Charging management circuit and wireless earphone system

Abstract

The utility model discloses a charging management circuit and wireless earphone system, including: charging module and equipment module, the charging module includes rechargeable battery B1, master control unit, booster circuit, battery charger and voltage detection circuit, the equipment module includes equipment battery B2, the input end of booster circuit is electrically connected with rechargeable battery B1, the output end of booster circuit is electrically connected with battery charger, and the voltage detection circuit is electrically connected with the equipment battery B2. The output end of the booster circuit is electrically connected with the input end of the battery charger, the main control unit is electrically connected with the control end of the booster circuit, the output end of the battery charger charges the equipment battery B2, and the voltage detection circuit is used for detecting the output voltage of the battery charger. The booster circuit is used for receiving the output voltage of the battery charger and feeding back the output voltage to the main control unit, the main control unit can judge the input voltage requirement of the battery charger according to the output voltage, and the main control unit controls the booster circuit to output target voltage meeting the input voltage requirement of the battery charger. And voltage reduction and recharging in the battery charger are not needed, so that the charging efficiency is improved, and the power consumption is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to wireless earphone charging technical field, especially a kind of charging management circuit and wireless earphone system. BACKGROUND

[0002] With the continuous development of intelligent wearable device market, among them, TWS (True Wireless Stereo) true wireless Bluetooth earphone product is widely loved by consumers, and the TWS Bluetooth earphone works by providing energy by itself with battery, when the battery is low, it needs to be charged by external power supply, generally, the product will be equipped with charging warehouse, after the TWS Bluetooth earphone is put into the charging warehouse, the charging warehouse converts the energy of the warehouse battery to 5V through the boost chip and outputs to the TWS Bluetooth earphone for charging, and the TWS Bluetooth earphone charges the earphone battery through the built-in linear charger. In the mainstream TWS Bluetooth earphone in the market, a linear charger is integrated, when the linear charger works, the internal resistance of the current path of the charger is adjusted through negative feedback loop, and the output current is basically consistent with the input current, there is a large voltage difference on the internal path of the charger, so as to realize the step-down charging of the battery, which means that a large part of the input energy is consumed on the charger, and the disadvantage is that a large part of the input energy is dissipated in the form of heat, and the volume of the general earphone is small and the heat dissipation capacity is poor, in order to ensure the safety of users, the earphone is generally charged with small current to reduce the heat, that is, the charging speed of the earphone is limited, and the efficiency is very low. Figure 1The existing commonly used TWS charging bin and earphone charging system. The system includes a TWS charging bin and two TWS earphones; the working principle and process of the system is: when starting to charge the earphone, the TWS bin control logic controls the boost circuit to boost to 5V, and simultaneously opens two output channels to output 5V power supply; the two TWS earphones are respectively connected to the two output channels of the bin, and the linear charger in the TWS earphone reduces the 5V output by the charging bin and charges the earphone battery through the lithium battery protector; wherein the output channel part of the TWS bin has a current detection function, which judges whether the earphone is charging or the earphone is full by detecting the size of the current. For example, in the system, the TWS charging bin has a bin battery of 3.3V, outputs a fixed voltage of 5V through a boost circuit, the TWS earphone accepts a fixed input voltage of 5V, and the linear charger outputs 3.3V voltage battery charging. When the linear charger works, the output current and the input current are basically consistent, such as 40mA, and the internal resistance of the current path of the charger is adjusted through a negative feedback loop to realize voltage reduction. Then the input voltage of 5V on the internal path of the charger is reduced by 1.7V voltage difference of the battery voltage of 3.3V, and the power dissipated by the linear charger is equal to the voltage multiplied by the current, that is, 68mW. This part of the loss is dissipated in the form of heat, which cannot be dissipated in time due to the size limitation of the TWS earphone. In order to ensure the safety of the user, the charging current is generally not increased, so as to limit the heat generation, that is, the charging speed of the earphone to the battery is limited; and the charging efficiency of the TWS earphone is calculated by multiplying the output voltage 3.3V by the output current 40mA to calculate the output power 132mW, and multiplying the input voltage 5V by the input current 40mA to calculate the input power 200mW. The output power and the input power are divided to obtain the charging efficiency of the TWS earphone, which is only 44%. It can be seen that the original TWS earphone charging system has very low charging efficiency. According to the above analysis data, for the original TWS charging bin system, when charging the original TWS earphone, at least 200mW of power needs to be boosted and output. Practical new type content

[0003] The utility model aims at at least solving one of the technical problems existing in the prior art, and provides a charging management circuit and wireless earphone system which improve charging efficiency and charging speed.

[0004] According to the charging management circuit of the first aspect of the utility model, including: charging module and equipment module, the charging module includes charging battery B1, main control unit, boost circuit, battery charger and voltage detection circuit, the equipment module includes equipment battery B2, the input of boost circuit is connected with charging battery B1, the output of boost circuit is connected with the input of battery charger, main control unit is connected with the control end of boost circuit, the output of battery charger is for equipment battery B2 charges, voltage detection circuit is used for detecting the output voltage of battery charger, and the output voltage is fed back to main control unit, main control unit can judge the input voltage demand of battery charger according to the output voltage, and main control unit controls the target voltage that boost circuit output satisfies the input voltage demand of battery charger.

[0005] According to some embodiments of the utility model, the battery charger and the equipment battery B2 have at least two respectively, the battery charger and the equipment battery B2 one-to-one corresponding charges.

[0006] According to some embodiments of the utility model, the equipment module includes unidirectional output circuit, the input of unidirectional output circuit is connected with the output of battery charger, and the output of unidirectional output circuit is connected with equipment battery B2.

[0007] According to some embodiments of the utility model, the unidirectional output circuit includes diode D1, the anode of diode D1 is connected with the output of battery charger, and the cathode of diode D1 is connected with equipment battery B2.

[0008] According to some embodiments of the utility model, the equipment module includes battery protector, the battery charger charges equipment battery B2 through battery protector, and the battery protector is used to avoid overvoltage / overcurrent charging of equipment battery B2.

[0009] According to some embodiments of the utility model, the battery charger includes linear charger.

[0010] According to the wireless earphone system of the second aspect of the utility model, the charging management circuit is mentioned above, still includes charging bin and earphone, the charging module is arranged in the charging bin, the equipment module is arranged in the earphone, the earphone can be placed in the charging bin, when the earphone is placed into the charging bin, the charging output end of the charging bin is connected with the charging input end of the earphone.

[0011] The charging management circuit and the wireless earphone system have at least the following beneficial effects: when the battery charger charges the device battery, the voltage detection circuit is used for detecting the output voltage of the battery charger, and the output voltage is fed back to the master control unit; the master control unit can judge the input voltage demand of the battery charger according to the output voltage, and then the master control unit controls the voltage boost circuit to boost to the target voltage meeting the input voltage demand to supply the battery charger; that is, the master control unit controls the voltage boost circuit in real time according to the output voltage fed back by the voltage detection circuit in real time to output the target voltage consistent with the input voltage demand, without the need of voltage reduction and recharging in the battery charger, so that the charging efficiency is improved, and the power consumption is reduced. Compared with the prior art, the device module does not need to integrate a linear charger, the circuit is simplified, and the cost and size are obviously reduced.

[0012] The additional aspects and advantages of the present application will be given in part in the following description, some will become apparent from the following description, or will be understood by those skilled in the art through practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0013] The specific embodiments of the present application will be further described below with reference to the accompanying drawings;

[0014] Figure 1 is the principle diagram of the existing wireless earphone system;

[0015] Figure 2 is the circuit principle diagram of the wireless earphone system of the present application;

[0016] Figure 3 is the circuit principle diagram of the specific embodiment of the wireless earphone system of the present application. DETAILED DESCRIPTION

[0017] This part will describe the specific embodiments of the present application in detail, and the preferred embodiments of the present application are shown in the accompanying drawings, and the drawings are used to supplement the description of the text part, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the present application, but it cannot be understood as a limitation on the protection scope of the present application.

[0018] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc., is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0019] In the description of the utility model, if the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, exceed and the like are understood as not including the number, above, below, within and the like are understood as including the number. If it is described to the first, the second is only used for distinguishing the technical features for the purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0020] Referring to Figures 1 to 3 , the utility model provides a charging management circuit, include: charging module 10 and equipment module 20, charging module 10 includes charging battery B1, main control unit 11, boost circuit 12, battery charger and voltage detection circuit, equipment module 20 includes equipment battery B2, the input of boost circuit 12 is electrically connected with charging battery B1, the output of boost circuit 12 is electrically connected with the input of battery charger, main control unit 11 is electrically connected with the control end of boost circuit 12, the output of battery charger is for equipment battery B2 charges, voltage detection circuit is used to detect the output voltage of battery charger, and the output voltage is fed back to main control unit 11, main control unit 11 can judge the input voltage demand of battery charger according to the output voltage, and main control unit 11 controls boost circuit 12 output target voltage satisfying the input voltage demand of battery charger. That is, main control unit 11 controls boost circuit 12 in real time according to the output voltage of voltage detection circuit in real time to output the target voltage consistent with the input voltage demand, without step-down recharging in the battery charger, not only improves the efficiency of charging, but also reduces the power consumption. And compared with prior art, equipment module 20 does not need to integrate linear charger, simplifies the circuit, and significantly reduces the cost and size.

[0021] Among them, battery charger adopts prior art, supports direct battery charging, for example, the battery charger includes linear charger, supports lithium battery charging, has the most basic function: trickle charging when the voltage of equipment battery B2 is low, constant current charging when the voltage is moderate, and finally charging the battery with constant voltage charging mode. Voltage detection circuit also adopts prior art, such as voltage detection circuit based on resistance voltage division principle, the input end thereof is electrically connected with the output end of battery charger to detect the output voltage of battery charger, and the output end thereof is electrically connected with main control unit 11 to feed back the output voltage to main control unit 11. Main control unit 11 adopts existing main control chip, has the ability to calculate the input voltage demand according to the output voltage, and can also give corresponding control signal to boost circuit 12 according to different input voltage demand, so that boost circuit 12 outputs target voltage.

[0022] The boost circuit 12 is a conventional DC-DC boost circuit 12, and the minimum output voltage of the boost circuit 12 is equal to the voltage of the battery B1, so that the boost output has a wide voltage range.

[0023] In some embodiments, the device module 20 includes a unidirectional output circuit, an input end of the unidirectional output circuit is electrically connected to an output end of the battery charger, and an output end of the unidirectional output circuit is electrically connected to the device battery B2. The unidirectional output circuit specifically functions to only accept charging of the device battery B2 by the charging module 10 and does not support output of power from the device battery B2 to the outside through the unidirectional output circuit, that is, the power transmission direction is single, and when a large current is transmitted, there is a small voltage drop loss. Moreover, when charging the device battery B2, due to the low voltage drop difference characteristic of the unidirectional output circuit, the output voltage of the charging module 10 can be reduced to the same size as the voltage of the device battery B2, that is, the loss is small when charging the device battery B2. The unidirectional output circuit can be implemented in various ways, such as a diode, an ideal diode, a CMOS tube as a switch, and the like. Figure 3 As shown in the figure, the unidirectional output circuit includes a diode D1, an anode of the diode D1 is electrically connected to an output end of the battery charger, and a cathode of the diode D1 is electrically connected to the device battery B2.

[0024] In some embodiments, the device module 20 includes a battery protector, the battery charger charges the device battery B2 through the battery protector, and the battery protector is used to avoid overvoltage / overcurrent charging of the device battery B2. The battery protector can be a conventional lithium battery protector. When the device module 20 includes a unidirectional output circuit, the battery protector is located between the unidirectional output circuit and the device battery.

[0025] In some embodiments, the battery charger and the device battery B2 are at least two respectively, the battery charger and the device battery B2 are charged one by one, and the charging management circuit and the charging module 10 can be applied to various electronic devices. When the battery charger and the device battery B2 are two respectively, the charging management circuit and the charging module 10 can be applied to the wireless earphone system described below.

[0026] The utility model also provides a wireless earphone system, including above -mentioned charging management circuit and charging bin, earphone, charging module 10 is arranged in the charging bin, device module 20 is arranged in the earphone, the battery charger and device battery B2 are two respectively, and the battery charger and device battery B2 are charged one by one. The earphone can be placed in the charging bin, and when the earphone is placed into the charging bin, the charging output end of the charging bin is electrically connected to the charging input end of the earphone.

[0027] As shown in the figure, the unidirectional output circuit includes a diode D1, an anode of the diode D1 is electrically connected to an output end of the battery charger, and a cathode of the diode D1 is electrically connected to the device battery B2. Figure 3As shown, the wireless earphone system comprises a charging bin and two earphones, the charging bin comprises a charging module 10, the charging module 10 comprises a charging battery B1, a boost circuit 12, a linear charger 1, a linear charger 2, a voltage detection circuit 1, a voltage detection circuit 2 and a master control unit 11; the two earphones have similar structures, each earphone comprises an equipment module 20, the equipment module 20 comprises an equipment battery B2, a battery protector and a diode D1. When the system works, the master control unit 11 enables the boost circuit 12 to output 5V to the linear charger 1 and the linear charger 2, and the linear charger outputs VBUS to charge the earphone. The earphone charges the equipment battery B2 through the diode D1 and the battery protector. The diode D1 is a Schottky diode, which has a very small positive voltage conduction drop, such as 0.3V. Assuming that the voltage of the equipment battery B2 is 3.7V at this time, the VBUS voltage only needs to be greater than 4V to charge; still calculated by the 68mW heat dissipation capacity, the earphone charging current can be greater than 200mA at this time, and the charging current is greatly improved. At this time, the earphone efficiency is calculated to be 92.5%, and the earphone charging efficiency is also greatly improved.

[0028] The linear charger of the charging bin has a constant current output function, and all the output VBUS voltages are close to the minimum charging voltage 4V of the earphone. When the linear charger outputs stably, according to the feedback of the voltage detection circuit, the master control unit 11 controls the boost circuit 12 to output a voltage less than 5V, and the minimum voltage output by the boost circuit 12 meets the condition that the linear charger can output a 4V voltage. By reducing the output voltage of the boost circuit 12, when outputting the same current, the lower output voltage means that the output energy of the charging battery B1 is smaller, and finally the discharge efficiency is improved. The battery protector provides charging protection for the equipment battery B2 during the charging process, avoiding overvoltage and overcurrent, and when the voltage of the equipment battery reaches the limit charging voltage, the battery protector turns off the charging. At this time, the linear charger of the charging bin detects that the charging current of the earphone is reduced to below the stop charging threshold, and then stops charging the earphone. In the system, the charging current of the earphone is improved, that is, the charging speed is faster, and the charging efficiency is also improved.

[0029] Those skilled in the art can easily understand that the above preferred modes can be freely combined and superimposed without conflict.

[0030] The above is only a preferred embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation made by using the utility model specification and drawings, or direct or indirect application in other related technical fields is included in the patent protection range of the utility model.

Claims

1. A charge management circuit, characterized by, The application relates to a charging module (10) and a device module (20), the charging module (10) comprising a charging battery B1, a master control unit (11), a voltage boosting circuit (12), a battery charger and a voltage detection circuit, the device module (20) comprising a device battery B2, an input end of the voltage boosting circuit (12) being electrically connected with the charging battery B1, an output end of the voltage boosting circuit (12) being electrically connected with an input end of the battery charger, the master control unit (11) being electrically connected with a control end of the voltage boosting circuit (12), an output end of the battery charger being used for charging the device battery B2, the voltage detection circuit being used for detecting an output voltage of the battery charger and feeding back the output voltage to the master control unit (11), the master control unit (11) being capable of judging an input voltage demand of the battery charger according to the output voltage, and the master control unit (11) controlling the voltage boosting circuit (12) to output a target voltage meeting the input voltage demand of the battery charger. The battery charger and the device battery B2 are at least two respectively, and the battery charger and the device battery B2 are one-to-one corresponding charging.

2. The charge management circuit of claim 1, wherein: The device module (20) comprises a one-way output circuit, an input end of the one-way output circuit being electrically connected with an output end of the battery charger, and an output end of the one-way output circuit being electrically connected with the device battery B2.

3. The charge management circuit of claim 1, wherein: The one-way output circuit comprises a diode D1, an anode of the diode D1 being electrically connected with the output end of the battery charger, and a cathode of the diode D1 being electrically connected with the device battery B2.

4. The charge management circuit of claim 3, wherein: The device module (20) comprises a battery protector, the battery charger charges the device battery B2 through the battery protector, and the battery protector is used for avoiding overvoltage / overcurrent charging of the device battery B2.

5. The charge management circuit of claim 1, wherein: The battery charger comprises a linear charger.

6. The charge management circuit of claim 1, wherein: The lowest output voltage of the voltage boosting circuit (12) is equal to the voltage of the charging battery B1.

7. The charge management circuit of claim 1, wherein: The application further relates to a charging bin and earphones, the charging module (10) being arranged in the charging bin, the device module (20) being arranged in the earphones, and the earphones being capable of being placed in the charging bin, and a charging output end of the charging bin being electrically connected with a charging input end of the earphones when the earphones are placed in the charging bin.

8. A wireless earphone system comprising the charge management circuit according to any one of claims 1 to 7, characterized in that ​

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