and a high-voltage module in the DC power supply unit, the DC power supply module and the high-voltage module can output the voltage and current indicated by the power supply command, so that the DC power supply unit can output different voltages and currents, which improves the flexibility and adjustability of the instrument skills training device based on multiple types of variable electrical characteristic parameters.

[0095] Figure 4 A schematic diagram of an AC power supply unit in an instrument skills training device based on multiple types of variable electrical characteristic parameters provided by this utility model.

[0096] In one possible implementation, refer to Figure 4 As shown, in Figure 2 Based on this, the AC power supply unit includes: a signal generation module, a first switching unit, a power amplification module, a second switching unit, a transformer module, and a third switching unit.

[0097] The input terminal of the signal generation module is connected to the output terminal of the interaction unit, the output terminal of the signal generation module is connected to the control terminal of the first switching unit, the control terminal of the first switching unit is also connected to the second output terminal of the switching control unit, the first output terminal of the first switching unit is connected to the input terminal of the power amplifier module, and the second output terminal of the first switching unit is connected to the third input terminal of the signal output unit.

[0098] Optionally, the signal generation module may include a signal amplifier, and the control terminal of the first switching unit is used to receive the power command from the interaction unit and the control command from the switching control unit, and is connected to the first output terminal or the second output terminal of the first switching unit under the action of the power command and the control command.

[0099] The first switching unit can be a three-position toggle switch or a three-pole push-button switch. The power command is used to indicate the characteristics of the electrical energy output by the AC power unit or the DC power unit. The control command is used to indicate the on and off terminals of the first switching unit to control whether the electrical energy output by the signal generation module is directly output to the signal output unit. Specifically, if yes, the control terminal of the first switching unit is connected to the second output terminal; if no, the control terminal of the first switching unit is connected to the first output terminal.

[0100] The output terminal of the power amplifier module is connected to the control terminal of the second switching unit. The control terminal of the second switching unit is also connected to the second output terminal of the switching control unit. The first output terminal of the second switching unit is connected to the input terminal of the transformer module. The second output terminal of the second switching unit is connected to the third input terminal of the signal output unit.

[0101] Optionally, the power amplification module may include a power amplifier, and the control terminal of the second switching unit is used to receive the power command from the interaction unit and the control command from the switching control unit output by the signal generation module, and to conduct to the first output terminal or the second output terminal of the second switching unit under the action of the power command and the control command.

[0102] The second switching unit can be a three-position toggle switch or a three-pole push-button switch. The power command is used to indicate the characteristics of the electrical energy output by the AC power unit or the DC power unit. The control command is used to indicate the on and off terminals of the second switching unit to control whether the electrical energy output by the power amplifier module is directly output to the signal output unit. Specifically, if yes, the control terminal of the second switching unit is connected to the second output terminal; if no, the control terminal of the second switching unit is connected to the first output terminal.

[0103] The output terminal of the transformer module is connected to the control terminal of the third switch unit. The control terminal of the third switch is also connected to the second output terminal of the switching control unit. The control terminal of the second switch unit is also connected to the second output terminal of the switching control unit. The first output terminal of the second switch unit is connected to the third input terminal of the signal output unit.

[0104] Optionally, the transformer module may include a transformer, and the control terminal of the third switching unit is used to receive power commands from the interaction unit and control commands from the switching control unit output by the power amplifier module, and to conduct to the first output terminal of the third switching unit under the action of the power commands and control commands.

[0105] The third switching unit can be a three-position toggle switch or a three-pole push-button switch. The power command is used to indicate the characteristics of the electrical energy output by the AC power unit or the DC power unit. The control command is used to indicate whether the third switching unit is turned on or off, so as to control whether the electrical energy output by the transformer module is output to the signal output unit.

[0106] By setting a signal generation module, a first switching unit, a power amplification module, a second switching unit, a transformer module, and a third switching unit in the AC power supply unit, the voltage and current indicated by the power supply command can be output through at least one of the signal generation module, the power amplification module, and the transformer module. This enables the AC power supply unit to output voltages and currents of different magnitudes, improving the flexibility and adjustability of the instrument skills training device based on multiple types of variable electrical characteristic parameters.

[0107] Figure 5 This is a schematic diagram of the signal output unit in the instrument skills training device based on multiple types of variable electrical characteristic parameters provided by this utility model.

[0108] In one possible implementation, refer to Figure 5 As shown, in Figure 2 Based on this, the signal output unit includes: a current output module, a voltage output module, and a resistance output module.

[0109] The current output module includes: an AC measurement component, an AC measurement switch, a DC measurement component, and a DC measurement switch.

[0110] The input terminal of the AC measurement component is connected to the output terminal of the DC power supply unit and the output terminal of the AC power supply unit. The output terminal of the AC measurement component is connected to the input terminal of the AC measurement switch. The output terminal of the AC measurement switch is used to output the current signal to be measured. The control terminal of the AC measurement switch is also connected to the third output terminal of the switching control unit.

[0111] Optionally, the AC measurement component can be an AC clamp for implementing single-frequency detection and frequency-shift detection functions.

[0112] The input terminal of the DC measurement component is connected to the output terminal of the DC power supply unit and the output terminal of the AC power supply unit. The output terminal of the DC measurement component is connected to the input terminal of the DC measurement switch. The output terminal of the DC measurement switch is used to output the current signal to be measured. The control terminal of the DC measurement switch is also connected to the third output terminal of the switching control unit.

[0113] Optionally, the DC measurement component can be a DC clamp for realizing DC current measurement.

[0114] Optionally, the DC measurement component and the AC measurement component can also be directly connected to the voltage output module to output a current signal while simultaneously outputting a voltage signal.

[0115] The first input terminal of the voltage output module is connected to the output terminal of the DC power supply unit and the output terminal of the AC power supply unit, respectively. The second input terminal of the voltage output module is connected to the third output terminal of the switching control unit. The output terminal of the voltage output module is used to output the voltage signal to be measured.

[0116] The first input terminal of the resistance output module is connected to the output terminal of the DC power supply unit and the output terminal of the AC power supply unit, respectively. The second input terminal of the resistance output module is connected to the third output terminal of the switching control unit. The output terminal of the resistance output module is used to output the resistance signal to be measured.

[0117] Optionally, the voltage output module may include a high-voltage DC output circuit, an online impedance switching circuit, and a compensation capacitor switching circuit to realize high-voltage current output, online impedance level switching, and compensation capacitor level switching.

[0118] Optionally, the resistance output module may include a DC resistance switching circuit and an insulation resistance switching circuit to realize the switching of insulation resistance and DC resistance levels.

[0119] By incorporating current output, voltage output, and resistance output modules into the signal output unit, the measured signal can be flexibly adjusted, making it suitable for use in employee training scenarios and improving training effectiveness.

[0120] Figure 6 This is a schematic diagram of the voltage output module in the instrument skills training device based on multiple types of variable electrical characteristic parameters provided by this utility model.

[0121] In one possible implementation, refer to Figure 6 As shown, the voltage output module includes: a first resistor module, a second resistor module, and a capacitor module.

[0122] The first input terminal of the first resistor module is connected to the live wire of the output terminal of the DC power supply unit and the live wire of the output terminal of the AC power supply unit. The second input terminal of the first resistor module is connected to the neutral wire of the output terminal of the DC power supply unit and the neutral wire of the output terminal of the AC power supply unit. The first output terminal of the first resistor module is connected to the first input terminal of the second resistor module. The second output terminal of the first resistor module is connected to the second input terminal of the second resistor module. The third input terminal of the first resistor module is connected to the third output terminal of the switching control unit.

[0123] Optionally, the first resistor module may include multiple power resistors and multiple switches, enabling power regulation, current control, voltage limiting, and heat dissipation.

[0124] The first output terminal of the second resistor module is connected to the first input terminal of the capacitor module, the second output terminal of the second resistor module is connected to the second input terminal of the capacitor module, and the third input terminal of the second resistor module is connected to the third output terminal of the switching control unit.

[0125] Optionally, the second resistor module may include multiple online resistors and multiple switches, which can perform current limiting protection, voltage division, filtering and anti-interference, and impedance matching.

[0126] The first output terminal of the capacitor module is used to output the first ground signal to be measured, and the second output terminal of the capacitor module is used to output the voltage signal to be measured.

[0127] Optionally, the capacitor module may include multiple capacitors and switches, enabling filtering, energy storage, and decoupling.

[0128] Optionally, the switching control unit can select the closed resistors and capacitors in the first resistor module, the second resistor module, and the capacitor module to output different voltage signals to be measured.

[0129] Figure 7 A schematic diagram of the first resistor module in the instrument skills training device based on multiple types of variable electrical characteristic parameters provided by this utility model.

[0130] In one possible implementation, refer to Figure 7 As shown, in Figure 6 Based on this, the first resistor module includes: a first power resistor, a first power switch, a second power resistor, and a second power switch.

[0131] One end of the first power resistor is connected to the live wire of the output terminal of the DC power supply unit and the live wire of the output terminal of the AC power supply unit. The other end of the first power resistor is connected to one end of the first power switch. The other end of the first power switch is connected to the neutral wire of the output terminal of the DC power supply unit and the neutral wire of the output terminal of the AC power supply unit. The control terminal of the first power switch is connected to the third output terminal of the switching control unit.

[0132] One end of the first power resistor is also connected to one end of the second power resistor, the other end of the first power switch is also connected to the other end of the second power switch, the other end of the second power resistor is connected to one end of the second power switch, the control terminal of the second power switch is connected to the third output terminal of the switching control unit, one end of the second power resistor is also connected to the first input terminal of the second resistor module, and the other end of the second power switch is also connected to the second input terminal of the second resistor module.

[0133] Optionally, both the first power resistor and the second power resistor can be 10R power resistors, which can perform power regulation, current control, voltage limiting and heat dissipation. The first power switch can be a reverse DC control switch, and the second power switch can be a push-button switch or other switch relay.

[0134] Figure 8A schematic diagram of the structure of the second resistor module in the instrument skills training device based on multiple types of variable electrical characteristic parameters provided by this utility model.

[0135] In one possible implementation, refer to Figure 8 As shown, in Figure 6 Based on this, the second resistor module includes multiple online resistors and online resistor switches that correspond one-to-one with each online resistor.

[0136] One end of the first online resistor is connected to the first output terminal of the first resistor module, the other end of the first online resistor is connected to one end of the first online resistor switch, the other end of the first online resistor switch is connected to the second output terminal of the first resistor module, and the control terminal of the first online resistor switch is also connected to the third output terminal of the switching control unit.

[0137] Except for the first online resistor, one end of each online resistor is connected to one end of the previous online resistor, and the other end of each online resistor is connected to one end of each online resistor switch. The other end of each online resistor switch is connected to the other end of the previous online resistor, and the control terminal of each online resistor switch is connected to the third output terminal of the switching control unit.

[0138] One end of the last online resistor is also connected to the first input terminal of the capacitor module, the other end of the last online resistor is connected to one end of the last online resistor switch, and the control terminal of the last online resistor switch is connected to the third output terminal of the switching control unit.

[0139] For example, Figure 8 The example is illustrated using two online resistors and two corresponding online resistor switches. Each online resistor is used for current limiting protection, voltage division, filtering and anti-interference, and impedance matching.

[0140] Figure 9 This is a schematic diagram of a capacitor module in an instrument skills training device based on multiple types of variable electrical characteristic parameters provided by this utility model.

[0141] In one possible implementation, refer to Figure 9 As shown, in Figure 6 Based on this, the capacitor module includes: multiple capacitors and capacitor switches corresponding to each capacitor, a third power resistor, a third power switch, and a fourth power switch.

[0142] One end of the third power resistor is connected to the first output terminal of the second resistor module and one end of the third power switch. The other end of the third power resistor is connected to one end of each capacitor and one end of the fourth power switch. The other end of the third power switch is connected to the other end of the fourth power switch. The other end of the third power switch is also used to output the first ground signal to be measured.

[0143] The other end of each capacitor is connected to one end of each capacitor switch. The other end of the first capacitor switch is connected to the second output terminal of the second resistor module. The other end of each capacitor switch except the last one is connected to the other end of the next capacitor switch. The other end of the last capacitor switch is used to output the voltage signal to be measured.

[0144] The control terminals of the third power switch, the fourth power switch, and each capacitor switch are also connected to the third output terminal of the switching control unit.

[0145] Optionally, a third power resistor, a third power switch, and a fourth power switch are used to protect each capacitor.

[0146] Figure 10 This is a schematic diagram of the resistance output module in the instrument skills training device based on multiple types of variable electrical characteristic parameters provided by this utility model.

[0147] In one possible implementation, refer to Figure 10 As shown, the resistor output module includes a third resistor module and a fourth resistor module.

[0148] The first end of the third resistor module and the first end of the fourth resistor module are connected to the third output end of the switching control unit. The second end of the third resistor module is used to output the second ground signal to be measured. The third end of the third resistor module is connected to the second end of the fourth resistor module. The fourth end of the third resistor module is connected to the third end of the fourth resistor module. The fourth end of the fourth resistor module is used to output the resistance signal to be measured.

[0149] Figure 11 Another structural schematic diagram of the resistance output module in the instrument skills training device based on multiple types of variable electrical characteristic parameters provided by this utility model.

[0150] In one possible implementation, refer to Figure 11 As shown, in Figure 10 Based on this, the third resistor module includes: multiple DC resistors and DC resistor switches corresponding to each DC resistor.

[0151] The fourth resistor module includes: multiple insulation resistors and insulation resistor switches corresponding to each insulation resistor.

[0152] The control terminal of each DC resistance switch is connected to the third output terminal of the switching control unit. One end of the first DC resistor is used to output the second ground signal to be measured. One end of each DC resistor except the first one is connected to one end of the previous DC resistor. One end of the last DC resistor is also connected to one end of the first insulation resistor.

[0153] The other end of each DC resistor is also connected to one end of each DC resistor switch. Except for the last one, the other end of each DC resistor switch is connected to the other end of the next DC resistor switch. The other end of the last DC resistor switch is connected to the other end of the first insulation resistance switch.

[0154] The control terminal of each insulation resistance switch is connected to the third output terminal of the switching control unit. One end of the first insulation resistance is connected to one end of the last DC resistance, and one end of each insulation resistance except the first one is connected to one end of the previous insulation resistance.

[0155] The other end of each insulation resistor is connected to one end of each insulation resistor switch. The other end of the first insulation resistor switch is connected to the other end of the last DC resistance switch. Except for the first one, the other end of each insulation resistor switch is connected to the other end of the previous insulation resistor switch. The other end of the last insulation resistor switch is also used to output the resistance signal to be measured.

[0156] Optionally, the switching control unit can control each DC resistance switch and each insulation resistance switch to control the connection of the corresponding DC resistance and insulation resistance.

[0157] Figure 12 This is another structural schematic diagram of the instrument skills training device based on multiple types of variable electrical characteristic parameters provided by this utility model, with reference to... Figure 12 As shown, when it is necessary to generate electrical characteristic parameter values ​​for a certain railway electrical equipment, the interactive unit sends instructions to devices such as signal generators and switching controllers to generate corresponding output signals. The switching controller controls the switching switch to complete the gear switching. The circuit switches of the measuring board operate in sequence, and finally output the corresponding values ​​at the measuring position. Then, the trainee uses the measuring instrument to perform the measurement. The interactive unit collects the values ​​from the measuring instrument and evaluates the measurement results.

[0158] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An instrument skills training device based on multiple types of variable electrical characteristic parameters, characterized in that, include: The system includes an interaction unit, a DC power supply unit, an AC power supply unit, a switching control unit, and a signal output unit; the signal output unit includes multiple electronic devices, the switching control unit includes multiple relays, and the interaction unit is a control host. The first output terminal of the interaction unit is connected to the input terminal of the switching control unit, the second output terminal of the interaction unit is connected to the first input terminal of the DC power supply unit, the third output terminal of the interaction unit is connected to the first input terminal of the AC power supply unit, the first output terminal of the switching control unit is connected to the second input terminal of the DC power supply unit, the second output terminal of the switching control unit is connected to the second input terminal of the AC power supply unit, and the third output terminal of the switching control unit is connected to the first input terminal of the signal output unit. The second input terminal of the signal output unit is connected to the output terminal of the DC power supply unit and the output terminal of the AC power supply unit. The signal output unit is used to connect to external measuring instruments. The interaction unit is used to send signal generation instructions to the switching control unit; The switching control unit is used to respond to the signal generation command, control the DC power supply unit or the AC power supply unit to output a power signal to the signal output unit, and control the electronic devices in the signal output unit to be turned on or off, so that the signal output unit outputs the signal to be measured.

2. The instrument skills training device based on multiple types of variable electrical characteristic parameters according to claim 1, characterized in that, The DC power supply unit includes: a DC power supply module and a high voltage module; The first end of the DC power module is connected to the second output end of the interactive unit, the second end of the DC power module is connected to the first end of the high voltage module and the second input end of the signal output unit, and the second end of the high voltage module is connected to the first output end of the switching control unit.

3. The instrument skills training device based on multiple types of variable electrical characteristic parameters according to claim 1, characterized in that, The AC power supply unit includes: a signal generation module, a first switching unit, a power amplification module, a second switching unit, a transformer module, and a third switching unit; The input terminal of the signal generation module is connected to the output terminal of the interaction unit, the output terminal of the signal generation module is connected to the control terminal of the first switching unit, and the control terminal of the first switching unit is also connected to the second output terminal of the switching control unit. The first output terminal of the first switching unit is connected to the input terminal of the power amplifier module, and the second output terminal of the first switching unit is connected to the third input terminal of the signal output unit. The output terminal of the power amplifier module is connected to the control terminal of the second switching unit, the control terminal of the second switching unit is also connected to the second output terminal of the switching control unit, the first output terminal of the second switching unit is connected to the input terminal of the transformer module, and the second output terminal of the second switching unit is connected to the third input terminal of the signal output unit. The output terminal of the transformer module is connected to the control terminal of the third switch unit. The control terminal of the third switch is also connected to the second output terminal of the switching control unit. The control terminal of the second switch unit is also connected to the second output terminal of the switching control unit. The first output terminal of the second switch unit is connected to the third input terminal of the signal output unit.

4. The instrument skills training device based on multiple types of variable electrical characteristic parameters according to claim 1, characterized in that, The signal output unit includes: a current output module, a voltage output module, and a resistance output module; The current output module includes: an AC measurement component, an AC measurement switch, a DC measurement component, and a DC measurement switch; The input terminal of the AC measurement component is connected to the output terminal of the DC power supply unit and the output terminal of the AC power supply unit. The output terminal of the AC measurement component is connected to the input terminal of the AC measurement switch. The output terminal of the AC measurement switch is used to output the current signal to be measured. The control terminal of the AC measurement switch is also connected to the third output terminal of the switching control unit. The input terminal of the DC measurement component is connected to the output terminal of the DC power supply unit and the output terminal of the AC power supply unit. The output terminal of the DC measurement component is connected to the input terminal of the DC measurement switch. The output terminal of the DC measurement switch is used to output the current signal to be measured. The control terminal of the DC measurement switch is also connected to the third output terminal of the switching control unit. The first input terminal of the voltage output module is connected to the output terminal of the DC power supply unit and the output terminal of the AC power supply unit, respectively. The second input terminal of the voltage output module is connected to the third output terminal of the switching control unit. The output terminal of the voltage output module is used to output the voltage signal to be measured. The first input terminal of the resistance output module is connected to the output terminal of the DC power supply unit and the output terminal of the AC power supply unit, respectively. The second input terminal of the resistance output module is connected to the third output terminal of the switching control unit. The output terminal of the resistance output module is used to output the resistance signal to be measured.

5. The instrument skills training device based on multiple types of variable electrical characteristic parameters according to claim 4, characterized in that, The voltage output module includes: a first resistor module, a second resistor module, and a capacitor module; The first input terminal of the first resistor module is connected to the live wire of the output terminal of the DC power supply unit and the live wire of the output terminal of the AC power supply unit. The second input terminal of the first resistor module is connected to the neutral wire of the output terminal of the DC power supply unit and the neutral wire of the output terminal of the AC power supply unit. The first output terminal of the first resistor module is connected to the first input terminal of the second resistor module. The second output terminal of the first resistor module is connected to the second input terminal of the second resistor module. The third input terminal of the first resistor module is connected to the third output terminal of the switching control unit. The first output terminal of the second resistor module is connected to the first input terminal of the capacitor module, the second output terminal of the second resistor module is connected to the second input terminal of the capacitor module, and the third input terminal of the second resistor module is connected to the third output terminal of the switching control unit. The first output terminal of the capacitor module is used to output the first ground signal to be measured, and the second output terminal of the capacitor module is used to output the voltage signal to be measured.

6. The instrument skills training device based on multiple types of variable electrical characteristic parameters according to claim 5, characterized in that, The first resistor module includes a first power resistor, a first power switch, a second power resistor, and a second power switch; One end of the first power resistor is connected to the live wire of the output terminal of the DC power supply unit and the live wire of the output terminal of the AC power supply unit. The other end of the first power resistor is connected to one end of the first power switch. The other end of the first power switch is connected to the neutral wire of the output terminal of the DC power supply unit and the neutral wire of the output terminal of the AC power supply unit. The control terminal of the first power switch is connected to the third output terminal of the switching control unit. One end of the first power resistor is also connected to one end of the second power resistor, the other end of the first power switch is also connected to the other end of the second power switch, the other end of the second power resistor is connected to one end of the second power switch, and the control terminal of the second power switch is connected to the third output terminal of the switching control unit. One end of the second power resistor is also connected to the first input terminal of the second resistor module, and the other end of the second power switch is also connected to the second input terminal of the second resistor module.

7. The instrument skills training device based on multiple types of variable electrical characteristic parameters according to claim 5, characterized in that, The second resistor module includes multiple online resistors and online resistor switches corresponding to each of the online resistors; One end of the first online resistor is connected to the first output terminal of the first resistor module, the other end of the first online resistor is connected to one end of the first online resistor switch, the other end of the first online resistor switch is connected to the second output terminal of the first resistor module, and the control terminal of the first online resistor switch is also connected to the third output terminal of the switching control unit. One end of each online resistor except the first online resistor is connected to one end of the previous online resistor, the other end of each online resistor except the first online resistor is connected to one end of each online resistor switch, the other end of each online resistor switch is connected to the other end of the previous online resistor, and the control terminal of each online resistor switch is connected to the third output terminal of the switching control unit. One end of the last online resistor is also connected to the first input terminal of the capacitor module, the other end of the last online resistor is connected to one end of the last online resistor switch, and the control terminal of the last online resistor switch is connected to the third output terminal of the switching control unit.

8. The instrument skills training device based on multiple types of variable electrical characteristic parameters according to claim 5, characterized in that, The capacitor module includes: multiple capacitors and a capacitor switch, a third power resistor, a third power switch and a fourth power switch corresponding to each capacitor; One end of the third power resistor is connected to the first output terminal of the second resistor module and one end of the third power switch. The other end of the third power resistor is connected to one end of each of the capacitors and one end of the fourth power switch. The other end of the third power switch is connected to the other end of the fourth power switch. The other end of the third power switch is also used to output the first ground signal to be measured. The other end of each capacitor is connected to one end of each capacitor switch. The other end of the first capacitor switch is connected to the second output terminal of the second resistor module. The other end of each capacitor switch except the last capacitor switch is connected to the other end of the next capacitor switch. The other end of the last capacitor switch is used to output the voltage signal to be measured. The control terminals of the third power switch, the fourth power switch, and each of the capacitor switches are also connected to the third output terminal of the switching control unit.

9. The instrument skills training device based on multiple types of variable electrical characteristic parameters according to claim 4, characterized in that, The resistor output module includes: a third resistor module and a fourth resistor module; The first end of the third resistor module and the first end of the fourth resistor module are connected to the third output end of the switching control unit. The second end of the third resistor module is used to output the second ground signal to be measured. The third end of the third resistor module is connected to the second end of the fourth resistor module. The fourth end of the third resistor module is connected to the third end of the fourth resistor module. The fourth end of the fourth resistor module is used to output the resistance signal to be measured.

10. The instrument skills training device based on multiple types of variable electrical characteristic parameters according to claim 9, characterized in that, The third resistor module includes: a plurality of DC resistors and a DC resistor switch corresponding to each of the DC resistors; The fourth resistor module includes: a plurality of insulating resistors and an insulating resistor switch corresponding to each of the insulating resistors; The control terminal of each DC resistance switch is connected to the third output terminal of the switching control unit. One end of the first DC resistor is used to output the second ground signal to be measured. One end of each DC resistor other than the first one is connected to one end of the previous DC resistor. One end of the last DC resistor is also connected to one end of the first insulation resistor. The other end of each of the DC resistors is also connected to one end of each of the DC resistor switches. Except for the last one, the other end of each of the DC resistor switches is connected to the other end of the next DC resistor switch. The other end of the last DC resistor switch is connected to the other end of the first insulation resistance switch. The control terminal of each insulation resistance switch is connected to the third output terminal of the switching control unit. One end of the first insulation resistance is connected to one end of the last DC resistance, and one end of each insulation resistance except the first one is connected to one end of the previous insulation resistance. The other end of each of the insulation resistors is connected to one end of each of the insulation resistor switches. The other end of the first insulation resistor switch is connected to the other end of the last DC resistance switch. Except for the first one, the other end of each of the insulation resistor switches is connected to the other end of the previous insulation resistor switch. The other end of the last insulation resistor switch is also used to output the resistance signal to be measured.

Images