A rechargeable intelligent sound response power management system

Abstract

The application relates to a chargeable intelligent sound response power management system which amplifies audio signals received from outside and plays them out through loudspeakers. The charging circuit is used for charging the battery pack module, the switch circuit is used for turning on or off the power supply of the intelligent sound response, the voltage of the battery pack module is boosted by the boost circuit and output to the power amplifier, and the signal sampling feedback circuit is used for collecting the power signals of the power amplifier in real time. The single-chip microcomputer circuit outputs the PWM signal to the charging circuit according to the current size of the power input interface, is used for adjusting the current size of the charging current, controls the charging time of the battery pack module, and controls the output voltage of the boost circuit according to the collected real-time power signals, so that the output voltage changes in real time along with the change of the power amplifier. The power management system provided by the application considers both the working efficiency of the battery pack module and the music playing effect of the loudspeaker.

Description

Technical Field

[0001] The embodiments of the present invention relate to the fields of smart speakers, mobile phones, smart homes and electronic information, and particularly to a power management system for smart speakers powered by batteries such as lithium batteries, dry batteries and lead-acid batteries. Background Technology

[0002] Currently, in the fields of smart speakers, mobile phones, and smart homes, with the rapid development of the Internet of Things (IoT), Bluetooth technology in smartphones, Wi-Fi technology, and artificial intelligence, outdoor sports, mobile communication, and intelligent voice-controlled portable electronic devices are developing rapidly. People's demand for portable devices is increasing, and these portable electronic devices inevitably require a battery power supply system composed of batteries and DC power boost management. Due to technological and process limitations, the capacity of existing lithium batteries cannot be infinitely large. However, outdoor portable smart speakers, smartphones, IoT terminals, and other electronic products require relatively large battery capacities to ensure long operating times. Given a fixed battery capacity, the only effective way to extend the product's operating time is to improve the efficiency of battery discharge power management.

[0003] like Figure 1 The diagram shows the power management system of a traditional portable smart speaker, which includes a power input interface 1, a charging circuit 2, a battery module 3, a switching circuit 4, a boost circuit 5, a power amplifier 6, a control circuit 7, an audio input circuit 8, and a speaker 9. The charging circuit 2 receives external power from the power input interface 1 and charges the battery module 3. The boost circuit 5 boosts the voltage of the battery module 3 to the voltage required by the power supply system. The switching circuit 4 switches the power supply on and off. The control circuit 7 controls the discharge current limiting and short-circuit protection of the battery module 3, as well as the switching circuit 4. The power amplifier 6 receives the high voltage output from the boost circuit 5 and converts it into the power required by the speaker 9, enabling the speaker 9 to operate normally. The audio input circuit 8 outputs audio signals to the power amplifier 6 for playback by the speaker 9.

[0004] Traditional smart speaker power management designs involve boosting the current to a fixed, relatively high voltage value via a boost circuit 5 to ensure sufficient power output from the power amplifier 6 and adequate driving power for the speaker 9. However, music signals are dynamic. When the music signal is strong, the power amplifier 6 requires a higher voltage, which the boost circuit 5 outputs to match. Conversely, when the music signal is weak, the power amplifier 6 requires a lower voltage, but the boost circuit 5 still outputs a higher voltage, resulting in a mismatch. Consequently, a significant voltage difference exists between the battery module 3 and the boost circuit 5 output voltage. This reduces the efficiency of the boost circuit 5, causing most of the energy from the battery module 3 to be lost as heat.

[0005] In summary, the power amplifier 6 in traditional smart speaker power management systems maintains a high, constant voltage value in the boost circuit 5 regardless of whether the amplifier is operating at high or low power, resulting in low efficiency and shortened battery life. Furthermore, this design fails to guarantee low distortion, high dynamic range, and high power operation, nor does it extend battery life, thus failing to meet current user needs. Summary of the Invention

[0006] To address the aforementioned issues, this invention proposes a rechargeable smart speaker power management system, which can resolve the problems of low distortion in existing speakers and the inability of battery packs to improve working efficiency.

[0007] To address the problems mentioned above, the embodiments of the present invention provide the following technical solutions:

[0008] A rechargeable smart speaker power management system is provided for supplying power to the smart speaker, amplifying externally received audio signals, and playing them out through a speaker. It includes a power input interface, a charging circuit, a battery module, a switching circuit, a boost circuit, and a power amplifier. The charging circuit receives external power through the power input interface to charge the battery module. The switching circuit is used to turn the power supply to the smart speaker on or off. The boost circuit boosts the voltage of the battery module and outputs it to the power amplifier. The rechargeable smart speaker power management system further includes:

[0009] A signal sampling feedback circuit, connected to the power amplifier, is used to acquire the power signal of the power amplifier in real time; and

[0010] The microcontroller circuit is connected to the charging circuit, the switching circuit, the boost circuit, and the signal sampling feedback circuit.

[0011] The microcontroller circuit is a microcontroller chip with multiple pins. It outputs a PWM (Pulse Width Modulation) signal to the charging circuit according to the current of the power input interface to adjust the charging current and control the charging time of the battery pack module. At the same time, it controls the output voltage of the boost circuit according to the real-time power signal collected by the signal sampling feedback circuit, so that it changes in real time with the change of the power amplifier.

[0012] Furthermore, it also includes an audio circuit connected to the power amplifier for inputting external audio signals.

[0013] Furthermore, it also includes a switch button circuit, which is connected to the microcontroller circuit and is used to output user power on / off commands.

[0014] Furthermore, the microcontroller circuit is connected to the power amplifier. When the switch button circuit outputs a power on / off signal, the microcontroller circuit outputs a mute signal to the power amplifier, which then shuts off instantly to avoid interference from power on / off noise.

[0015] Furthermore, the charging circuit includes two first MOS transistors, forming a pulse width modulation switching circuit, whose gates are respectively connected to the pulse width modulation signal pin of the microcontroller chip, for receiving the PWM signal output by the microcontroller chip, thereby adjusting the duty cycle of the output voltage.

[0016] Furthermore, it also includes:

[0017] Two voltage divider resistors are used to divide the input power supply into a suitable voltage value;

[0018] A current-limiting resistor is connected to the common terminal of the two voltage divider resistors and the external power current sensing pin of the microcontroller chip; and

[0019] A current-limiting capacitor, connected in parallel with one of the voltage-dividing resistors, is used to provide a stable reference voltage.

[0020] Furthermore, the switching circuit includes:

[0021] The transistor's base is connected to the switch control pin of the microcontroller chip to receive on / off signals, and its emitter is grounded; and

[0022] The second MOSFET has its gate connected to the collector of the transistor, its input terminal connected to the battery module, and its output terminal used to output a switch control signal.

[0023] Furthermore, the boost circuit includes a boost chip with multiple pins, wherein the boost signal pin of the boost chip is connected to the power amplifier for outputting a boosted voltage signal; the I2C or UART pin of the boost chip is connected to the corresponding I2C or UART pin of the microcontroller chip for adjusting the boost magnitude according to the boost control signal of the microcontroller chip; and the boost chip is also connected to the output terminal of the second MOS transistor for receiving the switching control signal.

[0024] Furthermore, the power amplifier includes:

[0025] A power amplifier chip with multiple pins includes an audio input pin connected to the audio circuit for receiving external audio signals; a mute signal pin connected to the mute signal pin of a microcontroller chip for receiving the mute signal; an I2C or UART pin connected to the I2C or UART pin of the microcontroller chip for communication between the two; and a boost signal pin connected to the boost signal pin of a boost converter chip for receiving the boosted voltage signal.

[0026] An LC filter circuit, connected across the two power amplifier signal output pins of the power amplifier chip, is used to filter out the amplified high-frequency carrier and detect the useful audio signal for the speaker. It includes two inductors, two capacitors, and two resistors. One inductor, resistor, and capacitor are connected in series between one power amplifier signal output pin of the power amplifier chip and ground, and the other inductor, resistor, and capacitor are connected in series between the other power amplifier signal output pin of the power amplifier chip and ground.

[0027] Furthermore, the signal sampling feedback circuit includes:

[0028] A transformer has one primary coil and two secondary coils. The two ends of the primary coil are connected to the inductor in the LC filter circuit. The two secondary coils are connected together and their common terminal is grounded, and are also connected to the signal sampling feedback pin of the microcontroller chip.

[0029] Two detector rectifier diodes are provided, with their anodes connected to the two secondary windings of the transformer, and their cathodes connected to the signal sampling feedback pin of the microcontroller chip.

[0030] The power management system provided by this invention balances the charging efficiency of the battery module with the sound quality of the speaker playback. Due to the real-time changes in the music signal, the power signal collected by the signal sampling feedback circuit also changes in real time. The microcontroller circuit adjusts the output voltage of the boost circuit in real time based on the collected power signal, thereby adjusting the output power of the power amplifier to maximize the operating efficiency of the audio system. Simultaneously, the microcontroller circuit also determines whether the external power supply is overloaded based on the input current, and outputs a PWM signal to modulate the voltage duty cycle, thereby adjusting the charging current of the battery module. Attached Figure Description

[0031] To more clearly illustrate the solutions in this invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 For traditional portable smart speaker power management systems;

[0033] Figure 2 A module diagram of a rechargeable smart speaker power management system in an embodiment of the present invention;

[0034] Figure 3 A specific circuit diagram of a rechargeable smart speaker power management system is shown in this embodiment of the invention. Detailed Implementation

[0035] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention are described clearly and completely below. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0036] 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 the invention. 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.

[0037] This invention provides an intelligent speaker power management system, such as... Figure 2As shown, the circuit used to power the speaker 110, amplify and play externally received audio signals, includes a power input interface 101, a charging circuit 102, a battery pack module 103, a switching circuit 104, a boost circuit 105, a power amplifier 106, a microcontroller circuit 107, an audio circuit 108, a signal sampling feedback circuit 109, a speaker 110, and a switch button circuit 111.

[0038] The charging circuit 102 receives external power from the power input interface 101 to charge the battery module 103. The switching circuit 104 is connected to the battery module 103 and is used to turn the power supply of the entire smart speaker on or off. The boost circuit 105 is connected to the switching circuit 104 and, when the switching circuit 104 is turned on, boosts the voltage of the battery module 103. The power amplifier 106 is connected between the boost circuit 105 and the speaker 110, amplifying the received audio signal and playing it out through the speaker 110. The audio circuit 108 is connected to the power amplifier 106 and is used to input external audio signals. In this embodiment, the audio signal can be transmitted via Wi-Fi, Bluetooth, etc., and is not limited to these methods. The signal sampling feedback circuit 109 is connected to the power amplifier 106 and is used to collect the power signal of the power amplifier 106 in real time. The microcontroller circuit 107 is connected to the charging circuit 102, the switching circuit 104, the boost circuit 105, the power amplifier 106, and the signal sampling feedback circuit 109. Based on the real-time power signal fed back from the signal sampling feedback circuit 109, it adjusts the boost voltage of the boost circuit 105 in real time via UART or I2C communication, thereby adjusting the power output of the power amplifier 106 to match the volume of music played by the speaker 110. Simultaneously, the microcontroller circuit 107 determines whether the external power supply is overloaded based on the current magnitude of the power input interface 101. If an overload occurs, it outputs a PWM (Pulse Width Modulation) signal to the charging circuit 102 to adjust the charging current and control the charging time of the battery pack module 103; if no overload occurs, it maintains the original charging current. Meanwhile, the switch button circuit 111 is connected to the microcontroller circuit 107 and is used to input user switch commands. The microcontroller circuit 107 controls the switching circuit 104 to open or close based on the user switch commands. When the user presses the switch button circuit 111, the microcontroller circuit 107 will instantly output a mute signal to the power amplifier 106, causing the power amplifier 106 to be briefly turned off for 1-2 seconds to avoid noise from the power-on and power-off current.

[0039] The speaker 110 converts the received audio signal into a music electrical signal for playback, and the volume of the music signal changes in real time. Consequently, the actual power consumption of the power amplifier 106 also changes in real time. When the music played by the speaker 110 is loud, the power amplifier 106 requires a larger output power. In this case, the microcontroller circuit 107 detects an external power overload and adjusts the duty cycle of the output PWM waveform to reduce the charging current supplied by the charging circuit 102 to the battery module 103. Conversely, when the music played by the speaker 110 is soft, the power amplifier 106 requires a smaller output power. In this case, the microcontroller circuit 107 detects no external power overload and does not need to adjust the duty cycle of the output PWM waveform, so the charging circuit 102 maintains its original charging current.

[0040] The power management system provided in this embodiment takes into account both the charging efficiency of the battery module 103 and the music playback effect of the speaker 110. Due to the real-time changes in the music signal, the power signal collected by the signal sampling feedback circuit 109 also changes in real time. The microcontroller circuit 107 adjusts the output voltage of the boost circuit 105 in real time according to the collected power signal, thereby adjusting the output power of the power amplifier 106 to maximize the working efficiency of the audio system.

[0041] In this real-time mode, the entire audio system's on / off state is determined by the user. The user outputs a power-on / off signal to the microcontroller circuit 107 via the switch button circuit 111. When the microcontroller circuit 107 receives the power-on signal, it controls the switch circuit 104 to start working, allowing the audio system to play music normally. When the microcontroller circuit 107 receives the power-off signal, it controls the switch circuit 104 to turn off the power, so the audio system does not play music and only charges the battery module 103. In this real-time mode, the switch button circuit 111 is a switch. When this switch is pressed by the user, the system generates current noise during power-on and power-off. Therefore, the microcontroller circuit 107 outputs a mute signal to the power amplifier 106, causing the power amplifier 106 to briefly shut down for 1 to 2 seconds, preventing the harsh current noise from being played by the speaker 110.

[0042] Figure 3 This is a detailed circuit diagram of the rechargeable smart speaker power management system in this real-time mode. In this real-time mode, the microcontroller circuit 107 is a microcontroller chip U1 with multiple pins. The charging circuit 102 includes two first MOSFETs Q1 and Q2, multiple resistors R1, R2, R3, R4, R5, R6, R7, and R8, multiple capacitors C1, C2, and C3, a diode D1, and a first inductor L1.

[0043] In this circuit, first MOSFETs Q1 and Q2 form a pulse width modulation (PWM) switching circuit, with their gates connected to pins 1 and 2 of the microcontroller chip U1, respectively. Simultaneously, first MOSFET Q1 receives external power Vcc through power input interface 101. In this embodiment, pins 1 and 2 serve as the PWM signal pins of the microcontroller chip U1. Resistors R1 and R3 are connected in series between the common terminal of first MOSFETs Q1 and Q2 and pin 1 of the microcontroller chip U1. Resistor R2 is connected between the gate of first MOSFET Q2 and pin 2 of the microcontroller chip U1. Capacitor C1 is connected between the common terminal of first MOSFETs Q1 and Q2 and ground. In this real-time mode, resistors R1, R2, and R3 act as current limiters and voltage dividers. The microcontroller chip U1 outputs PWM signals through pins 1 and 2 to control the gates of first MOSFETs Q1 and Q2, thereby controlling the voltage duty cycle and thus the charging current. One end of the first inductor L1 is connected to the first MOSFET Q2, and the other end is connected to pin 7 of the microcontroller chip U1 through resistor R8. One end of resistor R4 is connected to pin 10 of the microcontroller chip U1. Resistor R7 and capacitor C2 are connected in series between the first MOSFET Q2 and the other end of resistor R4, and are also connected in parallel with the first diode D1, with the anode of the first diode D1 connected to resistor R4. Resistor R5 is connected between pin 10 of the microcontroller chip U1 and resistor R8, and resistor R6 is connected between pin 9 of the microcontroller chip U1 and the anode of the first diode D1, and is grounded. Resistors R4, R7, capacitor C2, first diode D1, and first inductor L1 constitute a filter and voltage regulator circuit.

[0044] In this real-time mode, the battery pack module 103 includes a battery pack B1. Resistor R5 is connected to the positive terminal of battery pack B1 to enable the microcontroller chip U1 to fine-tune the constant charging voltage. Capacitor C3 is connected in parallel with battery pack B1 for filtering during charging. Resistor R6 is used to adjust the output charging current.

[0045] Meanwhile, capacitor C4 is a filter capacitor connected between the external input power supply Vcc and ground to filter the input power supply Vcc and provide power to the microcontroller chip U1. The ground terminal of capacitor C4 is connected to pin 5 of the microcontroller chip U1. Resistors R9 and R10 are connected in series and in parallel with capacitor C4, and resistor R12 is also connected in parallel with capacitor C4. In this real-time mode, capacitor C4 is connected across pins 3 and 5 of the microcontroller chip U1, capacitor C5 is connected in parallel with resistor R10, and resistor R11 is connected between the common terminal of resistors R9 and R10 and pin 4 of the microcontroller chip U1. Resistors R9 and R10 form a voltage divider circuit, dividing the input power supply Vcc into a suitable voltage value, which is then supplied to the microcontroller chip U1 via current-limiting capacitor C5 and current-limiting resistor R11. After internal power supply regulation, a stable reference voltage is provided. In this real-time mode, the microcontroller chip U1 senses the current magnitude of the external power supply Vcc through pin 4, and outputs a PWM wave through pins 1 and 2. Therefore, pin 4 is used as the external power current sensing pin for the microcontroller chip U1.

[0046] Capacitor C6 is connected between pin 6 of microcontroller chip U1 and the negative terminal of battery pack B1, and is grounded; capacitor C7 is connected between pin 7 of microcontroller chip U1 and the negative terminal of battery pack B1, and is grounded; capacitor C8 is connected between pin 8 of microcontroller chip U1 and the negative terminal of battery pack B1, and is grounded. Resistor R12 is connected in parallel with capacitor C6.

[0047] Pins 11 and 12 of the microcontroller chip U1 serve as I2C or UART interfaces to adjust the output voltage of the boost circuit 105. Pin 14 serves as a switch control pin, outputting a switch control signal (Power_STBY) to the switch circuit 104 to turn the audio system's power signal on or off. Pin 15 of the microcontroller chip U1 serves as a mute signal pin, used to output a mute signal. Pin 13 of the microcontroller chip U1 serves as a signal sampling feedback pin, connected to the signal sampling feedback circuit 109, used to acquire and receive the real-time power signal feedback from the power amplifier 106.

[0048] The push-button switch circuit 111 includes a button S1, which is connected to pin 16 of the microcontroller chip U1 through resistor R17. When the user wants to turn on the audio system to play music, the button S1 is triggered, and the microcontroller chip U1 receives the power-on command and transmits the power-on command to the switch circuit 104 through pin 14. Conversely, when the user wants to stop playing music, the button S1 is also triggered, and the microcontroller circuit 107 receives the power-off command and transmits the power-off command to the switch circuit 104 through pin 14.

[0049] The switching circuit 104 includes a transistor Q3, a second MOSFET Q4, resistors R13, R14, R15, and R16, and capacitors C9 and C10. The base of transistor Q3 is connected to pin 14 of the microcontroller chip U1 through resistor R13 to receive the power-on / off signal. Its emitter is grounded, and its collector is connected to the gate of the second MOSFET Q4 through resistor R15. Resistor R14 and capacitor C9 are connected in parallel and span between the base and emitter of transistor Q3. Resistor R16 and capacitor C10 are connected in parallel and span between the gate and output of the second MOSFET Q4. In this real-time mode, the input of the second MOSFET Q4 is connected to the positive terminal of battery pack B1. When button S1 is pressed, pin 16 of the microcontroller chip U1 is shorted to ground for 1 second, and pin 14 outputs a high level, thus turning on the second MOSFET Q4 and powering the entire audio system. Similarly, pressing button S1 again shorts the pin to ground again, thus turning off the power to the audio system.

[0050] The boost circuit 105 includes a boost chip U2 with multiple pins, multiple resistors R17, R18, ..., R25, multiple capacitors C11, C12, ..., C22, and an inductor L2. Resistor R17 and capacitor C11 are connected in series between pins 1 and 13 of the boost chip U2. Inductor L2 is connected between pins 1 and 12 of the boost chip U2. Resistor R18 and capacitor C12 are connected in series between pin 1 of the boost chip U2 and ground. Capacitors C13, C14, and C15 are connected in parallel between pin 12 of the boost chip U2 and ground. Pin 12 of the boost chip U2 is simultaneously connected to the battery pack B1 and the output terminal of the second MOSFET Q4 in the switching circuit 104. Resistors R19 and R20 are connected in series and then in parallel with capacitor C16 between pin 2 of boost chip U2 and ground. Capacitor C17 is connected between pin 3 of boost chip U2 and ground. Capacitor C18 is connected between pin 4 of boost chip U2 and ground. Capacitor C19 is connected in series with resistor R20 and then in parallel with capacitor C18. Resistors R22 and R23 are connected in series between pin 8 of boost chip U2 and ground. Pin 5 of boost chip U2 is connected to the common terminal of resistors R21 and R22. Pins 6 and 7 of boost chip U2 are grounded. Capacitors C20 and C21 are connected in parallel between pin 8 of boost chip U2 and ground, and pin 8 serves as the boost signal pin of boost chip U2, connected to power amplifier 106. Resistor R24 ​​and capacitor C22 are connected in series between pin 9 of boost chip U2 and ground, and resistor R25 is connected in parallel with capacitor C22. Pins 10 and 11 of the boost chip U2 serve as I2C or UART pins of the boost chip U2, and are connected to pins 12 and 11 of the microcontroller chip U2 respectively, for communication with the microcontroller chip U2 via I2C or UART.

[0051] The power amplifier circuit 106 includes a power amplifier chip U3 with multiple pins, multiple resistors R26, R27, R28, R29, R30, and R31, multiple capacitors C23, C24, ..., C41, and two inductors L3 and L4. Pins 1, 15, 22, 25, 28, and 33 of the power amplifier chip U3 are grounded; pins 2 and 3 are connected and grounded through capacitor C23; pins 4 and 5 serve as the audio input pins of the power amplifier chip U3, connected to the audio circuit 108 through capacitors C24 and C25 respectively, to receive the audio signals transmitted by the audio circuit 108. Pin 6 of power amplifier chip U3 is connected to pin 11 via capacitor C26, and pin 7 is connected to pin 11 via series resistors R26 and R27; pin 8 is connected to the common terminal of resistors R26 and R27; pins 9, 10, and 11 are connected and grounded simultaneously; pin 12 serves as the mute signal pin of power amplifier chip U3, and is connected to the mute signal pin 15 of microcontroller chip U1 via resistor R28, used to receive the mute signal (Mute) output from microcontroller chip U1; capacitor C27 is connected between pin 12 and ground; pins 13 and 14 serve as I2C or UART pins of power amplifier chip U3, and are connected to I2C or UART pins 11 and 12 of microcontroller chip U1, respectively. Capacitors C28, C29, and C30 are connected in parallel between pin 17 of power amplifier chip U3 and ground. Pin 17 also serves as the boost signal pin for power amplifier chip U3, corresponding to pin 8 of boost chip U2, to receive the high voltage output from boost circuit 105. Pins 18 and 19 are also connected to pin 17. Pin 20 of power amplifier chip U3 is connected to pin 21 via capacitor C31, and pin 24 is connected to pin 23 via capacitor C32, both connected to one end of inductor L3. Similarly, pin 26 is connected to pin 27 via capacitor C33, and pin 30 is connected to pin 29 via capacitor C34, both connected to one end of inductor L4. Resistor R29 is connected in series with capacitor C35 and in parallel with capacitor C36 between the other end of inductor L3 and ground. Likewise, resistor R30 is connected in series with capacitor C37 and in parallel with capacitor C38 between the other end of inductor L4 and ground.

[0052] In this real-time mode, speaker 110 is connected between inductors L3 and L4. Resistor R31 serves as the boost signal pin of power amplifier chip U3, connected in series with capacitor C41, and in parallel with capacitors C39 and C40. It is also connected to pins 31 and 32 of power amplifier chip U3 and pin 8 of boost chip U2, and is used to receive the high voltage output from boost circuit 105.

[0053] In this real-time mode, capacitors C24 and C25 are DC blocking coupling capacitors. Inductor L3, resistor R29, and capacitor 35, together with inductor L4, resistor R30, and capacitor C37, form an LC filter circuit connected between pins 20 and 30 of the power amplifier chip U3, filtering out the amplified high-frequency carrier wave and detecting the useful audio signal. Simultaneously, the speaker 110 converts the electrical signal into a sound signal for playback. In this embodiment, pins 20 and 30 of the power amplifier chip U3 can be referred to as the power amplifier signal output pins.

[0054] The signal sampling feedback circuit 109 includes a transformer T, two diodes D2 and D3, multiple resistors R32, R33, R34, and R35, and multiple capacitors C42, C43, and C44. Capacitor C43 and resistor R34 are connected in series between one end of the primary coil of transformer T and the inductor L3 of the power amplifier circuit 106. Capacitor C44 and resistor R35 are connected in series between the other end of the primary coil of transformer T and the inductor L4 of the power amplifier circuit 106. Transformer T has two secondary coils, which are connected through diodes D2 and D3 respectively, and connected to pin 13 of the microcontroller chip U1 through resistor R33. Resistor R32 and capacitor C42 are connected in parallel between pin 13 of the microcontroller chip U1 and ground. The common terminal of the two secondary coils of transformer T is grounded.

[0055] In this real-time mode, the signal sampling feedback circuit 109 dynamically acquires the actual power consumed by the speaker 110 and outputs it to the microcontroller chip U1. The microcontroller chip U1 analyzes and judges the power consumed by the speaker, thereby determining the output power required by the speaker 110. It can further determine the voltage value required by the power amplifier circuit 106, and then control the voltage value output by the boost circuit 105 in real time through the I2C or UART communication of pins 11 and 12 of the microcontroller chip U1, so as to maximize the working efficiency of the audio system.

[0056] In this real-time mode, firstly, the external power supply Vcc is connected to the pulse width modulation circuit composed of the first MOSFETs Q1 and Q2. The microcontroller chip U1 outputs a pulse width modulation signal (PWM) at pins 1 and 2 to control the voltage duty cycle, thereby controlling the charging current. The resistor R6 connected to pin 9 of the microcontroller chip U1 controls the output current, providing a suitable voltage and current to charge the battery pack B1; the resistor R4 connected to pin 10 sets the cutoff charging voltage value.

[0057] Secondly, capacitor C43, resistor R34, capacitor C44, and resistor 35, after being sampled and attenuated by the power amplifier output, are coupled to transformer T via DC blocking capacitors C43 and C44, respectively. Transformer T then converts the signal into a suitable level. Due to changes in the signal at the primary input of transformer T, the voltage coupled to the two secondary windings also changes. This voltage is then detected and rectified into DC voltage by diodes D2 and D3, filtered by a voltage divider circuit composed of resistors R32 and R33, and filtered by capacitor C42. The output voltage value, which changes with the transient signal, is sampled and analyzed by the analog-to-digital converter built into the microcontroller chip U1, thereby determining the dynamic change in the output signal magnitude of the power amplifier circuit 106.

[0058] Next, the sampling data detected by pins 4 and 13 of the microcontroller chip U1 is analyzed to determine the power consumed by the audio system, thereby determining the output power required by the speaker 110. Further, the required voltage value of the power amplifier can be determined. Then, pins 11 and 12 of the microcontroller chip U1 control the voltage value of the boost circuit 105 to dynamically change with the music signal. Simultaneously, based on the voltage change amplitude detected by pin 4 of the microcontroller chip U1, it can be determined whether the external power supply Vcc output is overloaded. If so, pins 1 and 2 of the microcontroller chip U1 output PWM signals to control the voltage duty cycle, reducing the charging current; otherwise, the original normal charging current is maintained.

[0059] Then, based on the collected data, the microcontroller chip U1 uses the I2C line connected to the power amplifier chip U3 to modulate the DSP inside the power amplifier chip U3, modulating the frequency response, automatic gain control, etc., to improve the sound quality and reduce distortion.

[0060] Finally, the microcontroller chip U1 dynamically samples the actual power consumed by the speaker 110 based on the sampling circuit composed of diode D2, resistors R33, R34, and R35, analyzes and judges the power consumed by the speaker, thereby determining the output power required by the speaker 110. Furthermore, it can determine the voltage value required by the power amplifier circuit 106, and then control the voltage value output by the boost chip U2 in real time through the I2C or UART ports of pins 11 and 12 of the microcontroller chip U1 to maximize the power efficiency of the audio system.

[0061] In summary, the rechargeable smart speaker power management system provided in this embodiment uses a sampling feedback circuit 109 to collect the real-time power of the music played by the speaker and output it to a microcontroller circuit 107. The microcontroller circuit 107 then controls the boost value of the boost circuit 105, thereby controlling the power of the power amplifier circuit 106 and maximizing the power management efficiency of the speaker system.

[0062] Obviously, the embodiments described above are merely some embodiments of the present invention, not all embodiments. The accompanying drawings show preferred embodiments of the present invention, but do not limit the patent scope of the present invention. The present invention can be implemented in many different forms; rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this invention.

Claims

1. A power management system for a rechargeable smart speaker, used to power the smart speaker, amplify externally received audio signals and play them out through a speaker, comprising a power input interface, a charging circuit, a battery pack module, a switching circuit, a boost circuit, and a power amplifier, wherein, The charging circuit receives external power through the power input interface to charge the battery pack module. The switching circuit is used to turn the power supply of the smart speaker on or off. The boost circuit boosts the voltage of the battery pack module and outputs it to the power amplifier. The rechargeable smart speaker power management system further includes: A signal sampling feedback circuit, connected to the power amplifier, is used to acquire the power signal of the power amplifier in real time; and The microcontroller circuit is connected to the charging circuit, the switching circuit, the boost circuit, and the signal sampling feedback circuit. The microcontroller circuit is a microcontroller chip with multiple pins, and the boost circuit includes a boost chip with multiple pins. The boost signal pin of the boost chip is connected to the power amplifier for outputting a boosted voltage signal. The I2C or UART pin of the boost chip is connected to the corresponding I2C or UART pin of the microcontroller chip for adjusting the boost voltage according to the boost control signal of the microcontroller chip. The microcontroller circuit outputs a PWM signal to the charging circuit based on the current magnitude of the power input interface to adjust the charging current and control the charging time of the battery pack module; simultaneously, it controls the output voltage of the boost circuit based on the real-time power signal collected by the signal sampling feedback circuit, so that it changes in real time with the changes of the power amplifier. The charging circuit includes two first MOSFETs Q1 and Q2, resistors R4, R5, R6, R7, and R8, capacitor C2, diode D1, and first inductor L1. Resistor R6 is used to adjust the output charging current. The microcontroller chip includes pins 1, 2, 4, 9, 10, 11, 12, and 13. Pins 1 and 2 are pulse width modulation signal pins of the microcontroller chip. Pin 13 is a signal sampling feedback pin and is connected to the signal sampling feedback circuit. Pin 4 is an external power supply current sensing pin used to detect the magnitude of the external power supply current. Pins 11 and 12 serve as I2C or UART interfaces and are both connected to the boost circuit. One end of the first inductor L1 is connected to the first MOSFET Q2, and the other end is connected to pin 7 of the microcontroller chip U1 through resistor R8. One end of resistor R4 is connected to pin 10 of the microcontroller chip. Resistor R7 and capacitor C2 are connected in series between the first MOSFET Q2 and the other end of resistor R4. At the same time, they are connected in parallel with the first diode D1, and the anode of the first diode D1 is connected to resistor R4. Resistor R5 is connected between pin 10 of the microcontroller chip and resistor R8. Resistor R6 is connected between pin 9 of the microcontroller chip and the anode of the first diode D1, and is grounded. Resistors R4, R7, capacitor C2, first diode D1 and first inductor L1 form a filter voltage regulator circuit. The first MOS transistors Q1 and Q2 form a pulse width modulation switching circuit, and the gates of the first MOS transistors Q1 and Q2 are respectively connected to pin 1 and pin 2. The first MOS transistor Q1 receives external power through the power input interface. Resistors R1 and R3 are connected in series between the common terminal of the first MOSFETs Q1 and Q2 and pin 1 of the microcontroller chip; resistor R2 is connected between the gate of the first MOSFET Q2 and pin 2 of the microcontroller chip; and capacitor C1 is connected between the common terminal of the first MOSFETs Q1 and Q2 and ground. The signal sampling feedback circuit includes a transformer T, two diodes D2 and D3, resistors R32, R33, R34, and R35, and capacitors C42, C43, and C44. The power amplifier 106 includes inductors L3 and L4. In amplifier chip U3, pin 20 is connected to pin 21 via capacitor C31, and pin 24 is connected to pin 23 via capacitor C32, and is also connected to one end of inductor L3. Similarly, pin 26 is connected to pin 27 via capacitor C33, and pin 30 is connected to pin 29 via capacitor C34, and is also connected to one end of inductor L4. Resistor R29 and capacitor C35 are connected in series, and are connected in parallel with capacitor C36 between the other end of inductor L3 and ground. Likewise, resistor R30 and capacitor C37 are connected in series, and are connected in parallel with capacitor C38 between the other end of inductor L4 and ground. Capacitor C43 and resistor R34 are connected in series between one end of the primary coil of transformer T and the inductor L3 of the power amplifier, and capacitor C44 and resistor R35 are connected in series between the other end of the primary coil of transformer T and the inductor L4 of the power amplifier circuit. The transformer T has two secondary coils, which are connected by diodes D2 and D3 respectively, and connected to pin 13 of the microcontroller chip through resistor R33. Resistor R32 and capacitor C42 are connected in parallel between pin 13 of the microcontroller chip and ground. The common terminal of the two secondary coils of the transformer T is grounded.

2. The rechargeable smart speaker power management system according to claim 1, characterized in that, It also includes an audio circuit connected to the power amplifier for inputting external audio signals.

3. The rechargeable smart speaker power management system according to claim 1, characterized in that, It also includes a switch button circuit, which is connected to the microcontroller circuit and is used to output user power on / off commands.

4. The rechargeable smart speaker power management system according to claim 3, characterized in that, The microcontroller circuit is connected to the power amplifier. When the switch button circuit outputs a power on / off signal, the microcontroller circuit outputs a mute signal to the power amplifier, and the power amplifier is instantly turned off to avoid interference from power on / off noise.

5. The rechargeable smart speaker power management system according to claim 1, characterized in that, Also includes: Two voltage divider resistors are used to divide the external power supply into a suitable voltage value; A current-limiting resistor is connected to the common terminal of the two voltage divider resistors and the external power current sensing pin of the microcontroller chip. as well as A current-limiting capacitor, connected in parallel with one of the voltage-dividing resistors, is used to provide a stable reference voltage.

6. The rechargeable smart speaker power management system according to claim 2, characterized in that, The switching circuit includes: The transistor's base is connected to the switch control pin of the microcontroller chip to receive on / off signals, and its emitter is grounded; and The second MOSFET has its gate connected to the collector of the transistor, its input terminal connected to the battery module, and its output terminal used to output a switch control signal.

7. The rechargeable smart speaker power management system according to claim 6, characterized in that, The boost chip is also connected to the output of the second MOS transistor to receive the switching control signal.

8. The rechargeable smart speaker power management system according to claim 7, characterized in that, The power amplifier includes: A power amplifier chip with multiple pins includes an audio input pin connected to the audio circuit for receiving external audio signals; a mute signal pin connected to the mute signal pin of a microcontroller chip for receiving the mute signal; an I2C or UART pin connected to the I2C or UART pin of the microcontroller chip for communication between the two; and a boost signal pin connected to the boost signal pin of a boost converter chip for receiving the boosted voltage signal. An LC filter circuit, connected across the two power amplifier signal output pins of the power amplifier chip, is used to filter out the amplified high-frequency carrier and detect the useful audio signal for the speaker. It includes two inductors, two capacitors, and two resistors. One inductor, resistor, and capacitor are connected in series between one power amplifier signal output pin of the power amplifier chip and ground, and the other inductor, resistor, and capacitor are connected in series between the other power amplifier signal output pin of the power amplifier chip and ground.

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