Power management circuit and vehicle-mounted power amplifier system

Abstract

The application provides a power management circuit and a vehicle-mounted power amplifier system. The power management circuit comprises a voltage conversion module and a control module. The voltage conversion module is used for converting the voltage of a vehicle-mounted power supply into a target voltage corresponding to a first control signal output by the control module, and outputting the target voltage to the vehicle-mounted power amplifier. The vehicle-mounted power amplifier corresponds to different first control signals in different working modes, and each first control signal corresponds to a target voltage. The application can meet the complex power supply requirements of the vehicle-mounted power amplifier in different working modes.

Description

Technical Field

[0001] This application relates to the field of power management technology, and in particular to a power management circuit and an in-vehicle power amplifier system. Background Technology

[0002] With the development of intelligent and entertainment-oriented automobiles, the importance of in-vehicle amplifiers is becoming increasingly prominent. An in-vehicle amplifier refers to the audio power amplifier in an in-vehicle audio-visual system.

[0003] Currently, the power management circuits of car amplifiers have relatively simple functions, mainly limited to simple voltage conversion. The voltage output from the power management circuit to the car amplifier is fixed, which cannot meet the complex power requirements of the car amplifier in different operating modes. Utility Model Content

[0004] This application provides a power management circuit and an in-vehicle power amplifier system to meet the complex power requirements of in-vehicle power amplifiers in different operating modes.

[0005] According to a first aspect of the embodiments of this application, a power management circuit is provided, including a voltage conversion module and a control module;

[0006] The voltage conversion module is used to respond to the first control signal output by the control module, convert the voltage of the vehicle power supply into a target voltage corresponding to the first control signal, and output the target voltage to the vehicle power amplifier;

[0007] The vehicle-mounted power amplifier has different first control signals in different working modes, and each first control signal corresponds to a target voltage.

[0008] Optionally, the voltage conversion module includes a drive circuit and a voltage conversion circuit;

[0009] The voltage conversion circuit is connected between the vehicle power supply and the vehicle power amplifier;

[0010] The driving circuit is configured to output a driving signal to the voltage conversion circuit in response to a first control signal output by the control module; wherein the driving signal is a pulse width modulation signal.

[0011] The voltage conversion circuit is used to convert the voltage of the vehicle power supply into a target voltage corresponding to the first control signal in response to the drive signal, and output the target voltage to the vehicle power amplifier.

[0012] Optionally, the voltage conversion circuit includes an inductor, a first controllable switch, and a second controllable switch; the vehicle power supply, the inductor, the first controllable switch, and the vehicle power amplifier are connected in sequence; the vehicle power supply, the inductor, the second controllable switch, and ground are connected in sequence.

[0013] The driving circuit is specifically configured to respond to a first control signal output by the control module, output a first driving signal to the first controllable switch, and output a second driving signal to the second controllable switch; wherein, the driving signal includes the first driving signal and the second driving signal;

[0014] The voltage conversion circuit is specifically used to control the first controllable switch to be turned on or off in response to the first drive signal, and to control the second controllable switch to be turned on or off in response to the second drive signal, to convert the voltage of the vehicle power supply into a target voltage corresponding to the first control signal, and to output the target voltage to the vehicle power amplifier.

[0015] Optionally, the first control signal is used to control the drive circuit to shut down when the vehicle power amplifier is in sleep mode;

[0016] The first controllable switch includes a switching transistor and a diode connected in parallel;

[0017] The voltage conversion circuit is further configured to control the vehicle power supply to power the vehicle amplifier through the inductor and the diode in the first controllable switch when the drive circuit is off; wherein, when the drive circuit is off, the switching transistor in the first controllable switch is in the off state, and the second controllable switch is in the off state.

[0018] Optionally, the driving circuit includes an error amplifier and a driving signal generation circuit;

[0019] The error amplifier is used to compare the reference voltage carried in the first control signal with the output voltage output to the vehicle power amplifier, and output a second control signal to the drive signal generation circuit.

[0020] The drive signal generation circuit is used to output a drive signal to the voltage conversion circuit in response to the second control signal.

[0021] Optionally, the power management circuit further includes a power distribution circuit;

[0022] The power distribution circuit includes a detection circuit and multiple third controllable switches; each of the third controllable switches is connected between the vehicle power supply and a load; the load includes the vehicle power amplifier.

[0023] The detection circuit is used to detect the operating parameters of each of the loads and output the operating parameters of each of the loads to the control module.

[0024] The control module is also used to output third drive signals to each of the third controllable switches based on the operating parameters of each of the loads, and control each of the third controllable switches to be turned on or off, so as to adjust the power of each of the loads.

[0025] Optionally, the power management circuit further includes an overcurrent protection circuit;

[0026] The overcurrent protection circuit is used to control the third controllable switch corresponding to the load to turn off when the current of the load is detected to be greater than the current threshold, and to send overcurrent fault information to the control module.

[0027] Optionally, the power management circuit further includes an over-temperature protection circuit;

[0028] The over-temperature protection circuit is used to adjust the duty cycle of at least one of the third drive signals to reduce the power of at least one of the loads when the temperature of the power management circuit is detected to be greater than a first temperature threshold and less than a second temperature threshold; and to control each of the third controllable switches to turn off when the temperature of the power management circuit is detected to be greater than or equal to the second temperature threshold, so that the vehicle power supply stops outputting power.

[0029] Optionally, the power management circuit further includes a power status monitoring circuit and an analog-to-digital converter;

[0030] The power status monitoring circuit is used to detect the operating parameters of the vehicle power supply and send the operating parameters of the vehicle power supply to the analog-to-digital converter.

[0031] The analog-to-digital converter is used to convert the operating parameters of the vehicle power supply into digital signals and send the digital signals to the control module.

[0032] According to a second aspect of the embodiments of this application, an in-vehicle power amplifier system is provided, including an in-vehicle power amplifier and a power management circuit as described in the first aspect.

[0033] The power management circuit is connected between the vehicle power supply and the vehicle amplifier.

[0034] In this application, the power management circuit includes a voltage conversion module and a control module. The voltage conversion module responds to the first control signal output by the control module, converts the voltage of the vehicle power supply into a target voltage corresponding to the first control signal, and outputs the target voltage to the vehicle power amplifier. The vehicle power amplifier corresponds to different first control signals in different operating modes, and each first control signal corresponds to a target voltage. That is, when the vehicle power amplifier is in different operating modes, the voltage conversion module responds to different first control signals, converts the voltage of the vehicle power supply into a target voltage corresponding to the first control signal. Since each first control signal corresponds to a target voltage, different first control signals correspond to different target voltages, and different target voltages are output to the vehicle power amplifier, the voltage output by the power management circuit to the vehicle power amplifier is different when the vehicle power amplifier is in different operating modes, which can meet the complex power requirements of the vehicle power amplifier in different operating modes. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the structure of a power management circuit provided in an embodiment of this application;

[0037] Figure 2 This is a schematic diagram of another power management circuit provided in the embodiments of this application;

[0038] Figure 3 This is a schematic diagram of another power management circuit provided in the embodiments of this application;

[0039] Figure 4 This is a schematic diagram of an exemplary voltage conversion circuit provided in the embodiments of this application;

[0040] Figure 5 This is a schematic diagram of another power management circuit provided in the embodiments of this application;

[0041] Figure 6 This is a schematic diagram of another power management circuit provided in the embodiments of this application;

[0042] Figure 7 This is a schematic diagram of another power management circuit provided in the embodiments of this application;

[0043] Figure 8This is a schematic diagram of another power management circuit provided in the embodiments of this application;

[0044] Figure 9 This is a schematic diagram of another power management circuit provided in the embodiments of this application;

[0045] Figure 10 This is a schematic diagram of another power management circuit provided in the embodiments of this application. Detailed Implementation

[0046] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0047] Exemplary power management circuit

[0048] Please see Figure 1 In one exemplary embodiment, a power management circuit is provided. For example... Figure 1 As shown, the power management circuit includes a voltage conversion module 100 and a control module 200.

[0049] The control terminal of the control module 200 is connected to the controlled terminal of the voltage conversion module 100.

[0050] The voltage conversion module 100 is used to convert the voltage of the vehicle power supply into a target voltage corresponding to the first control signal output by the control module 200 in response to the first control signal, and output the target voltage to the vehicle power amplifier.

[0051] The vehicle power amplifier has different first control signals in different working modes, and each first control signal corresponds to a target voltage.

[0052] In the exemplary embodiment, the control module 200 is used to output different first control signals to the voltage conversion module 100 when the vehicle power amplifier is in different operating modes. The control module 200's detection of the operating mode of the vehicle power amplifier and the generation of different first control signals in different operating modes are prior art and do not involve algorithm improvement.

[0053] In an exemplary embodiment, the control module 200 may include a DSP (Digital Signal Processor), an MCU (Microcontroller Unit), or both a DSP and an MCU, or other control modules. This application does not limit this to any particular type of control module.

[0054] In an exemplary embodiment, the operating modes of the vehicle power amplifier include a sleep mode, a first load operating mode, an i-th load operating mode, and an N-th load operating mode, where N is a positive integer, i is a positive integer, and i is less than or equal to N.

[0055] In the exemplary embodiment, the vehicle amplifier refers to the audio power amplifier in the vehicle audio-visual system.

[0056] In the exemplary embodiment, the control module 200 detects that the vehicle amplifier is in sleep mode. This could mean that the control module 200 detects that no audio source signal is input to the vehicle amplifier, or that the control module 200 detects that the volume of the audio source signal input to the vehicle amplifier is less than a preset lower volume limit, or other implementation methods. This application does not limit these methods. The process by which the control module 200 detects that the vehicle amplifier is in sleep mode is prior art and does not involve any algorithm improvement.

[0057] In the exemplary embodiment, the control module 200 detects that the vehicle amplifier is in one of the first load operating mode, the i-th load operating mode, and the N-th load operating mode. This can be achieved by the control module 200 detecting the volume level selected by the user, with each volume level corresponding to a load operating mode. Alternatively, it can be achieved by the control module 200 detecting the volume range of the audio source signal input to the vehicle amplifier, with each volume range corresponding to a load operating mode. Other implementation methods are also possible, and this application does not limit this. The process by which the control module 200 detects that the vehicle amplifier is in one of the first load operating mode, the i-th load operating mode, and the N-th load operating mode is prior art and does not involve any improvement to the algorithm.

[0058] In an exemplary embodiment, the voltage of the vehicle power supply is typically 12V or 24V.

[0059] In an exemplary embodiment, the first control signal can be an analog voltage. The control module 200 outputs different analog voltages to the voltage conversion module 100 when the vehicle power amplifier operates in different modes. The voltage conversion module 100 is connected between the vehicle power supply and the vehicle power amplifier. Based on the analog voltage output by the control module 200, the voltage conversion module 100 processes the analog voltage through hardware circuitry to convert the vehicle power supply voltage into a target voltage corresponding to the analog voltage, and then outputs the target voltage to the vehicle power amplifier. The analog voltage output by the control module 200 to the voltage conversion module 100 is different in different operating modes of the vehicle power amplifier, and each analog voltage corresponds to a target voltage. When the analog voltage output by the control module 200 to the voltage conversion module 100 is different, the target voltage is also different.

[0060] The operation of the voltage conversion module 100 in response to the first control signal output by the control module, converting the voltage of the vehicle power supply into a target voltage corresponding to the first control signal, and outputting the target voltage to the vehicle power amplifier is all implemented through hardware circuitry.

[0061] In existing technologies, the voltage output from the power management circuit of a car amplifier is fixed, which cannot meet the complex power requirements of the car amplifier under different operating modes. For example, when the car amplifier is in a high-load operating mode, the power management circuit cannot provide a higher voltage to the car amplifier, and thus cannot provide sufficient power, resulting in a decrease in the sound quality of the audio signal processed by the car amplifier and output to the speaker.

[0062] In this application, the power management circuit includes a voltage conversion module and a control module. The voltage conversion module responds to the first control signal output by the control module, converts the voltage of the vehicle power supply into a target voltage corresponding to the first control signal, and outputs the target voltage to the vehicle power amplifier. The vehicle power amplifier corresponds to different first control signals in different operating modes, and each first control signal corresponds to a target voltage. That is, when the vehicle power amplifier is in different operating modes, the voltage conversion module responds to different first control signals, converts the voltage of the vehicle power supply into a target voltage corresponding to the first control signal. Since each first control signal corresponds to a target voltage, different first control signals correspond to different target voltages, and different target voltages are output to the vehicle power amplifier, the voltage output by the power management circuit to the vehicle power amplifier is different when the vehicle power amplifier is in different operating modes, which can meet the complex power requirements of the vehicle power amplifier in different operating modes.

[0063] In some embodiments, such as Figure 2 As shown, the voltage conversion module 100 includes a drive circuit 110 and a voltage conversion circuit 120.

[0064] The voltage conversion circuit 120 is connected between the vehicle power supply and the vehicle amplifier. The control terminal of the control module 200 is connected to the input terminal of the drive circuit 110, and the output terminal of the drive circuit 110 is connected to the controlled terminal of the voltage conversion circuit 120.

[0065] The driving circuit 110 is used to respond to the first control signal output by the control module 200 and output a driving signal to the voltage conversion circuit 120; wherein the driving signal is a pulse width modulation signal.

[0066] The voltage conversion circuit 120 is used to convert the voltage of the vehicle power supply into a target voltage corresponding to the first control signal in response to the drive signal, and output the target voltage to the vehicle power amplifier.

[0067] In the exemplary embodiment, the first control signal can be an analog voltage. The control module 200 outputs different analog voltages to the drive circuit 110 when the vehicle power amplifier operates in different modes. The drive signal is a pulse width modulation (PWM) signal. The drive circuit 110, based on the analog voltage output by the control module 200, processes the signal through hardware circuitry and outputs the PWM signal to the voltage conversion circuit 120. The analog voltage output by the control module 200 to the drive circuit 110 is different in different operating modes of the vehicle power amplifier, and the corresponding PWM signals are also different. The voltage conversion circuit 120, based on the PWM signal output by the drive circuit 110, processes the signal through hardware circuitry to convert the vehicle power supply voltage into a target voltage corresponding to the first control signal and outputs the target voltage to the vehicle power amplifier. Different PWM signals result in different target voltages.

[0068] In an exemplary embodiment, the voltage conversion circuit 120 typically includes a controllable switch. A pulse width modulation signal output from the drive circuit 110 to the voltage conversion circuit 120 can control the controllable switch in the voltage conversion circuit 120 to be turned on or off, thereby converting the voltage of the vehicle power supply into a target voltage corresponding to the first control signal. The target voltage is different when the pulse width modulation signal output from the drive circuit 110 to the voltage conversion circuit 120 is different.

[0069] In the exemplary embodiment, each first control signal corresponds to a drive signal, and each drive signal corresponds to a target voltage. Different first control signals correspond to different drive signals, and different drive signals correspond to different target voltages.

[0070] In different operating modes of the vehicle power amplifier, the first control signal output by the control module 200 to the drive circuit 110 is different, and the drive signal output by the drive circuit 110 to the voltage conversion circuit 120 is also different, resulting in different target voltages. When the vehicle power amplifier is in different operating modes, the voltage output by the power management circuit to the vehicle power amplifier is different, which can meet the complex power requirements of the vehicle power amplifier in different operating modes.

[0071] In some embodiments, such as Figure 3 As shown, the voltage conversion circuit 120 includes an inductor 121, a first controllable switch 122, and a second controllable switch 123; the vehicle power supply, inductor 121, first controllable switch 122, and vehicle power amplifier are connected in sequence; the vehicle power supply, inductor 121, second controllable switch 123, and ground are connected in sequence.

[0072] The drive circuit 110 is specifically used to respond to the first control signal output by the control module 200, output a first drive signal to the first controllable switch 122, and output a second drive signal to the second controllable switch 123; wherein the drive signal includes the first drive signal and the second drive signal.

[0073] The voltage conversion circuit 120 is specifically used to control the first controllable switch 122 to be turned on or off in response to the first drive signal, and to control the second controllable switch 123 to be turned on or off in response to the second drive signal, to convert the voltage of the vehicle power supply into a target voltage corresponding to the first control signal, and to output the target voltage to the vehicle power amplifier.

[0074] In an exemplary embodiment, the first controllable switch 122 and the second controllable switch 123 may be MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors) or other types of controllable switches, such as IGBTs (Insulated-Gate Bipolar Transistors). This application does not limit the types of switches.

[0075] In the exemplary embodiment, when the second drive signal controls the second controllable switch 123 to turn on and the first drive signal controls the first controllable switch 122 to turn off, the vehicle power supply charges the inductor 121; when the second drive signal controls the second controllable switch 123 to turn off and the first drive signal controls the first controllable switch 122 to turn on, the inductor 121 discharges, and the vehicle power supply and the inductor 121 provide voltage to the vehicle power amplifier, realizing the boost function, that is, the target voltage output by the voltage conversion circuit 120 to the vehicle power amplifier is greater than the voltage of the vehicle power supply input to the voltage conversion circuit 120.

[0076] In the exemplary embodiment, each first control signal corresponds to a first drive signal, and each first control signal corresponds to a second drive signal. Different first control signals correspond to different first drive signals, and different first control signals correspond to different second drive signals. When the first drive signal and the second drive signal change, the target voltage also changes.

[0077] In different operating modes of the vehicle power amplifier, the first control signal output by the control module 200 to the drive circuit 110 is different, the first drive signal output by the drive circuit 110 to the first controllable switch 122 is different, and the second drive signal output by the drive circuit 110 to the second controllable switch 123 is different, thus the target voltage is also different. When the vehicle power amplifier is in different operating modes, the voltage output by the power management circuit to the vehicle power amplifier is different, which can meet the complex power requirements of the vehicle power amplifier in different operating modes.

[0078] In an exemplary embodiment, such as Figure 4 The diagram shown is a schematic representation of an exemplary voltage conversion circuit. Figure 4 For illustrative purposes only, voltage conversion circuits can also be other specific circuit structures. Figure 4 In the middle, V LOAD Used to connect to a car amplifier, providing the target output voltage to the car amplifier. V SUPPLY Used to connect to the vehicle power supply and input the voltage from the vehicle power supply into the voltage conversion circuit. Figure 4 In the middle, the first controllable switch 122 uses Q H Q indicates H It is an NMOS transistor, including a parallel-connected switching transistor and a diode, and the second controllable switch 123 uses Q. L Q indicates L It is an NMOS transistor, consisting of a switch and a diode connected in parallel. Figure 4 In the diagram, inductor 121 is represented by L. Figure 4 In the example, the voltage conversion circuit also includes resistors R1 and R2, capacitors C1 and C2. Figure 4 In the middle, resistor R1 is connected to V LOAD Between V and ground, capacitor C1 is connected to V LOAD Between and the ground, V LOAD Connect Q H The drain, Q H source connection Q L The drain, Q L The source of the capacitor is grounded, and capacitor C2 is connected to V. SUPPLY Between and the ground, V SUPPLY Resistor R2, Inductor L and Q L The drains of the circuit are connected in sequence, and the first output terminal of the driver circuit 110 is connected to Q. HThe gate of the drive circuit 110 is connected to the second output terminal of Q. L The gate.

[0079] In some embodiments, the first control signal is used to control the drive circuit 110 to shut down when the vehicle power amplifier is in sleep mode;

[0080] The first controllable switch 122 includes a switching transistor and a diode connected in parallel;

[0081] The voltage conversion circuit 120 is also used to control the vehicle power supply to power the vehicle amplifier through the inductor 121 and the diode in the first controllable switch 122 when the drive circuit 110 is off; wherein, when the drive circuit is off, the switching transistor in the first controllable switch 122 is in the off state and the second controllable switch 123 is in the off state.

[0082] In an exemplary embodiment, when the vehicle power amplifier is in sleep mode, the control drive circuit 110 is turned off. This can be achieved by the control module 200 outputting a first control signal to the enable pin of the drive circuit 110 to turn off the drive circuit 110.

[0083] For example, Figure 4 In the process, when the vehicle power amplifier is in sleep mode, the drive circuit 110 is turned off, and the first controllable switch 122 uses Q. H Q indicates H It is an NMOS transistor, including a parallel-connected switching transistor and a diode, and the second controllable switch 123 uses Q. L Q indicates L For NMOS transistors, including parallel switching transistors and diodes, the drive circuit 110 cannot be Q. H Providing the first drive signal also fails to provide Q. L Provide a second drive signal, Q H The switching transistor in Q is in the off state. L V is in the off state. LOAD Used to connect to a car amplifier, V SUPPLY Used to connect to vehicle power supply, V SUPPLY Through resistor R2, inductor L, and Q H The diode in the V LOAD This provides power to the vehicle's power amplifier.

[0084] When the drive circuit 110 is operating normally, the voltage conversion circuit 120 is a boost circuit. However, when the vehicle amplifier is in sleep mode, the drive circuit 110 is turned off, and the voltage conversion circuit 120 controls the vehicle power supply to power the amplifier through the inductor 121 and the diode in the first controllable switch 122. There is no boosting process. Therefore, the target voltage output by the voltage conversion circuit 120 to the vehicle amplifier in sleep mode is lower than the target voltage output by the voltage conversion circuit 120 to the vehicle amplifier in other operating modes, thus reducing the power consumption of the vehicle amplifier. Furthermore, since the drive circuit 110 is turned off in sleep mode, its power consumption is reduced, thereby reducing the power consumption of the power management circuit and achieving low power consumption for both the power management circuit and the vehicle amplifier in sleep mode.

[0085] In some embodiments, such as Figure 5 As shown, the driving circuit 110 includes an error amplifier 111 and a driving signal generation circuit 112.

[0086] The voltage conversion circuit 120 is connected between the vehicle power supply and the vehicle power amplifier. The control terminal of the control module 200 is connected to the first input terminal of the error amplifier 111, the output terminal of the voltage conversion circuit 120 is connected to the second input terminal of the error amplifier 111, the output terminal of the error amplifier 111 is connected to the input terminal of the drive signal generation circuit 112, and the output terminal of the drive signal generation circuit 112 is connected to the controlled terminal of the voltage conversion circuit 120.

[0087] Error amplifier 111 is used to compare the reference voltage carried in the first control signal with the output voltage output to the vehicle power amplifier, and output the second control signal to the drive signal generation circuit 112.

[0088] The drive signal generation circuit 112 is used to output a drive signal to the voltage conversion circuit 120 in response to the second control signal.

[0089] Error amplifier 111 compares the reference voltage carried in the first control signal with the output voltage of the vehicle power amplifier, and outputs a second control signal to drive signal generation circuit 112. It can adjust the second control signal according to the reference voltage carried in the first control signal. Drive signal generation circuit 112 responds to the second control signal and outputs a drive signal to voltage conversion circuit 120. Then, based on the adjusted second control signal, it adjusts the drive signal, thereby adjusting the output voltage of the vehicle power amplifier. Then, based on the reference voltage carried in the first control signal and the monitored output voltage of the vehicle power amplifier, it performs a new round of adjustment of the output voltage of the vehicle power amplifier, forming a negative feedback loop to ensure the stability of the output voltage of the vehicle power amplifier (e.g., stability within ±1%), so as to meet the power supply accuracy requirements of the vehicle power amplifier.

[0090] Furthermore, the first control signal output by the control module 200 to the drive circuit 110 is different in different operating modes of the vehicle power amplifier, and the reference voltage carried in the first control signal is different. Based on the reference voltage carried in the first control signal and the output voltage output to the vehicle power amplifier, the output voltage output to the vehicle power amplifier is adjusted, and the adjusted output voltage output to the vehicle power amplifier is also different. That is, the voltage output by the power management circuit to the vehicle power amplifier is different in different operating modes of the vehicle power amplifier, which can meet the complex power requirements of the vehicle power amplifier in different operating modes.

[0091] For example, when the car amplifier is in high-load operating mode, the voltage output from the power management circuit of the existing car amplifier is fixed. The power management circuit cannot provide a higher voltage to the car amplifier, and therefore cannot provide sufficient power, resulting in a decrease in the sound quality of the audio signal processed by the car amplifier and output to the speaker. In this application, when the car amplifier is in high-load operating mode, the reference voltage carried in the first control signal is adjusted, thereby adjusting the output voltage to the car amplifier, increasing the output voltage to the car amplifier, and maintaining the stability of the output voltage to the car amplifier. This provides a higher voltage to the car amplifier, provides sufficient power, and improves the sound quality of the audio signal processed by the car amplifier and output to the speaker.

[0092] In an exemplary embodiment, the operation of the drive signal generation circuit 112 responding to the second control signal and outputting a drive signal to the voltage conversion circuit 120 is implemented by hardware circuits. For example, by combining hardware circuits such as comparators, RS flip-flops, AND gates, OR gates, NOR gates, and inverters, the output drive signal can be realized based on the input second control signal. This is prior art and does not involve algorithm improvement.

[0093] In some embodiments, such as Figure 6 As shown, the power management circuit includes a voltage conversion module 100, a control module 200, and a power distribution circuit 300.

[0094] The control terminal of the control module 200 is connected to the controlled terminal of the voltage conversion module 100.

[0095] The voltage conversion module 100 is used to convert the voltage of the vehicle power supply into a target voltage corresponding to the first control signal output by the control module 200 in response to the first control signal, and output the target voltage to the vehicle power amplifier.

[0096] The vehicle power amplifier has different first control signals in different working modes, and each first control signal corresponds to a target voltage.

[0097] The power distribution circuit 300 includes a detection circuit 310 and multiple third controllable switches 320; each third controllable switch 320 is connected between the vehicle power supply and a load; the load includes the vehicle power amplifier. The output of the detection circuit 310 is connected to the input of the control module 200, and the output of the control module 200 is connected to the third controllable switch 320.

[0098] The detection circuit 310 is used to detect the operating parameters of each load and output the operating parameters of each load to the control module 200.

[0099] The control module 200 is also used to output third drive signals to third controllable switches 320 based on the operating parameters of each load, and control the third controllable switches 320 to turn on or off in order to adjust the power of each load.

[0100] In an exemplary embodiment, Figure 6 In this application, there are four loads: load 1, load 2, load 3 and load 4. There are also four third controllable switches 320. The number of loads and the number of third controllable switches 320 can be other numbers as needed, and this application does not limit them.

[0101] In the exemplary embodiment, the control module 200 generates each third drive signal based on the operating parameters of each load, which is the prior art and does not involve the improvement of the algorithm.

[0102] In the exemplary embodiment, the operating parameters of each load include, but are not limited to, the current of each load and the operating status of the vehicle power amplifier (including power, temperature, etc.).

[0103] In the exemplary embodiment, the third controllable switch 320 may be a MOSFET or other types of controllable switches, and this application does not limit it in this regard.

[0104] Each third controllable switch 320 is connected between the vehicle power supply and a load. Based on the operating parameters of each load, it can output third drive signals to each third controllable switch 320, controlling the third controllable switch 320 to turn on or off, thereby adjusting the power of each load and achieving independent control of different loads. This dynamically adjusts the power distribution of the vehicle power supply among different loads. For example, when the air conditioning, navigation, and audio systems are all turned on simultaneously, and the demand of the vehicle amplifier is high, priority is given to ensuring the power supply of the vehicle amplifier, while appropriately limiting the current of other non-critical equipment.

[0105] In some embodiments, such as Figure 7 As shown, the power management circuit also includes an overcurrent protection circuit 400;

[0106] The overcurrent protection circuit 400 is used to control the third controllable switch 320 corresponding to the load to turn off when the current of the load is detected to be greater than the current threshold, and to send overcurrent fault information to the control module 200.

[0107] By using high-precision current sensors to monitor the current of each load in real time, when the detected load current exceeds a current threshold (for example, the current threshold could be 120% of the load's normal operating current), the corresponding third controllable switch 320 is turned off to prevent the current from increasing further, thus protecting the vehicle power supply and each load from overcurrent damage. Simultaneously, the overcurrent fault information is fed back to the control module 200, which records the overcurrent fault information and notifies the driver or vehicle control system when appropriate.

[0108] In an exemplary embodiment, Figure 7 In this application, there are four loads: load 1, load 2, load 3 and load 4. There are also four third controllable switches 320. The number of loads and the number of third controllable switches 320 can be other numbers as needed, and this application does not limit them.

[0109] In an exemplary embodiment, the overcurrent protection circuit 400 can be implemented using purely hardware circuitry.

[0110] In some embodiments, such as Figure 8 As shown, the power management circuit also includes an over-temperature protection circuit 500;

[0111] The over-temperature protection circuit 500 is used to adjust the duty cycle of at least one third drive signal to reduce the power of at least one load when the temperature of the power management circuit is detected to be greater than a first temperature threshold and less than a second temperature threshold; and to control each third controllable switch 320 to turn off when the temperature of the power management circuit is detected to be greater than or equal to the second temperature threshold, so that the vehicle power supply stops outputting power.

[0112] Temperature sensors are installed at key locations within the power management circuit (such as power MOSFETs and transformers) to monitor the circuit's temperature in real time. When the detected temperature exceeds a first temperature threshold but falls below a second temperature threshold, the duty cycle of at least one third drive signal is adjusted to reduce the power of at least one load, thereby lowering the power output of the power management circuit and reducing its temperature. If a cooling fan is present, it can be activated. Alternatively, the temperature can be reduced by controlling the third controllable switch 320 corresponding to some unnecessary loads to shut them off. If the temperature continues to rise, when the detected temperature exceeds or equals the second temperature threshold, all third controllable switches 320 are turned off to completely cut off the vehicle power supply output, ensuring safety.

[0113] In an exemplary embodiment, Figure 8 In this application, there are four loads: load 1, load 2, load 3 and load 4. There are also four third controllable switches 320. The number of loads and the number of third controllable switches 320 can be other numbers as needed, and this application does not limit them.

[0114] In an exemplary embodiment, the over-temperature protection circuit 500 can be implemented using purely hardware circuitry.

[0115] In some embodiments, such as Figure 9 As shown, the power management circuit also includes a short-circuit protection circuit 600;

[0116] The short-circuit protection circuit 600 is used to control each of the third controllable switches 320 to turn off when a short circuit is detected at the output terminal of the vehicle power supply, so as to stop the vehicle power supply from outputting power.

[0117] The output terminal of the vehicle power supply is monitored in real time. When a short circuit is detected at the output terminal of the vehicle power supply, each third controllable switch 320 is controlled to turn off, so that the vehicle power supply stops outputting power. The rapid shutdown of each third controllable switch 320 achieves preliminary protection. Then, the fuse or circuit breaker is triggered through the hardware circuit to completely cut off the short circuit circuit and prevent the power management circuit and other connected devices from being damaged by excessive current generated by the short circuit.

[0118] In an exemplary embodiment, Figure 9 In this application, there are four loads: load 1, load 2, load 3 and load 4. There are also four third controllable switches 320. The number of loads and the number of third controllable switches 320 can be other numbers as needed, and this application does not limit them.

[0119] In an exemplary embodiment, the short-circuit protection circuit 600 can be implemented using purely hardware circuitry.

[0120] In some embodiments, such as Figure 10 As shown, the power management circuit includes a voltage conversion module 100, a control module 200, a power status monitoring circuit 700, and an analog-to-digital converter 800.

[0121] The control terminal of the control module 200 is connected to the controlled terminal of the voltage conversion module 100. The voltage conversion module 100 is connected between the vehicle power supply and the vehicle power amplifier. The power status monitoring circuit 700 is connected between the vehicle power supply and the analog-to-digital converter 800, and the analog-to-digital converter 800 is connected between the power status monitoring circuit 700 and the control module 200.

[0122] The voltage conversion module 100 is used to convert the voltage of the vehicle power supply into a target voltage corresponding to the first control signal output by the control module 200 in response to the first control signal, and output the target voltage to the vehicle power amplifier.

[0123] The vehicle power amplifier has different first control signals in different working modes, and each first control signal corresponds to a target voltage.

[0124] The power status monitoring circuit 700 is used to detect the operating parameters of the vehicle power supply and send the operating parameters of the vehicle power supply to the analog-to-digital converter 800.

[0125] The analog-to-digital converter 800 is used to convert the operating parameters of the vehicle power supply into digital signals and send the digital signals to the control module 200.

[0126] In an exemplary embodiment, the operating parameters of the vehicle power supply may include the input voltage, output voltage, output current, power, temperature, etc.

[0127] The power status monitoring circuit 700 sends the operating parameters of the vehicle power supply to the analog-to-digital converter 800. The analog-to-digital converter 800 converts the operating parameters of the vehicle power supply into digital signals and sends the digital signals to the control module 200. This allows the control module 200 to easily obtain the operating parameters of the vehicle power supply, process and analyze the operating parameters, and generate a power status report.

[0128] In some embodiments, the power management circuit may also include various communication interfaces, such as a CAN (Controller Area Network) bus interface. The control module 200 connects to the communication interface for communication with other electronic control systems of the vehicle (such as the engine control unit, body control unit, etc.). Through these communication interfaces, the power management circuit can send power status information to other systems, receive the vehicle's operating status and control commands, and achieve coordinated operation with the vehicle's electrical system.

[0129] Exemplary vehicle amplifier system

[0130] Accordingly, this application also provides an in-vehicle power amplifier system, including the power management circuit and in-vehicle power amplifier provided in any of the above embodiments of this application. The power management circuit is connected between the in-vehicle power supply and the in-vehicle power amplifier.

[0131] For technical details not described in detail in this embodiment, please refer to the specific content of the power management circuit provided in the above embodiments of this application, which will not be repeated here.

[0132] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0133] The modules and circuits in the various embodiments of this application can be merged, divided, and deleted according to actual needs.

[0134] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0135] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A power management circuit, characterized in that, Includes a voltage conversion module and a control module; The voltage conversion module is used to respond to the first control signal output by the control module, convert the voltage of the vehicle power supply into a target voltage corresponding to the first control signal, and output the target voltage to the vehicle power amplifier; The vehicle-mounted power amplifier has different first control signals in different working modes, and each first control signal corresponds to a target voltage.

2. The power management circuit according to claim 1, characterized in that, The voltage conversion module includes a drive circuit and a voltage conversion circuit; The voltage conversion circuit is connected between the vehicle power supply and the vehicle power amplifier; The driving circuit is configured to output a driving signal to the voltage conversion circuit in response to a first control signal output by the control module; wherein the driving signal is a pulse width modulation signal. The voltage conversion circuit is used to convert the voltage of the vehicle power supply into a target voltage corresponding to the first control signal in response to the drive signal, and output the target voltage to the vehicle power amplifier.

3. The power management circuit according to claim 2, characterized in that, The voltage conversion circuit includes an inductor, a first controllable switch, and a second controllable switch; the vehicle power supply, the inductor, the first controllable switch, and the vehicle power amplifier are connected in sequence; the vehicle power supply, the inductor, the second controllable switch, and ground are connected in sequence. The driving circuit is specifically configured to respond to a first control signal output by the control module, output a first driving signal to the first controllable switch, and output a second driving signal to the second controllable switch; wherein, the driving signal includes the first driving signal and the second driving signal; The voltage conversion circuit is specifically used to control the first controllable switch to be turned on or off in response to the first drive signal, and to control the second controllable switch to be turned on or off in response to the second drive signal, to convert the voltage of the vehicle power supply into a target voltage corresponding to the first control signal, and to output the target voltage to the vehicle power amplifier.

4. The power management circuit according to claim 3, characterized in that, The first control signal is used to control the drive circuit to shut down when the vehicle power amplifier is in sleep mode; The first controllable switch includes a switching transistor and a diode connected in parallel; The voltage conversion circuit is further configured to control the vehicle power supply to power the vehicle amplifier through the inductor and the diode in the first controllable switch when the drive circuit is off; wherein, when the drive circuit is off, the switching transistor in the first controllable switch is in the off state, and the second controllable switch is in the off state.

5. The power management circuit according to claim 2, characterized in that, The driving circuit includes an error amplifier and a driving signal generation circuit; The error amplifier is used to compare the reference voltage carried in the first control signal with the output voltage output to the vehicle power amplifier, and output a second control signal to the drive signal generation circuit. The drive signal generation circuit is used to output a drive signal to the voltage conversion circuit in response to the second control signal.

6. The power management circuit according to claim 1, characterized in that, The power management circuit also includes a power distribution circuit; The power distribution circuit includes a detection circuit and multiple third controllable switches; each of the third controllable switches is connected between the vehicle power supply and a load; the load includes the vehicle power amplifier. The detection circuit is used to detect the operating parameters of each of the loads and output the operating parameters of each of the loads to the control module. The control module is also used to output third drive signals to each of the third controllable switches based on the operating parameters of each of the loads, and control each of the third controllable switches to be turned on or off, so as to adjust the power of each of the loads.

7. The power management circuit according to claim 6, characterized in that, The power management circuit also includes an overcurrent protection circuit; The overcurrent protection circuit is used to control the third controllable switch corresponding to the load to turn off when the current of the load is detected to be greater than the current threshold, and to send overcurrent fault information to the control module.

8. The power management circuit according to claim 6, characterized in that, The power management circuit also includes an over-temperature protection circuit; The over-temperature protection circuit is used to adjust the duty cycle of at least one of the third drive signals to reduce the power of at least one of the loads when the temperature of the power management circuit is detected to be greater than a first temperature threshold and less than a second temperature threshold. When the temperature of the power management circuit is detected to be greater than or equal to the second temperature threshold, each of the third controllable switches is controlled to turn off, so that the vehicle power supply stops outputting power.

9. The power management circuit according to claim 1, characterized in that, The power management circuit also includes a power status monitoring circuit and an analog-to-digital converter; The power status monitoring circuit is used to detect the operating parameters of the vehicle power supply and send the operating parameters of the vehicle power supply to the analog-to-digital converter. The analog-to-digital converter is used to convert the operating parameters of the vehicle power supply into digital signals and send the digital signals to the control module.

10. A vehicle-mounted power amplifier system, characterized in that, Includes an in-vehicle power amplifier and a power management circuit as described in any one of claims 1 to 9; The power management circuit is connected between the vehicle power supply and the vehicle amplifier.

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