Power amplifier pickup lamp circuit system based on Flyback power supply driving

Abstract

The utility model relates to the technical field of power amplifier pickup lamps, in particular to a power amplifier pickup lamp circuit system driven by a Flyback power supply, which comprises a flyback switching power supply circuit, a DC-DC (direct current-direct current) circuit, a Bluetooth power amplifier circuit and a pickup lamp circuit, the flyback switching power supply circuit is electrically connected with the pickup lamp circuit through the DC-DC circuit, and the Bluetooth power amplifier circuit is electrically connected with the pickup lamp circuit through the Bluetooth power amplifier circuit. The flyback switching power supply circuit is electrically connected with the Bluetooth power amplifier circuit; the flyback switching power supply circuit comprises a switching power supply chip, a driving switch tube Q1, an RCD peak absorption circuit, a secondary RC absorption circuit and a switching power supply transformer T1, the switching power supply chip is electrically connected with the driving switch tube through a driving resistor, and a collector electrode of the driving switch tube is connected with the RCD peak absorption circuit. And the RCD peak absorption circuit and the secondary RC absorption circuit are electrically connected with the switching power supply transformer respectively. According to the utility model, a high-voltage input part and a low-voltage output part of a circuit system can be effectively isolated, voltage peak energy can be effectively absorbed, and comprehensive overload, short circuit and overcurrent protection functions can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of power amplifier pickup lamps, and in particular to a power amplifier pickup lamp circuit system driven by a Flyback power supply. Background Art

[0002] Sound pickup lights are lights that change color and pattern according to the rhythm and intensity of sound. They can not only add interest and decorate a space, but also create dynamic visual effects based on the rhythm and intensity of the music. Sound pickup lights have a wide range of applications, including industrial, commercial, domestic, and entertainment. As people's living standards continue to improve, integrated audio amplifiers and sound pickup lights have emerged. However, the power supply circuit of an amplifier sound pickup light often affects its overall acoustic performance. Currently, some power supply circuits pose safety risks and lack comprehensive overload, short-circuit, and overcurrent protection. Summary of the Invention

[0003] In order to solve the technical problems existing in the prior art, the utility model provides a power amplifier pickup lamp circuit system based on Flyback power drive, which can effectively isolate the high-voltage input part from the low-voltage output part, and can realize comprehensive overload, short circuit and overcurrent protection functions.

[0004] The utility model adopts the following technical solutions to achieve:

[0005] A flyback power-driven amplifier and sound pickup light circuit system, characterized by comprising: a flyback switching power supply circuit, a DC-DC circuit, a Bluetooth power amplifier circuit, and a sound pickup light circuit, wherein the flyback switching power supply circuit is electrically connected to the sound pickup light circuit via the DC-DC circuit, and the flyback switching power supply circuit is electrically connected to the Bluetooth power amplifier circuit;

[0006] The flyback switching power supply circuit includes a switching power supply chip, a driving switch tube Q1, an RCD peak absorption circuit, a secondary RC absorption circuit and a switching power supply transformer T1. The switching power supply chip is electrically connected to the driving switch tube through a driving resistor, the collector of the driving switch tube is connected to the RCD peak absorption circuit, and the RCD peak absorption circuit and the secondary RC absorption circuit are respectively electrically connected to the switching power supply transformer.

[0007] Specifically, the model of the switching power supply chip is KP201CSGA, and the model of the switching power supply transformer T1 is PQ2620.

[0008] Specifically, the base of the driving switch tube Q1 is connected to pin 8 of the switching power supply chip through a resistor R9 and a reverse-connected diode D7, one end of the resistor R13 is connected to pin 8 of the switching power supply chip, and the other end of the resistor R13 is connected to the base of the driving switch tube Q1; its emitter is connected to pin 4 of the switching power supply chip through a resistor R19, and pin 4 of the switching power supply chip is grounded through a capacitor C12; a resistor R17 is connected across the emitter electrode and the base.

[0009] Specifically, the RCD peak absorption circuit includes a resistor R5, a resistor R6, a resistor R7, a capacitor C2 and a rectifier diode D2. The resistor R5 is connected in parallel with the resistor R6, and the cathode of the rectifier diode D2 is electrically connected to one end of the resistor R5, the resistor R6 and the resistor R7 respectively. The anode of the rectifier diode D2 is electrically connected to the collector of the driving switch tube Q1 and the pin 4 of the switching power transformer T1 respectively; the other end of the resistor R7 is electrically connected to the pin 6 of the switching power transformer T1 through the capacitor C2, and the other ends of the resistor R5, the resistor R6, and the resistor R7 are all electrically connected to the pin 6 of the switching power transformer T1.

[0010] Specifically, the secondary RC absorption circuit includes a resistor R24, a resistor R26 and a capacitor C7, the resistor R24 and the resistor R26 are connected in parallel, one end of the resistor R26 is electrically connected to the A1 pin of the switching power transformer T1, and the other end of the resistor R26 is electrically connected to the cathode of the diode through the capacitor C7, and the cathode of the diode is electrically connected to the A1 pin of the switching power transformer T1.

[0011] Specifically, the DC-DC circuit includes an integrated voltage regulator chip XL4003 and an integrated voltage regulator chip AMS1117, and the integrated voltage regulator chip XL4003 and the integrated voltage regulator chip AMS1117-3V3 are electrically connected; the pickup lamp circuit includes a voice microphone, a sound processing circuit, a control chip STM32F103C8T6 and an RGB light strip, and the voice microphone is electrically connected to the control chip STM32F103C8T6 through the sound processing circuit; the integrated voltage regulator chip AMS1117-3V3 is electrically connected to the control chip STM32F103C8T6, and the control chip STM32F103C8T6 and the integrated voltage regulator chip XL4003 are electrically connected to the RGB light strip respectively.

[0012] Specifically, the Bluetooth power amplifier circuit includes a main power amplifier circuit, a dual-channel circuit, a bass circuit and a Bluetooth receiving circuit. The main power amplifier circuit is electrically connected to the dual-channel circuit, the bass circuit and the Bluetooth receiving circuit respectively; the main power amplifier circuit includes a digital power amplifier chip TPA3116 and a main power amplifier power-on mute circuit. The MUTE pin of the digital power amplifier chip TPA3116 is connected to the main power amplifier power-on mute circuit. The dual-channel circuit and the bass circuit both include the NE5532PS dual operational amplifier chip.

[0013] Specifically, the main power amplifier startup mute circuit includes capacitor C1, capacitor C2 and a mute resistor. One end of capacitor C1 is connected to the MUTE pin of the digital power amplifier chip TPA3116, and the other end of capacitor C1 is respectively connected to one end of capacitor C2 and one end of the mute resistor. The other end of the mute resistor is grounded GND, and the other end of capacitor C2 is connected to the power supply VCC.

[0014] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0015] This utility model provides a flyback-powered amplifier and sound pickup light circuit system, comprising a flyback switching power supply circuit, a DC-DC circuit, a Bluetooth amplifier circuit, and a sound pickup light circuit. The flyback switching power supply circuit utilizes a 24V / 2A flyback switching power supply solution, ensuring efficient operation of the power supply system. An isolation circuit effectively isolates the high-voltage input from the low-voltage output, effectively absorbing high voltage spike energy and preventing the switching transistor from being broken down by peak voltage, thus achieving comprehensive overload, short-circuit, and overcurrent protection. The Bluetooth amplifier circuit is equipped with a high-performance TPA3116 amplifier chip, offering excellent audio processing capabilities and low distortion. The main amplifier power-on mute circuit effectively eliminates the popping sound produced during startup. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of a power amplifier pickup lamp circuit system based on Flyback power drive in an embodiment of the utility model;

[0017] Figure 2 This is a partial structural diagram of a flyback switching power supply circuit in an embodiment of the present utility model;

[0018] Figure 3 This is a schematic diagram of the specific structure of the flyback switching power supply circuit in the embodiment of the present utility model;

[0019] Figure 4 This is a schematic diagram of the main power amplifier circuit in an embodiment of the present utility model. DETAILED DESCRIPTION

[0020] The following is a detailed description of the technical solution of the present invention in conjunction with the accompanying drawings and embodiments. It is obvious that the embodiments described are only some of the embodiments of the present invention, not all of them, and the implementation of the present invention is not limited to them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] Example 1

[0022] like Figure 1 As shown, the power amplifier and pickup light circuit system based on Flyback power supply drive described in the utility model includes: a flyback switching power supply circuit, a DC-DC circuit, a Bluetooth power amplifier circuit and a pickup light circuit. The flyback switching power supply circuit is electrically connected to the pickup light circuit through the DC-DC circuit, and the flyback switching power supply circuit is electrically connected to the Bluetooth power amplifier circuit.

[0023] like Figure 2 As shown in the figure, a partial structural diagram of a flyback switching power supply circuit is shown. The flyback switching power supply circuit includes a switching power supply chip, a driving switch tube Q1, an RCD peak absorption circuit, a secondary RC absorption circuit and a switching power supply transformer T1. The switching power supply chip is electrically connected to the driving switch tube through a driving resistor, and the collector of the driving switch tube is connected to the RCD peak absorption circuit. The RCD peak absorption circuit and the secondary RC absorption circuit are respectively electrically connected to the switching power supply transformer.

[0024] The switching power supply chip is KP201CSGA, and the switching power transformer T1 is PQ2620. The KP201CSGA is used as the PWM generator chip to drive the switching transistor. The resistors and capacitors connected in parallel around the chip's RT pin can change the overall circuit switching frequency. The driving switching transistor uses an SVF10N65F N-channel enhancement-mode MOS field-effect transistor, which outputs a 24V voltage to the DC-DC voltage regulator circuit and Class D amplifier circuit.

[0025] like Figure 3 As shown in the figure, a schematic diagram of the specific structure of the flyback switching power supply circuit is shown. In this embodiment, the base of the driving switch tube Q1 is connected to pin 8 of the switching power supply chip through a resistor R9 and a reverse-connected diode D7. One end of the resistor R13 is connected to pin 8 of the switching power supply chip, and the other end of the resistor R13 is connected to the base of the driving switch tube Q1; its emitter is connected to pin 4 of the switching power supply chip through a resistor R19, and pin 4 of the switching power supply chip is grounded through a capacitor C12; a resistor R17 is connected across the emitter electrode and the base.

[0026] Specifically, the RCD peak absorption circuit includes a resistor R5, a resistor R6, a resistor R7, a capacitor C2 and a rectifier diode D2. The resistor R5 is connected in parallel with the resistor R6. The cathode of the rectifier diode D2 is electrically connected to one end of the resistor R5, the resistor R6 and the resistor R7 respectively. The anode of the rectifier diode D2 is electrically connected to the collector of the driving switch tube Q1 and the pin 4 of the switching power transformer T1 respectively; the other end of the resistor R7 is electrically connected to the pin 6 of the switching power transformer T1 through the capacitor C2, and the other ends of the resistor R5, the resistor R6 and the resistor R7 are all electrically connected to the pin 6 of the switching power transformer T1.

[0027] Specifically, the secondary RC absorption circuit includes a resistor R24, a resistor R26 and a capacitor C7, the resistor R24 and the resistor R26 are connected in parallel, one end of the resistor R26 is electrically connected to the A1 pin of the switching power transformer T1, and the other end of the resistor R26 is electrically connected to the cathode of the diode through the capacitor C7, and the cathode of the diode is electrically connected to the A1 pin of the switching power transformer T1.

[0028] The RCD spike absorption circuit and secondary RC absorption circuit can effectively absorb high voltage spike energy, preventing the switching tube from being broken down by the peak voltage, and providing comprehensive overload, short circuit, and overcurrent protection. If the spike absorption circuit fails, the switching tube will be subjected to high voltage, which can seriously burn out the switching tube.

[0029] like Figure 3 The figure shows the detailed structure of a flyback switching power supply circuit. The input voltage is 90V-264V AC. The pre-stage input passes through an EMI filter circuit. The common-mode current in the input line is bypassed to ground via the common-mode inductor. The common-mode inductor presents a balanced impedance, with equal impedance in the power line and ground line. This impedance exhibits an impedance characteristic to common-mode noise. The common-mode filter eliminates the "switching interference" characteristic of switching power supplies, ensuring that the device itself and other devices on the power grid are free from interference. Fuse F1 protects the circuit when excessive current occurs. Discharge resistors R3 and R8 discharge this portion of the filter, distributing the power dissipated by multiple resistors. Safety capacitor CX1 filters differential-mode interference, specifically at both ends of the input. Common-mode inductors L1 and L2 attenuate common-mode current. Varistor VR1 protects against high voltage from lightning strikes. Rectifier bridge BD1 rectifies the AC power into a 310V pulsating DC voltage, which is then charged and filtered by capacitor C3 to produce a relatively pure DC voltage. If the capacitance of C3 is reduced, the output AC ripple will increase. R4 and R9 are the startup resistors for the KP201CSGA chip. A high-power 1206 chip with a 19V-21.5V input voltage is used to start the chip. The flyback transformer's auxiliary winding provides a 15V operating voltage for the chip. C20 is the chip's switching frequency setting capacitor. The chip stably outputs a 0.45 duty cycle PWM square wave to drive the Q1 NMOS switch on and off. R19 and C12 are blanking circuits that filter out the current spike caused by the inductor's parasitic capacitance at the moment the MOS transistor turns on. The spike duration is generally between 200µS and 300µS. R15 and R14 are current sense resistors that feed the current signal back to the chip's current sense terminal. R13 is the MOS transistor drive resistor to eliminate oscillations. D7 and R11 are the MOS transistor's fast shutdown circuit. R17 is an anti-static resistor.

[0030] R5, R6, C2, and rectifier diode D2 form an RCD spike absorption circuit. This circuit may experience two oscillations. The first is primarily caused by the primary leakage inductance Lkp and the capacitance of the MOS tube Coss. The second is primarily caused by the oscillation of the excitation inductance and the Coss capacitance after the circuit energy is exhausted. After adding the RCD absorption circuit, when the voltage across the MOS is greater than the sum of the clamping capacitor voltage and the input voltage, the clamping diode conducts, the clamping circuit begins to operate, and the secondary rectifier diode D1 performs rectification. R26, R24, and C7 serve as the secondary RC absorption circuit. When the diode is cut off, due to the certain leakage inductance on the secondary side of the transformer, the energy in it will produce LC oscillation with the junction capacitance of the diode, resulting in a certain spike voltage when the diode is turned off. The RC circuit absorbs the spike voltage.

[0031] The feedback circuit uses PC817 and TL431 to form a voltage feedback circuit. The setting can make R29, R1 and R32 have a voltage of 2.5V after voltage division when the output is 24V. When the output voltage is greater than 24V, the voltage at the R terminal is greater than 2.5V, the output voltage of the internal error amplifier of TL431 increases, the conduction degree of the internal transistor increases, that is, the voltage from the K terminal to the A terminal increases, the current flowing through the optocoupler transistor increases, the diode illumination increases, the secondary transistor current Ic increases, and the chip FB terminal voltage increases.

[0032] Specifically, the DC-DC circuit includes an integrated voltage regulator chip XL4003 and an integrated voltage regulator chip AMS1117, which are electrically connected. The DC-DC circuit uses the XL4003 integrated voltage regulator chip. Changing the voltage at the chip's voltage feedback terminal adjusts the output voltage. With an input voltage of 5-32V, the output voltage is adjustable from 0.8-30V. The adjusted output voltage is a stable 5V output, powering the RGB light strip and the integrated voltage regulator chip AMS1117. The integrated voltage regulator chip AMS1117-3V3 then stabilizes the output voltage to 3.3V, which powers the STM32F103C8T6 chip in the sound pickup light circuit.

[0033] The audio pickup light circuit includes a voice microphone, a sound processing circuit, an STM32F103C8T6 control chip, and an RGB light strip. The voice microphone is electrically connected to the STM32F103C8T6 control chip via the sound processing circuit. The integrated voltage regulator chip AMS1117-3V3 is also electrically connected to the STM32F103C8T6 control chip. The STM32F103C8T6 control chip and the integrated voltage regulator chip XL4003 are each electrically connected to the RGB light strip. The audio pickup light circuit primarily receives audio through the voice microphone, which is amplified by the sound processing circuit and then read by the chip's ADC to control the voltage of the RGB light strip. The ADC reads the input value based on the STM32F103C8T6 control chip, which controls the voltage of the RGB light strip. The RGB light strip includes multiple WS2812 LEDs, which control the color and pattern of the WS2812 LEDs. External touch buttons can also be used to control the RGB light strip's drive and display, providing flexible and diverse audio pickup lighting effects.

[0034] Specifically, the Bluetooth power amplifier circuit includes a main power amplifier circuit, a dual-channel circuit, a bass circuit and a Bluetooth receiving circuit. The main power amplifier circuit is electrically connected to the dual-channel circuit, the bass circuit and the Bluetooth receiving circuit respectively; the main power amplifier circuit includes a digital power amplifier chip TPA3116 and a main power amplifier power-on mute circuit. The MUTE pin of the digital power amplifier chip TPA3116 is connected to the main power amplifier power-on mute circuit. The dual-channel circuit and the bass circuit both include the NE5532PS dual operational amplifier chip.

[0035] like Figure 4 As shown in the main power amplifier circuit diagram, the main power amplifier startup mute circuit includes capacitor C1, capacitor C2 and a mute resistor. One end of capacitor C1 is connected to the MUTE pin of the digital power amplifier chip TPA3116, and the other end of capacitor C1 is connected to one end of capacitor C2 and one end of the mute resistor respectively. The other end of the mute resistor is grounded GND, and the other end of capacitor C2 is connected to the power supply VCC.

[0036] In this embodiment, the Bluetooth power amplifier circuit uses the AC6955F Bluetooth audio chip as the Bluetooth audio input processing chip. The audio input is sent to the LM5532 operational amplifier for low-pass and high-pass filtering, and the processed audio is sent to the amplifier chip for audio output. The audio amplification uses two chips, one for dual-channel output and one for bass output, and the speaker box is made to make the sound quality more rich.

[0037] The main amplifier circuit controls the output volume level to adapt to different audio devices and input signal strengths. In this embodiment, the main amplifier circuit uses the TPA3116 digital amplifier chip, modified primarily based on the example circuit in the datasheet. By adjusting the capacitors and resistors at pins 7, 8, and 9 to adjust the gain, the output volume level can be controlled to adapt to different audio devices and input signal strengths. A common-mode inductor is used for low-pass filtering at the output. Together with the output capacitor, this inductor forms an LC filter to suppress high-frequency and switching noise. The inductor's impedance increases with frequency, blocking high-frequency noise while allowing the audio signal (lower frequencies) to pass unimpeded to the speakers. By filtering out high-frequency noise, the inductor helps reduce the system's electromagnetic interference (EMI) emissions and improve overall electromagnetic compatibility. The AM0, AM1, and AM2 pins set the switching frequency, ensuring the amplifier complies with regional EMC standards and avoids interference with AM broadcasts or other wireless communications.

[0038] The main amplifier has a power-on mute circuit. Adding this circuit can significantly reduce the popping sound that occurs during startup. The TPA3116 digital amplifier chip's MUTE pin is a mute control pin, active high. Two 1uF ceramic capacitors, C32 and C25, are connected to the MUTE pin and connected to GND via 100kΩ resistors, R7 and R31. When VCC is first applied, the voltage across capacitors C32 and C25 (1uF) is 0V, initially short-circuiting. VCC, through R7 and R31, generates a high voltage across the MUTE pin, muting the TPA3116. As C32 and C25 gradually charge, the voltage across them increases until it reaches VCC. At this point, R7 and R31 pull the MUTE pin down to GND, releasing the TPA3116 from mute mode and allowing normal power amplification. Music playback is now possible.

[0039] The preamplifier's dual-channel circuit utilizes the NE5532 dual operational chip. This circuit design employs the dual NE5532N operational amplifier chip, comprising two independent operational amplifier units. The first stage of the circuit, U4.1, forms a voltage follower. Its function is to pass the input audio signal, L1, to its output without distortion or gain. An RC filter network consisting of resistor R7 and capacitor C10 further filters out high-frequency noise from the input signal. The signal from U4.1's output is then fed into the input of U4.2. U4.2 acts as a gain amplifier, its gain calculated by the proportional relationship between resistors R13 and R24. Meanwhile, another RC filter formed by R13 and C29 ensures that the signal entering U4.2 is also subject to noise suppression. The same principle applies to the right-channel circuit.

[0040] The bass circuit utilizes the NE5532PS dual operational amplifier chip to create a composite audio processing circuit, integrating noise suppression and signal amplification. Op amp U6.1 forms a first-stage active low-pass filter. Resistor R2 and capacitor C73 form an RC network, determining the filter's cutoff frequency. This filter primarily eliminates unwanted high-frequency noise and pre-processes the input signal. This stage also performs a preliminary voltage gain adjustment, though this gain is primarily determined by the op amp's own open-loop gain. After the first stage of filtering, the signal passes through resistor R33 and then, together with capacitor C74, forms a second-stage low-pass filter, further filtering out higher-frequency noise and ensuring a smoother and more stable output signal. Op amp U6.2 primarily serves as a signal follower and may also adjust gain. The specific voltage gain is determined by the voltage divider ratio between resistors R34 and R35. When R34 is greater than R35 and the gain is less than 1, the output signal is attenuated rather than amplified. The circuit acts as a buffer and filter, while also reducing the input signal's amplitude. The gain formula is R35 / R34. This circuit combines a two-stage low-pass filter with an adjustable-gain amplifier, suitable for preprocessing and amplifying audio signals. It effectively improves signal quality and optimizes performance by adjusting the resistance and capacitance parameters of each stage according to the application scenario. Furthermore, by using the classic NE5532PS audio-specific op amp chip, it offers low noise, wide-band response, and excellent linearity, making it ideal for high-quality audio signal processing.

[0041] The Bluetooth receiver circuit receives audio from the onboard Bluetooth antenna or other audio receiving circuits, such as AUX, Bluetooth, USB-DAC, USB flash drives, and TF cards. The Bluetooth chip AC6955 receives audio through the onboard Bluetooth antenna. The built-in program sends the audio to the NE5532 circuit for processing. The AC6955F also supports peripheral circuits, such as AUX, Bluetooth, USB-DAC, USB flash drives, and TF cards. The AC6955F also features key controls, which read the ADC value on the KEY pin and use resistor voltage divider to read the ADC value. Key functions include volume increase and decrease, track skipping, audio pause and play, and playback mode switching. The chip reads the most recently connected device and reads audio files. The chip operates between 2.2V and 5.5V and is powered by an LM7805 voltage regulator. A Type-C port allows for internal program updates, data reading from SD cards and USB flash drives, and song downloads. The AC6955F also features a voice microphone, which allows for incoming call notifications and can receive voice signals sent to mobile devices.

[0042] In summary, this embodiment of a flyback-powered amplifier and light pickup circuit system utilizes a flyback switching power supply and a TPA3116 amplifier circuit, along with an STM32-based driver for the RGB light pickup circuit. The flyback switching power supply circuit utilizes a high-performance KP201CSGA chip as a PWM controller, along with an SVF10N65F N-channel enhancement-mode field-effect transistor and a PC40 ferrite core to create an efficient flyback transformer. Furthermore, a 10L150C Schottky rectifier, a PC817 feedback optocoupler, and a TL431 voltage reference provide comprehensive overload, short-circuit, and overcurrent protection. An isolation circuit effectively isolates the high-voltage input from the low-voltage output, eliminating potential safety hazards at the source. The power amplifier circuit utilizes a TPA3116 Class-D amplifier chip paired with an LM5532 operational amplifier to achieve high-fidelity audio amplification. The power input uses an HF46F-24V relay with an NTC buffer resistor to effectively prevent relay contact sticking. For audio reception, it utilizes the AC6955F Bluetooth chip, supporting multiple audio interfaces and reception functions, including a 3.5mm headphone jack, TF card reader, USB-Type-C reader, USB3.1 reader, USB-ADC reader, and Bluetooth 5.1G audio reception. The sound pickup light circuit utilizes the STM32F103C8T6 chip, providing flexible and diverse sound pickup lighting effects.

[0043] The above embodiments are preferred implementation methods of the present invention, but the implementation methods of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A power amplifier pickup lamp circuit system based on Flyback power drive, characterized in that: include: A flyback switching power supply circuit, a DC-DC circuit, a Bluetooth power amplifier circuit, and a pickup light circuit, wherein the flyback switching power supply circuit is electrically connected to the pickup light circuit via the DC-DC circuit, and the flyback switching power supply circuit is electrically connected to the Bluetooth power amplifier circuit; The flyback switching power supply circuit includes a switching power supply chip, a driving switch tube Q1, an RCD peak absorption circuit, a secondary RC absorption circuit and a switching power supply transformer T1. The switching power supply chip is electrically connected to the driving switch tube Q1 through a driving resistor, and the collector of the driving switch tube Q1 is connected to the RCD peak absorption circuit. The RCD peak absorption circuit and the secondary RC absorption circuit are respectively electrically connected to the switching power supply transformer T1. The driving switch tube Q1 has its base connected to pin 8 of the switching power supply chip through a resistor R9 and a reverse-connected diode D7, one end of a resistor R13 is connected to pin 8 of the switching power supply chip, and the other end of the resistor R13 is connected to the base of the driving switch tube Q1; its emitter is connected to pin 4 of the switching power supply chip through a resistor R19, and pin 4 of the switching power supply chip is grounded through a capacitor C12; a resistor R17 is connected between the emitter and the base; The RCD peak absorption circuit includes a resistor R5, a resistor R6, a resistor R7, a capacitor C2 and a rectifier diode D2. The resistor R5 is connected in parallel with the resistor R6. The cathode of the rectifier diode D2 is electrically connected to one end of the resistor R5, the resistor R6 and the resistor R7 respectively. The anode of the rectifier diode D2 is electrically connected to the collector of the driving switch tube Q1 and the pin 4 of the switching power transformer T1 respectively; the other end of the resistor R7 is electrically connected to the pin 6 of the switching power transformer T1 through the capacitor C2, and the other ends of the resistor R5, the resistor R6 and the resistor R7 are all electrically connected to the pin 6 of the switching power transformer T1; The secondary RC absorption circuit includes a resistor R24, a resistor R26 and a capacitor C7. The resistor R24 and the resistor R26 are connected in parallel. One end of the resistor R26 is electrically connected to the A1 pin of the switching power transformer T1. The other end of the resistor R26 is electrically connected to the cathode of the diode through the capacitor C7. The cathode of the diode is electrically connected to the A1 pin of the switching power transformer T1.

2. The power amplifier pickup lamp circuit system based on Flyback power drive according to claim 1, characterized in that: The model of the switching power supply chip is KP201CSGA, and the model of the switching power supply transformer T1 is PQ2620.

3. The power amplifier pickup lamp circuit system based on Flyback power drive according to claim 1, characterized in that: The DC-DC circuit includes an integrated voltage regulator chip XL4003 and an integrated voltage regulator chip AMS1117, and the integrated voltage regulator chip XL4003 and the integrated voltage regulator chip AMS1117-3V3 are electrically connected; the pickup lamp circuit includes a voice microphone, a sound processing circuit, a control chip STM32F103C8T6 and an RGB light strip, and the voice microphone is electrically connected to the control chip STM32F103C8T6 through the sound processing circuit; the integrated voltage regulator chip AMS1117-3V3 is electrically connected to the control chip STM32F103C8T6, and the control chip STM32F103C8T6 and the integrated voltage regulator chip XL4003 are electrically connected to the RGB light strip respectively.

4. The power amplifier pickup lamp circuit system based on Flyback power drive according to claim 1, characterized in that: The Bluetooth power amplifier circuit includes a main power amplifier circuit, a dual-channel circuit, a bass circuit and a Bluetooth receiving circuit. The main power amplifier circuit is electrically connected to the dual-channel circuit, the bass circuit and the Bluetooth receiving circuit respectively; the main power amplifier circuit includes a digital power amplifier chip TPA3116 and a main power amplifier power-on mute circuit. The MUTE pin of the digital power amplifier chip TPA3116 is connected to the main power amplifier power-on mute circuit. The dual-channel circuit and the bass circuit both include a NE5532PS dual operational amplifier chip.

5. The power amplifier pickup lamp circuit system based on Flyback power drive according to claim 4, characterized in that: The main power amplifier startup mute circuit includes capacitor C1, capacitor C2 and a mute resistor. One end of capacitor C1 is connected to the MUTE pin of the digital power amplifier chip TPA3116, and the other end of capacitor C1 is respectively connected to one end of capacitor C2 and one end of the mute resistor. The other end of the mute resistor is grounded GND, and the other end of capacitor C2 is connected to the power supply VCC.

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