A frequency converter load automatic detection device

Abstract

The application is suitable for the technical field of frequency converters, and provides a frequency converter load automatic detection device, which comprises a touch screen, a controller, a loading circuit, a slip motor, a first acquisition circuit and a second acquisition circuit; the data end of the touch screen is connected with the first data end of the controller, the second data end of the controller is connected with the data end of the loading circuit, the output end of the loading circuit is connected with the first end of the slip motor, the second end of the slip motor is connected with the output end of the measured frequency converter, the input end of the first acquisition circuit is connected with the output end of the measured frequency converter, the input end of the second acquisition circuit is connected with the second end of the slip motor, and the output end of the first acquisition circuit and the output end of the second acquisition circuit are both connected with the input end of the controller. The application can improve the factory debugging efficiency of the frequency converter, and further improve the production efficiency of the frequency converter.

Description

Technical Field

[0001] This application belongs to the field of frequency converter technology, and in particular relates to an automatic load detection device for frequency converters. Background Technology

[0002] Factory commissioning of frequency converters is a critical step in their performance and reliability, directly determining their factory start-up pass rate.

[0003] Currently, most frequency converters undergo manual testing before leaving the factory. The process involves manual loading and testing, manually judging whether the three-phase output current is balanced, and verifying the accuracy of the output current measurement. This method is inefficient, and operators are prone to fatigue under prolonged operation, leading to frequent misjudgments and missed tests, and also posing a risk of electric shock. To improve the overall pass rate of frequency converters leaving the factory and to ensure personnel safety, it is necessary and of great significance to provide an automatic load testing device for frequency converters to solve these problems. Utility Model Content

[0004] This application provides an automatic load testing device for frequency converters, which can solve the problem of low production efficiency of frequency converters.

[0005] This application provides an automatic load detection device for frequency converters, including:

[0006] Touch screen, controller, loading circuit, slip motor, first acquisition circuit and second acquisition circuit;

[0007] The touchscreen's data terminal is connected to the controller's first data terminal, the controller's second data terminal is connected to the loading circuit's data terminal, the loading circuit's output terminal is connected to the slip-ring motor's first terminal, the slip-ring motor's second terminal is connected to the inverter under test's output terminal, the first acquisition circuit's input terminal is connected to the inverter under test's output terminal, the second acquisition circuit's input terminal is connected to the slip-ring motor's second terminal, and both the first and second acquisition circuits' output terminals are connected to the controller's input terminal.

[0008] Optionally, the loading circuit includes an RC buffer unit, a rectifier bridge, a stepper motor, and a voltage regulator mounted on the output shaft of the stepper motor.

[0009] The control terminal of the stepper motor is the data terminal of the loading circuit. The output terminal of the voltage regulator is connected to the input terminal of the RC buffer unit. The output terminal of the RC buffer unit is connected to the input terminal of the rectifier bridge. The output terminal of the rectifier bridge is the output terminal of the loading circuit.

[0010] Optionally, the first acquisition circuit includes: an ammeter and a voltmeter;

[0011] The input terminals of the ammeter and voltmeter are both connected to the output terminals of the frequency converter under test, and the output terminals of the ammeter and voltmeter are both connected to the input terminals of the controller.

[0012] Optionally, the second acquisition circuit includes a voltage transformer and a current transformer;

[0013] The input terminals of both the voltage transformer and the current transformer are connected to the second terminal of the slip-ring motor, and the output terminals of both the voltage transformer and the current transformer are connected to the input terminal of the controller.

[0014] Optionally, the inverter load automatic testing equipment also includes an AC power supply, the output of which is connected to the power supply terminal of the inverter under test.

[0015] Optionally, the inverter automatic load detection device also includes a transformer unit, the input of which is connected to the output of the AC power supply, and the output of which is connected to the power supply of the loading circuit.

[0016] Optionally, the inverter load automatic detection equipment also includes a switching power supply module. The input terminal of the switching power supply module is connected to the output terminal of the transformer unit, and the output terminal of the switching power supply module is connected to the power supply terminal of the touch screen, the power supply terminal of the controller, the power supply terminal of the first acquisition circuit, and the power supply terminal of the second acquisition circuit, respectively.

[0017] Optionally, the controller is a central processing unit.

[0018] The above-mentioned solution in this application has the following beneficial effects:

[0019] In the embodiments of this application, during factory commissioning, the load on the slip-ring motor is changed by a loading circuit. To stabilize the speed of the slip-ring motor, the inverter under test adjusts its output to adjust the speed of the slip-ring motor. Simultaneously, during commissioning, the first acquisition circuit collects the current and voltage output of the inverter under test, and the second acquisition circuit collects the current and voltage of the slip-ring motor. Then, the controller compares the current output of the inverter under test with the current of the slip-ring motor, and compares the voltage output of the inverter under test with the voltage of the slip-ring motor, outputting the results to a touchscreen to display the commissioning results of the inverter under test, thus automating the factory commissioning of the inverter. Compared with existing manual commissioning methods, this automated factory commissioning method significantly shortens commissioning time, improves the efficiency of inverter factory commissioning, and consequently improves the production efficiency of the inverter.

[0020] Furthermore, the automated debugging in this application can avoid errors caused by fatigue during manual debugging. At the same time, early measurement after production assembly can prevent production operators from coming into contact with high-voltage electricity, reduce the occurrence of production safety accidents, and provide personal safety protection for production operators.

[0021] Other beneficial effects of this application will be described in detail in the following detailed description section. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the structure of an automatic load detection device for a frequency converter provided in an embodiment of this application. Figure 1 ;

[0024] Figure 2 A schematic diagram of the structure of an automatic load detection device for a frequency converter provided in an embodiment of this application. Figure 2 .

[0025] [Explanation of Labels in the Attached Image]

[0026] 101. Touch screen; 102. Controller; 103. Loading circuit; 104. Slip motor; 105. First acquisition circuit; 106. Second acquisition circuit; 107. AC power supply; 108. Transformer unit; 109. Switching power supply module; 2. Inverter under test. Detailed Implementation

[0027] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0028] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0029] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0030] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0031] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0033] To address the low efficiency of current inverter factory commissioning, this application provides an automatic load testing device for inverters. During factory commissioning, this device changes the load on a slip-ring motor via a loading circuit. To stabilize the slip-ring motor's speed, the inverter under test adjusts its output to regulate the motor's speed. Simultaneously, during commissioning, a first acquisition circuit collects the current and voltage outputs of the inverter under test, and a second acquisition circuit collects the current and voltage of the slip-ring motor. The controller then compares the output current of the inverter under test with the current of the slip-ring motor, and the output voltage of the inverter under test with the voltage of the slip-ring motor. The results are output to a touchscreen to display the commissioning results of the inverter under test, thus automating the inverter factory commissioning process. Compared to existing manual commissioning methods, this automated factory commissioning method significantly reduces commissioning time, improves the efficiency of inverter factory commissioning, and consequently increases inverter production efficiency.

[0034] Furthermore, the automated debugging in this application can avoid errors caused by fatigue during manual debugging. At the same time, early measurement after production assembly can prevent production operators from coming into contact with high-voltage electricity, reduce the occurrence of production safety accidents, and provide personal safety protection for production operators.

[0035] The automatic load detection device for frequency converters provided in this application will be described exemplarily below with reference to specific embodiments.

[0036] like Figure 1 As shown, the inverter load automatic detection device provided in this application includes: a touch screen 101, a controller 102, a loading circuit 103, a slip differential motor 104, a first acquisition circuit 105, and a second acquisition circuit 106.

[0037] The data terminal of the touch screen 101 is connected to the first data terminal of the controller 102, the second data terminal of the controller 102 is connected to the data terminal of the loading circuit 103, the output terminal of the loading circuit 103 is connected to the first terminal of the slip motor 104, the second terminal of the slip motor 104 is connected to the output terminal of the inverter under test 2, the input terminal of the first acquisition circuit 105 is connected to the output terminal of the inverter under test 2, the input terminal of the second acquisition circuit 106 is connected to the second terminal of the slip motor 104, and the output terminals of the first acquisition circuit 105 and the second acquisition circuit 106 are both connected to the input terminal of the controller 102.

[0038] The aforementioned slip differential motor 104 can be understood as the load of the frequency converter 2 under test. The first end of the slip differential motor 104 can be understood as the control end, so that the loading circuit 103 can adjust the load size of the slip differential motor 104.

[0039] During factory commissioning, the user can input a load adjustment signal to the controller 102 via the touchscreen 101 (this load adjustment signal is used to indicate the load adjustment status of the slip differential motor 104, such as increasing the load of the slip differential motor 104 by 20%). After receiving the load adjustment signal, the controller 102 will output a load adjustment signal to the loading circuit 103, so that the loading circuit 103 adjusts the load size of the slip differential motor 104. After the load of the slip differential motor 104 is adjusted, in order to stabilize the speed of the slip differential motor 104, the inverter under test 2 will adjust its own output to adjust the speed of the slip differential motor 104. Meanwhile, during the debugging process, the current and voltage output of the inverter under test 2 are collected by the first acquisition circuit 105, and the current and voltage of the slip motor 104 are collected by the second acquisition circuit 106. Then, the controller 102 compares the current output of the inverter under test 2 with the current of the slip motor 104, compares the voltage output of the inverter under test 2 with the voltage of the slip motor 104, and outputs the debugging results to the touch screen 101 to display the debugging results of the inverter under test 2, thereby automating the factory debugging of the inverter.

[0040] It should be noted that the first acquisition circuit 105 acquires the current and voltage output of the inverter under test 2, while the second acquisition circuit 106 acquires the current and voltage of the slip-ring motor 104. Since different acquisition circuits are used to acquire the current / voltage of the inverter under test 2 and the slip-ring motor 104, the acquired values ​​may differ. Therefore, if the current difference between the output current of the inverter under test 2 and the current of the slip-ring motor 104 is within the allowable difference range (which can be pre-stored in the controller 102), and the voltage difference between the output voltage of the inverter under test 2 and the voltage of the slip-ring motor 104 is also within the allowable difference range, then the inverter under test 2 is considered to have passed the test (i.e., the three-phase output current of the inverter is balanced, and the output current detection accuracy is qualified), and the factory commissioning is passed. However, if the current difference or voltage difference exceeds the allowable difference range, then the inverter under test 2 is considered to have failed the test, and the factory commissioning is not passed.

[0041] Accordingly, in some embodiments of this application, after receiving the current and voltage outputs from the first acquisition circuit 105 and the second acquisition circuit 106, the controller 102 uses its own comparison function to compare the current / voltage of the output terminal of the inverter under test 2 and the slip-ring motor 104, and outputs the result to the touch screen 101 so that the touch screen 101 can display the debugging result based on its own display function. In some optional embodiments, the controller 102 can output a signal indicating whether the inverter under test 2 is qualified or unqualified to the touch screen 101, and can also simultaneously output the current and voltage of the output terminal of the inverter under test 2 and the slip-ring motor 104 to the touch screen 101 for display, so that relevant operators can know the factory debugging result of the inverter under test 2.

[0042] It should be noted that the user inputs load adjustment signals to the controller 102 via the touchscreen 101, and the controller 102 transmits corresponding signals to the loading circuit 103. These signal transmission functions are inherent to both the touchscreen 101 and the controller 102, and all signals in this application can be transmitted via electrical signals. As a preferred embodiment, the controller 102 can be a central processing unit (CPU), and the touchscreen 101 can be a Delta DOP-B07S515 touchscreen. It is understood that in actual use, similar to the use of a traditional CPU, the CPU in this application can be equipped with corresponding traditional peripheral circuits. As an optional example, the CPU can be an Intel E3845 processor. It is understood that the specific model of the CPU is not limited in this embodiment and can be adjusted according to actual circumstances.

[0043] In some embodiments of this application, the loading circuit 103 includes an RC buffer unit, a rectifier bridge, a stepper motor, and a voltage regulator disposed on the output shaft of the stepper motor. As a preferred example, the voltage regulator is an AC voltage regulator.

[0044] The control terminal of the stepper motor is the data terminal of the loading circuit 103. The output terminal of the voltage regulator is connected to the input terminal of the RC buffer unit. The output terminal of the RC buffer unit is connected to the input terminal of the rectifier bridge. The output terminal of the rectifier bridge is the output terminal of the loading circuit 103.

[0045] It should be noted that the connection between the voltage regulator and the stepper motor is mechanical, while other connections are electrical. When the stepper motor receives a load adjustment signal from the controller 102 at its control terminal, it adjusts its speed, which in turn adjusts the voltage output of the voltage regulator. The adjusted voltage (which is AC) is converted into DC voltage by the RC buffer unit and the rectifier bridge before being output to the first terminal of the slip differential motor 104 (i.e., the control terminal of the slip differential motor 104), thereby changing the load on the slip differential motor 104. It should be further noted that the RC buffer unit uses a traditional RC buffer circuit, and the rectifier bridge uses a traditional rectifier bridge structure.

[0046] In some embodiments of this application, the first acquisition circuit 105 includes an ammeter and a voltmeter; the input terminals of both the ammeter and the voltmeter are connected to the output terminals of the inverter under test 2, and the output terminals of both the ammeter and the voltmeter are connected to the input terminals of the controller 102. The ammeter is used to acquire the current at the output terminal of the inverter under test 2 and output the acquired current to the controller 102; the voltmeter is used to acquire the voltage at the output terminal of the inverter under test 2 and output the acquired voltage to the controller 102.

[0047] In some embodiments of this application, the second acquisition circuit 106 includes a voltage transformer and a current transformer; the input terminals of both the voltage transformer and the current transformer are connected to the second terminal of the slip-ring motor 104 (i.e., the connection terminal between the motor and the frequency converter under test), and the output terminals of both the voltage transformer and the current transformer are connected to the input terminal of the controller 102. The voltage transformer is used to acquire the voltage of the slip-ring motor 104 and output the acquired voltage to the controller 102; the current transformer is used to acquire the current of the slip-ring motor 104 and output the acquired current to the controller 102.

[0048] like Figure 2 As shown, the aforementioned automatic load testing equipment for frequency converters also includes an AC power supply 107. The output terminal of the AC power supply 107 is connected to the power supply terminal of the frequency converter under test 2 to provide operating power to the frequency converter under test 2. Generally, the AC power supply 107 can be 380V AC.

[0049] In some embodiments of this application, the above-mentioned inverter load automatic detection device further includes a transformer unit 108, the input terminal of which is connected to the output terminal of the AC power supply 107, and the output terminal of which is connected to the power supply terminal of the loading circuit 103.

[0050] It should be noted that the transformer unit 108 is mainly used to convert 380V AC power to 220V AC power to provide operating power for the loading circuit 103. It should be further noted that the power supply terminal of the loading circuit 103 is the power supply terminal of the stepper motor within the loading circuit 103. As a preferred example, the transformer unit 108 can be a transformer.

[0051] In some embodiments of this application, the above-mentioned inverter load automatic detection device further includes a switching power supply module 109. The input terminal of the switching power supply module 109 is connected to the output terminal of the transformer unit 108, and the output terminal of the switching power supply module 109 is connected to the power supply terminal of the touch screen 101, the power supply terminal of the controller 102, the power supply terminal of the first acquisition circuit 105, and the power supply terminal of the second acquisition circuit 106, respectively.

[0052] It should be noted that the aforementioned switching power supply module 109 is mainly used to convert 220V AC power into 24V DC power to supply power to the following devices: touch screen 101, controller 102, ammeter, voltmeter, voltage transformer, and current transformer. It should be further noted that the power supply terminals of the ammeter and voltmeter are the power supply terminals of the first acquisition circuit 105, and the power supply terminals of the voltage transformer and current transformer are the power supply terminals of the second acquisition circuit 106. As a preferred example, the aforementioned switching power supply module 109 can be a conventional 24V switching power supply module.

[0053] In summary, the automatic load testing equipment for frequency converters of this application collects the current and voltage output of the frequency converter under test 2 through the first acquisition circuit 105 and the current and voltage of the slip motor 104 through the second acquisition circuit 106 during the commissioning process. Then, the controller 102 compares the current output of the frequency converter under test 2 with the current of the slip motor 104 and compares the voltage output of the frequency converter under test 2 with the voltage of the slip motor 104, and outputs the results to the touch screen 101 to display the commissioning results of the frequency converter under test 2. This realizes the automation of the frequency converter factory commissioning and achieves the purpose of automatic acquisition, calibration and testing. Compared with the manual commissioning used in the prior art, the testing time is shorter and the accuracy is higher. Therefore, this application improves production efficiency and product quality. At the same time, early measurement after production assembly can avoid production operators from coming into contact with high voltage electricity, reduce the occurrence of production safety accidents and provide personal safety protection for production operators.

[0054] The above description is the preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principles described in this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. An automatic load testing device for frequency converters, characterized in that, include: Touch screen, controller, loading circuit, slip motor, first acquisition circuit and second acquisition circuit; The data terminal of the touchscreen is connected to the first data terminal of the controller, the second data terminal of the controller is connected to the data terminal of the loading circuit, the output terminal of the loading circuit is connected to the first terminal of the slip motor, the second terminal of the slip motor is connected to the output terminal of the inverter under test, the input terminal of the first acquisition circuit is connected to the output terminal of the inverter under test, the input terminal of the second acquisition circuit is connected to the second terminal of the slip motor, and the output terminals of the first acquisition circuit and the second acquisition circuit are both connected to the input terminal of the controller.

2. The automatic load detection equipment for frequency converters according to claim 1, characterized in that, The loading circuit includes an RC buffer unit, a rectifier bridge, a stepper motor, and a voltage regulator mounted on the output shaft of the stepper motor. The control terminal of the stepper motor is the data terminal of the loading circuit. The output terminal of the voltage regulator is connected to the input terminal of the RC buffer unit. The output terminal of the RC buffer unit is connected to the input terminal of the rectifier bridge. The output terminal of the rectifier bridge is the output terminal of the loading circuit.

3. The automatic load detection equipment for frequency converters according to claim 1, characterized in that, The first acquisition circuit includes: an ammeter and a voltmeter; The input terminals of the ammeter and the voltmeter are both connected to the output terminal of the frequency converter under test, and the output terminals of the ammeter and the voltmeter are both connected to the input terminal of the controller.

4. The automatic load detection equipment for frequency converters according to claim 1, characterized in that, The second acquisition circuit includes a voltage transformer and a current transformer; The input terminals of the voltage transformer and the current transformer are both connected to the second terminal of the slip differential motor, and the output terminals of the voltage transformer and the current transformer are both connected to the input terminal of the controller.

5. The automatic load detection equipment for frequency converters according to claim 1, characterized in that, The inverter load automatic testing equipment also includes an AC power supply, the output terminal of which is connected to the power supply terminal of the inverter under test.

6. The automatic load detection equipment for frequency converters according to claim 5, characterized in that, The inverter load automatic detection device also includes a transformer unit, the input terminal of which is connected to the output terminal of the AC power supply, and the output terminal of which is connected to the power supply terminal of the loading circuit.

7. The automatic load detection equipment for frequency converters according to claim 6, characterized in that, The inverter load automatic detection device also includes a switching power supply module. The input terminal of the switching power supply module is connected to the output terminal of the transformer unit, and the output terminal of the switching power supply module is connected to the power supply terminal of the touch screen, the power supply terminal of the controller, the power supply terminal of the first acquisition circuit, and the power supply terminal of the second acquisition circuit, respectively.

8. The automatic load detection equipment for frequency converters according to claim 1, characterized in that, The controller is a central processing unit.

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