A dual-channel push-pull output amplification circuit and electronic device

Abstract

The utility model relates to circuit technical field discloses a kind of double sound track push-pull output amplification circuit, and the circuit includes: power module, frequency selection module and two sound track module;Power module is used to provide stable electric energy for frequency selection module and sound track module respectively, frequency selection module is used to carry out frequency selection amplification processing to input audio signal, and output to sound track module;Sound track module includes pre-stage amplification circuit and push-pull output circuit, the input end of pre-stage amplification circuit is connected with the output end of frequency selection module, push-pull output circuit is used to receive the audio signal after pre-stage amplification circuit processing and carry out push-pull power amplification;Wherein, push-pull output circuit includes complementary push-pull amplification circuit by transistor as pre-stage bias circuit.This application realizes low static power consumption design by the push-pull output circuit of two sound track modules, can also reduce heat accumulation while power amplification, and make power consumption reduce.

Description

Technical Field

[0001] This utility model belongs to the field of circuit technology, specifically relating to a dual-channel push-pull output amplifier circuit and electronic equipment. Background Technology

[0002] In audio circuits, the power amplifier topology is the core technology supporting the realization of electrical signal power amplification, and directly determines the signal driving capability and energy conversion efficiency of electronic devices.

[0003] Currently, in dual-channel audio circuits, the overall system power consumption is high and heat accumulation is more serious in high-power scenarios. The energy conversion efficiency is low, which can easily lead to problems such as channel gain deviation and inconsistent distortion in the output audio signal, seriously affecting core performance such as audio fidelity. Utility Model Content

[0004] This application provides a dual-channel push-pull output amplifier circuit. This circuit achieves a low static power consumption design through the push-pull output circuit of two channel modules, and can reduce heat accumulation while amplifying power.

[0005] This application discloses a dual-channel push-pull output amplifier circuit, comprising: The system includes a power supply module, a frequency selection module, and two channel modules. The power supply module provides stable power to the frequency selection module and the channel modules respectively. The frequency selection module performs frequency selection amplification on the input audio signal and outputs it to the channel modules. The channel module includes a preamplifier circuit and a push-pull output circuit. The input terminal of the preamplifier circuit is connected to the output terminal of the frequency selection module. The push-pull output circuit is used to receive the audio signal processed by the preamplifier circuit and perform push-pull power amplification. The push-pull output circuit includes a complementary push-pull amplifier circuit with a transistor as the pre-stage bias circuit.

[0006] In some embodiments, the push-pull output circuit includes a first transistor Q1, a second transistor Q2, a third transistor Q3, and a fourth transistor Q4. The input terminals of the push-pull output circuit are respectively connected to the gates of the first transistor Q1 and the second transistor Q2. The power supply module is respectively connected to the collectors of the first transistor Q1, the collectors of the third transistor Q3, the emitters of the second transistor Q2, and the emitters of the fourth transistor Q4. The output terminals of the push-pull output circuit are respectively connected to the emitters of the third transistor Q3 and the collectors of the fourth transistor Q4. The gate of the third transistor Q3 is connected to the emitter of the first transistor Q1, and the gate of the fourth transistor Q4 is connected to the collector of the second transistor Q2. The emitter of the first transistor Q1, the collector of the second transistor Q2, the emitter of the third transistor Q3, and the collector of the fourth transistor Q4 are all connected to the first node P1.

[0007] In some embodiments, the push-pull output circuit further includes a first capacitor C1, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4. The second transistor Q2 is connected to the input terminal of the push-pull output circuit and the gate of the first transistor Q1 through the first capacitor C1. The emitter of the first transistor Q1 and the gate of the third transistor Q3 are both connected to the first node P1 through the first resistor R1. The emitter of the second transistor Q2 and the gate of the fourth transistor Q4 are both connected to the first node P1 through the second resistor R2. The emitter of the third transistor Q3 is connected to the first node P1 through the third resistor R3. The collector of the fourth transistor Q4 is connected to the first node P1 through the fourth resistor R4.

[0008] In some embodiments, the preamplifier circuit includes a fifth transistor Q5 and a fifth resistor R5. The emitter of the fifth transistor Q5 is connected to the input terminals of the power supply module and the push-pull output circuit, respectively. The gate of the fifth transistor Q5 is connected to the output terminal of the frequency selection module, and the collector of the fifth transistor Q5 is connected to the emitter of the fifth transistor Q5. One end of the fifth resistor R5 is connected to the collector of the fifth transistor Q5, and the other end of the fifth resistor R5 is connected to the gate of the fifth transistor Q5.

[0009] In some embodiments, the audio module further includes a first inductor L1, a sixth resistor R6, a seventh resistor R7, and a second capacitor C2. The first inductor L1 and the sixth resistor R6 are connected in parallel to form a filter circuit, which is connected in parallel to the output terminal of the push-pull output circuit. The seventh resistor R7 and the second capacitor C2 are connected in series to form a Jobel network, one end of which is connected to the filter circuit, and the other end of which is grounded.

[0010] In some embodiments, the power supply module includes a rectifier bridge, a filter capacitor bank, and a voltage regulator circuit. The two AC input terminals of the rectifier bridge are connected to an external power supply system, and the two DC input terminals of the rectifier bridge are respectively connected to the two ends of the filter capacitor bank. The voltage regulator circuit is respectively connected to the VEE terminal and the VCC terminal of the filter capacitor bank and outputs a regulated power supply for the frequency selection module.

[0011] In some embodiments, the frequency selection module includes a first amplifier U1 and a second amplifier U2 for amplifying audio signals. The output terminals of the first amplifier U1 and the second amplifier U2 are respectively connected to the two channel modules for outputting left and right channel signals. The power supply terminals of the first amplifier U1 and / or the second amplifier U2 are connected to the regulated power supply.

[0012] In some embodiments, the frequency selection module further includes an eighth resistor R8, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, and a sixth capacitor C6. One end of the eighth resistor R8 is used to connect to an externally input audio signal, and the other end is connected to the third capacitor C3, the fourth capacitor C4, and the second node P2, respectively. The other end of the third capacitor C3 is connected to the second node P2 and the sixth capacitor C6 respectively, and the other end of the fourth capacitor C4 is connected to the second node P2 and the fifth capacitor C5 respectively; One end of the sixth capacitor C6 is grounded, and the other end of the sixth capacitor C6 is connected to the input terminal of the first amplifier U1 and the second node P2 respectively. One end of the fifth capacitor C5 is grounded, and the other end of the fifth capacitor C5 is connected to the input terminal of the second amplifier U2 and the second node P2 respectively.

[0013] In some embodiments, the frequency selection module further includes a seventh capacitor C7, an eighth capacitor C8, a ninth resistor R9, and a tenth resistor R10; The first input terminal of the first amplifier U1 is connected to the third capacitor C3, the second node P2 and the sixth capacitor C6 respectively. The second input terminal of the first amplifier U1 is connected to the output terminal of the channel module and the ninth resistor R9 respectively. The other end of the ninth resistor R9 is connected to the second node P2 through the seventh capacitor C7. The first input terminal of the second amplifier U2 is connected to the fourth capacitor C4, the second node P2 and the fifth capacitor C5 respectively. The second input terminal of the second amplifier U2 is connected to the output terminal of another channel module and the tenth resistor R10 respectively. The other end of the tenth resistor R10 is connected to the second node P2 through the eighth capacitor C8.

[0014] This application also discloses an electronic device comprising a dual-channel push-pull output amplifier circuit as described in any of the preceding claims.

[0015] As described above, the dual-channel push-pull output amplifier circuit in this application includes a frequency selection module, two channel modules, and a power supply module that provides stable power to the frequency selection module and the two channel modules respectively. The frequency selection module is used to select the frequency of the input audio signal and perform preliminary amplification. The channel modules include a preamplifier circuit and a push-pull output circuit. The preamplifier circuit receives the output signal from the frequency selection module, further amplifies and conditions the waveform, and then outputs the processed signal to the push-pull output circuit. Through the transistor preamplifier bias and complementary push-pull amplification structure design, it receives the preamplifier signal and achieves power amplification. In a dual-channel scenario, the dual-channel push-pull output amplifier circuit, through the low static power consumption design of the two channel modules, can reduce heat accumulation while amplifying power. In addition, the complementary structure of the push-pull output can cancel harmonic distortion, and the use of transistor bias circuit eliminates crossover distortion, thereby ensuring audio fidelity. Attached Figure Description

[0016] Figure 1 A schematic diagram of the framework structure of the dual-channel push-pull output amplifier circuit provided in the embodiments of this application.

[0017] Figure 2 This is a schematic diagram of the power module provided in an embodiment of this application.

[0018] Figure 3 This is a schematic diagram of the frequency selection module provided in an embodiment of this application.

[0019] Figure 4 This is a schematic diagram of the structure of the audio channel module provided in an embodiment of this application.

[0020] Figure 5 This is a schematic diagram of the frame structure of the electronic device provided in the embodiments of this application. Detailed Implementation

[0021] The preferred embodiments of this application will now be described in detail with reference to the accompanying drawings, so that the advantages and features of this application can be more easily understood by those skilled in the art, thereby providing a clearer definition of the scope of protection of this application.

[0022] Please refer to the diagrams, where the same component symbols represent the same components. The principles of this application are illustrated by example in a suitable computing environment. The following description is based on the specific embodiments of this application exemplified, and should not be construed as limiting other specific embodiments not detailed herein.

[0023] Please see Figure 1 The figure shows the framework structure of the dual-channel push-pull output amplifier circuit provided in the embodiment of this application.

[0024] like Figure 1As shown, the dual-channel push-pull output amplifier circuit includes a power supply module, a frequency selection module, and two channel modules. The power supply module provides stable power to the frequency selection module and the channel modules respectively. The frequency selection module performs frequency selection amplification on the input audio signal and outputs it to the channel modules. The channel modules include a preamplifier circuit 31 and a push-pull output circuit 32. The input terminal of the preamplifier circuit 31 is connected to the output terminal of the frequency selection module. The push-pull output circuit 32 receives the audio signal processed by the preamplifier circuit 31 and performs push-pull power amplification. The push-pull output circuit 32 includes a complementary push-pull amplifier circuit with transistors as the preamplifier bias circuit.

[0025] Specifically, the power supply module can be, but is not limited to, connected to a power supply system. It converts the input power and provides stable electrical energy to the frequency selection module and the channel module, ensuring their stable operation. The power supply module also includes rectification, filtering, and voltage regulation functions. The frequency selection module is used to selectively amplify the input audio signal. It can optionally, but is not limited to, using an RC network for frequency selection and filtering. The frequency selection module selects high and low frequencies and can also perform preliminary signal amplification through operational amplifiers, suppressing external noise interference before outputting to subsequent circuitry, namely the channel module.

[0026] The audio module includes a preamplifier circuit 31 and a push-pull output circuit 32. The preamplifier circuit amplifies the frequency-selected signal, adjusting the signal waveform and providing gain to match the input requirements of the push-pull output circuit 32. The push-pull output circuit 32 amplifies the audio signal and includes a complementary push-pull amplifier circuit. A transistor is used as its pre-bias circuit, providing a suitable static bias to prevent crossover distortion. The complementary push-pull amplifier circuit amplifies the power based on the input audio signal.

[0027] Understandably, a dual-channel push-pull output amplifier circuit includes two channel modules, one for the left channel and one for the right channel. The connection structures and components within the two channel modules are identical to ensure dual-channel consistency.

[0028] In this embodiment, the circuit includes a power supply module, a frequency selection module, and a channel module. The channel module, through the preamplifier circuit 31 and the push-pull output circuit 32, achieves power amplification while reducing power consumption and heat accumulation. Its static power consumption is extremely low, which can increase the energy conversion efficiency from the traditional 50% to 80%. In addition, the push-pull output circuit 32 uses transistors as the preamplifier, and its bias voltage is set at the turn-on voltage, so that the static current is locked, overcoming the crossover distortion problem of the circuit.

[0029] like Figure 2 As shown, in some embodiments, the power module includes a rectifier bridge, a filter capacitor bank, and a voltage regulator circuit.

[0030] Specifically, the two AC input terminals of the rectifier bridge are connected to an external power supply system, the two DC input terminals of the rectifier bridge are connected to the two ends of the filter capacitor bank respectively, and the voltage regulator circuit is connected to the VEE terminal and VCC terminal of the filter capacitor bank respectively, and outputs a regulated power supply for the frequency selection module.

[0031] The rectifier bridge includes a bridge rectifier circuit composed of four diodes, connected to a filter capacitor bank, and outputs to the VCC and VEE terminals respectively, thereby filtering out AC ripple in the DC voltage and obtaining a more stable DC voltage. The power module also includes a voltage regulator circuit connected to the VCC and VEE terminals. This circuit provides voltages of VCC+15 and VCC+12 respectively through selectable, but not limited to, voltage regulator chips, outputting to the VCC+15 and VCC+12 terminals to provide individual power to components in subsequent circuits.

[0032] It is understood that the VCC+15 and VCC+12 terminals of the power module supply power to the pre-amplifier circuit, while the VCC and VEE terminals supply power to the subsequent power amplifier circuit. The voltage regulator circuit may optionally include, but is not limited to, capacitors, resistors, and LEDs. The LEDs are connected in series in the circuit and have a minimum operating voltage to indicate whether the circuit voltage is normal.

[0033] like Figure 3 As shown, the frequency selection module includes a first amplifier U1, a second amplifier U2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, an eighth resistor R8, a ninth resistor R9, and a tenth resistor R10.

[0034] Specifically, the first amplifier U1 and the second amplifier U2 are used to amplify audio signals. The output terminals of the first amplifier U1 and the second amplifier U2 are respectively connected to two channel modules and are used to output left and right channel signals respectively. The power supply terminal of the second amplifier U2 is connected to a regulated power supply.

[0035] In this application, the power supply terminal of the second amplifier U2 is connected to the VCC+15 terminal of the voltage regulator circuit to provide power to the second amplifier U2 independently. Whether the first amplifier U1 is powered independently depends on the actual situation. This application does not limit this. That is, the power supply terminals of the first amplifier U1 and / or the second amplifier U2 are connected to the voltage regulator circuit to provide them with a regulated power supply.

[0036] One end of the eighth resistor R8 is used to connect to the external audio input signal, and the other end is connected to the third capacitor C3, the fourth capacitor C4, and the second node P2. The other end of the third capacitor C3 is connected to the second node P2 and the sixth capacitor C6. The other end of the fourth capacitor C4 is connected to the second node P2 and the fifth capacitor C5. One end of the sixth capacitor C6 is grounded, and the other end is connected to the input terminal of the first amplifier U1 and the second node P2. One end of the fifth capacitor C5 is grounded, and the other end is connected to the input terminal of the second amplifier U2 and the second node P2.

[0037] It is worth noting that the third capacitor C3 and the fourth capacitor C4 both serve to select high frequencies in the frequency selection module, while the fifth capacitor C5 and the sixth capacitor C6 both serve to select low frequencies. The second node P2 can also be connected to ground through a resistor.

[0038] In addition, the first input terminal of the first amplifier U1 is connected to the third capacitor C3, the second node P2 and the sixth capacitor C6 respectively. The second input terminal of the first amplifier U1 is connected to the output terminal of the channel module and the ninth resistor R9 respectively. The other end of the ninth resistor R9 is connected to the second node P2 through the seventh capacitor C7. The first input terminal of the second amplifier U2 is connected to the fourth capacitor C4, the second node P2 and the fifth capacitor C5 respectively. The second input terminal of the second amplifier U2 is connected to the output terminal of another channel module and the tenth resistor R10 respectively. The other end of the tenth resistor R10 is connected to the second node P2 through the eighth capacitor C8.

[0039] like Figure 4 As shown, in some embodiments, the push-pull output circuit 32 includes a first transistor Q1, a second transistor Q2, a third transistor Q3, a fourth transistor Q4, a first capacitor C1, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4.

[0040] Specifically, the input terminals of the push-pull output circuit 32 are connected to the gates of the first transistor Q1 and the second transistor Q2, respectively. The power supply module is connected to the collector of the first transistor Q1, the collector of the third transistor Q3, the emitter of the second transistor Q2, and the emitter of the fourth transistor Q4, respectively. The output terminals of the push-pull output circuit are connected to the emitter of the third transistor Q3 and the collector of the fourth transistor Q4, respectively. The gate of the third transistor Q3 is connected to the emitter of the first transistor Q1, and the gate of the fourth transistor Q4 is connected to the collector of the second transistor Q2. The emitters of the first transistor Q1, the collectors of the second transistor Q2, the emitters of the third transistor Q3, and the collectors of the fourth transistor Q4 are all connected to the first node P1.

[0041] In this circuit, the second transistor Q2 is connected to the input terminal of the push-pull output circuit 32 and the gate of the first transistor Q1 via the first capacitor C1. The emitter of the first transistor Q1 and the gate of the third transistor Q3 are both connected to the first node P1 via the first resistor R1. The emitter of the second transistor Q2 and the gate of the fourth transistor Q4 are both connected to the first node P1 via the second resistor R2. The emitter of the third transistor Q3 is connected to the first node P1 via the third resistor R3. The collector of the fourth transistor Q4 is connected to the first node P1 via the fourth resistor R4. The first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 are used to determine parameters such as the amplification factor of the circuit.

[0042] In some embodiments, the preamplifier circuit 31 includes a fifth transistor Q5 and a fifth resistor R5.

[0043] Specifically, the emitter of the fifth transistor Q5 is connected to the input terminals of the power supply module and the push-pull output circuit 32, the gate of the fifth transistor Q5 is connected to the output terminal of the frequency selection module, and the collector of the fifth transistor Q5 is connected to the emitter of the fifth transistor Q5; one end of the fifth resistor R5 is connected to the collector of the fifth transistor Q5, and the other end of the fifth resistor R5 is connected to the gate of the fifth transistor Q5.

[0044] It is worth noting that the VCC terminal of the power module is connected to the collector of the first transistor Q1, the collector of the third transistor Q3, and the collector of the fifth transistor Q5, respectively, and the VEE terminal of the power module is connected to the emitter of the second transistor Q2, the emitter of the fourth transistor Q4, and the emitter of the fifth transistor Q5, respectively.

[0045] In addition, the fifth resistor R5 serves as the bias resistor for the fifth transistor Q5. It can be implemented using two resistors, one of which can be an adjustable resistor, to flexibly optimize the operating state of the preamplifier circuit and adapt to the amplitude of different input signals.

[0046] In some embodiments, the audio module further includes a first inductor L1, a sixth resistor R6, a seventh resistor R7, and a second capacitor C2.

[0047] Specifically, the first inductor L1 and the sixth resistor R6 are connected in parallel to form a filter circuit 33. The filter circuit 33 is connected in parallel to the output terminal of the push-pull output circuit 32. The seventh resistor R7 and the second capacitor C2 are connected in series to form a Jobel network 34. One end of the Jobel network 34 is connected to the filter circuit 33, and the other end of the Jobel network 34 is grounded.

[0048] In some embodiments, reference Figure 4 and combined Figure 3As shown, the dual-channel push-pull output amplifier circuit includes two channel modules. The output terminal of one channel module is FB1, and the output terminal of the other channel module is FB2. That is, the output terminals of the two channel modules are respectively connected to the input terminals of the first amplifier U1 and the second amplifier U2, forming a closed-loop negative feedback loop for each channel, which enables the channel modules to automatically calibrate the gain through the negative feedback mechanism.

[0049] Please see Figure 5 The figure shows a schematic diagram of the structure of the electronic device provided in an embodiment of this application.

[0050] like Figure 5 As shown, the electronic device includes the aforementioned dual-channel push-pull output amplifier circuit 100, battery assembly 4, audio input interface 5, and audio output interface 6.

[0051] Battery assembly 4 provides initial power to power module 1. When the audio signal from the audio source device enters the dual-channel push-pull output amplifier circuit 100 through audio input interface 5, it first passes through frequency selection module 2 to perform frequency selection and preliminary amplification processing on the input audio signal. The processed signal is then synchronously output to the input terminal of the preamplifier circuit 31 in the two channel modules 3. The two channel modules 3 synchronously perform power amplification processing on the frequency-selected signal. The preamplifier circuit 31 receives the output signal from frequency selection module 2 and performs further signal amplification and waveform conditioning on it to match the subsequent push-pull output circuit 32. After the push-pull output circuit 32 completes the power amplification, the two channel modules 3 combine the two independent amplified signals to audio output interface 6 for external output.

[0052] It is worth noting that the dual-channel push-pull output amplifier circuit 100 can be used as a basic power amplifier unit and can be set in any audio adjustment circuit or functional module that requires high-fidelity signal amplification, depending on the actual application. This application does not limit this.

[0053] As used herein, the term "module" can refer to a software or hardware object that executes on the computing system. The various components, modules, engines, and services described herein can be implementations on the computing system. The apparatuses and methods described herein can be implemented in software or hardware, both of which are within the scope of this application.

[0054] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0055] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0056] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. A dual-channel push-pull output amplifier circuit, characterized in that, The circuit includes: a power supply module, a frequency selection module, and two channel modules; the power supply module is used to provide stable power to the frequency selection module and the channel modules respectively, and the frequency selection module is used to perform frequency selection amplification processing on the input audio signal and output it to the channel modules; The channel module includes a preamplifier circuit and a push-pull output circuit. The input terminal of the preamplifier circuit is connected to the output terminal of the frequency selection module. The push-pull output circuit is used to receive the audio signal processed by the preamplifier circuit and perform push-pull power amplification. The push-pull output circuit includes a complementary push-pull amplifier circuit with a transistor as the pre-stage bias circuit.

2. The dual-channel push-pull output amplifier circuit as described in claim 1, characterized in that, The push-pull output circuit includes a first transistor Q1, a second transistor Q2, a third transistor Q3, and a fourth transistor Q4. The input terminals of the push-pull output circuit are respectively connected to the gate of the first transistor Q1 and the gate of the second transistor Q2. The power supply module is respectively connected to the collector of the first transistor Q1, the collector of the third transistor Q3, the emitter of the second transistor Q2, and the emitter of the fourth transistor Q4. The output terminals of the push-pull output circuit are respectively connected to the emitter of the third transistor Q3 and the collector of the fourth transistor Q4. The gate of the third transistor Q3 is connected to the emitter of the first transistor Q1, and the gate of the fourth transistor Q4 is connected to the collector of the second transistor Q2. The emitter of the first transistor Q1, the collector of the second transistor Q2, the emitter of the third transistor Q3, and the collector of the fourth transistor Q4 are all connected to the first node P1.

3. The dual-channel push-pull output amplifier circuit as described in claim 2, characterized in that, The push-pull output circuit also includes a first capacitor C1, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4; The second transistor Q2 is connected to the input terminal of the push-pull output circuit and the gate of the first transistor Q1 through the first capacitor C1. The emitter of the first transistor Q1 and the gate of the third transistor Q3 are both connected to the first node P1 through the first resistor R1. The emitter of the second transistor Q2 and the gate of the fourth transistor Q4 are both connected to the first node P1 through the second resistor R2. The emitter of the third transistor Q3 is connected to the first node P1 through the third resistor R3. The collector of the fourth transistor Q4 is connected to the first node P1 through the fourth resistor R4.

4. The dual-channel push-pull output amplifier circuit as described in claim 1, characterized in that, The preamplifier circuit includes a fifth transistor Q5 and a fifth resistor R5. The emitter of the fifth transistor Q5 is connected to the input terminals of the power supply module and the push-pull output circuit, respectively. The gate of the fifth transistor Q5 is connected to the output terminal of the frequency selection module. The collector of the fifth transistor Q5 is connected to the emitter of the fifth transistor Q5. One end of the fifth resistor R5 is connected to the collector of the fifth transistor Q5, and the other end of the fifth resistor R5 is connected to the gate of the fifth transistor Q5.

5. The dual-channel push-pull output amplifier circuit as described in claim 1, characterized in that, The audio module also includes a first inductor L1, a sixth resistor R6, a seventh resistor R7, and a second capacitor C2. The first inductor L1 and the sixth resistor R6 are connected in parallel to form a filter circuit, which is connected in parallel to the output terminal of the push-pull output circuit. The seventh resistor R7 and the second capacitor C2 are connected in series to form a Jobel network. One end of the Jobel network is connected to the filter circuit, and the other end of the Jobel network is grounded.

6. The dual-channel push-pull output amplifier circuit as described in claim 1, characterized in that, The power supply module includes a rectifier bridge, a filter capacitor bank, and a voltage regulator circuit. The two AC input terminals of the rectifier bridge are connected to an external power supply system, and the two DC input terminals of the rectifier bridge are respectively connected to the two ends of the filter capacitor bank. The voltage regulator circuit is respectively connected to the VEE terminal and the VCC terminal of the filter capacitor bank and outputs a regulated power supply for the frequency selection module.

7. The dual-channel push-pull output amplifier circuit as described in claim 6, characterized in that, The frequency selection module includes a first amplifier U1 and a second amplifier U2 for amplifying audio signals. The output terminals of the first amplifier U1 and the second amplifier U2 are respectively connected to the two channel modules for outputting left and right channel signals. The power supply terminals of the first amplifier U1 and / or the second amplifier U2 are connected to the regulated power supply.

8. The dual-channel push-pull output amplifier circuit as described in claim 7, characterized in that, The frequency selection module also includes an eighth resistor R8, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, and a sixth capacitor C6. One end of the eighth resistor R8 is used to connect to an externally input audio signal, and the other end is connected to the third capacitor C3, the fourth capacitor C4, and the second node P2, respectively. The other end of the third capacitor C3 is connected to the second node P2 and the sixth capacitor C6 respectively, and the other end of the fourth capacitor C4 is connected to the second node P2 and the fifth capacitor C5 respectively; One end of the sixth capacitor C6 is grounded, and the other end of the sixth capacitor C6 is connected to the input terminal of the first amplifier U1 and the second node P2 respectively. One end of the fifth capacitor C5 is grounded, and the other end of the fifth capacitor C5 is connected to the input terminal of the second amplifier U2 and the second node P2 respectively.

9. The dual-channel push-pull output amplifier circuit as described in claim 8, characterized in that, The frequency selection module also includes a seventh capacitor C7, an eighth capacitor C8, a ninth resistor R9, and a tenth resistor R10; The first input terminal of the first amplifier U1 is connected to the third capacitor C3, the second node P2 and the sixth capacitor C6 respectively. The second input terminal of the first amplifier U1 is connected to the output terminal of the channel module and the ninth resistor R9 respectively. The other end of the ninth resistor R9 is connected to the second node P2 through the seventh capacitor C7. The first input terminal of the second amplifier U2 is connected to the fourth capacitor C4, the second node P2 and the fifth capacitor C5 respectively. The second input terminal of the second amplifier U2 is connected to the output terminal of another channel module and the tenth resistor R10 respectively. The other end of the tenth resistor R10 is connected to the second node P2 through the eighth capacitor C8.

10. An electronic device, characterized in that, The electronic device includes a dual-channel push-pull output amplifier circuit as described in any one of claims 1-9.

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