CN112242724A - Charging box for charging device and wireless earphone - Google Patents
Charging box for charging device and wireless earphone Download PDFInfo
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- CN112242724A CN112242724A CN201910645114.4A CN201910645114A CN112242724A CN 112242724 A CN112242724 A CN 112242724A CN 201910645114 A CN201910645114 A CN 201910645114A CN 112242724 A CN112242724 A CN 112242724A
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- battery
- charging
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1025—Accumulators or arrangements for charging
Abstract
Embodiments of the present disclosure relate to a charging case for a wireless headset and a device for charging. The apparatus for charging includes: the charging input port is used for receiving power supply of an external power supply; a first battery for storing electric energy from one of the charging input port and a second battery of the object to be charged; a detection circuit for detecting at least one of a voltage and a current of the first battery and the second battery; and a charging control unit connected to the detection circuit and the charging circuit for determining an operation mode of the charging circuit based on at least one of the voltage and the current detected by the detection circuit so as to control the charging circuit to charge at least one of the first battery and the second battery, the charging circuit being included in the apparatus. The embodiment of the disclosure can improve the energy utilization rate in the charging process.
Description
Technical Field
The present disclosure relates generally to power supply, and in particular, to an apparatus for charging and a charging box for a wireless headset.
Background
Conventional devices for charging (such as, without limitation, a charging box for a wireless headset) are, for example: the rechargeable battery configured by the charging device is charged to a preset value by using an external power supply, and then the battery with the voltage of the preset value is subjected to voltage reduction and then provides electric energy to the charging object, so that the electric energy is stored in the battery of the charged object.
In the conventional apparatus for charging, since the electric energy of the battery needs to be converted twice to be finally supplied to the battery configured by the object to be charged, there is necessarily an energy loss at each conversion. For example, after the voltage is increased to a predetermined value (for example, 5V) from the battery in the charging box of the wireless headset, for example, there is an energy loss of about 20%, and the 5V electric energy output from the battery in the charging box is reduced to charge the internal battery of the headset, for example, there is an energy loss of about 25%. Therefore, the energy utilization rate of the charging box for charging the built-in battery of the wireless earphone is as follows: 80%. 75%. 60%, in other words, approximately 40% of the energy is wasted during the charging of the wireless headset by the charging box.
Therefore, in the conventional apparatus for charging, the energy utilization rate during charging is low.
Disclosure of Invention
The present disclosure provides a device for charging, can promote the energy utilization in the charging process.
According to a first aspect of the present disclosure, an apparatus for charging is provided. The device includes: the charging input port is used for receiving power supply of an external power supply; a first battery for storing electric energy from one of the charging input port and a second battery of the object to be charged; a detection circuit for detecting at least one of a voltage and a current of the first battery and the second battery; and a charging control unit connected to the detection circuit and the charging circuit for determining an operation mode of the charging circuit based on at least one of the voltage and the current detected by the detection circuit so as to control the charging circuit to charge at least one of the first battery and the second battery, the charging circuit being included in the apparatus.
According to a second aspect of the present disclosure, there is provided a charging box for a wireless headset. This charging box includes: a charging unit for charging one or more wireless headsets, the charging unit being configured as the apparatus of the first aspect, the wireless headsets comprising a battery.
In some embodiments, the apparatus further comprises a power output interface for providing power to a powered object, the powered object being different from the charged object. In some embodiments, the charging circuit comprises: a path management unit connected to the charging input port, the first battery, and the power supply output interface, the path management unit configured to: determining whether the charging input port has power supply input of an external power supply; in response to determining that the charging input port has a power input of an external power source, supplying power from the charging input port to the power output port; and in response to determining that the charging port has no power input from the external power source, supplying power to the power output interface by the first battery.
In some embodiments, the charging circuit further comprises: and the first boost-buck circuit is connected with the charging control unit, the first battery and the second battery and is used for controlling the charging between the first battery and the second battery in one of a boost mode and a buck mode based on the working mode determined by the charging control unit.
In some embodiments, the object to be charged further includes a third battery, the detection circuit is further configured to detect at least one of a voltage and a current of the third battery, and the charging circuit further includes a second step-up/step-down circuit connected to the charging control unit, the first battery, and the third battery, the second step-up/step-down circuit being configured to control charging between the first battery and the third battery in one of a step-up mode and a step-down mode based on the operation mode determined by the charging control unit.
In some embodiments, the detection circuit comprises: a first voltage sampling circuit for detecting a voltage of the first battery; a second voltage sampling circuit for detecting a voltage of the second battery; and a third voltage sampling circuit for detecting a voltage of the third battery.
In some embodiments, the detection circuit further comprises a current sampling circuit comprising: an amplifying circuit for amplifying a current flowing through a sampling resistor, the sampling resistor being included in the detection circuit; and a filter circuit for filtering the amplified signal.
In some embodiments, the operating modes include: a first operating mode for controlling the first buck-boost circuit and a second operating mode for controlling the second buck-boost circuit.
In some embodiments, the charging control unit is configured to: determining that the first operating mode is a buck mode in response to determining that the detected voltage of the first battery is higher than the voltage of the second battery; and determining that the second operation mode is the step-down mode in response to determining that the detected voltage of the first battery is higher than the voltage of the third battery.
In some embodiments, the charging control unit is configured to: determining that the first operating mode is a boost mode in response to determining that the detected voltage of the first battery is lower than the voltage of the second battery; and determining that the second operation mode is the boost mode in response to determining that the detected voltage of the first battery is lower than the voltage of the third battery.
In some embodiments, the charging control unit is configured to: determining a charged battery, wherein the charged battery is one of a first battery, a second battery and a third battery; and determining a charging current for charging the battery to be charged based on the detected voltage of the battery to be charged.
In some embodiments, wherein determining the charging current to charge the charged battery comprises: in response to determining that the voltage of the charged battery is below a first predetermined value, determining that a charging current for charging the charged battery is a first current; in response to determining that the voltage of the charged battery is higher than the first predetermined value and lower than the second predetermined value, determining the charging current to charge the charged battery to be the second current.
In some embodiments, the charging control unit is further configured to: in response to determining that the voltage of the charged battery meets the predetermined condition, it is determined that the charging voltage to charge the charged battery is constant at the first voltage. In response to determining that the voltage of the charged battery is below the predetermined current threshold, stopping charging the charged battery.
In some embodiments, the first buck-boost circuit comprises: a plurality of switching tubes for being closed or opened in response to an output of the charging control unit; the first capacitor is connected in parallel at two ends of the first battery and used for filtering; the second capacitor is connected in parallel with two ends of the second battery and used for filtering; and the inductor is connected with the first capacitor and the second capacitor in series through at least one of the plurality of switching tubes and is used for stabilizing voltage.
In some embodiments, the plurality of switching tubes comprises: the first end of the first switch tube is connected with the first end of the first capacitor, and the second end of the first switch tube is connected with the first end of the inductor; a first end of the first switch tube is connected with a first end of the inductor, and a second end of the first switch tube is connected with a first end of the first capacitor; the first end of the third switching tube is connected with the first end of the inductor, and the second end of the third switching tube is connected with the second end of the first capacitor; and a first end of the fourth switching tube is connected with the second end of the inductor, and a second end of the fourth switching tube is connected with the second end of the second capacitor.
In some embodiments, determining the operating mode of the charging circuit comprises: keeping the first switching tube closed and the third switching tube open so that the first buck-boost circuit works in a boost mode; and controlling the on-off of the second switching tube and the fourth switching tube so as to boost the output electric energy to the second battery through the inductor. This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the disclosure, nor is it intended to be used to limit the scope of the disclosure.
Drawings
Fig. 1 shows a schematic diagram of an apparatus 100 for charging according to an embodiment of the present disclosure;
fig. 2 shows a circuit diagram of a detection circuit and a buck-boost circuit 200 according to an embodiment of the present disclosure;
fig. 3 shows a circuit diagram of a current sampling circuit 300 according to an embodiment of the present disclosure;
like or corresponding reference characters designate like or corresponding parts throughout the several views.
Detailed Description
Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the drawings represent the preferred embodiments of the present disclosure, it should be understood that the structures and devices illustrated in the drawings are not necessarily drawn to scale. In addition, the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The term "include" and variations thereof as used herein is meant to be inclusive in an open-ended manner, i.e., "including but not limited to". Unless specifically stated otherwise, the term "or" means "and/or". The term "based on" means "based at least in part on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first," "second," and the like may refer to different or the same object. Other explicit and implicit definitions are also possible below.
As described above, in the conventional apparatus for charging, since the electric power of the battery needs to be converted twice to be finally supplied to the battery configured by the charging object, there is necessarily an energy loss at each conversion. Therefore, nearly 40% of the energy is wasted during charging of the headset in the charging box.
To address, at least in part, one or more of the above problems and other potential problems, example embodiments of the present disclosure propose an apparatus for charging. The device includes: the charging input port is used for receiving power supply of an external power supply; a first battery for storing electrical energy from one of the charging input port and the second battery; a detection circuit for detecting at least one of a voltage and a current of a first battery and a second battery of a charged object; and a charging control unit connected to the detection circuit and the charging circuit for determining an operation mode of the charging circuit based on at least one of the voltage and the current detected by the detection circuit so as to control the charging circuit to charge at least one of the first battery and the second battery, the charging circuit being included in the apparatus.
In the above-described aspect, the operating mode of the charging circuit is determined by the charging control unit based on the voltages or currents of the first battery and the second battery detected by the detection circuit, so as to control the charging circuit to charge at least one of the first battery and the second battery; the battery in the charging device can be directly boosted or reduced in voltage to charge the battery in the charging object, the number of times of energy transfer between the charging device and the battery of the object to be charged is reduced, and the voltage difference in the boosting or reducing process is further reduced. Therefore, the loss of energy transfer in the charging process can be effectively reduced.
Fig. 1 shows a schematic diagram for a charging system 100 according to an embodiment of the disclosure. As shown in fig. 1, the system 100 includes a charging device 112 and a charged object 184. The charging device 112 includes: the charging input port 110, the charging circuit 120, the charging control unit 130, the detection circuit 140, and the first battery 170. The charged object 184 includes the second battery 180. In some embodiments, the charging device 112 also includes a communication port 160. The charging input port 110 is used for receiving an external power supply. The first battery 170 is used to store electrical energy from the charging input port 110 or to store electrical energy from the second battery 180. The detection circuit 140 is configured to detect at least one of a voltage and a current of the first battery 170 and the second battery 180. The charging control unit 130 is connected to the detection circuit 140 and the charging circuit, and is configured to determine an operation mode of the charging circuit 120 based on at least one of the voltage and the current detected by the detection circuit 140, so as to control the charging of at least one of the first battery 170 and the second battery 180 by the charging circuit 120. In some embodiments, the object 184 further comprises a third battery, and the detection circuit is further configured to detect at least one of a voltage and a current of the third battery. In some embodiments, the system 100 may also include a power output interface 150 and a powered object 186. The power supply output interface 150 is used to supply power to the powered object 186. In some embodiments, the charging device 112 is, for example, a charging box of a wireless headset, the object 184 to be charged is, for example, one or more wireless headsets, and the object 186 to be powered is different from the object 184 to be charged, and is, for example, a display screen, which may also be other external circuits or devices that need to be powered.
In the above solution, the charging control unit 130 determines the operation mode of the charging circuit 120 based on the voltage and/or current detection values of the first battery 170 and the second battery 180 detected by the detection circuit 140, so as to control the charging circuit 120 to charge at least one of the first battery 170 and the second battery 180, and the first battery 170 in the charging device 112 can directly charge the second battery 180 in the charging object through the determined operation mode (voltage boosting or voltage reducing), thereby reducing the number of energy transfers between the charging device 112 and the battery of the object 184 to be charged, and further effectively reducing the energy transfer loss during the charging process.
With respect to the charging circuit 120, in some embodiments, it includes a path management unit 122, a first boost circuit 124, and a second boost circuit 126.
Regarding the path management unit 122, in some embodiments, it is connected to the charging input port 110, the first battery 170, and the power supply output interface 150. The path management unit 122 is configured to: determining whether the charging input port 110 has a power input of an external power source; in response to determining that the charging input port 110 has a power input from an external power source, supplying power from the charging input port 110 to the power output interface 150; and in response to determining that the charging port has no power input from the external power source, supplying power to the power output interface 150 by the first battery.
With respect to buck-boost circuits, in some embodiments, system 100 is configured with two buck-boost circuits, namely a first buck-boost circuit 124 and a second buck-boost circuit 126.
With respect to the first buck-boost circuit 124, in some embodiments, it is coupled to the charge control unit 130, the first battery 170, and the second battery 180 for charging one of the first battery 170 and the second battery 180 based on the operating mode determined by the charge control unit 130.
Regarding the second buck-boost circuit 126, which in some embodiments is connected to the charge control unit 130, the first battery 170 and the third battery 182, the second buck-boost circuit 126 is configured to control charging between the first battery 170 and the third battery 182 in one of a boost mode and a buck mode based on the operating mode determined by the charge control unit 130.
In the above-described aspect, each of the step-up/step-down circuits can operate in the step-up state, the step-down state, and the constant current output state by the operation mode determined based on the charge control unit 130. And each of the step-up/down voltage circuits may select any one of the connected both-end batteries as a charging input and the other battery as a charging output based on the output of the charging control unit 130. By adopting the above-described means, that is, switching the battery serving as the charging input and the battery serving as the charging output based on the output of the charging control unit 130 by the step-up/step-down circuit, the bidirectional charging function between the first battery 170 and the second battery 180 or the third battery 182 in the object 184 to be charged in the system 100 is realized. Wherein the battery serving as the charging input and the battery serving as the charging output are controlled by the charging control unit 130.
With respect to the detection circuit 120, in some embodiments, it includes three detection circuits, namely a first detection circuit 142, a second detection circuit 144, and a third detection circuit 146. The first detection circuit 142 is used to detect at least one of a voltage and a current of the first battery 170. The second detection circuit 144 is for detecting at least one of a voltage and a current of the second battery 180. The third detection circuit 146 is configured to detect at least one of a voltage and a current of the third battery 182. In some embodiments, each of the first detection circuit 142, the second detection circuit 144, and the third detection circuit 146 includes, for example: a voltage sampling circuit and a current sampling circuit. The voltage sampling circuit is used for respectively detecting the voltages of the first battery 170, the second battery 180 and the third battery 182; the current sampling circuit is used to detect the charging or discharging currents of the first battery 170, the second battery 180, and the third battery 182, respectively.
In some embodiments, each current sampling circuit includes, for example, an amplifying circuit for amplifying a current flowing through a sampling resistor included in the detection circuit; and a filter circuit for filtering the amplified signal. In some embodiments, a high-precision sampling resistor with a small resistance value and capable of flowing enough current is connected in series with the anode of the detected battery, then the voltage across the sampling resistor is amplified and input to the charging control unit 130, the magnitude of the current flowing into or out of the detected battery is calculated based on the collection of the voltage across the sampling resistor, and the charging current of the detected battery is adjusted in real time according to the magnitude of the current, so as to keep the current of the detected battery stable during charging.
As for the charging control unit 130, it is configured to determine an operation mode of the charging circuit 120 based on at least one of the voltage and the current detected by the detection circuit 140, so as to control charging of at least one of the first battery 170 and the second battery 180 by the charging circuit 120. In some embodiments, the operating modes include: a first operating mode for controlling the first buck-boost circuit and a second operating mode for controlling the second buck-boost circuit. In some embodiments, the charging control Unit 130 is, for example, a Micro Controller Unit (MCU).
In some embodiments, the charging control unit 130 is further configured to: in response to determining that the detected voltage of the first battery 170 is higher than the detected voltage of the second battery 180, determining that the first operation mode is the step-down mode; and responsive to determining that the detected voltage of the first battery 170 is higher than the detected voltage of the third battery 182, determining that the second operating mode is the buck mode. In some embodiments, the charge control unit 130 is further configured for determining the first operating mode to be a boost mode in response to determining that the detected voltage of the first battery 170 is lower than the detected voltage of the second battery 180; and determining that the second operating mode is the boost mode in response to determining that the detected voltage of the first battery 170 is lower than the detected voltage of the third battery 182. For example, when the first battery 170 charges the second battery 180 and the third battery 182, if the voltage of the first battery 170 is higher than the voltages of the second battery 180 and the third battery 182, the first buck-boost circuit and the second buck-boost circuit both operate in the buck mode, and charge the second battery 180 and the third battery 182 by dropping the voltage. If the voltage of the first battery 170 is higher than the voltage of only one of the batteries (e.g., the second battery 180), the first battery 170 charges the battery (e.g., the second battery 180) with the voltage lower than the voltage of the first battery through the voltage reduction circuit, and the first battery 170 charges the other battery (e.g., the second battery 182) through the voltage boost circuit. If the voltage of the first battery 170 is lower than the voltages of the other two batteries, the first boost-buck circuit and the second boost-buck circuit charge the second battery 180 and the third battery 182 in a boost manner.
In some embodiments, the charging control unit 130 is further configured to control the output voltage and the output current of the charging circuit. For example, in the charging state, the charging control unit 130 controls the output voltage and current of the charging circuit to the battery to be charged according to the voltage of the battery to be charged based on the currents and voltages of the first battery, the second battery, and the third battery detected in real time. For example, the charging control unit 130 is configured to: determining a charged battery, wherein the charged battery is one of a first battery, a second battery and a third battery; and determining a charging current for charging the battery to be charged based on the detected voltage of the battery to be charged.
The above-described manner of determining the charging current for charging the battery to be charged may be various. In some embodiments, in response to determining that the detected voltage of the charged battery (e.g., the second charged battery 180) is lower than a first predetermined value (e.g., 3.0V), the charge control unit 130 determines that the charging current for charging the charged battery is the first current, e.g., charging at 0.1 times the capacity of the charged battery, i.e., charging at 0.1C of the charging current. In response to determining that the voltage of the charged battery (e.g., the second charged battery 180) is higher than a first predetermined value (e.g., 3.0V) and lower than a second predetermined value (e.g., 4.2V), the charging control unit 130 then determines that the charging current for charging the charged battery is the second current, for example, charging at 0.5 times or 1 times the preset charging current. In some embodiments, the charging control unit 130 is configured to determine that the charging voltage for charging the battery to be charged is constant at the first voltage (e.g., the charging voltage is constant at 4.2V) in response to determining that the voltage of the battery to be charged meets a predetermined condition (e.g., is close to 4.2V). Charging of the charged battery is stopped in response to determining that the voltage of the charged battery is below a predetermined threshold of current (e.g., 0.1 times the maximum charge rate).
The above working logic of the charging control unit 130 can be solidified inside the chip through pre-programmed burning. The charging control unit 130 may also receive control signals via the communication port 180 to control other units of the system 100. For example, if the charge control unit 130 receives an instruction via the communication port to charge the first battery 170 by the second battery 180, the charge control unit 130 outputs the operation mode of the charging circuit 120, and controls the charging circuit 120 so that the second battery 180 charges the first battery 170.
With respect to the communication port 180, in some embodiments, it is connected to or interacts with the charging control unit 130. For example, through the communication port 180, the user may set a charging mode to the charging control unit 130, for example, may control any battery of the first battery 170, the second battery 180, and the third battery 182 to charge the remaining batteries; or sets a charge start condition or a charge end condition. For example, if it is determined that the voltage of second battery 180 or third battery 182 is below a predetermined charge threshold (e.g., 3.5V), then charging of second battery 180 or third battery 182 is initiated. Or if it is determined that the voltage of the second battery 180 or the third battery 182 is higher than the voltage of the first battery 170, the charging of the second battery 180 or the third battery 182 is stopped. The predetermined charging threshold, the charging start condition, or the charging end condition may be set by a user and transmitted to the charging control unit 130 via the communication port 180, thereby realizing flexible allocation of the set electric quantity of each battery.
With respect to the object 184 being charged, in some embodiments, it is, for example, one or more wireless headsets including a battery. The charging box of the wireless headset includes, for example: a charging unit for charging one or more wireless headsets, the charging unit being configured, for example, as the apparatus for charging described above. By adopting the above means, the number of times of energy transfer between the charging box battery and the earphone battery is reduced, the voltage difference in the boosting or reducing process is reduced, the charging box battery directly boosts or reduces the voltage to charge the earphone battery, and the loss in the energy transfer process can be effectively reduced. The energy utilization rate can be improved to more than 90% from about 60%. In some embodiments, the charging box can directly collect the voltage of the earphone battery through the detection circuit, so that the voltage of the earphone battery can be simply and conveniently judged in the charging state. A charging circuit is reduced in the circuit of the earphone, and design cost is effectively saved.
In some embodiments, a wireless headset, for example, comprises: a processor, a speaker, a communication module, a microphone, an antenna, a touch screen (or display screen), a battery, a charge management module, a charge input, etc. The system 100 for charging is, for example, a charging box of a wireless headset. In some embodiments, the wireless headsets are, for example, two TWS (TrueWireless Stereo) headsets that can be used separately and in concert, each without any external wire connection, so that the user is not caught by the wire while listening to a phone call or listening to music, thereby making use more convenient. Each TWS headset includes, for example, a rechargeable battery (e.g., the second battery 180 or the third battery 182). In some embodiments, the wireless headset and the battery of the charging box may be charged to each other. For example, power from a battery (e.g., first battery 170) of the charging box may be charged by a battery in the wireless headset via a charging circuit; the power of the rechargeable battery (e.g., the second battery 180 or the third battery 182) in the headset may be charged to the battery (e.g., the first battery 180) in the charging box via the charging circuit controlled by the charging control unit 130. The following will describe the charging control process of the first battery 170 in the charging apparatus 112 and the second battery 180 or the third battery 184 in the object 184 to be charged in the related description of fig. 2. And will not be described in detail herein.
A charging circuit and a charging control process according to an embodiment of the present disclosure will be described below with reference to fig. 2. Fig. 2 shows a circuit diagram of a detection circuit and a buck-boost circuit 200 according to an embodiment of the present disclosure. As shown in fig. 2, the detection circuit and the buck-boost circuit 200 are connected to a first battery 210, a second battery 220, and a third battery 230. The detection circuit and buck-boost circuit 200 includes a first voltage sampling circuit 240, a second voltage sampling circuit 242, a third voltage sampling circuit 244, a first buck-boost circuit 250, and a second buck-boost circuit 252. The second battery 220 and the third battery 230 are included in the charged object.
The first voltage sampling circuit 240 is used for detecting or sampling the voltage of the first battery 210. In some embodiments, the first sampling circuit includes a fifth resistor R5, a ninth resistor R9, a seventh resistor R7, and a third capacitor C3. After the voltage of the first battery 210 is divided by the fifth resistor R5 and the ninth resistor R9, the voltage is filtered by an RC circuit formed by the seventh resistor R7 and the third capacitor C3, and then the detected voltage of the first battery 210 is provided to the charging control unit through the acquisition terminal Bat1_ SMP. In some embodiments, the resistance of the seventh resistor R7 is, for example, 1K, the resistance of the fifth resistor R5 and the ninth resistor R9 is, for example, 20K, and the capacitance of the third capacitor C3 is, for example, 100 nF. The first resistor R1 is, for example, 0.1 Ω
The second voltage sampling circuit 242 is used to detect or sample the voltage of the second battery 220. In some embodiments, the second sampling circuit includes a sixth resistor R6, a tenth resistor R10, an eighth resistor R8, and a fourth capacitor C4. After the voltage of the second battery 220 is divided by the sixth resistor R6 and the tenth resistor R10, the voltage is filtered by an RC circuit formed by the eighth resistor R8 and the fourth capacitor C4, and then the detected voltage of the second battery 220 is provided to the charging control unit through the acquisition terminal Bat2_ SMP. In some embodiments, the resistance of the eighth resistor R8 is, for example, 1K, the resistance of the sixth resistor R6 and the tenth resistor R10 is, for example, 20K, and the capacitance of the fourth capacitor C4 is, for example, 100 nF. The second resistor R2 is, for example, 0.1 Ω.
The third voltage sampling circuit 244 is used to detect or sample the voltage of the third battery 230. In some embodiments, the third sampling circuit includes an eighteenth resistor R18, a twenty-second resistor R22, a twentieth resistor R20, and an eighth capacitor C8. After the voltage of the third battery 230 is divided by the eighteenth resistor R18 and the twenty-second resistor R22, the voltage is filtered by an RC circuit formed by the twentieth resistor R20 and the eighth capacitor C8, and then the collected voltage of the third battery 230 is provided to the charging control unit through the collection terminal Bat3_ SMP. In some embodiments, the twentieth resistor R20 has a resistance of, for example, 1K, the eighteenth resistor R18 and the twenty-second resistor R22 have a resistance of, for example, 20K, and the eighth capacitor C8 has a capacitance of, for example, 100 nF. The fourteenth resistor R14 is, for example, 0.1 Ω.
Through making each way voltage sampling circuit through the partial pressure of series resistance, then provide the collection voltage for the control unit that charges after RC filters, this disclosed embodiment can provide a stable voltage of being gathered or being surveyed for the control unit that charges, and then improves the degree of accuracy that battery voltage detected.
The charging device includes two buck-boost circuits, namely a first buck-boost circuit 250 and a second buck-boost circuit 252. The first boost-buck circuit 250 is connected to the charge control unit, the first battery charge 210 and the second battery 220, and is configured to control the charge between the first battery 210 and the second battery 220 in one of a boost mode and a buck mode based on an operation mode (i.e., a first operation mode) determined by the charge control unit. The second step-up/step-down circuit 252 is connected to the charge control unit, the first battery 210, and the third battery 220, for controlling the charge between the first battery 210 and the third battery 230 in one of the step-up mode and the step-down mode based on the operation mode (i.e., the second operation mode) determined by the charge control unit. The following description will be made of an operation principle of charging and discharging a battery to be charged by a charging device, taking as an example charging of the first battery 210 to the second battery 220.
A first buck-boost circuit 250, which in some embodiments includes a plurality of switching tubes for closing or opening in response to an output of the charge control unit; the first capacitor is connected in parallel at two ends of the first battery and used for filtering; the second capacitor is connected in parallel with two ends of the second battery and used for filtering; and the inductor is connected with the first capacitor and the second capacitor in series through at least one of the plurality of switching tubes and used for stabilizing voltage. In some embodiments, the first buck-boost circuit 250 includes, for example: the circuit comprises a first switch tube Q1, a second switch tube Q2, a third switch tube Q3, a fourth switch tube Q4, a first inductor L1, a first capacitor C1 and a second capacitor C2. A first terminal of the first switch Q1 is connected to a first terminal of the first capacitor C1, and a second terminal of the first switch Q1 is connected to a first terminal of the first inductor L1. A first terminal of the second switch Q2 is connected to the second terminal of the first inductor L1, and a second terminal of the second switch Q2 is connected to the first terminal of the second capacitor C2. A first terminal of the third transistor Q3 is connected to a first terminal of the first inductor L1, and a second terminal of the third transistor Q3 is connected to a second terminal of the first capacitor C1. A first terminal of the fourth switching transistor Q4 is connected to the second terminal of the first inductor L1, and a second terminal of the fourth switching transistor Q4 is connected to the second terminal of the second capacitor C2. The first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4 are used for being closed or opened in response to the output of the charging control unit. The first inductor L1, the first capacitor C1 and the second capacitor C2 are used for LC filtering and voltage stabilization during voltage boosting or voltage dropping. In some embodiments, the first capacitance C1 and the second capacitance C2 are, for example, 10 uF.
Regarding the switching tubes, in some embodiments, the first switching tube Q1 and the second switching tube Q2 are P-MOS tubes, for example, and the third switching tube Q3 and the fourth switching tube Q4 are N-MOS tubes, for example. In some embodiments, the control terminal PWM _ a1 of the first switching transistor Q1, the control terminal PWM _ D1 of the second switching transistor Q2, the control terminal PWM _ B1 of the third switching transistor Q3, and the control terminal PWM _ C1 of the fourth switching transistor Q4 of the first buck-boost circuit 250 are controlled by the output of the charging control unit, for example. In some embodiments, a third resistor R3 is connected between the control terminal PWM _ a1 of the first switch Q1 and the first terminal of the first capacitor C1, a fourth resistor R4 is connected between the control terminal PWM _ D1 of the second switch Q2 and the first terminal of the second capacitor C2, an eleventh resistor R11 is connected between the control terminal PWM _ B1 of the third switch Q3 and the second terminal of the first capacitor C1, and a twelfth resistor R12 is connected between the control terminal PWM _ C1 of the fourth switch Q4 and the second terminal of the second capacitor C1.
In some embodiments, the second buck-boost circuit 252 includes, for example: a fifth switch tube Q5, a sixth switch tube Q6, a seventh switch tube Q7, an eighth switch tube Q8, a second inductor L2, a fifth capacitor C5 and a sixth capacitor C6. A first terminal of the fifth switch Q5 is connected to a first terminal of the fifth capacitor C5, and a second terminal of the fifth switch Q5 is connected to a first terminal of the second inductor L2. A first terminal of a sixth switch Q6 is connected to the second terminal of the second inductor L2, and a second terminal of the sixth switch Q6 is connected to the first terminal of a sixth capacitor C6. A first terminal of the seventh switch Q7 is connected to the first terminal of the second inductor L2, and a second terminal of the seventh switch Q7 is connected to the second terminal of the fifth capacitor C1. A first terminal of the eighth switch Q8 is connected to the second terminal of the second inductor L2, and a second terminal of the eighth switch Q8 is connected to the second terminal of the sixth capacitor C6. The fifth switch tube Q5, the sixth switch tube Q6, the seventh switch tube Q7 and the eighth switch tube Q8 are used for being closed or opened in response to the output of the charging control unit. The second inductor L2, the fifth capacitor C1 and the sixth capacitor C6 are used for LC filtering and voltage stabilization during voltage boosting or voltage dropping. In some embodiments, the fifth switch Q5 and the sixth switch Q6 are P-MOS transistors, for example, and the seventh switch Q7 and the eighth switch Q8 are N-MOS transistors, for example. In some embodiments, the control terminal PWM _ a2 of the fifth switch tube Q5, the control terminal PWM _ D2 of the sixth switch tube Q6, the control terminal PWM _ B2 of the seventh switch tube Q7 and the control terminal PWM _ C2 of the eighth switch tube Q8 of the second buck-boost circuit 252 are controlled by the output of the charging control unit, for example, so as to control the on and off of the switch tubes. In some embodiments, the fifth capacitance C5 and the sixth capacitance C6 are, for example, 10 uF. In some embodiments, the control terminal PWM _ a2 of the fifth switch tube Q5, the control terminal PWM _ D2 of the sixth switch tube Q6, the control terminal PWM _ B2 of the seventh switch tube Q7 and the control terminal PWM _ C2 of the eighth switch tube Q8 of the second buck-boost circuit 252 are controlled by the output of the charging control unit, for example, so as to control the on and off of the switch tubes. In some embodiments, a fifteenth resistor R15 is connected between the control terminal PWM _ a2 of the fifth switching tube Q5 and the first terminal of the fifth capacitor C5, a sixteenth resistor R16 is connected between the control terminal PWM _ D2 of the sixth switching tube Q6 and the first terminal of the sixth capacitor C6, a twenty-third resistor R23 is connected between the control terminal PWM _ B2 of the seventh switching tube Q7 and the second terminal of the fifth capacitor C5, and a twenty-fourth resistor R24 is connected between the control terminal PWM _ C2 of the eighth switching tube Q8 and the second terminal of the sixth capacitor C6.
When the charging control unit determines that the voltage of the first battery 210 detected by the first voltage sampling circuit 240 is lower than the voltage of the second battery 220 detected by the second voltage sampling circuit 242, for example, the collecting voltage of the first battery 210 provided to the charging control unit by the collecting terminal Bat1_ SMP is lower than the collecting voltage of the first battery 210 provided to the charging control unit by the collecting terminal Bat2_ SMP, the charging control unit determines that the first operating mode of the buck-boost circuit in the charging circuit is the boost mode.
When the operation mode of the first buck-boost circuit 250 is set to the boost mode, i.e. the first buck-boost circuit 250 is switched to the boost circuit, the first switch Q1 remains closed, and the third switch Q3 remains open, so that the first buck-boost circuit 250 operates in the boost mode; and controlling the on-off of the second switch tube Q2 and the fourth switch tube Q4, so that the electric energy is boosted through the first inductor L1 and output to the second battery 220, and the conversion function of the electric energy is realized by controlling the on-off of the second switch tube Q2 and the fourth switch tube Q4. For example, when the fourth switching transistor Q4 is closed and the second switching transistor Q2 is simultaneously opened, the current of the first battery 210 flows from the positive electrode to the fourth switching transistor Q4 through the first inductor L1 and then flows back to the negative electrode of the first battery. When the magnetic flux of the first inductor L1 reaches saturation, the fourth switching tube Q4 is opened, the second switching tube Q2 is closed, and since the current flowing through the first inductor L1 cannot suddenly change, the current flows from the first inductor L1 to the second switching tube Q2 and is output. When the magnetic flux of the first inductor L1 is weak, the second switching tube Q2 is opened, the fourth switching tube Q4 is closed, the first step is repeated, that is, the current of the first battery 210 flows from the positive electrode to the fourth switching tube Q4 through the first inductor L1, then flows back to the negative electrode of the first battery, and then the above steps are sequentially repeated. As above, the on-off time of the second switching tube Q2 and the fourth switching tube Q4 is adjusted to adjust the output voltage, so as to achieve the function of boosting output.
When the charging control unit determines that the voltage of the first battery 210 detected by the first voltage sampling circuit 240 is higher than the voltage of the second battery 220 detected by the second voltage sampling circuit 242, for example, the collecting voltage of the first battery 210 provided to the charging control unit by the collecting terminal Bat1_ SMP is higher than the collecting voltage of the first battery 210 provided to the charging control unit by the collecting terminal Bat2_ SMP, the charging control unit determines that the first operating mode of the first buck-boost circuit 250 in the charging circuit is the buck mode. When the operation mode of the first buck-boost circuit 250 is set to the buck mode, i.e. the first buck-boost circuit 250 is switched to the buck mode, the fourth switch Q4 is kept open, the second switch Q2 is kept closed, and the buck function is achieved by controlling the on-off time of the first switch Q1 and the third switch Q3 in a similar manner. When the first buck-boost circuit 250 operates in the buck mode, the output voltage thereof also depends on the duty ratio of the on/off of the first switching tube Q1 and the third switching tube Q3.
The control of charging the second battery 220 by the first battery 210 is described above. Due to the symmetrical structure of the buck-boost circuit, the charging from the second battery 220 to the first battery 210 can be realized by the opposite control method.
A current sampling circuit according to an embodiment of the present disclosure will be described below with reference to fig. 3. Fig. 3 shows a circuit diagram of a current sampling circuit 300 according to an embodiment of the present disclosure. As shown in fig. 3, the current sampling circuit 300 is used to detect the current of the first battery. The current sampling circuit 300 includes an amplifying circuit and a filtering circuit. The amplifying circuit is used for amplifying the voltage across the sampling resistor (i.e., the first resistor R1) (i.e., the voltage between C1_ Samp _ P and C1_ Samp _ N) shown in fig. 2. The filter circuit is used for filtering the amplified signal so as to stabilize the signal transmitted to the charging control unit.
In some embodiments, the amplification circuit comprises: a seventeenth resistor R17, a twenty-fifth resistor R25, a thirteenth resistor R13, a twenty-sixth resistor R26 and a first amplifying electrical appliance U1A. The resistance values of the seventeenth resistor R17 and the twenty fifth resistor R25 are equal; the thirteenth resistor R13 has the same resistance as the twenty-sixth resistor R26. The amplification factor of the collected voltage at two ends of the sampling resistor is the ratio of R26 to R25. In some embodiments, the specific amplification of the amplification circuit may be adjusted according to the actual circuit. In some embodiments, the filter circuit comprises: a nineteenth resistor R19, a ninth capacitor C9, a twenty-first resistor R21, a seventh capacitor C7 and a second amplifier U1B.
The current sampling circuit for detecting the second battery has a similar structure to the current sampling circuit 300 shown in fig. 3, and includes an amplifying circuit and a filter circuit. The amplifying circuit is configured to amplify a voltage (i.e., a voltage between C2_ Samp _ P and C2_ Samp _ N) across the sampling resistor (i.e., the second resistor R2) shown in fig. 2, and then filter the amplified signal through the filter circuit and send the filtered signal to the charge control unit.
The current sampling circuit for detecting the third battery has a similar structure to the current sampling circuit 300 shown in fig. 3, and includes an amplifying circuit and a filter circuit. The amplifying circuit is configured to amplify a voltage (i.e., a voltage between C3_ Samp _ P and C3_ Samp _ N) across the sampling resistor (i.e., the fourteenth resistor R14) shown in fig. 2, and then filter the amplified signal through the filter circuit and send the filtered signal to the charging control unit.
In the above scheme, since the current flowing through the first resistor R1 is small, the current flowing through the first resistor R1 is amplified by the amplifying circuit, and then the amplified signal is filtered and sent to the charging control unit.
Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
The above are only alternative embodiments of the present disclosure and are not intended to limit the present disclosure, which may be modified and varied by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (17)
1. An apparatus for charging, comprising:
the charging input port is used for receiving power supply of an external power supply;
a first battery for storing electric energy from one of the charging input port and a second battery of a charged object;
a detection circuit for detecting at least one of a voltage and a current of the first battery and the second battery; and
a charging control unit connected to the detection circuit and the charging circuit for determining an operation mode of the charging circuit based on at least one of the voltage and the current detected by the detection circuit so as to control charging of at least one of the first battery and the second battery by the charging circuit, the charging circuit being included in the apparatus.
2. The apparatus of claim 1, further comprising:
a power supply output interface for supplying power to a powered object, the powered object being different from the charged object.
3. The apparatus of claim 2, wherein the charging circuit comprises:
a path management unit connected to the charging input port, the first battery, and the power supply output interface, the path management unit configured to:
determining whether the charging input port has a power supply input of the external power supply;
in response to determining that the charging input port has a power input of the external power source, supplying power to the power output interface by the charging input port; and
in response to determining that the charging port does not have a power input of the external power source, providing power to the power output interface by the first battery.
4. The apparatus of claim 1, wherein the charging circuit further comprises:
and the first voltage-boosting circuit is connected with the charging control unit, the first battery and the second battery and is used for controlling the charging between the first battery and the second battery in one mode of a voltage-boosting mode and a voltage-reducing mode based on the working mode determined by the charging control unit.
5. The apparatus of claim 1, wherein the object to be charged further comprises a third battery, the detection circuit is further configured to detect at least one of a voltage and a current of the third battery, the charging circuit further comprises a second boost-buck circuit connected to the charging control unit, the first battery, and the third battery, the second boost-buck circuit is configured to control charging between the first battery and the third battery in one of a boost mode and a buck mode based on the operation mode determined by the charging control unit.
6. The apparatus of claim 5, wherein the detection circuit comprises:
a first voltage sampling circuit for detecting a voltage of the first battery;
a second voltage sampling circuit for detecting a voltage of the second battery; and
and the third voltage sampling circuit is used for detecting the voltage of the third battery.
7. The apparatus of claim 5, wherein the detection circuit further comprises a current sampling circuit comprising:
an amplifying circuit for amplifying a current flowing through a sampling resistor included in the detection circuit; and
and the filter circuit is used for filtering the amplified signals.
8. The apparatus of claim 6, wherein the operational mode comprises: a first operating mode for controlling the first buck-boost circuit and a second operating mode for controlling the second buck-boost circuit.
9. The apparatus of claim 8, wherein the charging control unit is configured to:
determining that the first operating mode is a buck mode in response to determining that the detected voltage of the first battery is higher than the voltage of the second battery; and
determining that the second operating mode is a buck mode in response to determining that the detected voltage of the first battery is higher than the voltage of the third battery.
10. The apparatus of claim 8, wherein the charging control unit is configured to:
determining that the first operating mode is a boost mode in response to determining that the detected voltage of the first battery is lower than the voltage of the second battery; and
determining that the second operating mode is a boost mode in response to determining that the detected voltage of the first battery is lower than the voltage of the third battery.
11. The apparatus of claim 5, wherein the charging control unit is configured to:
determining a charged battery, the charged battery being one of the first battery, the second battery, and the third battery; and
determining a charging current to charge the charged battery based on the detected voltage of the charged battery.
12. The apparatus of claim 11, wherein determining a charging current to charge the charged battery comprises:
determining a charging current to charge the charged battery to a first current in response to determining that the voltage of the charged battery is below a first predetermined value; and
determining a charging current to charge the charged battery to be a second current in response to determining that the voltage of the charged battery is above a first predetermined value and below a second predetermined value.
13. The apparatus of claim 12, wherein the charging control unit is configured to: :
determining that a charging voltage for charging the charged battery is constant at a first voltage in response to determining that the voltage of the charged battery meets a predetermined condition; and
in response to determining that the voltage of the charged battery is below a predetermined current threshold, stopping charging the charged battery.
14. The apparatus of claim 4, wherein the first buck-boost circuit comprises:
a plurality of switching tubes for being closed or opened in response to an output of the charging control unit;
the first capacitor is connected in parallel with two ends of the first battery and used for filtering;
the second capacitor is connected in parallel with two ends of the second battery and used for filtering; and
and the inductor is connected with the first capacitor and the second capacitor in series through at least one of the plurality of switching tubes and is used for stabilizing voltage.
15. The apparatus of claim 14, wherein the plurality of switching tubes comprises:
a first end of the first switch tube is connected with a first end of the first capacitor, and a second end of the first switch tube is connected with a first end of the inductor;
a first end of the second switch tube is connected with a second end of the inductor, and a second end of the second switch tube is connected with a first end of the second capacitor;
a first end of the third switching tube is connected with the first end of the inductor, and a second end of the third switching tube is connected with the second end of the first capacitor; and
and a first end of the fourth switching tube is connected with the second end of the inductor, and a second end of the fourth switching tube is connected with the second end of the second capacitor.
16. The apparatus of claim 15, wherein determining an operating mode of the charging circuit comprises:
keeping the first switch tube closed and the third switch tube open so that the first buck-boost circuit works in a boost mode; and
and controlling the on-off of the second switching tube and the fourth switching tube so as to boost the output electric energy to the second battery through the inductor.
17. A charging box for a wireless headset, comprising:
a charging unit for charging one or more wireless headsets, the charging unit being configured as an apparatus as claimed in any of claims 1-16, the wireless headsets comprising a battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910645114.4A CN112242724A (en) | 2019-07-17 | 2019-07-17 | Charging box for charging device and wireless earphone |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910645114.4A CN112242724A (en) | 2019-07-17 | 2019-07-17 | Charging box for charging device and wireless earphone |
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| CN209016767U (en) * | 2018-12-14 | 2019-06-21 | 歌尔科技有限公司 | Charging box and wireless headset charging system |
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| US20060035527A1 (en) * | 2004-08-11 | 2006-02-16 | Kabushiki Kaisha Toshiba | Information processing apparatus and method for controlling power supply of the apparatus |
| CN104868529A (en) * | 2015-04-30 | 2015-08-26 | 青岛歌尔声学科技有限公司 | Wearable electronic device and charging method thereof |
| CN107147159A (en) * | 2017-04-11 | 2017-09-08 | 南京中感微电子有限公司 | Charge power supply, it is electrically charged equipment and charging system |
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Application publication date: 20210119 |