CN117478080A - Audio power amplifier, automobile sound system and automobile - Google Patents

Abstract

The invention discloses an audio power amplifier, a car sound system and a car, wherein the car sound system comprises a battery and a host, the audio power amplifier comprises a main control circuit, an audio processing circuit and a voltage conversion circuit, the audio processing circuit is electrically connected with the main control circuit, and the audio processing circuit is used for receiving an audio signal output by the host, processing the audio signal and outputting a corresponding audio processing signal to the main control circuit; the input end of the voltage conversion circuit is electrically connected with the storage battery, and the controlled end of the voltage conversion circuit is electrically connected with the main control circuit; the main control circuit is used for receiving the audio processing signal and outputting a corresponding control signal to the voltage conversion circuit; and the voltage conversion circuit is used for carrying out voltage conversion on the output voltage of the storage battery according to the control signal and then outputting a corresponding power supply voltage signal. The invention aims to reduce the power loss of an audio power amplifier so as to prolong the service life of the audio power amplifier.

Description

Audio power amplifier, automobile sound system and automobile

Technical Field

The invention relates to the technical field of power amplifiers, in particular to an audio power amplifier, an automobile sound system and an automobile.

Background

In a traditional automobile sound system, an audio power amplifier is powered by adopting fixed voltage, and the voltage value for powering the audio power amplifier is far greater than the actual required voltage value in the scene of standard audio output or smaller power, so that the audio power amplifier generates more power consumption and simultaneously generates more heat consumption.

Disclosure of Invention

The invention mainly aims to provide an audio power amplifier, a car sound system and a car, and aims to reduce the power loss of the audio power amplifier so as to prolong the service life of the audio power amplifier.

In order to achieve the above object, the present invention provides an audio power amplifier applied to a car audio system, the car audio system including a battery and a main unit, the audio power amplifier comprising:

a main control circuit;

the audio processing circuit is electrically connected with the main control circuit and is used for receiving an audio signal output by the host, performing signal processing on the audio signal and outputting a corresponding audio processing signal to the main control circuit;

the input end of the voltage conversion circuit is electrically connected with the storage battery, and the controlled end of the voltage conversion circuit is electrically connected with the main control circuit;

the main control circuit is used for receiving the audio processing signals and outputting corresponding control signals to the voltage conversion circuit;

the voltage conversion circuit is used for converting the output voltage of the storage battery into voltage according to the control signal and outputting a corresponding power supply voltage signal.

Optionally, the audio power amplifier further comprises:

the input end of the amplifying circuit is electrically connected with the audio processing circuit, and the controlled end of the amplifying circuit is electrically connected with the main control circuit;

the amplifying circuit is used for receiving the audio processing signals, amplifying the audio processing signals according to preset amplification factors under the control of the main control circuit, and outputting corresponding audio amplified signals.

Optionally, the audio power amplifier includes:

a communication circuit having a communication terminal for establishing a communication connection with an external terminal, the communication circuit being electrically connected with an input terminal of the audio processing circuit;

the communication circuit is used for outputting the audio signal received by the communication circuit to the audio processing circuit.

Optionally, the amplifying circuit has a plurality of output terminals, and a plurality of output terminals of the amplifying circuit are respectively used for being correspondingly and electrically connected with a plurality of speakers, and the audio power amplifier further includes:

the input end of the detection circuit is correspondingly and electrically connected with the plurality of output ends of the amplifying circuit, and the output end of the detection circuit is electrically connected with the main control circuit;

the detection circuit is used for detecting output signals of the output ends of the amplifying circuits and outputting a plurality of detection signals to the main control circuit;

the main control circuit is also used for outputting corresponding detection result signals according to the detection signals.

Optionally, the detection circuit is further configured to detect output impedances of the output ends of the plurality of amplifying circuits, and output corresponding impedance detection signals to the master control circuit, so that the master control circuit determines whether the output ends of the plurality of amplifying circuits electrically connected with the plurality of speakers are in an open circuit state or a short circuit state according to the received plurality of impedance detection signals, and outputs corresponding first result signals.

Optionally, the detection circuit is further configured to detect output voltages of the output ends of the plurality of amplifying circuits, and output corresponding voltage detection signals to the master control circuit, so that the master control circuit determines, according to the received voltage detection signals, whether the output ends of the plurality of amplifying circuits electrically connected to the plurality of speakers are in a ground short circuit state or a power short circuit state, and outputs corresponding second result signals.

Optionally, the number of the amplifying circuits is multiple, and the input ends of the amplifying circuits are electrically connected with the audio processing circuit; the controlled ends of the amplifying circuits are electrically connected with the main control circuit; the audio power amplifier further comprises:

the input end of the OR gate circuit is electrically connected with the amplifying circuits, and the output end of the OR gate circuit is electrically connected with the main control circuit;

the main control circuit is used for outputting corresponding control signals to the voltage conversion circuit according to signals output by the OR gate circuit, so that the voltage conversion circuit performs voltage conversion on the output voltage of the storage battery according to the control signals and then outputs corresponding power supply voltage signals.

Optionally, the main control circuit is further configured to output the first result signal and the second result signal to an external terminal via a communication terminal of the communication circuit.

The invention also provides a car audio system, which comprises the audio power amplifier as set forth in any one of the above, and further comprises:

an external terminal in communication with the audio processing circuit;

the external terminal is used for outputting the audio signal to the audio processing circuit so that the audio processing circuit outputs an audio processing signal after performing signal processing on the received audio signal.

The invention further provides an automobile, and the automobile comprises the automobile sound system.

The invention provides an audio power amplifier which is applied to a car sound system, wherein the car sound system comprises a battery and a host, the audio power amplifier comprises a main control circuit, an audio processing circuit and a voltage conversion circuit, the audio processing circuit is electrically connected with the main control circuit, and the audio processing circuit is used for receiving an audio signal output by the host, processing the audio signal and outputting a corresponding audio processing signal to the main control circuit; the input end of the voltage conversion circuit is electrically connected with the storage battery, and the controlled end of the voltage conversion circuit is electrically connected with the main control circuit; the main control circuit is used for receiving the audio processing signal and outputting a corresponding control signal to the voltage conversion circuit; and the voltage conversion circuit is used for carrying out voltage conversion on the output voltage of the storage battery according to the control signal and then outputting a corresponding power supply voltage signal.

In practical application, the audio processing circuit is connected with an external host, the host sends an audio signal to the audio processing circuit, the audio processing circuit outputs the audio processing signal to the main control circuit after analyzing according to the audio signal, and the main control circuit controls the voltage conversion circuit to output a power supply voltage signal so as to supply power for the power utilization module in the audio power amplifier. Therefore, the audio processing circuit can output corresponding control signals according to the received audio signals, so that the voltage conversion circuit is controlled to convert the output voltage of the battery into a power supply voltage signal corresponding to the voltage actually required by the audio power amplifier, and further the power supply voltage of the audio power amplifier is dynamically regulated.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a circuit module of an audio power amplifier according to an embodiment of the invention;

FIG. 2 is a schematic circuit diagram of an audio power amplifier according to another embodiment of the present invention;

FIG. 3 is a schematic circuit diagram of an audio power amplifier according to another embodiment of the present invention;

FIG. 4 is a schematic circuit diagram of an audio power amplifier according to another embodiment of the present invention;

fig. 5 is a schematic circuit diagram of an audio power amplifier according to another embodiment of the invention.

Reference numerals illustrate:

reference numerals	Name of the name	Reference numerals	Name of the name
				10	Main control circuit	20	Audio processing circuit
30	Voltage conversion circuit	40	Amplifying circuit
				50	Communication circuit	60	Detection circuit
70	OR gate circuit

The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

In a traditional automobile sound system, an audio power amplifier is powered by adopting fixed voltage, and the voltage value for powering the audio power amplifier is far greater than the actual required voltage value in the scene of standard audio output or smaller power, so that the audio power amplifier generates more power consumption and simultaneously generates more heat consumption.

To this end, the present invention proposes an audio power amplifier applied to a car audio system including a battery and a main unit, and in one embodiment of the present invention, referring to fig. 1, the audio power amplifier includes:

a main control circuit 10;

the audio processing circuit 20 is electrically connected with the main control circuit 10, and the audio processing circuit 20 is used for receiving an audio signal output by a host, performing signal processing on the audio signal and outputting a corresponding audio processing signal to the main control circuit 10;

the input end of the voltage conversion circuit 30 is electrically connected with the storage battery, and the controlled end of the voltage conversion circuit 30 is electrically connected with the main control circuit 10;

the main control circuit 10 is configured to receive the audio processing signal and output a corresponding control signal to the voltage conversion circuit 30;

the voltage conversion circuit 30 is configured to perform voltage conversion on the output voltage of the storage battery according to the control signal, and output a corresponding power supply voltage signal.

In this embodiment, the audio processing circuit 20 and the main control circuit 10 may be implemented by a main controller, such as an MCU, a DSP (Digital Signal Process, digital signal processing Chip), an FPGA (Field Programmable Gate Array, programmable gate array Chip), a PLC, an SOC (System On Chip), or the like. The voltage conversion circuit 30 may be formed by at least one of a switching transistor, an inductor, and a capacitor, or may be implemented by a voltage conversion chip, such as a buck-boost chip.

Specifically, when the audio processing circuit 20 in the audio power amplifier of the present invention receives an audio signal from a host, signal processing such as sampling analysis, delay, filtering, etc. is performed on the audio signal, and then a corresponding audio processing signal is output to the main control circuit 10, so that the main control circuit 10 outputs a corresponding control signal to the voltage conversion circuit 30 via the GPIO control pin, and the voltage conversion circuit 30 performs voltage conversion on the output voltage of the storage battery according to the received control signal and then outputs a corresponding power supply voltage signal to supply power to the power module of the audio power amplifier. The power utilization module of the audio power amplifier includes, but is not limited to, an audio processing circuit 20 and a main control circuit 10. For example, the main control circuit 10 correspondingly adjusts the duty ratio of the square wave according to the amplitude gain of the audio signal (i.e. PWM principle), and outputs a corresponding PWM control signal to the voltage conversion circuit 30, so as to adjust the voltage value for supplying power to the audio power amplifier. It should be noted that a threshold value of the audio signal may be set, and the threshold value is set in advance by a developer. When the amplitude gain of the audio signal is higher than the threshold value, the main control circuit 10 outputs a corresponding PWM control signal to enable the power supply voltage signal output by the voltage conversion circuit 30 to be a large voltage signal, so that enough power supply for the audio power amplifier is ensured, and the audio power amplifier can work normally; when the amplitude gain of the audio signal is lower than the threshold value, a corresponding PWM control signal is output to the voltage conversion circuit 30, so that the power supply voltage signal output by the voltage conversion circuit 30 is a small voltage signal, and the voltage value of the power supply voltage signal for supplying power to the audio power amplifier is prevented from being far greater than the actual required voltage value of the audio power amplifier.

Through the arrangement, the voltage value of the power supply voltage signal for supplying power to the audio power amplifier can be prevented from being far greater than the voltage value actually required by the audio power amplifier, and the power loss of the audio power amplifier is reduced. In addition, no complex tracking software is required to be developed additionally, namely an external controller is not required to adjust the power supply voltage signal of the audio power amplifier, but the main control circuit 10 of the audio power amplifier realizes dynamic voltage control according to the audio signal, so that the working efficiency is improved, and the design cost is reduced.

The invention provides an audio power amplifier which is applied to a car sound system, wherein the car sound system comprises a battery and a host, the audio power amplifier comprises a main control circuit 10, an audio processing circuit 20 and a voltage conversion circuit 30, the audio processing circuit 20 is electrically connected with the main control circuit 10, the audio processing circuit 20 is used for receiving an audio signal output by the host, and outputting a corresponding audio processing signal to the main control circuit 10 after performing signal processing on the audio signal; the input end of the voltage conversion circuit 30 is electrically connected with the storage battery, and the controlled end of the voltage conversion circuit 30 is electrically connected with the main control circuit 10; the main control circuit 10 is configured to receive the audio processing signal and output a corresponding control signal to the voltage conversion circuit 30; the voltage conversion circuit 30 is configured to perform voltage conversion on the output voltage of the storage battery according to the control signal, and output a corresponding power supply voltage signal.

In practical application, the audio processing circuit 20 is connected with an external host, the host sends an audio signal to the audio processing circuit 20, the audio processing circuit 20 outputs an audio processing signal to the main control circuit 10 after analyzing according to the audio signal, and the main control circuit 10 controls the voltage conversion circuit 30 to output a power supply voltage signal to supply power to the power module in the audio power amplifier. In this way, the audio processing circuit 20 can output a corresponding control signal according to the received audio signal, so as to control the voltage conversion circuit 30 to convert the output voltage of the battery into a supply voltage signal corresponding to the voltage actually required by the audio power amplifier, thereby realizing dynamic adjustment of the supply voltage of the audio power amplifier.

It can be understood that the audio power amplifier can amplify the small-amplitude audio signal output by the host to a large enough amplitude to drive the loudspeaker to work, generate a loud sound, and further realize the playing function of the audio signal.

Thus, in one embodiment of the invention, referring to fig. 2, the audio power amplifier comprises:

an amplifying circuit 40, wherein an input end of the amplifying circuit 40 is electrically connected with the audio processing circuit 20, and a controlled end of the amplifying circuit 40 is electrically connected with the main control circuit 10;

the amplifying circuit 40 is configured to receive the audio processing signal, amplify the audio processing signal according to a preset amplification factor under the control of the main control circuit 10, and output a corresponding audio amplified signal.

In the present embodiment, the amplifying circuit 40 may be implemented using the above-described main controller or OCL (Output Condenser Less) amplifying circuit, differential amplifying circuit, BTL (Bridge Transformer Less) amplifying circuit, or the like.

Specifically, taking the audio processing signal as an example of DSP, when the audio processing circuit 20DSP receives the audio signal from the host, the DSP performs signal processing on the received audio signal and outputs a corresponding audio processing signal to the amplifying circuit 40, so that the amplifying circuit 40 amplifies the audio processing signal according to a preset amplification factor and outputs a corresponding audio amplifying signal to a speaker electrically connected with the amplifying circuit, so that the speaker plays. The preset amplification factor is set in advance by a researcher. It will be appreciated that in connection with the above embodiments, the supply voltage signal output by the voltage conversion circuit 30 may supply power to the amplifying circuit 40. It should be noted that the number of the output ends of the amplifying circuit 40 may be plural, so as to be electrically connected to the plural speakers respectively, and the main control module controls the amplifying circuit 40 to output corresponding audio amplifying signals to drive the plural speakers to play audio signals. In this way, a better stereo effect, a stronger low frequency response and a higher quality music experience can be achieved.

It should be noted that, the audio processing circuit 20DSP may perform signal processing on the received audio signal to implement various functions such as volume adjustment, volume following speed compensation control, tone setting, loudness compensation, sound field adjustment, and sound source restoration, so as to control the sound played by the speaker electrically connected to the output end of the amplifying circuit 40, thereby meeting the use requirement and music experience of the user.

In another embodiment of the present invention, referring to fig. 3, the audio power amplifier includes:

a communication circuit 50, the communication circuit 50 having a communication terminal for establishing a communication connection with an external terminal, the communication circuit 50 being electrically connected to an input terminal of the audio processing circuit 20;

the communication circuit 50 is configured to output an audio signal received via the communication circuit to the audio processing circuit 20.

In this embodiment, the communication circuit 50 may be implemented by using a wired communication module, for example, a LIN communication module, a CAN communication module, an RS485 transceiver chip, or the like, and selects a corresponding bus type according to the communication module. The communication module may also be implemented using a wireless communication module, such as a WiFi module, a bluetooth communication module, a 4G/5G module, etc.

Specifically, when a user needs to use the audio power amplifier of the present invention to play music, the external terminal may be electrically connected to the audio power amplifier via the communication module, and then the external terminal may send an audio signal to the audio processing circuit 20 in the audio power amplifier, so that the audio processing circuit 20 performs signal processing on the audio signal and outputs the audio processing signal to the amplifying circuit 40, and the amplifying circuit 40 amplifies the audio processing signal according to a preset amplification factor and outputs an audio amplified signal, so that the speaker plays the audio amplified signal. Therefore, the audio power amplifier can receive and play the audio signals output by different external terminals, and the application range and the practicability of the audio power amplifier are increased. The external terminal can be a mobile phone, a tablet, a computer and the like.

It should be noted that, the external terminal may be a mobile phone, a tablet, a computer, or the host computer described in the foregoing embodiments. For example, an A2B bus may be used to connect the host to the audio processing circuit 20 in a wired communication manner, the host A2B is used as a master node, the audio power amplifier A2B is used as a slave node, both of which can perform span transmission of audio signals, control signals, clock signals, etc. through a low-cost unshielded twisted pair UTP, the audio signals of the host are transmitted to the audio processing circuit 20 through the A2B bus, the audio processing circuit 20 outputs corresponding audio processing signals to the master control circuit 10, so that the master control circuit 10 outputs corresponding PWM control signals to the voltage conversion circuit 30, and the voltage conversion circuit 30 outputs power supply voltage signals according to the control signals to power the power utilization modules of the audio power amplifier. Meanwhile, the audio processing circuit 20 also outputs an audio processing signal to the amplifying circuit 40, and the amplifying circuit 40 amplifies the audio processing signal and outputs an audio amplified signal, so that the speaker plays the audio amplified signal. Thus, the audio signal received by the audio processing circuit 20 is not limited to the audio signal in the host, and the user can listen to the music of the external terminal, thereby enhancing the user experience.

In addition, the A2B bus is a vehicle-mounted high-bandwidth (50 Mbps), bidirectional and digital audio bus, adopts a daisy chain structure, is a single-Master (Master) and multi-Slave (Slave) system, and supports 11 nodes (10 Slave nodes) at most, the distance between the nodes is 15 meters at most, and the whole daisy chain is 40 meters at most. The A2B bus uses two wires to communicate between the host and the audio power amplifier, one wire is used for transmitting audio signals, and the other wire is used for synchronizing clocks, so that the whole audio signal transmission process is performed synchronously according to the clock signals, and the two-wire communication mode can effectively reduce noise interference in the signal transmission process and improve the accuracy of audio signal transmission. Meanwhile, the A2B bus is convenient to connect, and wiring work of a car audio system can be effectively reduced. Thus, the anti-interference performance of the audio power amplifier and the convenience of use of users can be improved.

When the output end of the power amplifier fails, for example, a load is open, a load is short-circuited, or a connecting line between the power amplifier and the load is short-circuited to ground, etc., the working effect of the audio power amplifier is reduced, and even electronic components in the audio power amplifier are damaged or burned. Therefore, it is important to detect the output of the power amplifier.

In an embodiment of the present invention, referring to fig. 4, the amplifying circuit 40 has a plurality of output terminals, and the output terminals of the amplifying circuit 40 are respectively used for being electrically connected to a plurality of speakers, and the audio power amplifier further includes:

the input end of the detection circuit 60 is correspondingly and electrically connected with a plurality of output ends of the amplifying circuit 40, and the output end of the detection circuit 60 is electrically connected with the main control circuit 10;

the detection circuit 60 is configured to detect output signals of the output ends of the amplifying circuits 40, and output a plurality of detection signals to the master control circuit 10;

the master control circuit 10 is further configured to output corresponding detection result signals according to a plurality of the detection signals.

In the present embodiment, the detection circuit 60 may be implemented using the voltage detection circuit 60, the current detection circuit 60, the resistance detection circuit 60, or the like, or the main controller described in the above embodiment.

Specifically, the number of output terminals of the amplifying circuit 40 may be plural, corresponding to plural output channels of the audio power amplifier. In the present embodiment, the number of output terminals of the amplifying circuit 40 is four, which correspond to the four output channels OUT-CH1, OUT-CH12, OUT-CH3 and OUT-CH4 of the audio power amplifier according to the invention, respectively. When the detection circuit 60 receives the external trigger signal, the output signals of the multiple output ends of the amplifying circuit 40 are detected respectively and multiple detection signals are correspondingly output to the main control circuit 10, so that the main control circuit 10 outputs corresponding detection result signals according to the detection signals and outputs the detection result signals to the external terminal through the communication circuit 50, and thus, a user can check the working condition of the current audio power amplifier through the external terminal. The external trigger signal may be a signal output by the user through the external terminal, or may be a trigger signal output by the user by triggering a trigger device of the host or a trigger device of the audio power amplifier itself. In this way, as long as the user outputs the corresponding trigger signal to the detection circuit 60 before or just before the audio power amplifier starts playing the audio signal, the detection circuit 60 can detect the output signal at the output end of the amplifying circuit 40 during the whole audio signal playing process. The detection circuit 60 may detect voltage signals or resistance signals at a plurality of output ends of the amplifying circuit 40, and the specific type of the detection circuit 60 may employ the voltage detection circuit 60 or the resistance detection circuit 60 according to actual requirements.

It should be noted that, the detection circuit 60 may detect when the audio power amplifier plays audio, or may be individually enabled or disabled.

Through the arrangement, the plurality of output ends of the audio power amplifier can be detected, so that the audio power amplifier can work normally, and meanwhile, when one or more of the plurality of output ends fails, a user can discover and process the audio power amplifier through the external terminal in time, damage or burnout of electronic components in the audio power amplifier is avoided, and user experience is improved.

In addition, any one or more of the main control circuit 10, the amplifying circuit 40 and the detecting circuit 60 may be integrated in the same integrated chip to reduce the wiring area, and effectively reduce the design cost, volume and weight of the audio power amplifier.

Optionally, in an embodiment of the present invention, the detecting circuit 60 is further configured to detect output impedances of the output ends of the plurality of amplifying circuits 40, and output corresponding impedance detection signals to the master control circuit 10, so that the master control circuit 10 determines whether the output ends of the plurality of amplifying circuits 40 electrically connected to the plurality of speakers are in an open circuit state or a short circuit state according to the received plurality of impedance detection signals, and outputs corresponding first result signals.

Specifically, taking the case that the main control circuit 10 and the detection circuit 60 are integrated on the same integrated chip DSP, the DSP detects a short-circuit load and an open-circuit load fault of a plurality of output channels of the audio power amplifier during the audio playing process, and generates an always-present inaudible audio signal inside the DSP, which is called a pilot tone. The pilot tone may be mixed into the audio signal. After filtering and demodulation, the output impedance can be continuously detected. The short circuit load and open circuit load conditions are detected based on the output impedance compared to a short circuit load threshold and an open circuit load threshold. When the output impedance is lower than the short-circuit load threshold, the short-circuit load fault occurs in the output channel corresponding to the output impedance, and when the output impedance is higher than the open-circuit load threshold, the open-circuit load fault occurs in the output end corresponding to the output impedance. The open load threshold and the short load threshold may be set in advance by a developer or a user.

It can be understood that a RTLDG OL SL Fault Mem register is provided in the DSP, and when the main control circuit 10 determines that an open load fault occurs currently according to the detection signal output by the detection circuit 60, the open load fault is reported to the register; when the master control circuit 10 determines that a short-circuit load fault occurs currently according to the detection signal output by the detection circuit 60, the short-circuit load fault is reported to the register, and the events can be used as fault events or warning events and directly routed to one of the I/O pins of the device. In addition, the main control circuit 10 may also send the first result signal to an external terminal via the communication circuit 50, for example, to the user through the I2C bus, while the main control circuit 10 controls the channel in which the short-circuit load fault or the open-circuit load fault occurs to stop switching and enter the fault state. When a user finds a fault through an external terminal, he must first clear the fault before he can restart the channel and the real-time load diagnostics must be reprogrammed. Thus, the reliability of the audio power amplifier is improved.

Optionally, in another embodiment of the present invention, the detecting circuit 60 is further configured to detect output voltages of the output ends of the plurality of amplifying circuits 40, and output corresponding voltage detection signals to the master control circuit 10, so that the master control circuit 10 determines whether the output ends of the plurality of amplifying circuits 40 electrically connected to the plurality of speakers are in a ground short-circuit state or a power short-circuit state according to the received voltage detection signals, and outputs corresponding second result signals.

It should be noted that, the detection circuit 60 may detect the ground short and the power short during the audio playing process, in addition to detecting the ground short and the power short of the multiple output channels of the audio power amplifier before the audio signal is enabled.

In combination with the above embodiments, the detecting circuit 60 detects the output voltages of the output terminals of the plurality of amplifying circuits 40, and outputs a voltage detection signal to the main control circuit 10, and the main control circuit 10 determines whether the output terminals of the plurality of amplifying circuits 40 currently electrically connected to the plurality of speakers are in a short-circuit to ground or a short-circuit to power according to the voltage detection signal, and outputs a second result signal to an external terminal. When the detection circuit 60 detects that the output voltage of the output end of one of the amplifying circuits 40 is about 0V, the main control circuit 10 determines that the output channel corresponding to the output end has a short circuit to ground fault, and outputs the second result signal to the external terminal through the communication circuit 50, so that the user can timely find and process the short circuit to ground possibly through the connection line correspondingly connecting the output end and the speaker. When the detection circuit 60 detects that the output voltage of the output end of one of the amplifying circuits 40 is greater than the voltage threshold, the main control circuit 10 determines that the output channel corresponding to the output end has a power short-circuit fault, and outputs a second result signal to the external terminal. The voltage threshold is set in advance by a developer or a user, and may be a specific voltage value or a specific voltage range. Meanwhile, the voltage threshold needs to be smaller than the power supply voltage.

Specifically, taking the case that the main control circuit 10 and the detection circuit 60 are integrated in the same integrated chip DSP, the DSP will output a constant current or a constant voltage to each output channel of the audio power amplifier during the audio playing process, and detect the current sensed by each output channel output FET, and compare the FET with the ground short-circuit threshold configured by the user and the voltage threshold when the power is short-circuited. The ground short threshold may be set to 0V, and if the DSP detects that a power short or a ground short Fault occurs, the power short and ground short flags are sent to the RTLDG Fault Mem register. Similar to the SL and OL flags, this signal will also be routed directly to one of the I/O pins of the device as a fault event. In addition, the DSP may also send a second result signal to the external terminal via the communication circuit 50, for example, to the user via the I2C bus, while the DSP controls the channel in which the power short-circuit fault or the ground short-circuit fault occurs to stop switching and enter the fault state. When a user finds a fault through an external terminal, he must first clear the fault before he can restart the channel and the real-time load diagnostics must be reprogrammed. Therefore, the loudspeaker is prevented from being damaged when the loudspeaker breaks down, and meanwhile, the working reliability of the audio power amplifier is improved.

In order to increase the power of the audio power amplifier so as to enable the audio power amplifier to output high-quality audio signals, the loudspeaker is ensured to achieve more real, full and crisp effects when playing the audio signals.

In an embodiment of the present invention, referring to fig. 5, the amplifying circuits 40 are plural, and the input terminals of the amplifying circuits 40 are electrically connected to the audio processing circuit 20; the controlled ends of the amplifying circuits 40 are electrically connected with the main control circuit 10; the audio power amplifier further comprises:

an or circuit 70, wherein an input end of the or circuit 70 is electrically connected with a plurality of amplifying circuits 40, and an output end of the or circuit 70 is electrically connected with the master control circuit 10;

the main control circuit 10 is configured to output a corresponding control signal to the voltage conversion circuit 30 according to the signal output by the or circuit 70, so that the voltage conversion circuit 30 performs voltage conversion on the output voltage of the storage battery according to the control signal and then outputs a corresponding power supply voltage signal.

In this embodiment, the or circuit 70 may be implemented by a diode, a triode, a MOS transistor, an IGBT transistor, a thyristor, or the like.

Referring to fig. 5, taking a circuit formed by 2 amplifying circuits 40 and two or gates 70 as an example, the amplifying circuits 40 include amplifying circuits 401 and 402, the amplifying circuits 401 and 402 correspond to four output channels, each output channel is correspondingly and electrically connected to a speaker, and the audio power amplifier in this embodiment has eight output channels. The anode of the first diode is correspondingly electrically connected with the amplifying circuit 401, the cathode of the first diode is electrically connected with the main control circuit 10, the anode of the second diode is correspondingly electrically connected with the amplifying circuit 402, and the cathode of the second diode is electrically connected with the main control circuit 10.

Specifically, when one or more of the plurality of output terminals of the amplifying circuit 40 is in the non-operating state, the power supply voltage required by the amplifying circuit 40 is lower than the power supply voltage when the plurality of output terminals are simultaneously operated, the amplifying or gate 70 may receive the audio amplified signals output by the plurality of output terminals of the amplifying circuit 40 and output the audio amplified signals to the main control circuit 10, so that the main control circuit 10 outputs a corresponding control signal according to the signal output by the or gate 70, and the voltage conversion circuit 30 performs voltage conversion on the output voltage of the storage battery and outputs a corresponding power supply voltage signal to supply power to the power consumption module in the audio power amplifier. When the number of the amplifying circuits 40 is plural, when one or more of the amplifying circuits 40 is in the non-working state, the power of the audio power amplifier will be reduced, or the gate circuit 70 receives the audio amplifying signals of the amplifying circuits 40 and integrates them into the same signal to output to the main control circuit 10, so that the main control circuit 10 outputs the corresponding control signal according to the number of the amplifying circuits 40 in the working state, and the voltage converting circuit 30 outputs the corresponding supply voltage signal, so as to realize the dynamic adjustment of the supply voltage required by the audio power amplifier. Therefore, the voltage value for supplying power to the audio power amplifier can be prevented from being far greater than the actually required voltage value, and the power loss of the audio power amplifier is reduced to a certain extent. In addition, the use of a diode as the or circuit 70 can reduce the circuit design cost.

It can be understood that when the number of the amplifying circuits 40 is plural, the number of the main control circuits 10 may be increased, for example, each main control circuit 10DSP may be configured to be electrically connected to two amplifying circuits 40 correspondingly, so that each main control circuit 10 receives the audio amplifying signals of two amplifying circuits 40 correspondingly electrically connected at the same time, which can improve the efficiency of signal processing of the main control circuit 10, and further improve the working efficiency of the audio power amplifier of the present invention.

The invention provides a car audio system, which comprises the audio power amplifier in any embodiment, and further comprises:

an external terminal communicatively connected to the audio processing circuit 20;

the external terminal is configured to output the audio signal to the audio processing circuit 20, so that the audio processing circuit 20 performs signal processing on the received audio signal and then outputs an audio processing signal.

In this embodiment, the external terminal may be a device with an audio signal output function, such as a host, a mobile phone, a tablet, or a computer. The user can freely select an audio signal through the external terminal and send it to the audio processing circuit 20 of the audio power amplifier of the present invention, so that the speaker electrically connected to the audio power amplifier plays the audio signal. Thus, different requirements of users are met, and user experience is enhanced.

It should be noted that, because the car audio system of the present invention is based on the above-mentioned audio power amplifier, the embodiments of the car audio system of the present invention include all the technical solutions of all the embodiments of the above-mentioned audio power amplifier, and the achieved technical effects are identical, and are not described herein again.

The invention provides an automobile, which comprises the automobile sound system in any embodiment.

It should be noted that, because the vehicle of the present invention is based on the above-mentioned vehicle audio system, the embodiments of the vehicle of the present invention include all the technical solutions of all the embodiments of the above-mentioned vehicle audio system, and the achieved technical effects are identical, and are not described herein again.

The foregoing description is only of the optional embodiments of the present invention, and is not intended to limit the scope of the invention, and all equivalent mechanical changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.

Claims (10)

1. An audio power amplifier for use in a car audio system, the car audio system comprising a battery and a host, the audio power amplifier comprising:

a main control circuit;

the audio processing circuit is electrically connected with the main control circuit and is used for receiving an audio signal output by the host, performing signal processing on the audio signal and outputting a corresponding audio processing signal to the main control circuit;

the input end of the voltage conversion circuit is electrically connected with the storage battery, and the controlled end of the voltage conversion circuit is electrically connected with the main control circuit;

the main control circuit is used for receiving the audio processing signals and outputting corresponding control signals to the voltage conversion circuit;

the voltage conversion circuit is used for converting the output voltage of the storage battery into voltage according to the control signal and outputting a corresponding power supply voltage signal.

2. The audio power amplifier of claim 1, wherein the audio power amplifier further comprises:

the input end of the amplifying circuit is electrically connected with the audio processing circuit, and the controlled end of the amplifying circuit is electrically connected with the main control circuit;

the amplifying circuit is used for receiving the audio processing signals, amplifying the audio processing signals according to preset amplification factors under the control of the main control circuit, and outputting corresponding audio amplified signals.

3. The audio power amplifier of claim 1, wherein the audio power amplifier comprises:

a communication circuit having a communication terminal for establishing a communication connection with an external terminal, the communication circuit being electrically connected with an input terminal of the audio processing circuit;

the communication circuit is used for outputting the audio signal received by the communication circuit to the audio processing circuit.

4. The audio power amplifier of claim 2, wherein the amplifying circuit has a plurality of output terminals, the plurality of output terminals of the amplifying circuit being respectively for corresponding electrical connection with a plurality of speakers, the audio power amplifier further comprising:

the input end of the detection circuit is correspondingly and electrically connected with the plurality of output ends of the amplifying circuit, and the output end of the detection circuit is electrically connected with the main control circuit;

the detection circuit is used for detecting output signals of the output ends of the amplifying circuits and outputting a plurality of detection signals to the main control circuit;

the main control circuit is also used for outputting corresponding detection result signals according to the detection signals.

5. The audio power amplifier of claim 4, wherein the detection circuit is further configured to detect output impedances of the output terminals of the plurality of amplifying circuits, and output corresponding impedance detection signals to the master control circuit, so that the master control circuit determines whether the output terminals of the plurality of amplifying circuits electrically connected to the plurality of speakers are in an open state or a short state according to the received plurality of impedance detection signals, and outputs corresponding first result signals.

6. The audio power amplifier of claim 4, wherein the detecting circuit is further configured to detect output voltages of the output terminals of the amplifying circuits and output corresponding voltage detection signals to the master control circuit, so that the master control circuit determines whether the output terminals of the amplifying circuits electrically connected to the plurality of speakers are in a ground short circuit state or a power short circuit state according to the received voltage detection signals, and outputs corresponding second result signals.

7. The audio power amplifier of claims 1-6, wherein the number of amplifying circuits is plural, and wherein the input terminals of the amplifying circuits are electrically connected to the audio processing circuit; the controlled ends of the amplifying circuits are electrically connected with the main control circuit; the audio power amplifier further comprises:

the input end of the OR gate circuit is electrically connected with the amplifying circuits, and the output end of the OR gate circuit is electrically connected with the main control circuit;

the main control circuit is used for outputting corresponding control signals to the voltage conversion circuit according to signals output by the OR gate circuit, so that the voltage conversion circuit performs voltage conversion on the output voltage of the storage battery according to the control signals and then outputs corresponding power supply voltage signals.

8. The audio power amplifier of claims 1-6, wherein the master circuit is further configured to output the first result signal and the second result signal to an external terminal via a communication terminal of the communication circuit.

9. A car audio system comprising the audio power amplifier of any one of claims 1-8, further comprising:

an external terminal in communication with the audio processing circuit;

the external terminal is used for outputting the audio signal to the audio processing circuit so that the audio processing circuit outputs an audio processing signal after performing signal processing on the received audio signal.

10. An automobile comprising the automobile sound system of claim 9.