Wake-up circuit, chip and electronic device
By designing a wake-up circuit, the earphones can be autonomously woken up without a battery charging case by utilizing a power supply module and a level conversion module. This solves the compatibility problem between Bluetooth earphones and battery-less charging cases, reduces the cost of the charging case, and improves the flexibility of use.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN BLUETRUM TECH CO LTD
- Filing Date
- 2025-05-22
- Publication Date
- 2026-07-07
AI Technical Summary
Existing Bluetooth earphones are incompatible with the wake-up solution of battery-less charging cases, resulting in an unsuitable wake-up mechanism, which increases the cost of the charging case and reduces its flexibility.
Design a wake-up circuit, including a power supply module, a voltage control module, a level conversion module, and a DC detection module. The power supply of the earphone body controls the charging contacts to output different voltages in the disconnected and connected states. Combined with level conversion and DC detection, the earphone can achieve autonomous wake-up and adapt to the battery-less charging case.
It enables the earbuds to wake up autonomously without a battery charging case, reduces the cost of the charging case, and is compatible with charging cases with batteries, making it more flexible to use.
Smart Images
Figure CN224473405U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of analog integrated circuit technology, and more particularly to a wake-up circuit, chip, and electronic device. Background Technology
[0002] Nowadays, the battery life of many Bluetooth earbuds is sufficient for daily use, making batteries an optional feature in Bluetooth earbud charging cases. Similar to charging cases with batteries, these cases can provide 5V power to the earbuds' charging ports when connected to a 5V source. However, unlike traditional charging cases without batteries, these cases cannot provide power to the earbuds without a 5V connection, nor can they raise the charging port voltage for communication. Due to these differences, the wake-up mechanism for Bluetooth earbuds paired with battery-less charging cases needs to be redesigned. Utility Model Content
[0003] One objective of this application is to provide a wake-up circuit, chip, and electronic device to complement a wake-up solution for a battery-free charging case.
[0004] In a first aspect, embodiments of this application provide a wake-up circuit applied to a wireless Bluetooth headset, comprising:
[0005] The power supply module is used to provide the initial voltage;
[0006] A voltage control module, connected to the power supply module, is used to output a second voltage to the charging contacts of the earphone according to the first voltage. The voltage control module outputs the second voltage of different amplitudes when the charging contacts are in an open state and an open state.
[0007] A level conversion module, connected to the charging contact, is used to output a wake-up control level based on the third voltage of the charging contact; and
[0008] The DC detection module is connected to the power supply module and the charging contacts respectively, and is used to output a DC detection voltage according to the first voltage and the third voltage. The DC detection voltage is used to determine whether the earphone is in a charging environment.
[0009] The control module is connected to the output of the level conversion module and the output of the DC detection module, and is used to determine the headphone wake-up strategy based on the wake-up control level and the DC detection voltage.
[0010] Optionally, the control module determines the headphone wake-up strategy based on the DC detection voltage and the wake-up control level, specifically,
[0011] When the DC detection voltage determines that the earphone is in a charging environment, the control module executes the second wake-up strategy;
[0012] When the DC detection voltage determines that the earphone is in a non-charging environment, the control module executes the first wake-up strategy.
[0013] Optionally, the first wake-up strategy is specifically as follows:
[0014] Based on the difference in amplitude of the second voltage when the charging contact is disconnected and connected, the level transition of the wake-up control level corresponding to the third voltage at different amplitudes of the charging contact is obtained, and the earphone is woken up according to the level transition.
[0015] Optionally, the second wake-up strategy is specifically as follows:
[0016] The headphones are woken up based on the level of the DC detection voltage.
[0017] Optionally, the voltage control module includes a current mirror circuit, the current mirror comprising:
[0018] The first mirror branch is connected to the power supply module and forms a current source under the control of the enable signal of the control module;
[0019] The second mirror branch mirrors the current of the first mirror circuit and outputs the second voltage at the load terminal.
[0020] Optionally, the level conversion module includes an inverter, the input terminal of which is connected to the charging contact, and outputs a wake-up control level based on the third voltage of the charging contact.
[0021] Optionally, the DC detection module includes a comparison circuit, the first input terminal of the comparison circuit is connected to the first voltage, the second input terminal of the comparison circuit is connected to the third voltage, and the output terminal of the comparison circuit is connected to the control module.
[0022] Secondly, embodiments of this application provide a chip including a wake-up circuit as described in any of the preceding claims.
[0023] Thirdly, embodiments of this application provide an electronic device, including the chip described above.
[0024] The embodiments of this application can achieve the following technical effects: the wake-up circuit, when the charging case is without power, is powered by the earphone itself, and the voltage control module controls the charging contacts to output different voltages when disconnected from and connected to the charging case. After these voltages are converted into corresponding levels by the level conversion module, the earphone can wake up and start working by detecting the level conversion. It can be adapted to existing battery-less charging cases, reducing the cost of the charging case. At the same time, it is compatible with charging case solutions with batteries by utilizing the DC detection module, making it flexible in use. Attached Figure Description
[0025] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings do not constitute a limitation on scale.
[0026] Figure 1 This is a block diagram illustrating the principle of a wake-up circuit for a wireless Bluetooth headset in the prior art.
[0027] Figure 2 A schematic block diagram of a wake-up circuit provided in an embodiment of this application;
[0028] Figure 3 A detailed circuit diagram of the current mirror circuit provided in the embodiments of this application;
[0029] Figure 4 A specific circuit diagram of the inverter provided in the embodiments of this application;
[0030] Figure 5 A detailed circuit diagram of the comparison circuit provided in the embodiments of this application;
[0031] Figure 6 The following is a detailed circuit diagram of the pull-down module provided in the embodiments of this application. Detailed Implementation
[0032] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as "connected" to another element, it can be directly on the other element, or one or more intermediate elements can exist between them. The terms "upper," "lower," "left," "right," "upper end," "lower end," "top," and "bottom," etc., used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0033] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention.
[0034] Reference Figure 1The document illustrates a wake-up scheme for existing wireless Bluetooth earbuds. This scheme includes a charging case and Bluetooth earbuds. The charging case includes charging contacts N1 and N2, a control circuit, and a rechargeable battery. The earbuds include charging contacts N' and N2', a microprocessor, a charging circuit, and an earbud battery. The wake-up principle is as follows: when the earbuds are placed in the charging case, the earbud charging contacts N' and N2' connect to the charging contacts N1 and N2 in the charging case, respectively. The rechargeable battery charges the earbuds through the charging contacts N1 and N2. The earbud microprocessor monitors the voltage of the charging contacts N' and N2'. When the microprocessor detects the presence of this voltage, it determines that the earbuds are inside the charging case, enters a sleep state, and begins charging. While in sleep mode, the microprocessor continuously monitors the voltage of the charging contacts N' and N2'. When the microprocessor detects the voltage disappearing, it determines that the earbuds have been removed from the charging case, waking the earbuds and putting them into working mode.
[0035] In addition, there is another wake-up scheme that uses the headphone microprocessor to detect the current at the charging contacts N' and N2'. Its principle is similar to the voltage wake-up scheme mentioned above, so it will not be elaborated here.
[0036] In summary, both voltage-based and current-based wake-up solutions rely on the charging case and earbuds working together to achieve wake-up. Therefore, a single earbud wake-up solution without a charging case is incompatible with existing earbud wake-up solutions.
[0037] In view of this, in the first aspect, this embodiment provides a wake-up circuit applied to a wireless Bluetooth headset; please refer to [link to relevant documentation]. Figure 2 The wake-up circuit includes:
[0038] The power supply module is used to provide the initial voltage;
[0039] A voltage control module, connected to the power supply module, is used to output a second voltage to the charging contacts of the earphone according to the first voltage. The voltage control module outputs the second voltage of different amplitudes when the charging contacts are in an open state and an open state.
[0040] A level conversion module, connected to the charging contact, is used to output a wake-up control level based on the third voltage of the charging contact; and
[0041] A control module, connected to the output of the level conversion module, is used to determine the headphone wake-up strategy based on the wake-up control level.
[0042] The first voltage can be the battery voltage provided by the built-in battery of the headphones, which is generally 3.3V.
[0043] The second voltage is less than or equal to the first voltage. Its amplitude can be obtained by designing a circuit to divide the voltage or adjusting the power output duty cycle according to specific needs. A voltage divider circuit is usually composed of multiple resistors connected in a certain way. Based on the characteristic that the voltage distribution in a series circuit is proportional to the resistance value, by reasonably selecting the resistance value, the first voltage can be distributed proportionally, thereby obtaining the second voltage with the required amplitude. In addition, by using pulse width modulation (PWM) technology, the on and off time ratio of the power switch is changed, that is, the duty cycle is adjusted. When the duty cycle changes, the average output voltage will also change accordingly, so the amplitude of the second voltage can be precisely controlled.
[0044] The third voltage is the voltage at the charging contacts. In the aforementioned wake-up circuit design, the amplitude of the second voltage differs between the open and connected states due to changes in the circuit topology. This substantial change in circuit topology directly affects the voltage at each node in the circuit. Under different circuit topologies, the amplitude of the second voltage will vary significantly, exhibiting different characteristics due to changes in the circuit structure. This solution uses this amplitude variation characteristic of the second voltage as the core basis for the headphone wake-up mechanism, providing a stable and reliable foundation for the headphone's intelligent wake-up.
[0045] In addition, the power supply module also provides the bias current and bias voltage required by each circuit of the earphone. These bias currents and bias voltages are used in many places in this embodiment. It is understood that such biasing is a conventional technical means, and the implementation methods and means such as parameter selection and specific circuit structure can be easily obtained by those skilled in the art. This embodiment and the corresponding drawings do not provide a detailed description.
[0046] The working principle of the wake-up circuit in this embodiment is as follows:
[0047] When the earbuds are outside the charging case, the second voltage is equal to the first voltage in the open circuit state, and the third voltage at the charging contacts is equal to the second voltage. The level conversion module outputs a high-level wake-up control level under the third voltage. When the earbuds are placed into the charging case, the amplitude of the second voltage decreases to less than the first voltage in the closed circuit state, and the third voltage at the charging contacts is equal to the second voltage. The level conversion module outputs a low-level wake-up control level under the third voltage. The control module detects the level conversion from high to low at the charging contacts, determines that the earbuds are in the charging case, and controls the earbuds to enter sleep mode.
[0048] When the earbuds are inside the charging case, the amplitude of the second voltage decreases in the closed-circuit state, becoming less than the first voltage. The third voltage at the charging contacts is equal to the second voltage, and the level conversion module outputs a low-level wake-up control level under the third voltage. When the earbuds are removed from the charging case, the amplitude of the second voltage increases, becoming equal to the first voltage in the open-circuit state. The third voltage at the charging contacts is equal to the second voltage, and the level conversion module outputs a high-level wake-up control level under the third voltage. The control module detects the level transition from low to high at the charging contacts, determines that the earbuds have been removed from the case, and wakes the earbuds up to enter the working state.
[0049] Based on the above working principle, the headphone wake-up strategy includes: a first wake-up strategy, which detects the level transition of the wake-up control level of the charging contact under the third voltage of different amplitudes according to the difference in the amplitude of the second voltage when the charging contact is disconnected and connected, so as to wake up the headphone.
[0050] Typically, a charging case serves not only as a container for earbuds but also as a charging medium. Even with a battery-free charging case design, which lacks built-in power storage and relies entirely on external power sources for charging, an external charging port remains essential. To achieve this core function, external power is connected to the internal circuitry of the charging case via the external charging port, transmitting power to the earbuds' charging contacts to replenish their batteries.
[0051] In addition, the wake-up circuit also needs to be compatible with the charging case containing the battery. Whether it is charged externally or by the battery in the charging case, the charging voltage is generally 5V.
[0052] Therefore, in a further embodiment, referring to Figure 2 As shown, the wake-up circuit further includes:
[0053] The DC detection module is connected to the power supply module, the charging contacts and the control module respectively, and is used to output a DC detection voltage according to the first voltage and the third voltage. The DC detection voltage is used to determine whether the earphone is in a charging environment.
[0054] The control module determines the headphone wake-up strategy based on the DC detection voltage and the wake-up control level.
[0055] The working principle of the wake-up circuit in the above embodiment is as follows:
[0056] When the earbuds are outside the charging case, the second voltage is equal to the first voltage in the open-circuit state, and the third voltage at the charging contacts is equal to the second voltage. The level conversion module outputs a high-level wake-up control level under the third voltage. When the earbuds are placed into the charging case, the amplitude of the second voltage decreases to less than the first voltage in the closed-circuit state. At the same time, the DC detection module outputs a DC detection voltage. If it is determined that the earbuds are in a charging environment, the third voltage at the charging contacts is the charging voltage, which is greater than the second voltage. At this time, the level conversion module outputs a high-level wake-up control level under this third voltage. Without a wake-up control level conversion, it is impossible to determine whether the earbuds are in or out of the case. However, based on the DC detection voltage, it can be directly determined that the earbuds are in the case, and the earbuds are controlled to enter a sleep state. If it is determined that the earbuds are in a non-charging environment, the third voltage at the charging contacts is equal to the second voltage. The level conversion module outputs a low-level wake-up control level under this third voltage. The control module detects the level conversion from high to low at the charging contacts, determines that the earbuds are in the case, and controls the earbuds to enter a sleep state.
[0057] When the earbuds are inside the charging case, the amplitude of the second voltage decreases in the closed-circuit state, becoming less than the first voltage. Simultaneously, the DC detection module outputs a DC detection voltage. If the earbuds are determined to be in a charging environment, the third voltage at the charging contacts is the charging voltage, which is greater than the second voltage. At this time, the level conversion module outputs a high-level wake-up control level under this third voltage. When the earbuds are removed from the charging case, the amplitude of the second voltage increases, becoming equal to the first voltage in the open-circuit state. The third voltage at the charging contacts equals the second voltage, and the level conversion module outputs a high-level wake-up control level under this third voltage. The wake-up control level remains high, and according to... The DC detection voltage can directly determine whether the earphones have been removed from the charging case and wake them up to enter working mode. If the earphones are determined to be in a non-charging environment, the third voltage at the charging contacts is equal to the second voltage, and the level conversion module outputs a low-level wake-up control level under the third voltage. When the earphones are removed from the charging case, the amplitude of the second voltage increases and equals the first voltage in the open circuit state. The third voltage at the charging contacts is equal to the second voltage, and the level conversion module outputs a high-level wake-up control level under the third voltage. The control module detects the level transition from low to high at the charging contacts, determines that the earphones have been removed from the charging case, and wakes them up to enter working mode.
[0058] Furthermore, when the earbuds are inside the charging case without batteries and are being charged externally, the third voltage at the charging contacts is the charging voltage, which is greater than the second voltage. At this time, the level conversion module outputs a high-level wake-up control level under this third voltage. When the external charging port is disconnected, the control module determines that the earbuds are in a non-charging environment based on the DC detection voltage. However, since the earbuds are still inside the charging case, the amplitude of the second voltage decreases in the closed-circuit state, becoming less than the first voltage. The third voltage at the charging contacts is equal to the second voltage, and the level conversion module outputs a low-level wake-up control level under the third voltage, keeping the earbuds in sleep mode. When the earbuds are removed from the case, the second voltage is equal to the first voltage in the open-circuit state, and the third voltage at the charging contacts is equal to the second voltage. The level conversion module outputs a high-level wake-up control level under the third voltage, determining that the earbuds have been removed from the case and waking them up to enter working mode.
[0059] Based on the above working principle, the headphone wake-up strategy further includes: a second wake-up strategy, which detects the level state of the wake-up control level output by the charging contact at the third voltage according to the magnitude of the DC detection voltage, so as to wake up the headphone.
[0060] Combining the working principles of the first and second wake-up strategies and the wake-up circuit, the control module determines the headphone wake-up strategy based on the DC detection voltage and the wake-up control level. Specifically, when the DC detection voltage determines that the headphone is in a charging environment, the control module executes the second wake-up strategy; when the DC detection voltage determines that the headphone is in a non-charging environment, the control module executes the first wake-up strategy.
[0061] The level conversion module in the above embodiment may not be accurate in level conversion near the critical value. Therefore, in order to improve the stability and accuracy of the judgment, in a further embodiment, the wake-up circuit further includes a pull-down module. The pull-down module is connected to the charging contact and the control module respectively, and is used to provide a pull-down when the DC detection voltage determines that the earphone is in a charging environment under the control of the control module.
[0062] The working principle of the wake-up circuit in the above embodiment is as follows:
[0063] When the earbuds are outside the charging case, the second voltage is equal to the first voltage in the open-circuit state, and the third voltage at the charging contacts is equal to the second voltage. The level conversion module outputs a high-level wake-up control level under the third voltage. When the earbuds are placed into the charging case, the amplitude of the second voltage decreases to less than the first voltage in the closed-circuit state. At the same time, the DC detection module outputs a DC detection voltage. If it is determined that the earbuds are in a charging environment, the third voltage at the charging contacts is the charging voltage, which is greater than the second voltage. At this time, the level conversion module outputs a high-level wake-up control level under this third voltage. Without a wake-up control level conversion, it is impossible to determine whether the earbuds are in or out of the case. However, based on the DC detection voltage, it can be directly determined that the earbuds are in the case, and the earbuds are controlled to enter a sleep state. If it is determined that the earbuds are in a non-charging environment, the third voltage at the charging contacts is equal to the second voltage. The level conversion module outputs a low-level wake-up control level under this third voltage. The control module detects the level conversion from high to low at the charging contacts, determines that the earbuds are in the case, and controls the earbuds to enter a sleep state.
[0064] When the earbuds are inside the charging case, the amplitude of the second voltage decreases in the closed-circuit state, becoming less than the first voltage. Simultaneously, the DC detection module outputs a DC detection voltage. If the earbuds are determined to be in a charging environment, the third voltage at the charging contacts becomes the charging voltage, which is greater than the second voltage. At this time, the level conversion module outputs a high-level wake-up control level under this third voltage. The control module determines that the earbuds are in a charging environment based on the DC detection voltage and enables the pull-down module to pull down the second voltage. When the earbuds are removed from the charging case, the amplitude of the second voltage increases, becoming equal to the first voltage in the open-circuit state. The third voltage at the charging contacts becomes less than the second voltage under the pull-down action of the pull-down module, and the level conversion module outputs a high-level wake-up control level. The level conversion module outputs a low-level wake-up control level under the third voltage to determine that the earphone has been removed from the charging case and wakes the earphone into working mode. If the earphone is determined to be in a non-charging environment, the third voltage at the charging contact is equal to the second voltage, and the level conversion module outputs a low-level wake-up control level under the third voltage. When the earphone is removed from the charging case, the amplitude of the second voltage increases and equals the first voltage in the open circuit state. The third voltage at the charging contact is equal to the second voltage, and the level conversion module outputs a high-level wake-up control level under the third voltage. The control module detects the level transition from low to high at the charging contact, determines that the earphone has been removed from the charging case, and wakes the earphone into working mode.
[0065] Furthermore, when the earbuds are inside the charging case without batteries and are being charged externally, the third voltage at the charging contacts is the charging voltage, which is greater than the second voltage. At this time, the level conversion module outputs a high-level wake-up control level under this third voltage. The control module determines that the earbuds are in a charging environment based on the DC detection voltage and enables the pull-down module to pull down the second voltage. When the external charging port is disconnected, the control module determines that the earbuds are in a non-charging environment based on the DC detection voltage and enables the pull-down module to disable the pull-down function. However, since the earbuds are still inside the charging case, the amplitude of the second voltage decreases in the closed-circuit state and becomes less than the first voltage. The third voltage at the charging contacts is equal to the second voltage, and the level conversion module outputs a low-level wake-up control level under the third voltage, keeping the earbuds in sleep mode. When the earbuds are removed from the case, the second voltage is equal to the first voltage in the open-circuit state, and the third voltage at the charging contacts is equal to the second voltage. The level conversion module outputs a high-level wake-up control level under the third voltage, determines that the earbuds have been removed from the case, and wakes the earbuds up to enter the working state.
[0066] As a specific embodiment, the voltage control module described above includes a current mirror circuit, the current mirror circuit comprising:
[0067] The first mirror branch is connected to the power supply module and forms a current source under the control of the enable signal of the control module;
[0068] The second mirror branch mirrors the current of the first mirror circuit and outputs the second voltage at the load terminal.
[0069] As an example, refer to Figure 3 As shown, the first mirror branch includes MOSFET P1 and multiple bias MOSFETs P3 and P4. The input terminal of MOSFET P1 is connected to the power supply module. The input terminals of multiple bias MOSFETs P3 and P4 connected in parallel are connected to the output terminal of MOSFET P1. The control terminals of multiple bias MOSFETs P3 and P4 are connected to the control module, forming a current source under the enable signals Ctrl_P3 and Ctrl_P4 of the control module. The second mirror branch includes MOSFET P2 and diode diol. MOSFET P2 and MOSFET P1 are mirrors of each other. The output terminal of MOSFET P2 is connected to one end of diode diol. The other end of diode diol outputs the second voltage VUSB_1. Another function of diode diol is to prevent the third voltage from flowing back into the second mirror branch and damaging the voltage control module when the headphones are in a charging environment.
[0070] As a specific embodiment, the level conversion module includes an inverter, the input terminal of which is connected to the charging contact, and outputs a wake-up control level according to the third voltage of the charging contact.
[0071] As an example, refer to Figure 4 As shown, the inverter includes MOSFETs P5 and N1 connected in series. Its input terminal is biased by the power supply module with a bias voltage Vbias1. Its control terminal is connected to the third voltage VUSB_2 of the charging contact. Its output terminal INBOX is connected to the control module.
[0072] In one specific embodiment, the DC detection module includes a comparison circuit, the first input terminal of the comparison circuit is connected to the first voltage, the second input terminal of the comparison circuit is connected to the third voltage, and the output terminal of the comparison circuit is connected to the control module.
[0073] As an example, refer to Figure 5 As shown, the comparator circuit includes a reference branch and an output branch. The reference branch includes MOSFETs P6 and P7 connected in series. The input terminal of MOSFET P6 is connected to the first voltage VBAT, and the output terminal is connected to the input terminal of MOSFET N2. The output branch includes MOSFETs P7 and N3 connected in series. The input terminal of MOSFET P7 is connected to the third voltage VUSB_2, and the output terminal is connected to the input terminal of MOSFET N3 and serves as the output terminal of the comparator circuit. The control terminals of MOSFETs P6 and P7 are connected, and the control terminals of MOSFETs N2 and N3 are connected to the control module. The bias voltage Vbias2 is provided by the aforementioned power supply module to form a fixed current source. When the third voltage VUSB_2 of the output branch is less than or equal to the first voltage VBAT of the reference circuit, the comparator circuit outputs a low level. When the third voltage VUSB_2 of the output branch is greater than the first voltage VBAT of the reference circuit, the comparator circuit outputs a high level.
[0074] As an example, refer to Figure 6 As shown, the pull-down module includes MOSFETs N4 and N6 forming a current mirror structure, and MOSFET N5 connected to the third voltage VUSB_2. MOSFETs N4 and N6, which form the current mirror structure, are connected to the power supply module and mirror the current to the charging contact under the action of bias current Ibias3. The control terminal of MOSFET N5 is connected to the control module and controls the switch of the pull-down function according to the enable signal Ctrl_N5.
[0075] In this embodiment, when the charging case is without power, the earbuds are powered by the earbuds themselves. The voltage control module controls the charging contacts to output different second voltages when they are disconnected from and connected to the charging case. These second voltages are converted to corresponding levels by the level conversion module. The earbuds can automatically wake up and start working by detecting the level conversion, which is compatible with existing charging cases without batteries. In addition, a DC detection module is designed to adapt to charging cases with charging conditions. By comparing the first voltage and the third voltage at the charging contacts, combined with the output level of the level conversion module, it is compatible with existing charging case solutions with batteries, making it flexible in use.
[0076] In a second aspect, this embodiment also provides a chip including the wake-up circuit described above.
[0077] In a third aspect, this embodiment also provides an electronic device, including the chip as described above.
[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; under the concept of this utility model, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this utility model as described above. For the sake of brevity, they are not provided in detail; although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A wake-up circuit, applied to a wireless Bluetooth headset, characterized in that, include: The power supply module is used to provide the initial voltage; A voltage control module, connected to the power supply module, is used to output a second voltage to the charging contacts of the earphone according to the first voltage. The voltage control module outputs the second voltage of different amplitudes when the charging contacts are in an open state and an open state. A level conversion module, connected to the charging contact, is used to output a wake-up control level according to the third voltage of the charging contact; as well as The DC detection module is connected to the power supply module and the charging contacts respectively, and is used to output a DC detection voltage according to the first voltage and the third voltage. The DC detection voltage is used to determine whether the earphone is in a charging environment. The control module is connected to the output of the level conversion module and the output of the DC detection module, and is used to determine the headphone wake-up strategy based on the wake-up control level and the DC detection voltage.
2. The wake-up circuit according to claim 1, characterized in that, The control module determines the headphone wake-up strategy based on the wake-up control level and the DC detection voltage, specifically as follows: When the DC detection voltage determines that the earphone is in a charging environment, the control module executes the second wake-up strategy; When the DC detection voltage determines that the earphone is in a non-charging environment, the control module executes the first wake-up strategy.
3. The wake-up circuit according to claim 2, characterized in that, The first wake-up strategy is as follows: Based on the difference in amplitude of the second voltage when the charging contact is disconnected and connected, the level transition of the wake-up control level corresponding to the third voltage at different amplitudes of the charging contact is obtained, and the earphone is woken up according to the level transition.
4. The wake-up circuit according to claim 2, characterized in that, The second wake-up strategy is as follows: Based on the magnitude of the DC detection voltage, the charging contact detects the wake-up control level of the third voltage output to wake up the headphones.
5. The wake-up circuit according to any one of claims 1-4, characterized in that, The voltage control module includes a current mirror circuit, which includes: The first mirror branch is connected to the power supply module and forms a current source under the control of the enable signal of the control module; The second mirror branch mirrors the current of the first mirror circuit and outputs the second voltage at the load terminal.
6. The wake-up circuit according to any one of claims 1-4, characterized in that, The level conversion module includes an inverter, the input terminal of which is connected to the charging contact, and outputs a wake-up control level based on the third voltage of the charging contact.
7. The wake-up circuit according to any one of claims 1-4, characterized in that, The DC detection module includes a comparison circuit. The first input terminal of the comparison circuit is connected to the first voltage, the second input terminal of the comparison circuit is connected to the third voltage, and the output terminal of the comparison circuit is connected to the control module.
8. A chip, characterized in that, Includes the wake-up circuit as described in any one of claims 1 to 7.
9. An electronic device, characterized in that, Includes the chip as described in claim 8.