Power amplifier circuit with multiple sound sources sharing one output and corresponding electronic equipment

Abstract

The utility model provides a power amplifier circuit with multiple sound sources sharing one output. An audio output module is used for outputting a first low-power audio signal and a second low-power audio signal. The analog switch module can select the first low-power audio signal and the second low-power audio signal based on the control signal output by the control module, so that the analog switch module outputs the first low-power audio signal or the second low-power audio signal. Moreover, the filtering module can carry out filtering operation on the first small-power audio signal or the second small-power audio signal. The power amplification module may perform a power amplification operation on the first low-power audio signal to generate a first high-power audio signal. Alternatively, the power amplification module may perform a power amplification operation on the second low-power audio signal to generate a second high-power audio signal. Moreover, the anti-static module can be used for carrying out electrostatic protection on the first high-power audio signal or the second high-power audio signal.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, in particular to a power amplifier circuit with multiple sound sources sharing one output and corresponding electronic equipment. Background Art

[0002] In modern life, audio amplifier circuits are widely used in electronic devices with speakers. If an electronic device wants to output two audio sources, such as a 4G module for calls and a Bluetooth module for music, two audio amplifier circuits must be built simultaneously. Furthermore, the electronic device must also be designed with two speakers to output the sound. Consequently, existing electronic devices with speakers suffer from high costs and complex control logic.

[0003] Therefore, it is necessary to provide a power amplifier circuit and corresponding electronic equipment that allow multiple sound sources to share one output to solve the above technical problems. Utility Model Content

[0004] The utility model provides a lunch break desk footrest and a corresponding lunch break desk, which effectively solves the technical problems of the existing electronic equipment with audio equipment having high cost and complicated control logic.

[0005] The utility model provides a power amplifier circuit for multiple sound sources to share one output, which includes:

[0006] An audio output module, configured to output a first low-power audio signal and a second low-power audio signal;

[0007] A control module, configured to output a control signal;

[0008] an analog switch module, one end of which is connected to the input module and the other end of which is connected to the power amplification module, the analog switch module being configured to select the first low-power audio signal and the second low-power audio signal based on the control signal, so that the analog switch module outputs the first low-power audio signal or the analog switch module outputs the second low-power audio signal;

[0009] a filtering module connected in parallel between the analog switch module and the power amplification module, and configured to perform a filtering operation on the first low-power audio signal or to perform a filtering operation on the second low-power audio signal;

[0010] The power amplification module is configured to perform a power amplification operation on the first low-power audio signal to generate a first high-power audio signal, and transmit the first high-power audio signal to a load; or to perform a power amplification operation on the second low-power audio signal to generate a second high-power audio signal, and transmit the second high-power audio signal to the load;

[0011] An anti-static module is connected in parallel with the power amplification module and is used to provide electrostatic protection for the first high-power audio signal; or to provide electrostatic protection for the second high-power audio signal.

[0012] Furthermore, the analog switch module includes an analog switch chip, the analog switch chip includes a first input pin, a second input pin, a control pin and an output pin, the first input pin and the second input pin are connected to the audio output module, the first input pin is used to input the first low-power audio signal, the second input pin is used to input the second low-power audio signal, the control pin is connected to the control module, the control pin is used to receive the control signal, and the analog switch chip is used to select the first low-power audio signal and the second low-power audio signal based on the control signal;

[0013] When the control signal is a high-level signal, the output pin is used to output the first low-power audio signal; when the control signal is a low-level signal, the output pin is used to output the second low-power audio signal.

[0014] Furthermore, the power amplifier module includes a power amplifier chip, the power amplifier chip includes an amplifier input pin and an amplifier output pin, the amplifier input pin is connected to the output pin, and the amplifier output pin is connected to the load;

[0015] The amplifier input pin is used to input the first low-power audio signal, the power amplifier chip is used to perform a power amplification operation on the first low-power audio signal to generate a first high-power audio signal, and the amplifier output pin is used to transmit the first high-power audio signal to a load; or, the amplifier input pin is used to input the second low-power audio signal, the power amplifier chip is used to perform a power amplification operation on the second low-power audio signal to generate a second high-power audio signal, and the amplifier output pin is used to transmit the second high-power audio signal to a load.

[0016] Furthermore, the filtering module includes a filter capacitor, one end of the filter capacitor is connected between the and the amplifier input pins, and the other end of the filter capacitor is grounded, and the filter capacitor is used to filter the first low-power audio signal or the second low-power audio signal.

[0017] Furthermore, the anti-static module includes a transient voltage suppression diode, one end of which is connected to the amplifier output pin, and the other end of which is grounded, and the transient voltage suppression diode is used to provide electrostatic protection for the first high-power audio signal or the second high-power audio signal.

[0018] Furthermore, the power amplification module also includes a current limiting resistor, one end of the current limiting resistor is connected to the output pin, and the other end of the current limiting resistor is connected to the amplification input pin, and the current limiting resistor is used to perform current limiting operation on the first low-power audio signal or the second low-power audio signal.

[0019] Furthermore, the power amplifier circuit that shares one output with multiple sound sources includes a power supply module, the power amplifier chip includes a VDD pin, the power supply module is connected to the VDD pin, the power supply module is used to output a power supply voltage, and the power supply voltage is used to power the power amplifier chip.

[0020] Furthermore, the power amplification module includes a filtering unit, one end of the filtering unit is connected to the VDD pin, and the other end of the filtering unit is grounded, and the filtering unit is used to perform a filtering operation on the supply voltage.

[0021] An electronic device, characterized in that it comprises any of the above-mentioned power amplifier circuits with multiple sound sources sharing one output.

[0022] Compared to the prior art, the present invention has the following beneficial effects: The present invention provides a power amplifier circuit that allows multiple sound sources to share a single output. The power amplifier circuit includes an audio output module, a control module, an analog switch module, and a power amplifier module. The audio output module can output a first low-power audio signal and a second low-power audio signal, and the control module can output a control signal. The analog switch module can select between the first low-power audio signal and the second low-power audio signal based on the control signal output by the control module, and then output either the first low-power audio signal or the second low-power audio signal. The power amplifier module can amplify the first low-power audio signal to generate a first high-power audio signal, which can then be transmitted to a load. Alternatively, the power amplifier module can amplify the second low-power audio signal to generate a second high-power audio signal, which can then be transmitted to a load. The present invention achieves the output of two audio sources by enabling the analog switch module to select between the first low-power audio signal and the second low-power audio signal. Therefore, the amplifier circuit for multiple sound sources sharing a single output only requires one audio amplifier circuit and one speaker output element. This results in a relatively simple circuit structure and low cost, effectively resolving the high cost issue associated with existing electronic devices with audio. This eliminates the need for two audio amplifier circuits or two speaker output elements, facilitating optimized circuit layout within the electronic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. The drawings described below are only drawings corresponding to some embodiments of the present invention.

[0024] Figure 1 This is a block diagram of an embodiment of a power amplifier circuit in which multiple sound sources share one output according to the present invention.

[0025] Figure 2 This is a circuit diagram of an analog switch module of an embodiment of a power amplifier circuit in which multiple sound sources share one output according to the present invention.

[0026] Figure 3 This is a circuit diagram of a power amplifier module of an embodiment of a power amplifier circuit in which multiple sound sources share one output according to the present invention.

[0027] In the figure, 10, a power amplifier circuit with multiple sound sources sharing one output; 11, an audio output module; 12, a control module; 13, an analog switch module; 14, a filter module; 15, a power amplifier module; 151, a filter unit; 16, an anti-static module; 17, a power supply module; 18, a chip control module; 19, a load. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0029] Directional terms mentioned in this invention, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "side", "top" and "bottom", are only used with reference to the directions of the drawings. The directional terms used are used to illustrate and understand the invention, and are not intended to limit the invention.

[0030] The terms "first" and "second" in the present invention are used for descriptive purposes only and should not be understood as indicating or implying relative importance, nor as limiting the order of precedence.

[0031] In the figures, structurally similar elements are denoted by the same reference numerals.

[0032] Please refer to Figure 1The utility model provides a power amplifier circuit 10 with multiple sound sources sharing one output. The power amplifier circuit 10 with multiple sound sources sharing one output is applied to an electronic device. The power amplifier circuit 10 with multiple sound sources sharing one output includes an audio output module 11, a control module 12, an analog switch module 13, a filter module 14, a power amplifier module 15, and an anti-static module 16. The audio output module 11 can output a first low-power audio signal and a second low-power audio signal, and the control module 12 can output a control signal. One end of the analog switch module 13 is connected to the input module, and the other end of the analog switch module 13 is connected to the power amplifier module 15. The analog switch module 13 can select the first low-power audio signal and the second low-power audio signal based on the control signal, so that the analog switch module 13 outputs the first low-power audio signal, or the analog switch module 13 outputs the second low-power audio signal.

[0033] Please refer to Figure 1 The filter module 14 is connected in parallel between the analog switch module 13 and the power amplifier module 15. The filter module 14 can filter the first low-power audio signal. Alternatively, the filter module 14 can filter the second low-power audio signal. The power amplifier module 15 can amplify the first low-power audio signal, thereby generating a first high-power audio signal. The power amplifier module 15 can transmit the first high-power audio signal to the load 19. Alternatively, the power amplifier module 15 can amplify the second low-power audio signal, thereby generating a second high-power audio signal. The power amplifier module 15 can transmit the second high-power audio signal to the load 19. The load 19 can be a speaker, and the load 19 can emit sound based on the first high-power audio signal or the second high-power audio signal. The anti-static module 16 is connected in parallel with the power amplifier module 15. The anti-static module 16 can provide electrostatic protection for the first high-power audio signal. Alternatively, the anti-static module 16 can provide electrostatic protection for the second high-power audio signal.

[0034] Please refer to Figure 2 and Figure 3 The following is a detailed description of the specific structure of the power amplifier circuit 10 for multiple sound sources sharing one output:

[0035] Please refer to Figure 2The analog switch module 13 includes an analog switch chip U18, which includes a first input pin, a second input pin, a control pin, and an output pin. The first input pin and the second input pin are connected to the audio output module 11, and the first input pin includes a first input pin NO1 and a first input pin NO2, and the second input pin includes a second input pin NC1 and a second input pin NC2. The first input pin can input a first low-power audio signal, and the second input pin can input a second low-power audio signal. The control pin is connected to the control module 12, and the control pin includes a control pin IN1 and a control pin IN2. The control pin can receive a control signal, and the analog switch chip U18 can select the first low-power audio signal and the second low-power audio signal based on the control signal. Among them, the output pin includes an output pin COM1 and an output pin COM1. When the control signal is a high-level signal, the output pin can output the first low-power audio signal. When the control signal is a low-level signal, the output pin can output the second low-power audio signal. The analog switch chip U18 further includes a V+ pin. The power amplifier circuit 10 in which multiple sound sources share one output includes a power supply VCC_3V3, which is connected to the V+ pin.

[0036] Please refer to Figure 3 The power amplifier module 15 includes a power amplifier chip U5, which includes an amplifier input pin and an amplifier output pin. The amplifier input pin is connected to the output pin, and the amplifier output pin is connected to the load 19. The amplifier input pin includes an amplifier input pin IN+ and an amplifier input pin IN-, and the amplifier output pin includes an amplifier output pin OV1 and an amplifier output pin OV2. The amplifier input pin IN is connected to the output pin COM1, and the amplifier input pin IN- is connected to the output pin COM2. The amplifier input pin is used to input a first low-power audio signal, and the power amplifier chip U5 can perform a power amplification operation on the first low-power audio signal. The power amplifier chip U5 can generate a first high-power audio signal, and the amplifier output pin is used to transmit the first high-power audio signal to the load 19. Alternatively, the amplifier input pin is used to input a second low-power audio signal, and the power amplifier chip U5 can perform a power amplification operation on the second low-power audio signal. The power amplifier chip U5 can generate a second high-power audio signal, and the amplifier output pin is used to transmit the second high-power audio signal to the load 19.

[0037] Please refer to Figure 3, the filtering module 14 includes a filter capacitor. One end of the filter capacitor is connected between the amplifier input pin and the amplifier input pin, and the other end of the filter capacitor is grounded. The filter capacitor can filter the first low-power audio signal or the second low-power audio signal. Among them, the filter capacitor includes filter capacitor C38, filter capacitor C39, filter capacitor C40, and filter capacitor C41. The filter capacitor can filter out the interference components in the first low-power audio signal or the second low-power audio signal, so the setting of the filter capacitor can make the first low-power audio signal or the second low-power audio signal more stable. The power amplifier circuit 10 with multiple sound sources sharing one output also includes capacitor C36 and capacitor C37. Capacitor C36 and capacitor C37 can further filter out the interference components in the first low-power audio signal or the second low-power audio signal.

[0038] Please refer to Figure 3 The anti-static module 16 includes a transient voltage suppressor (TVS) diode. One end of the TVS diode is connected to the amplifier output pin, and the other end of the TVS diode is grounded. The TVS diodes include a TVS diode D2 and a TVS diode D4. The TVS diodes can provide static protection for the first high-power audio signal or the second high-power audio signal. When static electricity is generated in the circuit, the TVS diode absorbs the static electricity to the ground terminal, thereby protecting the components in the circuit from damage caused by static electricity.

[0039] Please refer to Figure 3 The power amplifier module 15 also includes a current-limiting resistor, which includes a current-limiting resistor R7 and a current-limiting resistor R12. One end of the current resistor is connected to the output pin, and the other end of the current-limiting resistor is connected to the amplifier input pin. The current-limiting resistor can limit the current of the first low-power audio signal or the second low-power audio signal. Because the current-limiting resistor can limit the current of the first low-power audio signal or the second low-power audio signal, it can prevent the first low-power audio signal or the second low-power audio signal from damaging the power amplifier chip U5 due to excessive current. In addition, the power amplifier circuit 10 with multiple sound sources sharing one output also includes capacitors C22 and C23.

[0040] Please refer to Figure 3The power amplifier circuit 10 in which multiple sound sources share one output includes a power supply module 17. The power amplifier chip U5 includes a VDD pin, and the power supply module 17 is connected to the VDD pin. The power supply module 17 is used to output a power supply voltage, and the power supply voltage is used to power the power amplifier chip U5. The power amplifier module 15 includes a filter unit 151, one end of the filter unit 151 is connected to the VDD pin, and the other end of the filter unit 151 is grounded, and the filter unit 151 is used to filter the power supply voltage. Among them, the filter unit 151 includes a filter capacitor C92. Since the filter unit 151 can filter out the noise in the power supply voltage, the power supply voltage is relatively stable and will not fluctuate. Furthermore, the power supply voltage can stably power the power amplifier chip U5 for a long time.

[0041] Please refer to Figure 3 The power amplifier circuit 10, which supports multiple sound sources sharing a single output, includes a feedback resistor R25. One end of the feedback resistor R25 is connected to the amplifier input pin IN-, and the other end is connected to the amplifier output pin 0V. The feedback resistor R25 can be used to adjust the amplification factor of the power amplifier chip U5, thereby ensuring more stable operation of the power amplifier chip U5. The power amplifier chip U5 also includes a BYPASS pin. The power amplifier circuit 10, which supports multiple sound sources sharing a single output, includes a resistor R20 and a capacitor R19. One end of the resistor R20 is connected to the BYPASS pin, and the other end is connected to the amplifier input pin IN+. One end of the capacitor R19 is connected to the BYPASS pin, and the other end is grounded. The power amplifier circuit 10, which supports multiple sound sources sharing a single output, also includes a chip control module 18. The power amplifier chip U5 also includes an SD pin, to which the chip control module 18 is connected. The chip control module 18 can output a chip control signal, which can be used to control the operation of the power amplifier chip U5. When the chip control module 18 outputs a low-level chip control signal to the power amplifier chip U5, the power amplifier chip U5 is in a stopped state. When the chip control module 18 outputs a high-level chip control signal to the power amplifier chip U5, the power amplifier chip U5 is in a normal working state.

[0042] The working principle of the present invention is as follows: When the power amplifier circuit 10 with multiple sound sources sharing a common output is operating, the audio output module 11 can output a first low-power audio signal and a second low-power audio signal, and the control module 12 can output a control signal. Subsequently, the first input pin of the analog switch chip U18 can input the first low-power audio signal, and the second input pin of the analog switch chip U18 can input the second low-power audio signal. In addition, the control pin of the analog switch chip U18 can receive the control signal. Then, the analog switch chip U18 can select between the first low-power audio signal and the second low-power audio signal based on the control signal. When the control signal is a high-level signal, the output pin can output the first low-power audio signal. When the control signal is a low-level signal, the output pin can output the second low-power audio signal. In order to filter the first low-power audio signal or the second low-power audio signal, a filter module 14 is connected in parallel between the analog switch module 13 and the power amplifier module 15. Then, the power amplification module 15 can perform a power amplification operation on the first low-power audio signal, the power amplification module 15 can generate a first high-power audio signal, and the power amplification module 15 can transmit the first high-power signal to the load 19. Alternatively, the power amplification module 15 can perform a power amplification operation on the second low-power audio signal. The power amplification module 15 can generate a second high-power audio signal, and the power amplification module 15 can transmit the second high-power audio signal to the load 19. Since the anti-static module 16 is connected in parallel with the power amplification module 15, the anti-static module 16 can perform electrostatic protection on the first high-power audio signal or the second high-power audio signal. Afterwards, the load 19 can emit a sound based on the first high-power audio signal or the second high-power audio signal.

[0043] The present invention provides a power amplifier circuit for multiple sound sources sharing a single output. The power amplifier circuit for multiple sound sources sharing a single output includes an audio output module, a control module, an analog switch module, and a power amplifier module. The audio output module can output a first low-power audio signal and a second low-power audio signal, and the control module can output a control signal. The analog switch module can select between the first low-power audio signal and the second low-power audio signal based on the control signal output by the control module, and then the analog switch module outputs either the first low-power audio signal or the second low-power audio signal. The power amplifier module can amplify the first low-power audio signal, generate a first high-power audio signal, and transmit the first high-power signal to a load. Alternatively, the power amplifier module can amplify the second low-power audio signal, generate a second high-power audio signal, and transmit the second high-power audio signal to a load. The present invention can output two audio sources by selecting between the first low-power audio signal and the second low-power audio signal through the analog switch module. Therefore, the amplifier circuit for multiple sound sources sharing a single output only requires one audio amplifier circuit and one speaker output element. This results in a relatively simple circuit structure and low cost, effectively resolving the high cost issue associated with existing electronic devices with audio. This eliminates the need for two audio amplifier circuits or two speaker output elements, facilitating optimized circuit layout within the electronic device.

[0044] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. A person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined by the claims.

Claims

1. A power amplifier circuit for multiple sound sources sharing one output, characterized in that: These include, An audio output module, configured to output a first low-power audio signal and a second low-power audio signal; A control module, configured to output a control signal; an analog switch module, one end of which is connected to the audio output module and the other end of which is connected to the power amplification module, wherein the analog switch module is configured to select the first low-power audio signal and the second low-power audio signal based on the control signal, so that the analog switch module outputs the first low-power audio signal or the analog switch module outputs the second low-power audio signal; a filtering module connected in parallel between the analog switch module and the power amplification module, and configured to perform a filtering operation on the first low-power audio signal or to perform a filtering operation on the second low-power audio signal; The power amplification module is configured to perform a power amplification operation on the first low-power audio signal to generate a first high-power audio signal, and transmit the first high-power audio signal to a load; or to perform a power amplification operation on the second low-power audio signal to generate a second high-power audio signal, and transmit the second high-power audio signal to the load; An anti-static module is connected in parallel with the power amplification module and is used to provide electrostatic protection for the first high-power audio signal; or to provide electrostatic protection for the second high-power audio signal.

2. The power amplifier circuit for multiple sound sources sharing one output according to claim 1, characterized in that: The analog switch module includes an analog switch chip, which includes a first input pin, a second input pin, a control pin, and an output pin. The first input pin and the second input pin are connected to the audio output module. The first input pin is used to input the first low-power audio signal, and the second input pin is used to input the second low-power audio signal. The control pin is connected to the control module, and the control pin is used to receive the control signal. The analog switch chip is used to select the first low-power audio signal and the second low-power audio signal based on the control signal. When the control signal is a high-level signal, the output pin is used to output the first low-power audio signal; when the control signal is a low-level signal, the output pin is used to output the second low-power audio signal.

3. The power amplifier circuit for multiple sound sources sharing one output according to claim 2, characterized in that: The power amplifier module includes a power amplifier chip, and the power amplifier chip includes an amplifier input pin and an amplifier output pin, the amplifier input pin is connected to the output pin, and the amplifier output pin is connected to the load; The amplifier input pin is used to input the first low-power audio signal, the power amplifier chip is used to perform a power amplification operation on the first low-power audio signal to generate a first high-power audio signal, and the amplifier output pin is used to transmit the first high-power audio signal to a load; or, the amplifier input pin is used to input the second low-power audio signal, the power amplifier chip is used to perform a power amplification operation on the second low-power audio signal to generate a second high-power audio signal, and the amplifier output pin is used to transmit the second high-power audio signal to a load.

4. The power amplifier circuit for multiple sound sources sharing one output according to claim 3, characterized in that: The filtering module includes a filter capacitor, one end of which is connected to the amplifier input pin, and the other end of which is grounded. The filter capacitor is used to filter the first low-power audio signal or the second low-power audio signal.

5. The power amplifier circuit for multiple sound sources sharing one output according to claim 4, characterized in that: The anti-static module includes a transient voltage suppression diode, one end of which is connected to the amplifier output pin, and the other end of which is grounded. The transient voltage suppression diode is used to provide electrostatic protection for the first high-power audio signal or the second high-power audio signal.

6. The power amplifier circuit for multiple sound sources sharing one output according to claim 4, characterized in that: The power amplification module further includes a current limiting resistor, one end of which is connected to the output pin, and the other end of which is connected to the amplification input pin, and the current limiting resistor is used to perform current limiting operation on the first high-power audio signal or the second high-power audio signal.

7. The power amplifier circuit for multiple sound sources sharing one output according to claim 3, characterized in that: The power amplifier circuit that uses multiple sound sources to share one output includes a power supply module. The power amplifier chip includes a VDD pin. The power supply module is connected to the VDD pin. The power supply module is used to output a power supply voltage, and the power supply voltage is used to power the power amplifier chip.

8. The power amplifier circuit for multiple sound sources sharing one output according to claim 7, characterized in that: The power amplification module includes a filter unit, one end of the filter unit is connected to the VDD pin, and the other end of the filter unit is grounded. The filter unit is used to perform a filtering operation on the supply voltage.

9. An electronic device, characterized in that: It comprises the power amplifier circuit with multiple sound sources sharing one output as described in any one of claims 1-8.

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