Equipment for testing harmonic current of switching power supply of electronic product

Abstract

The invention relates to the technical field of electronic product testing, in particular to electronic product switching power supply harmonic current testing equipment which comprises a shell, the inner wall of the shell is fixedly connected with a metal shell, the interior of the metal shell is fixedly connected with a carbon nano plate, the inner wall of the metal shell is fixedly connected with a copper shell, and the interior of the copper shell is provided with a testing device. The inner wall of the copper shell is fixedly connected with a placing plate and a signal filter, a power supply filter is arranged above the placing plate, and the inner top wall of the copper shell is fixedly connected with a metal shielding seat. According to the electronic product switching power supply harmonic current test equipment, the metal shell, the shielding door, the carbon nano-plate and the copper shell are arranged, the test device can be wrapped in the metal shell, the metal material of the metal shell is utilized, high strength can be achieved, an electric field and a magnetic field can be effectively shielded, meanwhile, the carbon nano-plate can absorb and reflect electromagnetic waves, and the test efficiency is improved. And the copper shell has a good shielding effect on high-frequency electromagnetic interference due to excellent conductivity.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic product testing, and in particular to a device for testing harmonic current of a switching power supply of an electronic product. Background Art

[0002] The harmonic current test equipment for switching power supplies of electronic products is a special instrument used to measure the harmonic currents generated by switching power supplies. In the process of converting AC power to DC power, the switching power supply will generate harmonic currents due to its nonlinear working characteristics. These harmonic currents may interfere with the power grid and affect the normal operation of other equipment. It may also cause electromagnetic compatibility problems. Therefore, accurately testing the harmonic current of the switching power supply is crucial to ensure that electronic products comply with relevant standards and work properly. The main components include current sensors, signal conditioning circuits, analog-to-digital converters, data processing units, display and output interfaces, etc.

[0003] Regarding the above-mentioned related technologies, the inventors believe that the following defects exist: the equipment has limited anti-interference ability when in use. In the actual test environment, there may be various electromagnetic interferences, such as electromagnetic radiation from other electrical equipment, interference from the power grid, etc. Although the test equipment itself has certain anti-interference measures, such as the filtering link in the signal conditioning circuit, in a strong interference environment, these measures may not be sufficient to completely eliminate the impact of interference. At the same time, the equipment is easily affected by temperature. For high-precision testing tasks such as harmonic current testing, excessively high or low temperatures may cause the measurement accuracy of the test equipment to decrease, because the reference signals such as the reference voltage and reference current inside the equipment may drift with temperature. Therefore, a person skilled in the art provides a harmonic current testing device for switching power supplies of electronic products to solve the problems raised in the above-mentioned background technology. Summary of the Invention

[0004] In order to solve the problems that the anti-interference ability of the test equipment itself is weak and the test environment temperature affects the test accuracy, the present invention provides a harmonic current test equipment for the switching power supply of an electronic product.

[0005] The present invention provides a device for testing harmonic currents of switching power supplies for electronic products, which adopts the following technical solution: a device for testing harmonic currents of switching power supplies for electronic products, comprising a housing, an inner wall of the housing fixedly connected to a metal shell, an interior of the metal shell fixedly connected to a carbon nanoplate, an inner wall of the metal shell fixedly connected to a copper shell, an interior of the copper shell provided with a testing device, an inner wall of the copper shell respectively fixedly connected to a placement plate and a signal filter, a power filter provided above the placement plate, an inner top wall of the copper shell fixedly connected to a metal shielding seat, a bottom surface of the metal shielding seat fixedly connected to a lighting lamp, a left side of the metal shell movably hinged to a shielding door, a right side of the shielding door in contact with the left sides of the metal shell, the carbon nanoplate, and the copper shell; A temperature sensor is provided above the shell, and the sensing end of the temperature sensor passes through the shell and extends to the top of the metal shell. A display and a controller are respectively provided on the front of the shell. A refrigeration pipe rack is provided inside the shell, and two groups of electric heating pipes are fixedly connected to the inner wall of the shell. A refrigeration module is provided on the right side of the shell, and the output end of the refrigeration module is fixedly connected to a three-way pipe. The left end of the three-way pipe passes through the shell and is fixedly connected to the outer surface of the refrigeration pipe rack.

[0006] Optionally, two sets of rotating racks are fixedly connected to the bottom surface of the shell, and the inner wall of each rotating rack is rotatably connected to a rotating wheel.

[0007] Optionally, a connecting frame is fixedly connected to the left side of the shielding door, and a handle is fixedly connected to the left side of the connecting frame.

[0008] Optionally, a fixing plate is fixedly connected to the bottom surface of the testing device, the bottom surface of the fixing plate contacts the inner bottom wall of the copper shell, and two groups of fixing pins are arranged above the fixing plate, and the bottom end of each fixing pin passes through the fixing plate and extends to the interior of the copper shell.

[0009] Optionally, an insulating plate is fixedly connected to the back of the power filter, and the back of the insulating plate is fixedly connected to the inner wall of the copper shell.

[0010] Optionally, the backs of the display and the controller are fixedly connected to a mounting plate, and the back of the mounting plate is fixedly connected to the front of the housing.

[0011] Optionally, two groups of support blocks are fixedly connected to the inner bottom wall of the outer shell, and the upper surface of each support block is fixedly connected to the bottom surface of the metal shell.

[0012] Optionally, two groups of reinforcement frames are fixedly connected to the outer surface of the refrigeration pipe rack, and a side surface of each group of reinforcement frames that is away from each other is fixedly connected to the inner wall of the shell.

[0013] Optionally, a support plate is fixedly connected to the bottom surface of the refrigeration module, and the right side of the support plate is fixedly connected to the left side of the shell.

[0014] Optionally, a shielding protective shell is fixedly connected to the upper surface of the support plate, and ventilation holes arranged at equal distances are opened on the right side of the shielding protective shell. The shielding protective shell is sleeved on the outside of the refrigeration module.

[0015] In summary, the present invention has the following beneficial technical effects: The present invention is provided with a metal shell, a shielding door, a carbon nanoplate and a copper shell, which can wrap the test device inside. The metal material of the metal shell has high strength and can effectively shield the electric field and magnetic field. At the same time, the carbon nanoplate can absorb and reflect electromagnetic waves, and the copper shell has excellent conductivity and has a good shielding effect on high-frequency electromagnetic interference. Then, through the signal filter and the power filter, the electromagnetic interference in the power line can be processed and the signal line can be filtered, so that the test device can be placed in an anti-interference environment for testing. Then, through the refrigeration module and the three-way pipe and the refrigeration pipe rack, the interior of the shell can be cooled, and the interior of the shell can be heated and increased by using the electric heating pipe. At the same time, through the temperature sensor and the display, the temperature change in the shell can be observed in real time. Through the controller, the appropriate electric heating pipe or refrigeration module can be turned on to cool or increase the temperature, so that the test device can be operated in a constant temperature environment during testing, which can further improve the accuracy of the test device during testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of a harmonic current test device for a switching power supply of an electronic product; Figure 2 This is a three-dimensional cross-sectional view of the outer shell of a harmonic current testing device for a switching power supply of an electronic product; Figure 3 This is a three-dimensional structural diagram of a test device in a harmonic current test device for a switching power supply of an electronic product; Figure 4 This is a schematic diagram of the three-dimensional structure of a fixing plate in a harmonic current testing device for a switching power supply of an electronic product; Figure 5 This is a three-dimensional structural diagram of a lighting lamp in a harmonic current testing device for a switching power supply of an electronic product; Figure 6 This is a three-dimensional structural diagram of an electric heating tube in a harmonic current testing device for a switching power supply of an electronic product; Figure 7 This is a right-side structural schematic diagram of a three-dimensional protective shell in a harmonic current testing device for a switching power supply of an electronic product; Figure 8This is a right-side structural schematic diagram of a refrigeration module in a harmonic current testing device for a switching power supply of an electronic product.

[0017] Figure numerals: 1. outer shell; 2. rotating wheel; 3. mounting plate; 4. display; 5. controller; 6. temperature sensor; 7. metal shell; 8. handle; 9. refrigeration pipe rack; 10. carbon nanoplate; 11. testing device; 12. copper shell; 13. fixing plate; 14. fixing pin; 15. placement plate; 16. signal filter; 17. insulating plate; 18. power filter; 19. lighting lamp; 20. protective shell; 21. electric heating tube; 22. support block; 23. vent; 24. reinforcement frame; 25. support plate; 26. refrigeration module; 27. three-way pipe; 28. metal shielding seat; 29. ​​shielding door; 30. rotating frame; 31. connecting frame. DETAILED DESCRIPTION

[0018] The following is combined with Figure 1-8 The present invention is described in further detail. Example 1

[0019] Please pay attention to Figure 1-8 The present invention provides a technical solution: a harmonic current test device for a switching power supply of an electronic product, comprising a housing 1, a metal shell 7 fixedly connected to the inner wall of the housing 1, a carbon nanoplate 10 fixedly connected to the interior of the metal shell 7, a copper shell 12 fixedly connected to the inner wall of the metal shell 7, a test device 11 arranged inside the copper shell 12, a placement plate 15 and a signal filter 16 fixedly connected to the inner wall of the copper shell 12, a power filter 18 arranged above the placement plate 15, a metal shielding seat 28 fixedly connected to the inner top wall of the copper shell 12, and a lighting lamp fixedly connected to the bottom surface of the metal shielding seat 28. 19. A shielding door 29 is movably hinged on the left side of the metal shell 7. The right side of the shielding door 29 contacts the left sides of the metal shell 7, the carbon nanoplate 10, and the copper shell 12. The carbon nanoplate 10 has good electrical conductivity. Nanocarbon materials such as carbon nanotubes have high electron mobility. After being constructed into a nanocarbon plate, an effective conductive path can be formed. When external electromagnetic waves irradiate the nanocarbon plate, due to its conductive properties, an induced current will be generated on the surface. This induced current will generate a magnetic field opposite to the incident electromagnetic wave, thereby reflecting the electromagnetic wave and playing the role of electromagnetic shielding. A temperature sensor 6 is provided above the shell 1. The sensing end of the temperature sensor 6 passes through the shell 1 and extends to the top of the metal shell 7. A display 4 and a controller 5 are respectively provided on the front of the shell 1. A refrigeration pipe rack 9 is provided inside the shell 1. Two groups of electric heating pipes 21 are fixedly connected to the inner wall of the shell 1. A refrigeration module 26 is provided on the right side of the shell 1. The output end of the refrigeration module 26 is fixedly connected to a tee pipe 27. The left end of the tee pipe 27 passes through the shell 1 and is fixedly connected to the outer surface of the refrigeration pipe rack 9. The electric heating pipe 21 is made by loading an electric heating wire into a seamless metal tube, carbon steel tube, titanium tube, stainless steel tube or copper tube, filling the gap with magnesium oxide powder with good thermal conductivity and insulation, and then shrinking the tube, and then processing it into various shapes required by the user. Example 2

[0020] Please pay attention to Figure 1 Two sets of rotating frames 30 are fixedly connected to the bottom surface of the shell 1, and the inner wall of each rotating frame 30 is rotatably connected to the rotating wheel 2. Through the rotating frame 30, the rotating wheel 2 can be driven to be fixed on the shell 1, so that the shell 1 can be easily moved. The left side of the shielding door 29 is fixedly connected to a connecting frame 31, and the left side of the connecting frame 31 is fixedly connected to a handle 8. The connecting frame 31 can conveniently connect the handle 8 to the shielding door 29, and the handle 8 can be used to conveniently open or close the shielding door 29. At the same time, the shielding door 29 is a door body made of metal material, and an electromagnetic sealing device conductive rubber strip is installed between the door and the door frame. Example 3

[0021] Please pay attention to Figure 2 、 Figure 3 、 Figure 4 and Figure 5 The bottom surface of the test device 11 is fixedly connected to a fixing plate 13, and the bottom surface of the fixing plate 13 contacts the inner bottom wall of the copper shell 12. Two groups of fixing pins 14 are arranged above the fixing plate 13. The bottom end of each fixing pin 14 passes through the fixing plate 13 and extends to the inside of the copper shell 12. The fixing pins 14 connect and fix the fixing plate 13 to the copper shell 12, so that the test device 11 can be used stably in the copper shell 12. The back of the power filter 18 is fixedly connected to an insulating plate 17, and the back of the insulating plate 17 is fixedly connected to the inner wall of the copper shell 12. The insulating plate 17 can fix the power filter 18 on the copper shell 12 and play a protective role. At the same time, the power filter 18 is mainly used to deal with electromagnetic interference in the power line. Example 4

[0022] Please pay attention to Figure 1 、 Figure 2 and Figure 7The backs of the display 4 and the controller 5 are fixedly connected to a mounting plate 3. The back of the mounting plate 3 is fixedly connected to the front of the shell 1. The mounting plate 3 fixes the display 4 and the controller 5 on the shell 1. At the same time, the display 4 is a display tool that displays certain electronic files on the screen through a specific transmission device and then reflects them to the human eye. The controller 5 refers to a master command device that controls the start, speed regulation, braking and reverse of the motor by changing the wiring of the main circuit or control circuit and changing the resistance value in the circuit in a predetermined sequence. Two groups of support blocks 22 are fixedly connected to the inner bottom wall of the shell 1. The upper surface of each support block 22 is fixedly connected to the bottom surface of the metal shell 7. The outer surface of the refrigeration pipe rack 9 is fixedly connected to two groups of reinforcement frames 24. The side of each group of reinforcement frames 24 away from each other is fixedly connected to the inner wall of the shell 1. Through the support blocks 22 and the reinforcement frames 24, the copper shell 12 and the refrigeration pipe rack 9 can be connected and fixed to the shell 1, so that the shell 1, the copper shell 12 and the refrigeration pipe rack 9 are firm when in use. Example 5

[0023] Please pay attention to Figure 6 、 Figure 7 and Figure 8 The bottom surface of the refrigeration module 26 is fixedly connected to a support plate 25, the right side of the support plate 25 is fixedly connected to the left side of the shell 1, and the upper surface of the support plate 25 is fixedly connected to a shielding protective shell 20. The right side of the shielding protective shell 20 is provided with equidistantly arranged vents 23. The shielding protective shell 20 is sleeved on the outside of the refrigeration module 26. The protective shell 20 and the refrigeration module 26 can be fixed on the shell 1 for use through the support plate 25. At the same time, the protective shell 20 can protect the refrigeration module 26 inside and use the vents 23 for ventilation and heat dissipation, thereby extending the service life of the refrigeration module 26. The refrigeration module 26 is composed of a compressor, a condenser, an expansion valve, an evaporator and a control system.

[0024] The implementation principle of the harmonic current test device for the switching power supply of an electronic product according to the embodiment of the present invention is as follows: when in use, first, the device is moved to a suitable use position by cooperating with the rotating wheel 2 through the rotating frame 30, and the shielding door 29 is opened by cooperating with the connecting frame 31 through the handle 8, and the lighting lamp 19 is turned on at the same time, and the switch to be tested is placed on the placement plate 15, and then the wires and signal lines are connected to the inside of the copper shell 12 through the reserved openings of the shell 1, the metal shell 7, the copper shell 12 and the carbon nanoplate 10, so that the electrical equipment in the copper shell 12 is connected, and at the same time, the test device 11 and the switch are connected for testing. When the test device 1 During the test, the shielding door 29 is closed, and the metal material of the outer shell 1 and the metal shell 7 is used to shield the electric field and the magnetic field. At the same time, the carbon nanoplate 10 is used to absorb and reflect electromagnetic radiation, and the innermost copper shell 12 is used to shield high-frequency electromagnetic interference. At the same time, the power line is first connected to the power filter 18, and then to the test device 11, so that the power filter 18 can shield the electromagnetic interference on the power line. When wiring, the signal line of the external signal source is connected to the input end of the signal filter 16, and the output end of the signal filter 16 is connected to the test device 11, so that the signal filter 16 can shield the electromagnetic interference entering the copper shell 1. 2, so that the test device 11 can be in an anti-interference environment for testing, and during the test, the temperature sensor 6 is turned on, and the temperature inside the housing 1 is sensed in real time by the opening of the temperature sensor 6. At the same time, the signal is transmitted to the display 4 through the wire for display, so that the staff can observe and judge. When the temperature inside the housing 1 is high or low, and the test device 11 cannot be in a suitable temperature working range, the signal filter 16 and the electric heating tube 21 are turned on through the wire. By turning on the electric heating tube 21, electric heating is performed, thereby heating the inside of the housing 1 to make the test device 11 The working environment temperature of the device 11 rises. When the temperature is low, the signal filter 16 is turned on to cool the air and transmit it to the refrigeration pipe rack 9 through the three-way pipe 27, so that the refrigeration pipe rack 9 lowers the temperature inside the shell 1, thereby lowering the working environment temperature of the test device 11. At the same time, when the test device 11 is working and adjusting the temperature, the temperature display of the display 4 is always observed. When the temperature reaches the appropriate range, the electric heating tube 21 and the signal filter 16 are turned off in time, so that the test device 11 can further work against temperature and external interference, thereby improving the accuracy of the test of the test device 11.

[0025] The above are all preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A harmonic current testing device for a switching power supply of an electronic product, comprising a housing (1), characterized in that: The inner wall of the outer shell (1) is fixedly connected to a metal shell (7), the interior of the metal shell (7) is fixedly connected to a carbon nanoplate (10), the inner wall of the metal shell (7) is fixedly connected to a copper shell (12), the interior of the copper shell (12) is provided with a testing device (11), the inner wall of the copper shell (12) is respectively fixedly connected to a placement plate (15) and a signal filter (16), a power filter (18) is provided above the placement plate (15), the inner top wall of the copper shell (12) is fixedly connected to a metal shielding seat (28), the bottom surface of the metal shielding seat (28) is fixedly connected to an illuminating lamp (19), the left side surface of the metal shell (7) is movably hinged to a shielding door (29), the right side surface of the shielding door (29) is in contact with the left sides of the metal shell (7), the carbon nanoplate (10) and the copper shell (12); A temperature sensor (6) is arranged above the outer shell (1), and the sensing end of the temperature sensor (6) passes through the outer shell (1) and extends to the top of the metal shell (7). A display (4) and a controller (5) are arranged on the front of the outer shell (1), respectively. A refrigeration pipe rack (9) is arranged inside the outer shell (1), and two groups of electric heating pipes (21) are fixedly connected to the inner wall of the outer shell (1). A refrigeration module (26) is arranged on the right side of the outer shell (1), and the output end of the refrigeration module (26) is fixedly connected to a three-way pipe (27), and the left end of the three-way pipe (27) passes through the outer shell (1) and is fixedly connected to the outer surface of the refrigeration pipe rack (9).

2. The electronic product switching power supply harmonic current testing device according to claim 1, characterized in that: Two groups of rotating frames (30) are fixedly connected to the bottom surface of the outer shell (1), and the inner wall of each rotating frame (30) is rotatably connected to a rotating wheel (2).

3. The electronic product switching power supply harmonic current testing device according to claim 1, characterized in that: A connecting frame (31) is fixedly connected to the left side of the shielding door (29), and a handle (8) is fixedly connected to the left side of the connecting frame (31).

4. The electronic product switching power supply harmonic current test equipment according to claim 1, characterized in that: A fixing plate (13) is fixedly connected to the bottom surface of the test device (11), the bottom surface of the fixing plate (13) is in contact with the inner bottom wall of the copper shell (12), two groups of fixing pins (14) are arranged above the fixing plate (13), and the bottom end of each fixing pin (14) passes through the fixing plate (13) and extends to the inside of the copper shell (12).

5. The electronic product switching power supply harmonic current testing device according to claim 1, characterized in that: An insulating plate (17) is fixedly connected to the back side of the power filter (18), and the back side of the insulating plate (17) is fixedly connected to the inner wall of the copper shell (12).

6. The electronic product switching power supply harmonic current test equipment according to claim 1, characterized in that: The backs of the display (4) and the controller (5) are fixedly connected to a mounting plate (3), and the back of the mounting plate (3) is fixedly connected to the front of the housing (1).

7. The electronic product switching power supply harmonic current test equipment according to claim 1, characterized in that: Two groups of support blocks (22) are fixedly connected to the inner bottom wall of the outer shell (1), and the upper surface of each support block (22) is fixedly connected to the bottom surface of the metal shell (7).

8. The electronic product switching power supply harmonic current test equipment according to claim 1, characterized in that: Two groups of reinforcement frames (24) are fixedly connected to the outer surface of the refrigeration pipe rack (9), and a side surface of each group of reinforcement frames (24) that is away from each other is fixedly connected to the inner wall of the outer shell (1).

9. The electronic product switching power supply harmonic current testing device according to claim 1, characterized in that: The bottom surface of the refrigeration module (26) is fixedly connected to a support plate (25), and the right side surface of the support plate (25) is fixedly connected to the left side surface of the outer shell (1).

10. The electronic product switching power supply harmonic current testing device according to claim 9, characterized in that: The upper surface of the support plate (25) is fixedly connected to a shielding protective shell (20), the right side of the shielding protective shell (20) is provided with equidistantly arranged ventilation holes (23), and the shielding protective shell (20) is sleeved on the outside of the refrigeration module (26).

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