Power-off anti-explosion sound circuit and power amplifier device

Abstract

This application relates to a power-down noise prevention circuit and a power amplifier device. The circuit includes a power-down detection module and a volume control module. The output of the power-down detection module is connected to the controlled terminal of the volume control module, and the control terminal of the volume control module is connected to the shutdown control pin of the power amplifier chip in the power amplifier device. The power-down detection module generates a power-down detection signal based on the detected power supply voltage state to control the control state of the volume control module. The volume control module generates a volume control signal based on the control state to control the operating state of the power amplifier chip. When the power supply voltage state detected by the power-down detection module is a power-down state, the volume control module sets its control state to a mute state to synchronously adjust the operating state of the power amplifier chip to a shutdown state, thereby preventing the power amplifier device from generating popping noise when the power is lost. This circuit achieves power-down noise prevention with simple circuit design and control logic, and provides excellent mute control.

Description

Technical Field

[0001] This application relates to the field of circuit control technology, and in particular to a power failure anti-explosion circuit and a power amplifier device. Background Technology

[0002] In the field of circuit control technology, there is a need for noise prevention during power-down processes to avoid popping noises caused by sudden drops in power supply voltage in power amplifiers. However, related noise prevention circuits suffer from drawbacks such as strong dependence on circuit structure, high requirements for component matching, and insufficient controllability of control logic response. They are also susceptible to external power fluctuations or temperature changes, which can reduce system stability and increase debugging and maintenance costs. Summary of the Invention

[0003] Based on this, it is necessary to provide a power-down noise prevention circuit and power amplifier device to address the above-mentioned technical problems, so as to achieve power-down noise prevention treatment with simple circuit design and control logic, few components, low overall cost, and good noise control effect.

[0004] In a first aspect, this application provides a power-down noise prevention circuit for power amplifier equipment. The circuit includes a power-down detection module and a volume control module. The output terminal of the power-down detection module is connected to the controlled terminal of the volume control module, and the control terminal of the volume control module is connected to the shutdown control pin of the power amplifier chip of the power amplifier equipment. The power-down detection module generates a power-down detection signal based on the detected power supply voltage state and controls the control state of the volume control module based on the power-down detection signal. The volume control module generates a volume control signal based on the control state and controls the operating state of the power amplifier chip based on the volume control signal. When the power supply voltage state detected by the power-down detection module is a power-down state, the control state of the volume control module is a mute control state to synchronously adjust the operating state of the power amplifier chip to a shutdown state, so as to avoid the power amplifier equipment from generating popping noise when the power supply is down.

[0005] Secondly, this application also provides a power amplifier device, which includes a power amplifier chip and a power-down anti-explosive circuit; the power-down anti-explosive circuit includes a power-down detection module and a volume control module; the output terminal of the power-down detection module is connected to the controlled terminal of the volume control module, and the control terminal of the volume control module is connected to the shutdown control pin of the power amplifier chip.

[0006] The aforementioned power failure anti-pop-out circuit and amplifier equipment firstly utilize a power failure detection module to monitor the power supply voltage status in real time, enabling rapid output of a power failure detection signal at the initial stage of a power failure, thus accurately identifying the power failure state. Secondly, the volume control module controls the power amplifier chip's shutdown pin, ensuring the chip enters a shutdown state before power failure, effectively preventing abnormal audio signal output and pop-out phenomena caused by unstable power supply. Furthermore, the overall circuit structure is simple and requires few components, facilitating integration into existing power amplifier equipment and offering advantages such as low cost, high reliability, and ease of deployment. Based on this, it can significantly improve the audio stability and user experience of the power amplifier equipment during power failure, achieving power failure anti-pop-out processing with simple circuit design and control logic, few components, low overall cost, and good noise control effect. Attached Figure Description

[0007] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0008] Figure 1 This is a structural block diagram of a power amplifier device in one embodiment; Figure 2 This is a schematic diagram illustrating the time-voltage relationship between the power supply voltage to the power amplifier chip and the voltage at the power amplifier chip's turn-off control pin in one embodiment. Figure 3 This is a schematic diagram of the circuit structure of the power failure anti-explosion noise circuit in one embodiment. Detailed Implementation

[0009] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0010] In one exemplary embodiment, such as Figure 1 As shown, a power failure anti-explosion circuit is provided for use in power amplifier equipment; the power failure anti-explosion circuit includes a power failure detection module 100 and a volume control module 200.

[0011] The output of the power failure detection module 100 is connected to the controlled end of the volume control module 200, and the control end of the volume control module 200 is connected to the shutdown control pin of the power amplifier chip 300 of the power amplifier device.

[0012] The power failure detection module 100 is used to generate a power failure detection signal based on the detected power supply voltage state and control the control state of the volume control module 200 based on the power failure detection signal. The volume control module 200 is used to generate a volume control signal based on its own control state and control the working state of the power amplifier chip 300 based on the volume control signal.

[0013] For example, when the power supply voltage state detected by the power failure detection module 100 is a power failure state, the control state of the volume control module 200 is a mute control state to synchronously adjust the working state of the power amplifier chip 300 to a shut-off state, so as to avoid the power amplifier device from producing popping noise when the power is lost.

[0014] For example, such as Figure 2 As shown, in the time-voltage relationship between the power supply voltage AMP_Vcc supplied to the power amplifier chip 300 and the voltage of the power amplifier chip 300 at the shutdown control pin SD_PIN (ShutDown PIN) detected by the oscilloscope, if the power failure detection module 100 detects that the power supply voltage AMP_Vcc supplied to the power amplifier chip 300 has lost power at time t1, it drives the volume control module 200 to switch to the mute control state, so as to control the voltage of the shutdown control pin SD_PIN of the power amplifier chip 300 to synchronously decrease to a low level at time t1, so that the power amplifier chip 300 switches to the off state at time t1, thereby effectively preventing the power amplifier device 300 from generating popping noise when the power is lost.

[0015] In one exemplary embodiment, such as Figure 3 As shown, the power failure detection module includes a power supply unit Vin1, an auxiliary power supply unit Vin2, a first resistor R1, a second resistor R2, a fourth resistor R4, a fifth resistor R5, a capacitor C1, and a reset IC unit U1. The volume control module includes an N-type MOSFET Q1, a SoC unit U2, a third resistor R3, and a sixth resistor R6.

[0016] For example, in the power failure detection module: the output terminal of the power supply unit Vin1 is connected to the input terminal of the first resistor R1, the output terminal of the first resistor R1 is connected to the input terminal of the second resistor R2 and the working voltage pin Vcc_Pin of the reset IC unit U1, the output terminal of the second resistor R2 is grounded, and the two ends of the capacitor C1 are connected to the output terminals of the first resistor R1 and the second resistor R2, respectively; the ground pin GND_Pin of the reset IC unit U1 is grounded, the reset pin Reset_Pin of the reset IC unit U1 is connected to the output terminal of the fourth resistor R4 and the input terminal of the fifth resistor R5, the output terminal of the auxiliary power supply unit Vin2 is connected to the input terminal of the fourth resistor R4, and the output terminal of the fifth resistor R5 is connected to the gate of the N-type MOS transistor Q1.

[0017] The power supply unit Vin1 and auxiliary power supply unit Vin2 supply power voltage for the normal operation of the power failure and anti-explosive noise circuit. The power supply voltage state of power supply unit Vin1 matches the power supply voltage state of the power amplifier, meaning the power supply voltage state of the power amplifier can synchronously influence and be reflected in the power supply voltage state of power supply unit Vin1. The first resistor R1 and the second resistor R2 convert the power supply voltage state of power supply unit Vin1 into the output voltage of the first resistor R1 through a voltage divider relationship, and apply this voltage to the working voltage pin Vcc_Pin of the reset IC unit U1. The reset IC unit U1 generates a power failure detection signal on the reset pin Reset_Pin based on the output voltage of the first resistor R1, and applies it to the gate of the N-type MOSFET Q1 through the fifth resistor R5. The fourth resistor R4 and the fifth resistor R5 provide voltage and current limiting protection for the gate of the N-type MOSFET Q1, and the capacitor C1 filters out high-frequency noise and stabilizes the voltage divider.

[0018] For example, in the volume control module: the source of the N-type MOSFET Q1 is connected to the output of the SoC unit U2, the drain of the N-type MOSFET Q1 is connected to the input of the third resistor R3 and the input of the sixth resistor R6 respectively, the output of the third resistor R3 is grounded, and the output of the sixth resistor R6 is connected to the shutdown control pin of the power amplifier chip 300.

[0019] Among them, the N-type MOSFET Q1 is used to adjust its own working state according to the received power-down detection signal to control the connection state between the SoC unit U2 and the power amplifier chip 300. The SoC unit U2 is used as a signal generation source for volume control signals and for outputting audio to the power amplifier chip 300. The third resistor R3 is used to provide a pull-down voltage for the drain of the N-type MOSFET Q1, and the sixth resistor R6 is used to provide voltage and current limiting protection for the power amplifier chip 300.

[0020] For example, Figure 3 As shown, when the power supply voltage of the power amplifier is in a non-power-down state, the power supply voltage of the power supply unit Vin1 is synchronously in a non-power-down state. The output voltage of the first resistor R1 is greater than the operating voltage of the reset IC unit U1, so that the power-down detection signal generated by the reset IC unit U1 at the reset pin Reset_Pin is a high-level control signal. Then, the N-type MOSFET Q1 is turned on after receiving the power-down detection signal, which represents a high-level control signal. The connection between the SoC unit U2 and the power amplifier chip 300 is turned on. The high-level control signal (i.e., the MUTE signal) output by the SoC unit U2 is used as a volume control signal and sent to the power amplifier chip 300 through the N-type MOSFET Q1 to raise the voltage of the power amplifier chip 300 at the off control pin SD_PIN, so that the power amplifier chip 300 is in the on state and outputs sound normally.

[0021] For example, when the power supply voltage of the power amplifier device is just in a power-down state, the power supply voltage of the power supply unit Vin1 is synchronously in a power-down state. The output voltage of the first resistor R1 is less than the operating voltage of the reset IC unit U1, so that the power-down detection signal generated by the reset IC unit U1 at the reset pin Reset_Pin is a low-level control signal. Then, the N-type MOSFET Q1 is turned off after receiving the power-down detection signal, which represents a low-level control signal. The connection between the SoC unit U2 and the power amplifier chip 300 is blocked. The pull-down voltage provided by the third resistor R3 to the drain of the N-type MOSFET Q1 serves as a volume control signal to pull down the voltage of the power amplifier chip 300 at the turn-off control pin SD_PIN, so that the power amplifier chip 300 is in a turned-off state and there is no sound output.

[0022] Optionally, the normal output voltage of power supply unit Vin1 is 12V, the normal output voltage of auxiliary power supply unit Vin2 is 3.3V, the working voltage of reset IC unit U1 on working voltage pin Vcc_Pin is 2.93V, the resistance of the first resistor R1 is 10KΩ, the resistance of the second resistor R2 is 3.3KΩ, the resistance of the third resistor R3 is 4.7KΩ, the resistance of the fourth resistor R4 is 4.7KΩ, the resistance of the fifth resistor is 4.7KΩ, the resistance of the sixth resistor is 4.7KΩ, and the capacitance of capacitor C1 is 100nF.

[0023] When the AC power supply voltage of the power amplifier is in a non-power-down state, the normal output voltage of the power supply unit Vin1 is 12V. Through the voltage division effect of the first resistor R1 and the second resistor R2, the voltage of the working voltage pin Vcc_Pin of the reset IC unit U1 is 2.97V. Since this 2.97V is greater than the working voltage of the working voltage pin Vcc_Pin (2.93V), the voltage of the reset IC unit U1 at the reset pin Reset_Pin is equal to the voltage of the working voltage pin Vcc_Pin (2.97V). That is, the power-down detection signal generated at the reset pin Reset_Pin is a high-level control signal.

[0024] When the AC power supply voltage of the power amplifier device is just in a power-down state, the power supply voltage of the power supply unit Vin1 is synchronously in a power-down state, that is, the output voltage of the power supply unit Vin1 is less than 12V. Then, through the voltage division effect of the first resistor R1 and the second resistor R2, the voltage of the working voltage pin Vcc_Pin of the reset IC unit U1 is less than the working voltage of the working voltage pin Vcc_Pin, which is 2.93V. This makes the voltage of the reset IC unit U1 at the reset pin Reset_Pin zero, that is, the power-down detection signal generated at the reset pin Reset_Pin is a low-level control signal.

[0025] In one exemplary embodiment, a power amplifier device is provided, which may be represented as Figure 1 The power amplifier device shown includes a power amplifier chip and a power-down anti-pop circuit as described in any of the above embodiments.

[0026] The aforementioned power failure and explosion-proof circuit, as well as the various modules in the power amplifier device, can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of the computer device in hardware form or independent of it, or stored in the memory of the computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0027] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments described above. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0028] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0029] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A power failure anti-explosion noise circuit, characterized in that, The circuit, which is used in power amplifier equipment, includes a power failure detection module and a volume control module. The output terminal of the power failure detection module is connected to the controlled terminal of the volume control module, and the control terminal of the volume control module is connected to the shutdown control pin of the power amplifier chip of the power amplifier device. The power failure detection module is used to generate a power failure detection signal based on the detected power supply voltage state and control the control state of the volume control module based on the power failure detection signal. The volume control module is used to generate a volume control signal based on the control state and control the working state of the power amplifier chip based on the volume control signal. When the power supply voltage detected by the power failure detection module is in a power failure state, the volume control module is in a mute control state to synchronously adjust the working state of the power amplifier chip to a shutdown state, so as to avoid the power amplifier device from producing popping noise when the power is lost.

2. The circuit of claim 1, wherein, The power failure detection module includes a power supply unit, a first resistor, a second resistor, and a reset IC unit; The output terminal of the power supply unit is connected to the input terminal of the first resistor. The output terminal of the first resistor is connected to the input terminal of the second resistor and the working voltage pin of the reset IC unit. The output terminal of the second resistor is grounded. The output terminal of the reset IC unit is connected to the controlled terminal of the volume control module. The power supply voltage state of the power supply unit is matched with the power supply voltage state of the power amplifier device. The first resistor and the second resistor are used to convert the power supply voltage state of the power supply unit into the output voltage of the first resistor through the voltage division relationship and apply it to the reset IC unit. The reset IC unit is used to generate a power failure detection signal based on the output voltage of the first resistor and apply it to the volume control module.

3. The circuit of claim 2, wherein, When the power supply voltage of the power supply unit is in a non-power-down state, the output voltage of the first resistor is greater than the operating voltage of the reset IC unit, so that the power-down detection signal generated by the reset IC unit is a high-level control signal.

4. The circuit of claim 2, wherein, When the power supply voltage of the power supply unit is in a power-down state, the output voltage of the first resistor is less than the operating voltage of the reset IC unit, so that the power-down detection signal generated by the reset IC unit is a low-level control signal.

5. The circuit according to claim 1, characterized in that, The volume control module includes an N-type MOSFET, a SoC unit, and a third resistor; The gate of the N-type MOS transistor is connected to the power-down detection module, the source of the N-type MOS transistor is connected to the output terminal of the SoC unit, the drain of the N-type MOS transistor is connected to the input terminal of the third resistor and the shutdown control pin of the power amplifier chip, and the output terminal of the third resistor is grounded. The N-type MOS transistor is used to adjust its own working state according to the power-down detection signal to control the connection state between the SoC unit and the power amplifier chip. The SoC unit is used as the signal generation source of the volume control signal. The third resistor is used to provide a pull-down voltage for the drain of the N-type MOS transistor.

6. The circuit of claim 5, wherein, When the power supply voltage detected by the power-down detection module is in a non-power-down state, the N-type MOS transistor is in a conducting state after receiving the power-down detection signal generated by the power-down detection module. The connection between the SoC unit and the power amplifier chip is established. The high-level control signal output by the SoC unit is used as a volume control signal and sent to the power amplifier chip through the N-type MOS transistor, so that the power amplifier chip is turned on and outputs sound normally.

7. The circuit of claim 5, wherein, When the power supply voltage detected by the power-down detection module is in a power-down state, the N-type MOS transistor is in a turn-off state after receiving the power-down detection signal generated by the power-down detection module. The connection between the SoC unit and the power amplifier chip is blocked. The pull-down voltage provided by the third resistor to the drain of the N-type MOS transistor serves as a volume control signal to keep the power amplifier chip in a turn-off state and prevent sound output.

8. A power amplifier device, characterized by, The power amplifier device includes a power amplifier chip and a power failure anti-explosive circuit as described in any one of claims 1 to 7; The power failure anti-explosive circuit includes a power failure detection module and a volume control module; the output terminal of the power failure detection module is connected to the controlled terminal of the volume control module, and the control terminal of the volume control module is connected to the shutdown control pin of the power amplifier chip.

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