Control method, system and vehicle

Abstract

Provided in the present application are a control method, a system and a vehicle. The method can be applied to the field of intelligent vehicles, and can be applied to a controller. The method comprises: acquiring a first modulated signal and N first voltage values, the first modulated signal being a modulated signal obtained by modulating an audio signal, the N first voltage values being associated with the first modulated signal, and the N first voltage values being voltage values when N power supply circuits supply power to M amplification circuits; on the basis of the first modulated signal and the N first voltage values, determining N second modulated signals and, on the basis of the N second modulated signals, outputting M first audio modulated signals to the M amplification circuits, the degree of fluctuation of the duty cycles of the M first audio modulated signals being lower than that of the first modulated signal. In large-power scenarios, the method enables onboard power amplifier products to achieve higher power amplification efficiency and reduce overall signal distortion.

Description

Control methods, systems and vehicles

[0001] This application claims priority to Chinese patent application filed on May 31, 2024, with application number 202410705409.7 and title “Control Method, System and Vehicle”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of intelligent vehicles, and more specifically, to a control method, system, and vehicle. Background Technology

[0003] As smart cars become more widely used in daily life, users expect them and related devices to provide a more comfortable and intelligent experience. Against this backdrop, in-vehicle amplifiers are gaining increasing popularity among users.

[0004] Currently, most automotive amplifier products use Class D amplifier technology (also known as digital amplifier technology). Because Class D amplifier technology modulates the signal according to its duty cycle, the strength of the output signal is proportional to the width of the signal pulse. Therefore, the accuracy of the output signal is affected by the precision of the duty cycle control. Especially in high-power scenarios (e.g., over 300W per channel), the application of Class D amplifier technology may lead to severe amplifier overheating, increased audio signal distortion, and reduced amplifier efficiency, thus affecting the user's audio experience. Summary of the Invention

[0005] This application provides a control method, system, and vehicle that enables in-vehicle power amplifier products to achieve higher power amplifier efficiency and reduce overall signal distortion in high-power scenarios.

[0006] In a first aspect, a control method is provided, which is applied in a controller. The controller is connected to M speakers via N power supply circuits and M amplifier circuits. The N power supply circuits supply power to the M amplifier circuits, and the M amplifier circuits amplify the voltage of a modulation signal output by the controller. M and N are positive integers, and N is less than or equal to M. The method includes: acquiring a first modulation signal and N first voltage values, wherein the first modulation signal is a modulation signal obtained by modulating an audio signal, the N first voltage values ​​are associated with the first modulation signal, and the N first voltage values ​​are voltage values ​​when the N power supply circuits supply power to the M amplifier circuits; determining N second modulation signals based on the first modulation signal and the N first voltage values; and outputting M first audio modulation signals to the M amplifier circuits based on the N second modulation signals, wherein the duty cycle oscillation of the M first audio modulation signals is lower than that of the first modulation signal.

[0007] In one possible implementation, the connection between the controller and the M speakers can be an electrical connection or a connection in other ways (e.g., wired or wireless connection), and this application does not limit the connection method.

[0008] In one possible implementation, the association of N first voltage values ​​with the first modulation signal can be understood as follows: the N first voltage values ​​are the voltage values ​​when N power supply circuits supply power to M amplifier circuits according to the first modulation signal.

[0009] In one possible implementation, the fact that the duty cycle oscillation of the M first audio modulation signals is lower than that of the first modulation signal can be understood as: the M first audio modulation signals can reach a stable state faster than the first modulation signal, that is, the stability of the M first audio modulation signals is better.

[0010] In one possible implementation, N power supply circuits can feed back N first voltage values ​​to the controller through N power supply voltage feedback circuits. Correspondingly, the controller can obtain N first voltage values ​​through the N power supply voltage feedback circuits.

[0011] In this embodiment, the controller can obtain N second modulation signals based on the first modulation signal and N first voltage values ​​fed back from the N power supply circuits, and output M first audio modulation signals to the M amplifier circuits based on the N second modulation signals, so as to ensure that the M amplifier circuits stably drive the speaker based on the M first audio modulation signals. In this way, because the first audio modulation signal has better stability, the vehicle power amplifier product can achieve higher power amplifier efficiency in high-power scenarios and reduce overall signal distortion.

[0012] In conjunction with the first aspect, in some implementations of the first aspect, the method further includes: acquiring N first current values, the N first current values ​​being associated with the first modulation signal, and the N first current values ​​being current values ​​when the N power supply circuits supply power to the M amplifier circuits; the step of determining N second modulation signals based on the first modulation signal and the N first voltage values ​​includes: determining the N second modulation signals based on the first modulation signal, the N first voltage values, and the N first current values.

[0013] In one possible implementation, the controller can obtain the aforementioned N first current values ​​through N power supply current feedback circuits.

[0014] In this embodiment of the application, when determining the N second modulation signals, the N first current values ​​fed back by the N power supply circuits are also considered. In this way, the stability of the M first audio modulation signals obtained based on the N second modulation signals is better, the power amplifier efficiency when the M speakers are working is also higher, and the overall signal distortion of the vehicle power amplifier product can be further reduced.

[0015] In conjunction with the first aspect, in some implementations of the first aspect, the method further includes: acquiring M second current values, wherein the M second current values ​​are current values ​​of the M speakers operating based on M second audio modulation signals, and the M second audio modulation signals are modulation signals obtained by voltage amplification of the M first audio modulation signals through the M amplifier circuits; and outputting M third audio modulation signals to the M amplifier circuits according to the M first audio modulation signals and the M second current values, wherein the oscillation degree of the duty cycle of the M third audio modulation signals is lower than that of the M first audio modulation signals.

[0016] In one possible implementation, the controller can obtain M second current values ​​through M current feedback circuits corresponding to M speakers.

[0017] In this embodiment, the controller can output M third audio modulation signals to M amplifier circuits based on M second current values ​​fed back from M speakers. This allows the M amplifier circuits to drive the speakers based on the M third audio modulation signals. In this way, since the controller can anticipate the impedance changes of the M speakers based on the M second current values, the use of the third audio modulation signals can better address these impedance changes, reducing the side effects of the speakers' inductance characteristics and further reducing the distortion rate of the vehicle amplifier system.

[0018] In conjunction with the first aspect, in some implementations of the first aspect, the M amplification circuits are connected to the M loudspeakers through M filter circuits, and the M filter circuits include M first acquisition units, which are used to acquire the M second current values.

[0019] In one possible implementation, the aforementioned M first acquisition units can be M acquisition chips. These M first acquisition units can be deployed in M ​​filter circuits, between the M filter circuits and the M speakers, or after the M speakers.

[0020] In conjunction with the first aspect, in some implementations of the first aspect, the method further includes: acquiring M second voltage values, the M second voltage values ​​being voltage values ​​of the M speakers operating based on the M second audio modulation signals; the step of outputting the M third audio modulation signals to the M amplifier circuits based on the M first audio modulation signals and the M second current values ​​includes: outputting the M third audio modulation signals to the M amplifier circuits based on the M first audio modulation signals, the M second current values, and the M second voltage values.

[0021] In one possible implementation, the controller can obtain the aforementioned M second voltage values ​​through M voltage feedback circuits corresponding to M speakers.

[0022] In this embodiment, when outputting M third audio modulation signals to M amplifier circuits, the M second voltage values ​​fed back by the speakers are also taken into account. In this way, the controller can more accurately know the impedance characteristic changes of the M speakers based on the M second current values ​​and M second voltage values, thereby enabling the output of more stable third audio modulation signals.

[0023] In conjunction with the first aspect, in some implementations of the first aspect, the controller is further connected to the M speakers via the M voltage feedback circuits, the M voltage feedback circuits including M second acquisition units for acquiring the M second voltage values.

[0024] In one possible implementation, the M second acquisition units can be M high-precision analog-to-digital converters (ADCs), such as 16-bit, 24-bit, or 32-bit ADC modules.

[0025] In conjunction with the first aspect, in some implementations of the first aspect, the M power supply circuits and the M amplifier circuits include metal-oxide-semiconductor field-effect transistors, wherein the metal-oxide-semiconductor field-effect transistors are gallium nitride transistors.

[0026] In this embodiment of the application, by setting gallium nitride (GaN) transistors in the M power supply circuits and M amplifier circuits, the power supply circuits and amplifier circuits can obtain smaller on-resistance, thereby improving the power amplifier efficiency of the power amplifier system. Furthermore, the use of GaN transistors can also enable the vehicle power amplifier system to obtain higher switching efficiency and reduce the distortion of the vehicle power amplifier system.

[0027] Secondly, a control system is provided, comprising: a controller, N power supply circuits, M amplification circuits, and M loudspeakers. The controller is connected to the M loudspeakers via the N power supply circuits and the M amplification circuits. The N power supply circuits supply power to the M amplification circuits, and the M amplification circuits amplify the voltage of a modulation signal output by the controller. M and N are positive integers, and N is less than or equal to M. The controller is configured to: acquire a first modulation signal and N first voltage values, wherein the first modulation signal is a modulation signal obtained by modulating an audio signal, and the N first voltage values ​​are associated with the first modulation signal, and the N... The first voltage value is the voltage value when the N power supply circuits supply power to the M amplifier circuits; based on the first modulation signal and the N first voltage values, N second modulation signals are determined; based on the N second modulation signals, M first audio modulation signals are output to the M amplifier circuits, and the oscillation degree of the duty cycle of the M first audio modulation signals is lower than that of the first modulation signal; the M amplifier circuits are used to: amplify the voltage of the M first audio modulation signals to obtain M second audio modulation signals; output the M second audio modulation signals to the M speakers; the M speakers are used to generate sound based on the M second audio modulation signals.

[0028] In conjunction with the second aspect, in some implementations of the second aspect, the controller is further configured to acquire N first current values, the N first current values ​​being associated with the first modulation signal, and the N first current values ​​being the current values ​​when the N power supply circuits supply power to the M amplifier circuits; specifically, the controller is configured to determine the N second modulation signals based on the first modulation signal, the N first voltage values, and the N first current values.

[0029] In conjunction with the second aspect, in some implementations of the second aspect, the controller is further configured to: acquire M second current values, the M second current values ​​being current values ​​when the M speakers operate based on the M second audio modulation signals; output M third audio modulation signals to the M amplifier circuits according to the M first audio modulation signals and the M second current values, the duty cycle oscillation of the M third audio modulation signals being lower than that of the M first audio modulation signals; the M amplifier circuits are further configured to: amplify the voltage of the third audio modulation signals to obtain M fourth audio modulation signals; output the M fourth audio modulation signals to the M speakers; and the M speakers are further configured to generate sound based on the M fourth audio modulation signals.

[0030] In conjunction with the second aspect, in some implementations of the second aspect, the M amplification circuits are connected to the M loudspeakers through M filter circuits, and the M filter circuits include M first acquisition units, which are used to acquire the M second current values.

[0031] In conjunction with the second aspect, in some implementations of the second aspect, the controller is further configured to acquire M second voltage values, the M second voltage values ​​being the voltage values ​​of the M speakers operating based on the M second audio modulation signals; specifically, the controller is configured to output the M third audio modulation signals to the M amplifier circuits based on the M first audio modulation signals, the M second current values, and the M second voltage values.

[0032] In conjunction with the second aspect, in some implementations of the second aspect, the controller is further connected in series with the M speakers through the M voltage feedback circuits, the M voltage feedback circuits including M second acquisition units, the M second acquisition units being used to acquire the M second voltage values.

[0033] In conjunction with the second aspect, in some implementations of the second aspect, the M power supply circuits and the M amplifier circuits include metal-oxide-semiconductor field-effect transistors, wherein the metal-oxide-semiconductor field-effect transistors are gallium nitride transistors.

[0034] Thirdly, a control device is provided, comprising: at least one processor and a memory, wherein the at least one processor is coupled to the memory for reading and executing instructions in the memory, such that the device implements the method in any of the implementations of the first aspect described above.

[0035] Fourthly, a computer-readable storage medium is provided, the computer-readable storage medium storing program code, which, when run on a computer, causes the computer to perform the method in any of the implementations of the first aspect described above.

[0036] Fifthly, a chip is provided, the chip including circuitry for performing the method in any of the implementations of the first aspect described above.

[0037] Sixthly, a computer program product is provided, the computer product including a computer program that, when the computer program is run by a processor, causes the method in any of the implementations of the first aspect to be executed.

[0038] In a seventh aspect, a vehicle is provided, comprising: a system according to any of the implementations of the second aspect above, or an apparatus according to the third aspect above. Attached Figure Description

[0039] Figure 1 is a functional schematic diagram of the vehicle provided in an embodiment of this application;

[0040] Figure 2 is a schematic diagram of using pulse width modulation technology to convert digital signals into high-frequency pulse signals according to an embodiment of this application;

[0041] Figure 3 is a schematic diagram of the architecture of a Class D power amplifier system provided in an embodiment of this application;

[0042] Figure 4 is a schematic flowchart of a control method provided in an embodiment of this application;

[0043] Figure 5 is a control system provided in an embodiment of this application;

[0044] Figure 6 shows another control system provided in an embodiment of this application;

[0045] Figure 7 shows another control system provided in an embodiment of this application;

[0046] Figure 8 shows another control system provided in an embodiment of this application;

[0047] Figure 9 shows another control system provided in an embodiment of this application;

[0048] Figure 10 is a schematic diagram of a control device provided in an embodiment of this application. Detailed Implementation

[0049] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0050] In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. In this application, "at least one" means one or more, and "more" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0051] The use of prefixes such as "first" and "second" in this application embodiment is solely for distinguishing different descriptive objects and does not limit the position, order, priority, quantity, or content of the described objects. The use of ordinal numbers and other prefixes to distinguish descriptive objects in this application embodiment does not constitute a limitation on the described objects. The description of the described objects is found in the claims or the context of the embodiments, and the use of such prefixes should not constitute unnecessary restrictions.

[0052] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0053] Figure 1 is a functional schematic diagram of a vehicle 100 provided in an embodiment of this application.

[0054] Vehicle 100 may include various subsystems, such as a sensing system 120, a computing platform 130, and a power amplifier system 140. Optionally, vehicle 100 may include more or fewer subsystems, and each subsystem may include one or more components. In addition, each subsystem and component of vehicle 100 may be interconnected via wired or wireless means.

[0055] The perception system 120 may include several types of sensors for sensing information about the environment surrounding the vehicle 100. For example, the perception system 120 may include a positioning system, which may be a global positioning system (GPS), a BeiDou system, or another positioning system. The perception system 120 may include one or more of the following: an inertial measurement unit (IMU), lidar, millimeter-wave radar, ultrasonic radar, and a camera device.

[0056] Some or all of the functions of vehicle 100 can be controlled by computing platform 130. Computing platform 130 may include processors 131 to 13n (n being a positive integer). A processor is a circuit with signal processing capabilities. In one implementation, the processor can be a circuit with instruction read and execute capabilities, such as a central processing unit (CPU), microprocessor, graphics processing unit (GPU) (which can be understood as a type of microprocessor), or digital signal processor (DSP). In another implementation, the processor can implement certain functions through the logical relationships of hardware circuits. These logical relationships are fixed or reconfigurable. For example, the processor may be a hardware circuit implemented using an application-specific integrated circuit (ASIC) or a programmable logic device (PLD), such as an FPGA. In reconfigurable hardware circuits, the process of the processor loading a configuration document and configuring the hardware circuit can be understood as the process of the processor loading instructions to implement some or all of the functions of the aforementioned units. Furthermore, the processor can also be a hardware circuit designed for artificial intelligence, which can be understood as an ASIC, such as a neural network processing unit (NPU), tensor processing unit (TPU), deep learning processing unit (DPU), etc. In addition, the computing platform 130 may also include a memory for storing instructions. Some or all of the processors 131 to 13n can call the instructions in the memory to implement the corresponding functions.

[0057] The computing platform 130 can control the functions of the vehicle 100 based on inputs received from various subsystems (e.g., the sensing system 120). In some embodiments, the computing platform 130 can be used to provide control over many aspects of the vehicle 100 and its subsystems.

[0058] The amplifier system 140 provides audio processing capabilities and drives the speakers, providing the necessary power and sound quality for the in-vehicle audio system, allowing passengers to enjoy a high-quality music and sound experience.

[0059] Optionally, the above components are just an example. In actual applications, the components in each of the above modules may be added or deleted as needed.

[0060] The vehicle 100 in this application may include: road vehicles, water vehicles, air vehicles, industrial equipment, agricultural equipment, or entertainment equipment, etc. For example, vehicle 100 may be a means of transportation (such as commercial vehicles, passenger cars, motorcycles, flying cars, trains, etc.), industrial vehicles (such as forklifts, trailers, tractors, etc.), engineering vehicles (such as excavators, bulldozers, cranes, etc.), agricultural equipment (such as lawnmowers, harvesters, etc.), amusement equipment, toy vehicles, etc. The embodiments of this application do not specifically limit the type of vehicle.

[0061] The following uses vehicle 100 as an example of an intelligent vehicle to illustrate the technical problems that this application needs to solve and the technical solutions adopted.

[0062] As smart cars become more widely used in daily life, users expect them and related devices to provide a more comfortable and intelligent experience. Against this backdrop, in-vehicle amplifiers are gaining increasing popularity among users.

[0063] Currently, most automotive amplifier products use Class D amplifier technology (also known as digital amplifier technology), as shown in Figures 2 and 3. Its working principle involves converting analog signals into digital signals through sampling and quantization, then using pulse-width modulation (PWM) technology to convert them into high-frequency pulse signals. The audio signal is represented by its duty cycle, and finally, a filter converts the pulse signal back into an analog signal for output. Because Class D amplifier technology modulates the signal into a duty cycle, the strength of the output signal is proportional to the width of the signal pulse. Therefore, the accuracy of the output signal is affected by the precision of the duty cycle control.

[0064] Two key metrics for evaluating power amplifier performance are signal distortion rate and power amplifier efficiency. Signal distortion rate, described by total harmonic distortion plus noise (THD+N), is the ratio of the Nth harmonic and noise components to the input signal. A lower THD indicates better power amplifier performance. Power amplifier efficiency represents the ratio of output power to input power. Higher efficiency means less energy loss and heat generation during operation, resulting in better overall performance. The precision of PWM signal control and the switching performance of the metal-oxide-semiconductor (MOSFET) transistors directly impact both signal distortion rate and power amplifier efficiency.

[0065] However, in high-power scenarios (e.g., over 300W per channel), the application of Class D amplifier technology may lead to severe amplifier overheating, high distortion of the audio signal, and reduced amplifier efficiency, thereby affecting the user's audio experience.

[0066] This application provides a control method, system, and vehicle that enable in-vehicle power amplifier products to achieve higher power amplifier efficiency and reduce overall signal distortion in high-power scenarios.

[0067] Figure 4 is a schematic flowchart of a control method provided in an embodiment of this application. The execution subject of method 400 can be a vehicle or a controller. When the execution subject of method 400 is a vehicle 100, it can be executed by a computing platform 130 in the vehicle 100, or by a system-on-chip (SoC) in the computing platform 130, or by a processor in the computing platform 130. The following describes method 400 with a controller as the execution subject. Method 400 can include steps S401 to S403.

[0068] S401, acquire the first modulation signal and N first voltage values.

[0069] The controller can be connected to M speakers through N power supply circuits and M amplifier circuits. The N power supply circuits are used to power the M amplifier circuits, and the M amplifier circuits are used to amplify the voltage of the modulation signal output by the controller. M and N are positive integers, and N is less than or equal to M.

[0070] Optionally, the connection between the controller and the M speakers can be an electrical connection or a connection in other ways (e.g., wired or wireless connection), and this application does not limit the connection method.

[0071] In one possible implementation, the N power supply circuits and M amplifier circuits include metal-oxide-semiconductor field-effect transistors (MOSFETs), specifically gallium nitride (GaN) transistors. This allows the power supply and amplifier circuits to achieve lower on-resistance, thereby improving the power amplifier system's efficiency. Furthermore, the use of GaN transistors can also enable the automotive power amplifier system to achieve higher switching efficiency and reduce distortion.

[0072] Among them, N first voltage values ​​are associated with the first modulation signal, and the N first voltage values ​​are the voltage values ​​when N power supply circuits supply power to M amplifier circuits.

[0073] Optionally, the association of N first voltage values ​​with the first modulation signal can be understood as follows: the N first voltage values ​​are the voltage values ​​when N power supply circuits supply power to M amplifier circuits according to the first modulation signal.

[0074] Optionally, the N power supply circuits can feed back N first voltage values ​​to the controller through the N power supply voltage feedback circuits. Correspondingly, the controller can obtain the N first voltage values ​​through the N power supply voltage feedback circuits.

[0075] For example, when one power supply circuit powers three amplifier circuits based on the first modulation signal, this single power supply circuit can feed back a first voltage value to the controller. As another example, when three power supply circuits power three amplifier circuits respectively based on the first modulation signal, each of the three power supply circuits can feed back a first voltage value to the controller; the values ​​of the first voltage values ​​fed back by these three power supply circuits can be the same. Yet another example: when the first power supply circuit powers the first and second amplifier circuits based on the first modulation signal, and the second power supply circuit powers the third amplifier circuit based on the first modulation signal, the first and second power supply circuits can each feed back a first voltage value to the controller; the values ​​of these two first voltage values ​​can be different.

[0076] S402, determine N second modulation signals based on the first modulation signal and N first voltage values.

[0077] Among them, the N second modulation signals can be understood as power supply modulation signals, that is, the controller can control N power supply circuits to supply power to M amplifier circuits based on the N second modulation signals;

[0078] In one possible implementation, before step S402, the controller acquires N first current values, which are associated with a first modulation signal, and these N first current values ​​are the current values ​​when N power supply circuits supply power to M amplifier circuits. Then, in step S402, the controller can determine N second modulation signals based on the first modulation signal, the N first voltage values, and the N first current values. In this way, because the N first current values ​​fed back from the N power supply circuits are additionally considered, the stability of the M first audio modulation signals subsequently obtained based on the N second modulation signals is also better.

[0079] Optionally, the controller can obtain the above N first current values ​​through N power supply current feedback circuits.

[0080] S403 outputs M first audio modulation signals to M amplifier circuits based on N second modulation signals.

[0081] Among them, the oscillation degree of the duty cycle of the M first audio modulation signals is lower than that of the first modulation signal.

[0082] Optionally, the controller can first determine M first audio modulation signals based on N second modulation signals, and then output M first audio modulation signals to M amplifier circuits.

[0083] Optionally, the fact that the duty cycle oscillation of the M first audio modulation signals is lower than that of the first modulation signal can be understood as: the M first audio modulation signals can reach a stable state faster than the first modulation signal, that is, the M first audio modulation signals have better stability.

[0084] In one possible implementation, M amplifier circuits can amplify the voltage of M first audio modulation signals to obtain M second audio modulation signals, and output the M second audio modulation signals to M speakers, which can then generate sound based on the M second audio modulation signals.

[0085] In one possible implementation, after step S403, method 400 further includes: acquiring M second current values, wherein the M second current values ​​are the current values ​​of the M speakers operating based on the M second audio modulation signals, and the M second audio modulation signals are modulation signals obtained by voltage amplification of the M first audio modulation signals through M amplification circuits; and outputting M third audio modulation signals to the M amplification circuits based on the M first audio modulation signals and the M second current values, wherein the duty cycle oscillation of the M third audio modulation signals is lower than that of the M first audio modulation signals. In this way, since the controller can anticipate the impedance characteristic changes of the M speakers based on the M second current values, the use of the third audio modulation signals can better address the impedance characteristic changes of the M speakers, reduce the side effects caused by the inductance characteristics of the M speakers, and further reduce the distortion rate of the vehicle amplifier system.

[0086] Optionally, the controller can obtain M second voltage values ​​through M voltage feedback circuits corresponding to M speakers.

[0087] In one possible implementation, when M amplifier circuits are connected to M loudspeakers through M filter circuits, the M filter circuits may include M first acquisition units, which are used to acquire M second current values.

[0088] Optionally, the aforementioned M first acquisition units may be M acquisition chips. The M first acquisition units may be deployed in M ​​filter circuits, between the M filter circuits and the M speakers, or after the M speakers.

[0089] In one possible implementation, after step S403, method 400 further includes: acquiring M second voltage values, where the M second voltage values ​​are the voltage values ​​of the M speakers operating based on the M second audio modulation signals; and outputting M third audio modulation signals to the M amplifier circuits based on the M first audio modulation signals and the M second current values, including: outputting M third audio modulation signals to the M amplifier circuits based on the M first audio modulation signals, the M second current values, and the M second voltage values. In this way, the controller can more accurately determine the impedance characteristic changes of the M speakers based on the M second current values ​​and the M second voltage values, thereby enabling the output of more stable third audio modulation signals.

[0090] Optionally, the controller can obtain the above-mentioned M second voltage values ​​through M voltage feedback circuits corresponding to M speakers.

[0091] In one possible implementation, the controller can also be connected to M speakers via M voltage feedback circuits, each of which includes M second acquisition units for acquiring M second voltage values.

[0092] In one possible implementation, the M second acquisition units can be M high-precision ADC modules, such as 12-bit, 24-bit, or 32-bit ADC modules.

[0093] In this embodiment, the controller can obtain N second modulation signals based on the first modulation signal and N first voltage values ​​fed back from the N power supply circuits, and output M first audio modulation signals to the M amplifier circuits based on the N second modulation signals, so as to ensure that the M amplifier circuits stably drive the speaker based on the M first audio modulation signals. In this way, because the first audio modulation signal has better stability, the vehicle power amplifier product can achieve higher power amplifier efficiency in high-power scenarios and reduce overall signal distortion.

[0094] It should be understood that, in the various embodiments of this application, unless otherwise specified or in case of logical conflict, the terms and / or descriptions between the various embodiments are consistent and can be referenced by each other, and the technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0095] This application embodiment also provides a control system, which includes: a controller, N power supply circuits, M amplifier circuits, and M speakers. The controller is connected to the M speakers through the N power supply circuits and the M amplifier circuits. The N power supply circuits supply power to the M amplifier circuits, and the M amplifier circuits amplify the voltage of the modulation signal output by the controller. M and N are positive integers, and N is less than or equal to M. The controller is configured to: acquire a first modulation signal and N first voltage values, wherein the first modulation signal is a modulation signal obtained by modulating an audio signal, and the N first voltage values ​​are associated with the first modulation signal. The N first voltage values ​​are the voltage values ​​when the N power supply circuits supply power to the M amplifier circuits; based on the first modulation signal and the N first voltage values, N second modulation signals are determined; based on the N second modulation signals, M first audio modulation signals are output to the M amplifier circuits, and the oscillation degree of the duty cycle of the M first audio modulation signals is lower than that of the first modulation signal; the M amplifier circuits are used to: amplify the voltage of the M first audio modulation signals to obtain M second audio modulation signals; output the M second audio modulation signals to the M speakers; the M speakers are used to generate sound based on the M second audio modulation signals.

[0096] The system architecture of the above control system is described in detail below with reference to Figures 5 to 7. In Figures 5 to 7, M = N = 1.

[0097] In one embodiment, as shown in FIG5, the control system may include: a controller 501, a power supply circuit 502, an amplifier circuit 503, a filter circuit 504, and a power supply voltage feedback circuit 505. The N power supply circuits may include power supply circuits 502, and the M amplifier circuits may include amplifier circuits 503.

[0098] The controller 501 may include a power amplifier modulation module, a power control module, an ADC module, and a PWM modulation module.

[0099] The controller 501 can pre-buffer data based on the audio input (e.g., an audio signal) and perform peak detection on the audio input over a period of time. It adjusts the output voltage level of the power supply circuit 502 based on the peak value of the audio signal and simultaneously calculates the matching audio signal value. Then, the controller 501 can perform PWM modulation on the audio signal by first oversampling and then quantizing, and control the PWM modulation module to output the signal (the output signal can correspond to the first modulation signal). Furthermore, the controller 501 can use the ADC module to acquire the feedback voltage (i.e., the first voltage value) of the power supply circuit 502 to control the output of the PWM modulation module, thereby enabling the power amplifier system to obtain a more accurate and stable power supply. The PWM modulation method of first oversampling and then quantizing can be understood as: digitizing the analog signal using PWM modulation technology, increasing the sampling rate through oversampling, and improving the accuracy of individual audio data points through superimposed quantization, thereby achieving low-distortion reconstruction of the signal.

[0100] The power supply circuit 502 can output power according to the PWM modulation signal output by the controller 501 to power the amplifier circuit 503. Furthermore, the controller 501 can optimize the output control of the PWM modulation module by detecting the first voltage value output by the power feedback circuit 505 (that is, obtain the second modulation signal and output the first audio modulation signal based on the second modulation signal).

[0101] Amplifier circuit 503 can amplify voltage and act as a switch based on the PWM modulation signal output by controller 501 (for example, in a single-supply amplifier circuit, when the PWM modulation signal is high, amplifier circuit 503 acts as a switch to turn on, supplying power; or when the PWM modulation signal is low, amplifier circuit 503 acts as a switch to turn off, supplying no power; in a dual-supply amplifier circuit, when the PWM modulation signal is high, amplifier circuit 503 turns on the positive power supply and turns off the negative power supply, supplying power to the positive power supply; when the modulation signal is low, amplifier circuit 503 turns off the positive power supply and turns on the negative power supply, supplying power to the negative power supply). Optionally, low-on-resistance MOSFETs (e.g., gallium nitride transistors) can be used in power supply circuit 502 and amplifier circuit 503 to improve operating efficiency.

[0102] The filter circuit 504 can filter and demodulate the signal output by the amplifier circuit 503, and then output the result (i.e. the second audio modulation signal) to the speaker.

[0103] In the above control system, in addition to feeding back the voltage value of their own power supply to the controller, the N power supply circuits can also feed back the current value of their own power supply to the controller, so that the controller can obtain the second modulation signal more accurately.

[0104] In one possible implementation, in this control system, the controller is further configured to acquire N first current values, which are associated with a first modulation signal, and the N first current values ​​are current values ​​when N power supply circuits supply power to M amplifier circuits; specifically, the controller is configured to determine N second modulation signals based on the first modulation signal, the N first voltage values, and the N first current values.

[0105] For example, as shown in Figure 5, the system architecture may include a power current feedback circuit 506, which is used to feed back a first current value to the controller 501. The controller 501 can optimize the output control of the PWM modulation module (i.e., obtain a second modulation signal and output a first audio modulation signal based on the second modulation signal) by detecting the first current value output by the power current feedback circuit.

[0106] In the above control system, the M speakers can also feed back their voltage and / or current values ​​during operation to the controller so that the controller can perform signal modulation.

[0107] In one possible implementation, in this control system, the controller is further configured to: acquire M second current values, the M second current values ​​being the current values ​​of the M speakers operating based on the M second audio modulation signals; output M third audio modulation signals to M amplifier circuits based on the M first audio modulation signals and the M second current values, the duty cycle oscillation of the M third audio modulation signals being lower than that of the M first audio modulation signals; the M amplifier circuits are further configured to: amplify the M third audio modulation signals to obtain M fourth audio modulation signals; output the M fourth audio modulation signals to the M speakers; and the M speakers are further configured to generate sound based on the M fourth audio modulation signals.

[0108] In one possible implementation, the controller is further configured to acquire M second voltage values, the M second voltage values ​​being the voltage values ​​of the M speakers operating based on the M second audio modulation signals; specifically, the controller is configured to output M third audio modulation signals to the M amplifier circuits based on the M first audio modulation signals, the M second current values, and the M second voltage values.

[0109] Optionally, the aforementioned M second current values ​​can be obtained through M current feedback circuits corresponding to the speaker, and the aforementioned M second voltage values ​​can be obtained through M voltage feedback circuits corresponding to the speaker.

[0110] For example, as shown in Figure 5, the system architecture may include a voltage feedback circuit 507 and a current feedback circuit 508. The voltage feedback circuit 507 and the current feedback circuit 508 can be used to feed back the voltage (i.e., the second voltage value) and current (i.e., the second current value) of the speaker during operation to the controller 501, where the ADC module in the controller 501 performs data acquisition. After obtaining the second voltage value and the second current value, the controller 501 can optimize the first audio modulation signal to obtain a third audio modulation signal, and output the third audio modulation signal to the amplifier circuit 503.

[0111] For example, as shown in Figure 6, the system architecture in Figure 6 omits the current feedback circuit 508 compared to the system architecture in Figure 5. Although this may result in a relatively high distortion rate of the audio signal output by the speaker, this architecture can save costs.

[0112] In one possible implementation, the M filter circuits include M first acquisition units, which are used to acquire M second current values.

[0113] Optionally, the aforementioned M first acquisition units may be M acquisition chips. The M first acquisition units may be deployed in M ​​filter circuits, between the M filter circuits and the M speakers, or after the M speakers.

[0114] For example, in Figures 5 and 6, the first acquisition unit can be deployed in the filter circuit 504, between the filter circuit 504 and the speaker, or after the speaker.

[0115] In one possible implementation, when the controller is connected to the speaker via M voltage feedback circuits, the M voltage feedback circuits include M second acquisition units, which are used to acquire M second voltage values.

[0116] Optionally, the second acquisition unit can be a high-precision ADC module.

[0117] For example, as shown in Figure 7, compared with the system architecture in Figure 5, the system architecture in Figure 7 adds a high-precision ADC 701 module (e.g., a 32-bit ADC module) to replace the built-in ADC module (e.g., a 12-bit ADC module) in the controller 501. In this way, the controller 501 can obtain higher precision voltage feedback results, thereby better controlling the output of the PWM modulation module and further improving the power amplifier performance of the speaker.

[0118] The following section, in conjunction with Figures 8 and 9, details the system architecture of a controller that controls the operation of multiple speakers.

[0119] In one embodiment, as shown in Figure 8, the system architecture of Figure 8, compared to that of Figure 5, adds at least one additional power amplifier system, meaning that N = M is greater than or equal to 2. Correspondingly, within the controller 501, there are also M ADC modules and PWM modules. In each power amplifier system, the power supply circuit 502 can supply power to the amplifier circuit 503 and feed back a first voltage value and / or a first current value to the controller 501. This system architecture can control multiple power amplifier systems simultaneously for audio amplification through a single controller 501, avoiding the need for multiple controllers to control multiple power amplifier systems separately, thereby saving product space and controller manufacturing costs.

[0120] It should be understood that the above-mentioned power amplifier system may include: power supply circuit, amplification circuit, filtering circuit, power supply voltage feedback circuit, power supply current feedback circuit, voltage feedback circuit corresponding to the speaker, and current feedback circuit corresponding to the speaker.

[0121] In one embodiment, as shown in Figure 9, the system architecture of Figure 9, compared to that of Figure 5, adds at least one additional power amplifier system. However, only one power supply circuit 502 is needed to power the amplification circuit 503 in each power amplifier system and feed back a first voltage value and / or a first current value to the controller 501. That is, N=1 and M is greater than or equal to 2. Correspondingly, the controller 501 also has M ADC modules and PWM modules. This system architecture can control multiple power amplifier systems for audio amplification simultaneously through one controller 501, avoiding the need for multiple controllers to control multiple power amplifier systems separately. This saves on the number of power supply circuits and reduces the complexity of the entire control system.

[0122] It should be understood that the control systems shown in Figures 5 to 9 in this application are merely illustrative examples, and those skilled in the art can modify or replace the architecture shown in Figures 5 to 9 according to actual needs. For example, the quantities of N and M can be changed.

[0123] It should be understood that, in the various embodiments of this application, unless otherwise specified or in case of logical conflict, the terms and / or descriptions between the various embodiments are consistent and can be referenced by each other, and the technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0124] Figure 10 is a schematic diagram of a control device 1000 provided in an embodiment of this application.

[0125] The device 1000 includes a memory 1010, a processor 1020, and a communication interface 1030. The memory 1010, processor 1020, and communication interface 1030 are connected via an internal connection path. The memory 1010 stores instructions, and the processor 1020 executes the instructions stored in the memory 1010 to control the communication interface 1030 to acquire information, thereby enabling the device 1000 to implement the aforementioned control method. Optionally, the memory 1010 can be coupled to the processor 1020 via an interface, or it can be integrated with the processor 1020.

[0126] It should be noted that the communication interface 1030 described above uses a transceiver device, such as, but not limited to, a transceiver. The communication interface 1030 may also include an input / output interface.

[0127] The processor 1020 stores one or more computer programs, which include instructions. When the instructions are executed by the processor 1020, the control device 1000 performs the control methods described in the above embodiments.

[0128] In implementation, each step of the above method can be completed by the integrated logic circuitry of the hardware in the processor 1020 or by instructions in software form. The method disclosed in the embodiments of this application can be directly implemented by the hardware processor, or by a combination of hardware and software modules in the processor. The software modules can reside in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. This storage medium is located in memory 1010, and the processor 1020 reads the information in memory 1010 and, in conjunction with its hardware, completes the steps of the above method. To avoid repetition, detailed descriptions are not provided here.

[0129] Alternatively, the device 1000 may be located in the vehicle 100 in Figure 1.

[0130] Alternatively, the device 1000 can be the computing platform 130 in the vehicle of Figure 1.

[0131] This application also provides a computer-readable storage medium storing program code that, when executed on a computer, causes the computer to perform the method shown in FIG4 above.

[0132] This application also provides a computer program product, which includes a computer program. When the computer program is run by a processor, the method shown in FIG4 above is executed.

[0133] This application also provides a chip, including a circuit for performing the method shown in FIG4 above.

[0134] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0135] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0136] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0137] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0138] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0139] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0140] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A control method characterized by, The method is applied to a controller connected with M speakers through N power supply circuits and M amplification circuits, the N power supply circuits are used for supplying power for the M amplification circuits, the M amplification circuits are used for voltage amplification of a modulation signal output by the controller, M and N are positive integers, N is less than or equal to M, and the method comprises the following steps: obtaining a first modulation signal and N first voltage values, the first modulation signal is a modulation signal obtained by modulating an audio signal, the N first voltage values are associated with the first modulation signal, and the N first voltage values are voltage values when the N power supply circuits supply power for the M amplification circuits; determining N second modulation signals according to the first modulation signal and the N first voltage values; outputting M first audio modulation signals to the M amplification circuits according to the N second modulation signals, and the oscillation degree of the duty cycle of the M first audio modulation signals is lower than that of the first modulation signal.

2. The method of claim 1, wherein, The method further comprises the following steps: obtaining N first current values, the N first current values are associated with the first modulation signal, and the N first current values are current values when the N power supply circuits supply power for the M amplification circuits; determining the N second modulation signals according to the first modulation signal, the N first voltage values and the N first current values. The method further comprises the following steps:

3. The method of claim 1 or 2, wherein, obtaining M second current values, the M second current values are current values when the M speakers work based on M second audio modulation signals, and the M second audio modulation signals are modulation signals obtained by voltage amplification of the M first audio modulation signals through the M amplification circuits; outputting M third audio modulation signals to the M amplification circuits according to the M first audio modulation signals and the M second current values, and the oscillation degree of the duty cycle of the M third audio modulation signals is lower than that of the M first audio modulation signals. The M amplification circuits are connected with the M speakers through M filter circuits, and the M filter circuits comprise M first acquisition units, and the M first acquisition units are used for acquiring the M second current values.

4. The method of claim 3, wherein, The method further comprises the following steps:

5. The method of claim 3 or 4, wherein, obtaining M second voltage values, the M second voltage values are voltage values when the M speakers work based on the M second audio modulation signals; outputting the M third audio modulation signals to the M amplification circuits according to the M first audio modulation signals, the M second current values and the M second voltage values. The controller is further connected with the M speakers through the M voltage feedback circuits, the M voltage feedback circuits comprise M second acquisition units, and the M second acquisition units are used for acquiring the M second voltage values. ​ 6. The method of claim 5, wherein, ​ 7. The method according to any one of claims 1 to 6, wherein, The M power supply circuits and the M amplification circuits comprise metal oxide semiconductor field effect transistors, and the metal oxide semiconductor field effect transistors are gallium nitride tubes.

8. A control system characterized by, The system comprises a controller, N power supply circuits, M amplification circuits and M speakers, the controller is connected with the M speakers through the N power supply circuits and the M amplification circuits, the N power supply circuits are used for supplying power for the M amplification circuits, the M amplification circuits are used for voltage amplification of a modulation signal output by the controller, M and N are positive integers, and N is less than or equal to M. The controller is configured to: obtain a first modulation signal and N first voltage values, the first modulation signal is a modulation signal obtained by modulating an audio signal, the N first voltage values are associated with the first modulation signal, and the N first voltage values are voltage values when the N power supply circuits supply power for the M amplification circuits; determine N second modulation signals according to the first modulation signal and the N first voltage values; output M first audio modulation signals to the M amplification circuits according to the N second modulation signals, and an oscillation degree of a duty cycle of the M first audio modulation signals is lower than that of the first modulation signal; the M amplification circuits are configured to: perform voltage amplification on the M first audio modulation signals to obtain M second audio modulation signals; output the M second audio modulation signals to the M speakers; and the M speakers are configured to generate sound according to the M second audio modulation signals.

9. The system of claim 8, wherein the controller is further configured to obtain N first current values, the N first current values are associated with the first modulation signal, and the N first current values are current values when the N power supply circuits supply power for the M amplification circuits; the controller is specifically configured to determine the N second modulation signals according to the first modulation signal, the N first voltage values and the N first current values.

10. The system of claim 8, wherein the controller is further configured to: obtain M second current values, the M second current values are current values when the M speakers work based on the M second audio modulation signals; output M third audio modulation signals to the M amplification circuits according to the M first audio modulation signals and the M second current values, and an oscillation degree of a duty cycle of the M third audio modulation signals is lower than that of the M first audio modulation signals; the M amplification circuits are further configured to: perform voltage amplification on the M third audio modulation signals to obtain M fourth audio modulation signals; output the M fourth audio modulation signals to the M speakers; and the M speakers are further configured to generate sound according to the M fourth audio modulation signals.

11. The system of claim 10, wherein, The M amplification circuits are connected with the M speakers through M filter circuits, and the M filter circuits comprise M first acquisition units, and the M first acquisition units are used for acquiring the M second current values.

12. The system of claim 11, wherein the controller is further configured to obtain M second voltage values, the M second voltage values being voltage values of the M speakers when operating based on the M second audio modulation signals. The controller is specifically configured to output the M third audio modulation signals to the M amplification circuits according to the M first audio modulation signals, the M second current values and the M second voltage values. The controller is further connected with the M speakers in series through the M voltage feedback circuits, and the M voltage feedback circuits comprise M second acquisition units configured to acquire the M second voltage values.

13. The system of claim 12, wherein, The M power supply circuits and the M amplification circuits comprise metal oxide semiconductor field effect transistors, and the metal oxide semiconductor field effect transistors are gallium nitride tubes.

14. The system of any one of claims 8 to 13, wherein, The chip comprises a circuit configured to execute the method of any one of claims 1 to 7.

15. A control device characterized by comprising: The computer readable storage medium stores program codes, and when the program codes are run on a computer, the computer is caused to execute the method of any one of claims 1 to 7.

16. A chip, characterized by The computer product comprises a computer program, and when the computer program is run, the computer is caused to execute the method of any one of claims 1 to 7.

17. A computer-readable storage medium, characterized in that, The system of any one of claims 8 to 14, or the control device of claim 15.

18. A computer program product, characterised in that, ​ 19. A vehicle characterized by comprising: ​

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