Vehicle-mounted audio system

Abstract

The invention provides a vehicle-mounted audio system, which comprises a power supply input unit used for inputting an input voltage of a vehicle-mounted power supply; the sound processing unit is used for processing an input sound signal; the operation control unit is electrically connected with the sound processing unit and the power supply input unit and is used for performing signal interaction with the sound processing unit; the boost protection unit is electrically connected with the power supply input unit, the boost protection unit and the operation control unit, and is used for boosting the input voltage and inputting the boosted voltage to the sound processing unit; the sound output unit is used for outputting the processed sound signal; wherein the boost protection unit is also used for sending a signal to the operation control unit when the current is abnormal, and the operation control unit controls the boost protection unit to switch to a non-boost state so as to recover the input voltage; according to the invention, the vehicle-mounted audio quality is improved through boosting, and the situation of damage caused by boosting short circuit is not easy to occur.

Description

Technical Field

[0001] The invention relates to the field of electricity, in particular to a boost protection circuit, and more particularly to a vehicle-mounted audio system. Background Art

[0002] As people now have higher and higher requirements for vehicle sound effects, the 12V battery of the vehicle can no longer meet the high voltage input requirements of the car amplifier, so many car amplifiers will perform voltage boosting, boosting the battery's 12V to 35V, and then supplying the 35V voltage to the sound processing chip. However, since the current voltage boost module uses MOS tubes as switches for energy storage charging and discharging, the most common failure mode of MOS tubes after long-term work is short circuit. Once the MOS short circuit fails inside the boost module, the voltage boost module will short-circuit to the ground, causing the battery to short-circuit to the ground. The consequences are mild, the amplifier fuse will blow, and the amplifier will not work. In severe cases, the amplifier short-circuit will cause a large current to flow through the substrate, causing the substrate to heat up and catch fire, causing a fire. Summary of the invention

[0003] The object of the present invention is to provide a vehicle audio system for solving the problems pointed out in the above background technology.

[0004] The present invention provides a vehicle audio system, comprising: a power input unit, used for inputting an input voltage of a vehicle power supply; a sound processing unit, used for processing an input sound signal; an operation control unit, electrically connected to the sound processing unit and the power input unit, and used for performing signal interaction with the sound processing unit; a boost protection unit, electrically connected to the power input unit, the boost protection unit and the operation control unit, respectively, and used for boosting an input voltage and inputting the boosted voltage after boosting to the sound processing unit; a sound output unit, electrically connected to an output end of the sound processing unit, and used for outputting a processed sound signal; wherein the boost protection unit is also used for sending a signal to the operation control unit when a current is abnormal, and the operation control unit controls the boost protection unit to switch to a non-boosted state to restore the input voltage.

[0005] In an implementation manner of the present invention, the boost protection unit includes a first switch module, a second switch module, a third switch module, a fourth switch module, an overcurrent detection module, a voltage detection module, and a boost module. The overcurrent detection module is used to detect the magnitude of the circuit current and send the detected current information to the operation control unit. The boost module is used to boost the input voltage. The voltage detection module is used to detect the magnitude of the voltage after the boost processing. The operation control unit performs power amplifier configuration on the sound processing unit according to the magnitude of the voltage detected by the voltage detection module. Among them, the common contact of the first switch module is electrically connected to the power input unit. The normally closed contact of the first switch module is electrically connected to the input end of the overcurrent detection module. The output end of the overcurrent detection module is electrically connected to the common contact of the second switch module. The normally closed contact of the second switch module is electrically connected to the input end of the boost module. The output end of the boost module is electrically connected to the common contact of the fourth switch module. The normally closed contact of the fourth switch module is electrically connected to the sound processing unit. The normally closed contact of the first switch module is also electrically connected to the common contact of the third switch module. The normally open contact of the third switch module is electrically connected to the sound processing unit. The normally closed contact of the fourth switch module is also electrically connected to the input end of the voltage detection module. The output end of the voltage detection module is electrically connected to the operation control unit. And the second switch module, the third switch module, and the fourth switch module are all electrically connected to the operation control unit. During normal operation, the first switch module, the second switch module, and the fourth switch module are in the normally closed state, and the third switch module is in the normally open state.

[0006] In an implementation manner of the present invention, the boost module internally has a MOS transistor. One end of the MOS transistor is grounded. When the MOS transistor in the boost module has a ground short circuit failure, the overcurrent detection module outputs a signal to the operation control unit, and the operation control unit controls the second switch module and the fourth switch module to switch to the off state.

[0007] In an implementation manner of the present invention, the operation control unit includes a display module, an operation module, and a controller module. The operation module and the display module are both electrically connected to the controller module. The display module is used to display circuit-related information. The operation module is used to input operation information according to the displayed circuit-related information. The controller module is used to control the second switch module, the third switch module, and the fourth switch module according to the operation information.

[0008] In an implementation of the present invention, after the overcurrent detection module detects that the current value exceeds the preset threshold, it sends a first signal to the controller module, and the controller module switches the second switch module and the fourth switch module to the off state. The controller module controls the display module to display reset-related information. After the user first inputs reset information through the operation module, the controller module performs a reset process on the second switch module and the fourth switch module. When the overcurrent detection module detects that the current value still exceeds the preset threshold, it sends a second signal to the controller module. The controller module switches the second switch module and the fourth switch module to the off state and switches the third switch module to the on state to isolate the boost module. The voltage detection module sends the detection result to the controller module, and the controller module reconfigures the power amplifier of the sound processing unit.

[0009] In an implementation of the present invention, the sound processing unit includes a sound decoding module, a sound processing module, and a power amplification module. The sound decoding module is used to decode the input sound signal to obtain a decoded signal. The sound decoding module is electrically connected to the sound processing module to send the decoded signal to the sound processing module. The sound processing module is used to process the decoded signal to obtain a processed signal. The output end of the sound processing module is electrically connected to the power amplification module, and the output end of the power amplification module is electrically connected to the sound output unit. The power amplification module is used to perform power amplification on the processed signal and output it to the sound output unit. Moreover, the sound decoding module, the sound processing module, and the power amplification module are all communicatively connected to the controller module to achieve information interaction.

[0010] In an implementation of the present invention, the power input unit includes an input overvoltage detection module. The input overvoltage detection module is electrically connected to the common contact of the first switch module, the controller module, and the controller module. The input overvoltage detection module is used to detect the input voltage and output it to the controller module.

[0011] In an implementation of the present invention, the power input unit further includes a fuse module electrically connected to the overvoltage detection module. The threshold current of the fuse module is greater than the preset threshold.

[0012] As described above, the in-vehicle audio system of the present invention has the following beneficial effects: The present invention boosts the voltage input by the power input unit through the boost protection unit, which is beneficial to improving the in-vehicle audio quality. Meanwhile, during use, after the internal boost module of the boost protection unit fails due to a short circuit, it can automatically switch to a non-boost state for circuit protection, ensuring the normal operation of the entire circuit and preventing the power supply inside the power amplifier from being damaged due to a short circuit, thus guaranteeing the safety of the entire in-vehicle audio system. Moreover, there is no need for two power systems, reducing the use of spare components. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The structure diagram of the in-vehicle audio system of the present invention is shown. EMBODIMENTS

[0014] The following uses specific examples to illustrate the embodiments of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0015] It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. The diagrams only show the components related to the present invention, rather than being drawn according to the actual number, shape, and size of the components during actual implementation. The actual type, quantity, and ratio of each component during implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0016] Refer to Figure 1 For the in-vehicle audio system described in the present invention, by setting a boost protection unit to boost the voltage input by the power input unit, it is beneficial to improving the in-vehicle audio quality. Meanwhile, during use, after the internal boost module of the boost protection unit fails due to a short circuit, it can automatically switch to a non-boost state for circuit protection, ensuring the normal operation of the entire circuit and preventing the power supply inside the power amplifier from being damaged due to a short circuit, thus guaranteeing the safety of the entire in-vehicle audio system.

[0017] As Figure 1 shown, in one embodiment, an in-vehicle audio system of the present invention includes: A power input unit 1 for inputting the input voltage of the in-vehicle power supply; A sound processing unit 2 for processing the input sound signal; An operation control unit 3 electrically connected to the sound processing unit 2 and the power input unit 1 for performing signal interaction with the sound processing unit 2; The boost protection unit 4 is electrically connected to the power input unit 1, the boost protection unit 4, and the operation control unit 3 respectively, and is used to boost the input voltage and input the boosted voltage into the sound processing unit 2; The sound output unit 5 is electrically connected to the output end of the sound processing unit 2 and is used to output the processed sound signal; Wherein, the boost protection unit 4 is further used to send a signal to the operation control unit when the current is abnormal, and the operation control unit controls the boost protection unit 4 to switch to a non-boost state to restore the input voltage.

[0018] In this embodiment, after the input voltage of the vehicle-mounted power supply is input into the power input unit 1, it is boosted by the boost protection unit 4 and sent to the sound processing unit 2. After the sound processing unit 2 processes the input sound signal, the voltage after boosting is input to the power amplifier to process the sound signal, and then the sound signal is output through the sound output unit 5, so as to obtain a higher-quality vehicle-mounted audio output. During the operation of the vehicle-mounted audio system, the boost protection unit 4 always boosts the input voltage and constantly detects whether there is an abnormal situation. When the current is abnormal, the boost protection unit 4 sends a corresponding signal to the operation control unit 3, and the operation control unit 3 isolates the boost protection unit 4 according to the corresponding signal, so as to isolate the boost protection unit 4 from the entire audio system and ensure that the circuit of the entire audio system continues to work normally without being affected.

[0019] In one embodiment, the boost protection unit 4 includes a first switch module 41, a second switch module 42, a third switch module 43, a fourth switch module 44, an overcurrent detection module 45, a voltage detection module 46, and a boost module 47. The overcurrent detection module 45 is used to detect the magnitude of the circuit current and send the detected current information to the operation control unit 3. The boost module 47 is used to boost the input voltage. The voltage detection module 46 is used to detect the magnitude of the voltage after the boost process. The operation control unit 3 configures the power amplifier for the sound processing unit 2 according to the magnitude of the voltage detected by the voltage detection module 46; Among them, the common contact of the first switch module 41 is electrically connected to the power input unit 1, the normally closed contact of the first switch module 41 is electrically connected to the input end of the overcurrent detection module 45, the output end of the overcurrent detection module 45 is electrically connected to the common contact of the second switch module 42, the normally closed contact of the second switch module 42 is electrically connected to the input end of the boost module 47, the output end of the boost module 47 is electrically connected to the common contact of the fourth switch module 44, the normally closed contact of the fourth switch module 44 is electrically connected to the sound processing unit 2, the normally closed contact of the first switch module 41 is also electrically connected to the common contact of the third switch module 43, the normally open contact of the third switch module 43 is electrically connected to the sound processing unit 2, the normally closed contact of the fourth switch module 44 is also electrically connected to the input end of the voltage detection module 46, the output end of the voltage detection module 46 is electrically connected to the operation control unit 3, and the second switch module 42, the third switch module 43 and the fourth switch module 44 are all electrically connected to the operation control unit 3; During normal operation, the first switch module 41, the second switch module 42 and the fourth switch 44 module are in the normally closed state, and the third switch module 43 is in the normally open state.

[0020] In this embodiment, when the boost protection unit 4 is operating normally, since the first switch module 41, the second switch module 42 and the fourth switch 44 module are in the normally closed state, and the third switch module 43 is in the normally open state, the input voltage of the voltage input unit 1 passes through the first switch module 41, and then the overcurrent detection module 45 detects whether the input voltage is abnormal. After confirming no abnormality, it is input to the boost module 47 through the second switch module 42. The voltage after boost processing is input to the sound processing unit 2. At the same time, the voltage detection module 46 detects the boosted voltage and sends the detection result to the operation processing unit 3. The operation processing unit 3 configures the power amplifier of the sound processing unit 2 according to the detected boosted voltage result to make the output effect of the sound processing unit 2 better.

[0021] In one embodiment, the boost module 47 internally has a MOS transistor, one end of the MOS transistor is grounded. When the MOS transistor in the boost module 47 is short-circuited to the ground and fails, the overcurrent detection module 45 outputs a signal to the operation control unit 3, and the operation control unit 3 controls the second switch module 42 and the fourth switch module 44 to switch to the off state.

[0022] Specifically, during the process of the boost module 47 boosting the input voltage, when an abnormality occurs inside the boost module 47 and causes the internal MOS transistor to short-circuit, at this time, the overcurrent detection module 45 detects that the current in the current circuit is abnormal and sends the detected result to the operation processing unit 3, so that the operation processing unit 3 can switch the second switch module 42 and the fourth switch module 44 to the off state to isolate the entire boost protection unit 4 from the circuit and prevent the circuit from being damaged due to the short circuit.

[0023] In an embodiment, the operation control unit 3 includes a display module 31, an operation module 32, and a controller module 33. The operation module 32 and the display module 31 are both electrically connected to the controller module 33. The display module 31 is used to display circuit-related information, the operation module 32 is used to input operation information according to the displayed circuit-related information, and the controller module 33 is used to control the second switch module 42, the third switch module 43, and the fourth switch module 44 according to the operation information.

[0024] In this embodiment, when the audio system is working normally, the display module 31 displays the detected circuit-related information in real time. When an abnormality exists, the display module 31 displays that an abnormality exists and prompts whether to reset. Then, the operator can operate the operation module 32 according to the prompted information to input operation information, so that the controller module 33 can adjust and control the second switch module 42, the third switch module 43, and the fourth switch module 44 according to the input operation information to ensure the normal operation of the entire circuit.

[0025] Exemplarily, the operation module 32 and the display module 31 are integrated on a touch display screen, which is convenient for touch operation to input corresponding operation information while displaying circuit-related information.

[0026] Further, after the over-current detection module 45 detects that the current value exceeds the preset threshold, it sends a first signal to the controller module 33, and the controller module 33 switches the second switch module 42 and the fourth switch module 44 to the off state. The controller module 33 controls the display module 31 to display reset-related information. After the user first inputs reset information through the operation module 32, the controller module 33 performs a reset process on the second switch module 42 and the fourth switch module 44. When the over-current detection module 45 detects that the current value still exceeds the preset threshold, it sends a second signal to the controller module 33. The controller module 33 switches the second switch module 42 and the fourth switch module 44 to the off state and switches the third switch module 43 to the on state to isolate the boost module 47. The voltage detection module 46 sends the detection result to the controller module 33, and the controller module 33 reconfigures the power amplifier of the sound processing unit 2.

[0027] In this embodiment, when the entire audio system is working properly, the first switch module 41, the second switch module 42, and the fourth switch module 44 are in the closed state, while the third switch module 43 is in the open state. The input voltage input through the vehicle battery passes through the first switch module 41, the over-current detection module 45, the second switch module 42, the boost module 47, and the fourth switch module 44 and then is input to the sound processing unit 2. At the same time, the voltage detection module 46 also transmits the magnitude of the boosted voltage to the controller module 33. The controller module 33 configures the power amplifier of the sound processing unit 2 according to the boosted voltage to ensure better sound processing effect of the sound processing unit 2.

[0028] During the process of the boost module 47 boosting the input voltage, when the MOS transistor inside it fails with a short circuit to the ground, the current passing through the normally closed contacts of the second switch module 42 and the fourth switch module 44 rises rapidly at this time, causing the overcurrent detection module 45 to act and output a signal to the controller module 33. The controller module 33 outputs a control signal to make the second switch module 42 and the fourth switch module 44 energized and act, switching from the normally closed state to the normally open state. At the same time, the controller module 33 controls the display module 33 to display the information "<Voltage anomaly, do you want to reset?>" Then, according to the prompt, the user inputs the corresponding reset information through the operation module 32, and the controller module 33 resets the second switch module 42 and the fourth switch module 44 to the normally closed state according to the reset information. At this time, if the short - circuit problem inside the boost module 47 still exists, the controller module 33 outputs a signal to make the second switch module 42 and the fourth switch module 44 switch to the normally open contacts, and controls the third switch module 43 to be energized and act and then switch from the normally open contacts to the normally closed contacts, thus isolating the entire boost module 47 from the entire system. And the input voltage of the vehicle battery is input to the power amplifier inside the sound processing unit 2 through the third switch module 43 to ensure the normal operation of the sound processing unit 2. During this process, the voltage detection module 46 will transmit the input voltage information to the controller module 33 in real - time, so that the controller module 33 can configure the power amplifier for the sound processing module 2 according to the magnitude of the input voltage, ensuring the stable operation of the entire system.

[0029] It should be noted that the first switch module 41, the second switch module 42, the third switch module 43, and the fourth switch module 44 in the solution of the present invention all adopt relays. However, the solution of the present invention is not limited thereto, and other controllable switches or switch circuits in the prior art can also be used. This solution does not make a special limitation on this, and will not be elaborated here.

[0030] In one embodiment, the sound processing unit 2 includes a sound decoding module 21, a sound processing module 22, and a power amplification module 23. The sound decoding module 21 is used to decode the input sound signal to obtain a decoded signal. The sound decoding module 21 is electrically connected to the sound processing module 22 to send the decoded signal to the sound processing module 22. The sound processing module 22 is used to process the decoded signal to obtain a processed signal. The output end of the sound processing module 22 is electrically connected to the power amplification module 23, and the output end of the power amplification module 23 is electrically connected to the sound output unit 5. The power amplification module 23 is used to perform power amplification on the processed signal and output it to the sound output unit 5. And the sound decoding module 21, the sound processing module 22, and the power amplification module 23 are all communicatively connected to the controller module 33 to achieve information interaction.

[0031] During normal operation, the system is powered by the vehicle's 12V battery, and the voice input signal is the vehicle's A2B system signal. The voice decoding module 21 decomposes the system signal from the vehicle into an audio signal, a control signal, and an address signal, and then converts the audio signal into the I2S communication mode and transmits it to the voice processing module 22, and transmits the control signal and the address signal to the controller module 33 via the I2C method. After being processed by the voice processing module 22, it is then transmitted to the power amplifier module 23. The power amplifier module 23 amplifies the signal and converts it into a signal that can be received by the speaker, and finally outputs the voice through the voice output unit 5.

[0032] Among them, the voice decoding module 21 communicates with the controller module 33 via I2C, and the audio signal is transmitted between the voice decoding module 21 and the voice processing module 22 via the I2S method. The controller module 33 configures the registers of the voice processing module 22 through the SPI communication interface, and the controller module detects the status of the voice processing module 22 and conducts information interaction through the UART communication interface.

[0033] In one embodiment, the power input unit 1 includes an input overvoltage detection module 11, and the input overvoltage detection module 11 is electrically connected to the common contact of the first switch module 41 and the controller module 33. The input overvoltage detection module 41 is used to detect the input voltage and output it to the controller module 33. When the input voltage of the automotive battery is abnormal (lower than 10V or exceeding 20V), the input overvoltage detection module 11 notifies the controller module 33, and the display interface of the display module 31 displays <Battery voltage abnormal>. At the same time, the input overvoltage detection module 11 outputs a signal to the controller module 33, and the controller module 33 makes the first switch module 41 energize and act to switch from the normally closed contact to the normally open contact, so that the entire system is in a power-off state to protect the system safety.

[0034] In one embodiment, the power input unit 1 further includes a fuse module 12 electrically connected to the overvoltage detection module 11, and the threshold current of the fuse module 12 is greater than the preset threshold.

[0035] By setting the fuse module 12, since the threshold current of the fuse module 12 is greater than the preset threshold of the overcurrent detection module 45, when a circuit break occurs, the overcurrent detection module 45 will act first and the fuse will not melt. After isolating the boost module 47 from the entire system, the fuse module 45 can still play a protective role and provide safety protection for the entire system.

[0036] The descriptions of the processes or structures corresponding to the above respective drawings each have their own focuses. For parts not detailed in a certain process or structure, reference can be made to the relevant descriptions of other processes or structures.

[0037] The above embodiments are only illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A vehicle-mounted audio system, characterized in that, it includes: a power input unit for inputting the input voltage of the vehicle-mounted power supply; a sound processing unit for processing the input sound signal; an operation control unit electrically connected to the sound processing unit and the power input unit for performing signal interaction with the sound processing unit; a boost protection unit electrically connected to the power input unit, the boost protection unit, and the operation control unit respectively, for boosting the input voltage and inputting the boosted voltage to the sound processing unit; a sound output unit electrically connected to the output end of the sound processing unit for outputting the processed sound signal; wherein, the boost protection unit is further configured to send a signal to the operation control unit when the current is abnormal, and the operation control unit controls the boost protection unit to switch to a non-boost state to restore the input voltage.

2. The vehicle-mounted audio system according to claim 1, characterized in that, the boost protection unit includes a first switch module, a second switch module, a third switch module, a fourth switch module, an overcurrent detection module, a voltage detection module, and a boost module. The overcurrent detection module is configured to detect the magnitude of the circuit current and send the detected current information to the operation control unit. The boost module is configured to perform boost processing on the input voltage. The voltage detection module is configured to detect the magnitude of the voltage after the boost processing. The operation control unit performs power amplifier configuration on the sound processing unit according to the magnitude of the voltage detected by the voltage detection module; wherein, the common contact of the first switch module is electrically connected to the power input unit, the normally closed contact of the first switch module is electrically connected to the input end of the overcurrent detection module, the output end of the overcurrent detection module is electrically connected to the common contact of the second switch module, the normally closed contact of the second switch module is electrically connected to the input end of the boost module, the output end of the boost module is electrically connected to the common contact of the fourth switch module, the normally closed contact of the fourth switch module is electrically connected to the sound processing unit, the normally closed contact of the first switch module is further electrically connected to the common contact of the third switch module, the normally open contact of the third switch module is electrically connected to the sound processing unit, the normally closed contact of the fourth switch module is further electrically connected to the input end of the voltage detection module, the output end of the voltage detection module is electrically connected to the operation control unit, and the second switch module, the third switch module, and the fourth switch module are all electrically connected to the operation control unit; during normal operation, the first switch module, the second switch module, and the fourth switch module are in a normally closed state, and the third switch module is in a normally open state.

3. The vehicle-mounted audio system according to claim 2, characterized in that, The boost module incorporates an MOS transistor, one end of which is grounded. When the MOS transistor inside the boost module is short-circuited to the ground and fails, the overcurrent detection module outputs a signal to the operation control unit, and the operation control unit controls the second switch module and the fourth switch module to switch to the off state.

4. The in-vehicle audio system according to claim 2, wherein, the operation control unit includes a display module, an operation module, and a controller module. The operation module and the display module are both electrically connected to the controller module. The display module is used to display circuit-related information, the operation module is used to input operation information according to the displayed circuit-related information, and the controller module is used to control the second switch module, the third switch module, and the fourth switch module according to the operation information.

5. The in-vehicle audio system according to claim 4, wherein, after the overcurrent detection module detects that the current value exceeds the preset threshold, it sends a first signal to the controller module, and the controller module switches the second switch module and the fourth switch module to the off state. The controller module controls the display module to display reset-related information. After the user first inputs reset information through the operation module, the controller module performs a reset process on the second switch module and the fourth switch module. When the overcurrent detection module detects that the current value still exceeds the preset threshold, it sends a second signal to the controller module. The controller module switches the second switch module and the fourth switch module to the off state and switches the third switch module to the on state to isolate the boost module. The voltage detection module sends the detection result to the controller module, and the controller module reconfigures the power amplifier of the sound processing unit.

6. The in-vehicle audio system according to claim 4, wherein, the sound processing unit includes a sound decoding module, a sound processing module, and a power amplification module. The sound decoding module is used to decode the input sound signal to obtain a decoded signal. The sound decoding module is electrically connected to the sound processing module to send the decoded signal to the sound processing module. The sound processing module is used to process the decoded signal to obtain a processed signal. The output end of the sound processing module is electrically connected to the power amplification module, and the output end of the power amplification module is electrically connected to the sound output unit. The power amplification module is used to perform power amplification on the processed signal and output it to the sound output unit. Moreover, the sound decoding module, the sound processing module, and the power amplification module are all communicatively connected to the controller module to achieve information interaction.

7. The in-vehicle audio system according to claim 5, wherein, the power input unit includes an input overvoltage detection module. The input overvoltage detection module is electrically connected to the common contact of the first switch module and the controller module. The input overvoltage detection module is used to detect the input voltage and output it to the controller module.

8. The in-vehicle audio system according to claim 7, characterized in that, the power input unit further includes a fuse module electrically connected to the overvoltage detection module, and a threshold current of the fuse module is greater than the preset threshold.

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