CN117528342B - Power amplifier device, audio system and vehicle - Google Patents
Power amplifier device, audio system and vehicle Download PDFInfo
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- CN117528342B CN117528342B CN202311611646.9A CN202311611646A CN117528342B CN 117528342 B CN117528342 B CN 117528342B CN 202311611646 A CN202311611646 A CN 202311611646A CN 117528342 B CN117528342 B CN 117528342B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
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Abstract
The invention provides a power amplifier device, an audio system and a vehicle; wherein, the power amplifier device includes: at least one first power amplifying module and at least one second power amplifying module; the first power amplification module and the second power amplification module can independently output four channels, and the input power supply of the first power amplification module is different from the input power supply of the second power amplification module; amplifying target audio through the first power amplifying module and the second power amplifying module respectively to realize simultaneous output of different sound bandwidths of multiple channels; according to the invention, through the at least one first power amplification module and the at least one second power amplification module, simultaneous output of multiple channels (at least eight channels) can be realized, and the first power amplification module and the second power amplification module correspond to different voltage inputs, so that different tone quality bandwidths are realized, and therefore, stereo sound can be more vivid and better in effect, and good sound experience is brought to passengers.
Description
Technical Field
The present invention relates to the field of electronics, and in particular, to an audio power amplifier, an audio system, and a vehicle.
Background
Along with the arrival of the intelligent automobile age, intelligent cockpit technology is rapidly developed, wherein the sound effect of the whole automobile is more and more emphasized, the requirements of people on the sound effect of the automobile are higher and higher, and the loudspeaker on 4 doors of the existing automobile cannot meet the pursuit of people on stereophonic sound.
Disclosure of Invention
The invention aims to provide a power amplifier device, an audio system and a vehicle, which are used for solving the problems pointed out in the background art.
In a first aspect, the present invention provides a power amplifier device, including: at least one first power amplifying module and at least one second power amplifying module; the first power amplification module and the second power amplification module can independently output four channels, and the input power supply of the first power amplification module is different from the input power supply of the second power amplification module; and amplifying the target audio frequency through the first power amplifying module and the second power amplifying module respectively, so as to realize simultaneous output of different sound bandwidths of multiple channels.
According to the invention, through at least one first power amplification module and at least one second power amplification module, simultaneous output of multiple channels (at least eight channels) can be realized, and the first power amplification module and the second power amplification module correspond to different voltage inputs, so that different tone quality bandwidths are realized, and stereo sound can be more vivid and better in effect, and good sound experience is brought to passengers.
In an implementation manner of the first aspect, the power amplification device further includes: at least two current limiting modules; the current limiting module is connected with the first power amplifying module or the second power amplifying module, and each first power amplifying module and each second power amplifying module are correspondingly connected with the current limiting module, so that an input power supply of the first power amplifying module is input to the first power amplifying module through one current limiting module, and an input power supply of the second power amplifying module is input to the second power amplifying module through the other current limiting module; and performing current limiting protection on the first power amplification module and the second power amplification module through the at least two current limiting modules.
In this implementation manner, current limiting protection is implemented through the current limiting module, so as to ensure that when a certain sound channel fails, a circuit where a power amplifying module corresponding to the sound channel is cut off, and/or when a certain power amplifying module (a first power amplifying module and/or a second power amplifying module) fails, a circuit where the power amplifying module is cut off, and other circuits can work normally without being affected (corresponding to the sound channel in other circuits to work normally without being affected).
In one implementation manner of the first aspect, the current limiting module includes: the device comprises an adjustable resistor, a voltage comparator, a built-in battery, a first resistor, a second resistor, a third resistor, a triode and a relay; wherein, the relay includes: a common contact, a normally closed contact and a normally open contact; the common contact is used for being connected with an input power supply of the first power amplification module or an input power supply of the second power amplification module; the normally-closed contact or the normally-open contact is connected with the first power amplification module, or the normally-closed contact or the normally-open contact is connected with the second power amplification module; one end of the relay coil is connected with the built-in battery, and the other end of the relay coil is connected with the collector electrode of the triode; the base electrode of the triode is connected with one end of the first resistor, and the emitting electrode of the triode is grounded; the other end of the first resistor is connected with the output end of the voltage comparator; the voltage comparator is connected with the built-in battery, the voltage comparator is powered by a single power supply, the positive input end of the voltage comparator is connected with one end of the second resistor, the positive input end of the voltage comparator is also connected with the first power amplification module or the second power amplification module, and the negative input end of the voltage comparator is respectively connected with one end of the adjustable resistor and one end of the third resistor; the other end of the adjustable resistor and the other end of the second resistor are grounded; the other end of the third resistor is connected with the built-in battery; and setting different limiting currents of the current limiting module is realized by adjusting the resistance value of the adjustable resistor.
In an implementation manner of the first aspect, the current limiting protection of the first power amplifying module and the second power amplifying module by the at least two current limiting modules includes: setting limiting current of a current limiting module corresponding to each first power amplifying module and each second power amplifying module according to the channel current requirement corresponding to each first power amplifying module and each second power amplifying module; when the target current of the first power amplification module and/or the second power amplification module exceeds the limit current of the current limiting module corresponding to the first power amplification module and/or the second power amplification module, cutting off a target line through the current limiting module corresponding to the first power amplification module and/or the second power amplification module; the target line is a line where the current limiting module corresponding to the first power amplifying module and/or the second power amplifying module is located.
In an implementation manner of the first aspect, the power amplification device further includes: a first power supply and a second power supply; the power supply voltage of the first power supply is different from the power supply voltage of the second power supply, wherein the first power supply is connected with the first power amplification module and is used for providing an input power supply for the first power amplification module; the second power supply is connected with the second power amplification module and is used for providing an input power supply for the second power amplification module.
In an implementation manner of the first aspect, the power amplification device further includes: a transformation module; the transformation module is respectively connected with the first power amplification module and the second power amplification module, and is also used for being connected with an external power supply; converting the power supply voltage of the external power supply into a first voltage and a second voltage respectively through the transformation module; the first voltage is used as a power supply voltage of an input power supply of the first power amplification module; the second voltage is used as a power supply voltage of an input power supply of the second power amplification module; the power supply voltage, the first voltage and the second voltage of the external power supply are different from each other.
In a second aspect, the present invention provides an audio system comprising: the power amplifier comprises an audio input module, at least two audio output modules and the power amplifier device; the audio input module is connected with the power amplification device and is used for sending target audio to the power amplification device; the audio output module is connected with a first power amplification module or a second power amplification module in the power amplification device, each first power amplification module and each second power amplification module are correspondingly connected with one audio output module, each audio output module is used for outputting target audio amplified by the first power amplification module or the second power amplification module, and each audio output module comprises four audio output units.
In one implementation manner of the second aspect, the audio input module includes: an audio decoding unit, an audio processing unit and a controller; the audio decoding unit is connected with the audio processing unit and is used for acquiring a sound source, decoding the sound source, acquiring decoding information and inputting the decoding information to the audio processing unit; the audio processing unit is respectively connected with the first power amplification module and the second power amplification module, and is used for processing the audio information, obtaining the target audio and sending the target audio to the first power amplification module and the second power amplification module; the controller is respectively connected with the audio decoding unit, the audio processing unit, the first power amplification module and the second power amplification module.
In a third aspect, the present invention provides a vehicle comprising: the audio system described above.
As described above, the power amplifier device, the audio system and the vehicle of the invention have the following beneficial effects:
Compared with the prior art, the power amplifier device provided by the invention can realize simultaneous output of different voice bandwidths of multiple channels, and solves the problem of single voice quality due to small power amplifier quantity in the existing audio equipment; meanwhile, different current limiting protection of different sound channels is realized through the current limiting module, and other channels are prevented from being influenced after a single channel is short-circuited.
Drawings
Fig. 1 is a schematic structural diagram of a power amplifier device according to an embodiment of the invention.
Fig. 2 is a circuit diagram of a current limiting module according to an embodiment of the invention.
Fig. 3 is a schematic structural diagram of a power amplifier device according to another embodiment of the invention.
Fig. 4 is a schematic structural diagram of an audio system according to an embodiment of the invention.
Description of the embodiments
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the illustrations, not according to the number, shape and size of the components in actual implementation, and the form, number and proportion of each component in actual implementation may be arbitrarily changed, and the layout of the components may be more complex.
At present, the existing vehicle has at most 4 loudspeakers (respectively positioned on 4 doors) for playing audio at the same time, and along with the increasing requirements of people on the sound effect of the vehicle, the 4 loudspeakers cannot meet the pursuit of people on stereophonic sound.
See fig. 1-4. Compared with the prior art, the power amplification device provided by the invention can realize simultaneous output of different sound bandwidths of multiple channels, and solves the problems of single sound quality due to small number of power amplifiers in the existing audio equipment; meanwhile, different current limiting protection of different sound channels is realized through the current limiting module, and other channels are prevented from being influenced after a single channel is short-circuited.
As shown in fig. 1, in an embodiment, the power amplifier device provided by the present invention includes: at least one first power amplifying module 101 and at least one second power amplifying module 102.
Specifically, each of the first power amplification module 101 and the second power amplification module 102 can output four channels independently, and an input power supply of the first power amplification module 101 is different from an input power supply of the second power amplification module 102; and the target audio is amplified by the first power amplification module 101 and the second power amplification module 102 respectively, so that simultaneous output of different sound bandwidths of multiple channels is realized.
As shown in fig. 1, in an embodiment, the power amplifier device provided by the present invention includes: three first power amplifying modules 101 and three second power amplifying modules 102.
It should be noted that, in this embodiment, the power amplifier device provided by the invention can support 24 channels to output independently at most, and different input power supplies make the sound output bandwidths different, and the 24 channels cooperate with each other, so that the stereo effect is excellent.
As shown in fig. 1, in an embodiment, the power amplifier device further includes: at least two current limiting modules 103.
Specifically, one current limiting module 103 is connected to one of the first power amplifying module 101 or one of the second power amplifying modules 102, and each of the first power amplifying module 101 and each of the second power amplifying modules 102 is correspondingly connected to one of the current limiting modules 103, so that an input power of the first power amplifying module 101 is input to the first power amplifying module 101 through one of the current limiting modules 103, and an input power of the second power amplifying module 102 is input to the second power amplifying module 102 through the other of the current limiting modules 103; the first power amplifying module 101 and the second power amplifying module 102 are subjected to current limiting protection through the at least two current limiting modules 103.
As shown in fig. 1, in an embodiment, the power amplifier device provided by the present invention includes: six current limiting modules 103.
Specifically, the six current limiting modules 103 are respectively connected to the three first power amplifying modules 101 and the three second power amplifying modules 102 in fig. 1.
It should be noted that, a current limiting module 103 is disposed before each power amplifying module (including the first power amplifying module 101 and the second power amplifying module 102), each current limiting module 103 can set different limiting currents separately, and the maximum practical current of each power amplifying module is evaluated according to different channel current requirements corresponding to different power amplifying modules; after the maximum current of each current limiting module 103 is set, if a short circuit abnormality occurs in a certain sound channel in a plurality of sound channels under the actual use condition, the current of the power amplifying module corresponding to the sound channel exceeds the maximum current of the set current limiting module 103, so that the current limiting module 103 of the sound channel acts to cut off the connection of the sound channel, thus the safety of a power supply system (comprising the input power supply of the first power amplifying module 101 and the input power supply of the second power amplifying module 102) can be well protected, and the whole power supply system is not paralyzed due to the abnormality of a certain sound channel or a certain power amplifying module, so that the whole system cannot work normally.
As shown in fig. 2, in one embodiment, the current limiting module 103 includes: the adjustable resistor RZ1, the voltage comparator OP1, the built-in battery, the first resistor R1, the second resistor R2, the third resistor R3, the triode Q1 and the relay K1.
Specifically, the relay K1 includes: common contact ①, normally closed contact ②, and normally open contact ③; the common contact ① is used for accessing the input power supply of the first power amplification module 101 or the input power supply of the second power amplification module 102; the normally-closed contact ② or the normally-open contact ③ is connected to the first power amplification module 101, or the normally-closed contact ② or the normally-open contact ③ is connected to the second power amplification module 102; one end of the coil of the relay K1 is connected with the built-in battery, and the other end of the coil of the relay K1 is connected with the collector electrode of the triode Q1; the base electrode of the triode Q1 is connected with one end of the first resistor R1, and the emitter electrode of the triode Q1 is grounded; the other end of the first resistor R1 is connected with the output end of the voltage comparator OP 1; the voltage comparator OP1 is connected with the built-in battery, the voltage comparator OP1 is powered by a single power supply, a positive input end of the voltage comparator OP1 is connected with one end of the second resistor R2, a positive input end of the voltage comparator OP1 is also connected with the first power amplification module 101 or the second power amplification module 102, and a negative input end of the voltage comparator OP1 is respectively connected with one end of the adjustable resistor RZ1 and one end of the third resistor R3; the other end of the adjustable resistor RZ1 and the other end of the second resistor R2 are grounded; the other end of the third resistor R3 is connected with the built-in battery; by adjusting the resistance value of the adjustable resistor RZ1, the current limiting module 103 is set to different limiting currents.
In one embodiment, as shown in fig. 2, the built-in battery is 5V.
In one embodiment, as shown in fig. 2, the transistor Q1 is an NPN transistor.
It should be noted that the operation principle of the current limiting module 103 is as follows:
As shown in fig. 2, by adjusting the resistance of the adjustable resistor RZ1, the negative input terminal of the voltage comparator OP1 can obtain an adjustable reference voltage from 0V to 5V; specifically, limiting current regulation is exemplified by: if the adjustable resistor rz1=100deg.OMEGA is adjusted, when the negative input voltage of the voltage comparator OP 1=rz1x5/(rz1+r3) =100deg.5/(100+100) =2.5V, when the positive input voltage of the voltage comparator OP1 is less than 2.5V, the voltage comparator OP1 outputs a low level 0V, the three-stage transistor Q1 is not operated, the relay K1 is not operated, the common contact ① and the normally closed contact ② of the relay are conducted, the current limiting module 103 is not operated, when the positive input voltage of the voltage comparator OP1 is greater than 2.5V, the voltage comparator OP1 outputs a high level 5V, the three-stage transistor Q1 is conducted, the relay K1 is powered on, the common contact ① and the normally open contact ③ of the relay are conducted, the current limiting module 103 is operated, the input power source of the first power amplifying module 101 or the input power source of the second power amplifying module 102 is disconnected from the load (the first power amplifying module 101 or the second power module 102), and when the positive input voltage of the voltage comparator OP1 is greater than 2.5 V=2.5V, the input voltage of the voltage comparator OP1 is 2.5=2.5; when rz1=200 ohms is adjusted, the OP1 negative-input voltage=rz1×5/(rz1+r3) =200×5/300=3.3V, limiting current=3.3V/r2=2.5/0.1=33a; by adjusting the different resistance values of the adjustable resistor RZ1, different current limit settings can be achieved.
In one embodiment, the current limiting protection of the first power amplifying module 101 and the second power amplifying module 102 by the at least two current limiting modules 103 includes: setting limiting current of the current limiting module 103 corresponding to each first power amplifying module 101 and each second power amplifying module 102 according to the channel current requirement corresponding to each first power amplifying module 101 and each second power amplifying module 102; when the target current of the first power amplification module 101 and/or the second power amplification module 102 exceeds the limit current of the current limiting module 103 corresponding to the first power amplification module 101 and/or the second power amplification module 102, cutting off a target line through the current limiting module 103 corresponding to the first power amplification module 101 and/or the second power amplification module 102; the target line is a line where the current limiting module 103 corresponding to the first power amplifying module 101 and/or the second power amplifying module 102 is located.
As shown in fig. 3, in an embodiment, the power amplifier device further includes: a first power supply 104 and a second power supply 105.
Specifically, the power supply voltage of the first power supply 104 is different from the power supply voltage of the second power supply 105, where the first power supply 104 is connected to the first power amplification module 101, and the first power supply 104 is configured to provide an input power to the first power amplification module 101; the second power supply 105 is connected to the second power amplifying module 102, and the second power supply 105 is configured to provide an input power to the second power amplifying module 102.
In one embodiment, the power voltage of the first power source 104 is 25V; the power supply voltage of the second power supply 105 is 35V.
As shown in fig. 1, in an embodiment, the power amplifier device further includes: a transformation module 106.
Specifically, the transforming module 106 is connected to the first power amplifying module 101 and the second power amplifying module 102, and the transforming module 106 is further configured to be connected to an external power supply 201; converting the power voltage of the external power supply 201 into a first voltage and a second voltage through the transformation module 106; wherein the first voltage is used as a power supply voltage of the input power of the first power amplification module 101; the second voltage is used as a power supply voltage of the input power of the second power amplification module 102; the power supply voltage, the first voltage and the second voltage of the external power supply are different from each other.
In an embodiment, the voltage transformation module 106 may be a voltage boosting module, or may be a voltage reducing module, or it may be that the voltage transformation module 106 includes both a voltage boosting module and a voltage reducing module, and in particular, the voltage values of the power supply voltage and the first voltage and the second voltage of the external power supply 201 are considered in an actual application scenario.
As shown in fig. 1, in one embodiment, the first voltage is 25V; the second voltage is 35V.
In one embodiment, the external power source 201 is a vehicle battery.
In one embodiment, the power supply voltage of the vehicle battery is 12V.
Specifically, in the present embodiment, the voltage transformation module 106 is a voltage boosting module, by which the power supply voltage of 12V is boosted to 25V and 35V to be supplied to the first power amplification module 101 and the second power amplification module 102, respectively.
The power amplifier device of the present invention is further explained by specific embodiments.
As shown in fig. 1, in an embodiment, the power amplifier device provided by the invention is applied to a vehicle audio system.
Specifically, the vehicle-mounted audio system comprises the power amplifier device; the power amplification device comprises three first power amplification modules 101, three second power amplification modules 102, six current limiting modules 103 and a transformation module 106, wherein each first power amplification module 101 and each second power amplification module 102 can independently output 4 channels, so that the vehicle-mounted audio system can support 24 channels to be independently output at most.
In the present embodiment, the voltage transformation module 106 adopts a dual-path voltage boosting module.
The voltage transformation module 106 is connected with a 12V vehicle battery and is used for boosting the 12V voltage into 25V and 35V, wherein the 25V voltage is respectively input to the three first power amplification modules 101 through the three current limiting modules 103; the voltage of 35V is respectively input to the three second power amplification modules 102 through the other three current limiting modules 103, and different power supply voltages enable the sound output bandwidths of the different power amplification modules to be different, 24 channels are matched, and the stereo effect is excellent.
In this embodiment, the sound source of the car audio system is an A2B (Automotive Audio Bus, i.e. car audio bus) sound source; specifically, the in-vehicle audio system further includes: an A2B sound decoding module 202, a sound processing module 203, an MCU controller 204 and 24 horns 205.
Wherein, each 4 of the 24 horns 205 is a group, and each group is correspondingly connected with the first power amplification module 101 or the second power amplification module 102; the A2B sound decoding module 202 is configured to access the A2B sound signal, and after performing decoding processing on the A2B sound signal, input the decoded sound signal to the sound processing module 203; after processing the decoded and processed sound signal, the sound processing module 203 inputs the processed sound signal to the first power amplifying module 101 and the second power amplifying module 102; after the processed sound signals are amplified by the first power amplifying module 101 and the second power amplifying module 102, 24 loudspeakers 205 output sound; the MCU controller 204 is connected to the A2B sound decoding module 202, the sound processing module 203, the first power amplifying module 101, and the second power amplifying module 102, respectively.
It should be noted that, the MCU controller 204 configures the register configuration of the sound processing module 203 through the SPI communication interface, detects the state of the sound processing module 203 through the UART communication interface, and exchanges the mutual state information, and the MCU controller 204 configures the working addresses of the A2B sound decoding module 202, the first power amplifying module 101 and the second power amplifying module 102 through the I2C communication mode, and the register state.
It should be noted that, the decoding process of the audio signal by the A2B audio decoding module 202 and the processing of the audio signal by the audio processing module 203 are all conventional technical means in the art, and will not be described in detail herein.
In one embodiment, the A2B sound decoding module 202 employs an AD242BWCCSZ chip.
In one embodiment, the sound processing module 203 employs an ADSP21565 chip.
In one embodiment, MCU controller 204 employs an STM32F103 chip.
It should be noted that, the vehicle-mounted audio system of the embodiment realizes the simultaneous output of 24 channels of the vehicle-mounted power amplifier, and different voltage inputs are sampled by different power amplification modules, so that stereo sound is better realized; meanwhile, through the design of the current limiting module, different current limiting of different channels of the vehicle-mounted power amplifier is realized, and through independent protection of each channel, the mutual influence after the short circuit of the channels is reduced, and the whole system is not paralyzed due to the abnormality of one channel or one power amplifying module.
As shown in fig. 4, in an embodiment, the present invention further provides an audio system, which includes: an audio input module 41, at least two audio output modules 42 and the above-mentioned power amplifier 43.
Specifically, the audio input module 41 is connected to the power amplifier 43, and the audio input module 41 is configured to send target audio to the power amplifier 43; one of the audio output modules 42 is connected to a first power amplification module or a second power amplification module in the power amplification device 43, and each of the first power amplification module and each of the second power amplification modules is correspondingly connected to one of the audio output modules 42, and each of the audio output modules 42 is configured to output the target audio amplified by the first power amplification module or the second power amplification module, and each of the audio output modules 42 includes four audio output units.
In one embodiment, the audio input module 41 comprises: an audio decoding unit 411 (corresponding to the "A2B sound decoding module 202" in the above-described car audio system), an audio processing unit 412 (corresponding to the "sound processing module 203" in the above-described car audio system), and a controller 413 (corresponding to the "MCU controller 204" in the above-described car audio system).
Specifically, the audio decoding unit 411 is connected to the audio processing unit 412, where the audio decoding unit 411 is configured to obtain a sound source, perform decoding processing on the sound source, obtain decoding information, and input the decoding information to the audio processing unit 412; the audio processing unit 412 is connected to the first power amplifying module and the second power amplifying module, and the audio processing unit 412 is configured to process the audio information, obtain the target audio, and send the target audio to the first power amplifying module and the second power amplifying module; the controller 413 is connected to the audio decoding unit 411, the audio processing unit 412, and the first power amplifying module and the second power amplifying module, respectively.
In an embodiment, the audio output unit is a speaker.
It should be noted that the audio system may be applied to, but is not limited to, a vehicle; when applied to a vehicle, corresponds to the in-vehicle audio system described in the above embodiment.
It should be noted that, the working principle of the audio system is the same as that of the above-mentioned vehicle audio system, so detailed description thereof is omitted here.
In one embodiment, the present invention also provides a vehicle comprising: the audio system described above.
It should be noted that, the working principle of the audio system of the present invention applied to the vehicle is the same as that of the above-mentioned audio system, so detailed description thereof is omitted.
The descriptions of the processes or structures corresponding to the drawings have emphasis, and the descriptions of other processes or structures may be referred to for the parts of a certain process or structure that are not described in detail.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (7)
1. A power amplifier device, characterized in that the power amplifier device comprises: at least one first power amplifying module and at least one second power amplifying module; each first power amplification module and each second power amplification module are arranged in parallel, the first power amplification module and the second power amplification module can output four channels independently, and the input power supply of the first power amplification module is different from the input power supply of the second power amplification module; amplifying target audio through the first power amplifying module and the second power amplifying module respectively to realize simultaneous output of different sound bandwidths of multiple channels;
The power amplifier device further comprises: at least two current limiting modules; the current limiting module is connected with the first power amplifying module or the second power amplifying module, and each first power amplifying module and each second power amplifying module are correspondingly connected with the current limiting module, so that an input power supply of the first power amplifying module is input to the first power amplifying module through one current limiting module, and an input power supply of the second power amplifying module is input to the second power amplifying module through the other current limiting module; the first power amplifying module and the second power amplifying module are subjected to current limiting protection through the at least two current limiting modules; the current limiting protection of the first power amplifying module and the second power amplifying module by the at least two current limiting modules includes: setting limiting current of a current limiting module corresponding to each first power amplifying module and each second power amplifying module according to the channel current requirement corresponding to each first power amplifying module and each second power amplifying module; when the target current of the first power amplification module and/or the second power amplification module exceeds the limit current of the current limiting module corresponding to the first power amplification module and/or the second power amplification module, cutting off a target line through the current limiting module corresponding to the first power amplification module and/or the second power amplification module; the target line is a line where the current limiting module corresponding to the first power amplifying module and/or the second power amplifying module is located.
2. The power amplifier device of claim 1, wherein the current limiting module comprises: the device comprises an adjustable resistor, a voltage comparator, a built-in battery, a first resistor, a second resistor, a third resistor, a triode and a relay; wherein, the relay includes: a common contact, a normally closed contact and a normally open contact; the common contact is used for being connected with an input power supply of the first power amplification module or an input power supply of the second power amplification module; the normally-closed contact or the normally-open contact is connected with the first power amplification module, or the normally-closed contact or the normally-open contact is connected with the second power amplification module; one end of the relay coil is connected with the built-in battery, and the other end of the relay coil is connected with the collector electrode of the triode; the base electrode of the triode is connected with one end of the first resistor, and the emitting electrode of the triode is grounded; the other end of the first resistor is connected with the output end of the voltage comparator; the voltage comparator is connected with the built-in battery, the voltage comparator is powered by a single power supply, the positive input end of the voltage comparator is connected with one end of the second resistor, the positive input end of the voltage comparator is also connected with the first power amplification module or the second power amplification module, and the negative input end of the voltage comparator is respectively connected with one end of the adjustable resistor and one end of the third resistor; the other end of the adjustable resistor and the other end of the second resistor are grounded; the other end of the third resistor is connected with the built-in battery; and setting different limiting currents of the current limiting module is realized by adjusting the resistance value of the adjustable resistor.
3. The power amplifying device according to any one of claims 1 to 2, further comprising: a first power supply and a second power supply; the power supply voltage of the first power supply is different from the power supply voltage of the second power supply, wherein the first power supply is connected with the first power amplification module and is used for providing an input power supply for the first power amplification module; the second power supply is connected with the second power amplification module and is used for providing an input power supply for the second power amplification module.
4. The power amplifying device according to any one of claims 1 to 2, further comprising: a transformation module; the transformation module is respectively connected with the first power amplification module and the second power amplification module, and is also used for being connected with an external power supply; converting the power supply voltage of the external power supply into a first voltage and a second voltage respectively through the transformation module; the first voltage is used as a power supply voltage of an input power supply of the first power amplification module; the second voltage is used as a power supply voltage of an input power supply of the second power amplification module; the power supply voltage, the first voltage and the second voltage of the external power supply are different from each other.
5. An audio system, the audio system comprising: an audio input module, at least two audio output modules, and a power amplifier device according to any one of claims 1 to 4; the audio input module is connected with the power amplification device and is used for sending target audio to the power amplification device; the audio output module is connected with a first power amplification module or a second power amplification module in the power amplification device, each first power amplification module and each second power amplification module are correspondingly connected with one audio output module, each audio output module is used for outputting target audio amplified by the first power amplification module or the second power amplification module, and each audio output module comprises four audio output units.
6. The audio system of claim 5, wherein the audio input module comprises: an audio decoding unit, an audio processing unit and a controller; the audio decoding unit is connected with the audio processing unit and is used for acquiring a sound source, decoding the sound source, acquiring decoding information and inputting the decoding information to the audio processing unit; the audio processing unit is respectively connected with the first power amplification module and the second power amplification module, and is used for processing the audio information, obtaining the target audio and sending the target audio to the first power amplification module and the second power amplification module; the controller is respectively connected with the audio decoding unit, the audio processing unit, the first power amplification module and the second power amplification module.
7. A vehicle, characterized in that the vehicle comprises: an audio system as claimed in claim 5 or 6.
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