Detection system for aging test function of automobile power amplifier
By designing a testing system that integrates an A2B controller, a USB communication module, and an oscilloscope, the problem that existing automotive amplifier testing equipment cannot support the A2B bus protocol is solved. This enables unattended monitoring and efficient testing of the digital amplifier under test, improving the rigor of testing and production efficiency.
Patent Information
- Application Number
- CN202422479497.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-14
- Publication Date
- 2025-11-04
- Estimated Expiration
- 2034-10-14
AI Technical Summary
Existing automotive amplifier testing equipment cannot effectively support the testing of digital audio signals using the A2B bus protocol, resulting in poor compatibility between the testing equipment and actual application scenarios, which affects testing efficiency and accuracy.
A testing system was designed, comprising a power supply module, an automotive power amplifier aging tester, a PC host computer, N-channel load resistors, and an oscilloscope. The system uses an A2B controller to input digital audio signals and output analog audio signals. It combines a USB communication module, an MCU module, a DSP module, and an ADC module for signal conversion and processing. Relays and optocoupler isolation chips are used for signal switching and isolation, thereby simulating the in-vehicle working state of the digital power amplifier under test.
This enables unattended monitoring of the digital power amplifier under test, improving the rigor and consistency of the test, enabling timely detection of anomalies and recording of faults, reducing the cost of manual intervention, and improving production efficiency and product competitiveness.
Smart Images
Figure CN223513281U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of instrument testing technology, specifically to a testing system for aging testing of automotive power amplifiers. Background Technology
[0002] Driven by the wave of intelligentization, more and more active control devices are being applied to automobiles to enhance the driving experience. Among these applications, independent external power amplifiers are gradually being deployed in mid-to-low-end vehicles, and the market for independent power amplifier products is growing year by year. For manufacturers, improving the efficiency of aging tests during product sampling and mass production is crucial for enhancing product competitiveness. Currently, mainstream power amplifiers use the A2B bus protocol. A2B (Automotive Audio Bus) technology is an audio bus architecture specifically designed for automotive audio applications, providing high-quality audio transmission and supporting high-bandwidth, low-latency audio and control data transmission. It is a communication protocol integrating audio and control signals. However, current mainstream power amplifier testing equipment uses analog input and output, making testing equipment using digital audio signals with A2B bus input a much-needed solution. Utility Model Content
[0003] To overcome the above-mentioned shortcomings, the purpose of this utility model is to provide a testing system for the aging test function of automotive power amplifiers, so as to solve the problems mentioned in the background art.
[0004] To achieve the above objectives, the present invention adopts a testing system for automotive power amplifier aging testing, used to test the digital power amplifier under test, which includes A2B slave nodes. The testing system includes a power module, an automotive power amplifier aging tester, a PC host computer, N-channel load resistors, and an oscilloscope, wherein:
[0005] The power module is used to supply power.
[0006] The PC host computer is connected to the automotive power amplifier aging tester via signal transmission.
[0007] The automotive power amplifier aging tester includes an A2B controller, which includes an A2B master node for connecting to the A2B slave node via an A2B bus to transmit audio data and control data to the digital power amplifier under test.
[0008] The N load resistors are respectively connected to the analog signal output terminal of the digital power amplifier under test and the oscilloscope to generate N audio signals and display the waveforms through the oscilloscope.
[0009] The output terminal of the oscilloscope is connected to the PC host computer and the car power amplifier aging tester respectively, and is used to output analog signals to the car power amplifier aging tester and transmit audio signal information to the PC host computer.
[0010] Preferably, the automotive power amplifier aging tester further includes a USB communication module, an MCU module, a DSP module, and an ADC module. The USB communication module is connected to the PC host computer for transmitting USB control signals. The MCU module is used to initialize the ADC module and the DSP module. The ADC module is used to convert the analog signals into digital signals. The DSP module is used to configure the host computer and audio format of the A2B controller.
[0011] Preferably, the detection system further includes a relay connected in series between the N load resistors and the oscilloscope, for converting the N audio signals into a single audio signal.
[0012] Preferably, the automotive power amplifier aging tester further includes an optocoupler isolation chip, the optocoupler output terminal of which is connected to the relay signal for controlling the relay's turn-off and turn-on.
[0013] Preferably, the automotive power amplifier aging tester further includes a connector for connecting to the power module, the PC host computer, the oscilloscope, and the relay circuit.
[0014] Preferably, the power module is a 220V to 12V multi-channel regulated power supply.
[0015] Preferably, the relay is an NPN type relay.
[0016] Compared with the prior art, the detection system for aging testing of automotive power amplifiers provided in this application has the following advantages:
[0017] The testing system includes a 220V to 12V multi-channel regulated power supply, an amplifier aging tester, N-channel load resistors, NPN relays, an oscilloscope, and a PC host computer. The automotive amplifier aging tester communicates with the PC host computer via a USB communication module, allowing for analog audio signal input, digital audio signal output, and optocoupler signal output. This enables the input of digital audio signals to the digital amplifier under test to simulate the audio signals of a car's head unit, while the output section connects to N-channel load resistors to simulate the speakers inside the car. This allows the device under test to simulate the normal working conditions inside a car, ensuring the rigor and consistency of the test.
[0018] This system enables unattended monitoring of digital power amplifiers under test. When an malfunction occurs, the system records the fault, reports it to staff, and continues monitoring until the test is complete. This system improves production efficiency and cycle time, thereby reducing costs and enhancing product competitiveness. Attached Figure Description
[0019] Figure 1 This is a structural principle block diagram of an embodiment of a testing system for aging testing of automotive power amplifiers according to the present invention.
[0020] Figure 2 This is a schematic diagram of the structure of an automotive power amplifier aging tester, which is an embodiment of a testing system for automotive power amplifier aging testing.
[0021] Figure 3 This is a schematic diagram of an extended structure of an embodiment of a testing system for aging testing of automotive power amplifiers according to the present invention. Detailed Implementation
[0022] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.
[0023] refer to Figure 1 and Figure 2 , Figure 1 This diagram illustrates the structural principle block diagram of a testing system for automotive power amplifier aging testing provided by an embodiment of the present invention. Figure 2 The diagram shows a schematic of the structure of an automotive power amplifier aging tester for automotive power amplifier aging test function provided by an embodiment of the present invention.
[0024] like Figure 1 and Figure 2 As shown, the technical solution provided in this application is a testing system for automotive power amplifier aging tests, used to test the digital power amplifier under test, which includes an A2B slave node. The testing system includes a power module, an automotive power amplifier aging tester, a PC host computer, N load resistors, and an oscilloscope, wherein: the power module is used for power supply; the PC host computer is signal-connected to the automotive power amplifier aging tester; the automotive power amplifier aging tester includes an A2B controller, which includes an A2B master node for connecting to the A2B slave nodes via an A2B bus to transmit audio data and control data to the digital power amplifier under test.
[0025] N load resistors are connected to the analog signal output of the digital power amplifier under test and an oscilloscope, respectively, to generate N audio signals and display their waveforms on the oscilloscope. The output of the oscilloscope is connected to a PC and an automotive power amplifier aging tester, respectively, to output analog signals to the automotive power amplifier aging tester and transmit audio signal information to the PC.
[0026] This application provides a testing system for automotive power amplifier aging tests. The system primarily enables communication between the automotive power amplifier aging tester and a PC, allowing for analog audio signal input and digital audio signal output. The test system can input digital audio signals to the digital power amplifier under test to simulate the audio signals of a car's head unit. The output section of the digital power amplifier under test is connected to N load resistors to simulate the speakers in the car, thus allowing the digital power amplifier under test to simulate normal operating conditions in the car, ensuring the rigor and consistency of the test. The output of an oscilloscope is connected to the PC, enabling real-time monitoring of the power amplifier's output signals and status parameters, timely detection of anomalies, and transmission of audio signal information to the PC for data analysis and recording. Furthermore, the automotive power amplifier aging tester is compatible with various A2B transceiver series, such as AD241x, AD242X, and AD243x, allowing the tester to adapt to various testing needs and equipment.
[0027] In some embodiments, reference Figure 1 and Figure 2 The automotive amplifier aging tester also includes a USB communication module, an MCU module, a DSP module, and an ADC module. The USB communication module connects to a PC for transmitting USB control signals. The MCU module initializes the ADC and DSP modules. The ADC module converts analog signals to digital signals. The DSP module configures the host computer and audio format for the A2B controller.
[0028] For example, connecting to the PC via a USB communication module simplifies data transmission and improves transmission speed and convenience. The MCU module (Microcontroller Unit) initializes the ADC and DSP modules, allowing for better control of hardware operations, improving system stability and response speed. It also controls the optocoupler output of GPIO and enables communication with the PC via the USB communication module. RS232, RS485, CAN, and UART functions are also reserved. The ADC module (Analog-to-Digital Converter) converts analog signals to digital signals. A high-precision ADC module provides more accurate data, thus improving the overall system performance. The DSP module (Digital Signal Processor) configures the A2B controller's host computer and audio format. As the central controller for audio data processing, a high-performance DSP module can handle complex audio signals, providing better sound quality and more efficient data processing.
[0029] In some embodiments, reference Figure 1 and Figure 2 The detection system also includes a relay, which is connected in series between N load resistors and the oscilloscope to convert N audio signals into 1 audio signal.
[0030] For example, a relay provides a physical switch that can reliably switch between different audio signals in a multi-channel signal configuration and effectively isolate different signal paths, reduce crosstalk and interference, improve signal quality and system stability, thereby enabling the stable conversion of N audio signals into 1 audio signal.
[0031] In some embodiments, reference Figure 1 and Figure 2 The automotive power amplifier aging tester also includes an optocoupler isolation chip. The optocoupler output terminal of the optocoupler isolation chip is connected to the relay signal to control the relay's turn-off and turn-on.
[0032] For example, the optocoupler isolation chip provides electrical isolation between circuits, protects the circuits from high voltage surges, and can precisely control the switching on and off of relays, ensuring the accuracy and stability of signal switching. By controlling the switching on and off of relays through the high and low levels of the output, the polling test of N-channel audio signals can be realized.
[0033] In some embodiments, reference Figure 1 and Figure 2 The automotive amplifier aging tester also includes connectors for connecting to the power module, PC host computer, oscilloscope, and relay circuitry.
[0034] For example, the use of connectors makes the entire testing system more modular, facilitating assembly and maintenance, as well as system expansion and upgrades.
[0035] In some embodiments, the power module is a 220V to 12V multi-channel regulated power supply.
[0036] For example, a multi-channel regulated power supply can provide a stable 12V DC power supply and has protection functions such as overvoltage, overcurrent, short circuit, and overheating to ensure the stability of the power supply during the test.
[0037] In some embodiments, reference Figure 1 and Figure 2 The relay is an NPN type relay.
[0038] For example, using NPN transistors can simplify circuit design because they will turn on when the base current is large enough, without needing to consider a high input voltage. This makes the circuit design simpler and more straightforward. At the same time, when NPN transistors drive relays, only a small voltage is needed to saturate and turn on the transistors, making them suitable for low-voltage driving applications in this solution.
[0039] The test procedure for a testing system for automotive power amplifier aging testing provided in this application is described below:
[0040] After the testing system is powered on, the A2B controller in the car power amplifier aging tester is controlled by the PC host computer to communicate with the digital power amplifier under test, thereby realizing the connection of the A2B link.
[0041] The oscilloscope outputs an analog signal to the test instrument, typically a standard 1kHz sine wave.
[0042] The automatic test program in the PC host computer is running. At this time, the car power amplifier aging tester can realize multi-channel polling test by controlling the relay, and the oscilloscope tests the output waveform of the digital power amplifier under test.
[0043] The oscilloscope feeds back the displayed data to the PC, and displays the pattern on the oscilloscope on the PC, allowing for a direct observation of the load output waveform.
[0044] The PC's algorithm compares the waveform data fed back from the oscilloscope with the ideal waveform data to determine whether the channel is working properly.
[0045] PC-based testing is divided into automatic testing and manual testing. Manual testing allows for testing and observation of a specific channel, mainly used by staff to troubleshoot problems. Automatic testing involves the device performing automatic wireless polling detection.
[0046] When a fault occurs, record it, report the channel number, and proceed with the next test. If the channel still has a problem in the second round of testing, record it again until the test ends. If the channel recovers, stop recording.
[0047] After the test is completed, all anomalies that occurred during the entire test process are printed out for staff to analyze.
[0048] refer to Figure 3 , Figure 3 This invention provides a schematic diagram of an extended structure for aging test function of automotive power amplifiers.
[0049] like Figure 3 As shown, this system was designed to improve efficiency, reduce costs, and free people from mechanical tasks. Therefore, it is scalable, supporting up to 10 devices under test (DUTs) for simultaneous aging tests. Simply increasing the load and relay count allows for polling all output signals of the 10 DUTs. Using this expansion system can significantly improve testing efficiency without incurring substantial additional costs. In the product sampling stage, to avoid randomness during testing, three products need to be tested simultaneously; this system solves the problem of requiring three tests. In the mass production stage, where full-inspection aging tests are required, this system can simultaneously test 10 DUTs.
Claims
1. A testing system for aging testing of automotive power amplifiers, used to test a digital power amplifier under test, the digital power amplifier under test including an A2B slave node, characterized in that, The testing system includes a power module, an automotive amplifier aging tester, a PC host computer, N-channel load resistors, and an oscilloscope, wherein: The power module is used to supply power; The PC host computer is connected to the car power amplifier aging tester via signal connection. The automotive power amplifier aging tester includes an A2B controller, which includes an A2B master node for connecting with the A2B slave node via an A2B bus to transmit audio data and control data to the digital power amplifier under test. The N load resistors are respectively connected to the analog signal output terminal of the digital power amplifier under test and the oscilloscope, and are used to generate N audio signals and display the waveforms through the oscilloscope; The output terminal of the oscilloscope is connected to the PC host computer and the car power amplifier aging tester respectively, and is used to output analog signals to the car power amplifier aging tester and transmit audio signal information to the PC host computer.
2. The detection system according to claim 1, characterized in that, The automotive power amplifier aging tester also includes a USB communication module, an MCU module, a DSP module, and an ADC module; the USB communication module is connected to the PC host computer for transmitting USB control signals; the MCU module is used to initialize the ADC module and the DSP module; the ADC module is used to convert the analog signal into a digital signal; and the DSP module is used to configure the host and audio format of the A2B controller.
3. The detection system according to claim 1, characterized in that, It also includes a relay, which is connected in series between the N load resistors and the oscilloscope, and is used to convert the N audio signals into a single audio signal.
4. The detection system according to claim 3, characterized in that, The automotive power amplifier aging tester also includes an optocoupler isolation chip. The optocoupler output terminal of the optocoupler isolation chip is connected to the relay signal and is used to control the relay's turn-off and turn-on.
5. The detection system according to claim 3, characterized in that, The automotive power amplifier aging tester also includes a connector for connecting to the power module, the PC host computer, the oscilloscope, and the relay circuit.
6. The detection system according to claim 1, characterized in that, The power module is a 220V to 12V multi-channel regulated power supply.
7. The detection system according to claim 3, characterized in that, The relay is an NPN type relay.