Audio power amplifier electromagnetic compatibility test equipment and vehicle

Abstract

The utility model provides an audio power amplifier electromagnetic compatibility test device and a vehicle, and relates to the technical field of testing, a digital signal processing chip is connected with an automobile audio bus chip, and a sound source signal generated by the digital signal processing chip can be sent to the automobile audio bus chip; the automobile audio bus chip converts the sound source signal into an A2B signal and transmits the A2B signal to the audio power amplifier to be tested through the automobile audio bus interface. By introducing the digital signal processing chip, sound source signals can be automatically generated, external sound source input is not needed, the design of the audio power amplifier electromagnetic compatibility test equipment is simplified, and the EMC problems such as signal crosstalk caused by interface exposure are prevented from influencing the EMC test result of the audio power amplifier to be tested. The stability and reliability of equipment are improved, the risk of electromagnetic interference is reduced, and the high standard of EMC is ensured. In addition, equipment required by testing can be reduced, the testing complexity is reduced, and the testing cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to test technical field especially relates to an audio power amplifier electromagnetic compatibility test equipment and vehicle. BACKGROUND

[0002] In the rapid development process of the automobile industry, with the continuous development of technology, people's demand for entertainment, communication and automobile audio system is also higher and higher, and the importance and proportion of automotive audio bus (Automotive Audio Bus, A2B) technology as an efficient solution for audio transmission in the automobile information entertainment experience are indeed increasing. At the same time, as a widely used communication protocol in automobiles, the controller area network bus (Controller Area Network, CAN) protocol plays an important role in vehicle network with its high reliability and real-time performance.

[0003] However, with the increase in the number of vehicle-mounted electronic devices and the complication of functions, the electromagnetic environment becomes more complex, which puts higher requirements on the electromagnetic compatibility (Electromagnetic Compatibility, EMC) of vehicle-mounted devices.

[0004] Vehicle-mounted power amplifier (i.e. vehicle-mounted audio power amplifier) must meet strict EMC test standards to ensure that it can still work normally under various electromagnetic interferences and will not interfere with other vehicle-mounted systems.

[0005] As shown in Figure 1 , in the traditional vehicle-mounted power amplifier EMC test scheme, a computer (Personal Computer, PC), a universal serial bus (Universal Serial Bus, USB) to a CAN protocol with flexible data rate (Controller Area Network with Flexible Data-rate, CAN FD) interface converter, a CAN FD optoelectronic transceiver on the computer side, a CAN FD optoelectronic transceiver on the side of the vehicle-mounted power amplifier to be tested, a vehicle-mounted power amplifier to be tested and an A2B box are required, the CAN FD optoelectronic transceiver on the computer side is connected with the CAN FD optoelectronic transceiver on the side of the vehicle-mounted power amplifier to be tested through an optical fiber line, the CAN FD optoelectronic transceiver on the side of the vehicle-mounted power amplifier to be tested is connected with the vehicle-mounted power amplifier to be tested through a CAN line, and the A2B box is connected through an A2B line.

[0006] In the traditional vehicle-mounted power amplifier EMC test scheme, many devices are required for testing, which increases the test complexity, and a PC is required to generate a sound source signal, which may cause EMC problems such as signal crosstalk caused by interface exposure. UTILITY MODEL CONTENTS

[0007] The utility model provides a kind of audio power amplifier electromagnetic compatibility test equipment and vehicle, to solve the defects existing in relevant techniques.

[0008] The utility model provides a kind of audio power amplifier electromagnetic compatibility test equipment, comprising: digital signal processing chip, automobile audio bus chip and automobile audio bus interface;

[0009] The digital signal processing chip is connected with the automobile audio bus chip;

[0010] The digital signal processing chip is used to generate sound source signal;

[0011] The automobile audio bus chip is used to be connected with the audio power amplifier to be tested by the automobile audio bus interface.

[0012] According to the utility model provides a kind of audio power amplifier electromagnetic compatibility test equipment, still include: change-over switch and multiple capacitors of different capacitance;

[0013] The automobile audio bus chip is connected with one end of the multiple capacitors by the change-over switch, and the other end of the multiple capacitors is all grounded;

[0014] The change-over switch is used to switch any capacitor in the multiple capacitors to be connected between the automobile audio bus chip and ground.

[0015] According to the utility model provides a kind of audio power amplifier electromagnetic compatibility test equipment, the change-over switch is dial switch;

[0016] The dial switch includes multiple switch units;

[0017] The multiple switch units are connected one by one with the multiple capacitors.

[0018] According to the utility model provides a kind of audio power amplifier electromagnetic compatibility test equipment, still include: controller area network wake-up circuit, the controller area network wake-up circuit includes microcontroller chip and controller area network bus chip;

[0019] The microcontroller chip is connected with the digital signal processing chip and the controller area network bus chip respectively;The microcontroller chip is built-in controller area network wake-up message;

[0020] The controller area network bus chip is used to be connected with the audio power amplifier to be tested.

[0021] The digital signal processing chip, the automobile audio bus chip, the microcontroller chip and the controller area network bus chip are integrated on a printed circuit board.

[0022] The audio power amplifier electromagnetic compatibility test equipment further comprises a power supply chip, and the power supply chip is connected with the power supply.

[0023] The power supply chip is used for converting the power supply voltage of the power supply into a target voltage and outputting.

[0024] The audio power amplifier electromagnetic compatibility test equipment further comprises a box body, and the box body comprises a first cavity and a second cavity.

[0025] The digital signal processing chip and the automobile audio bus chip are integrated on a printed circuit board, and the printed circuit board is arranged in the first cavity.

[0026] The power supply is arranged in the second cavity.

[0027] The audio power amplifier electromagnetic compatibility test equipment further comprises a power supply button arranged outside the second cavity.

[0028] The power supply button is connected between the power supply and the power supply chip.

[0029] The audio power amplifier electromagnetic compatibility test equipment further comprises a power supply button arranged outside the second cavity.

[0030] The utility model further provides a kind of vehicle, it is characterized in that, including: the vehicle-mounted audio power amplifier based on above-mentioned audio power amplifier electromagnetic compatibility test equipment carries out electromagnetic compatibility test and obtains.

[0031] The audio power amplifier electromagnetic compatibility test equipment and the vehicle provided by the utility model, through the connection of the digital signal processing chip and the automobile audio bus chip, the digital signal processing chip can send the sound source signal generated by itself to the automobile audio bus chip, the automobile audio bus chip converts the sound source signal into A2B signal and transmits to the audio power amplifier to be tested through the automobile audio bus interface. The introduction of the digital signal processing chip can generate sound source signal by itself, without external sound source input, thereby simplifying the design of the audio power amplifier electromagnetic compatibility test equipment, avoiding the influence of signal crosstalk and other EMC problems caused by interface exposure on the EMC test result of the audio power amplifier to be tested. Not only the stability and reliability of the equipment are improved, but also the risk of electromagnetic interference is reduced, and the high standard of EMC is ensured. In addition, the equipment required for testing can be reduced, the test complexity is reduced, and the test cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical scheme in the utility model or the related art, the following will briefly introduce the drawings needed to be used in the embodiment or the related art description, and obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0033] Figure 1 It is the structural schematic diagram of the traditional vehicle-mounted power amplifier EMC test equipment.

[0034] Figure 2 It is one of the structural schematic diagrams of the audio power amplifier electromagnetic compatibility test equipment provided by the utility model.

[0035] Figure 3 It is the second structural schematic diagram of the audio power amplifier electromagnetic compatibility test equipment provided by the utility model.

[0036] Figure 4 It is the third structural schematic diagram of the audio power amplifier electromagnetic compatibility test equipment provided by the utility model.

[0037] Figure 5 It is the fourth structural schematic diagram of the audio power amplifier electromagnetic compatibility test equipment provided by the utility model. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the utility model clearer, the technical scheme in the utility model will be described clearly and completely in combination with the drawings in the utility model below. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without making creative labor belong to the protection scope of the utility model.

[0039] Because in the traditional EMC test scheme of vehicle-mounted power amplifier, the required equipment for testing is more, the test complexity is higher, and the test cost is also higher. Moreover, the audio source signal needs to be generated through PC, and EMC problems such as signal crosstalk caused by interface exposure may occur. Therefore, the utility model embodiment provides an audio power amplifier electromagnetic compatibility test device.

[0040] Figure 2 The structure diagram of the audio power amplifier electromagnetic compatibility test device provided in the utility model embodiment is shown as Figure 2 The audio power amplifier electromagnetic compatibility test device comprises a digital signal processing (Digital Signal Processing, DSP) chip 11, an automobile audio bus (A2B) chip 12 and an A2B interface 13.

[0041] The DSP chip 11 is connected with the A2B chip 12.

[0042] The DSP chip 11 is used for generating an audio source signal.

[0043] The A2B chip 12 is used for being connected with a to-be-tested audio power amplifier through the A2B interface 13.

[0044] Specifically, the model of the DSP chip 11 can be ADAU1450, and the model of the A2B chip 12 can be AD2428. The DSP chip 11 can be internally provided with program code for generating an audio source signal, and the audio source signal is generated by running the program code, so as to perform EMC test on the to-be-tested audio power amplifier.

[0045] The audio signal generated by the DSP chip 11 can be sent to the A2B chip 12, and after receiving the audio source signal, the A2B chip 12 can convert the audio source signal into an A2B signal output and transmit the A2B signal to the to-be-tested audio power amplifier through the A2B interface 13.

[0046] The A2B interface 13 can comprise an A2B_A port 131 and an A2B_B port 132, the A2B_A port 131 is a sending end, and the A2B_B port 132 is a receiving end.

[0047] In addition, the audio power amplifier to be tested can also send an A2B signal to the A2B chip 12 through the A2B interface 13.

[0048] The audio power amplifier electromagnetic compatibility test device provided in the embodiment of the utility model, include: digital signal processing chip, car audio bus chip and car audio bus interface. Through digital signal processing chip and car audio bus chip connection, digital signal processing chip can send the audio source signal generated by itself to car audio bus chip, car audio bus chip converts the audio source signal into A2B signal and transmits to the audio power amplifier to be tested through car audio bus interface. The introduction of digital signal processing chip can generate audio source signal by itself without external audio source input, thereby simplifying the design of the audio power amplifier electromagnetic compatibility test device, avoiding the influence of signal crosstalk and other EMC problems caused by interface exposure on the EMC test results of the audio power amplifier to be tested. Not only improve the stability and reliability of the equipment, but also reduce the risk of electromagnetic interference, ensure the high standard of EMC. In addition, it can also reduce the equipment required for testing, reduce the complexity of testing and reduce the cost of testing.

[0049] When performing EMC test, if the audio power amplifier to be tested fails to meet the electromagnetic compatibility requirements, the capacitance debugging of the A2B interface 13 is a key step. When the audio power amplifier to be tested fails to meet the EMC requirements, electromagnetic interference may come from multiple sources, and it is difficult to quickly and accurately locate the problem by checking one by one. Based on this, on the basis of the above embodiment, as shown in Figure 3 The audio power amplifier electromagnetic compatibility test device further comprises a switch 14 and a plurality of capacitors 15 with different capacitance values.

[0050] The A2B chip 12 is connected to one end of the plurality of capacitors 15 through the switch 14, and the other end of the plurality of capacitors 15 is grounded.

[0051] The switch 14 is used to switch any one of the plurality of capacitors 15 to be connected between the A2B chip 12 and the ground.

[0052] Specifically, the number of capacitors 15 can be set as needed, which is not limited here. Figure 3 Only the case where the audio power amplifier electromagnetic compatibility test device includes four capacitors 15 is shown. One end of each capacitor 15 is connected to the A2B chip 12 through the switch 14, and the other end is grounded. Through the switch 14, any capacitor can be connected between the A2B chip 12 and the ground, the EMC performance under different capacitor configurations can be quickly verified, and the audio source that may produce noise interference can be checked one by one to achieve accurate positioning and analysis, not only improve the flexibility and response speed of the test, but also enhance the control and prediction ability of the test results.

[0053] It is understandable that each capacitor 15 can be a surface-mount capacitor, which can be flexibly set in advance according to the actual test requirements. This can avoid the adverse effects on the test results caused by poor soldering due to time constraints on the experimental site, thus improving the flexibility and response speed of the test and simplifying the operation process.

[0054] The capacitance value of each capacitor 15 can be set as needed; for example, there can be a capacitor with a capacitance value of 27pF.

[0055] Based on the above embodiments, the switching switch is a DIP switch;

[0056] The DIP switch includes multiple switching units;

[0057] The plurality of switching units are connected to the plurality of capacitors in a one-to-one correspondence.

[0058] Specifically, the switching switch used in this embodiment of the present invention can be a DIP switch, which can include multiple switching units, each of which is connected to a capacitor 15. Thus, by controlling each switching unit, the A2B chip 12 can be grounded through a certain capacitor to perform capacitor debugging of the A2B interface 13.

[0059] In this embodiment of the invention, a DIP switch is used as a switching switch, which can ensure the accuracy and efficiency of EMC testing and enable rapid switching between different capacitors.

[0060] Since a CAN wake-up message needs to be provided to the audio power amplifier under test, based on the above embodiments, as follows: Figure 4 As shown, the audio power amplifier electromagnetic compatibility testing equipment also includes a controller area network (CAN) wake-up circuit, which comprises a microcontroller unit (MCU) chip 16 and a controller area network (CAN) bus chip 17. The MCU chip 16 is connected to the DSP chip 11 and the CAN bus chip 17 respectively; the MCU chip 16 has a built-in CAN wake-up message.

[0061] The CAN bus chip 17 is used to connect to the audio power amplifier under test.

[0062] Specifically, the MCU chip 16 can be the S32K144 model, the CAN wake-up message can be programmed into the MCU chip 16, and the CAN bus chip 17 can be the TJA1463 model.

[0063] The MCU chip 16 can be connected with the DSP chip 11 through a serial peripheral interface (SPI) and can be connected with the CAN bus chip 17 through a CAN bus.

[0064] The DSP chip 11 can control the MCU chip 16 to provide a receive (RX) signal to the audio power amplifier to be tested through the CAN bus chip 17, in the process of which the CAN bus chip 17 can be woken up.

[0065] The audio power amplifier to be tested can also transmit a transmit (TX) signal to the MCU chip 16 through the CAN bus chip 17, in the process of which the CAN bus chip 17 can also be woken up.

[0066] It can be understood that the audio power amplifier electromagnetic compatibility test device further includes a CAN bus interface 18, which can include a receiving interface 181 and a transmitting interface 182, the receiving interface 181 being configured to receive the TX signal of the audio power amplifier to be tested, and the transmitting interface 182 being configured to transmit the RX signal of the CAN bus chip 17.

[0067] In the embodiment of the utility model, through the simplified CAN wake-up circuit, the integrated design reduces the dependence on external equipment, reduces the cost and complexity of the equipment, through the integrated design and the optimized circuit configuration, the stability and reliability of the equipment are improved, and the anti-interference ability of the equipment is improved. The device after the CAN wake-up simplification can reduce the test preparation time introduced by the wiring and debugging of the optical transceiver, and further improve the EMC test efficiency.

[0068] On the basis of the above embodiment, as shown in Figure 5 The DSP chip 11, the A2B chip 12, the MCU chip 16 and the CAN bus chip 17 are integrated on a printed circuit board (PCB) 19, so that the integration of the audio power amplifier electromagnetic compatibility test device can be greatly improved, and the size and complexity of the audio power amplifier electromagnetic compatibility test device can be reduced.

[0069] On the basis of the above embodiment, as shown in Figure 5 The audio power amplifier electromagnetic compatibility test device further includes a power supply chip (POWER) 21, which is connected with a power supply 22.

[0070] The power supply chip 21 is configured to convert the power supply voltage of the power supply 22 into a target voltage and output the target voltage.

[0071] Specifically, the power supply 22 can be composed of 4 batteries, and can provide 12V DC voltage. The target voltages can include 8.5V, 5V, 3.3V, etc., which are not specifically limited here.

[0072] The power supply chip 21 can include a direct current-direct current (DC-DC) converter and a low dropout linear regulator (LDO) to realize voltage conversion.

[0073] When the power supply is turned on, the power supply chip 21 can provide different target voltages for the PCB 19, which can meet the power supply requirements of different integrated circuits.

[0074] On the basis of the above embodiment, the audio power amplifier electromagnetic compatibility test equipment further comprises a box body, wherein the box body comprises a first cavity 19 and a second cavity 20;

[0075] The DSP chip 11 and the A2B chip 12 are integrated on the PCB 19, and the PCB 19 is arranged in the first cavity 19.

[0076] The power supply 22 is arranged in the second cavity 20.

[0077] In the embodiment of the utility model, since the PCB 19 and the power supply 22 are arranged in different cavities, the internal wiring of the audio power amplifier electromagnetic compatibility test equipment can be simplified.

[0078] On the basis of the above embodiment, as shown in Figure 5 The second cavity 20 is externally provided with a power button 23.

[0079] The power button 23 is connected between the power supply 22 and the power supply chip 21.

[0080] After the CAN bus chip 17 receives the RX signal and the TX signal, the CAN signal is converted and outputted internally, and when used, the power supply can be turned on directly through the power button 23.

[0081] Through the power button, the user can quickly turn on or off the audio power amplifier electromagnetic compatibility test equipment.

[0082] On the basis of the above embodiment, the audio source signal is a time division multiplexing (TDM) audio signal.

[0083] In summary, the utility model discloses an audio power amplifier EMC test equipment of integrated A2B chip and CAN bus chip is provided in the embodiment of the utility model, can simplify test procedure, improve test efficiency, ensure the reliability and performance of audio power amplifier in complex electromagnetic environment. Through this kind of innovative test equipment, the EMC performance of the audio power amplifier to be tested can be better evaluated and verified, so as to improve the safety and comfort of the main body applying the audio power amplifier. The device can provide pure audio source signal and CAN wake-up function for the audio power amplifier, and different capacitance capacitors can be flexibly pasted in advance according to actual test requirements, and the structure is simple.

[0084] On the basis of the above-mentioned embodiments, the utility model embodiment still provides a vehicle, include: through the audio power amplifier electromagnetic compatibility test equipment provided in each embodiment above carries out electromagnetic compatibility test and obtains the vehicle-mounted audio power amplifier. That is to say, the vehicle-mounted audio power amplifier is carried out electromagnetic compatibility test as the audio power amplifier to be tested in each embodiment above, so the vehicle can have the function of reducing electromagnetic interference.

[0085] The device embodiments described above are only schematic, wherein the units illustrated as separate components can or can not be physically separate, and the components illustrated as units can or can not be physical units, i.e., can be located in one place, or can be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the embodiment scheme. Those skilled in the art can understand and implement without creative labor.

[0086] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be realized by means of software and necessary general hardware platform, and of course can also be realized by hardware. Based on such understanding, the above technical solutions can be embodied in the form of software product, which can be stored in a computer readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., including a plurality of instructions to make a computer device (which can be a personal computer, server, or network device, etc.) execute the method described in each embodiment or some part of the embodiment.

[0087] It should be finally pointed out that: the above examples are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been explained in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. An electromagnetic compatibility testing device for an audio power amplifier, characterized in that, include: Digital signal processing chips, automotive audio bus chips, and automotive audio bus interfaces; The digital signal processing chip is connected to the automotive audio bus chip; The digital signal processing chip is used to generate sound source signals; The automotive audio bus chip is used to connect to the audio power amplifier under test via the automotive audio bus interface.

2. The audio power amplifier electromagnetic compatibility testing equipment according to claim 1, characterized in that, Also includes: Switch and multiple capacitors of different capacitance values; The automotive audio bus chip is connected to one end of each of the plurality of capacitors via the switching switch, and the other end of each of the plurality of capacitors is grounded. The switching switch is used to switch any one of the multiple capacitors connected between the automotive audio bus chip and ground.

3. The audio power amplifier electromagnetic compatibility testing equipment according to claim 2, characterized in that, The switch is a DIP switch; The DIP switch includes multiple switching units; The plurality of switching units are connected to the plurality of capacitors in a one-to-one correspondence.

4. The audio power amplifier electromagnetic compatibility testing equipment according to claim 1, characterized in that, It also includes: a controller area network wake-up circuit, which includes a microcontroller chip and a controller area network bus chip; The microcontroller chip is connected to the digital signal processing chip and the controller local area network (Controller Area Network) bus chip respectively; the microcontroller chip has a built-in Controller Area Network wake-up message; The controller area network bus chip is used to connect to the audio power amplifier under test.

5. The audio power amplifier electromagnetic compatibility testing equipment according to claim 4, characterized in that, The digital signal processing chip, the automotive audio bus chip, the microcontroller chip, and the controller local area network bus chip are all integrated on a printed circuit board.

6. The audio power amplifier electromagnetic compatibility testing equipment according to claim 1, characterized in that, It also includes a power supply chip; the power supply chip is connected to the power supply. The power supply chip is used to convert the supply voltage of the power supply into the target voltage and output it.

7. The audio power amplifier electromagnetic compatibility testing equipment according to claim 6, characterized in that, It also includes a housing, which contains a first cavity and a second cavity; Both the digital signal processing chip and the automotive audio bus chip are integrated on a printed circuit board, and the printed circuit board is disposed in the first cavity. The power supply is located inside the second cavity.

8. The audio power amplifier electromagnetic compatibility testing equipment according to claim 7, characterized in that, A power button is located outside the second cavity; The power button is connected between the power supply and the power supply chip.

9. The audio power amplifier electromagnetic compatibility testing equipment according to any one of claims 1-8, characterized in that, The audio source signal is a time-division multiplexed audio signal.

10. A vehicle, characterized in that, include: The vehicle-mounted audio power amplifier obtained by performing electromagnetic compatibility testing using the audio power amplifier electromagnetic compatibility testing equipment according to any one of claims 1-9.

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