WO2023011278A1 - 无线耳机充电电路及充电盒 - Google Patents

无线耳机充电电路及充电盒 Download PDF

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Publication number
WO2023011278A1
WO2023011278A1 PCT/CN2022/108174 CN2022108174W WO2023011278A1 WO 2023011278 A1 WO2023011278 A1 WO 2023011278A1 CN 2022108174 W CN2022108174 W CN 2022108174W WO 2023011278 A1 WO2023011278 A1 WO 2023011278A1
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WIPO (PCT)
Prior art keywords
voltage
circuit
charging
resistor
wireless earphone
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PCT/CN2022/108174
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English (en)
French (fr)
Inventor
叶凡
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深圳英集芯科技股份有限公司
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Publication of WO2023011278A1 publication Critical patent/WO2023011278A1/zh

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • H02J7/00036—Charger exchanging data with battery
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0042—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
    • H02J7/0045—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction concerning the insertion or the connection of the batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • 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
    • 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
    • H04R1/1041—Mechanical or electronic switches, or control elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2420/00—Details of connection covered by H04R, not provided for in its groups
    • H04R2420/07—Applications of wireless loudspeakers or wireless microphones

Definitions

  • This application relates to the field of wireless bluetooth technology, in particular to a wireless earphone charging circuit and a charging box.
  • TWS headphones generally consist of two wireless headphones without cables, independent of each other, and a charging box for charging them.
  • the charging method of TWS earphones is basically realized by the charging box, which can provide additional power supply for the wireless earphones, thereby prolonging the battery life of the wireless earphones, reaching more than ten hours, and meeting the needs of users for all-weather use.
  • the charging box generates a fixed output voltage of 5V through the boost circuit to charge the two wireless earphones at the same time.
  • the charging box can only output 5V voltage to the two earphones at the same time, that is, the charging circuits of the two wireless earphones can only be turned on or off at the same time, and cannot be controlled independently.
  • the fully charged earphone needs to wait for the other wireless earphone to be fully charged before entering standby mode, and when one of the earphones is abnormal (such as a short circuit), the other earphone cannot be charged.
  • the embodiment of the present application provides a wireless earphone charging circuit and a charging box, which can independently control the charging circuits of the left and right wireless earphones without affecting each other, thereby reducing the pressure difference and loss of the earphone charging circuit and improving charging efficiency.
  • a charging circuit for a wireless earphone provided in an embodiment of the present application, the charging circuit for a wireless earphone includes a boost circuit, a first charging circuit, and a second charging circuit, and the boosting circuit is connected to the first charging circuit respectively. circuit and the second charging circuit, the step-up circuit is used to adjust the power supply voltage to the first voltage, the first charging circuit is used to charge the first wireless earphone, and the second charging circuit is used to charge the The second wireless earphone is charged;
  • Both the first charging circuit and the second charging circuit include a linear voltage stabilizing circuit, a communication module and a charging contact, the communication module is respectively connected to the linear voltage stabilizing circuit and the charging contact point, and the linear stabilizing circuit
  • the voltage circuit is connected to the charging contact, and the communication module is used to send the received target battery voltage to the linear voltage regulator circuit, and the linear voltage regulator circuit is used to adjust the charging voltage of the wireless headset according to the target battery voltage , the target battery voltage is the battery voltage of the wireless earphone.
  • an embodiment of the present application provides a wireless earphone charging chip, and the wireless earphone charging chip includes the wireless earphone charging circuit described in the first aspect.
  • an embodiment of the present application provides a charging box, the charging box includes the wireless earphone charging circuit described in the first aspect above or the wireless earphone charging chip described in the second aspect above.
  • the wireless earphone charging circuit proposed by the present application includes a boost circuit, a first charging circuit and a second charging circuit, the boost circuit is used to adjust the power supply voltage to the first voltage, and the first charging circuit is used to charge the first wireless earphone Charging, the second charging circuit is used to charge the second wireless earphone; both the first charging circuit and the second charging circuit include a linear voltage stabilizing circuit, a communication module and a charging contact, and the communication module is respectively connected to the linear voltage stabilizing circuit and the charging contact point, the communication module is used to send the received target battery voltage to the linear voltage regulator circuit, and the linear voltage regulator circuit is used to adjust the charging voltage of the wireless headset according to the target battery voltage, and the target battery voltage is the battery voltage of the wireless headset.
  • This application can independently control the charging circuits of the left and right wireless earphones through the first charging circuit and the second charging circuit without affecting each other;
  • the battery circuit is used to adjust the charging voltage, so that the pressure difference and loss of the earphone charging circuit can be reduced, and the charging efficiency can be improved.
  • FIG. 1 is a schematic structural diagram of a wireless earphone charging circuit in the prior art
  • Fig. 2 is a schematic structural diagram of a wireless earphone charging circuit provided by an embodiment of the present application
  • FIG. 3 is a schematic structural diagram of a boost circuit provided by an embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of a linear voltage stabilizing circuit provided in an embodiment of the present application.
  • FIG. 5 is a schematic structural diagram of another wireless earphone charging circuit provided by an embodiment of the present application.
  • FIG. 2 is a schematic structural diagram of a wireless earphone charging circuit provided by an embodiment of the present application.
  • the wireless earphone charging circuit includes a boost circuit 100, a first charging circuit 200 and a second charging circuit 300, the boost circuit 100 is respectively connected to the first charging circuit 200 and the second charging circuit 300, the boost The voltage circuit 100 is used to adjust the power supply voltage to the first voltage, the first charging circuit 200 is used to charge the first wireless earphone, and the second charging circuit 300 is used to charge the second wireless earphone.
  • the first charging circuit 200 and the second charging circuit 300 both include a linear voltage stabilizing circuit, a communication module and a charging contact, and the communication module is respectively connected to the linear voltage stabilizing circuit and the charging contact point,
  • the linear voltage stabilizing circuit is connected to the charging contact, the communication module is used to send the received target battery voltage to the linear voltage stabilizing circuit, and the linear voltage stabilizing circuit is used to adjust the wireless battery voltage according to the target battery voltage.
  • the charging voltage of the earphone, the target battery voltage is the battery voltage of the wireless earphone.
  • the wireless headset includes the first wireless headset and the second wireless headset.
  • the boost circuit 100 includes a first capacitor C1, a second capacitor C2, a first inductor L1, a first transistor Q1, a second transistor Q2, a first resistor R1, a second resistor R2, comparison amplifier U1 and pulse width modulation PWM driver.
  • one end of the first capacitor C1 is respectively connected to one end of the first inductor L1 and the input end of the boost circuit 100, the other end of the first capacitor C1 is grounded, and the other end of the first inductor L1 One end is respectively connected to the source of the first transistor Q1 and the drain of the second transistor Q2, the drain of the first transistor Q1 is grounded, the gate of the first transistor Q1 is connected to the drain of the second transistor Q2
  • the gates of the gates are all connected to the output terminal of the PWM driver, the input terminal of the PWM driver is connected to the output terminal of the comparative amplifier U1, and the positive input terminal of the comparative amplifier U1 is respectively connected to one end of the first resistor R1 and one end of the second resistor R2, the other end of the second resistor R2 is grounded, and the other end of the first resistor R1 is respectively connected to the source of the first transistor Q1 and one end of the second capacitor C2 and the output end of the booster circuit 100 , the other end of the second capacitor C2 is grounded.
  • the input end of the boost circuit is connected to the power supply battery of the charging box, the first capacitor C1 is an input capacitor, the second capacitor C2 is an output capacitor, and the first inductor L1 is used for energy storage.
  • the first transistor Q1 may be an N-channel MOS transistor, and the second transistor Q2 may be a P-channel MOS transistor.
  • the operation of the boost circuit is divided into a charging state and a discharging state.
  • the charging state that is, during the charging process of the first inductor L1, the first transistor Q1 is turned on, and the voltage Vbat of the power supply battery flows through the second An inductor L1, the current on the first inductor L1 increases linearly at a certain rate, and the first inductor L1 stores energy.
  • the voltage Vbat also leaks to the output port through the parasitic diode of the second transistor Q2 to supply power to the second capacitor C2, so that the voltage across the second capacitor C2 remains above the voltage Vbat.
  • the first transistor Q1 In the discharge state, that is, during the discharge process of the first inductor L1, the first transistor Q1 is turned off and the second transistor Q2 is turned on, and the current of the first inductor L1 cannot change, that is, the first inductor L1 starts to charge the second capacitor C2, so that the second capacitor C2
  • the voltage at both ends of the second capacitor C2 rises, and at this moment, the voltage at the output port of the boost circuit 100 is greater than the voltage Vbat at the input port.
  • the boost circuit continuously repeats the charging process and discharging process of the first inductor L1, so that the voltage at the output port of the boost circuit 100 is greater than the voltage at the input port, thereby boosting the voltage of the power supply battery in the charging box.
  • both the first resistor R1 and the second resistor R2 are adjustable resistors; the boost circuit 100 is used to determine the first resistor R1 according to the ratio of the second resistor R2 voltage value.
  • the inverting input terminal of the comparison amplifier is connected to the VREF reference voltage
  • the first resistor R1 and the second resistor R2 are the feedback resistors of the boost circuit 100, which convert the output voltage of the comparison amplifier U1 to
  • the positive input terminal recovered to the comparison amplifier U1 is compared with the VREF reference voltage, and the effective input signal obtained from the comparison is used to drive the PWM driver to adjust the conduction degree of the first transistor Q1 and the second transistor, thereby realizing the first inductor L1 charging and discharging process.
  • the value of the output voltage of the booster circuit 100 that is, the value of the first voltage can be adjusted by adjusting the ratio of the first resistor R1 to the second resistor R2 .
  • the linear voltage regulator circuit includes a third capacitor C3, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a third transistor Q3 and a voltage controller.
  • one end of the third capacitor C3 is respectively connected to one end of the third resistor R3, the drain of the third transistor Q3 and the input end of the linear regulator circuit, and the other end of the third capacitor C3 grounded, the other end of the third resistor R3 is respectively connected to the output end of the voltage controller and the gate of the third transistor Q3, and the input end of the voltage controller is respectively connected to one end of the fourth resistor R4 and one end of the fifth resistor R5, the other end of the fifth resistor R5 is grounded, and the other end of the fourth resistor R4 is respectively connected to the output end of the linear regulator circuit and the source of the third transistor .
  • the voltage controller can generate different output voltages.
  • the linear regulator circuit can adjust the gate voltage of the third transistor Q3 through different output voltages of the voltage controller, so as to dynamically adjust the conduction degree of the third transistor Q3.
  • the third transistor Q3 is in the linear region;
  • the voltage Vout of the terminal is Vout, the Vout is the output terminal voltage of the booster circuit 100, and the third transistor Q3 is in the fully conducting region; when the linear voltage stabilizing circuit does not output voltage, the third transistor Q3 is in the cut-off region.
  • the voltage Vout1 at the output terminal under the working mode of the linear regulator circuit ranges from 3V to 4.2V.
  • the fourth resistor R4 and the fifth resistor R5 are feedback resistors, and the value of the output voltage Vout1 of the linear regulator circuit can be adjusted by adjusting the ratio between the fourth resistor R4 and the fifth resistor R5.
  • the communication module is used to communicate with the wireless earphone, periodically obtain the power information of the wireless earphone, and feed it back to the linear voltage regulator circuit, so that the linear voltage regulator circuit can adjust the output voltage Vout1 in real time.
  • the linear voltage regulator circuit is used to adjust the charging voltage of the wireless earphone according to the target battery voltage, specifically including: if the target battery voltage is greater than the constant voltage charging voltage, the voltage controller controls the linear regulator to The output voltage of the voltage circuit is a second voltage, and the second voltage is less than or equal to the first voltage; if the target battery voltage is less than or equal to the constant voltage charging voltage, the voltage controller judges that the target battery Whether the voltage is less than a first value, the first value is the sum of the output voltage of the linear regulator circuit and the charging bias voltage; when the target battery voltage is less than or equal to the first value, the voltage controller controls The output voltage of the linear voltage stabilizing circuit is a third voltage, otherwise the voltage controller controls the output voltage of the linear voltage stabilizing circuit to be a fourth voltage, and the fourth voltage is equal to the difference between the third voltage and the adjustment voltage And, the third voltage is less than the second voltage.
  • a timer can be set in the communication module, and the timing of the timer can be preset, such as 1 minute, 2 minutes, 4 minutes, etc., or can be set according to the charging speed of the wireless earphone, which is not limited here.
  • the timing time is the normal charging time of the wireless earphone, that is, the linear voltage regulator circuit is in the direct mode; when the timing time is over, the communication module can obtain the earphone power from the wireless earphone, and feed back the earphone power to the linear voltage regulator circuit, so that the linear The voltage regulator circuit adjusts the output voltage to reduce the pressure difference and loss of the wireless earphone charging circuit.
  • the voltage controller can judge the current charging state of the wireless earphone according to the target battery voltage. If the wireless earphone has entered the constant-voltage charging stage, that is, when the target battery voltage is greater than the constant-voltage charging voltage Vc, the linear voltage regulator circuit is set to the direct mode, and the wireless earphone is charged normally. If the wireless headset is in the constant current charging stage, that is, when the target battery voltage is greater than the constant voltage charging voltage Vc, the voltage controller then judges whether the target battery voltage is less than or equal to the sum of the current output voltage Vout1 of the linear voltage regulator circuit and the charging bias voltage Vs .
  • the output voltage adjustment process will end and continue to charge the wireless headset with the current output voltage; if the target battery voltage is greater than the linear voltage regulator
  • the sum of the current output voltage Vout1 of the voltage regulator circuit and the charging bias voltage Vs indicates that the output voltage Vout1 of the current linear voltage regulator circuit needs to be adjusted, so the linear regulator circuit is controlled to add an adjustment value on the basis of the current output voltage Vout Vstep, the adjustment value can be a negative value, and is used to reduce the current output voltage Vout of the linear regulator circuit.
  • the constant-voltage charging voltage Vc, the charging bias voltage Vs, and the adjustment value Vstep can be configured with different values according to actual battery requirements, which are not limited here.
  • the linear voltage stabilizing circuit is also used to control the wireless earphone to enter a standby state when the wireless earphone is fully charged.
  • the wireless earphone when the wireless earphone is fully charged, it can be in a standby state, so as to reduce the pressure difference of the charging circuit of the wireless earphone and the loss of the wireless earphone.
  • the linear voltage stabilizing circuit is also used to control the wireless earphone to enter the standby state when the wireless earphone is fully charged, specifically including: when the target battery voltage is greater than or equal to a preset voltage, the voltage controller controls the The output voltage of the linear regulator circuit is the fifth voltage.
  • the voltage controller receives the target battery voltage, it compares the target battery voltage with the preset voltage. If the target battery voltage is greater than or equal to the preset voltage, it can control the linear voltage regulator circuit not to output voltage, that is, control the third transistor Q3 is off.
  • the wireless earphone there may be two ways for the wireless earphone to enter the standby state.
  • One is that the charging box enters the standby mode by sending an instruction, specifically, the communication module sends an instruction to instruct the linear voltage regulator circuit to be directly turned off, and the output voltage is 0V.
  • the other is to control the linear regulator circuit to output a constant voltage to the wireless earphone, wherein the constant voltage can be 5v, 3v, 2v, etc. according to the requirements of different wireless earphones.
  • both the fourth resistor and the fifth resistor are adjustable resistors; the linear voltage stabilizing circuit is used to determine the value of the target output voltage according to the ratio between the fourth resistor and the fifth resistor,
  • the target output voltage includes the second voltage, the third voltage, the fourth voltage and the fifth voltage.
  • both the fourth resistor R4 and the fifth resistor R5 are feedback resistors, and the values of the second voltage, the third voltage, the fourth voltage and the fifth voltage can be adjusted by adjusting the ratio of the fourth resistor R4 to the fifth resistor R5.
  • the wireless earphone charging circuit includes a boost circuit, a first charging circuit and a second charging circuit, the boost circuit is used to adjust the power supply voltage to the first voltage, and the first charging circuit is used to Charge the first wireless earphone, and the second charging circuit is used to charge the second wireless earphone; both the first charging circuit and the second charging circuit include a linear voltage regulator circuit, a communication module and a charging contact, and the communication module is respectively connected to a linear The voltage stabilizing circuit and the charging contact point, the communication module is used to send the received target battery voltage to the linear voltage stabilizing circuit, the linear voltage stabilizing circuit is used to adjust the charging voltage of the wireless earphone according to the target battery voltage, the target battery voltage is the battery of the wireless earphone Voltage.
  • This application can independently control the charging circuits of the left and right wireless earphones through the first charging circuit and the second charging circuit without affecting each other;
  • the battery circuit is used to adjust the charging voltage, so that the pressure difference and loss of the earphone charging circuit can be reduced, and the charging efficiency can be improved.
  • FIG. 5 is a schematic structural diagram of another wireless earphone charging circuit provided by an embodiment of the present application.
  • the wireless earphone charging circuit includes a boost circuit 100 , a first linear voltage stabilizing circuit 210 , a second linear voltage stabilizing circuit 310 , a communication module 400 , a first charging contact 220 and a second charging contact 320 .
  • the boost circuit 100 is respectively connected to the first linear voltage stabilizing circuit 210 and the second linear voltage stabilizing circuit 310; the first linear voltage stabilizing circuit 210 is respectively connected to the communication module 400 and the second linear voltage stabilizing circuit A charging contact 220 ; the second linear voltage stabilizing circuit 310 is respectively connected to the communication module 400 and the second charging contact 320 .
  • first linear voltage stabilizing circuit 210, the communication module 400 and the first charging contact 220 form a first charging circuit 200, and the first charging circuit 200 is used to charge the first wireless earphone.
  • the two-linear voltage stabilizing circuit 310, the communication module 400 and the second charging contact 320 form a second charging circuit 300, and the second charging circuit 300 is used to charge the second wireless earphone.
  • the communication module can receive battery voltages of the first wireless earphone and the second wireless earphone. Then the battery voltage of the first wireless earphone is sent to the first linear voltage stabilizing circuit, so that the first linear voltage stabilizing circuit adjusts its output voltage according to the battery voltage of the first wireless earphone; the battery voltage of the second wireless earphone is sent to the second Two linear voltage stabilizing circuits, so that the second linear voltage stabilizing circuit adjusts its output voltage according to the battery voltage of the second wireless earphone.
  • the charging circuit of each wireless earphone is linear charging
  • the charging box can dynamically adjust the output voltages of the first linear voltage stabilizing circuit and the second linear voltage stabilizing circuit after obtaining the battery voltage of the wireless earphone, so that The charging box can adapt the optimal output voltage to the battery voltage of the wireless earphone end, and minimize the pressure difference and loss of the wireless earphone charging circuit, thereby improving charging efficiency, improving temperature rise, and realizing fast charging with high current.
  • first and second mentioned in the embodiment of the present application are used to distinguish multiple objects, and are not used to limit the sequence, timing, priority or importance of multiple objects.
  • first information and the second information are only for distinguishing different information, and do not indicate the difference in content, priority, sending order, or degree of importance of the two kinds of information.
  • the embodiment of the present application also provides a wireless earphone charging chip, and the wireless earphone charging chip includes any wireless earphone charging circuit described in the above embodiments.
  • An embodiment of the present application further provides a charging box, the charging box includes any one of the wireless earphone charging chip or the wireless earphone charging circuit described in the above embodiments.
  • the disclosed wireless earphone charging circuit can be implemented in other ways.
  • the embodiments of the wireless earphone charging circuit described above are only illustrative, and for example, other components with the same function can also be used for the components in the above circuit.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of circuits or components may be in electrical or other forms.
  • each circuit in each embodiment of the present application may be integrated into one circuit board, each circuit may exist separately, or two or more circuits may be integrated into one circuit board.

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  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract

本申请实施例公开了一种无线耳机充电电路及充电盒，该电路包括升压电路、第一充电电路和第二充电电路，第一充电电路用于给第一无线耳机进行充电，第二充电电路用于给第二无线耳机进行充电；第一充电电路和第二充电电路均包括线性稳压电路、通信模块和充电触点，该通信模块用于将接收的目标电池电压发送给线性稳压电路，该线性稳压电路用于根据目标电池电压调整无线耳机的充电电压，目标电池电压为无线耳机的电池电压。本申请通过第一充电电路和第二充电电路能够对左右无线耳机的充电电路进行独立控制、互不影响，从而可以减少耳机充电回路的压差和损耗，提高充电效率。

Description

无线耳机充电电路及充电盒
本申请要求于2021年08月2日提交中国专利局、申请号为2021108806406，申请名称为“无线耳机充电电路及充电盒”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及无线蓝牙技术领域，尤其涉及一种无线耳机充电电路及充电盒.
背景技术
真正无线立体声(True Wireless Stereo，TWS)耳机一般由两只没有线缆、相互独立的无线耳机和一个为它们充电的充电盒组成。其中TWS耳机的充电方式基本上是由充电盒实现，充电盒可以为无线耳机提供额外的电源补充，从而延长无线耳机的续航时间，达到十小时以上，满足用户的全天候使用需求。
目前，如图1所示，充电盒通过boost升压电路产生5V的固定输出电压给两个无线耳机同时进行充电，当两个无线耳机均被充满后，充电和关闭boost升压电路进入待机状态以节省功耗。但是，充电盒只能同时给两只耳机输出5V电压，即两个无线耳机的充电电路只能同时打开或关闭，不能独立控制。因此，当两个无线耳机的电量不一样时，充满电的耳机需要等待另一个无线耳机充满才能进待机，并且当其中一个耳机异常时(比如短路)，另外一个耳机也无法充电。
本申请实施例提供了一种无线耳机充电电路及充电盒，能够对左右无线耳机的充电电路进行独立控制、互不影响，从而可以减少耳机充电回路的压差和损耗，提高充电效率。
第一方面，本申请实施例提供的一种无线耳机充电电路，所述无线耳机充电电路包括升压电路、第一充电电路和第二充电电路，所述升压电路分别连接所述第一充电电路和所述第二充电电路，所述升压电路用于将电源电压调整至第一电压，所述第一充电电路用于给第一无线耳机进行充电，所述第二充电电路用于给第二无线耳机进行充电；
所述第一充电电路和所述第二充电电路均包括线性稳压电路、通信模块和充电触点，所述通信模块分别连接所述线性稳压电路和所述充电接触点，所述线性稳压电路连接所述充电触点，所述通信模块用于将接收的目标电池电压发送给所述线性稳压电路，所述线性稳压电路用于根据所述目标电池电压调整无线耳机的充电电压，所述目标电池电压为所述无线耳机的电池电压。
第二方面，本申请实施例提供一种无线耳机充电芯片，所述无线耳机充电芯片包括上述第一方面所述的无线耳机充电电路。
第三方面，本申请实施例提供一种充电盒，所述充电盒包括上述第一方面所述的无线耳机充电电路或上述第二方面所述的无线耳机充电芯片。
本申请提出的无线耳机充电电路，包括升压电路、第一充电电路和第二充电电路，升压电路用于将电源电压调整至第一电压，第一充电电路用于给第一无线耳机进行充电，第二充电电路用于给第二无线耳机进行充电；第一充电电路和第二充电电路均包括线性稳压电路、通信模块和充电触点，通信模块分别连接线性稳压电路和充电接触点，通信模块用于将接收的目标电池电压发送给线性稳压电路，线性稳压电路用于根据目标电池电压调整无线耳机的充电电压，目标电池电压为无线耳机的电池电压。本申请通过第一充电电路和第二充电电路能够对左右无线耳机的充电电路进行独立控制、互不影响；并且通过线性稳压电路调整无线耳机的充电电压，可以使得充电盒能够根据无线耳机的电池电路来调整充电电压，从而可以减少耳机充电回路的压差和损耗，提高充电效率。
附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是现有技术的无线耳机充电电路的结构示意图；
图2是本申请实施例提供的一种无线耳机充电电路的结构示意图；
图3是本申请实施例提供的一种升压电路的结构示意图；
图4是本申请实施例提供的一种线性稳压电路的结构示意图；
图5是本申请实施例提供的另一种无线耳机充电电路的结构示意图。
具体实施方式
为了本技术领域人员更好理解本申请的技术方案，下面结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本申请的部分实施例，而并非全部的实施例。基于本申请实施例的描述，本领域技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请所保护的范围。
本申请的说明书和权利要求书及上述附图中的术语“第一”、“第二”等是用于区别不同对象，而不是用于描述特定顺序。此外，术语“包括”和“具有”以及它们任何变形，意图在于覆盖不排他的包含。例如，包含了一系列步骤或单元的过程、方法、软件、产品或设备没有限 定于已列出的步骤或单元，而是还包括没有列出的步骤或单元，或还包括对于这些过程、方法、产品或设备固有的其他步骤或单元。
在本文中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。
下面结合附图对本申请实施例进行介绍，附图中相交导线的交叉处有圆点表示导线相接，交叉处无圆点表示导线不相接。
请参阅图2，图2是本申请实施例提供的一种无线耳机充电电路的结构示意图。该无线耳机充电电路包括升压电路100、第一充电电路200和第二充电电路300，所述升压电路100分别连接所述第一充电电路200和所述第二充电电路300，所述升压电路100用于将电源电压调整至第一电压，所述第一充电电路200用于给第一无线耳机进行充电，所述第二充电电路300用于给第二无线耳机进行充电。
其中，所述第一充电电路200和所述第二充电电路300均包括线性稳压电路、通信模块和充电触点，所述通信模块分别连接所述线性稳压电路和所述充电接触点，所述线性稳压电路连接所述充电触点，所述通信模块用于将接收的目标电池电压发送给所述线性稳压电路，所述线性稳压电路用于根据所述目标电池电压调整无线耳机的充电电压，所述目标电池电压为所述无线耳机的电池电压。
进一步地，所述无线耳机包括所述第一无线耳机和所述第二无线耳机。
可选的，如图3所示，所述升压电路100包括第一电容C1、第二电容C2、第一电感L1、第一晶体管Q1、第二晶体管Q2、第一电阻R1、第二电阻R2、比较放大器U1和脉宽调制PWM驱动器。
其中，所述第一电容C1的一端分别连接所述第一电感L1的一端和所述升压电路100的输入端，所述第一电容C1的另一端接地，所述第一电感L1的另一端分别连接所述第一晶体管Q1的源极和所述第二晶体管Q2的漏极，所述第一晶体管Q1的漏极接地，所述第一晶体管Q1的栅极和所述第二晶体管Q2的栅极均连接所述PWM驱动器的输出端，所述PWM驱动器的输入端连接所述比较放大器U1的输出端，所述比较放大器U1的正向输入端分别连接所述第一电阻R1的一端和所述第二电阻R2的一端，所述第二电阻R2的另一端接地，所述第一电阻R1的另一端分别连接所述第一晶体管Q1的源极、所述第二电容C2的一端和所述升压电路100的输出端，所述第二电容C2的另一端接地。
其中，该升压电路的输入端连接充电盒的供电电池，该第一电容C1为输入电容，第二电容C2为输出电容，第一电感L1用于储能。所述第一晶体管Q1可为N沟道MOS管，所述第二晶体管Q2可为P沟道MOS管。
在本申请实施例中，所述升压电路的工作分为充电状态和放电状态，在充电状态，即第一电感L1充电过程中，第一晶体管Q1导通，供电电池的电压Vbat流过第一电感L1，第一电感L1上的电流以一定的比率线性增加，第一电感L1存储能量。同时电压Vbat也通过第二晶体管Q2的寄生二极管漏电到输出端口，给第二电容C2供电，使得第二电容C2两端的电压保持在电压Vbat之上。在放电状态，即第一电感L1放电过程中，第一晶体管Q1截止、第二晶体管Q2导通，第一电感L1的电流不能变化，即第一电感L1开始给第二电容C2充电，使得第二电容C2两端的电压升高，此时升压电路100的输出端口的电压大于输入端口的电压Vbat。
基于此，升压电路通过不断重复第一电感L1的充电过程和放电过程，使得升压电路100输出端口的电压大于输入端口的电压，从而实现对充电盒中供电电池电压的升压。
其中，所述第一电阻R1和所述第二电阻R2均为可调电阻；所述升压电路100用于根据所述第一电阻R1和所述第二电阻R2的比值确定所述第一电压的值。
具体地，所述比较放大器的反向输入端连接VREF基准电压，所述第一电阻R1和所述第二电阻R2为所述升压电路100的反馈电阻，其通过将比较放大器U1的输出电压回收到比较放大器U1的正向输入端与VREF基准电压进行比较，并将比较所得的有效输入信号去驱动PWM驱动器调节第一晶体管Q1和第二晶体管的导通程度，从而实现第一电感L1的充放电过程。其中通过调节第一电阻R1和第二电阻R2的比值可以调整升压电路100的输出电压的值，即第一电压的值。
可选的，如图4所示，所述线性稳压电路包括第三电容C3、第三电阻R3、第四电阻R4、第五电阻R5、第三晶体Q3管和电压控制器。
其中，所述第三电容C3的一端分别连接所述第三电阻R3的一端、所述第三晶体管Q3的漏极和所述线性稳压电路的输入端，所述第三电容C3的另一端接地，所述第三电阻R3的另一端分别连接所述电压控制器的输出端和所述第三晶体管Q3的栅极，所述电压控制器的输入端分别连接所述第四电阻R4的一端和所述第五电阻R5的一端，所述第五电阻R5的另一端接地，所述第四电阻R4的另一端分别连接所述线性稳压电路的输出端和所述第三晶体管的源极。
其中，电压控制器可产生不同的输出电压。线性稳压电路通过电压控制器的不同输出电 压可调节第三晶体管Q3栅极电压，从而来动态调整第三晶体管Q3的导通程度。在线性稳压电路处于工作模式，即根据无线耳机的电池电压动态调整输出电压时，第三晶体管Q3处于线性区；在线性稳压电路处于直通模式，即线性稳压电路输出端的电压Vout1等于输入端的电压Vout时，该Vout为升压电路100的输出端电压，第三晶体管Q3处于完全导通区；在线性稳压电路不输出电压时，第三晶体管Q3处于截止区。
示例的，在升压电路100的输出端电压Vout为5V时，线性稳压电路工作模式下的输出端电压Vout1的范围为3V～4.2V。
可选的，第四电阻R4和第五电阻R5是反馈电阻，通过调节第四电阻R4和第五电阻R5的比值可以调整线性稳压电路的输出电压Vout1的值。
在本申请实施例中，通信模块用于与无线耳机进行通信，周期性地获取无线耳机的电量信息，并反馈给线性稳压电路，以使线性稳压电路实时调整输出电压Vout1。
可选的，所述线性稳压电路用于根据所述目标电池电压调整无线耳机的充电电压，具体包括：若所述目标电池电压大于恒压充电电压，所述电压控制器控制所述线性稳压电路的输出电压为第二电压，所述第二电压小于或等于所述第一电压；若所述目标电池电压小于或等于所述恒压充电电压，所述电压控制器判断所述目标电池电压是否小于第一值，所述第一值为所述线性稳压电路的输出电压与充电偏置电压的和；在所述目标电池电压小于或等于第一值时，所述电压控制器控制所述线性稳压电路的输出电压为第三电压，否则所述电压控制器控制所述线性稳压电路的输出电压为第四电压，所述第四电压等于所述第三电压与调整电压的和，所述第三电压小于所述第二电压。
其中，在通信模块中可设置一个定时器，该定时器定时时间可根据预先设置，例如1分钟、2分钟、4分钟等，也可根据无线耳机的充电速度进行设置，在此不做限定。其中定时时间内为无线耳机正常充电时间，即线性稳压电路处于直通模式；当定时时间结束时，通信模块可向无线耳机获取耳机电量，并将耳机电量反馈给线性稳压电路，以使线性稳压电路对输出电压进行调整，以减少无线耳机充电回路的压差和损耗。
具体地，线性稳压电路接收到耳机电量，即目标电池电压后，电压控制器可根据目标电池电压判断无线耳机当前的充电状态。若无线耳机已经进入恒压充电阶段，即目标电池电压大于恒压充电电压Vc时，则将线性稳压电路设置为直通模式，无线耳机正常充电。若无线耳机在恒流充电阶段，即目标电池电压大于恒压充电电压Vc时，电压控制器再判断目标电池电压是否小于或等于线性稳压电路当前的输出电压Vout1与充电偏置电压Vs的和。若目标电池电压小于线性稳压电路当前的输出电压Vout1与充电偏置电压Vs的和，则结束此次输出 电压调整流程并继续以当前输出电压给无线耳机进行充电；若目标电池电压大于线性稳压电路当前的输出电压Vout1与充电偏置电压Vs的和，则表示当前的线性稳压电路的输出电压Vout1需要调整，因此控制线性稳压电路在当前的输出电压Vout的基础上增加一个调整值Vstep，该调整值可为负值，用于降低线性稳压电路在当前的输出电压Vout。
需要说明的是，恒压充电电压Vc，充电偏置电压Vs，调整值Vstep均可根据实际电池需求配置不同值，在此不做限定。
可选的，所述线性稳压电路还用于在所述无线耳机充满时控制所述无线耳机进入待机状态。
在本申请实施例中，当无线耳机充满电之后就可进行待机状态，以减少无线耳机充电回路的压差和无线耳机的损耗。
其中，所述线性稳压电路还用于在所述无线耳机充满时控制所述无线耳机进入待机状态，具体包括：在所述目标电池电压大于或等于预设电压时，电压控制器控制所述线性稳压电路的输出电压为第五电压。
具体地，在对线性稳压电路的输出电压进行调整之前，可先判断无线耳机是否已充满。若无线耳机已经充满，则将线性稳压电路关闭，并设置无线耳机需要的待机条件；若无线耳机未被充满，则调整线性稳压电路的输出电压。具体为电压控制器在接收到目标电池电压后，将目标电池电压与预设电压进行比较，目标电池电压大于或等于预设电压，则可控制线性稳压电路不输出电压，即控制第三晶体管Q3处于截止状态。
在本申请实施例中，无线耳机进入待机状态可包括两种方式。一种是充电盒通过发指令的方式进入待机，具体为通信模块发送指令指示线性稳压电路直接关闭、输出电压为0V。另一种是控制线性稳压电路的输出一个恒定电压给无线耳机，其中根据不同无线耳机的需求，该恒定电压可以是5v、3v、2v等。
可选的，所述第四电阻和所述第五电阻均为可调电阻；所述线性稳压电路用于根据所述第四电阻和所述第五电阻的比值确定目标输出电压的值，所述目标输出电压包括所述第二电压、所述第三电压、所述第四电压和所述第五电压。
其中，第四电阻R4和第五电阻R5均是反馈电阻，通过调节第四电阻R4与第五电阻R5的比值可调节第二电压、第三电压、第四电压和第五电压的值。
可以看出，本申请实施例提供的无线耳机充电电路，包括升压电路、第一充电电路和第二充电电路，升压电路用于将电源电压调整至第一电压，第一充电电路用于给第一无线耳机进行充电，第二充电电路用于给第二无线耳机进行充电；第一充电电路和第二充电电路均包 括线性稳压电路、通信模块和充电触点，通信模块分别连接线性稳压电路和充电接触点，通信模块用于将接收的目标电池电压发送给线性稳压电路，线性稳压电路用于根据目标电池电压调整无线耳机的充电电压，目标电池电压为无线耳机的电池电压。本申请通过第一充电电路和第二充电电路能够对左右无线耳机的充电电路进行独立控制、互不影响；并且通过线性稳压电路调整无线耳机的充电电压，可以使得充电盒能够根据无线耳机的电池电路来调整充电电压，从而可以减少耳机充电回路的压差和损耗，提高充电效率。
示例性地，如图5所示，图5是本申请实施例提供的另一种无线耳机充电电路的结构示意图。该无线耳机充电电路包括升压电路100、第一线性稳压电路210、第二线性稳压电路310、通信模块400、第一充电触点220和第二充电触点320。
其中，所述升压电路100分别连接所述第一线性稳压电路210和所述第二线性稳压电路310；所述第一线性稳压电路210分别连接所述通信模块400和所述第一充电触点220；所述第二线性稳压电路310分别连接所述通信模块400和所述第二充电触点320。
进一步地，所述第一线性稳压电路210、通信模块400和第一充电触点220形成第一充电电路200，所述第一充电电路200用于给第一无线耳机进行充电，所述第二线性稳压电路310、通信模块400和第二充电触点320形成第二充电电路300，所述第二充电电路300用于给第二无线耳机进行充电。
具体地，通信模块可接收第一无线耳机和第二无线耳机的电池电压。然后将第一无线耳机的电池电压发送给第一线性稳压电路，以使得第一线性稳压电路根据第一无线耳机的电池电压调整其输出电压；将第二无线耳机的电池电压发送给第二线性稳压电路，以使得第二线性稳压电路根据第二无线耳机的电池电压调整其输出电压。
其中所述第一线性稳压电路和所述第二线性稳压电路的电路结构和实现原理与图2中的线性稳压电路相同，具体可参照上述图2中的描述，在此不再赘述。
在本申请实施例中，每个无线耳机的充电电路是线性充电，充电盒可通过获取的无线耳机的电池电压后动态调节第一线性稳压电路和第二线性稳压电路的输出电压，使得充电盒可以最优的输出电压适配无线耳机端的电池电压，尽量减少无线耳机充电回路的压差和损耗，从而提高充电效率，改善温升，也可以实现大电流快速充电。
本申请实施例提及“第一”、“第二”等序数词是用于对多个对象进行区分，不用于限定多个对象的顺序、时序、优先级或者重要程度。例如，第一信息和第二信息，只是为了区分不同的信息，而并不是表示这两种信息的内容、优先级、发送顺序或者重要程度等的不同。
本申请实施例还提供一种无线耳机充电芯片，所述无线耳机充电芯片包括上述实施例记 载的任一无线耳机充电电路。
本申请实施例还提供一种充电盒，所述充电盒包括上述实施例记载的任一所述的无线耳机充电芯片或无线耳机充电电路。
在上述实施例中，对各个实施例的描述都各有侧重，某个实施例中没有详述的部分，可以参见其他实施例的相关描述。
在本申请所提供的几个实施例中，应该理解到，所揭露的无线耳机充电电路，可通过其它的方式实现。例如，以上所描述的无线耳机充电电路实施例仅仅是示意性的，例如上述电路中的元器件也可以采用其他相同功能的元器件。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，电路或元器件的间接耦合或通信连接，可以是电性或其它的形式。
另外，在本申请各个实施例中的各电路可以集成在一个电路板中，也可以是各个电路单独物存在，也可以两个或两个以上电路集成在一个电路板中。
以上对本申请实施例进行了详细介绍，本文中应用了具体个例对本申请的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本申请及其核心思想；同时，对于本领域的一般技术人员，依据本申请的思想，在具体实施方式及应用范围上均会有改变之处，综上上述，本说明书内容不应理解为对本申请的限制。

Claims (10)

  1. 一种无线耳机充电电路，其特征在于，所述无线耳机充电电路包括升压电路、第一充电电路和第二充电电路，所述升压电路分别连接所述第一充电电路和所述第二充电电路，所述升压电路用于将电源电压调整至第一电压，所述第一充电电路用于给第一无线耳机进行充电，所述第二充电电路用于给第二无线耳机进行充电；
    所述第一充电电路和所述第二充电电路均包括线性稳压电路、通信模块和充电触点，所述通信模块分别连接所述线性稳压电路和所述充电触点，所述线性稳压电路连接所述充电触点，所述通信模块用于将接收的目标电池电压发送给所述线性稳压电路，所述线性稳压电路用于根据所述目标电池电压调整无线耳机的充电电压，所述目标电池电压为所述无线耳机的电池电压。
  2. 根据权利要求1所述的电路，其特征在于，所述升压电路包括第一电容、第二电容、第一电感、第一晶体管、第二晶体管、第一电阻、第二电阻、比较放大器和脉宽调制PWM驱动器；
    所述第一电容的一端分别连接所述第一电感的一端和所述升压电路的输入端，所述第一电容的另一端接地，所述第一电感的另一端分别连接所述第一晶体管的源极和所述第二晶体管的漏极，所述第一晶体管的漏极接地，所述第一晶体管的栅极和所述第二晶体管的栅极均连接所述PWM驱动器的输出端，所述PWM驱动器的输入端连接所述比较放大器的输出端，所述比较放大器的正向输入端分别连接所述第一电阻的一端和所述第二电阻的一端，所述第二电阻的另一端接地，所述第一电阻的另一端分别连接所述第一晶体管的源极、所述第二电容的一端和所述升压电路的输出端，所述第二电容的另一端接地。
  3. 根据权利要求2所述的电路，其特征在于，所述第一电阻和所述第二电阻均为可调电阻；
    所述升压电路用于根据所述第一电阻和所述第二电阻的比值确定所述第一电压的值。
  4. 根据权利要求1-3任一项所述的电路，其特征在于，所述线性稳压电路包括第三电容、第三电阻、第四电阻、第五电阻、第三晶体管和电压控制器；
    所述第三电容的一端分别连接所述第三电阻的一端、所述第三晶体管的漏极和所述线性稳压电路的输入端，所述第三电容的另一端接地，所述第三电阻的另一端分别连接所述电压控制器的输出端和所述第三晶体管的栅极，所述电压控制器的输入端分别连接所述第四电阻的一端和所述第五电阻的一端，所述第五电阻的另一端接地，所述第四电阻的另一端分别连接所述线性稳压电路的输出端和所述第三晶体管的源极。
  5. 根据权利要求4所述的电路，其特征在于，所述线性稳压电路用于根据所述目标电池电压调整无线耳机的充电电压，具体包括：
    若所述目标电池电压大于恒压充电电压，所述电压控制器控制所述线性稳压电路的输出电压为第二电压，所述第二电压小于或等于所述第一电压；
    若所述目标电池电压小于或等于所述恒压充电电压，所述电压控制器判断所述目标电池电压是否小于第一值，所述第一值为所述线性稳压电路的输出电压与充电偏置电压的和；
    在所述目标电池电压小于或等于第一值时，所述电压控制器控制所述线性稳压电路的输出电压为第三电压，否则所述电压控制器控制所述线性稳压电路的输出电压为第四电压，所述第四电压等于所述第三电压与调整值的和，所述第三电压小于所述第二电压。
  6. 根据权利要求5所述的电路，其特征在于，所述线性稳压电路还用于在所述无线耳机充满时控制所述无线耳机进入待机状态。
  7. 根据权利要求6所述的电路，其特征在，所述线性稳压电路还用于在所述无线耳机充满时控制所述无线耳机进入待机状态，具体包括：
    在所述目标电池电压大于或等于预设电压时，所述电压控制器控制所述线性稳压电路的输出电压为第五电压。
  8. 根据权利要求7所述的电路，其特征在于，所述第四电阻和所述第五电阻均为可调电阻；
    所述线性稳压电路用于根据所述第四电阻和所述第五电阻的比值确定目标输出电压的值，所述目标输出电压包括所述第二电压、所述第三电压、所述第四电压和所述第五电压。
  9. 一种无线耳机充电芯片，其特征在于，所述无线耳机充电芯片包括如权利要求1-8任一项所述的无线耳机充电电路。
  10. 一种充电盒，其特征在于，所述充电盒包括如权利要求1-8任一项所述的无线耳机充电电路或如权利要求9所述的无线耳机充电芯片。
PCT/CN2022/108174 2021-08-02 2022-07-27 无线耳机充电电路及充电盒 WO2023011278A1 (zh)

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