WO2020192377A1

WO2020192377A1 - Earphone charging circuit, and earphone charging case

Info

Publication number: WO2020192377A1
Application number: PCT/CN2020/077835
Authority: WO
Inventors: 陶红霞
Original assignee: 上海爻火微电子有限公司
Priority date: 2019-03-27
Filing date: 2020-03-04
Publication date: 2020-10-01
Also published as: CN109768606A

Abstract

An earphone charging circuit and an earphone charging case. A first output terminal (11) and a second output terminal (12) of a direct current conversion module (1) output a first output voltage and a second output voltage to separate charging management modules (3, 4) of two earphones, respectively, such that the two earphones do not necessarily receive the same output voltage during charging. In addition, the voltage of the first output terminal (11) and the voltage of the second output terminal (12) are independently determined according to a real-time voltage of a corresponding earphone battery, thereby allowing a corresponding flexible voltage to be specifically output according to a real-time change of each earphone battery, preventing an excessive difference between a real-time voltage of an earphone battery and an output voltage for charging, and subsequently reducing waste and dissipation during linear charging of the earphones, improving energy utilization efficiency, and reducing heat generation during charging. As a result of the reduced heat generation, related application of the solution allows the earphones to support higher charging currents under the same heat generation and temperature increase conditions, thereby shortening a charging time of the earphones.

Description

Earphone charging circuit and earphone charging box

Technical field

The invention relates to the field of earphones, in particular to an earphone charging circuit and an earphone charging box.

Background technique

In the field of earphones, some earphones can be powered by the earphone cable, while other earphones need to be separately equipped with a rechargeable earphone battery. Such earphones can be wireless earphones or other earphones with specific power supply requirements. In the prior art, a specific charging circuit can be used to power the left and right earphone batteries. For example, for wireless earphones, a charging box can be configured for it, and the circuit part of the charging box is combined with the circuit part inside the earphone. , Can form a complete charging circuit.

In the charging circuit, a voltage output terminal of the DC converter is usually used to provide a common voltage V _out for charging the left and right earphone batteries. During the charging process, the charging management circuit of the two earphones can be used in this Under the power supply of the voltage V _out , the respective earphone batteries are charged by linear charging.

However, real-time two headset battery voltage may be different, for example, a first real-time voltage V of the headset battery _BAT1, _{BAT2 is} greater than a second real-time voltage V headset battery, in which case, V _OUT usually required with a larger V Matching _BAT1 will cause the difference between V _out and V _BAT2 to be relatively large. Since the headset is charged in a linear charging manner, this will cause the second headset battery’s charge management circuit to dissipate more energy. On the one hand, it will lead to a waste of electric energy, and on the other hand, it will increase the temperature of related devices due to energy dissipation, which will bring difficulties to the overall heat dissipation design of the circuit. Furthermore, in order to limit the temperature rise, the charging power of the earphones will be limited, for example, it can only be charged with a smaller charging current, which will cause the time required to complete the charging of the two earphones to be extended. It can be seen that it will also be detrimental to charging Time reduction.

Summary of the invention

The present invention provides an earphone charging circuit and an earphone charging box to solve the problems of waste of electric energy, increased temperature of devices, and disadvantages of shortening the charging time.

According to a first aspect of the present invention, a headset charging circuit is provided, including a DC conversion module, a left headset charging management module, and a right headset charging management module; the DC conversion module has at least two independent voltage output terminals;

The DC conversion module is configured to use its first output terminal to output a first output voltage to the left earphone charging management module, and use its second output terminal to output a second output voltage to the right earphone charging management module;

Wherein, the voltage value of the first output voltage is determined according to the real-time first voltage information of the left earphone battery, and the voltage value of the second output voltage is according to the real-time second voltage of the right earphone battery Information confirmed;

The left earphone charging management module is configured to output a first charging current to the left earphone battery according to the power supply of the first output voltage, so as to charge the left earphone battery in a linear charging manner;

The right earphone charging management module is configured to output a second charging current to the right earphone battery according to the power supply of the second output voltage, so as to charge the right earphone battery in a linear charging manner.

Optionally, the earphone charging circuit further includes a control module; the control module is respectively connected to the left earphone charging management module, the right earphone charging management module and the DC conversion module,

The control module is used for:

Acquiring the first voltage information through the left earphone charging management module;

Acquiring the second voltage information through the right earphone charging management module;

Determining first indication information according to the first voltage information;

Determine second indication information according to the second voltage information, and:

Sending the first indication information and the second indication information to the direct current conversion module;

The first indication information is used to indicate the voltage value of the first output voltage of the DC conversion module, and the second indication information is used to indicate the voltage value of the second output voltage of the DC conversion module;

The DC conversion module is specifically configured to adjust the first output voltage according to the first indication information, and adjust the second output voltage according to the second indication information.

Optionally, the left earphone charging management module includes a left earphone charging device, and the right earphone charging management module includes a right earphone charging device;

The left earphone charging device is connected between the first output terminal and the left earphone battery for receiving the first output voltage and outputting the first charging current to the left earphone battery;

The right earphone charging device is connected between the second output terminal and the right earphone battery, and is configured to receive the second output voltage and output the second charging current to the right earphone battery.

Optionally, the left earphone charging management module further includes a left earphone processing unit, and the right earphone charging management module further includes a right earphone processing unit; the left earphone charging device is output under the control of the left earphone processing unit For the first charging current, the right earphone charging device outputs the second charging current under the control of the right earphone processing unit.

Optionally, the left earphone charging management module further includes a left earphone processing unit, and the right earphone charging management module further includes a right earphone processing unit;

The left earphone processing unit is directly or indirectly connected to the left earphone battery and the control module, and can collect the first voltage information, and send the first voltage information to the control module;

The right earphone processing unit is directly or indirectly connected to the right earphone battery and the control module, and can collect the second voltage information, and send the second voltage information to the control module.

Optionally, the DC conversion module is further configured to control the first output terminal to stop outputting voltage after the charging of the left earphone rechargeable battery is completed, and: control the second output terminal after the charging of the right earphone rechargeable battery is completed The output terminal stops outputting voltage.

Optionally, the DC conversion module is a single-inductor dual-output buck-boost DC converter.

According to a second aspect of the present invention, there is provided an earphone charging box, including a box body, a left earphone interface assembly for connecting a left earphone provided on the box body, and a left earphone interface assembly provided on the box body for connecting The right earphone interface assembly of the right earphone, and the DC conversion module directly or indirectly arranged on the box body; the DC conversion module is connected to the left earphone interface assembly and the right earphone interface assembly respectively, and the DC conversion module has At least two independent voltage output terminals;

The DC conversion module is used for:

When the left earphone is connected to the left earphone interface assembly, the first output terminal of the DC conversion module is used to output a first output voltage to the left earphone, so that the left earphone can be at a voltage lower than the first output voltage. Under power supply, charge the left earphone battery by linear charging; and:

When the right earphone is connected to the right ear interface assembly, the second output terminal of the DC conversion module is used to output a second output voltage to the right earphone, so that the right earphone can be at the lower of the second output voltage. Under power supply, charge the right earphone battery by linear charging;

Wherein, the voltage value of the first output voltage is determined according to the real-time first voltage information of the left earphone battery, and the voltage value of the second output voltage is according to the real-time second voltage of the right earphone battery The information is certain.

Optionally, the headset charging box further includes a control module;

The control module is respectively connected to the DC conversion module, the left earphone interface assembly, and the right ear interface assembly;

The control module is configured to: determine the first indication information according to the first voltage information fed back by the connected left earphone, and determine the second indication information according to the second voltage information fed back by the connected right earphone, and: The DC conversion module sends the first indication information and the second indication information; the first indication information is used to indicate the voltage value of the first output voltage of the DC conversion module, and the second indication information is used To indicate the voltage value of the second output voltage of the DC conversion module;

The earphone charging circuit and earphone charging box provided by the present invention respectively output the first output voltage and the second output voltage to the charging management modules of two earphones through the first output terminal and the second output terminal of the DC conversion module, so that the two The headset does not need to be supplied with the same output voltage when charging. At the same time, since the first output voltage and the second output voltage are respectively determined according to the real-time voltage of the corresponding headset battery, the present invention can target the real-time changes of the headset battery. Floating the corresponding output voltage can prevent the real-time voltage of the earphone battery from being too large for the output voltage used for charging, which in turn can help reduce the loss of the earphone during linear charging, improve energy efficiency, and reduce charging Fever. Since the heat generation is reduced, under the same heat and temperature rise, the application of the solution involved in the present invention can enable the headset to support a larger charging current, thereby helping to reduce the charging time of the headset.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor.

Fig. 1 is a circuit diagram 1 of an earphone charging circuit in an embodiment of the present invention;

FIG. 2 is a second schematic circuit diagram of an earphone charging circuit in an embodiment of the present invention;

FIG. 3 is a circuit diagram three of an earphone charging circuit in an embodiment of the present invention;

Fig. 4 is a circuit diagram 1 of an earphone charging box and earphones in an embodiment of the present invention;

FIG. 5 is a second schematic diagram of a circuit of an earphone charging box and earphones in an embodiment of the present invention;

Fig. 6 is a circuit diagram 3 of an earphone charging box and earphones in an embodiment of the present invention;

Fig. 7 is a fourth circuit diagram of an earphone charging box and earphones in an embodiment of the present invention.

Description of reference signs:

1- DC conversion module;

11-The first output terminal;

12- The second output terminal;

2- control module;

3-Left headset charging management module;

31-Left earphone charging device;

32-left earphone processing unit;

4- Right earphone charging management module;

41- Right earphone charging device;

42-Right earphone processing unit;

5- Headphone charging box;

51-Left headphone interface assembly;

511-Left headphone power interface component;

512-left earphone signal interface component;

52-Right headphone interface assembly;

521-right earphone power interface component;

522-right earphone signal interface component;

6-left earphone;

7- Right earphone;

BAT0- main battery;

BAT1-Left headphone battery;

BAT2-Right headset battery.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, but not necessarily Describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations of them are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to the clearly listed Those steps or units may include other steps or units that are not clearly listed or are inherent to these processes, methods, products, or equipment.

The technical solutions of the present invention will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

Fig. 1 is a circuit diagram 1 of an earphone charging circuit in an embodiment of the present invention.

Please refer to FIG. 1, the earphone charging circuit includes a DC conversion module 1, a left earphone charging management module 3, and a right earphone charging management module 4. The first output terminal 11 of the DC conversion module 1 can be connected to the left earphone charging management module 3, and the second output terminal 12 can be connected to the right earphone charging management module 4.

The left earphone charging management module 3 can be understood to be used for outputting a first charging current to the left earphone battery BAT1 according to the power supply of the first output voltage V _out1 output by the DC conversion module 1, so as to be charged in a linear manner Charging the left earphone battery BAT1;

The right earphone charging management module 4 can be understood to be used for outputting a second charging current to the right earphone battery BAT2 according to the power supply of the second output voltage V _out2 output by the DC conversion module 1, so as to be charged in a linear manner Charge the right earphone battery.

The charging management module can be any circuit structure that can realize linear charging, as well as software and hardware configurations. Because it is a linear charging circuit structure, if only one output terminal is used, the charging management circuit of the earphone battery mentioned above needs to dissipate more energy. For details, please refer to the following relevant examples for understanding:

If V _{out is used to} characterize the output voltage of the only output terminal, V _out can be a fixed voltage output. For example, the most commonly used 5V output of a boost DC converter chip, at the same time, the maximum possible output of a boost chip configured for a 5V voltage output 5.25V, considering that the internal space of the headset is extremely limited and the required charging current is generally small, such as less than 100mA. Among them, the battery capacity of each headset is generally about 20-40mAh, even if 3C (three times the capacity value) is used for charging, The charging current may also be only 90 mA. Therefore, the charging management module inside the headset generally only supports linear charging. The exploration of this embodiment and its alternative solutions is based on the linear charging charging management module.

When V _out is 5.25V, and the battery voltage of one of the earphones is relatively low, for example, 3.25V, if the charging current is 1C, assuming the battery capacity is 30mAh, the charging current can be 30mA, then the internal The linear charging circuit needs to dissipate about (5.25V-3.25V)*30mA=60mW power. If you want to use fast 3C, that is, 90mA charging, you need to dissipate about 180mW power. On the one hand, this energy will greatly waste electrical energy, thereby reducing the number of full charging of the headset that the circuit can support. On the other hand, because it will emit a large amount of heat, it will also bring a test to the heat dissipation design of the headset. For this, the present embodiment and its alternative solutions can effectively solve this problem, and for details, please refer to the relevant description of the technical solution below.

In addition, since the left and right earphones are often not fully charged at the same time, and the boost DC converter chip has a single voltage output, when any earphone is fully charged, it is often necessary to add a load switch to turn off the use of this earphone. The power supply for charging, at this time, it is necessary to keep another earphone continuing to charge. Of course, this can be achieved by adding a load switch. However, this will also increase the system cost and occupy more circuit board area of the system. For this, this implementation Some optional solutions in the example can effectively solve this problem. For details, please refer to the relevant description of the technical solution below.

The DC conversion module 1 can be any circuit structure that has at least two independent voltage output terminals and can realize the voltage rise and fall of the DC power. The number of the voltage output terminals can be two or greater than or equal to three. Regardless of the number, as long as two satisfy the following description, they will not deviate from the scope of the above description. The two voltage output terminals can be understood as the first voltage output terminal 11 and the second voltage output terminal 12.

In this embodiment, the DC conversion module 1 is configured to use its first output terminal 11 to output a first output voltage V _out1 to the left earphone charging management module 3, and use its second output terminal 12 to output to the right earphone The charging management module 4 outputs the second output voltage V _out2 .

Since the two output terminals are relatively independent, they can be controlled to output different first output voltage and second output voltage. Therefore, the two earphones need not be supplied with the same output voltage when charging, and furthermore, they can be targeted Provide a basis for adjusting the output voltage.

In one of the embodiments, the DC conversion module 1 may be a single-inductor dual-output buck-boost DC converter, which can be specifically characterized as: Buck-BoostConverterOneInductorDualOutput; this type of DC converter already in the field, and the Any improved DC converter of this type of DC converter does not deviate from the description of the above embodiment.

In another embodiment, the DC conversion module 1 may also use two buck-boost DC converters with a single output to output the first output voltage V _out1 and the second output voltage V _{out2 respectively} , using a single DC converter. The solution can effectively reduce the use of space, help improve the integration level of the circuit, and also help reduce the cost.

Wherein, the voltage value of the first output voltage V _out1 is determined according to the real-time first voltage information of the left earphone battery, and the voltage value of the second output voltage V _out2 is determined according to the real-time voltage value of the right earphone battery. The second voltage information is determined.

It can be seen that the above embodiments can adjust the corresponding output voltage according to the real-time change of the earphone battery, which can avoid the excessive gap between the real-time voltage of the earphone battery and the output voltage used for charging, and thus can help to reduce the earphone during linear charging. Dissipation, improve energy use efficiency, and reduce heat generation during charging.

Fig. 2 is a second circuit diagram of an earphone charging circuit in an embodiment of the present invention. It can be understood as a further solution of the embodiment shown in FIG. 1.

Please refer to FIG. 2, the earphone charging circuit further includes a control module 2; the control module 2 is connected to the left earphone charging management module 3, the right earphone charging management module 4 and the DC conversion module 1 respectively.

The control module 2 is used for:

Acquiring the first voltage information through the left earphone charging management module 3;

The second voltage information is obtained through the right earphone charging management module 4.

It can be seen that the real-time voltage information of the headset battery is reported to the control module through the signal channel, which can provide a basis for the adjustment of the voltage rise and fall of the DC conversion module 1.

Control module 2 is also used for:

Send the first indication information and the second indication information to the DC conversion module 1.

The first indication information may be understood as a voltage value used to indicate the first output voltage of the DC conversion module. The voltage value of the first output voltage can refer to a single voltage value or multiple voltage values within an interval range. It can be seen that the control module 2 can determine a single value or an interval range.

The second indication information may be understood as a voltage value used to indicate the second output voltage of the direct current conversion module. The voltage value of the second output voltage can refer to a single voltage value or multiple voltage values within an interval range. It can be seen that the control module 2 can determine a single value or an interval range.

The first indication information and the second indication information can be characterized by digital signals. Therefore, a digital communication interface of the control module 2 can be connected and communicated with a digital communication interface of the DC conversion module 1 for sending the first indication information And the second instruction information.

The DC conversion module 1 may be specifically configured to adjust the first output voltage according to the first indication information, and adjust the second output voltage according to the second indication information.

It can be seen that since the first indication information is determined according to the first voltage information, and the first output voltage is adjusted according to the first indication information, it can effectively ensure that the voltage value of the first output voltage is based on the real-time first value of the left earphone battery. The voltage information is determined; because the second indication information is determined according to the second voltage information, the second output voltage is adjusted according to the second indication information, which can effectively ensure that the voltage value of the second output voltage is based on the real-time value of the right earphone battery The second voltage information is determined.

In other words, through the above processing process of the control module, it can be effectively guaranteed that the first output voltage can float with the real-time first voltage information of the left earphone battery BAT1, and that the second output voltage can float with the real-time second voltage information of the right earphone battery BAT2.

In one of the embodiments, the DC conversion module 1 is also used to control the first output terminal 11 to stop outputting voltage after the charging of the left earphone rechargeable battery BAT1 is completed, and to charge the right earphone rechargeable battery BAT2 After completion, the second output terminal 12 is controlled to stop outputting voltage.

In the specific implementation process, the DC conversion module 1 can implement the above process under the control of the control module 2. For example, the first output terminal 11 can be controlled to stop outputting the voltage when the first termination signal sent by the control module 2 is received. The control module 2 controls the second output terminal 12 to stop outputting the voltage when the second termination signal is sent.

The first termination signal may be generated by the control module 2 according to the first voltage information and preset full-charge voltage information when the first voltage information reaches the full-charge voltage information; the second termination signal may be the control module 2 According to the second voltage information and the preset full-charge voltage information, it is generated when the second voltage information reaches the full-charge voltage information.

The termination signal mentioned above may also be a digital signal, which can then be sent through the digital communication interface mentioned above.

Through the above implementation manners, the charging can be stopped after the charging is completed in time, which is beneficial to the effect of saving electric energy and protecting the device. Compared with the means of using a load switch to control the turn-off, this embodiment can reduce the system cost and save the space of the circuit board occupied by the system.

In another embodiment, the earphone charging circuit involved in this embodiment does not exclude the possibility that the function of the control module 2 can be realized by devices or circuit parts other than the charging circuit. The earphone charging circuit involved in this embodiment also It is not ruled out that the function of the control module 2 may be realized by the related chips and circuits already in the earphone.

It can be seen that as long as the voltage value of the first output voltage is determined according to the real-time first voltage information of the left earphone battery, the voltage value of the second output voltage is determined according to the real-time second voltage information of the right earphone battery, regardless of configuration And the use of the control module does not deviate from the description of this embodiment.

In one embodiment, the control module 2 may be, for example, a microcontroller, which may be characterized as a MicroController. The digital communication interface can be, for example, an I2C interface.

Please refer to FIG. 2, the left earphone charging management module 3 may include a left earphone charging device 31, and the right earphone charging management module 4 may include a right earphone charging device 41.

The left earphone charging device 31 is connected between the first output terminal 11 and the left earphone battery BAT1 for receiving the first output voltage V _BAT1 and outputting the first output voltage to the left earphone battery BAT1 A charging current.

The right earphone charging device 41 is connected between the second output terminal 12 and the right earphone battery BAT2, and is configured to receive the second output voltage V _BAT2 and output the second output voltage to the right earphone battery BAT2. 2. Charging current.

In one of the embodiments, the left earphone charging device 31 and the right earphone charging device 41 can be linear chargers, which can be specifically characterized as linear chargers. In other alternative embodiments, the left earphone charging device 31 and the right earphone charging device 41 can also be replaced by field effect transistors such as enhanced PMOS.

In one of the embodiments, the left earphone charging management module 3 further includes a left earphone processing unit 32, and the right earphone charging management module 4 further includes a right earphone processing unit 42.

In an example, the left earphone processing unit 32 may be connected to the left earphone charging device 31, and further, the left earphone charging device 31 may output the first charging current under the control of the left earphone processing unit 32. The right earphone processing unit 42 may be connected to the right earphone charging device 41, and further, the right earphone charging device 41 may output the second charging current under the control of the right earphone processing unit 42.

It can be seen that in this example, the linear charging process can be controlled by the processing unit.

In another example, the left earphone charging device 31 and the right earphone charging device 41 can also realize linear charging process control through other circuit parts, and the left earphone charging device 31 and the right earphone charging device 41 can also be linearly charged by themselves. Control without the intervention of other circuit parts.

In one example, by connecting the left earphone processing unit 32 and the left earphone charging device 31, and the right earphone processing unit 42 and the right earphone charging device 41, the collection of the first voltage information and the collection of the second voltage information can be realized . This connection manner can also be understood as the left earphone processing unit 32 is indirectly connected to the left earphone battery BAT1, and the right earphone processing unit 42 is indirectly connected to the right earphone battery BAT2.

In another example, the left earphone processing unit 32 can also be directly connected to the left earphone battery BAT1, and the right earphone processing unit 42 can also be directly connected to the right earphone battery BAT2, and further, directly collect the first voltage information and the second voltage information .

It can be seen that the left earphone processing unit 32 can directly or indirectly connect the left earphone battery BAT1 and the control module 2, and can collect the first voltage information, and send the first voltage to the control module 2. information. The right earphone processing unit 42 can directly or indirectly connect the right earphone battery BAT2 and the control module 2, and can collect the second voltage information, and send the second voltage information to the control module 2.

In one of the embodiments, the left earphone processing unit 32 and the right earphone processing unit 42 may be SOC processing chips, which may be, for example, SOC processing chips that come with the earphone.

Fig. 3 is a circuit diagram 3 of an earphone charging circuit in an embodiment of the present invention. It can be understood as a further embodiment of the embodiment shown in FIG. 1 and FIG. 2.

In the embodiment shown in FIG. 3, V _BAT1 can be used to characterize the above-mentioned first voltage information, and V _BAT2 can be used to characterize the above-mentioned second voltage information. In addition, V _BAT0 can also be used to characterize the input voltage of the main battery BAT0.

The main battery BAT0 can be connected to the input terminal of the DC conversion module 1 for supplying the input voltage V _BAT0 to the DC conversion module 1. Furthermore, the first output voltage V _out1 and the second output voltage V _out2 can be understood as the input voltage V _BAT0 is generated after buck-boost.

In the embodiment shown in FIG. 3, the inductor L illustrated in the DC conversion module 1 can be understood as representing the DC conversion module 1 as a single-inductor dual-output buck-boost DC converter, that is, as shown in FIG. The DC conversion module 1 in the solution is a single-inductor dual-output buck-boost DC converter.

In the specific implementation process applicable to Figure 1, Figure 2 and Figure 3:

The DC conversion module 1 can adopt a single-inductor dual-output buck-boost DC converter that supports two independent outputs with a single inductor. It can be understood as a chip that supports a control module such as a microcontroller through I2C The digital communication interface of the interface controls it. Under the condition that the input voltage V _BAT0 is 2.5V-4.5V, the microcontroller can request the first output voltage V _{out 1} and the second output voltage V of this buck-boost chip _{out 2} outputs any different voltage between 3.0V-5.0V as expected. Of course, the first output voltage V _{out 1} and the second output voltage V _{out 2} can also be turned off or turned on independently, because the left earphone battery BAT1 and The right earphone battery BAT2 can also be a lithium battery, so the voltage range of V _BAT0 , V _{BAT 1} and V _{BAT 2} is basically between 2.5V and 4.5V.

In combination with the above conditions, the voltage value of the first output voltage V _out1 in the various implementations of this embodiment can be floated based on real-time changes in V _BAT1 , and the voltage value of the second output voltage V _out2 can be based on real-time changes in V _BAT2 . Floating, that is, the left earphone processing unit and the right earphone processing unit of the earphone can transmit the voltage values of V _BAT1 and V _BAT2 to the control module 2 of the microcontroller in real time. At this time, the control module can instruct the DC conversion module 1 to be suitable after judgment To charge the left and right earphones.

For example: V _BAT1 = 3.6V, V _{BAT 2} = 3.8V, if V _BAT0 = 4.2V at this time, the DC conversion module 1 can step down output V _out1 = 3.8V, V _out2 = 4.0V, if V _BAT0 = 3.3V, the DC conversion module 1 can boost output V _out1 = 3.8V, V _out2 = 4.0V, then V _{out1 is} almost equal to V _BAT1 , V _{out 2 is} almost equal to V _BAT2 , so the example in the left earphone at this time The efficiency of the left earphone charging device of the linear charger can be as high as 3.6V/3.8V*100%=94.7%, and the efficiency of the right earphone charging device such as the linear charger in the right earphone can be as high as 3.8V/4.0V*100%= 95%, which can be much higher than the 3.25V/5.25V*100%=61.9% efficiency listed above when the above-mentioned scheme is not adopted.

In addition, since V _out1 and V _{out2 are} individually controllable, when any earphone is fully charged, the charging input of the earphone can be turned off in time, that is, V _out1 or V _out2 can be turned off, and the remaining one can continue to be filled with the corresponding earphone. , And then turn off charging, the system enters standby mode.

It can be seen that the above embodiments and their corresponding optional implementations provide a single-inductor, independently controllable, dual-output buck-boost DC conversion chip idea, and use this chip idea to combine the information communication capabilities of the left and right earphones and the charging box A circuit architecture is built to make the left earphone or right earphone maintain high efficiency during charging, so that heating problems will not occur when the charging current is greatly increased. Furthermore, the circuit architecture can also help realize the earphone Efficient and fast charging.

Fig. 4 is a circuit diagram 1 of an earphone charging box and earphones in an embodiment of the present invention.

Please refer to Figure 4, there is provided an earphone charging box 5, including a box body (not shown), a left earphone interface assembly 51 for connecting a left earphone provided on the box body, and a left earphone interface assembly 51 provided on the box body. The right earphone interface assembly 52 for connecting to the right earphone, and the DC conversion module 1 directly or indirectly arranged on the box body; the DC conversion module 1 is respectively connected to the left earphone interface assembly 51 and the right earphone interface Component 52, the DC conversion module 1 has at least two mutually independent voltage output terminals.

The DC conversion module 1 is used for:

When the left earphone 6 is connected to the left earphone interface assembly 51, the first output terminal 11 of the DC conversion module 1 is used to output a first output voltage to the left earphone 6, so that the left earphone 6 can be Under the power supply of the first output voltage, charge the left earphone battery BAT1 by linear charging; and:

When the right earphone 7 is connected to the right ear interface assembly 52, the second output terminal 12 of the DC conversion module 1 is used to output a second output voltage to the right earphone 7, so that the right earphone 7 can be Under the power supply of the second output voltage, charge the right earphone battery BAT2 by linear charging;

Fig. 5 is a second schematic circuit diagram of an earphone charging box and earphones in an embodiment of the present invention.

Please refer to Figure 5, the headset charging box 5 also includes a control module 2;

The control module 2 is connected to the DC conversion module 1, and the control module 2 is connected to the left ear interface component 51 and the right ear interface component 52.

The control module 2 is configured to: determine the first indication information according to the first voltage information fed back by the connected left earphone 6, and determine the second indication information according to the second voltage information fed back by the connected right earphone 7, and : Sending the first indication information and the second indication information to the DC conversion module 1; the first indication information is used to indicate the voltage value of the first output voltage of the DC conversion module 1, the The second indication information is used to indicate the voltage value of the second output voltage of the DC conversion module 1.

The DC conversion module 1 is specifically configured to adjust the first output voltage according to the first indication information, and adjust the second output voltage according to the second indication information.

6 is a third circuit diagram of an earphone charging box and earphones in an embodiment of the present invention; FIG. 7 is a fourth circuit diagram of an earphone charging box and earphones in an embodiment of the present invention.

The embodiments shown in FIGS. 4 to 7 can be correspondingly understood as an application of the circuit shown in FIGS. 1 to 3, and the implementation principles, technical effects, meanings of terms, and applicable connection relationships are similar. For the same or similar parts, we will not repeat them here.

According to Figures 4 to 7, the control module 2 and the DC conversion module 1 of the earphone charging circuit can be arranged in the earphone charging box 5, for example, can be arranged in the earphone charging box 5 through a circuit board, thereby forming an earphone capable of charging the earphone Charging box, the earphone charging box can also play the role of accommodating earphones.

Correspondingly, the left earphone charging management module 3 and the left earphone battery BAT1 of the earphone charging circuit can be arranged on the left earphone 6, and the right earphone charging management module 4 and the right earphone battery BAT2 of the earphone charging circuit can be arranged on the right earphone 7.

Since the earphone charging box 5 and the left earphone 6 and the earphone charging box 5 and the right earphone 7 are not fixedly connected, a complete earphone charging circuit can be formed after the left earphone 6 and the right earphone 7 are connected.

In order to be suitable for its access, the left earphone interface assembly 51 and the right earphone interface assembly 55 are used in the embodiments shown in FIGS. 4 to 7, which can be understood as any component or combination of components that can achieve contact and conduction, and its shape Both the conduction structure and the conduction structure can be various, and as long as the contact conduction is achieved, the scope of the above description is not deviated.

In one of the embodiments, the left earphone interface assembly 51 may include a left earphone power interface component 511 and a left earphone signal interface component 512. Between the first output terminal 11 and the left earphone charging device 31 of the left earphone charging management module 3, The left earphone power interface component 511 is used to form an electric energy path to realize the transmission of electric energy. The electric energy path can be specifically understood as: Power Path. Between the control module 2 and the left earphone processing unit 32 of the left earphone charging management module 3, the left earphone can be used The signal interface component 512 forms a signal path to realize signal transmission, and the signal path can be specifically understood as: Signal Path.

In one of the embodiments, the right earphone interface assembly 52 may include a right earphone power interface component 521 and a right earphone signal interface component 522. Between the second output terminal 12 and the right earphone charging device 41 of the right earphone charging management module 4, The right earphone power interface component 521 is used to form an electric energy path to realize the transmission of electric energy. The electric energy path can be specifically understood as: Power Path. Between the control module 2 and the right earphone processing unit 42 of the right earphone charging management module 4, the right earphone can be used The signal interface component 522 forms a signal path to implement signal transmission, and the signal path can be specifically understood as: Signal Path.

In another embodiment, the signal interface component and the power interface component may not be distinguished, for example, only one interface component is used, and further, the signal path can be multiplexed on the power path.

In summary, the earphone charging circuit and earphone charging box provided by the present invention respectively output the first output voltage and the second output voltage to the charging management modules of the two earphones through the first output terminal and the second output terminal of the DC conversion module. , The two earphones do not need to be supplied with the same output voltage when charging. At the same time, since the first output voltage and the second output voltage are respectively determined according to the real-time voltage of the corresponding earphone battery, the present invention can be targeted to the earphone battery Real-time changes, real-time floating of the corresponding output voltage, which can avoid the gap between the real-time voltage of the headset battery and the output voltage used for charging is too large, which can help reduce the dissipation of the headset during linear charging and improve the efficiency of energy use , To reduce heat during charging. Since the heat generation is reduced, under the same heat and temperature rise, the application of the solution involved in the present invention can enable the headset to support a larger charging current, thereby helping to reduce the charging time of the headset.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand: It is still possible to modify the technical solutions described in the foregoing embodiments, or equivalently replace some or all of the technical features; these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention range.

Claims

An earphone charging circuit, which is characterized by comprising a DC conversion module, a left earphone charging management module and a right earphone charging management module; the DC conversion module has at least two mutually independent voltage output terminals;

The DC conversion module is configured to use its first output terminal to output a first output voltage to the left earphone charging management module, and use its second output terminal to output a second output voltage to the right earphone charging management module;

Wherein, the voltage value of the first output voltage is determined according to the real-time first voltage information of the left earphone battery, and the voltage value of the second output voltage is according to the real-time second voltage of the right earphone battery Information confirmed;

The left earphone charging management module is configured to output a first charging current to the left earphone battery according to the power supply of the first output voltage, so as to charge the left earphone battery in a linear charging manner;

The right earphone charging management module is configured to output a second charging current to the left earphone battery according to the power supply of the second output voltage, so as to charge the right earphone battery in a linear charging manner.
The earphone charging circuit according to claim 1, further comprising a control module; the control module is respectively connected to the left earphone charging management module, the right earphone charging management module and the DC conversion module,

The control module is used for:

Acquiring the first voltage information through the left earphone charging management module;

Acquiring the second voltage information through the right earphone charging management module;

Determining first indication information according to the first voltage information;

Determine second indication information according to the second voltage information, and:

Sending the first indication information and the second indication information to the direct current conversion module;

The first indication information is used to indicate the voltage value of the first output voltage of the DC conversion module, and the second indication information is used to indicate the voltage value of the second output voltage of the DC conversion module;

The DC conversion module is specifically configured to adjust the first output voltage according to the first indication information, and adjust the second output voltage according to the second indication information.
The earphone charging circuit according to claim 2, wherein the left earphone charging management module includes a left earphone charging device, and the right earphone charging management module includes a right earphone charger device;

The left earphone charging device is connected between the first output terminal and the left earphone battery, and is configured to receive the first output voltage and output the first charging current to the left earphone battery;

The right earphone charging device is connected between the second output terminal and the right earphone battery, and is configured to receive the second output voltage and output the second charging current to the right earphone battery.
The earphone charging circuit according to claim 3, wherein the left earphone charging management module further comprises a left earphone processing unit, the right earphone charging management module further comprises a right earphone processing unit; the left earphone charging device is The first charging current is output under the control of the left earphone processing unit, and the right earphone charging device is outputting the second charging current under the control of the right earphone processing unit.
The earphone charging circuit according to claim 2 or 3, wherein the left earphone charging management module further comprises a left earphone processing unit, and the right earphone charging management module further comprises a right earphone processing unit;

The left earphone processing unit directly or indirectly connects the left earphone battery and the control module, and can collect the first voltage information, and send the first voltage information to the control module;

The right earphone processing unit is directly or indirectly connected to the right earphone battery and the control module, and can collect the second voltage information, and send the second voltage information to the control module.
The earphone charging circuit according to any one of claims 1 to 4, wherein the DC conversion module is further configured to control the first output terminal to stop outputting voltage after the charging of the left earphone rechargeable battery is completed, and : Control the second output terminal to stop outputting voltage after the charging of the right earphone rechargeable battery is completed.
The earphone charging circuit according to any one of claims 1 to 4, wherein the DC conversion module is a single-inductor dual-output buck-boost DC converter.
An earphone charging box, characterized by comprising a box body, a left earphone interface assembly for connecting a left earphone provided on the box body, and a right earphone interface for connecting a right earphone provided on the box body Components, and a DC conversion module directly or indirectly arranged on the box body; the DC conversion module is respectively connected to the left earphone interface assembly and the right earphone interface assembly, and the DC conversion module has at least two mutually independent Voltage output terminal;

The DC conversion module is used for:

When the left earphone is connected to the left earphone interface assembly, the first output terminal of the DC conversion module is used to output a first output voltage to the left earphone, so that the left earphone can be at a voltage lower than the first output voltage. Under power supply, charge the left earphone battery by linear charging; and:

When the right earphone is connected to the right ear interface assembly, the second output terminal of the DC conversion module is used to output a second output voltage to the right earphone, so that the right earphone can be at the lower of the second output voltage. Under power supply, charge the right earphone battery by linear charging;

Wherein, the voltage value of the first output voltage is determined according to the real-time first voltage information of the left earphone battery, and the voltage value of the second output voltage is according to the real-time second voltage of the right earphone battery The information is certain.
The headset charging box of claim 8, further comprising a control module;

The control module is respectively connected to the DC conversion module, the left earphone interface assembly, and the right earphone interface assembly;

The control module is configured to: determine the first indication information according to the first voltage information fed back by the connected left earphone, and determine the second indication information according to the second voltage information fed back by the connected right earphone, and: The DC conversion module sends the first indication information and the second indication information; the first indication information is used to indicate the voltage value of the first output voltage of the DC conversion module, and the second indication information is used To indicate the voltage value of the second output voltage of the DC conversion module;

The DC conversion module is specifically configured to adjust the first output voltage according to the first indication information, and adjust the second output voltage according to the second indication information.
The earphone charging box according to claim 8 or 9, wherein the DC conversion module is a single-inductor dual-output buck-boost DC converter.