Self-adaptive current generating device and control method thereof

Abstract

The invention relates to a self-adaptive current generating device and a control method thereof, and the device comprises an input power supply, an adjustable transformer, a first ammeter disposed at the input end of the adjustable transformer, a second ammeter disposed at the output end of the adjustable transformer, a servo motor, and a control system. Through a method of setting different current values at different moments and a method of loading a time current curve, the voltage can be continuously and accurately adjusted so as to change the current, the real-time current and the load temperature are recorded, and the current self-adjusting function of the current generator is realized. Compared with the prior art, the constant current generator can simulate operating environments under various current conditions, solves the problem that a constant current generator cannot realize a current self-adjusting function, provides more flexible test conditions, and can be widely applied to different test scenes.

Description

Technical Field

[0001] The present invention relates to the technical field of current generators, and in particular to an adaptive current generating device and a control method thereof. Background Art

[0002] High current generators are widely used in many fields, including power systems, electric vehicles, and electronic equipment testing. During use, it is necessary to connect the high current generator to the load to simulate the current changes in the corresponding scenario. Common high current generators are divided into two types: manual control and automatic control. Among them, the manual control method relies on the operator to observe the voltage and current meters on the current generator and manually rotate the knob to adjust, which has problems such as instability, low precision, safety hazards, and slow adjustment speed. The automatic control method can record the changes in current and temperature through sensors, and automatically stop or turn on the power supply after reaching the preset threshold, and record the corresponding temperature and current values ​​at the same time, but usually only a fixed current value can be set, that is, the device is started after the fixed current value is set, and the device automatically turns off the current after the temperature is constant to continue recording the temperature changes. However, in real life, the changes in loads are often not constant, and there may be obvious ups and downs. Therefore, the existing current generators cannot adapt to the dynamic changes of the load, which limits its testing needs in actual scenarios.

[0003] With respect to the above-mentioned problems in the related technologies, no effective solution has been proposed yet. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide an adaptive current generating device and a control method thereof to restore or reproduce a change of the actual load current, and then analyze the circuit fault or carrying capacity.

[0005] During the conception process of the present invention: the present invention can continuously and accurately adjust the voltage to achieve the change of current by setting different current values ​​at different times and the method of loading time current curve, record the real-time current and load temperature, and realize the current self-regulation function of the current generator.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] On the one hand, the present invention provides an adaptive current generating device, comprising: an input power supply, an adjustable transformer, a first ammeter provided at the input end of the adjustable transformer, a second ammeter provided at the output end of the adjustable transformer, an electrical object to be measured, a servo motor and a control system, wherein the input power supply, the first ammeter, the adjustable transformer and the second ammeter are electrically connected in sequence, and the control system is electrically connected to the servo motor, the first ammeter, the adjustable transformer, the second ammeter and the electrical object to be measured respectively;

[0008] The input power supply is used to provide input voltage for the adjustable transformer;

[0009] The first ammeter is used to measure input current;

[0010] The adjustable transformer is used to adjust the input voltage to obtain an adjusted voltage;

[0011] The second ammeter is used to measure the regulated output current and feed back the signal to the control system;

[0012] The servo motor is connected to the transmission shaft of the adjustable transformer, and the servo motor is used to receive instructions from the control system and accurately control the moving position of the coil of the adjustable transformer, thereby adjusting the output voltage;

[0013] The control system receives parameter information or time-current curve information input by the user and loads time-current data, sends instructions to the servo motor according to the set data, adjusts the output voltage of the adjustable transformer, and thus indirectly changes the current in the circuit so that the current gradually approaches or reaches the set value.

[0014] Furthermore, the adjustable transformer is a concentric circle adjustable transformer or a cylindrical adjustable transformer.

[0015] Furthermore, the control system is communicatively connected to a user-side computer device.

[0016] Furthermore, the rated output power of the input power source is greater than the maximum power consumption of the electrical object being measured.

[0017] On the other hand, the present invention further provides a control method for the adaptive current generating device as described above, wherein the control method includes at least one of the following two modes:

[0018] Mode 1: Based on the starting current value, ending current value, current interval, and time interval set by the user, the control system sends instructions to the servo motor to adjust the output voltage of the adjustable transformer. The second ammeter feeds back the output current value to the control system. After each current change, the control system waits for the set time interval, then makes the next current adjustment and records the real-time current and load temperature.

[0019] Mode 2: Based on the user-selected custom time-current curve or a preset time-current curve selected from the pre-stored current curve database, the control system first determines whether the data format of the selected time-current curve is correct. If the data format is incorrect, an error message prompt window will pop up to remind the user to make corrections. After the data format is correct, the time-current curve is loaded into the control system. The control system will send instructions to the servo motor according to the time-current curve, adjust the output voltage of the adjustable transformer, and the second ammeter will feed back the output current to the control system and record the real-time current and load temperature.

[0020] Furthermore, in mode 1, the starting current value can be greater than or less than or equal to the ending current value, and a period of no current loading state can be maintained before and after the current loading.

[0021] Furthermore, in mode 2, the customized time-current curve can be transferred to the pre-stored current curve database, and the curve can be called before the next use.

[0022] Furthermore, in mode 2, the specific steps of determining whether the data format of the time-current curve is correct include: determining whether the current parameter in the time-current curve exceeds the maximum current limit of the device, and the control system prompts the curve segment that exceeds the maximum current limit of the device.

[0023] Furthermore, the control method can set the time interval for recording the real-time current and load temperature, set the number of repetitions of the loading curve, and set the interval time between the repetitions of the loading curve.

[0024] Furthermore, the control method allows differences between the set value and the actual value, and performs real-time dynamic adjustment according to the loop conditions to ensure optimal accuracy.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) The present invention can simulate the operating environment under various current conditions by setting different current values ​​at different times, thereby solving the current self-regulation function that cannot be achieved by a constant current generator, providing more flexible test conditions, and can be widely used in different test scenarios.

[0027] (2) The present invention can reproduce the real power operation scene and dynamically observe the relevant electronic devices through the method of loading the time-current curve. Especially when a fault occurs, the cause of the fault can be more accurately located through curve reproduction, thereby improving the efficiency and accuracy of fault diagnosis.

[0028] (3) The current generator provided by the present invention can not only save customized time-current curves and loading curves, but also perform multiple cycles of tests on the set curves, which helps to analyze the consistency of data and ensure the reliability and repeatability of test results. By loading the same curve in different seasons to analyze the impact of climate on the test, the impact of environmental changes on equipment performance is evaluated, providing important reference data for the application of equipment in different environments.

[0029] (4) The present invention supports remote monitoring, connects the control system with the user-side computer equipment, and can remotely remind the current status, facilitating observation by multiple people and reducing the number of on-site supervisors. This function improves the safety and convenience of the test, and makes data sharing and collaboration easier. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the current generating device of the present invention;

[0031] Figure 2 Schematic diagram of two modes of the control method of the current generating device of the present invention;

[0032] Figure 3 Schematic diagram of the structure of the concentric circle adjustable transformer in Embodiment 1 of the present invention;

[0033] Figure 4 Schematic diagram of the structure of a cylindrical adjustable transformer in Embodiment 1 of the present invention;

[0034] Figure 5 This is a schematic diagram of a time-current curve of Mode 1 in Example 2 of the present invention;

[0035] Figure 6 Schematic diagram of the time-current curve of mode 2 in embodiment 2 of the present invention.

[0036] The names corresponding to the figure marks in the accompanying drawings are: 1-input power supply, 2-first ammeter, 3-adjustable transformer, 4-second ammeter, 5-cable for ring network cabinet, 6-measured current sensor, 7-control system, 8-ambient temperature and humidity monitoring equipment, 9-first AC voltmeter, 10-second AC voltmeter, 11-annular coil, 12-first contact arm, 13-first servo motor, 14-cylindrical coil, 15-second contact arm, 16-second servo motor, 17-movement block. DETAILED DESCRIPTION

[0037] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. The following embodiments are implemented based on the above technical solution of the present invention, and provide detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following embodiments.

[0038] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0039] Among them, the drawings are only used for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limitations on this patent: in order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0040] In the following implementation modes or examples, unless otherwise specified, features such as structure / module name, control mode, algorithm, process or composition ratio are deemed to be common technical features disclosed in the prior art.

[0041] Example 1

[0042] See also Figure 1 and 2 The adaptive current generating device proposed in this embodiment includes: an input power supply 1, an adjustable transformer 3, a first ammeter 2 provided at the input end of the adjustable transformer 3, a second ammeter 4 provided at the output end of the adjustable transformer 3, a servo motor and a control system 7, wherein the input power supply 1, the first ammeter 2, the adjustable transformer 3, and the second ammeter 4 are electrically connected in sequence, and the control system 7 is electrically connected to the servo motor, the first ammeter 2, the adjustable transformer 3, the second ammeter 4, and the electrical object to be measured respectively;

[0043] The input power supply 1 is used to provide an input voltage for the adjustable transformer 3. In this embodiment, the input voltage is 220V;

[0044] The first ammeter 2 is used to measure the input current;

[0045] The adjustable transformer 3 is used to adjust the input voltage to obtain an adjusted voltage;

[0046] The second ammeter 4 is used to measure the regulated output current and feed the signal back to the control system 7;

[0047] The servo motor is connected to the transmission shaft of the adjustable transformer 3, and the servo motor is used to receive instructions from the control system 7, accurately control the moving position of the coil of the adjustable transformer 3, and thus adjust the output voltage;

[0048] The control system 7 receives the parameter information or time-current curve information input by the user and loads the time-current data, sends instructions to the servo motor according to the set data, adjusts the output voltage of the adjustable transformer 3, and thus indirectly changes the current in the circuit so that the current gradually approaches or reaches the set value.

[0049] In a specific implementation, the control system 7 includes a single-chip microcomputer or one of the x86 architecture, ARM architecture, and RISC-V architecture processors, and corresponding storage devices and IO devices.

[0050] In this embodiment, the input end and the output end of the adjustable transformer 3 are also connected to the first AC voltmeter 9 and the second AC voltmeter 10 respectively. The adjustable transformer 3 changes the size of the AC voltage according to the principle of electromagnetic induction to meet the power demand of the measured power user.

[0051] In this embodiment, the measured electrical object includes a ring main unit cable 5 and a measured current sensor 6. The ring main unit cable 5 forms a loop at the output end of the adjustable transformer 3. The accuracy of the measured current sensor 6 is higher than that of the second ammeter 4. The measured current sensor 6 can be used to verify the accuracy of the data of the second ammeter 4.

[0052] In this embodiment, the control system 7 is also connected to an environmental temperature and humidity monitoring device 8 , which is used to monitor the temperature and humidity of the environment and feed back the signal to the control system 7 .

[0053] After power is turned on, the control system 7 obtains the loop current (actual current value) from the second ammeter 4, and compares it with the set value, and sends instructions to the servo motor to change the coil movement position of the adjustable transformer 3 to adjust the voltage, and indirectly adjust the loop current so that it gradually approaches or reaches the set value. In the adaptive current generating device provided in this embodiment, this process is dynamic, which means that the control system 7 will continuously adjust the voltage according to the real-time feedback of the second ammeter 4 to cope with changes in load or external conditions.

[0054] The adjustable transformer 3 used in this embodiment is a concentric circle adjustable transformer or a cylindrical adjustable transformer. Figure 3 , the control system 7 sends a signal to the first servo motor 13. After receiving the signal, the first servo motor 13 drives the first contact arm 12 of the toroidal transformer to move along the radial direction of the toroidal coil 11 to adjust the output voltage. Figure 4 The second servo motor 16 drives the moving block 17 on the lead screw to move along the lead screw, and the moving block 17 drives the second contact arm 15 to move on the cylindrical coil 14, thereby changing the output voltage of the adjustable transformer 3.

[0055] In this embodiment, the control system 7 is communicatively connected with the user-side computer device.

[0056] In this embodiment, the rated output power of the input power source 1 is greater than the maximum power consumption of the ring main unit cable 5 to ensure the stability and effectiveness of the measurement and control process.

[0057] Example 2

[0058] The control method of the adaptive current generating device proposed in this embodiment includes the following two modes:

[0059] Mode 1: Based on the starting current value, ending current value, current interval, and time interval set by the user, the control system 7 sends instructions to the servo motor to adjust the output voltage of the adjustable transformer 3. The second ammeter 4 feeds back the output current value to the control system 7. After each current change, the control system 7 waits for the set time interval, then makes the next current adjustment and records the real-time current and load temperature.

[0060] Mode 2: Based on the user-defined time-current curve selected or a preset time-current curve selected from the pre-stored current curve database, the control system 7 first determines whether the data format of the selected time-current curve is correct. If the data format is incorrect, an error message prompt window will pop up to remind the user to make corrections. After the data format is correct, the time-current curve is loaded into the control system 7. The control system 7 will send instructions to the servo motor according to the time-current curve, adjust the output voltage of the adjustable transformer 3, and the second ammeter 4 will feed back the output current to the control system 7, and record the real-time current and load temperature.

[0061] In this embodiment, in mode one, the starting current value can be greater than or less than or equal to the ending current value, and an unloaded current state can be maintained for a period of time before and after the loading current. The main purpose is to avoid interference caused by some operations before and after the experiment. By setting the unloaded current time period before and after, the device has a stable stage.

[0062] In this embodiment, in mode 2, the specific steps of determining whether the data format of the time-current curve is correct include: determining whether the current parameter in the time-current curve exceeds the maximum current limit of the device, and the control system 7 reminds the curve segment that exceeds the maximum current limit of the device.

[0063] In this embodiment, the control method also includes: setting the time interval for recording the real-time current and load temperature, setting the number of repetitions of the loading curve, and setting the interval time between the repetitions of the loading curve. Since the mechanical structure has an action time, when setting the time interval, the time interval cannot be less than the minimum action time of the control system 7 to avoid damage to the equipment due to untimely action.

[0064] In this embodiment, the control method also allows differences between the set value and the actual value, and performs real-time dynamic adjustment according to the loop conditions to ensure optimal accuracy.

[0065] See also Figure 5 According to the control method of mode 1, the time-current curve is divided into 8 stages, namely L100, L101, L102, L103, L104, L105, L106, and L107. The middle part of each stage is the action adjustment time of the current generator. In the L100 stage, the load is not loaded with current. In the L101 stage, a constant current is loaded to the load for 5s. In the following stages, the loop current is continuously reduced, and then the loop current is continuously increased until the current is turned off in the L107 stage, and the experiment is stopped.

[0066] See also Figure 6 In mode 2, the custom time-current curve can be transferred to the pre-stored current curve database and can be called before the next use. The curve is saved in the common csv format, with the first line as the title, the first column as the time, which records the time point of measurement or simulation, and the second column as the current value, which records the current reading at the corresponding time point. In order to convert the data of the actual substation system into a format that can be used by the current generator, it is necessary to calculate the time interval through the first-order difference, and then load the time interval and the current data at the corresponding time point into the current generator.

[0067] It should be noted that the first ammeter 2, the second ammeter 4, the first AC voltmeter 9, the second AC voltmeter 10, and the measured current sensor 6 all need to be sent to relevant measurement units for measurement and calibration before use.

[0068] The above description of the embodiments is to facilitate the understanding and use of the present invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. An adaptive current generating device, characterized in that: include: An input power source (1), an adjustable transformer (3), a first ammeter (2) provided at the input end of the adjustable transformer (3), a second ammeter (4) provided at the output end of the adjustable transformer (3), a servo motor and a control system (7), wherein the input power source (1), the first ammeter (2), the adjustable transformer (3) and the second ammeter (4) are electrically connected in sequence, and the control system (7) is electrically connected to the servo motor, the first ammeter (2), the adjustable transformer (3), the second ammeter (4) and the electrical object to be measured respectively; The input power supply (1) is used to provide an input voltage for the adjustable transformer (3); The first ammeter (2) is used to measure input current; The adjustable transformer (3) is used to adjust the input voltage to obtain an adjusted voltage; The second ammeter (4) is used to measure the regulated output current and feed back the signal to the control system (7); The servo motor is connected to the transmission shaft of the adjustable transformer (3), and the servo motor is used to receive instructions from the control system (7) to accurately control the movement position of the coil of the adjustable transformer (3), thereby adjusting the output voltage; The control system (7) receives parameter information or time-current curve information input by a user and loads time-current data, sends instructions to the servo motor according to the set data, and adjusts the output voltage of the adjustable transformer (3), thereby indirectly changing the current in the circuit so that the current gradually approaches or reaches the set value.

2. An adaptive current generating device according to claim 1, characterized in that: The adjustable transformer (3) is a concentric circle adjustable transformer or a cylindrical adjustable transformer.

3. The adaptive current generating device according to claim 1, characterized in that: The control system (7) is communicatively connected with the user-side computer equipment.

4. The adaptive current generating device according to claim 1, characterized in that: The rated output power of the input power source (1) is greater than the maximum power consumption of the electrical object being measured.

5. A control method for an adaptive current generating device according to any one of claims 1 to 4, characterized in that: The control method includes at least one of the following two modes: Mode 1: Based on the starting current value, ending current value, current interval, and time interval set by the user, the control system (7) sends a command to the servo motor to adjust the output voltage of the adjustable transformer (3), and the second ammeter (4) feeds back the output current value to the control system (7). After each current change, the control system (7) waits for the set time interval, and then performs the next current adjustment and records the real-time current and load temperature. Mode 2: Based on a user-defined time-current curve selected by the user or a preset time-current curve selected from a pre-stored current curve database, the control system (7) first determines whether the data format of the selected time-current curve is correct. If the data format is incorrect, an error message prompt window will pop up to remind the user to make corrections. After the data format is correct, the time-current curve is loaded into the control system (7). The control system (7) sends instructions to the servo motor according to the time-current curve to adjust the output voltage of the adjustable transformer (3). The second ammeter (4) feeds back the output current to the control system (7) and records the real-time current and load temperature.

6. A control method for an adaptive current generating device according to claim 5, characterized in that: In mode 1, the starting current value can be greater than or less than or equal to the ending current value, and a period of no current loading state can be maintained before and after the current loading.

7. The control method of the adaptive current generating device according to claim 5, characterized in that: In mode 2, the customized time-current curve can be transferred to the pre-stored current curve database and the curve can be called before the next use.

8. The control method of the adaptive current generating device according to claim 5, characterized in that: In mode 2, the specific steps of determining whether the data format of the time current curve is correct include: determining whether the current parameter in the time current curve exceeds the maximum current limit of the device, and the control system (7) reminding the curve segment that exceeds the maximum current limit of the device.

9. The control method of the adaptive current generating device according to claim 5, characterized in that: The control method further includes: setting a time interval for recording the real-time current and the load temperature, setting the number of repetitions of the loading curve, and setting the interval time between the repetitions of the loading curve.

10. The control method of the adaptive current generating device according to claim 5, characterized in that: The control method allows differences between the set value and the actual value, and performs real-time dynamic adjustment according to the loop conditions to ensure optimal accuracy.

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