CN110492554B

CN110492554B - Adjustment control circuit, bluetooth headset, charging box and charging system

Info

Publication number: CN110492554B
Application number: CN201910661842.4A
Authority: CN
Inventors: 王远国; 雅各布·雷瑞尼尔斯
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-07-22
Filing date: 2019-07-22
Publication date: 2023-10-20
Anticipated expiration: 2039-07-22
Also published as: WO2021013042A1; CN110492554A

Abstract

The application provides an adjustment control circuit, which comprises a voltage input end and a voltage output end, wherein when the adjustment control circuit receives a first output voltage from the voltage input end, the first output voltage is compared with a reference voltage, and if the reference voltage is smaller than the first output voltage, the first output voltage is reduced and is output from the voltage output end; and if the reference voltage is larger than the first output voltage, raising the first output voltage and outputting the first output voltage from the voltage output end. The application further provides a Bluetooth headset, a charging box and a charging system comprising the adjustment control circuit.

Description

Adjustment control circuit, bluetooth headset, charging box and charging system

Technical Field

The embodiment of the application relates to the technical field of charging, in particular to the technical field of charging of Bluetooth headphones.

Background

With the popularization of consumer electronic products, wireless bluetooth headsets are favored by many consumers, but various problems encountered in the use process of bluetooth headsets are not solved well at present.

Disclosure of Invention

In order to solve the technical problems, the application provides an adjusting control circuit, a Bluetooth headset, a charging box and a charging system, so as to improve the charging efficiency.

In an embodiment of the present application, an adjustment control circuit is provided, including a voltage input terminal and a voltage output terminal, when the adjustment control circuit receives a first output voltage from the voltage input terminal, comparing the first output voltage with a reference voltage, and if the reference voltage is smaller than the first output voltage, reducing the first output voltage and outputting from the voltage output terminal; and if the reference voltage is larger than the first output voltage, raising the first output voltage and outputting the first output voltage from the voltage output end.

Therefore, the adjusting control circuit can control only one voltage boosting circuit to perform voltage boosting processing or only one voltage reducing circuit to perform voltage reducing processing at the same time according to the magnitude of the driving voltage and the first output voltage, so that the voltage boosting processing or the voltage reducing processing is performed only once on a charging path of a second rechargeable battery in the Bluetooth headset, the voltage regulating processing of boosting and reducing is not required to be performed for a plurality of times, the power consumption is effectively reduced, and meanwhile, the charging efficiency is improved.

In an embodiment of the application, the adjustment control circuit includes a voltage boosting circuit, a voltage reducing circuit and a logic control circuit. The voltage output end is used for being electrically connected with an energy storage component to be charged, and the reference voltage is a driving voltage of the energy storage component; the voltage boosting circuit is electrically connected between the voltage input end and the voltage output end, and is used for boosting the first output voltage received from the voltage input end and outputting the first output voltage from the voltage output end. The voltage reducing circuit is electrically connected between the voltage input end and the voltage output end, and is used for reducing the first output voltage received from the voltage input end and outputting from the voltage output end. The logic control circuit is electrically connected with the voltage input end, the voltage output end, the voltage boosting circuit and the voltage reducing circuit, and is used for comparing the voltage of the first output end of the voltage input end with the reference, and outputting a control signal according to the obtained comparison result to select the voltage boosting circuit to boost the first output voltage or reduce the first output voltage.

The second rechargeable battery can be charged by adjusting the voltage boosting circuit or the voltage reducing circuit in the control circuit to perform voltage boosting or voltage reducing processing for the first output voltage only once, so that the first output voltage output by the first rechargeable battery is matched with the second rechargeable battery.

In an embodiment of the present application, the control signal includes a first control signal and a second control signal. When the reference voltage is smaller than the first output voltage, the first control signal is output to the voltage reduction circuit to control the voltage reduction circuit to perform voltage boosting processing. When the reference voltage is larger than the first output voltage, the second control signal is output to the voltage boosting circuit to control the voltage boosting circuit to perform voltage boosting processing.

In an embodiment of the present application, the control signal includes a first control signal and a second control signal. When the reference voltage is smaller than the first output voltage, the logic control circuit outputs the first control signal to the voltage boosting circuit and the voltage reducing circuit, and the first control signal controls the voltage boosting circuit to stop working and controls the voltage reducing circuit to perform voltage boosting processing; when the reference voltage is larger than the first output voltage, the logic control circuit outputs the second control signal to the voltage boosting circuit and the voltage reducing circuit, and the second control signal controls the voltage reducing circuit to stop working and controls the voltage boosting circuit to perform voltage boosting processing.

The working states of the step-up circuit and the step-down circuit are respectively controlled through different control signals, so that only one of the step-up circuit and the step-down circuit performs processing on the first output voltage at the same time and charges the second rechargeable battery, the processed first output voltage is more matched with the second rechargeable battery, and the charging efficiency is effectively improved and the charging safety of the second rechargeable battery is guaranteed.

In an embodiment of the present application, the control signal further includes a third control signal, where when the voltage input end is suspended, the first output voltage is not received or the voltage output end is suspended, the third control signal controls the step-up circuit and the step-down circuit to stop working.

The voltage input end is unsettled or the unsettled characterization bluetooth headset of voltage output end does not carry out the charging with charging box electric connection, then control boost circuit and buck circuit through the third control signal and stop working to can prevent boost circuit and buck circuit still be in operating condition and consume the electric energy, reduce the consumption of adjustment control circuit.

In an embodiment of the application, the adjustment control circuit further includes a path management circuit, where the path management circuit includes a control end, a first connection end and a second connection end, the control end is electrically connected to the logic control circuit, the first connection end is electrically connected to the voltage output end, and the second connection end is electrically connected to the energy storage component. When the driving voltage output by the energy storage element is smaller than a threshold voltage, the path management circuit controls the first connecting end to be electrically connected to the second connecting end in a one-way mode, the step-up circuit or the step-down circuit outputs the first output voltage after being increased or reduced from the voltage output end, and the step-up circuit or the step-down circuit provides preset charging current to the second connecting end through the management path circuit; when the driving voltage output by the energy storage element is greater than the threshold voltage, the path management circuit controls the second connection end to be electrically conducted with the first connection end, and the step-up circuit or the step-down circuit outputs the first output voltage after being increased or reduced from the second connection end to the voltage output end through the path management circuit.

When the driving voltage output by the second rechargeable battery is smaller than the threshold voltage, the working circuit cannot be driven to work normally, and in this stage, the booster circuit can drive the working circuit to work quickly and timely to play audio signals, and the second rechargeable battery is not required to be charged to the threshold voltage in advance and then provided for the working circuit, so that the starting time of the working circuit in the Bluetooth headset is effectively saved.

In an embodiment of the present application, the path management circuit includes a transistor, a gate of the transistor is electrically connected to the control terminal, a source of the transistor is electrically connected to the second connection terminal, a drain of the transistor is electrically connected to the first connection terminal, and when the driving voltage is less than a threshold voltage, the logic control circuit outputs a first switching voltage to the gate to control the transistor to be in incomplete conduction, and the first switching voltage controls the transistor to transmit a preset charging current from the drain to the source to the second connection terminal.

When the charging voltage is greater than the threshold voltage, the first switch voltage controls the transistor to be completely conducted, the second connection end is electrically conducted with the first connection end, and the first output voltage after rising or falling is transmitted to the second connection end through the transistor.

Because the transistor is a voltage control current type element and can realize the control of the conduction degree and the drain current of the transistor through the grid source voltage when the transistor is in a constant current region, the charging current provided to the second rechargeable battery can be accurately controlled by providing different first switching voltages to the grid electrode of the transistor, and the charging safety of the second rechargeable battery in a low-voltage and low-current state is ensured. Meanwhile, the first switch voltage control transistor is in a non-complete conduction state, so that the source electrode and the drain electrode of the transistor are not electrically and completely conducted, and the second rechargeable battery is electrically disconnected from the driving voltage output end without providing driving voltage for the working circuit, thereby effectively ensuring that the working circuit works normally and is not influenced by the second rechargeable battery.

In an embodiment of the present application, the path management circuit further includes a detection circuit, where the detection circuit is electrically connected between the second connection end and the source electrode of the transistor, and is configured to detect the driving voltage and the charging current, and the logic control circuit adjusts the magnitude of the first switching voltage in real time according to the charging current obtained by detection, where the first switching voltage is used to control the conduction degree of the transistor and the magnitude of the charging current. The detection circuit can accurately detect the charging current provided to the second rechargeable battery, and then the corresponding first switching voltage can be accurately provided to control the conduction degree of the transistor according to the charging current detected by the detection circuit.

In an embodiment of the present application, a bluetooth headset is provided, including the foregoing adjustment control circuit, a second rechargeable battery and a working circuit, where the second rechargeable battery and the working circuit are electrically connected to the voltage output end, the second rechargeable battery is used as the energy storage component to output the driving voltage to power the working circuit, the first output voltage after rising or falling charges the second rechargeable battery, and the working circuit is used to output an audio signal. When the Bluetooth headset is charged, the adjustment control circuit receives the first output voltage from the charging box.

Because the adjustment control circuit is located in the Bluetooth headset, and the charging box can only be provided with the first rechargeable battery for providing the first output voltage, other adjustment or processing circuits are not required, so that the circuit structure arranged in the charging box is simpler, the power consumption is effectively reduced, and the charging efficiency is improved.

In an embodiment of the application, a charging box is provided, including the foregoing adjustment control circuit and a first rechargeable battery, where the first rechargeable battery is configured to output the first output voltage, and the voltage input end is electrically connected to the first rechargeable battery. When the charging box charges the Bluetooth headset, the first rechargeable battery outputs the first output voltage to the voltage input end of the adjustment control circuit.

Because the adjustment control circuit is located in the charging box, the corresponding charged Bluetooth headset can be provided with only the second rechargeable battery and the working circuit, and other adjustment or processing circuits are not required, so that the circuit structure arranged in the Bluetooth headset is simpler, the power consumption is effectively reduced, and the charging efficiency is improved.

In an embodiment of the application, a charging system is provided, which includes a first terminal, a second terminal, and an adjustment control circuit. The first terminal comprises a first rechargeable battery, and the first rechargeable battery is used for receiving an external power supply and storing electric energy to output a first output voltage. The second terminal comprises a second rechargeable battery and a working circuit, and the second rechargeable battery is used for outputting driving voltage to supply power for the working circuit. The adjusting control circuit is arranged in the first terminal or the second terminal, when the second terminal is electrically connected with the first terminal, the adjusting control circuit is respectively electrically connected with the first rechargeable battery and the second rechargeable battery, compares the first output voltage with the driving voltage, and reduces the first output voltage to charge the second rechargeable battery if the driving voltage is smaller than the first output voltage; and if the driving voltage is larger than the first output voltage, raising the first output voltage to charge the second rechargeable battery.

Specifically, the first terminal is a charging box, the second terminal is a Bluetooth headset, the first rechargeable battery is arranged in the charging box, the second rechargeable battery and the working circuit are arranged in the Bluetooth headset, and the working circuit is used for playing audio signals. The adjusting control circuit is arranged in the charging box or the Bluetooth headset, and if the driving voltage is smaller than the first output voltage, the first output voltage is reduced and the second rechargeable battery is charged; and if the driving voltage is larger than the first output voltage, raising the first output voltage and charging the second rechargeable battery.

In an embodiment of the application, the adjustment control circuit includes a voltage input terminal, a voltage boosting circuit, a voltage reducing circuit, a logic control circuit, and a voltage output terminal. The voltage input end is electrically connected with the first rechargeable battery and is used for receiving the first output voltage, and the voltage output end is electrically connected with the second rechargeable battery. The voltage boosting circuit is electrically connected between the voltage input end and the voltage output end and used for boosting the first output voltage and outputting the first output voltage from the voltage output end to the second rechargeable battery. The voltage reducing circuit is electrically connected between the voltage input end and the voltage output end and is used for reducing the first output voltage and outputting the first output voltage from the voltage output end to the second rechargeable battery. The logic control circuit is electrically connected with the voltage input end, the voltage output end, the voltage boosting circuit and the voltage reducing circuit, and is used for comparing the voltage of the first output end of the voltage input end with the driving voltage of the voltage output, and outputting a control signal according to the obtained comparison result to select the voltage boosting circuit to boost the first output voltage or select the voltage reducing circuit to reduce the first output voltage. The second rechargeable battery can be charged by adjusting the voltage boosting circuit or the voltage reducing circuit in the control circuit to perform voltage boosting or voltage reducing processing for the first output voltage only once, so that the first output voltage output by the first rechargeable battery is matched with the second rechargeable battery.

In an embodiment of the present application, the control signal includes a first control signal and a second control signal. When the driving voltage is smaller than the first output voltage, the logic control circuit outputs the first control signal to the voltage boosting circuit and the voltage reducing circuit, and the first control signal controls the voltage boosting circuit to stop working and controls the voltage reducing circuit to perform voltage boosting processing; when the driving voltage is larger than the first output voltage, the logic control circuit outputs the second control signal to the voltage boosting circuit and the voltage reducing circuit, and the second control signal controls the voltage reducing circuit to stop working and controls the voltage boosting circuit to perform voltage boosting processing.

In an embodiment of the present application, the control signal includes a first control signal and a second control signal. When the driving voltage is smaller than the first output voltage, the logic control circuit outputs the first control signal to the voltage boosting circuit and the voltage reducing circuit, and the first control signal controls the voltage boosting circuit to stop working and controls the voltage reducing circuit to perform voltage boosting processing. When the driving voltage is larger than the first output voltage, the logic control circuit outputs the second control signal to the voltage boosting circuit and the voltage reducing circuit, and the second control signal controls the voltage reducing circuit to stop working and controls the voltage boosting circuit to perform voltage boosting processing.

In an embodiment of the application, the control signal further includes a third control signal, and when the bluetooth headset is not electrically connected with the charging box to perform charging and energy storage, the third control signal controls the voltage boosting circuit and the voltage reducing circuit to stop working. Therefore, when the Bluetooth headset is not electrically connected with the charging box to perform charging energy storage, the step-up circuit and the step-down circuit can be prevented from being in a working state to consume the electric energy stored in the first rechargeable battery, and the power consumption of the first rechargeable battery and the second rechargeable battery is reduced. The first control signal, the second control signal and the third control signal are different from each other, so that the first output voltage output by the first rechargeable battery is accurately controlled to charge the first rechargeable battery.

In an embodiment of the application, the adjustment control circuit further includes a path management circuit electrically connected to the logic control circuit, the voltage output terminal and the second rechargeable battery.

When the driving voltage output by the second rechargeable battery is smaller than the threshold voltage, the path management circuit controls the second rechargeable battery to be electrically disconnected from the working circuit and controls the voltage output end to be electrically conducted from one direction to the second rechargeable battery, the step-up circuit or the step-down circuit directly provides the first output voltage after being increased or reduced to the working circuit, and the path management circuit controls the step-up circuit or the step-down circuit to provide preset charging current to the second rechargeable battery to charge the second rechargeable battery.

When the driving voltage output by the second rechargeable battery is greater than the threshold voltage, the second rechargeable battery is electrically connected with the voltage output end, the step-up circuit or the step-down circuit provides the processed first output voltage to the second rechargeable battery for charging, and the second rechargeable battery outputs the driving voltage to the working circuit.

Because the driving voltage output by the second rechargeable battery is smaller than the threshold voltage and the working circuit cannot be driven to work normally, in this stage, the booster circuit can drive the working circuit to work quickly and timely to play audio signals or directly supply the first output voltage to the working circuit, and the working circuit is not required to be supplied to the second rechargeable battery after the second rechargeable battery is charged to the threshold voltage in advance, so that the starting time of the working circuit in the Bluetooth headset is effectively saved.

In an embodiment of the present application, the path management circuit includes a transistor, a gate of the transistor is electrically connected to the logic control circuit, a source of the transistor is electrically connected to the detection circuit, and a drain of the transistor is electrically connected to the voltage output terminal. When the driving voltage is smaller than a threshold voltage, the logic control circuit outputs a first switching voltage to the grid electrode to control the transistor to be in incomplete conduction, and the first switching voltage controls the transistor to unidirectionally provide the charging current from the drain electrode to the source electrode to the second rechargeable battery. When the charging voltage is greater than the threshold voltage, the first switch voltage controls the transistor to be fully conducted, the second rechargeable battery is electrically conducted with the voltage output end, the first output voltage after the voltage is increased or reduced is transmitted to the second rechargeable battery through the transistor, and the driving voltage output by the second rechargeable battery is transmitted to the working circuit through the transistor.

In an embodiment of the present application, the path management circuit further includes a detection circuit, where the detection circuit is electrically connected to the second rechargeable battery and is configured to detect a driving voltage and a charging current of the second rechargeable battery, and the logic control circuit adjusts a first switching voltage in real time according to the charging current obtained by detection, where the first switching voltage is used to control a conduction degree of a source drain of the transistor and the charging current. The detection circuit can accurately detect the charging current provided to the second rechargeable battery, and then the corresponding first switching voltage can be accurately provided to control the conduction degree of the transistor according to the charging current detected by the detection circuit.

In an embodiment of the present application, the second terminal includes two bluetooth headsets, and the charging box includes two adjustment control circuits, where each adjustment control circuit corresponds to one bluetooth headset, so as to effectively ensure that the adjustment control circuit in each bluetooth headset works independently and is not affected, and ensure that charging efficiency is effectively improved.

In an embodiment of the application, the adjustment is disposed in two bluetooth headsets, and each bluetooth headset is respectively provided with the adjustment control circuit. Therefore, the adjustment control circuit in each Bluetooth headset can be effectively ensured to work independently without being influenced, and the charging efficiency can be effectively improved.

Drawings

Fig. 1 is a schematic structural diagram of a charging system in a charging state according to an embodiment of the application;

FIG. 2 is a schematic diagram illustrating a charging system in an uncharged state according to an embodiment of the present application;

FIG. 3 is a block diagram of a charging circuit in a charging system according to a first embodiment of the present application;

FIG. 4 is a schematic diagram of a circuit configuration of a charging circuit in the charging system shown in FIG. 3;

fig. 5 is a schematic diagram of state of charge switching during charging of a bluetooth headset;

fig. 6 is a schematic diagram of a charging curve in a charging process of a bluetooth headset;

FIG. 7 is a block diagram of a charging circuit in a charging system according to a second embodiment of the present application;

FIG. 8 is a schematic diagram of a circuit configuration of the charging circuit in the charging system shown in FIG. 7;

fig. 9 is a schematic circuit diagram of a charging circuit in a charging system according to a third embodiment of the present application.

Detailed Description

The application is illustrated below with reference to specific examples.

Referring to fig. 1-2, fig. 1 is a schematic diagram illustrating a charging system 1 in a charged state according to an embodiment of the application, and fig. 2 is a schematic diagram illustrating a charging system 1 in an uncharged state according to an embodiment of the application. As shown in fig. 1-2, the charging system 1 includes a first terminal 10 and a second terminal 20, wherein when in a charging state, the first terminal 10 is electrically connected to the second terminal 20, and the first terminal 10 provides voltage and current to the second terminal 20 for charging, so that energy storage elements and components in the second terminal 20 store electric energy. The charging is performed to store the electric energy as the received voltage and current are added to the electric charge in the energy storage material, so that the energy storage material has gradually increased voltage and current after gradually receiving the current and voltage added to the electric charge, and the energy storage material is maintained at the preset voltage and current until the preset voltage and current are reached. When in the uncharged state, the second terminal 20 is separated from the first terminal 10 and is not electrically connected.

In this embodiment, the first terminal 10 is a charging box 10, and the second terminal 20 is a bluetooth headset, i.e. the charging system 1 includes two bluetooth headsets 20 and the charging box 10. The charging box 10 is used for accommodating the bluetooth headset 20, the charging box 10 charges the bluetooth headset 20, and the bluetooth headset 20 is charged by the charging box 10. For convenience of description, the identifier of the charging box directly adopts the identifier 10 of the first terminal 10, and the identifier of the bluetooth headset directly adopts the identifier 20 of the second terminal 20.

In other or alternative embodiments of the present application, the second terminal 20 may be an electronic terminal that needs to be charged for other functions, such as a wireless mouse, a wireless keyboard, a wearable headwear, a clothing ornament, glasses, a home ornament, etc., and the electronic terminal that needs to be charged is not limited to the above-listed terminal items.

Specifically, as shown in fig. 1-2, the charging system 1 includes a charging box 10 and two wireless bluetooth headsets 20, wherein the bluetooth headsets 20 do not need to use wires to electrically connect the headsets 20 with the audio signal playing device and the charging box 10. The bluetooth headset 20 receives an audio signal through bluetooth (bluetooth) communication and plays the audio signal.

As shown in fig. 1, when the bluetooth headset 20 is not in use, i.e. the bluetooth headset 20 is not worn by a user, the bluetooth headset 20 can be accommodated in an accommodating cavity (not labeled) of the charging box 10 and electrically connected with a charging interface (not labeled) of the charging box 10 to perform charging of the electric energy supplementary storage, as shown in fig. 2, when the bluetooth headset 20 is in use, the bluetooth headset 20 is taken out from the charging box 10 and worn on the ear of the user to perform audio signal playing. Wherein, the bluetooth headset 10 or the charging box 20 also has a display indication part (not labeled) for indicating the state of the bluetooth headset 20, so that the user can quickly and conveniently identify whether the bluetooth headset 20 is charged. For example, the bluetooth headset 10 or the charging box 20 is provided with an indicator lamp, and when the bluetooth headset 20 is accommodated in the accommodating cavity of the charging box 10 and is electrically connected with the charging interface of the charging box 10, the indicator lamp is turned on; when the bluetooth headset 20 is taken out from the accommodating cavity of the charging box 10 and is electrically disconnected from the charging interface of the charging box 10, the indicator light is turned off.

Referring to fig. 3, fig. 3 is a circuit block diagram of a charging circuit in the charging system 1 shown in fig. 1-2 according to a first embodiment of the present application, as shown in fig. 3, the charging box 10 includes a first charging input interface 10a, a first rechargeable battery 101 and a first charging output interface 10b, wherein the first rechargeable battery 101 is electrically connected to the first charging input interface 10a and the first charging output interface 10b, the first rechargeable battery 101 receives a charging voltage and a charging current provided from the outside from the first charging input interface 10a and converts the charging voltage and the charging current into electric energy for storage, and the first rechargeable battery 101 can output the stored electric energy from the first charging output interface 10b, and the output voltage is denoted as a first output voltage V1.

In this embodiment, the externally provided charging voltage may be a power source of 5V/12V converted from 220V ac voltage, and the first charging input interface 10a may be a USB2.0, a USB3.0, a USB Type-c interface, or the like, but may also be other charging interfaces, which is not limited thereto. In the charging cartridge 10, one or more first charging output interfaces 10b may be included, and the first charging output interfaces 10b may employ conductive contact spring plates. In the present embodiment, the first output voltage V1 is 3.0V to 4.4V.

In this embodiment, the two bluetooth headphones 20 are respectively corresponding to headphones adapted to the contour shape of the left and right ears, that is, the headphones 20 adapted to the left ear and the headphones 20 adapted to the right ear are separated, and although the shapes of the two bluetooth headphones 20 may be different, the circuit structures and the working principles of the working circuits in the two bluetooth headphones 20 are identical. Thus, for any one of the Bluetooth headset 20, the Bluetooth headset 20 includes a second charging input interface 20a, an adjustment control circuit 21, a second rechargeable battery 201, a driving voltage output terminal 20b, and an operating circuit 203. In this embodiment, the second rechargeable battery 201 is an energy storage component to be charged.

The second charging input interface 20a is electrically connected to the first charging output interface 10b and receives the first output voltage V1. The shape and structure of the second charging input interface 20a are adapted to those of the first charging output interface 10b, for example, when the first charging input interface 10b is two conductive contact ends in a concave shape, and correspondingly, the second charging input interface 20a is two conductive contact ends in a protruding shape. The adjustment control circuit 21 is electrically connected to the second charging interface 20a and the driving voltage output terminal 20b, and is configured to receive the first output voltage V1 from the second charging interface 20a, and perform a step-up or step-down process on the first output voltage V1 according to the first output voltage V1 and the reference voltage to provide the second charging battery 201 with a suitable voltage, so as to charge the second charging battery 201. In this embodiment, the reference voltage is the driving voltage V2 output from the second rechargeable battery 201. The adjustment control circuit 21 adjusts the magnitude of the first output voltage V1 output by the first rechargeable battery 101 according to the driving voltage V2 output by the second rechargeable battery 201 as a reference voltage, so that the first output voltage V1 is more matched with the driving voltage V2 of the second rechargeable battery 201, so as to facilitate quick and safe charging.

The second rechargeable battery 201 is electrically connected to the adjustment control circuit 21 and the driving voltage output terminal 20b, so that the self-adjustment control circuit 21 receives the first output voltage V1 after the voltage boosting process or the voltage dropping process to perform the charging energy storage, and outputs the driving voltage V2 to the working circuit 203 through the driving voltage output terminal 20b to drive the working circuit 203 to work. In this example, the working circuit 203 includes a speaker circuit for playing audio signals, a signal processing circuit for performing filtering, noise reduction, amplifying functions, and the like, the driving voltage V2 is the driving voltage V2 that is used as a VSYS network for reference to the working circuit 203, and other voltages different from the driving voltage V2 in the working circuit 203 are obtained after the processing of boosting, reducing, and the like on the basis of the driving voltage V2.

Specifically, the operation of the adjustment control circuit 21 is: when the driving voltage V2 is smaller than the first output voltage V1, the first output voltage V1 is lowered and the lowered first output voltage V1 is supplied to the second rechargeable battery 201 to charge it; when the driving voltage V2 is greater than the first output voltage V1, the first output voltage V1 is raised and the raised first output voltage V1 is supplied to the second rechargeable battery 201 to charge it.

In this embodiment, when the bluetooth headset 20 and the charging box 10 are in a charging state, the first charging output terminal 10b is electrically connected to the second charging input interface 20a, and the first rechargeable battery 101 provides a first output voltage V1 matched and adapted to the driving voltage V2 of the second rechargeable battery 201 to charge the second rechargeable battery 201; when the bluetooth headset 20 and the charging box 10 are in the uncharged state, the first charging output terminal 10b is electrically disconnected from the second charging input interface 20a, and the first charging output terminal 10b is suspended and does not output an electrical signal, and the second charging input interface 20a is also suspended and does not receive an electrical signal.

In this embodiment, the adjustment control circuit 21 may be an integrated charge management integrated circuit, that is, the adjustment control circuit 21 is a charge management chip.

As can be seen, the adjustment control circuit 21 can control only one voltage boosting circuit 211 to perform voltage boosting processing or only one voltage reducing circuit 212 to perform voltage reducing processing at the same time according to the magnitude of the driving voltage V2 and the first output voltage V1, so that on the charging path of the second rechargeable battery 201 in the bluetooth headset 20, only one voltage boosting processing or only one voltage reducing processing is performed, without performing voltage regulating processing of boosting and reducing multiple times, thereby effectively reducing power consumption and improving charging efficiency.

Fig. 4 is a schematic circuit diagram of a charging circuit in the charging system 1 shown in fig. 3.

As shown in fig. 3, the adjustment control circuit 21 includes a voltage input terminal 21a, a voltage boosting circuit 211, a voltage reducing circuit 212, a logic control circuit 210, and a voltage output terminal 21b.

The voltage input end 21a is electrically connected to the second charging input interface 20a, and when the bluetooth headset 20a and the charging box 10 are electrically connected to the second charging input interface 20 through the first charging output end 10b, the voltage input end 21a is directly electrically connected to the first charging output interface 10b of the first rechargeable battery 101 to receive the first output voltage V1. When the bluetooth headset 20 is not electrically connected to the charging box 10, the voltage input terminal 21a and the second charging input interface 20a are suspended and do not receive the first output voltage V1.

The voltage output terminal 21b is electrically connected to the driving voltage output terminal 20b and the second rechargeable battery 201.

The boost circuit 211 is electrically connected between the voltage input terminal 21a and the voltage output terminal 21b, and is configured to boost the first output voltage V1 received from the voltage input terminal 21a, and output the first output voltage V1 from the voltage output terminal 21b to the second rechargeable battery 201. In this embodiment, the BOOST circuit 211 may be implemented by a BOOST circuit module.

The voltage step-down circuit 212 is electrically connected between the voltage input terminal 21a and the voltage output terminal 21b, and is configured to step down the first output voltage V1 received from the voltage input terminal 21a, and output the first output voltage V1 from the voltage output terminal 21b to the second rechargeable battery 201. In this embodiment, the BUCK circuit 212 can be implemented by a BUCK module or a low dropout linear regulator (low dropout regulator, LDO).

The logic control circuit 210 is electrically connected to the voltage input terminal 21a and the voltage output terminal 21b, and is electrically connected to the voltage boosting circuit 211 and the voltage reducing circuit 212 through control buses. The logic control circuit 210 compares the magnitude difference between the first output voltage V1 at the voltage input terminal 21a and the driving voltage V2 at the voltage output terminal 21b, i.e. compares the magnitude difference between the first output voltage V1 provided by the first rechargeable battery 101 and the driving voltage V2 at the second rechargeable battery 201. Then, the logic control circuit 210 further selects the voltage boosting circuit 211 to perform boosting of the first output voltage V1 or the voltage lowering circuit 212 to decrease the first output voltage V1 by controlling the bus output control signal according to the obtained comparison result.

The logic control circuit 210 further includes a first signal output terminal C1 and a second signal output terminal C2, the first signal output terminal C1 is electrically connected to the voltage step-down circuit 212 through the control BUS, and the second signal output terminal C2 is electrically connected to the voltage step-up circuit 211 through the control BUS.

Correspondingly, the control bus includes two mutually independent conductive traces (not shown), wherein one conductive trace is respectively connected between the first signal output terminal C1 and the boost circuit 211, and the other conductive trace is electrically connected between the second signal output terminal C2 and the boost circuit 212.

Specifically, the control signals include a first control signal, a second control signal, and a third control signal. The first to third control signals may be digital logic signals corresponding to the first signal output terminal C1 and the second signal output terminal C2, for example, the first to third control signals are represented by binary logic values of 10, 01, and 00. Wherein, 1 is characterized by high level, 0 is characterized by low level, when the digital logic signal of high level is used to control the voltage boosting circuit 211 and the voltage reducing circuit 212 to be in working state, namely to execute voltage boosting or voltage reducing process; the low-level digital logic signal is used to control the voltage boosting circuit 211 and the voltage reducing circuit 212 to be in a non-operating state, i.e. to not perform voltage boosting and voltage reducing processes.

In other embodiments of the present application, the low-level digital logic signal is used to trigger the start-up of the voltage boosting circuit 211 and the voltage reducing circuit 212 to be in an operating state, i.e. the low-level digital logic signal is used to control the voltage boosting circuit 211 and the voltage reducing circuit 212 to perform voltage boosting or voltage reducing process; the high-level digital logic signal is used to stop triggering and start the operation state of the voltage boosting circuit 211 and the voltage reducing circuit 212, that is, the high-level digital logic signal is used to control the voltage boosting circuit 211 and the voltage reducing circuit 21 to stop executing the voltage boosting or voltage reducing process.

In the present embodiment, the adjustment control circuit 21 is a charge management integrated circuit that integrates the voltage boosting circuit 211, the voltage reducing circuit 212 and the logic control circuit 210 on a circuit substrate, i.e. a charge management chip that integrates the voltage boosting circuit 211, the voltage reducing circuit 212 and the logic control circuit 210 on a circuit substrate.

Referring to fig. 4, fig. 5 and fig. 6, fig. 5 is a schematic diagram of state of charge switching during charging of the bluetooth headset, and fig. 6 is a schematic diagram of charging curve during charging of the bluetooth headset.

As shown in fig. 6, the line corresponding to the first output voltage represents the change in voltage with time during the charging of the first output voltage V1 output by the first rechargeable battery 101. The lines of the regulation control circuit output voltage and the second rechargeable battery control voltage characterize the change of the voltage output terminal 21b and the voltage of the second rechargeable battery 201 over time during charging. When the bluetooth headset 20 is accommodated in the charging box 10 for charging, if the operating circuit 203 in the bluetooth headset 20 is not in an operating state, the second rechargeable battery 201 in the bluetooth headset 20 is in an idle state, and therefore, the idle voltage of the second rechargeable battery 201 is substantially the same as the voltage output from the voltage output terminal 21b by the adjustment control circuit 21, and in view of the existence of the wire resistance, the idle voltage of the second rechargeable battery 201 is slightly smaller than the voltage output by the adjustment control circuit 21. The line corresponding to the second rechargeable battery charging current characterizes the change in current over time during charging of the second rechargeable battery 201.

For the second rechargeable battery 201, as the charging time continues, the charging voltage and the charging current of the second rechargeable battery 201 during the charging and energy storage process may be divided into three phase regions: trickle charge region, constant current charge region and constant voltage charge region.

In the trickle charge region, the first rechargeable battery 201 charges and stores energy at a lower threshold voltage and a lower charging current, and the threshold voltage may be 3.0V; in the constant current charging circuit, the first rechargeable battery 201 performs rapid charging and energy storage under a constant charging voltage and a gradually increasing charging voltage; when the first rechargeable battery 201 has a voltage reaching the highest voltage, for example, a voltage reaching 4.4V, the second rechargeable battery 201 enters a constant voltage charging region, at which the charging current gradually decreases. When the driving voltage V2 is smaller than the first output voltage V1 as shown in fig. 5, the logic control circuit 210 outputs binary 10 as the first control signal in coordination with the time T1 in the period of time before the time point Tx as shown in fig. 6, and transmits from the first signal terminal C1 and the second signal terminal C2 to the voltage boosting circuit 211 and the voltage reducing circuit 212, the first control signal then controls the voltage boosting circuit 211 to stop operation and controls the voltage reducing circuit 212 to perform voltage boosting. For example, when the first output voltage V1 of the first rechargeable battery 101 is 4.0V and the driving voltage V2 of the second rechargeable battery 201 is 3.3V, a binary first control signal of 10 is output to the voltage boosting circuit 211 and the voltage reducing circuit 212. In this example, at the time point Tx, the first output voltage V1 is the same as the driving voltage V2.

The voltage boosting circuit 211 is in an inactive state under the control of the first control signal, and does not perform voltage boosting. The step-down circuit 212 then performs a step-down process for the first output voltage V1, for example, to reduce the first output voltage V1 to 3.5V to match the 3.5V voltage of the second rechargeable battery 201, thereby performing constant current charging on the second battery 201.

In other embodiments of the present application, when the driving voltage V2 is smaller than the first output voltage V1 and at time T1, the logic control circuit 210 outputs only the binary 1 representing the high level as the first control signal, and outputs the first control signal to the voltage step-down circuit 212 through the first signal terminal C1 to trigger and control the voltage step-down circuit 212 to be in the operation state, and performs the voltage step-down process for the first output voltage V1. The voltage boosting circuit 211 is in an initial non-operating state because it does not receive the trigger start signal, and does not perform the voltage boosting process. When the driving voltage V2 is greater than the first output voltage V1 as shown in fig. 6, the logic control circuit 210 outputs a binary 01 as a second control signal to the voltage boosting circuit 211 and the voltage reducing circuit 212 in coordination with a time T2 in a period of time after the time point Tx as shown in fig. 5, the second control signal controlling the voltage reducing circuit 212 to stop operating and controlling the voltage boosting circuit to perform the voltage boosting operation. For example, when the first output voltage V1 of the first rechargeable battery 101 is 3.6V and the driving voltage V2 of the second rechargeable battery 201 is 4V, the binary second control signal of 10 is output to the voltage boosting circuit 211 and the voltage reducing circuit 212.

The voltage step-down circuit 212 is in an inactive state under the control of the second control signal without performing voltage step-down, thereby ensuring the accuracy of the step-up processing performed by the voltage step-up circuit 212 with respect to the first output voltage V1. The voltage boosting circuit 211 performs a voltage boosting process for the first output voltage V1, for example, boosting the first output voltage V1 to 4V to match the 4V voltage of the second rechargeable battery 201, thereby performing constant current charging on the second battery 201.

In other embodiments of the present application, when the driving voltage V2 is greater than the first output voltage V1 and at time T2, the logic control circuit 210 outputs only the binary 1 representing the high level as the second control signal, and outputs the second control signal to the boost circuit 211 through the second signal terminal C1, thereby triggering and controlling the boost circuit 211 to be in the operating state, and performing the boost processing for the first output voltage V1. And the voltage step-down circuit 212 is in an initial non-operating state because it does not receive the trigger start signal, and does not perform the voltage step-down process. Further, when the bluetooth headset 20 is not placed in the charging box 10, that is, the second charging input interface 20a of the bluetooth headset 20 is not in conductive contact with the first charging input interface 10a of the charging box 10, it is indicated that the bluetooth headset 20 is not performing charging, the logic control circuit 210 outputs binary 00 as a third control signal to the voltage boosting circuit 211 and the voltage reducing circuit 212, and the third control signal controls the voltage boosting circuit 211 and the voltage reducing circuit 212 to stop working. Therefore, when the bluetooth headset 20 is not accurately electrically connected with the charging box 10, the voltage boosting circuit 211 and the voltage reducing circuit 212 are not in the working state, thereby reducing the power consumption of the charging box 10.

In this embodiment, the adjustment control circuit 21 is located in the charging box 10, and the corresponding bluetooth headset 20 may only set the second rechargeable battery 201 and the working circuit 203, without setting other circuits for adjusting or processing the first output voltage V1 provided from the charging box, so that the circuit structure set in the bluetooth headset 20 is simpler, and the power consumption is effectively reduced and the charging efficiency is improved. In addition, the charging system 1 includes two bluetooth headsets 20, two adjustment control circuits 21 are included in the corresponding charging box 10, and each adjustment control circuit 21 corresponds to one bluetooth headset 20, so that the adjustment control circuits 21 in each bluetooth headset 20 can be effectively ensured to work independently without being influenced, and charging efficiency can be effectively improved.

Referring to fig. 7, which is a circuit block diagram of a charging system according to a second embodiment of the present application, as shown in fig. 7, the charging system 1 includes a charging box 10 and two bluetooth headsets 20, wherein the bluetooth headsets 20 receive audio signals and play audio signals in a bluetooth manner, and the bluetooth headsets 20 can be accommodated in the charging box 10 for electric energy supplementary storage.

In the present embodiment, the charging case 10 and the two bluetooth headsets 20 are identical to the charging case 10 and the two bluetooth headsets 20 in the first embodiment in terms of shape, structure and operation principle, and the difference is only that the adjustment control circuit 21 is disposed in the charging case 10.

Specifically, the charging box 10 includes a first charging input interface 10a (not labeled), a first rechargeable battery 101, an adjustment control circuit 21, and a first charging output interface 10b, wherein the first rechargeable battery 101 is electrically connected to the first charging interface 10a (not labeled), the first rechargeable battery 101 receives a charging voltage provided from the outside from the first charging input interface 10a and converts the charging current into electric energy for storage, and the first rechargeable battery 101 outputs a first output voltage V1 according to the stored electric energy.

The first charging input interface 10b is electrically connected to the second rechargeable battery 201 of the bluetooth headset 20, and the second rechargeable battery 201 obtains a charging current and a charging voltage from the charging box 10, converts the charging current and the charging voltage into electrical energy, and outputs a driving voltage V2 correspondingly.

The adjustment control circuit 21 is electrically connected to the first rechargeable battery 101 and the first charging output interface 10b, and is configured to receive the first output voltage V1 from the first rechargeable battery, and to boost or step down the first output voltage according to a difference between the first output voltage V1 and the driving voltage V2 output by the second rechargeable battery 201, and then transmit the first output voltage to the first charging output interface 10b, and further provide the first output voltage to the second rechargeable battery 201 to charge the second rechargeable battery 201.

Specifically, when the driving voltage V2 is smaller than the first output voltage V1, the first output voltage V1 is lowered and the lowered first output voltage V1 is supplied to the second rechargeable battery 201 to charge it; when the driving voltage V2 is greater than the first output voltage V1, the first output voltage V1 is raised and the raised first output voltage V1 is supplied to the second rechargeable battery 201 to charge it.

The bluetooth headset 20 includes a second charging input interface 20a, a second rechargeable battery 201, a driving voltage output terminal 20b, and an operating circuit 203. The second charging input interface 20a is electrically connected to the first charging output interface 10b, and the driving voltage output end 20b is electrically connected to the working circuit 203. The second rechargeable battery 201 is directly and electrically connected to the second charging interface 20a and the driving voltage output terminal 20b, and the second rechargeable battery 201 receives the first output voltage V1 from the second charging interface 20a after the step-up or step-down process of the adjustment control circuit 21, so as to perform charging and electric energy storage, and outputs the driving voltage V2 to the working circuit 203 through the driving voltage output terminal 20b to drive the working circuit 203 to work. In this embodiment, when the bluetooth headset 20 and the charging box 10 are in a charging state, the first charging output terminal 10b is electrically connected to the second charging input interface 20a, and the first rechargeable battery 101 provides a first output voltage V1 matched and adapted to the driving voltage V2 of the second rechargeable battery 201 to charge the second rechargeable battery 201; when the bluetooth headset 20 and the charging box 10 are in the uncharged state, the first charging output terminal 10b is electrically disconnected from the second charging input interface 20a, and the first charging output terminal 10b is suspended and does not output an electrical signal, and the second charging output interface 20b is suspended and does not receive an electrical signal.

Please refer to fig. 8, which is a schematic diagram illustrating a specific circuit structure of the charging system shown in fig. 7 with respect to the charging circuit. As shown in fig. 8, the adjustment control circuit 21 includes a voltage input terminal 21a, a voltage boosting circuit 211, a voltage reducing circuit 212, a logic control circuit 210, and a voltage output terminal 21b.

The voltage input terminal 21a is electrically connected to the first rechargeable battery 101 to receive the first output voltage V1.

The voltage output terminal 21b is electrically connected to the first charging output interface 10b, so that the driving voltage output terminal 20b is electrically connected to the second rechargeable battery 201 through the first charging output interface 10 b.

When the bluetooth headset 20 and the charging box 10 are electrically connected to the second charging input interface 20a through the first charging output terminal 10b, the voltage output terminal 21b is electrically connected to the second charging input interface 20a to output the first output voltage V1 after being raised or lowered to the second rechargeable battery 201. When the bluetooth headset 20 is not electrically connected to the charging box 10, the voltage output end 21b is suspended from the first charging output end 10b and is not electrically connected to the second rechargeable battery 201.

The boost circuit 211 is electrically connected between the voltage input terminal 21a and the voltage output terminal 21b, and is configured to boost the first output voltage V1 received from the voltage input terminal 21a, and output the first output voltage V1 from the voltage output terminal 21b to the second rechargeable battery 201.

The voltage step-down circuit 212 is electrically connected between the voltage input terminal 21a and the voltage output terminal 21b, and is configured to step down the first output voltage V1 received from the voltage input terminal 21a, and output the first output voltage V1 from the voltage output terminal 21b to the second rechargeable battery 201.

The logic control circuit 210 is electrically connected to the voltage input terminal 21a and the voltage output terminal 21b, and is electrically connected to the voltage boost circuit 211 and the voltage step-down circuit 212 through the control BUS, and is configured to compare a magnitude difference between the first output terminal voltage V1 provided by the voltage input terminal 21a and the driving voltage V2 provided by the voltage output terminal 21b, i.e. a magnitude difference between the first output terminal voltage V1 provided by the first rechargeable battery 101 and the driving voltage V2 provided by the second rechargeable battery 201. And the logic control circuit 210 further selects the voltage boosting circuit 211 to perform boosting of the first output voltage V1 or the voltage lowering circuit 212 to decrease the first output voltage V1 through the control BUS output control signal according to the obtained comparison result.

The logic control circuit 210 includes a first signal output terminal C1 and a second signal output terminal C2, the first signal output terminal C1 is electrically connected to the voltage step-down circuit 212 through the control BUS, and the second signal output terminal C2 is electrically connected to the voltage step-up circuit 211 through the control BUS.

Specifically, the control signals include a first control signal, a second control signal, and a third control signal. The first to third control signals may be digital logic signals corresponding to the first signal output terminal C1 and the second signal output terminal C2, for example, control signals represented by binary logic values of 10, 01, and 00.

In this embodiment, the operation process and principle of the adjustment control circuit 21 are the same as those of the adjustment control circuit 21 shown in fig. 3 to 4 in the first embodiment, and the description thereof is omitted.

In this embodiment, the adjustment control circuit 21 is located in the bluetooth headset 20. The corresponding charging box 10 may only be provided with the first rechargeable battery 101, and no other circuit for adjusting or processing the first output voltage V1 to be output to the bluetooth headset is required, so that the circuit structure provided in the charging box 10 is more concise, and the power consumption is effectively reduced and the charging efficiency is improved.

The charging system 1 comprises two bluetooth headsets 20, and each bluetooth headset 20 is provided with the adjusting control circuit 21. Thereby effectively ensuring that the adjustment control circuit 21 in each Bluetooth headset 20 works independently without being affected, and ensuring that the charging efficiency is effectively improved.

Referring to fig. 9, which is a schematic circuit diagram of a charging circuit in the charging system 1 according to the third embodiment of the present application, as shown in fig. 9, the charging system 1 includes a charging box 10 and two bluetooth headsets 20, wherein the bluetooth headsets 20 receive audio signals and play audio signals in a bluetooth manner, and the bluetooth headsets 20 can be accommodated in the charging box 10 for electric energy supplementary storage. In this embodiment, the charging box 10 and the two bluetooth headsets 20 are identical to the charging box 10 and the two bluetooth headsets 20 in the first embodiment in terms of shape, structure and operation principle, except that the adjustment control circuit 21 further includes a path management circuit 213. The adjustment control circuit 21 includes a voltage input terminal 21a, a voltage boosting circuit 211, a voltage reducing circuit 212, a logic control circuit 210, a path management circuit 213, and a voltage output terminal 21b.

The path management circuit 213 is configured to electrically disconnect the second rechargeable battery 201 from the operating circuit 203 when the driving voltage V2 output by the second rechargeable battery 201 is less than the threshold voltage Vf, the voltage boost circuit 210 or the voltage buck circuit 212 directly provides the first output voltage V1 to the operating circuit 203, and the charge management path circuit 213 controls the voltage boost circuit 211 or the voltage buck circuit 212 to provide a preset charging current to the second rechargeable battery 201 to charge and store energy for the second rechargeable battery.

In the present embodiment, the path management circuit 213 is configured to control the second rechargeable battery 201 to output the driving voltage V2 when the driving voltage V2 is smaller than the threshold voltage Vf, and the adjustment control circuit 21 is turned on unidirectionally with the second rechargeable battery 201, that is, the adjustment control circuit 21 supplies the charging voltage and the charging current to the second rechargeable battery 201 unidirectionally, and the second rechargeable battery 201 does not output the driving voltage to the operating circuit 203.

Specifically, the voltage input end 21a is electrically connected to the second charging input interface 20a, i.e. directly electrically connected to the first charging output interface 10b of the first rechargeable battery 101, so as to receive the first output voltage V1. The voltage output terminal 21b is directly electrically connected to the driving voltage output terminal 20b.

The path management circuit 213 is electrically connected to the logic control circuit 210, the voltage output terminal 21b, and the second rechargeable battery 201.

The logic control circuit 210 includes a first signal output terminal C1, a second signal output terminal C2, and a third signal output terminal C3, where the first signal output terminal C1 is electrically connected to the voltage step-down circuit 212 through the control BUS, and the second signal output terminal C2 is electrically connected to the voltage step-up circuit 212 through the control BUS. The third signal terminal C3 is directly electrically connected to the path management circuit 213 through the conductive trace.

The control signals comprise a first control signal, a second control signal and a third control signal. The first to third control signals may be digital logic signals corresponding to the first signal output terminal C1 and the second signal output terminal C2, for example, the first to third control signals are represented by binary logic values of 10, 01, and 00. Wherein, 1 is characterized by high level, 0 is characterized by low level, when the digital logic signal of high level is used to control the voltage boosting circuit 211 and the voltage reducing circuit 212 to be in working state, namely to execute voltage boosting or voltage reducing process; the low-level digital logic signal is used to control the voltage boosting circuit 211 and the voltage reducing circuit 212 to be in a non-operating state, i.e. to not perform voltage boosting and voltage reducing processes.

Further, the path management circuit 213 includes a control terminal 213a, a first connection terminal 213b, a second connection terminal 213c, a transistor Q1, and a detection circuit 2131. The control end 213a is electrically connected to the third signal output end C3 of the logic control circuit 210, the first connection end 213a is electrically connected to the voltage output end 21b, and the second connection end 213C is electrically connected to the second rechargeable battery 201.

The gate G of the transistor Q1 is electrically connected to the control terminal 213a, the source S of the transistor Q1 is electrically connected to the detection circuit 2131, and the drain D of the transistor is electrically connected to the voltage output terminal 21b. In this embodiment, the transistor Q1 is a P-type field effect transistor (MOS transistor), and alternatively, in other embodiments of the present application, the transistor Q1 may be an N-type field effect transistor (MOS transistor).

The detection circuit 2131 is electrically connected to the source S of the transistor Q1, the second connection terminal 213c and the logic control circuit 210, and is configured to detect the driving voltage V2 output by the second rechargeable battery 201 and the received charging current (not shown), and feedback the detection result to the logic control circuit 210. When the driving voltage V2 is less than the threshold voltage Vf, the logic control circuit 210 outputs the first switching voltage from the third signal output terminal C3 and transmits the first switching voltage to the gate G of the transistor Q through the control terminal 213a to control the turn-on degree of the transistor Q1.

The drain electrode of the transistor Q1 is electrically connected to the driving voltage output terminal 20b, and the driving voltage output terminal 20b provides a voltage of 3.0-4.4V capable of directly driving the working circuit 203 to work, and the voltage is greater than the turn-on threshold voltage of the transistor Q1, so that the transistor Q1 is in a turn-on constant current region, and in this way, when different gate-source voltages Vgs correspond to different pinch-off region areas, that is, the transistor Q can be controlled to be in different turn-on degrees, so as to output different drain currents.

When the gate G of the transistor Q1 receives a different first switching voltage, the transistor Q1 is in a different on state, corresponding to a different drain current Ids (not shown) transmitted from the drain D to the source S of the transistor, that is, by controlling the on degree of the transistor Q1, a different charging current provided to the second rechargeable battery 201 can be controlled.

In the present embodiment, the threshold voltage Vf is a charging voltage when the second rechargeable battery 201 is in the trickle charge state, for example, 3.0V, and when the driving voltage V2 is smaller than the threshold voltage Vf, the operating circuit 203 cannot be driven to operate normally. Thus, when the second rechargeable battery 201 is in the trickle charge region, the charge safety of the second rechargeable battery 201 in the low voltage and low current state is ensured. Meanwhile, the first switch voltage control transistor Q1 is in a non-fully conductive state, i.e., the source S and the drain D are not electrically and fully electrically conductive, and at this time, the current of the transistor Q1 only flows from the drain D to the source S, but no current flows from the source S to the drain D, so that the current and the voltage in the path management circuit 213 are electrically conductive from the first connection terminal 213b to the second connection terminal 213c, i.e., the current and the voltage are only transmitted from the first connection terminal 213b to the second connection terminal 213c, and no current and voltage are transmitted from the second connection terminal 213c to the first connection terminal 213 b. Since the path management circuit 213 is electrically connected from the first connection terminal 213b to the second connection terminal 213c in one direction, only the charging voltage and the charging current of the voltage output terminal 21b are transmitted to the second rechargeable battery 201 through the transistor Q1 and the detection circuit 2131 in the path management circuit 213, and the second rechargeable battery 201 does not output the driving voltage V2 to the operation circuit 203.

The second rechargeable battery 201 is electrically disconnected from the working circuit 203, and no driving voltage is required to be provided for the working circuit 203, so that the working circuit 203 can work normally without being affected by the second rechargeable battery 201.

The step-up circuit 210 or the step-down circuit 212 directly provides the first output voltage V1 to the working circuit 203, so as to drive the working circuit 203 to work quickly and timely to play the audio signal, and the second rechargeable battery 201 does not need to be charged to the threshold voltage Vf in advance and then provided to the working circuit 203, so that the starting time of the working circuit 203 in the bluetooth headset 20 is effectively saved.

When the driving voltage V2 is greater than the threshold voltage Vf, that is, the second rechargeable battery 201 can drive the working circuit 203 to work normally, the first switching voltage control transistor Q1 provided by the logic control circuit 210 is in a fully-on state, that is, the source S and the drain D can transmit current and voltage in both directions, and the direction from the first connection terminal 213b to the second connection terminal 213c and the direction from the second connection terminal 213c to the first connection terminal 213b can transmit voltage and current in both directions. Accordingly, the second rechargeable battery 201 is electrically connected to the driving voltage output terminal 20b, and the step-up circuit 211 or the step-down circuit 213 charges the second rechargeable battery 201 with the first output voltage V1 after the step-up or step-down process, and at the same time, the second rechargeable battery 201 outputs the driving voltage V1 to the operation circuit 203, so as to drive the operation circuit 203 to operate normally.

While the foregoing is directed to the preferred embodiments of the present application, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the application, such changes and modifications are also intended to be within the scope of the application.

Claims

1. The adjusting control circuit is characterized by being arranged in a Bluetooth headset or a charging box, wherein the charging box comprises an accommodating space for accommodating the Bluetooth headset in the Bluetooth headset when audio playing is not performed by the Bluetooth headset and is used for providing a power supply for charging the Bluetooth headset, the adjusting control circuit comprises a voltage input end and a voltage output end, when the adjusting control circuit receives a first output voltage from the voltage input end from a rechargeable battery of the charging box, the first output voltage is compared with a reference voltage, and if the reference voltage is smaller than the first output voltage, the first output voltage is reduced and the first output voltage is output from the voltage output end; if the reference voltage is larger than the first output voltage, raising the first output voltage and outputting the first output voltage from the voltage output end;

the voltage output end is used for being electrically connected with an energy storage component to be charged, the reference voltage is a driving voltage of the energy storage component, and the energy storage component outputs the driving voltage to the working circuit through the voltage output end;

The adjustment control circuit further comprises a path management circuit, wherein the path management circuit comprises a control end, a first connecting end and a second connecting end, the first connecting end is used for being electrically connected with the voltage output end, and the second connecting end is used for being electrically connected with the energy storage component;

the path management circuit comprises a transistor, a grid electrode of the transistor is electrically connected with the control end, a source electrode of the transistor is electrically connected with the second connection end, a drain electrode of the transistor is electrically connected with the first connection end, when the driving voltage is smaller than a threshold voltage, a first switching voltage is output to the grid electrode to control the transistor to be incompletely conducted, the first switching voltage controls the transistor to unidirectionally transmit a preset charging current from the drain electrode to the source electrode to the energy storage component to charge the energy storage component, so that the energy storage component is charged in a trickle charging area, the energy storage component stops outputting the driving voltage to the working circuit, and the first output voltage after rising or falling is transmitted to the working circuit.

2. The regulation control circuit of claim 1, wherein the regulation control circuit comprises a boost circuit, a buck circuit, and a logic control circuit;

The voltage boosting circuit is electrically connected between the voltage input end and the voltage output end, and is used for boosting the first output voltage received from the voltage input end and outputting the first output voltage from the voltage output end;

the voltage reducing circuit is electrically connected between the voltage input end and the voltage output end and is used for reducing the first output voltage received from the voltage input end and outputting the first output voltage from the voltage output end;

the logic control circuit is electrically connected with the voltage input end, the voltage output end, the voltage boosting circuit and the voltage reducing circuit, and is used for comparing the voltage of the first output end of the voltage input end with the reference, and outputting a control signal according to the obtained comparison result to select the voltage boosting circuit to boost the first output voltage or reduce the first output voltage.

3. The tuning control circuit of claim 2, wherein the control signal comprises a first control signal and a second control signal;

when the reference voltage is smaller than the first output voltage, outputting the first control signal to the voltage reduction circuit to control the voltage reduction circuit to perform voltage boosting processing;

When the reference voltage is larger than the first output voltage, the second control signal is output to the voltage boosting circuit to control the voltage boosting circuit to perform voltage boosting processing.

4. The tuning control circuit of claim 2, wherein the control signal comprises a first control signal and a second control signal;

when the reference voltage is smaller than the first output voltage, the logic control circuit outputs the first control signal to the voltage boosting circuit and the voltage reducing circuit, and the first control signal controls the voltage boosting circuit to stop working and controls the voltage reducing circuit to perform voltage boosting processing;

when the reference voltage is larger than the first output voltage, the logic control circuit outputs the second control signal to the voltage boosting circuit and the voltage reducing circuit, and the second control signal controls the voltage reducing circuit to stop working and controls the voltage boosting circuit to perform voltage boosting processing.

5. The regulation and control circuit of claim 4, wherein the control signal further comprises a third control signal that controls the boost circuit and the buck circuit to stop operating when the first output voltage is not received at the voltage input terminal or the voltage output terminal is suspended.

6. The tuning control circuit of any one of claims 2-5, wherein the control terminal is configured to be electrically connected to the logic control circuit;

when the driving voltage output by the energy storage component is smaller than a threshold voltage, the path management circuit controls the first connecting end to be electrically conducted to the second connecting end in a one-way mode, the step-up circuit or the step-down circuit outputs the first output voltage after being increased or reduced from the voltage output end, and the step-up circuit or the step-down circuit provides preset charging current to the second connecting end through the path management circuit;

when the driving voltage output by the energy storage component is greater than the threshold voltage, the path management circuit controls the second connection end to be electrically conducted with the first connection end, and the step-up circuit or the step-down circuit outputs the first output voltage after being increased or reduced from the second connection end to the voltage output end through the path management circuit.

7. The regulation and control circuit of claim 6, wherein the first switching voltage controls the transistor to be fully turned on when the charging voltage is greater than the threshold voltage, the second connection terminal is electrically turned on with the first connection terminal, and the increased or decreased first output voltage is transmitted to the second connection terminal through the transistor.

8. The adjustment control circuit of claim 7, wherein the path management circuit further comprises a detection circuit electrically connected between the second connection terminal and the source of the transistor for detecting the driving voltage and the charging current, and the logic control circuit adjusts the magnitude of the first switching voltage in real time according to the charging current obtained by detection, and the first switching voltage is used for controlling the conduction degree of the transistor and the magnitude of the charging current.

9. The Bluetooth headset is characterized by comprising the adjusting control circuit, a second rechargeable battery and a working circuit according to any one of claims 1-8, wherein the second rechargeable battery and the working circuit are electrically connected to the voltage output end, the second rechargeable battery is used as the energy storage component to output the driving voltage to supply power for the working circuit, the second rechargeable battery is charged by the first output voltage after rising or falling, and the working circuit is used for outputting an audio signal.

10. The bluetooth headset of claim 9, wherein the adjustment control circuit receives the first output voltage from a charging box when the bluetooth headset is charged.

11. A charging box, characterized by comprising the regulation control circuit of any one of claims 1-8 and a first rechargeable battery, wherein the first rechargeable battery is used for outputting the first output voltage, and the voltage input end is electrically connected with the first rechargeable battery.

12. The charging cartridge of claim 11, wherein the first rechargeable battery outputs the first output voltage to a voltage input of the regulation control circuit when the charging cartridge charges the bluetooth headset.

13. A charging system is characterized by comprising a first terminal, a second terminal and an adjustment control circuit, wherein,

the first terminal includes a first rechargeable battery for receiving an external power source and storing electric energy to output a first output voltage;

the second terminal comprises a second rechargeable battery and a working circuit, and the second rechargeable battery is used for outputting driving voltage to supply power for the working circuit;

the first terminal comprises an accommodating space for accommodating the second terminal therein when the second terminal does not work;

the adjusting control circuit is arranged in the first terminal or the second terminal, when the second terminal is electrically connected with the first terminal, the adjusting control circuit is respectively electrically connected with the first rechargeable battery and the second rechargeable battery, compares the first output voltage with the driving voltage, and reduces the first output voltage to charge the second rechargeable battery if the driving voltage is smaller than the first output voltage; if the driving voltage is greater than the first output voltage, raising the first output voltage to charge the second rechargeable battery;

The adjusting control circuit further comprises a path management circuit, wherein the path management circuit comprises a control end, a first connecting end and a second connecting end, the first connecting end is used for being electrically connected with the working circuit, and the second connecting end is used for being electrically connected with the second rechargeable battery;

the path management circuit comprises a transistor, a grid electrode of the transistor is electrically connected with the control end, a source electrode of the transistor is electrically connected with the second connection end, a drain electrode of the transistor is electrically connected with the first connection end, when the driving voltage is smaller than a threshold voltage, a first switching voltage is output to the grid electrode to control the transistor to be incompletely conducted, the first switching voltage controls the transistor to unidirectionally transmit a preset charging current from the drain electrode to the source electrode to the second rechargeable battery to charge the second rechargeable battery, so that the second rechargeable battery is charged in a trickle charging area, the second rechargeable battery stops outputting the driving voltage to the working circuit, and meanwhile, the first output voltage after rising or falling is transmitted to the working circuit.

14. The charging system of claim 13, wherein the first terminal is a charging cartridge and the second terminal is a bluetooth headset, wherein,

The first rechargeable battery is arranged in the charging box;

the second rechargeable battery and the working circuit are arranged in the Bluetooth headset, and the working circuit is used for playing audio signals;

the adjusting control circuit is arranged in the charging box or the Bluetooth headset.

15. The charging system of claim 14, wherein the regulation control circuit comprises a voltage input, a boost circuit, a buck circuit and logic control circuit, and a voltage output;

the voltage input end is electrically connected with the first rechargeable battery and is used for receiving the first output voltage;

the voltage output end is electrically connected with the second rechargeable battery;

the voltage boosting circuit is electrically connected between the voltage input end and the voltage output end, and is used for boosting the first output voltage and outputting the first output voltage from the voltage output end to the second rechargeable battery;

the voltage reducing circuit is electrically connected between the voltage input end and the voltage output end, and is used for reducing the first output voltage and outputting the first output voltage from the voltage output end to the second rechargeable battery;

the logic control circuit is electrically connected with the voltage input end, the voltage output end, the voltage boosting circuit and the voltage reducing circuit, and is used for comparing the voltage of the first output end of the voltage input end with the driving voltage of the voltage output, and outputting a control signal according to the obtained comparison result to select the voltage boosting circuit to boost the first output voltage or select the voltage reducing circuit to reduce the first output voltage.

16. The charging system of claim 15, wherein the control signal comprises a first control signal and a second control signal;

when the driving voltage is smaller than the first output voltage, outputting the first control signal to the voltage reduction circuit to control the voltage reduction circuit to perform voltage boosting processing;

when the driving voltage is larger than the first output voltage, outputting the second control signal to the voltage boosting circuit to control the voltage boosting circuit to perform voltage boosting processing.

17. The charging system of claim 15, wherein the control signal comprises a first control signal and a second control signal;

when the driving voltage is smaller than the first output voltage, the logic control circuit outputs the first control signal to the voltage boosting circuit and the voltage reducing circuit, and the first control signal controls the voltage boosting circuit to stop working and controls the voltage reducing circuit to perform voltage boosting processing;

when the driving voltage is larger than the first output voltage, the logic control circuit outputs the second control signal to the voltage boosting circuit and the voltage reducing circuit, and the second control signal controls the voltage reducing circuit to stop working and controls the voltage boosting circuit to perform voltage boosting processing.

18. The charging system of claim 17, wherein the control signal further comprises a third control signal, and wherein the third control signal controls the step-up circuit and the step-down circuit to stop operating when the bluetooth headset is not electrically connected to the charging box to perform charging.

19. The charging system of claim 18, wherein the first control signal, the second control signal, and the third control signal are digital logic signals and are different from one another.

20. The charging system of claim 15, wherein the path management circuit is electrically connected to the logic control circuit, the voltage output terminal, and the second rechargeable battery,

21. The charging system according to claim 20, wherein when the driving voltage output from the second rechargeable battery is greater than the threshold voltage, the path management circuit controls the second rechargeable battery to be electrically connected to the voltage output terminal, the step-up circuit or the step-down circuit provides the processed first output voltage to the second rechargeable battery for charging, and the second rechargeable battery outputs the driving voltage to the operation circuit.

22. The charging system of claim 21, wherein the first switching voltage controls the transistor to be fully turned on when the driving voltage is greater than a threshold voltage, the second rechargeable battery is electrically turned on with the voltage output terminal, the first output voltage after the step-up or step-down is transmitted to the second rechargeable battery through the transistor, and the driving voltage output from the second rechargeable battery is transmitted to the operating circuit through the transistor.

23. The charging system of claim 22, wherein the path management circuit further comprises a detection circuit electrically connected to the second rechargeable battery for detecting a driving voltage and a charging current of the second rechargeable battery, and the logic control circuit adjusts a magnitude of a first switching voltage in real time according to the charging current obtained by the detection, wherein the first switching voltage is used for controlling a conduction degree of the transistor and the magnitude of the charging current.

24. The charging system according to any one of claims 14-23, wherein the charging system comprises two bluetooth headsets, and the charging box comprises two adjustment control circuits, one for each of the adjustment control circuits.

25. A charging system according to any of claims 14-23, characterized in that the charging system comprises two bluetooth headsets, each provided with the adjustment control circuit, respectively.