Anechoic chamber system suitable for EMC test of new energy automobile

Abstract

The invention discloses a new energy automobile EMC test anechoic chamber system, which relates to the technical field of electromagnetic compatibility test and comprises a grounding flat plate, an artificial network module, a power supply module and a detection analysis module. The grounding flat plate is built in the electric wave darkroom, an equipotential point or an equipotential surface is provided for an EMC test electric wave darkroom system, electrical safety is ensured, electromagnetic interference is prevented, and the size of the grounding flat plate can effectively meet the EMC test requirement of a new energy automobile; the low-voltage artificial network is used for providing a stable impedance environment for the low-voltage power line so as to isolate and measure radio frequency disturbance generated by the low-voltage power line, EMC testing of low-voltage electronic equipment of a new energy automobile is achieved, the high-voltage artificial network is used for providing a stable impedance environment capable of bearing high voltage and large current for the high-voltage power supply, and the EMC testing of the low-voltage electronic equipment of the new energy automobile is achieved. The EMC test of the battery pack of the new energy automobile is realized, and a standard test system comprising low-voltage and high-voltage components is provided.

Description

Technical Field

[0001] The invention belongs to the technical field of electromagnetic compatibility testing, and in particular relates to an anechoic chamber system suitable for EMC testing of new energy vehicles. Background Art

[0002] New energy vehicle EMC (Electromagnetic Compatibility) refers to the ability of electronic equipment or systems in new energy vehicles to operate in accordance with requirements in their electromagnetic environment and not produce intolerable electromagnetic interference to any equipment in its environment. New energy vehicle EMC plays an important role in ensuring vehicle performance, personal safety and compliance with regulatory requirements.

[0003] At present, the design of conventional anechoic chambers does not meet the EMC testing requirements of new energy vehicles and battery packs. There is no electromagnetic compatibility test method for battery packs in China. Neither emission tests nor immunity tests have clear requirements for the test layout and operating status of battery packs. The domestic automotive parts standards GB / T18655 and GB / T17619 related to the electromagnetic compatibility of battery packs respectively stipulate the emission test and immunity test requirements for automotive parts. However, the standards are mainly for 12 V / 24 V electrical systems and do not involve high-voltage components of electric vehicles. High-voltage components cannot be tested according to the above standards. The industry standard QC / T 897-2011 is a description of the test technical conditions for electric vehicle power battery management systems. However, for electromagnetic compatibility testing, the standard simply stipulates that the requirements of GB / T 17619 should be met, and GB / T17619 does not have any provisions for high-voltage component test methods. The main standards for reference to automotive component test methods in the world, including ECE R10, ISO7637 and ISO 11452 series standards, do not have technical documents for high-voltage components of electric vehicles. Based on the above reasons, the present invention proposes an anechoic chamber system suitable for EMC testing of new energy vehicles. Summary of the invention

[0004] The purpose of the present invention is to provide an anechoic chamber system suitable for EMC testing of new energy vehicles in order to address the problem that the prior art cannot meet the electromagnetic compatibility test requirements of battery packs.

[0005] The present invention is realized by the following technical scheme: an anechoic chamber system suitable for EMC testing of new energy vehicles, comprising: The grounding plate is a platform for EMC testing of new energy vehicles. It provides an equipotential point or equipotential surface for the EMC test anechoic chamber system, ensures electrical safety and prevents electromagnetic interference, and improves the accuracy of electromagnetic compatibility testing of new energy vehicles. Artificial network module, used to connect the device under test and the test system, to prevent the device under test from generating radio frequency electromagnetic interference and ensure the accuracy of the test results; A power module is used to provide power to the EMC test anechoic chamber system. The power module is connected to the artificial network module through a filter; The detection and analysis module is used to detect and analyze the operating status of the EMC test anechoic chamber system and the data of the equipment under test.

[0006] Preferably, the grounding plate comprises a copper plate, a grounding copper strip and an insulating bracket. The copper plate has a size of 4,000 mm × 1,500 mm and a thickness greater than or equal to 0.5 mm. The spacing between the grounding copper strips is less than 300 mm, and the maximum length-to-width ratio of the grounding copper strips is 7:1.

[0007] Preferably, the artificial network module includes a low-voltage artificial network and a high-voltage artificial network, the low-voltage artificial network is connected to the device under test through a low-voltage cable, and the high-voltage artificial network is connected to the device under test through a high-voltage cable; The low-voltage artificial network is used to provide a stable impedance environment for the low-voltage power line to isolate and measure the radio frequency interference generated by it. The low-voltage power line is equipped with a 12 V / 24 V artificial network; The high-voltage artificial network is used to provide a stable impedance environment capable of withstanding high voltage and high current for the high-voltage power supply. The high-voltage power supply line is equipped with a 1 000 V / 800 A artificial network.

[0008] Preferably, the length of the low-voltage cable parallel to the edge of the grounding plate should be (1,500±75) mm, and the high-voltage wire harness and the low-voltage wire harness are parallel and the distance between them is 100 mm.

[0009] Preferably, the power supply module comprises a low voltage power supply and a high voltage power supply; The low-voltage power supply is used to supply power to the low-voltage artificial network, and the low-voltage power supply is installed inside the radio wave darkroom; The high-voltage power supply is used to supply power to the high-voltage artificial network, and the high-voltage power supply is arranged outside the anechoic chamber.

[0010] Preferably, the detection and analysis module includes an analyzer and a measurement receiver, and the analyzer and the measurement receiver are both installed outside the radio wave darkroom; The analyzer is used to analyze and process the operating data of the device under test, and the analyzer is connected to the device under test via a CAN cable, and a photoelectric converter is installed on the CAN cable; The measuring receiver is used to receive data in the anechoic chamber, and the measuring receiver is connected to a low-voltage artificial network via a coaxial cable.

[0011] Compared with the prior art, the present invention has the following advantages: 1. The present invention provides an equipotential point or equipotential surface for the EMC test anechoic chamber system by building a grounding plate in the anechoic chamber, thereby ensuring electrical safety and preventing electromagnetic interference, so that the size of the grounding plate can effectively meet the needs of EMC testing of new energy vehicles; 2. The present invention utilizes a low-voltage artificial network to provide a stable impedance environment for a low-voltage power line to isolate and measure the radio frequency interference generated by it, thereby realizing EMC testing of low-voltage electronic equipment of new energy vehicles. It utilizes a high-voltage artificial network to provide a high-voltage power source with a stable impedance environment that can withstand high voltage and high current, thereby realizing EMC testing of battery packs of new energy vehicles, and provides a standard test system including low-voltage and high-voltage components. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a block diagram of an anechoic chamber system suitable for EMC testing of new energy vehicles. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0014] For examples, see Figure 1 , an anechoic chamber system suitable for EMC testing of new energy vehicles, including: The grounding plate is a platform for EMC testing of new energy vehicles. It provides an equipotential point or equipotential surface for the EMC test anechoic chamber system, ensures electrical safety and prevents electromagnetic interference, and improves the accuracy of electromagnetic compatibility testing of new energy vehicles. In this specific embodiment, the size of the battery pack used for the test is 1.5 m×1 m; therefore, the grounding plate includes a copper plate, a grounding copper strip and an insulating bracket. The copper plate has a size of 4,000 mm×1,500 mm and a thickness of 0.5 mm. The spacing between the grounding copper strips is 300 mm, and the length-to-width ratio of the grounding copper strips is 7:1. Through the above settings, the grounding plate is suitable for new energy vehicle battery packs.

[0015] Artificial network module, used to connect the device under test and the test system, to prevent the device under test from generating radio frequency electromagnetic interference and ensure the accuracy of the test results; The artificial network module includes a low-voltage artificial network and a high-voltage artificial network, the low-voltage artificial network is connected to the device under test through a low-voltage cable, and the high-voltage artificial network is connected to the device under test through a high-voltage cable; The low-voltage artificial network is used to provide a stable impedance environment for the low-voltage power line to isolate and measure the radio frequency interference generated by it. The low-voltage power line is equipped with a 12 V / 24 V artificial network; The high-voltage artificial network is used to provide a stable impedance environment capable of withstanding high voltage and high current for the high-voltage power supply. The high-voltage power supply line is equipped with a 1 000 V / 800 A artificial network.

[0016] The length of the low-voltage cable parallel to the edge of the grounding plate is 1,575 mm, and the high-voltage wire harness and the low-voltage wire harness are parallel and 100 mm apart.

[0017] In this specific embodiment, for the EMC test of new energy vehicles, since the electrical system of new energy vehicles or some low-voltage electronic equipment has a low voltage level, generally around 12V or 24V, the actual working environment of the low-voltage power supply can be simulated by using a low-voltage artificial network, and the wireless interference generated can be measured; and for the battery pack of new energy vehicles, which has a higher voltage level, the test environment can be simulated through a 1,000 V / 800 A artificial network of a high-voltage artificial network to improve the accuracy of the test.

[0018] A power module is used to provide power to the EMC test anechoic chamber system. The power module is connected to the artificial network module through a filter; Wherein, the power supply module includes a low-voltage power supply and a high-voltage power supply; The low-voltage power supply is used to supply power to the low-voltage artificial network, and the low-voltage power supply is installed inside the radio wave darkroom; The high-voltage power supply is used to supply power to the high-voltage artificial network, and the high-voltage power supply is arranged outside the anechoic chamber.

[0019] The detection and analysis module is used to detect and analyze the operating status of the EMC test anechoic chamber system and the data of the equipment under test; Wherein, the detection and analysis module includes an analyzer and a measurement receiver, and the analyzer and the measurement receiver are both installed outside the radio wave darkroom; The analyzer is used to analyze and process the operating data of the device under test, and the analyzer is connected to the device under test via a CAN cable, and a photoelectric converter is installed on the CAN cable; The measuring receiver is used to receive data in the anechoic chamber, and the measuring receiver is connected to a low-voltage artificial network via a coaxial cable.

[0020] In this specific embodiment, for emission tests, the emission uses the limit values ​​of GB / T 18655-2010.

[0021] The working process and beneficial effects of the present invention are as follows: The present invention provides an equipotential point or equipotential surface for an EMC test anechoic chamber system by building a grounding plate in an anechoic chamber, thereby ensuring electrical safety and preventing electromagnetic interference, so that the size of the grounding plate can effectively meet the needs of the EMC test of new energy vehicles. Then, on the basis of the grounding platform, a low-voltage artificial network is used to provide a stable impedance environment for a low-voltage power line to isolate and measure the radio frequency interference generated by the low-voltage power line, thereby realizing the EMC test of the low-voltage electronic equipment of the new energy vehicle. A high-voltage artificial network is used to provide a high-voltage power supply with a stable impedance environment capable of withstanding high voltage and large current, thereby realizing the EMC test of the battery pack of the new energy vehicle. A standard test system including low-voltage and high-voltage components is provided, thereby improving the versatility of the test system. Then, a detection and analysis module is used to detect and analyze the operating state of the EMC test anechoic chamber system and the data of the tested device, thereby completing the EMC test of the new energy vehicle.

[0022] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0023] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A radio wave darkroom system suitable for EMC testing of new energy vehicles, characterized in that: include: The grounding plate is a platform for EMC testing of new energy vehicles. It provides an equipotential point or equipotential surface for the EMC test anechoic chamber system, ensures electrical safety and prevents electromagnetic interference, and improves the accuracy of electromagnetic compatibility testing of new energy vehicles. Artificial network module, used to connect the device under test and the test system, to prevent the device under test from generating radio frequency electromagnetic interference and ensure the accuracy of the test results; A power module is used to provide power to the EMC test anechoic chamber system. The power module is connected to the artificial network module through a filter; The detection and analysis module is used to detect and analyze the operating status of the EMC test anechoic chamber system and the data of the equipment under test.

2. According to claim 1, a darkroom system suitable for EMC testing of new energy vehicles is characterized in that: The grounding plate includes a copper plate, a grounding copper strip and an insulating bracket. The copper plate has a size of 4,000 mm×1,500 mm and a thickness greater than or equal to 0.5 mm. The spacing between the grounding copper strips is less than 300 mm, and the maximum length-to-width ratio of the grounding copper strips is 7:

1.

3. The anechoic chamber system for EMC testing of new energy vehicles according to claim 2 is characterized in that: The human network module includes a low-voltage artificial network and a high-voltage artificial network, the low-voltage artificial network is connected to the device under test through a low-voltage cable, and the high-voltage artificial network is connected to the device under test through a high-voltage cable; The low-voltage artificial network is used to provide a stable impedance environment for the low-voltage power line to isolate and measure the radio frequency interference generated by it. The low-voltage power line is equipped with a 12 V / 24 V artificial network; The high-voltage artificial network is used to provide a stable impedance environment capable of withstanding high voltage and high current for the high-voltage power supply. The high-voltage power supply line is equipped with a 1 000 V / 800 A artificial network.

4. The anechoic chamber system for EMC testing of new energy vehicles according to claim 3 is characterized in that: The length of the low-voltage cable parallel to the edge of the grounding plate should be (1,500±75) mm, and the high-voltage wire harness and the low-voltage wire harness are parallel and 100 mm apart.

5. The anechoic chamber system for EMC testing of new energy vehicles according to claim 4 is characterized in that: The power supply module includes a low voltage power supply and a high voltage power supply; The low-voltage power supply is used to supply power to the low-voltage artificial network, and the low-voltage power supply is installed inside the radio wave darkroom; The high-voltage power supply is used to supply power to the high-voltage artificial network, and the high-voltage power supply is arranged outside the anechoic chamber.

6. The anechoic chamber system for EMC testing of new energy vehicles according to claim 5, characterized in that: The detection and analysis module includes an analyzer and a measurement receiver, and the analyzer and the measurement receiver are both installed outside the radio wave darkroom; The analyzer is used to analyze and process the operating data of the device under test, and the analyzer is connected to the device under test via a CAN cable, and a photoelectric converter is installed on the CAN cable; The measuring receiver is used to receive data in the anechoic chamber, and the measuring receiver is connected to a low-voltage artificial network via a coaxial cable.

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