Charging detection circuit, bluetooth charging device, and charging detection method

Abstract

The present application relates to the technical field of charging circuits, and relates to a charging detection circuit, comprising a control module, a charging module, a detection module, and a switch module. The control module is used for controlling a power supply to be transmitted to a battery of a Bluetooth charging device via the charging module for charging, receiving a charging state signal and / or an out-of-case state signal fed back by the detection module on the basis of the charging state and / or the out-of-case state of the Bluetooth charging device, and sending a control signal to the switch module on the basis of the charging state signal and / or the out-of-case state signal; the charging module is used for charging the battery of the Bluetooth charging device; the detection module is used for detecting the charging state and / or the out-of-case state of the Bluetooth charging device, generating the corresponding charging state signal and / or the corresponding out-of-case state signal, and feeding same back to the control module; the switch module is used for switching on or off on the basis of the control signal. The present application further relates to a Bluetooth charging device and a charging detection method. The technical solution provided by the present application can reduce the power consumption and prolong the battery life.

Description

Charging detection circuit, Bluetooth charging device and charging detection method Technical Field

[0001] The present application relates to the technical field of charging circuits, and more specifically, to a charging detection circuit, a Bluetooth charging device, and a charging detection method. Background Art

[0002] With the rapid development of science and technology, modern life is increasingly moving towards intelligent, low-power, miniaturized devices with long standby times, and Bluetooth devices have developed accordingly. Bluetooth devices are widely used, such as Bluetooth headsets, Bluetooth temperature sensors, and Bluetooth bracelets. They enable device interconnection, communication, and data transmission. Currently, Bluetooth devices are charged directly through the Bluetooth chip. After a full charge, the charging power source remains on, shortening the battery life and causing leakage during sleep mode.

[0003] Summary of the Invention

[0004] The technical problem to be solved by the embodiments of the present application is that in the related art, the Bluetooth device continues to be turned on after being fully charged, which affects the life of the rechargeable battery and causes power leakage during sleep.

[0005] In order to solve the above technical problems, the embodiment of the present application provides a charging detection circuit, which adopts the following technical solutions:

[0006] It includes a control module, a charging module, a detection module and a switch module, wherein the control module, the charging module, the detection module and the switch module are electrically connected;

[0007] The control module is configured to transmit the power supply to the battery of the Bluetooth charging device via the charging module to charge the battery, receive the charging status signal and / or the out-of-bay status signal fed back by the detection module based on the charging status and / or out-of-bay status of the Bluetooth charging device, and send a control signal to the switch module based on the charging status signal and / or the out-of-bay status signal;

[0008] The charging module is used to transmit the power supply to the battery of the Bluetooth charging device for charging;

[0009] The detection module is used to detect the charging status and / or out-of-warehouse status of the Bluetooth charging device, and generate the corresponding charging status signal and / or out-of-warehouse status signal to feed back to the control module;

[0010] The switch module is used to be turned on or off according to the control signal.

[0011] In order to solve the above technical problems, the embodiment of the present application further provides a Bluetooth charging device, which adopts the following technical solution:

[0012] The Bluetooth charging device uses the charging detection circuit described above to perform charging.

[0013] In order to solve the above technical problems, the embodiment of the present application further provides a charging detection method, which adopts the following technical solution:

[0014] The control module transmits the power supply to the charging module;

[0015] The charging module uses a power supply to charge the battery of the Bluetooth charging device;

[0016] The detection module detects the charging status of the Bluetooth charging device and generates a charging status signal to feed back to the control module;

[0017] The control module generates a corresponding control signal according to the charging state signal, and sends the control signal to the switch module;

[0018] The switch module is turned on or off according to the control signal.

[0019] Compared with the prior art, this application has the following beneficial effects:

[0020] The charging detection circuit provided in the present application charges the Bluetooth charging device through the charging module. During the charging process of the Bluetooth charging device, the detection module continuously detects the charging status of the Bluetooth charging device and feeds back the charging status signal to the control module. The control module controls the conduction or disconnection of the switch module according to the charging status signal. During the charging process of the Bluetooth charging device, the control module sends a control signal to control the switch module to turn on. After charging is completed, the control module sends a control signal to control the switch module to disconnect, so that the power supply stops supplying power to the battery of the Bluetooth charging device, which is beneficial to energy saving and reducing the power consumption of the rechargeable battery, avoiding leakage during sleep, and achieving the purpose of protecting the battery and extending the battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the solutions in this application, a brief introduction will be given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] FIG1 is a block diagram of a charging detection circuit of the present application;

[0023] FIG2 is a circuit diagram of an embodiment of a charging detection circuit of the present application;

[0024] FIG3 is a circuit schematic diagram of another embodiment of the charging detection circuit of the present application. DETAILED DESCRIPTION

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0026] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0027] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0028] An embodiment of the present application provides a charging detection circuit, as shown in Figure 1, including a control module 10, a charging module 20, a detection module 30 and a switch module 40, and the control module 10, the charging module 20, the detection module 30 and the switch module 40 are electrically connected.

[0029] Among them, the control module 10 is connected to the charging module 20, the detection module 30 and the switch module 40, and is used to transmit the power supply 50 to the battery of the Bluetooth charging device 60 for charging through the charging module 20, and receive the charging status signal or the out-of-warehouse status signal fed back by the detection module 30 according to the charging status or out-of-warehouse status of the Bluetooth charging device 60, and send a control signal to the switch module 40 according to the charging status signal or the out-of-warehouse status signal; the charging module 20 is connected to the detection module 30 through the Bluetooth charging device 60, and is used to transmit the power supply 50 to the battery of the Bluetooth charging device 60 for charging; the detection module 30 is used to detect the charging status or out-of-warehouse status of the Bluetooth charging device 60, and generate a corresponding charging status signal or out-of-warehouse status signal to feed back to the control module 10; the switch module 40 is used to turn on or off according to the control signal.

[0030] During the charging process, the charging module 20 generally charges the Bluetooth charging device 60 in a constant current and constant voltage mode. After charging is completed, the current detected by the detection module 30 decreases, that is, when the charging state is fully charged, the detected current is fed back to the control module 10 as a charging state signal. The control module 10 determines that the Bluetooth charging device 60 is fully charged according to the charging state signal, and then generates a shutdown control signal to send to the switch module 40. The switch module 40 performs a disconnection operation according to the shutdown control signal, so that the Bluetooth charging device 60 enters a sleep standby state. Since the control module 10 controls the switch module 40 to disconnect, the power supply to the battery of the Bluetooth charging device 60 is cut off, thereby protecting the battery, reducing power consumption in the sleep standby state, and avoiding the problem of leakage of the charging port.

[0031] When the Bluetooth charging device 60 leaves the warehouse (i.e., leaves the charging warehouse), the voltage quickly turns to 0, and the detection module 30 detects that the current quickly turns to 0, and transmits the current signal as the out-of-warehouse status signal to the control module 10. The control module 10 generates a control signal to control the switch module 40 to turn on according to the out-of-warehouse status signal, so that the switch module 40 turns on and waits for the next charging detection.

[0032] It should be understood that when the Bluetooth charging device 60 leaves the warehouse, that is, the load circuit has no load, which is equivalent to the load circuit being disconnected, there will be no leakage. At this time, the control switch module 40 is turned on, and when the Bluetooth charging device 60 returns to the warehouse, the charging status can be quickly detected to reduce the response time.

[0033] In some embodiments, as shown in FIG. 2 , the charging module 20 includes a voltage regulator chip U2 , an input pin VIN of the voltage regulator chip U2 is connected to the control module 10 , and an output pin VOUT of the voltage regulator chip U2 is connected to the battery of the Bluetooth charging device 60 .

[0034] Among them, the voltage regulator chip U2 adopts LDO voltage regulator chip to achieve stable voltage output.

[0035] In some embodiments, the charging module 20 further includes a diode D1, with the positive electrode of the diode D1 connected to the control module 10 and the negative electrode of the diode D1 connected to the input pin VIN of the voltage regulator chip U2. The diode D1 is used to prevent reverse connection of the charging power supply and protect the circuit.

[0036] In some embodiments, the charging module 20 further includes an enabling resistor R1 , a first end of the enabling resistor R1 is connected to the cathode of the diode D1 , and a second end of the enabling resistor R1 is connected to an enabling pin EN of the voltage stabilizing chip U2 .

[0037] Among them, when the enable pin EN is at a high level, the voltage regulator chip U2 works normally; when the enable pin EN is at a low level, the voltage regulator chip U2 stops working. The enable pin EN can be used to save power and extend battery life. At the same time, it can provide short-circuit protection with other pins of the voltage regulator chip U2 to prevent the chip from burning out.

[0038] In some embodiments, the charging module 20 also includes a first capacitor C1 and a second capacitor C2, the first end of the first capacitor C1 is connected to the negative electrode of the diode D1, and the second end of the first capacitor C1 is grounded; the first end of the second capacitor C2 is connected to the output pin VOUT of the voltage regulator chip U2, and the second end of the second capacitor C2 is grounded.

[0039] The first capacitor C1 and the second capacitor C2 play the role of anti-interference and filtering.

[0040] In some embodiments, the detection module 30 includes a first sampling unit 31 and a second sampling unit 32; the input end of the first sampling unit 31 is connected to the Bluetooth charging device 60 and the control module 10, and the output end of the first sampling unit 31 is grounded; the input end of the second sampling unit 32 is connected to the Bluetooth charging device 60 and the control module 10, and the output end of the second sampling unit 32 is connected to the switch module 40.

[0041] The first sampling unit 31 is used to detect the out-of-warehouse state of the Bluetooth charging device 60 , and the second sampling unit 32 is used to detect the charging state of the Bluetooth charging device 60 .

[0042] In some embodiments, the first sampling unit 31 is a first sampling resistor R2 , a first end of the first sampling resistor R2 is an input end of the first sampling unit 31 , and a second end of the first sampling resistor R2 is an output end of the first sampling unit 31 .

[0043] Specifically, a first end of the first sampling resistor R2 is connected to the Bluetooth charging device 60 and the control module 10. The first sampling resistor R2 is a high resistance resistor, for example, 47 kΩ.

[0044] When the Bluetooth charging device 60 leaves the warehouse, the voltage loaded across the first sampling resistor R2 quickly turns to 0, and the current passing through the first sampling resistor R2 with a high resistance value is also equivalent to 0. At this time, the switch module 40 is in the disconnected state, and the first sampling resistor R2 transmits the current signal as the out-of-warehouse state signal to the control module 10. The control module 10 controls the switch module 40 to turn on through the control signal; when the Bluetooth charging device 60 returns to the warehouse, the charging module 20 continues to charge the Bluetooth charging device 60, and the charging status is detected by the second sampling unit 32.

[0045] In some embodiments, the second sampling unit 32 includes a second sampling resistor R3 and a third sampling resistor R4. The first end of the second sampling resistor R3 serves as an input end of the second sampling unit 32. The second end of the second sampling resistor R3 is connected to the first end of the third sampling resistor R4. The second end of the third sampling resistor R4 serves as an output end of the second sampling unit 32. The second sampling resistor R3 and the third sampling resistor R4 are low-resistance resistors. For example, the second sampling resistor R3 has a resistance of 10Ω, and the third sampling resistor R4 has a resistance of 220Ω.

[0046] During the charging process of the Bluetooth charging device 60, the switch module 40 is in the on state, the first sampling resistor R2 is equivalent to a high-blocking disconnect, and the charging module 20 charges the Bluetooth charging device 60 with a stable output voltage. The output current of the Bluetooth charging device 60 is grounded through the second sampling resistor R3, the third sampling resistor R4, and the switch module 40. The current at the first end of the second sampling resistor R3 is also in a stable state, and the current signal at the first end of the second sampling resistor R3 is fed back to the control module 10 as a charging status signal. When the Bluetooth charging device 60 is fully charged, the output current of the Bluetooth charging device 60 decreases, and the current at the first end of the second sampling resistor R3 also decreases. The current change is fed back to the control module 10 as a charging status signal. The control module 10 sends a control signal to control the switch module 40 to be disconnected, so that the power supply cuts off the power supply to the Bluetooth charging device 60, thereby achieving the purpose of reducing the standby power consumption of the Bluetooth charging device 60, increasing the standby life of the Bluetooth charging device 60, and thus improving the user experience.

[0047] In some embodiments, the switch module 40 is a MOS transistor Q1 , a drain D of the MOS transistor Q1 is connected to the second end of the third sampling resistor R4 , a source S of the MOS transistor Q1 is grounded, and a gate G of the MOS transistor Q1 is connected to the control module 10 .

[0048] Among them, the MOS tube Q1 can be an N-type MOS tube.

[0049] When the control module 10 outputs a high-level control signal, the MOS transistor Q1 is turned on; when the control module 10 outputs a low-level control signal, the MOS transistor Q1 is turned off.

[0050] In some embodiments, as shown in FIG3 , the control module 10 includes a Bluetooth chip U1 , and the Bluetooth chip U1 includes a power input pin BTAVDD, a power output pin VBAT, a detection pin PA7 , and a switch control pin PA8 ;

[0051] The power input pin BTAVDD is connected to the power supply 50 , the power output pin VBAT is connected to the charging module 20 , the detection pin PA7 is connected to the detection module 30 , and the switch control pin PA8 is connected to the switch module 40 .

[0052] Specifically, the power output pin VBAT of the Bluetooth chip U1 is connected to the positive electrode of the diode D1 of the charging module 20; the detection pin PA7 is connected to the common connection point of the first end of the first sampling resistor R2 and the first end of the second sampling resistor R3; the switch control pin PA8 is connected to the gate of the MOS tube Q1.

[0053] In some embodiments, the control module 10 further includes a chip switching circuit 11 , which includes an input inductor L1 , a first end of which is connected to the power supply 50 , and a second end of which is connected to the switch pin SW of the Bluetooth chip U1 .

[0054] There is a switch inside the switch pin SW, which closes and closes at a certain frequency. As the switch is continuously opened and closed, the operating current is controlled within the preset current range, maintaining the stability of the output voltage, and can provide overload protection or short circuit protection for the Bluetooth chip U1.

[0055] In some embodiments, the control module 10 further includes a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, and a sixth capacitor C6.

[0056] A first end of the third capacitor C3 is connected to the power input pin BTAVDD of the Bluetooth chip U1, and a second end of the third capacitor C3 is grounded; a first end of the fourth capacitor C4 is connected to the power output pin VBAT of the Bluetooth chip U1, and a second end of the fourth capacitor C4 is grounded; first ends of the fifth capacitor C5 and the sixth capacitor C6 are respectively connected to the first end of the input inductor L1, and second ends of the fifth capacitor C5 and the sixth capacitor C6 are grounded.

[0057] The third capacitor C3, the fourth capacitor C4, the fifth capacitor C5 and the sixth capacitor C6 play the role of anti-interference and filtering.

[0058] In some embodiments, the charging detection circuit further includes an indicator light module 70 , which is connected to the Bluetooth chip U1 and is used to remind the user that the device is charging.

[0059] Among them, the indicator light module 70 includes a first light-emitting diode VD1, a second light-emitting diode VD2, a third light-emitting diode VD3 and a fourth light-emitting diode VD4, the cathodes of all light-emitting diodes are connected to the corresponding pins of the Bluetooth chip, and the anodes of all light-emitting diodes are connected to the output power 2_VBAT of the Bluetooth chip U1.

[0060] Specifically, the cathode of the first light-emitting diode VD1 is connected to the PA1 pin of the Bluetooth chip U1, the cathode of the second light-emitting diode VD2 is connected to the PA0 pin of the Bluetooth chip U1, the cathode of the third light-emitting diode VD3 is connected to the PB7 pin of the Bluetooth chip U1, and the cathode of the fourth light-emitting diode VD4 is connected to the PB6 pin of the Bluetooth chip U1.

[0061] In some embodiments, the indicator light module 70 further includes a fifth resistor R5 , a sixth resistor R6 , a seventh resistor R7 , and an eighth resistor R8 .

[0062] A fifth resistor R5 is connected between the anode of the first light-emitting diode VD1 and the output power supply 2_VBAT; a sixth resistor R6 is connected between the anode of the second light-emitting diode VD2 and the output power supply 2_VBAT; a seventh resistor R7 is connected between the anode of the third light-emitting diode VD3 and the output power supply 2_VBAT; and an eighth resistor R8 is connected between the anode of the fourth light-emitting diode VD4 and the output power supply 2_VBAT.

[0063] The fifth resistor R5 , the sixth resistor R6 , the seventh resistor R7 and the eighth resistor R8 are used for voltage division.

[0064] In some embodiments, the control module 10 also includes a clock crystal oscillator Y1, the first end N1 of the clock crystal oscillator Y1 is connected to the oscillator input pin BT_OSCI of the Bluetooth chip U1, the second end of the clock crystal oscillator Y1 is connected to the oscillator output pin BT_OSCO of the Bluetooth chip U1, and the ground ends GND1 and GND2 of the clock crystal oscillator Y1 are grounded.

[0065] A clock crystal oscillator Y1 is configured in the Bluetooth chip U1, and a clock signal is generated by the clock crystal oscillator Y1 to ensure that the chip works stably and reliably.

[0066] The charging detection circuit of the present application charges the Bluetooth charging device through the charging module. During the charging process of the Bluetooth charging device, the detection module continuously detects the charging status of the Bluetooth charging device and feeds back the charging status signal to the control module. The control module controls the conduction or disconnection of the switch module according to the charging status signal. After charging is completed, the control module sends a control signal to control the switch module to disconnect, so that the power supply stops supplying power to the battery of the Bluetooth charging device, which is beneficial to energy saving and reducing the power consumption of the rechargeable battery, thereby protecting the battery and extending the battery life.

[0067] The present application also provides a Bluetooth charging device 60, which uses the charging detection circuit as described above for charging.

[0068] In some embodiments, the Bluetooth charging device 60 includes a first Bluetooth unit and a second Bluetooth unit, the first Bluetooth unit and the second Bluetooth unit communicate with each other, and the first Bluetooth unit and the second Bluetooth unit are charged through the charging module 20.

[0069] Among them, the Bluetooth charging device 60 includes but is not limited to TWS headphones, wireless thermometers, etc.

[0070] Taking the Bluetooth charging device 60 as a TWS headset as an example, the first Bluetooth unit is the master headset, and the second Bluetooth unit is the slave headset. The charging detection circuit is set in a charging compartment that matches the TWS headset. Both the master headset and the slave headset are equipped with batteries. The battery of the master headset is electrically connected to the charging module 20 through TP1, and the battery of the slave headset is electrically connected to TP2. The charging detection circuit is used to charge the batteries of the master headset and the slave headset, so that the headset can be charged while being stored in the charging compartment, which is highly practical.

[0071] Based on the above charging detection circuit and Bluetooth charging device, the present application also provides a charging detection method, comprising the following steps:

[0072] Step S10, the control module 10 transmits the power supply 50 to the charging module 20;

[0073] Step S20, the charging module 20 uses the power supply 50 to charge the battery of the Bluetooth charging device 60;

[0074] Step S30: The detection module 30 detects the charging status and / or out-of-warehouse status of the Bluetooth charging device 60, and generates a charging status signal and / or out-of-warehouse status signal to feed back to the control module 10;

[0075] Step S40: The control module 10 generates a corresponding control signal according to the charging status signal and / or the out-of-bay status signal, and sends the control signal to the switch module 40;

[0076] In step S50 , the switch module 40 is turned on or off according to the control signal.

[0077] During the charging process, the switch control pin PA8 of the Bluetooth chip U1 of the control module 10 outputs a high level to the gate of the MOS transistor Q1. After receiving the high level, the MOS transistor Q1 is turned on. The power output pin VBAT of the Bluetooth chip U1 outputs a stable voltage to the charging module 20. The charging module 20 transmits the power supply through the voltage regulator chip U1 to output a stable voltage to charge the battery of the Bluetooth charging device 60. After charging is completed, the detection module 30 detects a decrease in current and feeds the reduced current as a charging status signal to the Bluetooth chip U1 through the detection pin PA7. The Bluetooth chip U1 determines that the Bluetooth charging device 60 is fully charged based on the charging status signal and transmits a low level signal to the gate of the MOS transistor Q1 through the switch control pin PA8. The MOS transistor Q1 is turned off after receiving the low level, thereby cutting off the charging circuit of the Bluetooth charging device 60. That is, the power supply to the battery of the Bluetooth charging device 60 is cut off. This avoids the problem of the power supply continuing to charge the battery after the battery is fully charged, reduces power consumption, and also avoids the problem of leakage at the charging port.

[0078] When the Bluetooth charging device 60 leaves the compartment (i.e., leaves the charging compartment), the voltage quickly turns to 0, and the detection module 30 detects that the current quickly turns to 0, and feeds the current signal as a leave-the-compartment status signal back to the Bluetooth chip U1 through the detection pin PA7. The Bluetooth chip U1 sends a high-level signal to the gate of the MOS tube Q1 according to the leave-the-compartment status signal, causing the MOS tube Q1 to turn on and wait for the next charging detection, thereby reducing the response time.

[0079] Obviously, the embodiments described above are only some of the embodiments of the present application, rather than all of the embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions described in the aforementioned specific embodiments, or to make equivalent replacements for some of the technical features therein. Any equivalent structure made using the contents of the present application specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present application.

Claims

1. A charging detection circuit, characterized in that: include: A control module, a charging module, a detection module and a switch module, wherein the control module, the charging module, the detection module and the switch module are electrically connected; The control module is used to transmit the power supply to the battery of the Bluetooth charging device through the charging module to charge the battery, and receive the charging status signal and / or the out-of-warehouse status signal fed back by the detection module according to the charging status and / or out-of-warehouse status of the Bluetooth charging device, and send a control signal to the switch module according to the charging status signal and / or the out-of-warehouse status signal; The charging module is used to transmit the power supply to the battery of the Bluetooth charging device for charging; The detection module is used to detect the charging state and / or out-of-warehouse state of the Bluetooth charging device, and generate the corresponding charging state signal and / or out-of-warehouse state signal to feed back to the control module; The switch module is used to be turned on or off according to the control signal.

2. The charging detection circuit according to claim 1, characterized in that: The charging module comprises a voltage stabilizing chip, an input pin of the voltage stabilizing chip is connected to the control module, and an output pin of the voltage stabilizing chip is connected to the battery of the Bluetooth charging device.

3. The charging detection circuit according to claim 2, characterized in that: The charging module further comprises a diode, the anode of the diode is connected to the control module, and the cathode of the diode is connected to the input pin of the voltage stabilizing chip.

4. The charging detection circuit according to claim 3, characterized in that: The charging module further includes an enabling resistor, a first end of the enabling resistor is connected to the cathode of the diode, and a second end of the enabling resistor is connected to an enabling pin of the voltage stabilizing chip.

5. The charging detection circuit according to claim 4, characterized in that: The charging module further includes a first capacitor and a second capacitor, wherein a first end of the first capacitor is connected to the cathode of the diode, and a second end of the first capacitor is grounded; A first end of the second capacitor is connected to an output pin of the voltage stabilizing chip, and a second end of the second capacitor is grounded.

6. The charging detection circuit according to claim 1, characterized in that: The detection module includes a first sampling unit and a second sampling unit; The input end of the first sampling unit is connected to the Bluetooth charging device and the control module, and the output end of the first sampling unit is grounded; An input end of the second sampling unit is connected to the Bluetooth charging device and the control module, and an output end of the second sampling unit is connected to the switch module.

7. The charging detection circuit according to claim 6, characterized in that: The first sampling unit is a first sampling resistor, a first end of the first sampling resistor is an input end of the first sampling unit, and a second end of the first sampling resistor is an output end of the first sampling unit.

8. The charging detection circuit according to claim 6, characterized in that: The second sampling unit includes a second sampling resistor and a third sampling resistor, the first end of the second sampling resistor is the input end of the second sampling unit, the second end of the second sampling resistor is connected to the first end of the third sampling resistor, and the second end of the third sampling resistor is the output end of the second sampling unit.

9. The charging detection circuit according to claim 8, characterized in that: The switch module is a MOS tube, the drain of the MOS tube is connected to the second end of the third sampling resistor, the source of the MOS tube is grounded, and the gate of the MOS tube is connected to the control module.

10. The charging detection circuit according to claim 1, characterized in that: The control module includes a Bluetooth chip, and the Bluetooth chip includes a power input pin, a power output pin, a detection pin, and a switch control pin; The power input pin is connected to the power supply, the power output pin is connected to the charging module, the detection pin is connected to the detection module, and the switch control pin is connected to the switch module.

11. The charging detection circuit according to claim 10, characterized in that: The control module further includes a chip switch circuit, which includes an input inductor, a first end of which is connected to the power supply, and a second end of which is connected to a switch pin of the Bluetooth chip.

12. The charging detection circuit according to claim 11, characterized in that: The control module also includes a third capacitor, a fourth capacitor, a fifth capacitor and a sixth capacitor; A first end of the third capacitor is connected to a power input pin of the Bluetooth chip, and a second end of the third capacitor is grounded; A first end of the fourth capacitor is connected to a power output pin of the Bluetooth chip, and a second end of the fourth capacitor is grounded; The first ends of the fifth capacitor and the sixth capacitor are respectively connected to the first end of the input inductor, and the second ends of the fifth capacitor and the sixth capacitor are grounded.

13. The charging detection circuit according to claim 10, characterized in that: The charging detection circuit also includes an indicator light module, and the indicator light module is connected to the Bluetooth chip.

14. The charging detection circuit according to claim 13, characterized in that: The indicator light module includes a first light-emitting diode, a second light-emitting diode, a third light-emitting diode and a fourth light-emitting diode; the cathodes of the first light-emitting diode, the second light-emitting diode, the third light-emitting diode and the fourth light-emitting diode are respectively connected to the corresponding pins of the Bluetooth chip; the anodes of the first light-emitting diode, the second light-emitting diode, the third light-emitting diode and the fourth light-emitting diode are respectively connected to the output power supply of the Bluetooth chip.

15. The charging detection circuit according to claim 14, characterized in that: The indicator light module further includes a fifth resistor, a sixth resistor, a seventh resistor and an eighth resistor; The fifth resistor is connected between the positive electrode of the first light emitting diode and the output power supply; The sixth resistor is connected between the anode of the second light emitting diode and the output power supply; The seventh resistor is connected between the anode of the third light emitting diode and the output power supply; The eighth resistor is connected between the anode of the fourth light emitting diode and the output power supply.

16. The charging detection circuit according to claim 10, characterized in that: The control module also includes a clock crystal oscillator, a first end of the clock crystal oscillator is connected to the oscillator input pin of the Bluetooth chip, a second end of the clock crystal oscillator is connected to the oscillator output pin of the Bluetooth chip, and a ground end of the clock crystal oscillator is grounded.

17. A Bluetooth charging device, characterized in that: The Bluetooth charging device is charged using the charging detection circuit according to any one of claims 1 to 16.

18. The Bluetooth charging device according to claim 17, characterized in that: The Bluetooth charging device includes a first Bluetooth unit and a second Bluetooth unit, the first Bluetooth unit and the second Bluetooth unit communicate with each other, and the first Bluetooth unit and the second Bluetooth unit are charged through the charging module.

19. A charging detection method, characterized in that: The following steps are involved: The control module transmits the power supply to the charging module; The charging module uses a power supply to charge the battery of the Bluetooth charging device; The detection module detects the charging status of the Bluetooth charging device and generates a charging status signal to feed back to the control module; The control module generates a corresponding control signal according to the charging state signal, and sends the control signal to the switch module; The switch module is turned on or off according to the control signal.

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