CN216291379U - Charging box and circuit thereof, and wireless earphone assembly - Google Patents

Abstract

The utility model relates to a charging box, a circuit of the charging box and a wireless earphone assembly. The charging box circuit comprises a battery and a charging and power supplying unit, wherein the charging and power supplying unit comprises a controller, an inductor, a plurality of switching devices, a voltage input end, a battery end and a voltage output end; the controller controls the on and off of the plurality of switching devices to multiplex the inductors in time division when the battery is charged and when the battery outputs a voltage through the voltage output terminal; during charging, generating charging voltage based on the voltage input by the voltage input end and the inductor, and outputting the charging voltage to the battery through the battery end; when the voltage is output, the output voltage is generated based on the voltage output by the battery and the inductance and is output to the wireless earphone through the voltage output end, and the output voltage can provide charging voltage for the wireless earphone battery; and/or the output voltage can be representative of the data information. The utility model realizes the advantages of the switch type charging circuit, does not need to increase inductance, reduces cost and saves space; the output voltage may represent data information so that the charging box may communicate with the wireless headset.

Description

Charging box and circuit thereof, and wireless earphone assembly

Technical Field

The utility model relates to the technical field of earphones, in particular to a charging box and a circuit thereof, and a wireless earphone assembly.

Background

Compared with wired earphones, wireless earphones have the advantage of being convenient to carry, and are therefore increasingly popular with people. The Wireless headset may be a True Wireless Stereo (TWS) headset. In the conventional design, the charging management unit in the charging box is generally a linear charging circuit, and the defects of the conventional design are that the charging speed is slow and the heat generation is large. One way to improve this is to replace it with a switch-type charging circuit, but the switch-type charging circuit requires an additional inductor, which increases the cost and occupies a larger space.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the technical problems and provides a charging box, a circuit thereof and a wireless earphone assembly, which can realize the advantages of a switch type charging circuit during charging, namely high charging speed, small heating, no need of additionally increasing an inductor, cost reduction, space saving and contribution to realizing miniaturization; in addition, the output voltage may represent data information when needed so that the charging box may communicate with the wireless headset.

In order to achieve the above object, an aspect of the present invention provides a charging box circuit, which includes a charging box battery and a charging and supplying unit, where the charging and supplying unit includes a controller, an inductor, a plurality of switching devices, a voltage input terminal, a battery terminal, and at least one voltage output terminal, one terminal of the charging box battery is coupled to a first ground terminal, and the other terminal of the charging box battery is coupled to the battery terminal of the charging and supplying unit; the controller is used for controlling the on and off of the plurality of switching devices so as to multiplex the inductor in a time-sharing manner when the charging box battery is charged and the voltage is output by the charging box battery through the at least one voltage output end; during charging, generating a charging voltage based on the voltage input by the voltage input end and the inductor, and outputting the charging voltage to the charging box battery through the battery end to realize switch charging; when the voltage is output, the output voltage is generated based on the voltage output by the charging box battery and the inductor, and the output voltage is output to the wireless earphone through the at least one voltage output end, wherein the output voltage can provide charging voltage for the wireless earphone battery, so that the switch power supply is realized; and/or the output voltage can be representative of data information when the charging box needs to communicate with the wireless headset.

Optionally, the charging and power supplying unit further includes a highest voltage selecting unit, a first input terminal of the highest voltage selecting unit is coupled to the voltage input terminal, a second input terminal of the highest voltage selecting unit is coupled to the battery terminal, a third input terminal of the highest voltage selecting unit is coupled to the at least one voltage output terminal, an output terminal of the highest voltage selecting unit is connected to the controller, and the highest voltage selecting unit is configured to output a highest voltage among the voltage input terminal, the battery terminal, and the at least one voltage output terminal to the controller through an output terminal of the highest voltage selecting unit, so as to supply power to the controller.

Optionally, the highest voltage selection unit includes a first sub-switch, a second sub-switch, a first comparator and a first inverter, one end of the first sub-switch is coupled to the voltage input terminal, the other end of the first sub-switch is coupled to a first output terminal, one end of the second sub-switch is coupled to the battery terminal, the other end of the second sub-switch is coupled to the first output terminal, a first input terminal of the first comparator is coupled to the voltage input terminal, a second input terminal of the first comparator is coupled to the battery terminal, and an output terminal of the first comparator is coupled to a control terminal of the second sub-switch and is coupled to the control terminal of the first sub-switch through the first inverter; the highest voltage selection unit further comprises a third sub-switch, a fourth sub-switch, a second comparator and a second inverter, wherein one end of the third sub-switch is coupled to the first output end, the other end of the third sub-switch is coupled to a second output end, the second output end is coupled to the output end of the highest voltage selection unit, one end of the fourth sub-switch is coupled to the voltage output end, the other end of the fourth sub-switch is coupled to the second output end, a first input end of the second comparator is coupled to the first output end, a second input end of the second comparator is coupled to the voltage output end, and an output end of the second comparator is coupled to a control end of the fourth sub-switch and is coupled to a control end of the third sub-switch through the second inverter; and/or the charging box circuit further comprises a control unit, the control unit acquires the voltage required by charging the wireless earphone through the at least one voltage output end, feeds back a target voltage to the charging and power supplying unit according to the voltage required by charging, the target voltage is a function taking the voltage required by charging as a variable, and the charging and power supplying unit adjusts the output voltage to the target voltage and outputs the target voltage to the wireless earphone through the at least one voltage output end.

Optionally, the data information is binary data represented by 1 and 0, wherein: the output voltage comprises a high level voltage and a low level voltage, the high level voltage represents a logic 1, and the low level voltage represents a logic 0; or the output voltage represents logic 1 for a first duration, and the output voltage represents logic 0 for a second duration; or, the output voltage comprises a high-level voltage and a low-level voltage, the period of alternation of the high-level voltage and the low-level voltage is greater than the set time length and represents one of logic 1 and 0, and the period of alternation of the high-level voltage and the low-level voltage is less than the set time length and represents the other of logic 1 and 0.

Optionally, the controller is configured to control the plurality of switching devices to be turned on and off such that: during step-down charging, the first connection end of the inductor is alternately coupled to the voltage input end and the first grounding end, and the second connection end of the inductor is continuously coupled to the battery end; or, during boost charging, the first connection end of the inductor is continuously coupled to the voltage input end, and the second connection end of the inductor is alternately coupled to the battery end and the first ground end; or, when the voltage is reduced and the power is supplied, the first connection end of the inductor is continuously coupled to the voltage output end, and the second connection end of the inductor is alternately coupled to the battery end and the first ground end; or, when boosting power supply, the first connection end of the inductor is alternately coupled to the voltage output end and the first ground end, and the second connection end of the inductor is continuously coupled to the battery end; when the buck-boost power supply is performed, the first connection end of the inductor is coupled to the first grounding end, the second connection end of the inductor is coupled to the battery end, the first connection end of the inductor is coupled to the voltage output end, and the second connection end of the inductor is coupled to the first grounding end alternately.

Optionally, the first connection terminal of the inductor is coupled to a first node N1, the second connection terminal of the inductor is coupled to a second node N2, and the plurality of switching devices include: a first switch coupled between the voltage input and the first node N1; a second switch coupled between the first node N1 and the first ground; a third switch coupled between the voltage output terminal and the first node N1; a fifth switch coupled between the battery terminal and the second node N2; a sixth switch coupled between the first ground and the second node N2.

Optionally, during buck charging, the first switch and the second switch are controlled to be alternately turned on, the fifth switch is continuously turned on, and the sixth switch and the third switch are continuously turned off; or, during boost charging, the fifth switch and the sixth switch are controlled to be alternately turned on, the first switch is continuously turned on, and the second switch and the third switch are continuously turned off; or, during the step-down power supply, the fifth switch and the sixth switch are controlled to be alternately turned on, the third switch is continuously turned on, and the second switch and the first switch are continuously turned off; or, during the boost power supply, the third switch and the second switch are controlled to be alternately turned on, the fifth switch is continuously turned on, and the sixth switch and the first switch are continuously turned off; and when the power supply is subjected to buck-boost power supply, the conduction of the second switch and the fifth switch and the conduction of the third switch and the sixth switch are alternately carried out.

Optionally, the controller is further configured to determine whether the charging and power supplying unit can operate in a charging state according to a magnitude relationship between the voltage input by the voltage input terminal and a set value; when the charging and power supplying unit can work in a charging state, the controller is further used for determining that the charging and power supplying unit carries out step-down charging or step-up charging according to the magnitude relation between the voltage input by the voltage input end and the voltage of the battery of the charging box; and/or the controller is further used for determining whether the charging and power supplying unit can work in an output voltage state according to the magnitude relation between the voltage output by the charging box battery and the effective output voltage of the charging box battery; when the charging and power supplying unit can work in an output voltage state and needs to supply power, the controller is further used for determining that the charging and power supplying unit supplies power in a voltage reduction mode or a voltage boosting mode according to the size relation between the voltage output by the charging box battery and the required working voltage output by the voltage output end.

Optionally, the charging and supplying unit has at least one of a buck charging mode, a boost charging mode, a buck supplying mode, a boost supplying mode, a buck charging-buck supplying mode, a boost charging-boost supplying mode, a buck charging-boost supplying mode and a boost charging-buck supplying mode; when the voltage input by the voltage input end is greater than the set value, the controller determines that the charging and power supplying unit can work in a charging state, wherein: when the voltage input by the voltage input end is smaller than the voltage of the battery of the charging box, the controller controls the on and off of the plurality of switching devices to enable the charging and power supplying unit to work in the boosting charging mode, and the charging and power supplying unit forms a boosting type switching charging circuit; when the voltage input by the voltage input end is greater than the voltage of the battery of the charging box, the controller controls the on and off of the plurality of switching devices to enable the charging and power supplying unit to work in the voltage reduction charging mode, and the charging and power supplying unit forms a voltage reduction type switch charging circuit; when the voltage output by the charging box battery is greater than the effective output voltage of the charging box battery, the controller determines that the charging and power supply unit can work in an output voltage state, wherein: when the voltage output by the charging box battery is smaller than the required working voltage output by the voltage output end, the controller controls the plurality of switching devices to be switched on and switched off, so that the charging and power supply unit works in the boosting power supply mode, and the charging and power supply unit forms a boosting type switch power supply circuit; when the voltage output by the charging box battery is greater than the required working voltage output by the voltage output end, the controller controls the on and off of the plurality of switching devices to enable the charging and power supplying unit to work in the voltage reduction power supply mode, and the charging and power supplying unit forms a voltage reduction type switch power supply circuit; when the charging and power supplying unit is capable of operating in the charging state and the output voltage state, the charging and power supplying unit comprises at least one of the following conditions: when the voltage input by the voltage input end is smaller than the voltage of the charging box battery and the voltage output by the charging box battery is smaller than the required working voltage output by the voltage output end, the controller controls the plurality of switching devices to be switched on and off, so that the charging and power supply unit works in the boost charging-boost power supply mode, and the charging and power supply unit alternately forms the boost switch charging circuit and the boost switch power supply circuit; when the voltage input by the voltage input end is less than the voltage of the charging box battery and the voltage output by the charging box battery is greater than the required working voltage output by the voltage output end, the controller controls the on and off of the plurality of switching devices to enable the charging and power supplying unit to work in the boost charging-buck power supplying mode, and the charging and power supplying unit alternately forms the boost switch charging circuit and the buck switch power supplying circuit; when the voltage input by the voltage input end is greater than the voltage of the charging box battery and the voltage output by the charging box battery is less than the required working voltage output by the voltage output end, the controller controls the on and off of the plurality of switching devices to enable the charging and power supplying unit to work in the buck charging-boost power supplying mode, and the charging and power supplying unit alternately forms the buck switching charging circuit and the boost switching power supplying circuit; when the voltage input by the voltage input end is greater than the voltage of the charging box battery and the voltage output by the charging box battery is greater than the required working voltage output by the voltage output end, the controller controls the on and off of the plurality of switching devices to enable the charging and power supplying unit to work in the voltage reduction charging-voltage reduction power supplying mode, and the charging and power supplying unit alternately forms the voltage reduction type switch charging circuit and the voltage reduction type switch power supplying circuit.

Optionally, the controller is further configured to sample a charging current and control on and off duty ratios of the plurality of switching devices according to the sampled charging current, so as to implement constant current charging control; the controller is also used for sampling the charging voltage and controlling the on-off duty ratio of the plurality of switching devices according to the charging voltage obtained by sampling so as to realize constant voltage charging control; the controller is also used for sampling the power supply voltage and controlling the power supply voltage by controlling the on-off duty ratio of the plurality of switching devices according to the power supply voltage obtained by sampling; and/or the at least one voltage output terminal comprises a first voltage output terminal and a second voltage output terminal; when power is supplied, the controller controls the charging and power supplying unit to generate a power supply voltage based on the voltage output by the charging box battery and the inductor, and the power supply voltage is alternately output through the first voltage output end and the second voltage output end; a first output capacitor is arranged between the first voltage output end and the ground in series; and a second output capacitor is arranged between the second voltage output end and the ground in series.

A second aspect of the present invention provides a charging box comprising the charging box circuit of the first aspect described above.

A third aspect of the present invention provides a wireless headset assembly comprising: a wireless headset having a voltage connection terminal and a second ground terminal, and including a headset battery and a communication unit; the charging box provided by the second aspect, when charging, the first ground terminal of the charging box is coupled to the second ground terminal, and the voltage output terminal of the charging box is coupled to the voltage connection terminal, so that the voltage connection terminal can receive the output voltage output by the voltage output terminal, wherein: the output voltage is capable of charging the headset battery and/or the communication unit is capable of obtaining data information from the output voltage.

In the scheme, the charging management circuit in the charging box circuit is replaced by the switch-type charging circuit from the linear charging circuit, and the switch-type charging circuit and the voltage regulating circuit are integrated into the charging and power supply unit, so that the switch-type charging management circuit and the voltage regulating circuit share the inductor, and the advantages of the switch-type charging circuit in charging the battery of the charging box can be realized, namely, the charging speed is high, the heating is small, the inductor is not required to be additionally added, the cost is reduced, the space is saved, and the miniaturization is favorably realized; in addition, the output voltage may represent data information when needed so that the charging box may communicate with the wireless headset.

Additional features and advantages of the utility model will be set forth in the detailed description which follows.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a charging circuit of a wireless headset assembly;

fig. 2 is a schematic structural diagram of a charging box circuit according to an embodiment of the present disclosure;

fig. 3 is a schematic circuit structure diagram of the charging and power supplying unit in fig. 2;

FIG. 4 is a diagram of an exemplary circuit configuration of the highest voltage selection unit of FIG. 3;

FIG. 5 is an exemplary circuit configuration diagram of the controller of FIG. 3;

fig. 6 is an exemplary waveform diagram of the current in the inductor when the charging and power supplying unit is in the step-down charging state;

FIG. 7 is an exemplary waveform of current in an inductor when the charging and power supply unit is in an output voltage state;

FIG. 8 is an exemplary waveform of current in the inductor when the charging and power supply unit is in the dual mode;

fig. 9 is a schematic structural diagram of a charging circuit of a wireless headset assembly according to an embodiment of the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1 is a schematic structural diagram of a charging circuit of a wireless headset assembly. Wherein, the wireless earphone component can comprise a charging box and a wireless earphone. As shown in fig. 1, the charging circuit consists of two parts, namely a first part located in the charging box (as shown in the left dashed box in fig. 1) and a second part located in the wireless headset (as shown in the right dashed box in fig. 1). The first partial circuit may include a charge box battery BAT2, a linear charging circuit, and a voltage boosting circuit. The second part of the circuit may include a headset battery BAT1 and a charge management circuit, and may also include a set-up circuit, an analog-to-digital converter ACD and a radio frequency circuit RF 1. The linear charging circuit in the charging box realizes the function of charging the battery BAT2 of the charging box, the function of the booster circuit is to provide the voltage output by the battery BAT2 of the charging box to the wireless earphone after being boosted to 5V, namely, the voltage of VCHG is 5V voltage, and the charging management circuit in the wireless earphone charges the battery VBAT1 of the earphone through the 5V voltage. The setting circuit can set the charging voltage of the charging management circuit, the analog-to-digital converter ACD can measure the voltage of the earphone battery BAT1, and the radio frequency circuit RF1 can communicate with terminal equipment such as a mobile phone.

In the above scheme, the linear charging circuit in the charging box has the problems of low charging speed and large heat generation during charging. One way to improve this is to replace it with a switch-type charging circuit, but the switch-type charging circuit requires an additional inductor, which increases the cost and occupies a larger space.

In view of this, the embodiment of the application provides a charging box, a circuit thereof, and a wireless headset assembly, which can realize the advantages of a switch-type charging circuit during charging, that is, fast charging speed, less heat generation, no need of additionally increasing an inductor, reduced cost, saved space, and benefit for realizing miniaturization; further, when needed, the output voltage of the charging box circuit output to the wireless headset can represent data information, so that the charging box can communicate with the wireless headset. In addition, it should be noted that the charging box circuit can also be applied to other charging devices, such as a charger.

Fig. 2 is a schematic structural diagram of a charging box circuit according to an embodiment of the present application. As shown in fig. 2, the charge box circuit includes a charge box battery BAT2 and a charge supply unit 21. The charging and power supplying unit 21 may include a voltage input terminal VIN, a battery terminal, and at least one voltage output terminal such as VO1 and/or VO 2. One end of the battery BAT2 is coupled to the first ground terminal, and the other end is coupled to the battery terminal of the charging and power supplying unit 21.

In addition, the charging box circuit can further comprise a control unit MCU, and when power is supplied, the control unit MCU can adjust the output voltage output by the charging and power supplying unit 21 according to the voltage of at least one voltage output end such as VO1 and/or VO2, so that the difference between the output voltage of the power supplying unit 21 and the voltage required by charging of the wireless headset is small, loss is reduced, and charging efficiency is improved.

Fig. 3 is a schematic circuit structure diagram of the charging and power supplying unit in fig. 2. As shown in fig. 3, the charging and power supplying unit 21 may further include a controller 211, an inductor L1, and a plurality of switching devices such as S1-S6, wherein the inductor L1 is used for carrying energy. The controller 211 is configured to control on and off of the plurality of switching devices to time-division multiplex the inductor L1 when the charge cassette battery BAT2 is charged and when a voltage is output from the charge cassette battery BAT2 through at least one voltage output terminal.

During charging, a charging voltage is generated based on the voltage input by the voltage input terminal VIN and the inductor L1, and the charging voltage is output to the battery BAT2 of the charging box through the battery terminal, so that the switch charging is realized.

When outputting the voltage, an output voltage is generated based on the voltage output from the battery BAT2 of the charge box and the inductor L1, and the output voltage is output to the wireless headset through at least one voltage output terminal. The output voltage can provide charging voltage for the wireless earphone battery, and the switch power supply is realized, namely, the power supply state is realized at the moment. And when the charging box needs to communicate with the wireless earphone, the output voltage can represent data information, and a communication function is realized.

That is, the output voltage output by the charging box circuit through the voltage output end can be only used for supplying power to the wireless earphone, and only the switch power supply is realized; or the output voltage output by the charging box circuit through the voltage output end can be only used for representing data information to realize the communication between the charging box and the wireless earphone, and at the moment, the charging box circuit can not be used for charging the wireless earphone and only realizes the communication function; or the output voltage output by the charging box circuit through the voltage output end is used for supplying power to the wireless earphone, and meanwhile, the output voltage can also be used for representing data information, so that the communication between the charging box and the wireless earphone is realized, namely, the communication function is realized while the switch is used for supplying power.

The data information may include information such as the electric quantity of the battery of the charging box, the on-off state of the lid of the charging box, and the like. In one example, the data information may be binary data represented by 1 and 0, and the output voltage may include a high level voltage representing a logic 1 and a low level voltage representing a logic 0. Alternatively, the duration of the output voltage for the first time period may represent a logic 1, and the duration of the output voltage for the second time period may represent a logic 0. Alternatively, the output voltage may include a high level voltage and a low level voltage, the period of alternation of the high level voltage and the low level voltage is greater than the set time period representing one of logic 1 and 0, and the period of alternation of the high level voltage and the low level voltage is less than the set time period representing the other of logic 1 and 0.

In the above scheme, the charging management circuit in the charging box circuit is replaced by the switch-type charging circuit from the linear charging circuit, and the switch-type charging circuit and the voltage regulation circuit are integrated into the charging and power supply unit 21, so that the switch-type charging management circuit and the voltage regulation circuit share the inductor L1, and thus, the advantages of the switch-type charging circuit in charging the battery BAT2 of the charging box can be realized, namely, the charging speed is high, the heating is small, the inductor L1 is not required to be additionally added, the cost is reduced, the space is saved, and the miniaturization is favorably realized.

In addition, the output voltage may represent data information when needed so that the charging box may communicate with the wireless headset. Also, the communication function may be performed simultaneously with the switch power supply, or may be performed separately. The following mainly describes the function of the charging and power supplying unit 21 to perform switch charging and/or switch power supplying.

Specifically, the controller 211 may be configured to determine whether the charging and power supplying unit 21 can operate in the charging state according to a magnitude relationship between the voltage input by the voltage input terminal VIN and a set value. When the charging and supplying unit 21 can work in the charging state, the controller 211 is further configured to determine that the charging and supplying unit 21 performs the step-down charging or the step-up charging according to a magnitude relationship between the voltage input by the voltage input terminal VIN and the voltage of the battery BAT2 of the charging box.

Further, the controller 211 may be further configured to sample the charging current and control on and off duty ratios of the plurality of switching devices according to the sampled charging current, so as to implement constant current charging control. The controller 211 is further configured to sample the charging voltage and control the on and off duty ratios of the plurality of switching devices according to the sampled charging voltage, thereby implementing constant voltage charging control. For example, the controller 211 may sample the voltage across the switch S5 in fig. 3 and obtain the charging current by combining the resistance of the switch S5, i.e., the voltage on the side of the switch S5 connected to the battery terminal. That is, only the battery BAT2 of the charge box is charged, and when the wireless headset is not supplied with power through the voltage output terminal, there is no output voltage at the voltage output terminal, e.g., VO1 and/or VO 2. When the constant voltage charging control is performed on the battery BAT2 of the charging box, the feedback voltage can be obtained from the battery BAT2 of the charging box, and the constant voltage control is realized through a negative feedback loop. For example, the negative feedback loop compares the voltage VBAT2 of the battery BAT2 with a set value, such as 4.2V, and decreases the duty cycle of the switch if the voltage of the battery BAT2 is higher than 4.2V; if the voltage VBAT2 of the charge box battery BAT2 is lower than 4.2V, the duty cycle of the switch is increased until the two are equal to maintain balance.

In addition, the controller 211 may be configured to determine whether the charging and power supplying unit 21 can operate in the output voltage state according to a magnitude relationship between the voltage output from the charge box battery BAT2 and the effective output voltage of the charge box battery BAT 2. When the charging and supplying unit 21 can work in the output voltage state and needs to supply power, the controller 211 is further configured to determine that the charging and supplying unit 21 performs step-down power supply or step-up power supply according to a magnitude relationship between the output voltage output by the charging box battery BAT2 and the required working voltage output by the voltage output terminal. Further, the controller 211 is further configured to sample an output voltage at, for example, the voltage output terminal VO1 or VO2, and control the output voltage by controlling on and off duty ratios of the plurality of switching devices according to the sampled output voltage.

Where the charging and power supplying unit 21 includes a voltage output terminal, such as VO1, the controller 211 may be configured to control the on and off of a plurality of switching devices, such that: during step-down charging, the first connection terminal of the inductor L1 is alternately coupled to the voltage input terminal VIN and the first ground terminal, and the second connection terminal of the inductor L1 is continuously coupled to the battery terminal; during boost charging, the first connection terminal of the inductor L1 is continuously coupled to the voltage input terminal VIN, and the second connection terminal of the inductor L1 is alternately coupled to the battery terminal and the first ground terminal; when the voltage is reduced and the power is supplied, the first connection end of the inductor L1 is continuously coupled to the voltage output end, and the second connection end of the inductor L1 is alternately coupled to the battery end and the first grounding end; during boosting power supply, the first connection end of the inductor L1 is alternately coupled to the voltage output end and the first ground end, and the second connection end of the inductor L1 is continuously coupled to the battery end; when the buck-boost power supply is performed, the first connection end of the inductor is coupled to the first grounding end, the second connection end of the inductor is coupled to the battery end, the first connection end of the inductor is coupled to the voltage output end, and the second connection end of the inductor is coupled to the first grounding end alternately.

In fig. 3, a first connection terminal of an inductor L1 is coupled to a first node N1, a second connection terminal of an inductor L1 is coupled to a second node N2, and a plurality of switching devices includes a first switch S1, a second switch S2, a third switch S3, a fifth switch S5, and a sixth switch S6. The first switch S1 is coupled between the voltage input terminal VIN and a first node N1, the second switch S2 is coupled between the first node N1 and a first ground terminal, the third switch S3 is coupled between the voltage output terminal and a first node N1, the fifth switch S5 is coupled between the battery terminal and a second node N2, and the sixth switch S6 is coupled between the first ground terminal and a second node N2.

Thus, during the buck charging, the first switch S1 and the second switch S2 are controlled to be alternately turned on, the fifth switch S5 is continuously turned on, and the sixth switch S6 and the third switch S3 are continuously turned off. During boost charging, the fifth switch S5 and the sixth switch S6 are controlled to alternately conduct, the first switch S1 is continuously conducted, and the second switch S2 and the third switch S3 are continuously disconnected. During the step-down power supply, the fifth switch S5 and the sixth switch S6 are controlled to be alternately turned on, the third switch S3 is continuously turned on, and the second switch S2 and the first switch S1 are continuously turned off. During the boost power supply, the third switch S3 and the second switch S2 are controlled to be alternately turned on, the fifth switch S5 is continuously turned on, and the sixth switch S6 and the first switch S1 are continuously turned off. In the buck-boost power supply, the second switch S2 and the fifth switch S5 are turned on alternately with the third switch S3 and the sixth switch S6 being turned off.

It should be noted that, when the charging and power supplying unit 21 includes a voltage output terminal, such as VO2, the third switch S3 may be replaced by the fourth switch S4. In one example, the at least one voltage output terminal may include a first voltage output terminal VO1 and a second voltage output terminal VO 2. When supplying power, the controller 211 controls the charging and supplying unit 21 to generate a supply voltage based on the voltage output from the battery BAT2 of the charging box and the inductor L1, and to alternately output the supply voltage through the first voltage output terminal VO1 and the second voltage output terminal VO 2. A first output capacitor C1 is arranged between the first voltage output end VO1 and the ground in series; a second output capacitor C2 is connected in series between the second voltage output terminal VO2 and ground. The first output capacitor C1 can stabilize the output voltage of the first voltage output terminal VO1, and the second output capacitor C2 can stabilize the output voltage of the second voltage output terminal VO 2. The charging and power supplying unit 21 can realize that VIN is used as input to charge the battery BAT2 of the charging box, and also can realize that the battery BAT2 of the charging box generates output voltage as input, and the output voltage is output through the first voltage output end VO1 and the second voltage output end, and is matched with the first output capacitor C1 and the second capacitor C2, so that the output voltage can be generated when the battery BAT2 is charged.

That is, the charging and supplying unit 21 may have at least one of a step-down charging mode, a step-up charging mode, a step-down supplying mode, a step-up supplying mode, a step-down charging-step-down supplying mode, a step-up charging-step-up supplying mode, a step-down charging-step-up supplying mode, and a step-up charging-step-down supplying mode.

When the voltage input at the voltage input terminal VIN is greater than the set value, the controller 211 determines that the charging and supplying unit 21 can operate in the charging state, where: when the voltage input by the voltage input terminal VIN is less than the voltage of the battery BAT2 of the charging box, the controller 211 controls the on and off of the plurality of switching devices to make the charging and power supplying unit 21 work in the boost charging mode, and the charging and power supplying unit 21 forms a boost switching charging circuit; when the voltage input from the voltage input terminal VIN is greater than the voltage of the battery BAT2 of the charging box, the controller 211 controls the on and off of the plurality of switching devices, so that the charging and power supplying unit 21 operates in the step-down charging mode, and the charging and power supplying unit 21 forms a step-down switching charging circuit.

When the output voltage output from the charge box battery BAT2 is greater than the effective output voltage of the charge box battery BAT2, the controller 211 determines that the charge and power supply unit 21 can operate in an output voltage state in which: when the voltage output by the battery BAT2 of the charge box is less than the required working voltage output by the voltage output terminal, the controller 211 controls the on and off of the plurality of switching devices to make the charge and power supply unit 21 work in the boost power supply mode, and the charge and power supply unit 21 forms a boost type switch power supply circuit; when the voltage output by the battery BAT2 of the charging box is greater than the required working voltage output by the voltage output terminal, the controller 211 controls the on and off of the plurality of switching devices to make the charging and power supplying unit 21 work in the step-down power supply mode, and the charging and power supplying unit 21 forms a step-down switch power supply circuit.

When the charging and supplying unit 21 is capable of operating in the charging state and the output voltage state, the charging and supplying unit 21 includes at least one of the following cases:

1) when the voltage input by the voltage input terminal VIN is less than the voltage of the battery BAT2 of the charging box and the voltage output by the battery BAT2 of the charging box is less than the required working voltage output by the voltage output terminal, the controller 211 controls the on and off of the plurality of switching devices, so that the charging and power-supplying unit 21 works in the boost charging-boost power supply mode, and the charging and power-supplying unit 21 alternately forms a boost switching charging circuit and a boost switching power supply circuit.

2) When the voltage input by the voltage input terminal VIN is smaller than the voltage of the battery BAT2 of the charging box and the voltage output by the battery BAT2 of the charging box is larger than the required working voltage output by the voltage output terminal, the controller 211 controls the on and off of the plurality of switching devices, so that the charging and power supplying unit 21 works in a boost charging-buck power supplying mode, and the charging and power supplying unit 21 alternately forms a boost switching charging circuit and a buck switching power supplying circuit.

3) When the voltage input by the voltage input terminal VIN is greater than the voltage of the battery BAT2 of the charging box and the voltage output by the battery BAT2 of the charging box is less than the required working voltage output by the voltage output terminal, the controller 211 controls the on and off of the plurality of switching devices, so that the charging and power supplying unit 21 works in the step-down charging-step-up power supplying mode, and the charging and power supplying unit 21 alternately forms a step-down switching charging circuit and a step-up switching power supplying circuit.

4) When the voltage input by the voltage input terminal VIN is greater than the voltage of the battery BAT2 of the charging box and the voltage output by the battery BAT2 of the charging box is greater than the required working voltage output by the voltage output terminal, the controller 211 controls the on and off of the plurality of switching devices, so that the charging and power supplying unit 21 works in the step-down charging-step-down power supplying mode, and the charging and power supplying unit 21 alternately forms a step-down switch charging circuit and a step-down switch power supplying circuit.

It should be noted that the charging and power supplying unit 21 may also have other operation modes, for example, when power is supplied, a buck-boost power supplying mode may also be adopted according to needs.

In addition, as shown in FIG. 3, in order to supply power to the controller 211, while ensuring that the plurality of switching devices such as S1-S6 can be completely turned off (when it is required), to prevent the leakage, the charging and power supplying unit 21 further includes a maximum voltage selecting unit VMax, a first input terminal of the maximum voltage selecting unit VMax is coupled to the voltage input terminal VIN, a second input terminal of the maximum voltage selecting unit VMax is coupled to the battery terminal, a third input terminal of the maximum voltage selecting unit VMax is coupled to at least one voltage output terminal, such as VO1 and/or VO2, an output terminal of the maximum voltage selecting unit VMax is connected to the controller 211, and the maximum voltage selecting unit VMax is configured to output a maximum voltage among the voltage input terminal VIN, the battery terminal, and the at least one voltage output terminal to the controller 211 through the output terminal of the maximum voltage selecting unit VMax to supply power to the controller 211.

Fig. 4 is a circuit configuration diagram of an exemplary maximum voltage selection unit of fig. 3. As shown in fig. 4, when the power charging and supplying unit 21 only includes the first voltage output terminal VO1, the highest voltage selecting unit VMax includes a first sub-switch S10, a second sub-switch S20, a first comparator Com10 and a first inverter INV1, one end of the first sub-switch S10 is coupled to the voltage input terminal VIN, the other end is coupled to the first output terminal (output voltage Vm), one end of the second sub-switch S20 is coupled to the battery terminal (voltage VBAT2), the other end is coupled to the first output terminal VIN, a first input terminal of the first comparator Com10 is coupled to the voltage input terminal, a second input terminal of the first comparator Com10 is coupled to the battery terminal, an output terminal of the first comparator Com10 is coupled to the control terminal of the second sub-switch S20, and is coupled to the control terminal of the first sub-switch S10 through the first inverter INV 1. The maximum voltage selecting unit VMax further includes a third sub-switch S30, a fourth sub-switch S40, a second comparator Com20 and a second inverter INV2, one end of the third sub-switch S30 is coupled to the first output terminal, the other end is coupled to the second output terminal, the second output terminal is coupled to the output terminal (output voltage is VX) of the maximum voltage selecting unit VMax, one end of the fourth sub-switch S40 is coupled to the first voltage output terminal VO1, the other end is coupled to the second output terminal, a first input terminal of the second comparator Com20 is coupled to the first output terminal, a second input terminal of the second comparator Com20 is coupled to the first voltage output terminal VO1, an output terminal of the second comparator Com20 is coupled to a control terminal of the fourth sub-switch S40, and is coupled to a control terminal of the third sub-switch S30 through the second inverter INV 2.

That is, when the power charging and supplying unit 21 includes only the first voltage output terminal VO1, the highest voltage selecting unit VMax may include switches S10-S40, inverters INV1 and INV2, a comparator Com10, and a comparator Com 20. The comparator Com10 compares the VIN voltage with the VBAT2 voltage, when the VIN voltage is greater than the VBAT2 voltage, the output of the comparator Com10 is low level, the switch S20 is off, the output is high level after inversion of the inverter INV1, the switch S10 is controlled to be on, and at the moment, the Vm voltage is equal to the VIN voltage; when VIN is lower than VBAT2, the output of the comparator INV1 is high, the control switch S20 is on, the output is low after inversion by the inverter INV1, the control switch S10 is off, and Vm is equal to VBAT2, so Vm is the higher voltage of VIN and VBAT 2.

Then, the comparator Com20 compares the Vm voltage with the voltage of the first voltage output end VO1, when the Vm voltage is greater than the voltage of the first voltage output end VO1, the comparator Com20 outputs low level, the switch S40 is turned off, the output is high level after being inverted by the inverter INV2, the switch S30 is controlled to be turned on, and the VX voltage is equal to the Vm voltage at the moment; when the Vm voltage is lower than the voltage of the first voltage output terminal VO1, the output of the comparator Com20 is high, the control switch S40 is turned on, the output is low after inversion through the inverter INV2, and the control switch S30 is turned off, at this time, the VX voltage is equal to the voltage of the first voltage output terminal VO1, so VX is the higher voltage of Vm and VO 1.

When the power charging and supplying unit 21 further includes the second voltage output terminal VO2, the highest voltage selecting unit VMax may further include a switch S50, a switch S60, an inverter INV3, and a comparator Com 30. Where Vn is the highest one of the first voltage output terminals VO1, VIN, VBAT2, and Vn is the voltage output by the second output terminal.

The comparator Com30 compares the Vn voltage with the voltage of the second voltage output end VO2, when the Vn voltage is greater than the voltage of the second voltage output end VO2, the output of the comparator Com30 is low level, the switch S60 is off, the output is high level after inversion by the inverter INV3, the switch S50 is controlled to be on, and the VX voltage is equal to the Vn voltage at this time; when the Vn voltage is lower than the voltage of the second voltage output terminal VO2, the output of the comparator Com30 is high, the control switch S60 is turned on, the output is low after inversion by the inverter INV3, and the control switch S50 is turned off, at this time, the VX voltage is equal to the voltage of the second voltage output terminal VO2, so VX is the higher voltage of Vn and VO 2.

Fig. 5 is a circuit configuration diagram of an exemplary controller of fig. 3. As shown in fig. 5, the controller 211 includes comparators Com1, Com2 and a mode control module ModeC. The mode control module ModeC may output control signals such as one or more of GS1, GS2, GS3, GS4, GS5, GS6 to enable output of the switch charge and/or output voltage. The GS1 can be used to control the on/off of the switch S1, the GS2 can be used to control the on/off of the switch S2, the GS3 can be used to control the on/off of the switch S3, the GS4 can be used to control the on/off of the switch S4, the GS5 can be used to control the on/off of the switch S5, and the GS6 can be used to control the on/off of the switch S6.

When the VIN is connected to the adapter, the BAT2 may be charged. Specifically, it can be determined by detecting whether the voltage at VIN is greater than a set value VR1, such as 4.5V. For example, the comparison between the VIN voltage and 4.5V is performed by using the comparator Com1, and if the VIN voltage is greater than 4.5V, it indicates that the adapter is inserted.

When the VBAT2 voltage is greater than the effective output voltage VR2 of the battery, such as 3.2V, for example, the comparator Com2 is used to compare the VBAT2 voltage with 3.2V, so as to determine that the battery VBAT2 is fully charged, and output voltage to the wireless headset through the first voltage output terminal VO1 and/or the second voltage output terminal VO 2.

When VIN is greater than VR1 and VBAT2 is less than VR2, C1 may be high and C2 may be low, the mode control module ModeC operates in the buck charging mode; when VIN is less than VR1 and VBAT2 is greater than VR2, C1 may be low and C2 may be high, the mode control module ModeC operates in the output voltage mode; when VIN is greater than VR1 and VBAT2 is greater than VR2, C1 may be high and C2 may be high, the mode control module ModeC may operate in buck charge and output voltage mode; when VIN is less than VR1 and VBAT2 is less than VR2, C1 may be low, C2 may be low, the mode control module ModeC may stop operating, and the outputs GS1, GS2, and GS3 are all low, controlling all switches in fig. 3 to be open.

The waveform of the current in the inductor will be described by taking the charging and power supplying unit 21 including the first voltage output terminal VO1 and the second voltage output terminal VO2 as an example. The inductor current is defined to be positive when flowing from the first node N1 to the second node N2. VR1 is 4.5V and VR2 is 3.2V.

First case

As shown in fig. 5, if the VIN voltage is greater than 4.5V and VBAT2 is less than 3.2V, the mode control module ModeC only controls to operate in the step-down charging mode to charge the battery BAT2 with VIN as input, because the VIN voltage is higher than BAT2, the step-down charging mode is performed. At this time, the mode control module ModeC controls the switches S1 and S2 to be alternately turned on (control S3 is always open), so as to implement the step-down charging control, and collect the voltage VBAT2 and the current at the battery of the charging box, thereby implementing the charging control of constant voltage or constant current.

Fig. 6 is an exemplary waveform diagram of the current in the inductor when the charging and power supplying unit is in the step-down charging state. As shown in fig. 6, the dashed line represents a zero current reference line, with the inductor current always being greater than or equal to zero.

As can be seen from fig. 3:

in a period T1, the controller 211 controls the switches S1 and S5 to be turned on (other switches are all open), the current flows from VIN to VBAT2 after flowing through S1, L1 and S5, the current of the inductor L1 rises at a slope of (VIN-VBAT2)/L (energy is stored in the inductor during this period), where VIN is a voltage value of a VIN node, VBAT2 is a voltage value of a VBAT2 node (i.e., a voltage value of the battery BAT2), and L is an inductance value of the inductor L1;

in the period T2, the controller 211 controls the switches S2 and S5 to be turned on (when the other switches are turned off), the current flows to VBAT2 from the ground through S2, L1 and S5, and the current of the inductor L1 decreases with a slope (-VBAT2)/L (energy is released to the inductor during this period), where VBAT2 is the voltage value of the node of VBAT2 (i.e., the voltage value of the battery BAT2), and L is the inductance value of the inductor L1.

Second case

If the VIN voltage is less than 4.5V and the VBAT2 voltage is greater than 3.2V, the controller 211 only controls the output voltage. The wireless headset is powered by VO1 and VO2 nodes by taking VBAT2 as input, a charging management circuit built in the headset charges a battery in the headset by taking VO1 and VO2 as power supplies, at the moment, the controller 211 controls switches S5 and S6 to be alternately switched on, the switch S3 and the switch S4 are alternately switched on, the switch S1 is always switched off, the power supply control of output voltage is realized, the output voltage is collected according to feedback of the VO1 and the VO2, the VO1 is controlled to output constant voltage by a negative feedback loop, and specific value of the output constant voltage can be set by the control unit MCU. The control unit MCU acquires the voltage required by charging of the wireless earphone through at least one voltage output end, feeds a target voltage back to the charging and power supply unit according to the voltage required by charging, the target voltage is a function taking the voltage required by charging as a variable, and the charging and power supply unit adjusts the output voltage to the target voltage and outputs the target voltage to the wireless earphone through at least one voltage output end.

In an example, the control unit MCU obtains voltage information of a battery in the first earphone through communication between the first voltage output terminal VO1 and the first earphone, obtains voltage information of a battery in the second earphone through communication between the second voltage output terminal VO2 and the second earphone, adds a certain margin voltage to the voltage of the battery in the first earphone to obtain a first target voltage, and then sets VO1 to output the first target voltage. The control unit MCU adds a certain margin voltage to the second earphone battery voltage to obtain a second target voltage, and then sets VO2 to output the second target voltage.

Fig. 7 is an exemplary waveform diagram of the current in the inductor when the charging and power supplying unit is in the output voltage state. As shown in fig. 7, the dashed line represents a zero current reference line, with the inductor current always being less than or equal to zero. As can be seen from fig. 3:

in a period T1, the controller 211 controls the switches S5 and S3 to be turned on (when other switches are open), the current flows from VBAT2 to VO1 after flowing through S5, L1, and S3, and the current of the inductor L1 decreases at a slope of (VO1-VBAT2)/L (during this period, the absolute value of the inductor current increases and the inductor stored energy increases), where VBAT2 is a voltage value of a node of VBAT2 (i.e., a voltage value of the battery BAT2), and L is an inductance value of the inductor L1;

in a period T2, the controller 211 controls the switches S6 and S3 to be turned on (when other switches are open), the current flows from the ground node to VO1 after flowing through S6, L1 and S3, and the current in the inductor L1 rises with the slope of VO1/L (during this period, energy is released to the inductor, the absolute value of the inductor current decreases, and therefore the stored energy of the inductor decreases), where VO1 is the voltage value of the node VO1, and L is the inductance value of the inductor L1;

in a period T3, the controller 211 controls the switches S5 and S4 to be turned on (when the other switches are turned off), the current flows from VBAT2 to VO2 after flowing through S5, L1, and S4, the current of the inductor L1 decreases at the slope of (VO2-VBAT2)/L (the absolute value of the inductor current increases during this period of time, and therefore the inductor energy is increased), where VBAT2 is the voltage value of the VBAT2 node (i.e., the voltage value of the battery BAT2), and L is the inductance value of the inductor L1;

during a period T4, the controller 211 controls the switches S6 and S4 to be turned on (when other switches are open), the current flows from the ground node to VO2 after flowing through S6, L1 and S4, and the current of the inductor L1 rises with the slope of VO2/L (during this period, energy is released to the inductor, the absolute value of the inductor current decreases, and therefore the stored energy of the inductor decreases), where VO2 is the voltage value of the node VO2, and L is the inductance value of the inductor L1.

Thus, the step-down power supply mode can be realized during the period T1-the period T4. In addition, at the time of the buck-boost power supply mode, the T1 period and the T3 period among the T1 period-T4 period may be modified to: in the period T1, the controller 211 controls the switches S5 and S2 to be turned on (when the other switches are open), the current flows from VBAT2 to ground after flowing through S5, L1 and S2, and the current in the inductor L1 decreases at the slope of VBAT2/L (during this period, the absolute value of the inductor current increases for the inductor energy storage, so the inductor energy storage increases); during the period T3, the controller 211 controls the switches S5 and S2 to be turned on (when the other switches are open), the current flows from VBAT2 to ground after flowing through S5, L1 and S2, and the current in the inductor L1 decreases at the slope of VBAT2/L (during this period, the absolute value of the inductor current increases for the inductor energy storage, so the inductor energy storage increases).

It should be noted that, in fig. 7, the inductor current valley value in the time period T1-T2 may not be equal to the inductor current valley value in the time period T3-T4, and may be determined according to practical design.

Third case

If the VIN voltage is greater than 4.5V and the VBAT2 voltage is greater than 3.2V, the controller 211 controls to operate in dual mode: meanwhile, a voltage reduction type charging control mode and an output voltage mode are realized, wherein the voltage reduction type charging control mode is realized by taking VIN as input to charge a battery BAT 2; the converter of the output voltage is implemented with VBAT2 as an input to supply power to the first wireless headset and the second wireless headset through the VO1 and VO2 nodes.

Fig. 8 is an exemplary waveform diagram of the current in the inductor when the charging and power supply unit is in the dual mode. Wherein "dual mode" refers to a buck charging mode and a buck-boost supply mode. As shown in fig. 8, the inductor current may have a positive value or a negative value. The dot-dash line is a 0 current reference line, and the portion above this line is a positive value and the portion below this line is a negative value. As can be seen from fig. 3:

in a period T1, the controller 211 controls the switches S1 and S5 to be turned on (when other switches are open), the current flows from VIN to VBAT2 after flowing through S1, L1 and S5, the current of the inductor L1 rises at a slope of (VIN-VBAT2)/L (energy is stored in the inductor during this period), where VIN is a voltage value of a VIN node, VBAT2 is a voltage value of a VBAT2 node (i.e., a voltage value of the battery BAT2), and L is an inductance value of the inductor L1;

in a period T2, the controller 211 controls the switches S2 and S5 to be turned on (when the other switches are turned off), the current flows to VBAT2 from the ground through S2, L1 and S5, and the current of the inductor L1 decreases with a slope (-VBAT2)/L (energy is released to the inductor during this period), where VBAT2 is the voltage value of the node of VBAT2 (i.e., the voltage value of the battery BAT2), and L is the inductance value of the inductor L1;

in the period T3, the controller 211 continues to control the switches S5 and S2 to be turned on (at this time, the other switches are all open), the current flows from VBAT2 to ground after flowing through S5, L1 and S2, the current of the inductor L1 decreases at the slope of VBAT2/L (the absolute value of the inductor current increases during this period of time, and therefore the inductor energy is increased), where VBAT2 is the voltage value of the node VBAT2 (i.e., the voltage value of the battery BAT2), and L is the inductance value of the inductor L1;

in a period T4, the controller 211 controls the switches S6 and S3 to be turned on (when other switches are open), the current flows from VBAT2 through S6, L1 and S3 to VO1, the current of the inductor L1 rises at the slope of (VO1-VBAT2)/L (during this period, energy is released to the inductor, the absolute value of the inductor current decreases, and therefore the stored energy of the inductor decreases), where VO1 is the voltage value of the node VO1, VBAT2 is the voltage value of the node VBAT2 (i.e., the voltage value of the battery BAT2), and L is the inductance value of the inductor L1;

in the period T5, the controller 211 continues to control the switches S5 and S2 to be turned on (at this time, the other switches are all open), the current flows from VBAT2 to ground after flowing through S5, L1 and S2, the current of the inductor L1 decreases at the slope of VBAT2/L (the absolute value of the inductor current increases during this period of time, and therefore the inductor energy is increased), where VBAT2 is the voltage value of the node VBAT2 (i.e., the voltage value of the battery BAT2), and L is the inductance value of the inductor L1;

in the period T6, the controller 211 controls the switches S6 and S4 to be turned on (when other switches are open), the current flows from VBAT2 to VO2 after flowing through S6, L1 and S4, the current of the inductor L1 rises at the slope of (VO2-VBAT2)/L (during this period, the energy is released to the inductor, the absolute value of the inductor current decreases, and therefore the stored energy of the inductor decreases), where VO2 is the voltage value of the node VO1, VBAT2 is the voltage value of the node VBAT2 (i.e., the voltage value of the battery BAT2), and L is the inductance value of the inductor L1.

In addition, the utility model also provides a charging box which comprises the charging box circuit.

Fig. 9 is a schematic structural diagram of a charging circuit of a wireless headset assembly according to an embodiment of the present disclosure. Wherein, wireless earphone subassembly includes at least one wireless earphone and above-mentioned box that charges. As shown in fig. 9, the wireless headset assembly may comprise two wireless headsets, namely a first wireless headset and a second wireless headset, the first wireless headset having a voltage connection VCHG1 and a second ground and comprising a headset battery, such as a BATA, and a first communication unit (not shown). The second wireless headset has a voltage connection terminal VCHG2 and a second ground terminal, and includes a headset battery BATB and a second communication unit (not shown in the figure), when charging, the first ground terminal of the charging box is coupled to the second ground terminal, the voltage output terminal of the charging box is coupled to the voltage connection terminal, such as VO1 is coupled to VCHG1, and VO2 is coupled to VCHG2, so that the voltage connection terminal can receive an output voltage output by the voltage output terminal, wherein the output voltage can charge the headset battery and/or the communication unit can obtain data information according to the output voltage.

In addition, other functional units can be arranged on the wireless earphone according to needs. In fig. 9, the first wireless headset further includes a charge management unit ChargerA, a setting unit SetA, an analog-to-digital converter ADCA, and a radio frequency unit RFA. The second wireless headset further comprises a charging management unit, namely, a ChargerB, a setting unit SetB, an analog-to-digital converter (ADCB) and a radio frequency unit (RFB).

Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (11)

1. A charging box circuit is characterized by comprising a charging box battery and a charging and power supplying unit, wherein the charging and power supplying unit comprises a controller, an inductor, a plurality of switching devices, a voltage input end, a battery end and at least one voltage output end;

the controller is used for controlling the on and off of the plurality of switching devices so as to multiplex the inductor in a time-sharing manner when the charging box battery is charged and the voltage is output by the charging box battery through the at least one voltage output end;

during charging, generating a charging voltage based on the voltage input by the voltage input end and the inductor, and outputting the charging voltage to the charging box battery through the battery end to realize switch charging; when the voltage is output, the output voltage is generated based on the voltage output by the charging box battery and the inductor and is output to the wireless earphone through the at least one voltage output end, wherein the output voltage can provide charging voltage for the wireless earphone battery to realize switch power supply; and/or the output voltage can be representative of data information when the charging box needs to communicate with the wireless headset.

2. The charging box circuit of claim 1, wherein the charging and supplying unit further comprises a highest voltage selection unit, a first input terminal of the highest voltage selection unit is coupled to the voltage input terminal, a second input terminal of the highest voltage selection unit is coupled to the battery terminal, a third input terminal of the highest voltage selection unit is coupled to the at least one voltage output terminal, an output terminal of the highest voltage selection unit is connected to the controller, and the highest voltage selection unit is configured to output a highest voltage among the voltage input terminal, the battery terminal, and the at least one voltage output terminal to the controller through the output terminal of the highest voltage selection unit to supply power to the controller.

3. The charging box circuit according to claim 2, wherein the highest voltage selection unit comprises a first sub-switch, a second sub-switch, a first comparator and a first inverter, wherein one end of the first sub-switch is coupled to the voltage input terminal, the other end of the first sub-switch is coupled to a first output terminal, one end of the second sub-switch is coupled to the battery terminal, the other end of the second sub-switch is coupled to the first output terminal, a first input terminal of the first comparator is coupled to the voltage input terminal, a second input terminal of the first comparator is coupled to the battery terminal, an output terminal of the first comparator is coupled to a control terminal of the second sub-switch, and is coupled to the control terminal of the first sub-switch through the first inverter;

the highest voltage selection unit further comprises a third sub-switch, a fourth sub-switch, a second comparator and a second inverter, wherein one end of the third sub-switch is coupled to the first output end, the other end of the third sub-switch is coupled to a second output end, the second output end is coupled to the output end of the highest voltage selection unit, one end of the fourth sub-switch is coupled to the voltage output end, the other end of the fourth sub-switch is coupled to the second output end, a first input end of the second comparator is coupled to the first output end, a second input end of the second comparator is coupled to the voltage output end, and an output end of the second comparator is coupled to a control end of the fourth sub-switch and is coupled to a control end of the third sub-switch through the second inverter; and/or the presence of a gas in the gas,

the charging box circuit further comprises a control unit, the control unit acquires the voltage required by charging of the wireless earphone through the at least one voltage output end, feeds back a target voltage to the charging and power supplying unit according to the voltage required by charging, the target voltage is a function with the voltage required by charging as a variable, and the charging and power supplying unit adjusts the output voltage to the target voltage and outputs the target voltage to the wireless earphone through the at least one voltage output end.

4. The charge box circuit of claim 1, wherein the controller is configured to control the plurality of switching devices to be turned on and off such that:

during step-down charging, the first connection end of the inductor is alternately coupled to the voltage input end and the first grounding end, and the second connection end of the inductor is continuously coupled to the battery end; alternatively, the first and second electrodes may be,

during boost charging, the first connection end of the inductor is continuously coupled to the voltage input end, and the second connection end of the inductor is alternately coupled to the battery end and the first grounding end; alternatively, the first and second electrodes may be,

when the voltage is reduced and the power is supplied, the first connecting end of the inductor is continuously coupled to the voltage output end, and the second connecting end of the inductor is alternately coupled to the battery end and the first grounding end; alternatively, the first and second electrodes may be,

when the voltage is boosted for power supply, the first connecting end of the inductor is alternately coupled to the voltage output end and the first grounding end, and the second connecting end of the inductor is continuously coupled to the battery end;

when the buck-boost power supply is performed, the first connection end of the inductor is coupled to the first grounding end, the second connection end of the inductor is coupled to the battery end, the first connection end of the inductor is coupled to the voltage output end, and the second connection end of the inductor is coupled to the first grounding end alternately.

5. The charge box circuit of claim 1,

the first connection terminal of the inductor is coupled to a first node N1, the second connection terminal of the inductor is coupled to a second node N2,

the plurality of switching devices includes:

a first switch coupled between the voltage input and the first node N1;

a second switch coupled between the first node N1 and the first ground;

a third switch coupled between the voltage output terminal and the first node N1;

a fifth switch coupled between the battery terminal and the second node N2;

a sixth switch coupled between the first ground and the second node N2.

6. The charge box circuit of claim 5, wherein:

during buck charging, the first switch and the second switch are controlled to be alternately turned on, the fifth switch is continuously turned on, and the sixth switch and the third switch are continuously turned off; or, during boost charging, the fifth switch and the sixth switch are controlled to be alternately turned on, the first switch is continuously turned on, and the second switch and the third switch are continuously turned off; alternatively, the first and second electrodes may be,

during the step-down power supply, the fifth switch and the sixth switch are controlled to be alternately conducted, the third switch is continuously conducted, and the second switch and the first switch are continuously disconnected; or, during the boost power supply, the third switch and the second switch are controlled to be alternately turned on, the fifth switch is continuously turned on, and the sixth switch and the first switch are continuously turned off; and when the power supply is subjected to buck-boost power supply, the conduction of the second switch and the fifth switch and the conduction of the third switch and the sixth switch are alternately carried out.

7. The charge box circuit of claim 1, wherein:

the controller is further used for determining whether the charging and power supplying unit can work in a charging state according to the magnitude relation between the voltage input by the voltage input end and a set value; when the charging and power supplying unit can work in a charging state, the controller is further used for determining that the charging and power supplying unit carries out step-down charging or step-up charging according to the magnitude relation between the voltage input by the voltage input end and the voltage of the battery of the charging box; and/or the presence of a gas in the gas,

the controller is also used for determining whether the charging and power supplying unit can work in an output voltage state according to the magnitude relation between the voltage output by the charging box battery and the effective output voltage of the charging box battery; when the charging and power supplying unit can work in an output voltage state and needs to supply power, the controller is further used for determining that the charging and power supplying unit supplies power in a voltage reduction mode or a voltage boosting mode according to the size relation between the voltage output by the charging box battery and the required working voltage output by the voltage output end.

8. The charging box circuit of claim 7, wherein the charging and supplying unit has at least one of a buck charging mode, a boost charging mode, a buck supplying mode, a boost supplying mode, a buck charging-buck supplying mode, a boost charging-boost supplying mode, a buck charging-boost supplying mode, and a boost charging-buck supplying mode;

when the voltage input by the voltage input end is greater than the set value, the controller determines that the charging and power supplying unit can work in a charging state, wherein: when the voltage input by the voltage input end is smaller than the voltage of the battery of the charging box, the controller controls the on and off of the plurality of switching devices to enable the charging and power supplying unit to work in the boosting charging mode, and the charging and power supplying unit forms a boosting type switching charging circuit; when the voltage input by the voltage input end is greater than the voltage of the battery of the charging box, the controller controls the on and off of the plurality of switching devices to enable the charging and power supplying unit to work in the voltage reduction charging mode, and the charging and power supplying unit forms a voltage reduction type switch charging circuit;

when the voltage output by the charging box battery is greater than the effective output voltage of the charging box battery, the controller determines that the charging and power supply unit can work in an output voltage state, wherein: when the voltage output by the charging box battery is smaller than the required working voltage output by the voltage output end, the controller controls the plurality of switching devices to be switched on and switched off, so that the charging and power supply unit works in the boosting power supply mode, and the charging and power supply unit forms a boosting type switch power supply circuit; when the voltage output by the charging box battery is greater than the required working voltage output by the voltage output end, the controller controls the on and off of the plurality of switching devices to enable the charging and power supplying unit to work in the voltage reduction power supply mode, and the charging and power supplying unit forms a voltage reduction type switch power supply circuit;

when the charging and power supplying unit is capable of operating in the charging state and the output voltage state, the charging and power supplying unit comprises at least one of the following conditions:

when the voltage input by the voltage input end is smaller than the voltage of the charging box battery and the voltage output by the charging box battery is smaller than the required working voltage output by the voltage output end, the controller controls the plurality of switching devices to be switched on and off, so that the charging and power supply unit works in the boost charging-boost power supply mode, and the charging and power supply unit alternately forms the boost switch charging circuit and the boost switch power supply circuit;

when the voltage input by the voltage input end is less than the voltage of the charging box battery and the voltage output by the charging box battery is greater than the required working voltage output by the voltage output end, the controller controls the on and off of the plurality of switching devices to enable the charging and power supplying unit to work in the boost charging-buck power supplying mode, and the charging and power supplying unit alternately forms the boost switch charging circuit and the buck switch power supplying circuit;

when the voltage input by the voltage input end is greater than the voltage of the charging box battery and the voltage output by the charging box battery is less than the required working voltage output by the voltage output end, the controller controls the on and off of the plurality of switching devices to enable the charging and power supplying unit to work in the buck charging-boost power supplying mode, and the charging and power supplying unit alternately forms the buck switching charging circuit and the boost switching power supplying circuit;

when the voltage input by the voltage input end is greater than the voltage of the charging box battery and the voltage output by the charging box battery is greater than the required working voltage output by the voltage output end, the controller controls the on and off of the plurality of switching devices to enable the charging and power supplying unit to work in the voltage reduction charging-voltage reduction power supplying mode, and the charging and power supplying unit alternately forms the voltage reduction type switch charging circuit and the voltage reduction type switch power supplying circuit.

9. The charging box circuit according to any one of claims 1 to 8, wherein the controller is further configured to sample a charging current and control the on and off duty ratios of the plurality of switching devices according to the sampled charging current, thereby implementing constant current charging control; the controller is also used for sampling the charging voltage and controlling the on-off duty ratio of the plurality of switching devices according to the charging voltage obtained by sampling so as to realize constant voltage charging control; the controller is also used for sampling the power supply voltage and controlling the power supply voltage by controlling the on-off duty ratio of the plurality of switching devices according to the power supply voltage obtained by sampling; and/or the presence of a gas in the gas,

the at least one voltage output terminal comprises a first voltage output terminal and a second voltage output terminal; when power is supplied, the controller controls the charging and power supplying unit to generate a power supply voltage based on the voltage output by the charging box battery and the inductor, and the power supply voltage is alternately output through the first voltage output end and the second voltage output end; a first output capacitor is arranged between the first voltage output end and the ground in series; and a second output capacitor is arranged between the second voltage output end and the ground in series.

10. A charging box characterized by comprising a charging box circuit according to any one of claims 1-9.

11. A wireless headset assembly, comprising:

a wireless headset having a voltage connection terminal and a second ground terminal, and including a headset battery and a communication unit;

the charging box according to claim 10, wherein the first ground terminal of the charging box is coupled to the second ground terminal and the voltage output terminal of the charging box is coupled to the voltage connection terminal so that the voltage connection terminal can receive the output voltage output from the voltage output terminal when charging, wherein: the output voltage is capable of charging the headset battery and/or the communication unit is capable of obtaining data information from the output voltage.

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