Simple double-charging sound box circuit

Abstract

The utility model relates to the technical field of sound equipment, and provides a simple double-charging sound equipment circuit, a charging management circuit comprises a USB socket, a solar cell U5, a power supply management chip U2, a triode Q2, a diode D2, a diode D3, a resistor R19 and a resistor R20, an output end of the USB socket is connected with an emitting electrode of the triode Q2, a collector electrode of the triode Q2 is connected with an anode of the diode D2, and a cathode of the diode D3 is connected with an anode of the resistor R19. The cathode of the diode D2 is connected with the input end of the power management chip U2, the output end of the solar cell U5 is connected with the input end of the power management chip U2 through the diode D3, the resistor R19 and the resistor R20 are connected between the anode of the diode D3 and the ground in series, the series connection point of the resistor R19 and the resistor R20 is connected with the base electrode of the triode Q2, and the output end of the power management chip U2 charges a sound battery. According to the technical scheme, the problems that in the prior art, a sound box is single in charging mode and poor in endurance effect are solved.

Description

Technical Field

[0001] This utility model relates to the field of audio technology, specifically to a simple dual-charging audio circuit. Background Technology

[0002] With the widespread adoption of smartphones, smart home devices, and other similar products, portable speakers have gradually become popular audio devices due to their convenient connectivity, excellent sound quality, and compact size. However, battery life remains a key concern for users. Traditional single-battery power solutions are insufficient for extended outdoor use; therefore, developing speaker circuits with dual charging capabilities is particularly important. Utility Model Content

[0003] This invention proposes a simple dual-charging speaker circuit, which solves the problems of single charging method and poor battery life in the existing technology.

[0004] The technical solution of this utility model is as follows:

[0005] A simple dual-charging speaker circuit includes a control circuit, a button circuit, an audio circuit, and a charging management circuit. The button circuit and the audio circuit are both connected to the control circuit. The charging management circuit includes a USB port, a solar cell U5, a power management chip U2, a transistor Q2, a diode D2, a diode D3, resistors R19 and R20. The output terminal of the USB port is connected to the emitter of the transistor Q2, the collector of the transistor Q2 is connected to the anode of the diode D2, the cathode of the diode D2 is connected to the input terminal of the power management chip U2, the output terminal of the solar cell U5 is connected to the input terminal of the power management chip U2 through the diode D3, resistors R19 and R20 are connected in series between the anode of the diode D3 and ground, and the series connection point of resistors R19 and R20 is connected to the base of the transistor Q2. The output terminal of the power management chip U2 charges the speaker battery.

[0006] Furthermore, the charging management circuit also includes a voltage detector U6, a PMOS transistor Q3, resistors R17 and R18. The PMOS transistor Q3 is connected in series between the output terminal of the solar cell U5 and the anode of the diode D3. The source of the PMOS transistor Q3 is connected to the output terminal of the solar cell U5, and the drain of the PMOS transistor Q3 is connected to the anode of the diode D3. Resistors R17 and R18 are connected in series between the output terminal of the solar cell U5 and ground. The gate of the PMOS transistor Q3 is connected to the series connection point of resistors R17 and R18. The input terminal of the voltage detector is connected to the positive terminal of the audio battery, and the output terminal of the voltage detector is connected to the gate of the PMOS transistor.

[0007] Furthermore, the audio circuit includes a power amplifier chip U4, a transistor Q1, resistors R23, R26, R25, R28, R29, and R27, capacitors C10, C11, and C22, and a speaker. The control terminal of the power amplifier chip U4 is connected to the collector of the transistor Q1 through resistor R25. The emitter of the transistor Q1 is grounded. The base of the transistor Q1 is connected to the control circuit through resistor R23. The base of the transistor Q1 is connected to the emitter through resistor R26. The input terminal of the power amplifier chip U4 is connected to the first terminal of the capacitor C22 through resistor R27. The second terminal of the capacitor C22 is connected to the first audio output of the control circuit through resistor R28 and capacitor C10 in sequence. The second terminal of the capacitor C22 is connected to the second audio output of the control circuit through resistor R29 and capacitor C11 in sequence. The output terminal of the power amplifier chip U4 is connected to the speaker.

[0008] Furthermore, the audio circuit also includes a headphone jack. The first end of the headphone jack is connected to the first audio output of the control circuit through capacitor C19. The second end of the headphone jack is connected to the second audio output of the control circuit through capacitor C20. The third end of the headphone jack is connected to the headphone enable output of the control circuit through resistor R20. The fourth end of the headphone jack is grounded.

[0009] Furthermore, the control circuit includes a microcontroller U1 with model number AC6966.

[0010] Furthermore, it also includes a storage circuit and a radio circuit, both of which are connected to the control circuit, and are used to acquire audio input.

[0011] Furthermore, the button circuit includes a power button, a start / stop button, a volume adjustment button, a song adjustment button, and a mode adjustment button. One end of each of the power button, start / stop button, volume adjustment button, song adjustment button, and mode adjustment button is connected to the control circuit, and the other end is grounded.

[0012] The working principle and beneficial effects of this utility model are as follows:

[0013] In this invention, in USB charging mode, when the USB port is connected to an external power source, current is allowed to flow through transistor Q2, rectified by diode D2, and then sent to the input terminal of power management chip U2. In solar charging mode, solar cell U5 converts light energy into electrical energy, which is rectified by diode D3 and then sent to the input terminal of power management chip U2. Power management chip U2 is responsible for monitoring and regulating the input current and voltage to ensure safe and efficient charging of the speaker battery. The anode of diode D3 is connected to the control terminal of transistor Q2, forming an interlock mechanism. When the solar cell is charging, the anode of diode D3 is at a high level, and the voltage is divided by resistors R19 and R20, causing transistor Q2 to be cut off, preventing current from flowing through the USB port; conversely, when the solar cell is not charging, transistor Q2 is on, allowing current from the USB port to be rectified by D2 and then sent to power management chip U2 for charging. This provides users with great flexibility. Whether charging via USB indoors or relying on solar power outdoors, it can easily charge audio equipment, ensuring continuous music playback.

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0015] Figure 1 This is a circuit diagram of the charging management circuit in this utility model;

[0016] Figure 2 This is a circuit diagram of the audio circuit in this utility model;

[0017] Figure 3 This is a circuit diagram of the control circuit in this utility model;

[0018] Figure 4 This is a circuit diagram of the button circuit in this utility model. Detailed Implementation

[0019] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0020] Example 1

[0021] This embodiment proposes a simple dual-charging speaker circuit, including a control circuit, a button circuit, an audio circuit, and a charging management circuit. The button circuit and the audio circuit are both connected to the control circuit, such as... Figure 1As shown, the charging management circuit includes a USB port, a solar cell U5, a power management chip U2, a transistor Q2, a diode D2, a diode D3, resistors R19 and R20. The output terminal of the USB port is connected to the emitter of transistor Q2. The anode of transistor Q2 is connected to the collector of diode D2. The cathode of diode D2 is connected to the input terminal of power management chip U2. The output terminal of solar cell U5 is connected to the input terminal of power management chip U2 through diode D3. Resistors R19 and R20 are connected in series between the anode of diode D3 and ground. The series connection point of resistors R19 and R20 is connected to the base of transistor Q2. The output terminal of power management chip U2 charges the speaker battery.

[0022] In this embodiment, the speaker circuit integrates a control circuit, a button circuit, an audio circuit, and an innovative dual-path charging management circuit. The dual-path charging management circuit is the core of this embodiment, allowing the speaker to be charged via both a USB port and a solar cell U5. In USB charging mode, when the USB port is connected to an external power source, current is allowed to flow through transistor Q2, rectified by diode D2 (ensuring consistent current direction), and then fed to the input of power management chip U2. In solar charging mode, solar cell U5 converts light energy into electrical energy, which is rectified by diode D3 and then fed to the input of power management chip U2. Power management chip U2 monitors and regulates the input current and voltage to ensure safe and efficient charging of the speaker battery. The anode of diode D3 is connected to the control terminal of transistor Q2, forming an interlock mechanism. When the solar cell is charging, the anode of diode D3 is at a high level. After voltage division through resistors R19 and R20, transistor Q2 is cut off, preventing current from flowing through the USB port. Conversely, when the solar cell is not charging, transistor Q2 is turned on, allowing current from the USB port to be rectified by D2 and then sent to the power management chip U2 for charging.

[0023] The dual-charging speaker circuit in this embodiment provides users with great flexibility. Whether charging indoors via USB or outdoors using solar power, it can easily charge the speaker equipment, ensuring continuous music playback. Furthermore, by employing the power management chip U2, the circuit can effectively monitor and manage the charging process, preventing battery damage such as overcharging and over-discharging, thus extending battery life. Simultaneously, the combined use of transistor Q2 and diodes D2 and D3 not only achieves intelligent switching of the charging path but also ensures the safety and stability of the circuit.

[0024] Furthermore, such as Figure 1As shown, the charging management circuit also includes a voltage detector U6, a PMOS transistor Q3, resistors R17 and R18. The PMOS transistor Q3 is connected in series between the output terminal of the solar cell U5 and the anode of the diode D3. The source of the PMOS transistor Q3 is connected to the output terminal of the solar cell U5, and the drain of the PMOS transistor Q3 is connected to the anode of the diode D3. Resistors R17 and R18 are connected in series between the output terminal of the solar cell U5 and ground. The gate of the PMOS transistor Q3 is connected to the series connection point of resistors R17 and R18. The input terminal of the voltage detector is connected to the positive terminal of the audio battery, and the output terminal of the voltage detector is connected to the gate of the PMOS transistor.

[0025] In this embodiment, PMOS transistor Q3 is connected in series between the output terminal of solar cell U5 and the anode of diode D3, acting as a switch. When the voltage generated by solar cell U5 is sufficiently high (i.e., the sunlight is strong enough) and the voltage of the speaker battery is below a certain threshold, voltage detector U6 outputs a signal. This signal, after passing through the voltage divider network of resistors R17 and R18, controls the gate voltage of PMOS transistor Q3, turning it on. Thus, the electrical energy generated by solar cell U5 can be rectified by PMOS transistor Q3 and diode D3 and sent to power management chip U2 for charging. Voltage detector U6 monitors the voltage state of the speaker battery in real time. When the battery voltage reaches or exceeds a preset charging completion threshold, voltage detector U6 changes its output state, turning off PMOS transistor Q3 by adjusting the gate voltage. This prevents overcharging risk, even if solar cell U5 is still generating electrical energy.

[0026] Furthermore, such as Figure 2 As shown, the audio circuit includes a power amplifier chip U4, a transistor Q1, resistors R23, R26, R25, R28, R29, and R27, capacitors C10, C11, and C22, and a speaker. The control terminal of the power amplifier chip U4 is connected to the collector of the transistor Q1 through resistor R25. The emitter of the transistor Q1 is grounded. The base of the transistor Q1 is connected to the control circuit through resistor R23. The base of the transistor Q1 is connected to the emitter through resistor R26. The input terminal of the power amplifier chip U4 is connected to the first terminal of capacitor C22 through resistor R27. The second terminal of capacitor C22 is connected to the first audio output of the control circuit through resistor R28 and capacitor C10 in sequence. The second terminal of capacitor C22 is connected to the second audio output of the control circuit through resistor R29 and capacitor C11 in sequence. The output terminal of the power amplifier chip U4 is connected to the speaker.

[0027] In this embodiment, the audio circuit amplifies the audio signal output from the control circuit to drive the speaker. The left and right channel audio signals output from the control circuit are fed into the audio circuit through filter networks composed of resistor R28 and capacitor C10 and resistor R29 and capacitor C11, respectively. The main function of these two filter networks is to remove DC components and high-frequency noise from the audio signal, ensuring the purity of the audio signal. The control circuit sends a control signal to the base of transistor Q1 through resistor R23. This control signal is a DC voltage used to adjust the conduction level of transistor Q1, thereby indirectly controlling the gain of power amplifier chip U4. Resistor R26 serves as the feedback resistor for transistor Q1, helping to stabilize its operating state and prevent signal distortion. The filtered left and right channel audio signals are fed into the input terminals of power amplifier chip U4 through resistor R27. Power amplifier chip U4 contains a power amplifier that can amplify the weak input audio signal to a sufficient power level to drive the speaker.

[0028] Furthermore, such as Figure 2 As shown, the audio circuit also includes a headphone jack. The first end of the headphone jack is connected to the first audio output of the control circuit through capacitor C19. The second end of the headphone jack is connected to the second audio output of the control circuit through capacitor C20. The third end of the headphone jack is connected to the headphone enable output of the control circuit through resistor R20. The fourth end of the headphone jack is grounded.

[0029] In this embodiment, the first and second ends of the headphone jack are connected to the first and second audio outputs of the control circuit via capacitors C19 and C20, respectively. These capacitors isolate the DC component and couple the AC audio signal. When headphones are plugged in, the left and right channel audio signals output by the control circuit are transmitted to the headphones through these two capacitors, driving the headphones to produce sound. When headphones are not plugged in, the audio signal is transmitted normally to the power amplifier chip U4, driving the speaker to produce sound. When headphones are plugged in and detected by the control circuit, the control circuit adjusts the distribution of the audio signal, directing it primarily to the headphone jack, while reducing or stopping the audio signal output to the power amplifier chip U4, ensuring that the audio signal does not simultaneously drive the speaker and headphones, causing sound interference or sound quality degradation.

[0030] Furthermore, such as Figure 3 As shown, the control circuit includes a single-chip microcomputer U1 with model number AC6966.

[0031] Furthermore, it also includes a storage circuit and a radio circuit, both of which are connected to the control circuit. The storage circuit and radio circuit are used to acquire audio input. Playback modes can be switched via a button circuit, using either the storage circuit or the radio circuit as the audio input.

[0032] Furthermore, such as Figure 4As shown, the button circuit includes a power button, a start / stop button, a volume control button, a song control button, and a mode control button. One end of each of the power button, start / stop button, volume control button, song control button, and mode control button is connected to the control circuit, and the other end is grounded.

[0033] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A simple dual-charging speaker circuit, characterized in that, The device includes a control circuit, a button circuit, an audio circuit, and a charging management circuit. The button circuit and the audio circuit are both connected to the control circuit. The charging management circuit includes a USB port, a solar cell U5, a power management chip U2, a transistor Q2, a diode D2, a diode D3, a resistor R19, and a resistor R20. The output terminal of the USB port is connected to the emitter of the transistor Q2, the collector of the transistor Q2 is connected to the anode of the diode D2, the cathode of the diode D2 is connected to the input terminal of the power management chip U2, the output terminal of the solar cell U5 is connected to the input terminal of the power management chip U2 through the diode D3, the resistors R19 and R20 are connected in series between the anode of the diode D3 and ground, and the series connection point of the resistors R19 and R20 is connected to the base of the transistor Q2. The output terminal of the power management chip U2 charges the speaker battery.

2. The simplified dual-charging speaker circuit according to claim 1, characterized in that, The charging management circuit also includes a voltage detector U6, a PMOS transistor Q3, resistors R17 and R18. The PMOS transistor Q3 is connected in series between the output terminal of the solar cell U5 and the anode of the diode D3. The source of the PMOS transistor Q3 is connected to the output terminal of the solar cell U5, and the drain of the PMOS transistor Q3 is connected to the anode of the diode D3. Resistors R17 and R18 are connected in series between the output terminal of the solar cell U5 and ground. The gate of the PMOS transistor Q3 is connected to the series connection point of resistors R17 and R18. The input terminal of the voltage detector is connected to the positive terminal of the audio battery, and the output terminal of the voltage detector is connected to the gate of the PMOS transistor.

3. The simplified dual-charging speaker circuit according to claim 1, characterized in that, The audio circuit includes a power amplifier chip U4, a transistor Q1, resistors R23, R26, R25, R28, R29, and R27, capacitors C10, C11, and C22, and a speaker. The control terminal of the power amplifier chip U4 is connected to the collector of the transistor Q1 through resistor R25. The emitter of the transistor Q1 is grounded. The base of the transistor Q1 is connected to the control circuit through resistor R23. The base of the transistor Q1 is connected to the emitter through resistor R26. The input terminal of the power amplifier chip U4 is connected to the first terminal of the capacitor C22 through resistor R27. The second terminal of the capacitor C22 is connected to the first audio output of the control circuit through resistor R28 and capacitor C10. The second terminal of the capacitor C22 is connected to the second audio output of the control circuit through resistor R29 and capacitor C11. The output terminal of the power amplifier chip U4 is connected to the speaker.

4. A simplified dual-charging speaker circuit according to claim 3, characterized in that, The audio circuit also includes a headphone jack. The first end of the headphone jack is connected to the first audio output of the control circuit through capacitor C19. The second end of the headphone jack is connected to the second audio output of the control circuit through capacitor C20. The third end of the headphone jack is connected to the headphone enable output of the control circuit through resistor R20. The fourth end of the headphone jack is grounded.

5. A simplified dual-charging speaker circuit according to claim 1, characterized in that, The control circuit includes a single-chip microcomputer U1 with model number AC6966.

6. A simplified dual-charging speaker circuit according to claim 1, characterized in that, It also includes a storage circuit and a radio circuit, both of which are connected to the control circuit. The storage circuit and the radio circuit are used to acquire audio input.

7. A simplified dual-charging speaker circuit according to claim 6, characterized in that, The button circuit includes a power button, a start / stop button, a volume control button, a song control button, and a mode control button. One end of each of the power button, start / stop button, volume control button, song control button, and mode control button is connected to the control circuit, and the other end is grounded.

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