Earphone electric quantity detection circuit and Bluetooth earphone thereof

Abstract

The utility model relates to the technical field of Bluetooth earphones, in particular to an earphone electric quantity detection circuit and a Bluetooth earphone thereof. Comprising an input module, a voltage dividing module, a master control module, a driving module and a display module, the input module is provided with a first connection PIN connected with a left earphone battery and a second connection PIN connected with a right earphone battery, the output end of the input module is connected with the input end of the voltage dividing module, the output end of the voltage dividing module is connected with the ADC detection end of the master control module, and the display module is connected with the master control module. The output end of the main control module is connected with the input end of the driving module, and the output end of the driving module is connected with the display module; a first connection PIN and a second connection PIN are arranged on an input module, and a left earphone battery and a right earphone battery are directly led into an ADC detection port of a charging bin main control module through the first connection PIN and the second connection PIN respectively so as to carry out voltage detection; the process does not need the participation of an earphone controller, and the interaction between the charging bin and the earphone is reduced, so that the electric quantity detection is more stable and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of Bluetooth earphones, in particular to an earphone power detection circuit and a Bluetooth earphone thereof. Background Art

[0002] Bluetooth headsets are hands-free headsets that apply Bluetooth technology, allowing users to avoid the entanglement of annoying wires and make calls easily in a variety of ways. Since the advent of Bluetooth headsets, they have been a good tool for mobile business people to improve efficiency. In some demand scenarios, in order to facilitate users to charge the headsets in time, the charging case is needed to obtain the power of the left and right headsets and indicate it through the LED on the charging case.

[0003] The existing acquisition method is generally to obtain the battery power of the left and right earphones respectively through the self-controllers of the left and right earphones, and to transmit the battery power information of the left and right earphones by interacting the self-controllers of the left and right earphones with the main controller in the charging case; this process requires the participation of the earphone's own control module, and there are many interactions between the earphones and the charging case, which makes there are more unstable factors in the power acquisition process, which can easily cause the hidden danger of inaccurate power acquisition or acquisition failure.

[0004] Therefore, it is very important for those skilled in the art to design an earphone power detection circuit and a Bluetooth earphone that can stably obtain the earphone power without the involvement of the earphone's own control module. Utility Model Content

[0005] The technical problem to be solved by the embodiments of the utility model is to provide a headphone power detection circuit and a Bluetooth headset that can stably obtain the headphone power without the participation of the headphone's own control module, so as to solve the problem in the prior art that there are many interactions between the headphone and the charging case, which easily leads to the hidden danger of inaccurate power acquisition or failed acquisition.

[0006] The utility model discloses an earphone power detection circuit, which comprises: an input module, a voltage dividing module, a main control module, a driving module and a display module. The input module is provided with a first connection PIN pin and a second connection PIN pin. The first connection PIN pin is used to connect with a left earphone battery to obtain the left earphone battery voltage. The second connection PIN pin is used to connect with a right earphone battery to obtain the right earphone battery voltage. The output end of the input module is connected with the input end of the voltage dividing module. The output end of the voltage dividing module is connected with the ADC detection end of the main control module. The output end of the main control module is connected with the input end of the driving module. The output end of the driving module is connected with the display module.

[0007] Optionally, the voltage divider module includes a first voltage divider circuit and a second voltage divider circuit, the input end of the first voltage divider circuit is connected to the first connection PIN pin, the input end of the second voltage divider circuit is connected to the second connection PIN pin, and the output end of the first voltage divider circuit is connected to the ADC detection end of the main control module.

[0008] Optionally, the first voltage-dividing circuit includes a first voltage-dividing resistor and a first electrostatic protection tube, one end of the first voltage-dividing resistor is connected to the first connection PIN pin, the other end of the first voltage-dividing resistor is respectively connected to the ADC detection end of the main control module and one end of the first electrostatic protection tube, and the other end of the first electrostatic protection tube is grounded.

[0009] Optionally, the first voltage-dividing circuit further includes a first filter resistor and a first filter capacitor, and the first filter resistor and the first filter capacitor are both connected in parallel with the first electrostatic protection tube.

[0010] Optionally, the second voltage-dividing circuit includes a second voltage-dividing resistor and a second electrostatic protection tube, one end of the second voltage-dividing resistor is connected to the second connection PIN pin, the other end of the second voltage-dividing resistor is respectively connected to the ADC detection end of the main control module and one end of the second electrostatic protection tube, and the other end of the second electrostatic protection tube is grounded.

[0011] Optionally, the second voltage-dividing circuit further includes a second filter resistor and a second filter capacitor, and both the second filter resistor and the second filter capacitor are connected in parallel with the second electrostatic protection tube.

[0012] Optionally, the main control module includes a main control chip, and the main control module includes a first detection pin and a second detection pin as ADC detection terminals.

[0013] Optionally, the output end of the main control module and the input end of the driving module are connected via an I2C bus.

[0014] Optionally, the display module includes at least two LED lights.

[0015] In order to solve the problems existing in the prior art, the utility model also provides a Bluetooth headset, which comprises a left earphone, a right earphone and a charging compartment, wherein the charging compartment is provided with the earphone power detection circuit as described above.

[0016] Compared with the prior art, the beneficial effect of the headphone power detection circuit provided by the embodiment of the utility model is that: by designing a headphone power detection circuit, specifically by setting a first connection PIN pin and a second connection PIN pin on the input module, the left headphone battery and the right headphone battery are directly introduced into the ADC detection port of the charging bin main control module through the first connection PIN pin and the second connection PIN pin respectively, so as to perform left headphone battery voltage detection and right headphone voltage detection. After the detection, the main control module controls the driving module to drive the display module to perform corresponding display according to the corresponding voltage; the detection process does not require the participation of the headphone's own controller, and the interaction between the charging bin and the headphone is reduced, thereby reducing unstable factors, making the power detection more stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The technical solution of the utility model will be further described in detail below with reference to the accompanying drawings and embodiments, in which:

[0018] Figure 1 The system frame of the earphone power detection circuit provided by the embodiment of the utility model Figure 1 ;

[0019] Figure 2 The system frame of the earphone power detection circuit provided by the embodiment of the utility model Figure 2 ;

[0020] Figure 3 is a circuit diagram of an input module provided by an embodiment of the utility model;

[0021] Figure 4 is a circuit diagram of a voltage divider module provided in an embodiment of the utility model;

[0022] Figure 5 It is a circuit diagram of the main control chip provided by the embodiment of the utility model. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Now, in conjunction with the accompanying drawings, a preferred embodiment of the present utility model is described in detail.

[0024] like Figures 1 to 4 As shown, the utility model provides a specific embodiment of an earphone power detection circuit.

[0025] A headphone power detection circuit, reference Figure 1The earphone power detection circuit includes an input module 100, a voltage divider module 200, a main control module 300, a driving module 400 and a display module 500. The input end of the input module 100 is connected to the left earphone battery and the right earphone battery respectively, the output end of the input module 100 is connected to the input end of the voltage divider module 200, the output end of the voltage divider module 200 is connected to the input end of the main control module 300, the output end of the main control module 300 is connected to the input end of the driving module 400, and the output end of the driving module 400 is connected to the input end of the display module 500.

[0026] Specifically, refer to Figure 1 The input end of the input module 100 is used to connect the left earphone battery and the right earphone battery to obtain the left earphone battery voltage and the right earphone battery voltage; the output end of the input module 100 is connected to the input end of the voltage divider module 200, so that the left earphone battery voltage and the right earphone battery voltage are stepped down through the voltage divider module 200 and the left earphone battery voltage and the right earphone battery voltage are both within the specification range of the ADC detection of the main control module 300. The output end of the voltage divider module 200 is connected to the ADC detection end on the main control module 300 to transmit the left earphone battery voltage signal and the right earphone battery voltage signal to the main control module 300, and the left earphone battery power and the right earphone battery power are collected through the main control module 300.

[0027] Further, refer to Figure 1 The output end of the main control module 300 is connected to the input end of the driving module 400 for sending a driving control instruction, and the output end of the driving module 400 is connected to the display module 500 to drive the display module 500 to display accordingly.

[0028] The specific display mode of the display module 500 can be pre-set according to actual conditions. In this embodiment, when the ADC end of the main control module 300 collects the battery power of the left earphone, if the battery power of the left earphone is 0-40%, a corresponding control signal is sent to the driving module 400, so that the driving module 400 drives the first indicator light in the display module 500 to breathe; if the battery power of the left earphone is 40%-90%, a corresponding control signal is sent to the driving module 400, so that the driving module 400 drives the second indicator light in the display module 500 to breathe; if the battery power of the left earphone is greater than 90%, a corresponding control signal is sent to the driving module 400, so that the second indicator light in the display module 500 of the driving module 400 is always on. The control principle of obtaining the power of the right earphone is the same as that of the left earphone.

[0029] Among them, reference Figures 1 to 3The input module 100 is provided with a first connection PIN pin 110 and a second connection PIN pin 120. The first connection PIN pin 110 is used to connect to the left earphone battery. When the left earphone is placed in the charging compartment, the first connection PIN pin 110 is directly electrically connected to the gasket connected to the left earphone battery to obtain the left earphone battery voltage. The second connection PIN pin 120 is used to connect to the right earphone battery. When the right earphone is placed in the charging compartment, the second connection PIN pin 120 is directly electrically connected to the gasket connected to the right earphone battery to obtain the right earphone battery voltage.

[0030] In the prior art, the battery power of the left and right earphones is generally obtained respectively through the self-controllers of the left and right earphones, and the battery power information of the left and right earphones is transmitted by interacting the self-controllers of the left and right earphones with the main controller in the charging case. This process requires the participation of the earphone's own control module, and there are many interactions between the earphones and the charging case, which makes there are many unstable factors in the power acquisition process, which easily leads to the hidden danger of inaccurate power acquisition or failed acquisition.

[0031] In this embodiment, an earphone power detection circuit is designed, specifically by setting a first connection PIN pin and a second connection PIN pin on the input module, the left earphone battery and the right earphone battery are directly introduced into the ADC detection port of the charging bin main control module through the first connection PIN pin and the second connection PIN pin respectively, so as to perform left earphone battery voltage detection and right earphone voltage detection. After the detection, the main control module controls the driving module to drive the display module to perform corresponding display according to the corresponding voltage; the detection process does not require the participation of the earphone's own controller, and the interaction between the charging bin and the earphone is reduced, thereby reducing unstable factors, making the power detection more stable and reliable.

[0032] In one embodiment, reference Figure 1 , Figure 2 and Figure 4 The voltage divider module 200 includes a first voltage divider circuit 210 and a second voltage divider circuit 220. The input end of the first voltage divider circuit 210 is connected to the first connection PIN pin 110, the input end of the second voltage divider circuit 220 is connected to the second connection PIN pin 120, and the output end of the first voltage divider circuit 210 is connected to the ADC detection end of the main control module 300.

[0033] Specifically, refer to Figure 1 , Figure 2 and Figure 4The first voltage-dividing circuit 210 includes a first voltage-dividing resistor R40, a first filter resistor R46, a first filter capacitor C29 and a first electrostatic protection tube E3. One end of the first voltage-dividing resistor R40 is connected to the first connection PIN pin 110, and the other end of the first voltage-dividing resistor R40 is connected to the ADC detection end of the main control module 300. The first filter resistor R46 and the first filter capacitor C29 both have a filtering function. One end of the first filter resistor R46 is connected between the first voltage-dividing resistor R40 and the ADC detection end of the main control module 300, and the other end of the first filter resistor R46 is grounded. One end of the first filter capacitor C29 is also connected between the first voltage-dividing resistor R40 and the ADC detection end of the main control module 300, and the other end of the first filter capacitor C29 is grounded. One end of the first electrostatic protection tube E3 is also connected between the first voltage-dividing resistor R40 and the ADC detection end of the main control module 300, and the other end of the first electrostatic protection tube E3 is grounded.

[0034] The first filter capacitor C29 can be used to construct a low-pass filter or a high-pass filter. In the low-pass filter, it allows low-frequency signals to pass through and blocks high-frequency signals, while in the high-pass filter, it allows high-frequency signals to pass through and blocks low-frequency signals. The first filter capacitor C29 can also be used to remove the DC component so that the electrical signal can be concentrated on the AC component. It is used to smooth the left earphone battery voltage to reduce voltage fluctuations; the first electrostatic protection tube E3 is used to prevent electrostatic discharge from damaging circuit components, thereby ensuring the stability of the interface.

[0035] Further, refer to Figure 1 , Figure 2 and Figure 4 The second voltage-dividing circuit 220 includes a second voltage-dividing resistor R36, a second filter resistor R37, a second filter capacitor C18 and a second electrostatic protection tube E2. One end of the second voltage-dividing resistor R36 is connected to the second connection PIN pin 120, and the other end of the second voltage-dividing resistor R36 is connected to the ADC detection end of the main control module 300. The second filter resistor R37 and the second filter capacitor C18 both have a filtering function. One end of the second filter resistor R37 is connected between the second voltage-dividing resistor R36 and the ADC detection end of the main control module 300, and the other end of the second filter resistor R37 is grounded. One end of the second filter capacitor C18 is also connected between the second voltage-dividing resistor R36 and the ADC detection end of the main control module 300, and the other end of the second filter capacitor C18 is grounded. One end of the second electrostatic protection tube E2 is also connected between the second voltage-dividing resistor R36 and the ADC detection end of the main control module 300, and the other end of the second electrostatic protection tube E2 is grounded.

[0036] The second filter capacitor C18 can be used to construct a low-pass filter or a high-pass filter. In the low-pass filter, it allows low-frequency signals to pass through and blocks high-frequency signals, while in the high-pass filter, it allows high-frequency signals to pass through and blocks low-frequency signals. The second filter capacitor C18 can also be used to remove the DC component so that the electrical signal can be concentrated on the AC component. It is used to smooth the left earphone battery voltage to reduce voltage fluctuations. The second electrostatic protection tube E2 is used to prevent electrostatic discharge from damaging circuit components, thereby ensuring the stability of the interface.

[0037] In one embodiment, reference Figure 1 , Figure 2 and Figure 5 The main control module 300 includes a main control chip 310, and the main control module 300 includes a first detection pin L_EARBUD_BAT_AD and a second detection pin R_EARBUD_BAT_AD as an ADC detection end.

[0038] Specifically, refer to Figure 1 , Figure 2 and Figure 5 The main control chip 310 includes a first detection pin L_EARBUD_BAT_AD and a second detection pin R_EARBUD_BAT_AD; the first detection pin L_EARBUD_BAT_AD is connected to the output end of the first voltage divider circuit 210 to collect the left earphone battery voltage; the second detection pin R_EARBUD_BAT_AD is connected to the output end of the second voltage divider circuit 220 to collect the right earphone battery voltage.

[0039] Further, refer to Figure 1 , Figure 2 and Figure 5 The output end of the main control module 300 and the input end of the driving module 400 are connected through the I2C bus. The main control chip 310 is correspondingly provided with C_I2C_SDA pin, C_I2C_SCL pin and C_I2C_SDB pin for connecting to the I2C bus, thereby realizing connection with the driving module 400 for communication.

[0040] The I2C bus is a serial communication protocol, which includes a serial data line SDA for transmitting data and a serial clock line SCL for transmitting a clock signal. Generally speaking, there is usually a master device and one or more slave devices in the I2C bus. In this embodiment, the main control module 300 is the master device, and the two receiving ends on the driver module 400 for receiving the left earphone power display drive control signal and the right earphone power display drive control signal can be used as two slave devices to be connected to the C_I2C_SDA pin and the C_I2C_SDB pin respectively.

[0041] In one embodiment, the display module 500 includes at least two LED lights, specifically including an LED orange light and an LED white light. The specific display mode of the LED orange light and the LED white light can be pre-set according to actual conditions. For example, when the battery power of the left earphone is 0-40%, the LED orange light breathes; when the battery power of the left earphone is 40%-90%, the LED white light breathes; when the battery power of the left earphone is greater than 90%, the LED white light is always on.

[0042] In order to solve the problems existing in the prior art, the utility model also provides a Bluetooth headset, which includes a left earphone, a right earphone and a charging compartment, and the charging compartment is provided with the earphone power detection circuit as described above.

[0043] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present utility model rather than to limit it. For those skilled in the art, the technical solutions described in the above embodiments can be modified, or some of the technical features therein can be replaced by equivalents; and all these modifications and replacements should fall within the scope of protection of the claims attached to the present utility model.

Claims

1. A headphone power detection circuit, characterized in that: include: An input module, a voltage divider module, a main control module, a driving module and a display module, wherein the input module is provided with a first connection PIN pin and a second connection PIN pin, the first connection PIN pin is used to connect to a left earphone battery to obtain the left earphone battery voltage, the second connection PIN pin is used to connect to a right earphone battery to obtain the right earphone battery voltage, the output end of the input module is connected to the input end of the voltage divider module, the output end of the voltage divider module is connected to the ADC detection end of the main control module, the output end of the main control module is connected to the input end of the driving module, and the output end of the driving module is connected to the display module.

2. The earphone power detection circuit according to claim 1, characterized in that: The voltage divider module includes a first voltage divider circuit and a second voltage divider circuit, the input end of the first voltage divider circuit is connected to the first connection PIN pin, the input end of the second voltage divider circuit is connected to the second connection PIN pin, and the output end of the first voltage divider circuit is connected to the ADC detection end of the main control module.

3. The earphone power detection circuit according to claim 2, characterized in that: The first voltage-dividing circuit includes a first voltage-dividing resistor and a first electrostatic protection tube, one end of the first voltage-dividing resistor is connected to the first connection PIN pin, the other end of the first voltage-dividing resistor is respectively connected to the ADC detection end of the main control module and one end of the first electrostatic protection tube, and the other end of the first electrostatic protection tube is grounded.

4. The earphone power detection circuit according to claim 3, characterized in that: The first voltage divider circuit also includes a first filter resistor and a first filter capacitor, and the first filter resistor and the first filter capacitor are both connected in parallel with the first electrostatic protection tube.

5. The earphone power detection circuit according to claim 4, characterized in that: The second voltage-dividing circuit includes a second voltage-dividing resistor and a second electrostatic protection tube, one end of the second voltage-dividing resistor is connected to the second connection PIN pin, the other end of the second voltage-dividing resistor is respectively connected to the ADC detection end of the main control module and one end of the second electrostatic protection tube, and the other end of the second electrostatic protection tube is grounded.

6. The earphone power detection circuit according to claim 5, characterized in that: The second voltage divider circuit further includes a second filter resistor and a second filter capacitor, and both the second filter resistor and the second filter capacitor are connected in parallel with the second electrostatic protection tube.

7. The earphone power detection circuit according to claim 1, characterized in that: The main control module comprises a main control chip, and the main control module comprises a first detection pin and a second detection pin as an ADC detection end.

8. The earphone power detection circuit according to claim 1, characterized in that: The output end of the main control module and the input end of the driving module are connected via an I2C bus.

9. The earphone power detection circuit according to claim 1, characterized in that: The display module includes at least two LED lamps.

10. A Bluetooth headset, characterized in that: It comprises a left earphone, a right earphone and a charging compartment, wherein the charging compartment is provided with an earphone power detection circuit as described in any one of claims 1 to 9.

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