Vehicle-mounted power amplifier module and vehicle-mounted audio equipment

Abstract

The utility model discloses a vehicle-mounted power amplifier module and vehicle-mounted audio equipment. Vehicle-mounted power amplifier module, include: first A2B chip, it is used to connect host computer to receive audio data and control signal from host computer, first A2B chip has data output port and PWM output port, power amplifier, and data output port electric connection of input, BOOST boost circuit, its output and power amplifier are connected to power supply for power amplifier, BOOST boost circuit has the PWM controller for controlling switch on-off to adjust output voltage, wherein, PWM controller and PWM output port electric connection. Vehicle-mounted power amplifier module and vehicle-mounted audio equipment can adjust the power of BOOST boost circuit according to the sound to be played, reduce the energy consumption of vehicle-mounted power amplifier.

Description

Technical Field

[0001] This utility model relates to a vehicle-mounted power amplifier module and a vehicle-mounted audio device. Background Technology

[0002] Energy issues are becoming increasingly serious with economic development, especially evident in the growing popularity of electric vehicles. The battery packs in electric vehicles have limited capacity, and to achieve longer driving ranges, each onboard ECU needs to further consider power saving. The same applies to power amplifiers. The continuous pursuit of superior sound quality and dynamic output has led to a constant increase in the supply voltage of power amplifier chips. While this satisfies sound quality requirements, it also brings serious power consumption problems.

[0003] The information disclosed in the background section is only intended to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0004] The purpose of this invention is to provide a vehicle power amplifier module and vehicle audio equipment that can adjust the voltage supplied to the power amplifier by adjusting the power of the BOOST boost circuit, thereby reducing the energy consumption of the vehicle power amplifier.

[0005] The first aspect of this utility model provides a vehicle-mounted power amplifier module, comprising:

[0006] The first A2B chip is used to connect to the host to receive audio data and control signals from the host. The first A2B chip has a data output port and a PWM output port.

[0007] The power amplifier has its input terminal electrically connected to the data output port;

[0008] A BOOST boost circuit, the output of which is connected to the power amplifier to supply power to the power amplifier, the BOOST boost circuit having a PWM controller for controlling the switching on and off to adjust the output voltage;

[0009] The PWM controller and the PWM output port are electrically connected.

[0010] In a preferred embodiment, the first A2B chip includes a register configured according to the control signal, and the PWM output port outputs a PWM signal according to the configuration of the register.

[0011] In a preferred embodiment, the switch includes a MOSFET or a transistor, and the PWM controller includes the gate of the MOSFET or the base of the transistor.

[0012] In a preferred embodiment, the BOOST boost circuit is connected to a power supply, and the power amplifier has an output terminal electrically connected to a vehicle speaker.

[0013] In a preferred embodiment, the data output port of the first A2B chip and the power amplifier are electrically connected via a TDM signal line.

[0014] A second aspect of this utility model provides an in-vehicle audio device, which includes a host unit and the in-vehicle power amplifier module, wherein the host unit is connected to the first A2B chip.

[0015] In a preferred embodiment, the host includes a second A2B chip, which is electrically connected to the first A2B chip via an A2B bus.

[0016] In a more preferred embodiment, the host further includes an audio processing chip, which is electrically connected to the second A2B chip via a TDM signal line to send audio data to the first A2B chip.

[0017] In a further preferred embodiment, the audio processing chip and the second A2B chip are also connected via I... 2 The C line is electrically connected to send control signals to the second A2B chip.

[0018] In a further preferred embodiment, the audio processing chip includes a DSP chip.

[0019] The present invention adopts the above solution and has the following advantages compared with the prior art:

[0020] The vehicle-mounted power amplifier module and vehicle-mounted audio equipment of this utility model utilize the PWM output port of the A2B chip itself, which can output PWM signals. This PWM output port is connected to the PWM controller of the BOOST boost circuit, thereby adjusting the output voltage of the BOOST boost circuit according to the audio data to be played. The BOOST boost circuit supplies power to the power amplifier, which can flexibly adjust the voltage of the power amplifier and reduce the power consumption of the power amplifier. Attached Figure Description

[0021] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a block diagram of an in-vehicle audio device according to an embodiment of the present utility model.

[0023] Figure 2 This is a circuit diagram of a BOOST boost circuit according to an embodiment of the present invention.

[0024] In the above attached figures,

[0025] 1. Main unit; 11. DSP chip; 12. Second A2B chip; 13. TDM signal line; 14. I 2 C line

[0026] 2. Vehicle power amplifier module; 21. First A2B chip; 211. Data output port; 212. PWM output port; 22. Power amplifier; 23. BOOST boost circuit; 231. Switch;

[0027] 3. A2B bus. Detailed Implementation

[0028] 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. It should be noted that the description of these embodiments is for the purpose of aiding understanding the present invention, but does not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] The embodiments relate to a vehicle-mounted amplifier module and a vehicle-mounted audio device, which are installed in a vehicle to enable sound playback inside or outside the vehicle.

[0030] Figure 1 A block diagram of an embodiment of an in-vehicle audio system device is shown. (Refer to...) Figure 1 As shown, the in-vehicle audio equipment mainly includes a host unit 1 and an in-vehicle amplifier module 2. The host unit 1 can be electrically connected to the vehicle's infotainment system, and the infotainment system can send audio data and detection information to the host unit 1. There can be one or more in-vehicle amplifier modules 2; if there are multiple modules, each in-vehicle amplifier module 2 is connected to the host unit 1. The in-vehicle amplifier module 2 includes a first A2B chip 21 and an amplifier 22. The amplifier 22 is electrically connected to the vehicle's speakers or pedestrian warning devices to drive them to perform electroacoustic conversion and play the required sound.

[0031] The host unit 1 includes an audio processing chip 11, which is used to parse and process audio source files. Furthermore, the audio processing chip 11 is electrically connected to the vehicle infotainment system to receive commands from the system, such as commands to turn the amplifier on, turn the amplifier off, and adjust the volume. The audio processing chip 11 can be a DSP chip, which is a microprocessor capable of high-speed digital signal processing, implementing audio digital signal processing through digital algorithms.

[0032] The host unit 1 also includes a second A2B chip 12. The first A2B chip 21 and the second A2B chip 12 are electrically connected via an A2B bus 3 for communication. The A2B bus (Automotive Audio Bus) is a high-bandwidth digital audio bus designed specifically for automotive audio systems. It transmits audio, control signals, clock, and power over a single unshielded twisted pair (UTP) cable. The A2B chip supports this proprietary A2B audio bus technology for signal transmission, reception, and processing. It can be programmed via the control bus for configuration and readback.

[0033] Audio processing chip 11 and second A2B chip 12 are electrically connected via TDM signal line 13 to send audio data to first A2B chip 21. TDM (Time Division Multiplexing) divides a channel according to time, and the sampled and quantized values ​​of each voice signal occupy a fixed time interval in a certain order. The TDM signals transmitted to second A2B chip 12 via TDM signal line 13 include data bit clock signal (BCLK), frame synchronization clock signal (SYNC), and audio data input / output signal (SD).

[0034] The audio processing chip 11 also connects to the second A2B chip 12 via I 2 Line C 14 is electrically connected to send control signals to the second A2B chip 12. 2 C stands for Integrated Circuit Bus, a serial communication interface that typically includes SDA (Serial Data Line) and SCL (Serial Clock Line). I 2 The control signal transmitted from line C14 to the second A2B chip 12 is I. 2 C-format signals.

[0035] The first A2B chip 21 of the vehicle-mounted power amplifier module 2 is used to connect to the host 1 to receive audio data and control signals from the host 1. Specifically, the first A2B chip 21 is electrically connected to the second A2B chip 12 of the host 1 via the A2B bus 3. The host 1 sends the audio data to be played and the corresponding control signals to the first A2B chip 21 via the A2B bus 3. The first A2B chip 21 has a data output port 211 and a PWM output port 212. The input terminal of the power amplifier 22 is electrically connected to the data output port 211 of the first A2B chip 21 to receive the transmitted audio data.

[0036] The vehicle-mounted power amplifier module 2 also includes a BOOST boost circuit 23. The output of the BOOST boost circuit 23 is connected to the power amplifier 22 to supply power to the power amplifier 22. The BOOST boost circuit 23 has a PWM controller 231 for controlling the switching on and off to regulate the output voltage. The PWM controller 231 is electrically connected to the PWM output port 212 of the first A2B chip 21. The data output port 211 of the first A2B chip 21 and the power amplifier 22 are electrically connected via TDM signal lines.

[0037] Specifically, Figure 2 An embodiment of a BOOST boost circuit 23 is shown. The BOOST boost circuit 23 includes a switch 231, an inductor, diodes, etc. The switch 231 is a switching transistor, including but not limited to a MOSFET or a transistor. The gate of the MOSFET or the base of the transistor can serve as the aforementioned PWM controller. The first A2B chip 21 can send a PWM signal to the switch 231 through the PWM controller to control the closing and opening of the switch 231. Furthermore, the duty cycle of the PWM signal can adjust the ratio of the closing time and the on-time of the switch 231, thereby adjusting the output voltage of the BOOST boost circuit 23. Specifically... Figure 2 In the embodiment shown, the BOOST boost circuit 23 is integrated into a chip. The PWM output port of the A2B chip 21 is connected to the TRACK port of the chip and finally transmitted to the gate of the switch 231. According to the PWM signal, the other two poles (source and drain) of the switch 321 are closed and turned on for the corresponding time according to the duty cycle, and the chip adjusts the magnitude of the output voltage accordingly. Figure 2 In the diagram, MUX is the gate and Gm1 is the comparator. The BOOST boost circuit 23 is connected to a power supply (which can be taken from the vehicle's infotainment system voltage). The output of the power amplifier 22 is electrically connected to the vehicle speaker, specifically to the speaker's leads, to supply current to the voice coil.

[0038] The first A2B chip 21 includes a register, which is configured according to control signals. The PWM output port 212 outputs a corresponding PWM signal according to the register configuration. The first A2B chip 21 is a known audio transmission chip that inherently possesses PWM functionality, based on the received I... 2 The C control signal is used to configure the register, and the chip outputs the corresponding PWM signal according to the register configuration. Generating PWM signals based on register configuration is a known technique in the art and will not be elaborated here.

[0039] In the embodiment of the vehicle-mounted power amplifier module 2 and the vehicle-mounted audio device, the vehicle-mounted power amplifier module 2 utilizes the PWM function in the first A2B chip 21 to synchronously send the PWM duty cycle information and audio data to the first A2B chip 21 through the algorithm of the DSP chip of the host 1, thereby adjusting the output voltage of the BOOST boost circuit 23. In some embodiments, the output voltage of the BOOST boost circuit 23 can also be adjusted in real time by directly adjusting the volume level on the host 1.

[0040] For the audio data that needs to be sent to the A2B chip of the vehicle amplifier module 2, i.e., the audio data that the vehicle speakers need to play, the DSP chip at the host 1 performs amplitude analysis on the playback data. Based on the analysis results of the audio amplitude, the DSP chip configures the duty cycle of the PWM wave of the vehicle amplifier module 2. This PWM wave is used to adjust the output voltage of the BOOST boost circuit 23, i.e., to adjust the voltage at the chip end of the amplifier 22, providing corresponding supply voltages for audio at different volume levels. Compared to the chip I / O control mode, the vehicle amplifier module 2 and the vehicle audio equipment in this embodiment reduce the power consumption of the vehicle amplifier 22.

[0041] As indicated in this specification and claims, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, and these steps and elements do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0042] It can be further understood that in this disclosure, "multiple" refers to two or more, and other quantifiers are similar.

[0043] It is further understood that the terms "first," "second," etc., are used to describe various types of information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another, and do not indicate a specific order or degree of importance. In fact, the expressions "first," "second," etc., are completely interchangeable. For example, without departing from the scope of this disclosure, first information can also be referred to as second information, and similarly, second information can also be referred to as first information.

[0044] The above embodiments are only for illustrating the technical concept and features of this utility model, and are preferred embodiments. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly, and they cannot be used to limit the protection scope of this utility model.

Claims

1. A vehicle-mounted power amplifier module, characterized in that, include: The first A2B chip is used to connect to the host to receive audio data and control signals from the host. The first A2B chip has a data output port and a PWM output port. The power amplifier has its input terminal electrically connected to the data output port; A BOOST boost circuit, the output of which is connected to the power amplifier to supply power to the power amplifier, the BOOST boost circuit having a PWM controller for controlling the switching on and off to adjust the output voltage; The PWM controller and the PWM output port are electrically connected.

2. The vehicle-mounted power amplifier module according to claim 1, characterized in that, The first A2B chip includes a register, which is configured according to the control signal, and the PWM output port outputs a PWM signal according to the configuration of the register.

3. The vehicle-mounted power amplifier module according to claim 1, characterized in that, The switch includes a MOSFET or a transistor, and the PWM controller includes the gate of the MOSFET or the base of the transistor.

4. The vehicle-mounted power amplifier module according to claim 1, characterized in that, The BOOST boost circuit is connected to a power supply, and the power amplifier has an output terminal that is electrically connected to the vehicle speaker.

5. The vehicle-mounted power amplifier module according to claim 1, characterized in that, The data output port of the first A2B chip and the power amplifier are electrically connected via TDM signal lines.

6. A vehicle-mounted audio device, comprising a main unit, characterized in that, The in-vehicle audio device further includes an in-vehicle power amplifier module as described in any one of claims 1 to 5, wherein the host and the first A2B chip are connected.

7. The in-vehicle audio device according to claim 6, characterized in that, The host includes a second A2B chip, which is electrically connected to the first A2B chip via an A2B bus.

8. The in-vehicle audio device according to claim 7, characterized in that, The host also includes an audio processing chip, which is electrically connected to the second A2B chip via a TDM signal line to send audio data to the first A2B chip.

9. The in-vehicle audio device according to claim 8, characterized in that, The audio processing chip also communicates with the second A2B chip via I... 2 The C line is electrically connected to send control signals to the second A2B chip.

10. The in-vehicle audio device according to claim 8, characterized in that, The audio processing chip includes a DSP chip.

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