CN212343362U - Wireless earphone and circuit thereof, charging bin and circuit thereof, and charging system - Google Patents
Wireless earphone and circuit thereof, charging bin and circuit thereof, and charging system Download PDFInfo
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- CN212343362U CN212343362U CN202021039355.9U CN202021039355U CN212343362U CN 212343362 U CN212343362 U CN 212343362U CN 202021039355 U CN202021039355 U CN 202021039355U CN 212343362 U CN212343362 U CN 212343362U
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Abstract
The utility model relates to a wireless earphone and circuit, storehouse and circuit charge thereof and charging system charge thereof. The wireless earphone circuit comprises a feedback unit, a first battery and a divider resistor, wherein the first battery and the divider resistor are connected in series between a first grounding end and a first voltage end, the first voltage end and the first grounding end can be connected with a charging bin circuit in a disconnectable manner, and the feedback unit is used for feeding back a first voltage value of the first battery or feeding back a function value taking the first voltage value of the first battery as a variable to the charging bin circuit, so that the charging bin circuit can provide charging voltage according to the sum of the first voltage value and the voltage drop of the set divider resistor during charging. The utility model discloses can improve charge efficiency, reduce energy loss to simplify wireless earphone circuit, be favorable to reducing the volume and the reduce cost that use this circuit's wireless earphone.
Description
Technical Field
The utility model relates to an earphone technical field especially relates to a wireless earphone and circuit, the storehouse of charging and circuit, charging system thereof.
Background
Compared with wired earphones, wireless earphones have the advantage of being convenient to carry, and are therefore increasingly popular with people. The problems of low charging efficiency and large energy loss exist in charging of a True Wireless Stereo (TWS) earphone in the prior art, and the Wireless earphone is large in size and high in cost due to the complex circuit design in the Wireless earphone.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming above-mentioned technical problem, provide a wireless earphone and circuit, the storehouse of charging and circuit, charging system thereof, can improve charge efficiency, reduce energy loss, and simplified the circuit structure in the wireless earphone, be favorable to reducing wireless earphone's volume and reduce cost.
In order to achieve the above object, the utility model provides an aspect provides a wireless earphone circuit, including feedback unit, the first battery and the divider resistance of series connection between first earthing terminal and first voltage end, first voltage end with first earthing terminal can be connected with the storehouse circuit that charges disconnectably, the feedback unit be used for to the storehouse circuit feedback that charges the first voltage numerical value or the feedback of first battery with the first voltage numerical value of first battery is the function value of variable, so that the storehouse circuit that charges can be according to first voltage numerical value and setting the sum of the pressure drop when divider resistance charges provides charging voltage.
Optionally, the feedback unit includes an analog-to-digital converter connected to the first battery, the analog-to-digital converter being configured to output the first voltage value of the first battery, wherein: the analog-to-digital converter is connected with the charging bin circuit during charging so as to feed back the first voltage value to the charging bin circuit; or, the feedback unit further includes a first wireless communication unit connected to the analog-to-digital converter, and the first wireless communication unit can communicate with a second wireless communication unit of the charging bin circuit to feed back the first voltage value to the charging bin circuit.
Optionally, the feedback unit includes a setting unit, an adder, and an analog-to-digital converter connected to the first battery, the analog-to-digital converter is configured to output the first voltage value of the first battery, the setting unit is configured to set a second voltage value, the second voltage value represents a voltage drop of a charging current across the voltage dividing resistor, and the adder is configured to calculate a sum of the first voltage value and the second voltage value, where: the adder is connected with the charging bin circuit during charging and is used for feeding back the sum of the first voltage value and the second voltage value to the charging bin circuit; or, the feedback unit further comprises a first wireless communication unit connected with the adder, and the first wireless communication unit can communicate with a second wireless communication unit of the charging bin circuit to feed back the voltage value calculated by the adder to the charging bin circuit.
A second aspect of the present invention provides a wireless headset, comprising the above first aspect of the wireless headset circuit.
The utility model discloses the third aspect provides a storehouse circuit charges, including voltage regulation unit, second battery and with the second battery links to each other in order to be used for right the second battery carries out the charge management unit of charge management, voltage regulation unit's output and second earthing terminal can be connected with wireless earphone circuit disconnectably, just voltage regulation unit can be according to total voltage numerical value, will the first voltage regulation of second battery input exports behind the second voltage, in order to right wireless earphone circuit's first battery charges, total voltage numerical value is: the sum of a second voltage value set by the charging bin circuit and a first voltage value fed back by the wireless earphone circuit; or a function value which is fed back by the wireless earphone circuit and takes the first voltage value as a variable; and wherein: the absolute value of the second voltage is greater than or equal to the first voltage; or the absolute value of the second voltage is less than or equal to the first voltage.
Optionally, the charging bin circuit further includes a setting unit and an adder, the setting unit is configured to set the second voltage value, the second voltage value represents a voltage drop of a charging current across a voltage dividing resistor of the wireless headset circuit, which is connected in series with the first battery, and the adder is capable of receiving the first voltage value of the first battery fed back by the wireless headset circuit to calculate a sum of the first voltage value and the second voltage value to be output to the voltage adjusting unit as the total voltage value, wherein: the adder is connected with the wireless earphone circuit during charging so as to be used for receiving the first voltage value; or, the charging bin circuit further comprises a second wireless communication unit connected with the adder, and the second wireless communication unit can communicate with the first wireless communication unit of the wireless earphone circuit, so that the adder receives the first voltage value fed back by the wireless earphone circuit.
Optionally, the voltage regulating unit is capable of receiving the total voltage value fed back by the wireless headset circuit, wherein: the voltage adjusting unit is connected with the wireless earphone circuit during charging so as to be used for receiving the total voltage value; or, the charging bin circuit further comprises a second wireless communication unit connected with the voltage adjusting unit, and the second wireless communication unit can communicate with the first wireless communication unit of the wireless earphone circuit, so that the voltage adjusting unit receives the total voltage value fed back by the wireless earphone circuit.
Optionally, the voltage adjusting unit includes a digital-to-analog conversion module and an adjusting module connected to the digital-to-analog conversion module, the digital-to-analog conversion module can convert the received voltage value into an analog voltage signal and output the analog voltage signal to the adjusting module, the adjusting module adjusts the first voltage into the second voltage according to the analog voltage signal and outputs the second voltage, the voltage value received by the digital-to-analog conversion module is equal to the second voltage value, wherein: the voltage value received by the digital-to-analog conversion module is the total voltage value; or, the charging bin circuit further comprises a selection unit for receiving the total voltage value, and when the first battery is subjected to constant current charging, the selection unit outputs the total voltage value to the digital-to-analog conversion module; when the first battery is charged at constant voltage, the selection unit outputs a first reference voltage value to the digital-to-analog conversion module, wherein the first reference voltage value represents a voltage value required by the wireless earphone circuit when the first battery is charged at constant voltage.
Optionally, the adjusting module includes a first switch, an inductor and a capacitor connected in series between the second battery and the output terminal of the voltage adjusting unit, a second switch connected in parallel with the inductor and the capacitor, a first resistor and a second resistor connected in series between the output terminal of the digital-to-analog converting module and the output terminal of the voltage adjusting unit, a control circuit, and an error amplifier, a first output terminal of the control circuit is connected to the first switch for controlling the conduction and the closing of the first switch, a second output terminal of the control circuit is connected to the second switch for controlling the conduction and the closing of the second switch, a positive input terminal of the error amplifier is connected between the first resistor and the second resistor, and a negative input terminal of the error amplifier is connected to the second ground terminal between the inductor and the capacitor, the output end of the error amplifier is connected with the input end of the control circuit, wherein: when the first switch is closed, the second switch is switched off, and the inductor stores energy; when the first switch is switched off, the second switch is switched on, and the inductor releases energy, so that the output end of the voltage regulating unit outputs the second voltage; and/or, the digital-to-analog conversion module includes operational amplifier, connect the second voltage end with third resistance between the second earthing terminal and connect a plurality of series resistance between second voltage end and third voltage end, the third voltage end is digital-to-analog conversion module's output, every the last parallel connection of series resistance has control switch, digital-to-analog conversion module is including a plurality of inputs of receiving voltage numerical value, and is a plurality of the input is connected with a plurality of control switch one-to-one ground for it is corresponding to be used for control switch on and close, operational amplifier's output with the third voltage end is connected, operational amplifier's positive input end is connected with second reference voltage, operational amplifier's negative input end with the second voltage end is connected.
The utility model discloses the fourth aspect provides a storehouse of charging, including above-mentioned third aspect the storehouse circuit of charging.
The utility model discloses the fifth aspect provides a charging system, charging system includes above-mentioned first aspect wireless earphone circuit and above-mentioned third aspect the storehouse circuit that charges, wherein, wireless earphone circuit with one in the storehouse circuit that charges is including setting up unit and adder.
In the above technical solution, since the feedback unit of the wireless headset circuit can feed back the first voltage value of the first battery to the charging bin circuit, at this time, the charging bin circuit can set the voltage values of other elements connected to the first battery of the wireless headset, for example, set the voltage drop during charging of the voltage-dividing resistor, and the charging bin circuit can calculate the sum of the first voltage value and the set voltage drop value during charging of the voltage-dividing resistor as the voltage value required during charging of the wireless headset circuit, or the feedback unit of the wireless headset circuit can feed back a function value with the first voltage value of the first battery as a variable to the charging bin circuit, for example, the sum of the first voltage value of the first battery and the set voltage drop value during charging of the voltage-dividing resistor, so that the charging bin circuit can provide the charging voltage according to the voltage value required during charging of the wireless headset circuit, therefore, energy loss is reduced, charging efficiency is improved, the wireless earphone circuit does not need to be provided with a charging management circuit to carry out charging management such as constant-current charging or constant-voltage charging on the first battery, the circuit structure in the wireless earphone is simplified, and the size and the cost of the wireless earphone are reduced.
Other features and advantages of the present invention will be described in detail in the detailed description which follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a wireless headset charging circuit;
fig. 2 is a schematic structural diagram of a wireless headset circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a charging bin circuit according to a first embodiment of the present disclosure;
fig. 4 is a schematic circuit structure diagram of a voltage regulating unit of the charging bin circuit according to the embodiment of the present application;
fig. 5 is a schematic structural diagram of a charging bin circuit according to a second embodiment of the present application;
fig. 6 is a schematic structural diagram of a charging system according to a first embodiment of the present application;
fig. 7 is a schematic structural diagram of a charging system according to a second embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a wireless headset charging circuit. As shown in fig. 1, the wireless headset charging circuit is composed of the following two parts: a first partial circuit 10, as shown in a dashed box on the right in fig. 1, located in the wireless headset, including a first battery BAT1, at least one complete charge management unit, charge 1, and a setting unit Set; the second partial circuit 20, as shown in the left dashed box in fig. 1, is located in the charging bin, and includes a second battery BAT2, a charge management unit, charge 2, and a Boost unit, Boost. The charging management unit, Charger2, in the charging bin, realizes the function of constant current charging for the second battery BAT2, the Boost unit, Boost, is to Boost the voltage input by the second battery BAT2 to 5V and then output the voltage, namely, the voltage of VCHG is 5V voltage, the charging management unit, Charger1, in the wireless headset charges the first battery BAT1 through 5V voltage, the setting unit Set sets the charging management unit, Charger1, and the constant current charging current of the charging management unit, Charger1 can be Set. In the wireless headset shown in fig. 1, a radio frequency unit RF for picking up sound and an analog-to-digital conversion unit ADC for monitoring the amount of power may be integrated, but these units do not generally affect the charging of the first battery BAT 1.
Thus, when the voltage boosting unit Boost outputs a voltage of 5V and the voltage of the first battery BAT1 is low, the charging efficiency is low and the energy loss is large, for example, when the voltage of the first battery BAT1 is 3V, the efficiency is 3/5-60%. In addition, the circuit design in the wireless earphone is more complicated, the occupied space is larger, and the size and the cost of the wireless earphone are not favorably reduced.
In view of this, the embodiments of the present application provide a wireless headset and a circuit thereof, a charging chamber and a circuit thereof, a charging system and a method thereof, which can improve charging efficiency and reduce energy loss, and the circuit structure in the wireless headset is simple, thereby being beneficial to reducing the volume of the wireless headset and reducing cost.
Fig. 2 is a schematic structural diagram of a wireless headset circuit according to an embodiment of the present application. As shown in fig. 2, the wireless headset circuit includes a feedback unit F, a first battery BAT1 and a voltage dividing resistor R connected in series between a first ground terminal GND1 and a first voltage terminal VCHG, the first voltage terminal VCHG and the first ground terminal GND1 can be disconnectably connected to the charging bin circuit, the feedback unit F is configured to feed back a first voltage value of the first battery BAT1 to the charging bin circuit or feed back a function value with the first voltage value of the first battery BAT1 as a variable, so that the charging bin circuit can provide a charging voltage according to a sum of the first voltage value and a voltage drop of the voltage dividing resistor R during charging. The feedback unit F may have, but is not limited to, the following two cases:
first case
The feedback unit F includes an analog-to-digital converter ADC connected to the first battery BAT1, and the analog-to-digital converter ADC is configured to output a first voltage value of the first battery BAT 1. And, feedback unit F can adopt wired mode to the voltage value of feeding back to the storehouse circuit that charges. That is, the analog-to-digital converter ADC may be connected to the charge bin circuit during charging, so as to feed back the first voltage value to the charge bin circuit. Alternatively, the feedback unit F may feed back the voltage value to the charging bin circuit in a wireless manner. In particular, the feedback unit F may further comprise a first wireless communication unit, e.g. a first radio frequency unit RF1, connected to the analog-to-digital converter ADC, the first wireless communication unit being capable of communicating with a second wireless communication unit of the charge bin circuit for feeding back the first voltage value to the charge bin circuit.
Second case
As shown in fig. 2, the feedback unit F includes a setting unit Set, an Adder, and an analog-to-digital converter ADC connected to the first battery BAT1, where the analog-to-digital converter ADC is configured to output a first voltage value of the first battery BAT1, the setting unit Set is configured to Set a second voltage value, the second voltage value represents a voltage drop of the charging current across the voltage dividing resistor R, and the Adder is configured to calculate a sum of the first voltage value and the second voltage value. And, feedback unit F can adopt wired mode to the voltage value of feeding back to the storehouse circuit that charges. Namely, the Adder add is connected with the charging bin circuit during charging, so as to feed back the sum of the first voltage value and the second voltage value to the charging bin circuit. Alternatively, the feedback unit F may feed back the voltage value to the charging bin circuit in a wireless manner. In particular, the feedback unit F also comprises a first wireless communication unit, for example a first radio frequency unit RF1, connected to the Adder, which is able to communicate with a second wireless communication unit of the charging bin circuit to feed back to the charging bin circuit the voltage value calculated by the Adder.
In the above technical solution, since the feedback unit F of the wireless headset circuit can feed back the first voltage value of the first battery BAT1 to the charging bin circuit, at this time, the charging bin circuit can set a voltage drop when the voltage dividing resistor R is charged, and the charging bin circuit can calculate a sum of the first voltage value and a voltage drop value when the voltage dividing resistor R is charged as a voltage value required when the wireless headset circuit is charged, or the feedback unit F of the wireless headset circuit can feed back a function value with the first voltage value of the first battery BAT1 as a variable to the charging bin circuit, for example, a sum of the first voltage value of the first battery BAT1 and the voltage drop value when the set voltage dividing resistor R is charged enables the charging bin circuit to provide a charging voltage according to the voltage value required when the wireless headset circuit is charged, thereby reducing energy loss, improving charging efficiency, and the wireless headset circuit does not need to set the charging management circuit to charge the first battery BAT1, such as charging constant current Or constant voltage charging, thereby simplifying the circuit structure in the wireless earphone, being beneficial to reducing the volume of the wireless earphone and lowering the cost.
Additionally, the embodiment of the utility model provides a still provide a wireless earphone, this wireless earphone includes foretell wireless earphone circuit.
Fig. 3 is a schematic structural diagram of a charging bin circuit according to a first embodiment of the present disclosure. As shown in fig. 3, the charging bin circuit includes a voltage regulation unit Buck-Boost, a second battery BAT2, and a charging management unit charge connected to the second battery BAT2 for charging management of the second battery BAT2, an output end of the voltage regulation unit Buck-Boost and a second ground end GND2 can be disconnectably connected to the wireless headset circuit, and the voltage regulation unit Buck-Boost can regulate a first voltage input by the second battery BAT2 to a second voltage according to a total voltage value, and then output the second voltage to charge the first battery BAT1 of the wireless headset circuit, where the total voltage value is: the sum of a second voltage value set by the charging bin circuit and a first voltage value fed back by the wireless earphone circuit; or a function value fed back by the wireless headset circuit and taking the first voltage value as a variable, for example, the function value is the sum of the first voltage value and a voltage drop when a voltage dividing resistor R arranged in the wireless headset circuit is charged, and wherein: the absolute value of the second voltage is greater than or equal to the first voltage; or the absolute value of the second voltage is less than or equal to the first voltage.
Further, in order to simplify the wireless headset circuit, so as to reduce the size of the wireless headset and reduce the cost, the charging bin circuit may further include a setting unit Set and an Adder add (not shown in fig. 3, see fig. 2), where the setting unit Set is configured to Set a second voltage value, the second voltage value represents a voltage drop of the charging current across a voltage dividing resistor R of the wireless headset circuit, which is connected in series with the first battery BAT1, and the Adder add is capable of receiving the first voltage value of the first battery BAT1 fed back by the wireless headset circuit, so as to calculate a sum of the first voltage value and the second voltage value, and output the sum as a total voltage value to the voltage regulating unit Buck-Boost. And the Adder adapter can receive the first voltage value fed back by the wireless earphone circuit in a wired mode. Namely, the Adder adapter is connected with the wireless earphone circuit during charging so as to be used for receiving the first voltage value. Or, the Adder adapter may receive the first voltage value fed back by the wireless headset circuit in a wireless manner. Specifically, the charging bin circuit further comprises a second wireless communication unit, for example, a second radio frequency unit RF2, connected to the Adder adapter, the second wireless communication unit being capable of communicating with the first wireless communication unit of the wireless headset circuit, so that the Adder adapter receives the first voltage value fed back by the wireless headset circuit.
Or, in order to enable the charging bin circuit to adapt to the charging requirements of different wireless headset circuits, optionally, the voltage regulating unit Buck-Boost can receive a total voltage value fed back by the wireless headset circuit. And the Buck-Boost of the voltage regulation unit can receive the total voltage value fed back by the wireless earphone circuit in a wired mode. Namely, the Buck-Boost of the voltage regulation unit is connected with the wireless earphone circuit during charging so as to be used for receiving the total voltage value. Or the Buck-Boost of the voltage regulating unit can receive the total voltage value fed back by the wireless earphone circuit in a wireless mode. Specifically, as shown in fig. 3, the charging bin circuit further includes a second wireless communication unit, for example, a second radio frequency unit RF2, connected to the voltage regulation unit Buck-Boost, and the second wireless communication unit is capable of communicating with the first wireless communication unit of the wireless headset circuit, so that the voltage regulation unit Buck-Boost receives the total voltage value fed back by the wireless headset circuit.
Fig. 4 is a schematic circuit structure diagram of a voltage regulating unit of a charging bin circuit according to an embodiment of the present application. As shown in fig. 4, the voltage regulation unit Buck-Boost may include a digital-to-analog conversion module 1 and a regulation module 2 connected to the digital-to-analog conversion module 1, the digital-to-analog conversion module 1 may convert a received voltage value into an analog voltage signal and output the analog voltage signal to the regulation module, the regulation module 2 regulates a first voltage into a second voltage according to the analog voltage signal and outputs the second voltage, a voltage value received by the digital-to-analog conversion module 1 is equal to a value of the second voltage, and a voltage value received by the digital-to-analog conversion module 1 is a total voltage value.
Fig. 5 is a schematic structural diagram of a charging bin circuit according to a second embodiment of the present application. As shown in fig. 3 and 5, on the basis of the charge bin circuit of the first embodiment shown in fig. 3, the charge bin circuit of the second embodiment shown in fig. 5 further includes a selecting unit Min receiving a total voltage value, and when the first battery BAT1 is subjected to constant current charging, the selecting unit Min outputs the total voltage value to the digital-to-analog conversion module 1; when the first battery is charged at a constant voltage, the selection unit Min outputs a first reference voltage value VDRef1 to the digital-to-analog conversion module 1, where the first reference voltage value VDRef1 represents a voltage value required by the wireless headset circuit when the first battery BAT1 is charged at a constant voltage.
With continued reference to fig. 4, the regulating module 2 includes a first switch K1, an inductor L1 and a capacitor C1 connected in series between the second battery BAT2 and the output terminal VO of the voltage regulating unit Buck-Boost, a second switch K2 connected in parallel with the inductor L1 and the capacitor C1, a first resistor R1 and a second resistor R2 connected in series between the output terminal of the digital-to-analog converting module 1 and the output terminal VO of the voltage regulating unit Buck-Boost, a control circuit and an error amplifier EA, a first output terminal of the control circuit is connected to the first switch K1 for controlling the conduction and closing of the first switch K1, a second output terminal of the control circuit is connected to the second switch K2 for controlling the conduction and closing of the second switch K2, a positive input terminal of the error amplifier EA is connected to a second ground terminal GND R1 and the second resistor R2, a negative input terminal of the error amplifier EA is connected to a second ground terminal 2 between the inductor L1 and the capacitor C1, the output end of the error amplifier EA is connected with the input end of the control circuit, wherein: when the first switch K1 is closed, the second switch K2 is switched off, and the inductor L1 stores energy; when the first switch K1 is turned off, the second switch K2 is turned on, and the inductor L1 releases energy, so that the output terminal VO of the Buck-Boost of the voltage regulating unit outputs a second voltage.
The digital-to-analog conversion module 1 includes an operational amplifier OP, a third resistor R3 connected between the second voltage terminal V2 and the second ground terminal GND2, and a plurality of series resistors R4, R5, R6, R7 connected between the second voltage terminal V2 and the third voltage terminal V1, the third voltage terminal V1 is an output terminal of the digital-to-analog conversion module 1, each of the series resistors R4, R5, R6, R7 is connected in parallel with a control switch KA, KB, KC, the digital-to-analog conversion module 1 includes a plurality of input terminals for receiving voltage values, the plurality of input terminals are connected with the plurality of control switches KA, KB, KC in a one-to-one correspondence manner for controlling the turn-on and turn-off of the corresponding control switches, an OP output terminal of the operational amplifier is connected with the third voltage terminal V1, a positive input terminal of the operational amplifier OP is connected with the second reference voltage 2, and a negative input terminal of the operational amplifier VRef is connected with the third voltage terminal V1.
Additionally, the embodiment of the utility model provides a still provide a storehouse of charging, including foretell storehouse circuit of charging.
Fig. 6 is a schematic structural diagram of a charging system according to a first embodiment of the present application. As shown in fig. 6, the wireless headset charging circuit includes a first sub-circuit 100 disposed in the wireless headset and a second sub-circuit 200 disposed in the charging chamber. The first partial circuit 100 includes an analog-to-digital converter ADC, and a first battery BAT1 and a voltage dividing resistor R connected in series between a first ground terminal GND1 and a first voltage terminal VCHG, where the analog-to-digital converter ADC is connected to the first battery BAT1 for outputting a first voltage value of the first battery BAT 1. The second partial circuit 200 includes a voltage regulation unit Buck-Boost, a second battery BAT2, and a charge management unit charge connected to the second battery BAT2 for performing charge management on the second battery BAT2, one of an output terminal VO of the voltage regulation unit Buck-Boost and a second ground terminal GND2 is connected to the first ground terminal GND1, and the other of the output terminal VO of the voltage regulation unit Buck-Boost and the second ground terminal GND2 is connected to the first voltage terminal VCHG. The wireless headset charging circuit further comprises a setting unit Set and an Adder Adder which are arranged in the wireless headset or the charging bin, wherein the setting unit Set is used for setting a second voltage value, the second voltage value represents a voltage value applied to a voltage dividing resistor R when the first battery BAT1 is subjected to constant current charging, namely, the voltage drop of charging current on the voltage dividing resistor R, the Adder Adder is used for calculating the sum of the first voltage value and the second voltage value, and the voltage regulating unit Buck-Boost is used for regulating the first voltage input from the second battery BAT2 into a second voltage according to the voltage value calculated by the Adder Adder and then outputting the second voltage to charge the first battery BAT 1.
The voltage dividing resistor R may be disposed outside the chip, such as a resistor mounted on a printed circuit board, or may be integrated inside the chip, for example, implemented by a metal resistor or a polysilicon resistor. The circuit of the setting unit Set may be formed by digital circuit design, for example, by verilog language design synthesis, and may include some registers for storing the resistance value of the voltage dividing resistor R, the charging current value, and the like, and performing simple operations. For example, the resistance value of the voltage dividing resistor R is multiplied by the charging current value and then output to the Adder. In some designs, the resistance value of the voltage-dividing resistor R can be rewritten by software, and the charging current value can also be designed to be rewritten by software.
In addition, the first voltage terminal VCHG is connected to the positive electrode of the first battery BAT1, and the first ground terminal GND1 is connected to the negative electrode of the first battery BAT 1. The second voltage output by the output terminal of the voltage regulating unit may be a positive voltage, and at this time, the output terminal of the voltage regulating unit is connected to the first voltage terminal VCHG, and the second ground terminal GND2 is connected to the first ground terminal GND 1. However, in order to simplify the circuit structure and reduce the cost, the second voltage output by the output terminal VO of the voltage regulating unit may be a negative voltage, the output terminal VO of the voltage regulating unit is connected to the first ground terminal GND1, and the second ground terminal GND2 is connected to the first voltage terminal VCHG. In addition, in both cases where the second voltage output by the output terminal VO of the voltage regulating unit is a negative voltage or a positive voltage, the absolute value of the second voltage may be equal to or greater than the first voltage or the absolute value of the second voltage may be equal to or less than the first voltage. That is, the voltage regulating unit may be a Buck-Boost circuit, and may output a voltage input from the second battery BAT2 after being adjusted up or down to charge the first battery BAT 1.
Since the first partial circuit 100 provided in the wireless headset includes the analog-to-digital converter ADC and the first battery BAT1 and the voltage dividing resistor R connected in series between the first ground terminal GND1 and the first voltage terminal VCHG, the analog-to-digital converter ADC can output the first voltage value of the first battery BAT1, the setting unit Set can Set the second voltage value representing the voltage value applied to the voltage dividing resistor R when the first battery BAT1 is subjected to constant current charging, the Adder can calculate the sum of the first voltage value and the second voltage value, the voltage adjusting unit Buck-Boost can adjust the first voltage input from the second battery BAT2 to the second voltage according to the voltage value calculated by the Adder and output the second voltage value to charge the first battery BAT1, that is, when the wireless headset is charged, the second partial circuit 200 in the charging chamber can output the charging voltage required by the first partial circuit 100 in the wireless headset according to the voltage value calculated by the Adder, therefore, the energy loss is reduced, the charging efficiency is improved, and the circuit structure in the wireless earphone is simple, so that the size and the cost of the wireless earphone are reduced.
When the setting unit Set and the Adder adapter are located in the wireless headset and the wireless headset is charged by using the charging bin, the voltage regulating unit Buck-Boost can be in wired connection with the Adder adapter, so that the first voltage input from the second battery BAT2 is regulated to be the second voltage according to the voltage value calculated by the Adder adapter and then output. Alternatively, the wireless headset charging circuit may further include a first wireless communication unit disposed within the wireless headset and a second wireless communication unit disposed within the charging bin. And, the wireless communication mode between the first wireless communication unit and the second wireless communication unit may be one of radio frequency, bluetooth, WiFi and ZigBee. As shown in fig. 6, the Adder ad is connected to a first wireless communication unit, for example, a radio frequency unit RF1, and the voltage adjusting unit Buck-Boost is connected to a second wireless communication unit, for example, a radio frequency unit RF2, to receive the voltage value calculated by the Adder ad through wireless communication between the first wireless communication unit and the second wireless communication unit.
Fig. 7 is a schematic structural diagram of a charging system according to a second embodiment of the present application. As shown in fig. 7, in order to realize constant-current or constant-voltage charging of the first battery BAT1, the wireless headset charging circuit may further include a selection unit Min. If the voltage value calculated by the Adder adapter is smaller than the first reference voltage value VDRef1, the selection unit Min outputs the voltage value calculated by the Adder adapter, and at this time, the first battery BAT1 is subjected to constant-current charging, wherein the first reference voltage value VDRef1 represents the voltage-dividing resistor R and the charging voltage value required by the first battery BAT1 when the first battery BAT1 is subjected to constant-voltage charging; if the voltage value calculated by the Adder is greater than the first reference voltage value VDRef1, the selection unit Min outputs the first reference voltage value VDRef1, and at this time, the first battery BAT1 is charged at a constant voltage.
With continued reference to FIG. 7, VDRef1[2:0] has the same number of bits as VDRF2[2:0], both of which are three-bit digital signals. VDRef1[2:0] represents the constant voltage value of the constant voltage charge, e.g., 4.2V. When VDRF2[2:0] is larger than VDRef1[2:0], the selection unit Min selects the value of VDRef1[2:0] to be output to VD [2:0] for controlling the output voltage of Buck-Boost; when VDRF2[2:0] is smaller than VDRef1[2:0], the selection unit Min selects the value of VDRF2[2:0] to output to VD [2:0] to control the output voltage of Buck-Boost.
Therefore, the embodiment of the present invention provides a charging system including the above wireless earphone circuit and the above charging chamber circuit, wherein one of the wireless earphone circuit and the charging chamber circuit includes the setting unit Set and the Adder adapter.
Additionally, the embodiment of the utility model provides a still provide a charging method, this charging method includes: measuring a total voltage value required for charging a first battery of the wireless headset circuit; after the first voltage output by the second battery of the charging bin circuit is adjusted to be the second voltage according to the total voltage value, the second voltage is output to the wireless earphone circuit to charge the first battery, wherein the value of the second voltage is equal to the total voltage value; the absolute value of the second voltage is greater than or equal to the first voltage; or the absolute value of the second voltage is less than or equal to the first voltage.
The wireless headset charging circuit according to the embodiment of the present application is further described with reference to fig. 4 and 7. The first wireless communication unit is a radio frequency unit RF1, the second wireless communication unit is a radio frequency unit RF2, and the voltage regulation unit is a Buck-Boost circuit.
As shown in fig. 7, the circuit in the left dashed box is the second partial circuit 200 located in the charging chamber, and the circuit in the right dashed box is the first partial circuit 100 located in the wireless headset. The second sub-circuit 200 may include a charge management unit charge, a radio frequency unit RF2, a voltage regulation unit Buck-Boost circuit (Buck-Boost circuit), a second battery BAT2, and a selection unit Min. The charge management unit, charge, functions to charge the second battery BAT2, and the Buck-Boost circuit functions to generate an appropriate output voltage according to the instruction of the RF unit RF 2. Since the command of the radio frequency unit RF2 expects that the voltage output from the voltage regulating unit may be higher than the voltage of the second battery BAT2 and may also be lower than the voltage of the BAT2, a buck-boost circuit is required. The Buck-Boost circuit operates in a Boost mode when the desired output voltage is higher than the voltage of second battery BAT2, and operates in a Buck mode when the desired output voltage is lower than the voltage of second battery BAT 2. In the wireless earphone, the divider resistor R is a fixed resistor, the resistance value of which is expected to be a fixed value, the first battery BAT1 is a battery in the wireless earphone, the analog-to-digital converter ADC is used for converting the voltage of the first battery BAT1 into a digital signal representing the voltage value of the first battery BAT1, the setting unit Set is used for generating a voltage value according to the Set constant current charging current value and outputting the voltage value as the digital signal, and the voltage value output by the setting unit Set represents the voltage required on the divider resistor R, which is equal to the charging current value of the first battery BAT1 multiplied by the resistance of the divider resistor R. The Adder outputs a voltage value obtained by adding the voltage value output by the analog-to-digital converter ADC to the voltage value generated by the setting unit Set to the radio frequency unit RF 1. In a wireless headset, the RF unit RF1 generally follows the bluetooth protocol, but may in principle also be other wireless communication protocols, such as Wifi or Zigbee. The RF unit RF1 is typically a radio frequency receiver that can either transmit or receive wireless signals. The radio frequency unit RF1 may operate on a frequency modulation principle or on an amplitude modulation principle. The RF unit RF1 may perform wireless communication with the RF unit RF2, and transmit a digital signal of the voltage value received from the Adder adapter to the RF unit RF2, and the RF unit RF2 outputs the voltage value calculated by the Adder adapter or a first reference voltage value VDRef1 to the Buck-Boost circuit Buck-Boost through the selection unit Min, where the first reference voltage value VDRef1 represents a voltage-dividing resistor R and a charging voltage value required by the first battery BAT1 when the first battery BAT1 is charged at a constant voltage. The Buck-Boost circuit Buck-Boost outputs a corresponding voltage according to the voltage value input by the selection unit Min, and the output voltage is applied between the first voltage terminal VCHG and the first ground terminal GND1, where the Buck-Boost circuit Buck-Boost preferably outputs a negative voltage, i.e., VO is negative with respect to ground, so that the output terminal VO of the Buck-Boost circuit Buck-Boost is connected to the first ground terminal GND1 of the first circuit part 100 in the wireless headset, and the second ground terminal GND2 of the second circuit part 200 of the charging chamber is connected to the first voltage terminal VCHG of the first circuit part 100.
Referring to fig. 4, an implementation of a Buck-Boost circuit Buck-Boost of the present application is described. The Buck-Boost circuit Buck-Boost comprises an operational amplifier OP, an error amplifier EA, resistors R1, R2, R3, R4, R5, R6 and R7, a control circuit, an inductor L1, a capacitor C1 and switches K1 and K2. K1 and K2 are switched on alternately when in work, namely K2 is switched off when K1 is switched on; when K1 is off, K2 is on. Assuming that the duty ratio of the conduction of K1 is D, the duty ratio of the conduction of K2 is 1-D, and the following can be known from the conservation of magnetic flux:
VIN · D + (1-D) VOUT ═ 0 (i.e., the sum of the magnetic flux when energy is stored in the K1 conduction inductor L1 and the magnetic flux when energy is released in the K2 conduction inductor L1 is zero)
Where VIN is a voltage value input to the first voltage terminal VCHG, VOUT is an output voltage value of the output terminal VO of the Buck-Boost circuit Buck-Boost, and D is a duty ratio at which the switch K1 is turned on.
The above equation is collated to obtain: VOUT is-VIN.D/(1-D).
When D > 50%, D/(1-D) is greater than 1, VOUT is in boost mode, and the absolute value of the output voltage is greater than the absolute value of the input voltage. When D < 50%, D/(1-D) is less than 1, VOUT is in step-down mode, and the absolute value of the output voltage is less than that of the input voltage.
With continued reference to fig. 4, when the voltage at the FB node is greater than the voltage at the second ground GND2, the output voltage of the error amplifier EA increases, so that the control circuit increases the duty ratio D1 of the switch signal SW1 output by the control circuit, and SW2 is an inverted signal of SW1, so that the voltage at the output terminal VO of the Buck-Boost circuit falls, resulting in the voltage at FB also falling. When the voltage of the FB node is less than the voltage of the second ground GND2, the output voltage of the error amplifier EA decreases, so that the control circuit decreases the duty ratio D1 of the switch signal SW1 outputted by the control circuit, and SW2 is an inverted signal of SW1, so that the voltage of the output terminal VO of the Buck-Boost circuit Buck-Boost increases, resulting in the voltage of FB also increasing.
Therefore, the control circuit in the Buck-Boost is a negative feedback circuit, and when the gain is sufficient, the FB voltage should be equal to the voltage of the second ground GND2 in the steady state. Therefore, in a steady state, the following are satisfied: VO-R2. V1/R1.
Wherein, R1 is the resistance of the first resistor R1 in fig. 4, R2 is the resistance of the second resistor R2 in fig. 4, and V1 is the voltage value of the third voltage terminal V1 in fig. 4.
The voltage at the third voltage terminal V1 is generated by the operational amplifier OP, the resistors R3-R7 and the switches KA-KC. Which satisfies the following conditions: V1/(Req + R3) ═ V2/R3, and VRef2 ═ V2, then V1 ═ Req + R3) VRef 2/R3.
Wherein Req is an equivalent resistance value of all resistors (determined by the on and off states of R4 to R7 and switches KA to KC) connected in series between the third voltage terminal V1 and the second voltage terminal V2, R3 is a resistance value of the third resistor R3, and the second reference voltage VRef2 is a voltage value of the second voltage terminal V2. Therefore, the resistance value of Req can be changed by controlling the on or off of the switch through the VD 0-VD 2 signals, so that the voltage value of V1 is set. The implementation modes are three-bit digital signals of VD0, VD1 and VD2, and in practical design, the implementation modes can be digital signals with more bits.
To sum up, the utility model discloses for prior art have following advantage: firstly, the circuit structure in the wireless earphone is simple in design, so that the space occupied by the charging circuit is smaller, the size and the weight of the wireless earphone are reduced, the wireless earphone is convenient to wear, and the cost is lower; second, the energy efficiency in charging is higher for the entire system. Specifically, in the charging circuit shown in fig. 1, when the output voltage of the boosting unit Boost is 5V and the battery voltage is low, for example, the battery voltage is 3V, the efficiency is 3/5-60%, and the charging efficiency is low. In the charging system provided by the embodiment of the present application shown in fig. 6 and 7, the first partial circuit 100 disposed in the wireless headset is connected in series with a voltage dividing resistor R, and the voltage drop across the voltage dividing resistor R can be designed to be as small as possible, thereby improving the energy utilization efficiency of the system. For example, the resistance value of the voltage dividing resistor R is designed to be 1 ohm, the voltage drop across the voltage dividing resistor R is 0.1V when the charging current is 0.1A, the voltage output by the Buck-Boost is-3.1V when the voltage of the first battery BAT1 is 3V, and the voltage applied between the first voltage terminal VCHG and the first ground terminal GND1 is 3.1V, so that the system efficiency is 3/3.1-96.8%. Further, according to the utility model discloses a principle if reduce series resistance R's resistance value, can further raise the efficiency. For example, when the resistance of the series resistor R is 0.2 ohm, if the voltage of the first battery BAT1 is 3V and the charging current is 0.1A, the charging circuit of the embodiment of the present invention can control the output voltage of the Buck-Boost to be 3+0.1 × 0.2 ═ 3.02V, and the system efficiency is 3/3.02 ═ 99.3%. In addition, after the energy utilization efficiency is improved, the number of times of charging the wireless earphone by the full-filled charging bin can be increased, and therefore the using effect of a user is improved.
Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (11)
1. The wireless earphone circuit is characterized by comprising a feedback unit, a first battery and a divider resistor, wherein the first battery and the divider resistor are connected between a first grounding end and a first voltage end in series, the first voltage end and the first grounding end can be disconnectably connected with a charging bin circuit, and the feedback unit is used for feeding back a first voltage value of the first battery or feeding back a function value taking the first voltage value of the first battery as a variable to the charging bin circuit, so that the charging bin circuit can provide charging voltage according to the sum of the first voltage value and the set voltage drop of the divider resistor during charging.
2. The wireless headset circuit of claim 1, wherein the feedback unit comprises an analog-to-digital converter coupled to the first battery, the analog-to-digital converter configured to output the first voltage value of the first battery, wherein:
the analog-to-digital converter is connected with the charging bin circuit during charging so as to feed back the first voltage value to the charging bin circuit; or the like, or, alternatively,
the feedback unit further comprises a first wireless communication unit connected with the analog-to-digital converter, and the first wireless communication unit can communicate with a second wireless communication unit of the charging bin circuit to feed back the first voltage value to the charging bin circuit.
3. The wireless headset circuit according to claim 1, wherein the feedback unit comprises a setting unit, an adder and an analog-to-digital converter connected to the first battery, the analog-to-digital converter is configured to output the first voltage value of the first battery, the setting unit is configured to set a second voltage value, the second voltage value represents a voltage drop of a charging current across the voltage divider resistor, the adder is configured to calculate a sum of the first voltage value and the second voltage value, wherein:
the adder is connected with the charging bin circuit during charging and is used for feeding back the sum of the first voltage value and the second voltage value to the charging bin circuit; or the like, or, alternatively,
the feedback unit further comprises a first wireless communication unit connected with the adder, and the first wireless communication unit can communicate with a second wireless communication unit of the charging bin circuit to feed back the voltage value calculated by the adder to the charging bin circuit.
4. A wireless headset characterized by comprising a wireless headset circuit according to any of claims 1-3.
5. The utility model provides a charging bin circuit, its characterized in that, including voltage regulation unit, second battery and with the second battery link to each other in order being used for right the second battery carries out charge management's charge management unit, voltage regulation unit's output and second earthing terminal can be connected with wireless earphone circuit disconnectably, just voltage regulation unit can be according to total voltage numerical value, will the first voltage regulation of second battery input exports after being the second voltage, in order to right wireless earphone circuit's first battery charges, total voltage numerical value is: the sum of a second voltage value set by the charging bin circuit and a first voltage value fed back by the wireless earphone circuit; or, the wireless earphone circuit feeds back a function value with the first voltage value as a variable; and wherein: the absolute value of the second voltage is greater than or equal to the first voltage; or the absolute value of the second voltage is less than or equal to the first voltage.
6. The charging bin circuit of claim 5, further comprising a setting unit and an adder, wherein the setting unit is configured to set the second voltage value, the second voltage value represents a voltage drop of a charging current across a voltage dividing resistor of the wireless headset circuit connected in series with the first battery, and the adder is capable of receiving the first voltage value of the first battery fed back by the wireless headset circuit to calculate a sum of the first voltage value and the second voltage value as the total voltage value to be output to the voltage regulating unit, wherein:
the adder is connected with the wireless earphone circuit during charging so as to be used for receiving the first voltage value; or the like, or, alternatively,
the charging bin circuit further comprises a second wireless communication unit connected with the adder, and the second wireless communication unit can communicate with the first wireless communication unit of the wireless earphone circuit, so that the adder receives the first voltage value fed back by the wireless earphone circuit.
7. The charging bin circuit of claim 5, wherein the voltage regulation unit is capable of receiving the total voltage value fed back by the wireless headset circuit, wherein:
the voltage adjusting unit is connected with the wireless earphone circuit during charging so as to be used for receiving the total voltage value; or the like, or, alternatively,
the charging bin circuit further comprises a second wireless communication unit connected with the voltage adjusting unit, and the second wireless communication unit can communicate with the first wireless communication unit of the wireless earphone circuit, so that the voltage adjusting unit receives the total voltage value fed back by the wireless earphone circuit.
8. The charging bin circuit according to claim 6 or 7, wherein the voltage adjusting unit comprises a digital-to-analog conversion module and an adjusting module connected to the digital-to-analog conversion module, the digital-to-analog conversion module is capable of converting a received voltage value into an analog voltage signal and outputting the analog voltage signal to the adjusting module, the adjusting module adjusts the first voltage into the second voltage according to the analog voltage signal and outputs the second voltage, and the digital-to-analog conversion module receives a voltage value equal to the second voltage value, wherein:
the voltage value received by the digital-to-analog conversion module is the total voltage value; or the like, or, alternatively,
the charging bin circuit further comprises a selection unit for receiving the total voltage value, and when the first battery is subjected to constant current charging, the selection unit outputs the total voltage value to the digital-to-analog conversion module; when the first battery is charged at constant voltage, the selection unit outputs a first reference voltage value to the digital-to-analog conversion module, wherein the first reference voltage value represents a voltage value required by the wireless earphone circuit when the first battery is charged at constant voltage.
9. The charging bin circuit of claim 8, wherein the regulating module comprises a first switch, an inductor and a capacitor connected in series between the second battery and the output terminal of the voltage regulating unit, and a second switch connected in parallel with the inductor and the capacitor, a first resistor and a second resistor connected in series between the output terminal of the digital-to-analog conversion module and the output terminal of the voltage regulating unit, a control circuit and an error amplifier, wherein a first output terminal of the control circuit is connected with the first switch for controlling the conduction and the closing of the first switch, a second output terminal of the control circuit is connected with the second switch for controlling the conduction and the closing of the second switch, a positive input terminal of the error amplifier is connected between the first resistor and the second resistor, and a negative input terminal of the error amplifier is connected to the second ground terminal between the inductor and the capacitor, the output end of the error amplifier is connected with the input end of the control circuit, wherein: when the first switch is closed, the second switch is switched off, and the inductor stores energy; when the first switch is switched off, the second switch is switched on, and the inductor releases energy, so that the output end of the voltage regulating unit outputs the second voltage; and/or the presence of a gas in the gas,
the digital-to-analog conversion module comprises an operational amplifier, a third resistor connected between a second voltage end and a second grounding end and a plurality of series resistors connected between the second voltage end and the third voltage end, wherein the third voltage end is an output end of the digital-to-analog conversion module, each series resistor is connected with a control switch in parallel, the digital-to-analog conversion module comprises a plurality of input ends for receiving voltage values, the input ends are connected with the control switches in a one-to-one correspondence mode and used for controlling the on and off of the control switches correspondingly, the output end of the operational amplifier is connected with the third voltage end, the positive input end of the operational amplifier is connected with a second reference voltage, and the negative input end of the operational amplifier is connected with the second voltage end.
10. A charging magazine comprising a charging magazine circuit according to any of claims 5-9.
11. A charging system comprising the wireless headset circuit of any one of claims 1-3 and the charging bin circuit of any one of claims 5-9, wherein one of the wireless headset circuit and the charging bin circuit comprises a setup unit and an adder.
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| CN202021039355.9U CN212343362U (en) | 2020-06-09 | 2020-06-09 | Wireless earphone and circuit thereof, charging bin and circuit thereof, and charging system |
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| CN202021039355.9U CN212343362U (en) | 2020-06-09 | 2020-06-09 | Wireless earphone and circuit thereof, charging bin and circuit thereof, and charging system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111600357A (en) * | 2020-06-09 | 2020-08-28 | 无锡中感微电子股份有限公司 | Wireless earphone and circuit thereof, charging bin and circuit thereof, and charging system and method |
| WO2022236474A1 (en) * | 2021-05-08 | 2022-11-17 | Harman International Industries, Incorporated | Charging device for wearable device and wearable device assembly |
-
2020
- 2020-06-09 CN CN202021039355.9U patent/CN212343362U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111600357A (en) * | 2020-06-09 | 2020-08-28 | 无锡中感微电子股份有限公司 | Wireless earphone and circuit thereof, charging bin and circuit thereof, and charging system and method |
| WO2022236474A1 (en) * | 2021-05-08 | 2022-11-17 | Harman International Industries, Incorporated | Charging device for wearable device and wearable device assembly |
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