Low-power-consumption circuit structure for Bluetooth earphone

Abstract

The utility model discloses a low-power-consumption circuit structure for a Bluetooth earphone, which comprises a control module for selecting the use mode of the Bluetooth earphone and an endurance module for switching to low energy consumption of the Bluetooth earphone according to the control module, and the control module is electrically connected with the endurance module; according to the utility model, through the synergistic effect of the low electric quantity automatic selection circuit and the volume control circuit, the low energy consumption mode is automatically triggered and the music volume is reduced when the electric quantity is detected to be lower than a threshold value, the reduction amplitude is about 30-50%, and the non-perception endurance is prolonged. Compared with a traditional manual switching mode, endurance time can be prolonged additionally, the system is especially suitable for continuous playing requirements in a light sleep scene, a dual verification mechanism of the voice control unit and voice instructions of the electret microphone and the LD3320 voice recognition chip are adopted to improve recognition precision, a trigger circuit composed of an STM32 microcontroller and a relay is matched, and the system is simple in structure and convenient to use. The false touch rate of the touch sensor is reduced, and unnecessary power consumption caused by false touch can be avoided.

Description

Technical Field

[0001] This utility model relates to the field of Bluetooth headset technology, specifically a low-power circuit structure for Bluetooth headsets. Background Technology

[0002] Most mainstream wireless Bluetooth earbuds currently offer a battery life of 3-8 hours, which can be extended to 15-40 hours with the charging case. The battery life of Bluetooth earbuds is mainly related to battery capacity, volume settings, and usage mode. Higher volume levels increase power consumption; adjusting the volume appropriately can extend battery life. Switching Bluetooth earbuds to standby mode when not in use can effectively prolong battery life.

[0003] A search revealed a patent with application publication number CN102868428A disclosing an ultra-low power standby Bluetooth device and its implementation method. The Bluetooth device includes a main body and a switching device. The main body contains a control circuit, which includes a Bluetooth module, a low-level triggered ultra-low power switch module, and a high-level triggered reset switch module. The low-level triggered ultra-low power switch module is connected to the deep sleep control pin of the Bluetooth module, and the high-level triggered reset switch module is connected to the ON / OFF terminal of the Bluetooth module. The switching device controls the operation of the low-level triggered ultra-low power switch module and the high-level triggered reset switch module. When using a 50mAh battery, the standby current of this Bluetooth headset is 0.5uA, and the theoretical standby time can reach 2500 hours, equivalent to 104 days. After applying the new technology to the Bluetooth headset, the standby time can be increased from 4 days to 104 days, an improvement of 100 days, significantly reducing the charging frequency and increasing ease of use.

[0004] This Bluetooth headset uses an optimized control circuit and a low-level trigger to activate an ultra-low-power switch module to control the headset into sleep mode, achieving low power consumption. However, this low-power circuit requires manual control to switch. If the user is in a light sleep state and the Bluetooth headset runs out of power during use, the low-power warning tone prompting the user to manually switch to low-power mode is not intelligent enough and affects the user's listening experience. Utility Model Content

[0005] The purpose of this invention is to provide a low-power circuit structure for Bluetooth headsets. By setting a low-power automatic selection circuit that automatically switches to low volume when the battery is low, the Bluetooth headset automatically switches to the low-power mode of the headset when the battery is low and reduces the music volume to extend battery life. This is suitable for listening in a light sleep state.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a low-power circuit structure for Bluetooth headsets, including a control module for selecting the usage mode of the Bluetooth headset and a battery life module that switches to a low-power mode of the Bluetooth headset according to the control module, wherein the control module and the battery life module are electrically connected.

[0007] The control module includes a button control circuit for manually switching the Bluetooth headset to low power mode and a low power automatic selection circuit for automatically switching low volume when the battery is low. The battery life module includes a volume control circuit for automatically reducing the volume of the Bluetooth headset and a voice control unit to prevent the touch sensor from being accidentally activated. The button control circuit, the low power automatic selection circuit, and the volume control circuit are all electrically connected.

[0008] Preferably, the low-battery automatic selection circuit includes amplifier U1.1 and amplifier U1.2. The inverting input terminal of amplifier U1.1 is connected to resistor R70, and the non-inverting input terminal of amplifier U1.1 is connected to resistors R85 and R75. One end of resistor R85 is provided as a signal input terminal. The output terminal of amplifier U1.1 is connected to resistors R76, R81, and R77. One end of resistor R77 is connected to optocoupler U14, and the third pin of optocoupler U14 is connected to resistor R83. One end of resistor R83 is provided as a signal output terminal.

[0009] Preferably, the input and output circuits of the amplifier U1.2 are the same as those of the amplifier U1.1, the amplifier U1.1 is an LM393 model, and the optocoupler U14 is a TLP521GB model.

[0010] Preferably, the volume control circuit includes transistors Q1 and Q2. A resistor R1 and a capacitor C2 are connected to the base of transistor Q1. A resistor R3 is connected to the emitter of transistor Q1. A capacitor C5 is connected to the base of transistor Q2. A resistor R5 is connected between the collector and base of transistor Q2. A capacitor C4 is connected to one end of capacitor C5. A capacitor C3 is connected to the emitter of transistor Q1. One end of capacitor C4 is connected to capacitor C3. A resistor R4 is connected between capacitor C3 and capacitor C4.

[0011] Preferably, the voice control unit includes a voice input and processing circuit, and a control execution circuit that controls the touch sensor of the Bluetooth headset to start based on the processed voice input signal. The voice input and processing circuit is electrically connected to the control execution circuit.

[0012] Preferably, the voice input and processing circuit includes an electret microphone for acquiring sound signals, a signal amplifier for amplifying the weak signals acquired by the electret microphone, an analog-to-digital converter for converting the amplified analog voice signals into digital signals, and an LD3320 voice recognition chip for voice recognition of the converted digital signals. The LD3320 voice recognition chip is electrically connected to the electret microphone, the signal amplifier, and the analog-to-digital converter.

[0013] Preferably, the control execution circuit includes an STM32 microcontroller that parses voice commands and outputs control signals, a relay electrically connected to the STM32 microcontroller, and the relay electrically connected to the on / off circuit of the Bluetooth headset touch sensor.

[0014] Preferably, the button control circuit includes a MOSFET Q11, the MOSFET Q11 is an AO3401 model, the source (S) terminal of the MOSFET Q11 is connected to a switch SW1, one end of the switch SW1 is connected to a resistor R11, and one end of the resistor R11 is connected to the gate (G) terminal of the MOSFET Q11.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This invention utilizes the synergistic effect of a low-battery automatic selection circuit and a volume control circuit to automatically trigger a low-power mode and reduce music volume when the battery level is detected to be below a threshold, achieving a seamless extension of battery life. Compared to traditional manual switching methods, this provides additional battery life and is particularly suitable for continuous playback needs during light sleep.

[0017] 2. The voice control unit adopts a dual verification mechanism. The voice commands of the electret microphone and LD3320 voice recognition chip improve the recognition accuracy. Combined with the trigger circuit composed of STM32 microcontroller and relay, the false touch rate of touch sensor is reduced, which can avoid unnecessary power consumption caused by false touch. Attached Figure Description

[0018] Figure 1 This is a system diagram of this utility model;

[0019] Figure 2 This is the circuit diagram of the low battery automatic selection circuit of this utility model;

[0020] Figure 3 This is a circuit diagram of the volume control circuit of this utility model;

[0021] Figure 4 This is the circuit diagram of the button control circuit of this utility model. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-4 This utility model provides a technical solution: a low-power circuit structure for Bluetooth headsets, including a control module for selecting the usage mode of the Bluetooth headset and a battery life module that switches to the low-power mode of the Bluetooth headset according to the control module, wherein the control module and the battery life module are electrically connected.

[0024] The control module includes a button control circuit for manually switching the Bluetooth headset to low power mode and a low power automatic selection circuit for automatically switching low volume when the battery is low. The battery life module includes a volume control circuit for automatically reducing the volume of the Bluetooth headset and a voice control unit to prevent the touch sensor from being accidentally activated. The button control circuit, the low power automatic selection circuit, and the volume control circuit are all electrically connected.

[0025] The circuit system employs a dual-module collaborative operation. The control module is responsible for mode switching and sends control commands to the battery module by monitoring user operations and battery status in real time. The battery module dynamically adjusts the audio output power and touch sensitivity according to the commands, and reduces the number of invalid wake-ups to achieve energy-saving goals by adjusting the volume and suppressing accidental touches. The two modules communicate with each other via the I2C bus.

[0026] The low-battery automatic selection circuit includes amplifiers U1.1 and U1.2. A resistor R70 is connected to the inverting input terminal of amplifier U1.1, and resistors R85 and R75 are connected to the non-inverting input terminal of amplifier U1.1. One end of resistor R85 is provided as a signal input terminal. Resistors R76, R81, and R77 are connected to the output terminal of amplifier U1.1. One end of resistor R77 is connected to optocoupler U14, and resistor R83 is connected to the third pin of optocoupler U14. One end of resistor R83 is provided as a signal output terminal.

[0027] The button control circuit provides a manual active energy-saving mode; the low battery automatic selection circuit collects battery data in real time through a voltage monitoring chip, such as TI's BQ27425, and triggers a protection mechanism when the voltage drops to the 3.3V threshold (the inflection point of a typical lithium battery discharge curve).

[0028] The input and output circuits of the amplifier U1.2 are the same as those of the amplifier U1.1. The amplifier U1.1 uses the LM393 model, and the optocoupler U14 uses the TLP521GB model.

[0029] A window comparator circuit is constructed based on dual comparators of LM393. Amplifier U1.1 forms a non-inverting amplifier to amplify the battery voltage divider signal to a detectable range. Amplifier U1.2 forms a hysteresis comparator, which introduces positive feedback through resistor R81. When Vbat < 3.3V, it outputs a high level to drive optocoupler TLP521GB (CTR value reaches 130%). The secondary side of the optocoupler outputs a PWM dimming signal to the audio codec (such as CSR8670) through resistor R83, gradually reducing the gain in 0.5dB steps.

[0030] The volume control circuit includes transistors Q1 and Q2. A resistor R1 and a capacitor C2 are connected to the base of transistor Q1. A resistor R3 is connected to the emitter of transistor Q1. A capacitor C5 is connected to the base of transistor Q2. A resistor R5 is connected between the collector and base of transistor Q2. A capacitor C4 is connected to one end of capacitor C5. A capacitor C3 is connected to the emitter of transistor Q1. One end of capacitor C4 is connected to capacitor C3. A resistor R4 is connected between capacitor C3 and capacitor C4.

[0031] A complementary symmetry transistor structure is employed. Soft-start is achieved through resistor R1 and capacitor C2, while capacitors C3 and C4 form a π-type filter to eliminate high-frequency noise. Resistors R4 and R5 set the quiescent operating point, ensuring THD < 0.05%. When the control signal arrives, the conduction angles of transistors Q1 and Q2 decrease, limiting the output swing and achieving volume attenuation.

[0032] The voice control unit includes a voice input and processing circuit, and a control execution circuit that controls the touch sensor of the Bluetooth headset to start based on the processed voice input signal. The voice input and processing circuit is electrically connected to the control execution circuit.

[0033] The voice input and processing circuit includes an electret microphone for acquiring sound signals, a signal amplifier for amplifying the weak signals acquired by the electret microphone, an analog-to-digital converter for converting the amplified analog voice signals into digital signals, and an LD3320 voice recognition chip for voice recognition of the converted digital signals. The LD3320 voice recognition chip is electrically connected to the electret microphone, the signal amplifier, and the analog-to-digital converter.

[0034] The voice input and processing circuit has the same structure as existing voice input processing circuits. The electret microphone is amplified by an INA128 instrumentation amplifier, and then sampled 16-bit by an ADS1115. The LD3320 uses a dynamic time warping algorithm to recognize commands. The recognized commands are then verified by an STM32F030. The touch IC, controlled by a G6K-2F relay and the EN pin of the CY8C4014, is used to improve the false touch suppression rate.

[0035] The control execution circuit includes an STM32 microcontroller that parses voice commands and outputs control signals, a relay electrically connected to the STM32 microcontroller, and the relay electrically connected to the on / off circuit of the Bluetooth headset touch sensor.

[0036] The button control circuit includes a MOSFET Q11, which is an AO3401 model. A switch SW1 is connected to the source (S) terminal of the MOSFET Q11. A resistor R11 is connected to one end of the switch SW1, and one end of the resistor R11 is connected to the gate (G) terminal of the MOSFET Q11.

[0037] An AO3401 is used to construct the load switching circuit. SW1 is a self-locking button; when pressed, it charges the gate capacitor through R11. An internal body diode provides a reverse current path. A 3-second long press triggers mode switching, detected by the STM32's GPIO interrupt.

[0038] When in use, if the user is in a light sleep state and the Bluetooth headset is low on battery, the control module collects battery data in real time through the voltage monitoring chip TI's BQ27425. When the voltage drops to the 3.3V threshold, it outputs a high level to drive the optocoupler TLP521GB (CTR value reaches 130%). The secondary side of the optocoupler outputs a PWM dimming signal to the audio codec (such as CSR8670) through resistor R83, gradually reducing the gain in 0.5dB steps to control the volume and save energy. In addition, the touch sensor of the Bluetooth headset requires voice input through the electret microphone, which is recognized by the LD3320 voice recognition chip to be activated, preventing accidental touches from causing unnecessary power consumption.

[0039] Compared to traditional manual hard switching, this Bluetooth headset can achieve imperceptible battery life extension, improving the user's listening experience.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-power circuit structure for Bluetooth headsets, characterized in that: The application relates to a control module for selecting the use mode of a Bluetooth headset and a continuation module for switching the Bluetooth headset to a low-energy mode according to the control module, wherein the control module is electrically connected with the continuation module. The control module comprises a button control circuit for manually switching the Bluetooth headset to a low-energy mode and a low-power automatic selection circuit for automatically switching the Bluetooth headset to a low volume mode when the power is low, and the continuation module comprises a volume control circuit for automatically reducing the volume of the Bluetooth headset, a voice control unit for preventing the touch sensor from being activated by mistake, and the button control circuit, the low-power automatic selection circuit and the volume control circuit are electrically connected.

2. The low-power-consumption circuit structure for a Bluetooth earphone according to claim 1, characterized in that: The low-power automatic selection circuit comprises an amplifier U1.1 and an amplifier U1.2, the reverse input end of the amplifier U1.1 is connected with a resistor R70, the positive input end of the amplifier U1.1 is connected with a resistor R85 and a resistor R75, one end of the resistor R85 is provided with a signal input end, the output end of the amplifier U1.1 is connected with a resistor R76, a resistor R81 and a resistor R77, one end of the resistor R77 is connected with an optical coupler U14, one end of a resistor R83 connected with the optical coupler U14 is provided with a signal output end.

3. The low-power-consumption circuit structure for a Bluetooth earphone according to claim 2, characterized in that: The input and output circuit of the amplifier U1.2 is the same as that of the amplifier U1.1, the amplifier U1.1 adopts an LM393 type, and the optical coupler U14 adopts a TLP521GB type.

4. The low-power-consumption circuit structure for a Bluetooth earphone according to claim 3, characterized in that: The volume control circuit comprises a triode Q1 and a triode Q2, the base of the triode Q1 is connected with a resistor R1 and a capacitor C2, the emitter of the triode Q1 is connected with a resistor R3, the base of the triode Q2 is connected with a capacitor C5, the collector and the base of the triode Q2 are connected with a resistor R5, one end of the capacitor C5 is connected with a capacitor C4, the emitter of the triode Q1 is connected with a capacitor C3, one end of the capacitor C4 is connected with the capacitor C3, and the capacitor C3 and the capacitor C4 are connected with a resistor R4.

5. The low-power-consumption circuit structure for a Bluetooth earphone according to claim 4, characterized in that: The voice control unit comprises a voice input and processing circuit, a control execution circuit for controlling the touch sensor of the Bluetooth headset according to the signal processed according to the voice input, and the voice input and processing circuit and the control execution circuit are electrically connected.

6. The low-power-consumption circuit structure for a Bluetooth earphone according to claim 5, characterized in that: The voice input and processing circuit comprises an electret microphone for collecting a sound signal, a signal amplifier for amplifying the weak signal collected by the electret microphone, an analog-to-digital converter for converting the analog voice signal amplified into a digital signal, and an LD3320 voice recognition chip for voice recognition of the converted digital signal, and the LD3320 voice recognition chip, the electret microphone, the signal amplifier and the analog-to-digital converter are electrically connected.

7. The low-power-consumption circuit structure for a Bluetooth earphone according to claim 6, characterized in that: The control execution circuit comprises an STM32 microcontroller for analyzing voice instructions and outputting control signals, and a relay electrically connected with the STM32 microcontroller, and the relay is electrically connected with the start-stop circuit of the touch sensor of the Bluetooth headset.

8. The low-power-consumption circuit structure for a Bluetooth earphone according to claim 7, characterized in that: The key control circuit comprises a MOS tube Q11, the MOS tube Q11 adopts AO3401 model, the S pole of the MOS tube Q11 is connected with a switch SW1, one end of the switch SW1 is connected with a resistor R11, and one end of the resistor R11 is connected with the G pole of the MOS tube Q11.

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