CN111740460B - Earphone charging control circuit and charging box - Google Patents
Earphone charging control circuit and charging box Download PDFInfo
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- CN111740460B CN111740460B CN202010594079.0A CN202010594079A CN111740460B CN 111740460 B CN111740460 B CN 111740460B CN 202010594079 A CN202010594079 A CN 202010594079A CN 111740460 B CN111740460 B CN 111740460B
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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
- H02J7/007—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
- H02J7/007186—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage obtained with the battery disconnected from the charge or discharge circuit
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1025—Accumulators or arrangements for charging
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- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses an earphone charging control circuit and a charging box, wherein the earphone charging control circuit comprises: the input end of the battery charging circuit is connected with an external power supply; the voltage detection control circuit is connected with the output end of the battery charging circuit and is configured to detect a voltage value output by the battery charging circuit, output a first control signal when the detected voltage value is greater than a first preset voltage threshold value and output a second control signal when the detected voltage value is less than a second preset voltage threshold value; the first preset voltage threshold is greater than the second preset voltage threshold; the earphone charging circuit is connected with the output end of the battery charging circuit, and the earphone charging circuit is configured to convert the power supply of the electric energy output by the battery charging circuit and output the electric energy to the wireless earphone when receiving the first control signal so as to charge the wireless earphone until receiving the second control signal. The invention improves the charging efficiency of the wireless earphone and the charging box.
Description
Technical Field
The invention relates to the technical field of wireless earphones, in particular to an earphone charging control circuit and a charging box.
Background
With the rapid development of earphone technology, wireless earphones, especially bluetooth earphones, are more and more widely used, and wireless earphones are usually charged through a charging box, that is, an earphone box. Currently, the charging box can implement combined charging. However, in the process of the combined charging, the voltage at the two ends of the battery fluctuates, which will cause the charging box to continuously open and close the charging path for the earphone, and the earphone continuously jumps between the charging state and the non-charging state, so that the combined charging efficiency is reduced, and the service lives of the earphone battery and the battery of the charging box are also reduced.
Disclosure of Invention
The invention mainly aims to provide an earphone charging control circuit and a charging box, and aims to improve the charging efficiency of a wireless earphone and the charging box.
In order to achieve the above object, the present invention provides an earphone charging control circuit, which includes:
the input end of the battery charging circuit is connected with an external power supply;
the voltage detection control circuit is connected with the output end of the battery charging circuit and is configured to detect a voltage value output by the battery charging circuit, output a first control signal when the detected voltage value is larger than a first preset voltage threshold value and output a second control signal when the detected voltage value is smaller than a second preset voltage threshold value; wherein the first preset voltage threshold is greater than the second preset voltage threshold;
the earphone charging circuit is connected with the output end of the battery charging circuit, and is configured to perform power conversion on electric energy output by the battery charging circuit and output the electric energy to a wireless earphone when the first control signal is received, so that the wireless earphone is charged until the second control signal is received.
Optionally, the voltage detection control circuit includes a sampling resistor and a hysteresis comparator, a first end of the sampling resistor is connected to the output end of the battery charging circuit, a second end of the sampling resistor is connected to the input end of the hysteresis comparator, and an output end of the hysteresis comparator is connected to the controlled end of the earphone charging circuit.
Optionally, the voltage detection control circuit includes a pull-up resistor, a first end of the pull-up resistor is connected to the output end of the battery charging circuit, and a second end of the pull-up resistor is connected to the controlled end of the earphone charging circuit.
Optionally, the voltage detection control circuit includes a sampling resistor and a main controller, a first end of the sampling resistor is connected with an output end of the battery charging circuit, a second end of the sampling resistor is connected with a signal feedback end of the main controller, and a control end of the main controller is connected with a controlled end of the earphone charging circuit.
Optionally, the headset charging control circuit further comprises a battery;
the battery charging circuit comprises a charging chip and a current setting resistor, the input end of the charging chip is the input end of the battery charging circuit, and the output end of the charging chip is connected with the battery and the earphone charging circuit through a direct current bus respectively.
Optionally, the battery charging circuit further includes a current setting resistor, one end of the current setting resistor is grounded, and the other end of the current setting resistor is connected to the current setting end of the charging chip.
Optionally, the earphone charging circuit includes a boost chip, an inductor and a filter capacitor, an input end of the boost chip is connected to the battery charging circuit, and an output end of the boost chip is connected to the wireless earphone; the enabling end of the boosting chip is connected with the control end of the voltage detection control circuit; the switch end of the boosting chip is connected with the power input end through an inductor; the filter capacitor is connected with the boost chip.
Optionally, the earphone charging control circuit further includes a USB interface circuit, an input end of the USB interface circuit is connected to an external power source, and an output end of the USB interface circuit is connected to an input end of the battery charging circuit.
Optionally, the earphone charging control circuit further includes an earphone interface circuit, an input end of the earphone interface circuit is connected to the earphone charging circuit, and an output end of the earphone interface circuit is used for accessing the wireless earphone.
The invention also provides a charging box which comprises the earphone charging control circuit.
The earphone charging control circuit is provided with a battery charging circuit to be connected with an external power supply and charge a battery, a voltage value output by the battery charging circuit is detected by a voltage detection control circuit, a first control signal is output when the detected voltage value is larger than a first preset voltage threshold value, the earphone charging circuit is controlled to perform power conversion on electric energy output by the battery charging circuit and then output the electric energy to a wireless earphone to charge the wireless earphone, and a second control signal is output when the detected voltage value is smaller than a second preset voltage threshold value, so that the earphone charging circuit is controlled to stop charging the wireless earphone. The earphone charging control circuit can maintain the charging voltage of the wireless earphone even if the voltage value output by the battery charging circuit and the battery falls when the battery voltage is pulled down and falls at the moment of connecting the charging path of the wireless earphone, thereby solving the problems that the charging path of the wireless earphone is closed due to the fact that the voltage value output by the battery charging circuit and the battery falls triggers a turn-off mechanism, the battery voltage of a charging box rises and triggers a turn-on mechanism for charging the earphone, the joint charging efficiency is reduced and the charging box and the wireless earphone are even damaged in severe cases due to the fact that the charging path of the charging box is continuously turned on and off due to circulation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic diagram of functional modules of an embodiment of a charging control circuit of an earphone according to the present invention;
fig. 2 is a schematic diagram of functional modules of another embodiment of the charging control circuit of the earphone according to the present invention;
fig. 3 is a circuit diagram of an embodiment of a charging control circuit for an earphone according to the present invention.
The reference numbers illustrate:
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The invention provides an earphone charging control circuit, which is applied to a charging box with a function of charging a wireless earphone.
With the rapid development of earphone technology, Wireless earphones, especially bluetooth earphones, are more and more widely used, a TWS (True Wireless Stereo) earphone which appears recently is a typical product with a good combination of intelligentization and Wireless trends in Wireless earphones, the Wireless earphones already have a certain occupancy rate in the earphone market by virtue of wearing freedom and good tone quality, the Wireless earphones are used more and more frequently in various occasions, and the single use time is longer and longer. In addition, in the actual use process, people often establish a communication link between the wireless earphone and the intelligent charging box, such as a mobile phone and an intelligent watch, play voice, such as a call or a music lamp, by using the wireless earphone, collect the voice of a user, and output the voice to the intelligent charging box through the wireless communication module arranged in the wireless earphone. Although the wireless earphone is small and convenient, the wireless earphone has stronger storage battery capacity than the traditional neck hanging type and head-wearing type Bluetooth earphones, and Bluetooth transmission between two ears cannot be avoided to be a power consumption point. The wireless headset is usually provided with a self-contained power supply, such as a storage battery, but the self-contained power supply generally has limited capacity, so that a headset charging device is usually required to charge the wireless headset. The earphone charging device is mostly set to be in a charging box shape, and the wireless earphone can be stored in the charging box when not used, so that the wireless earphone is prevented from being lost. The charging box can communicate with the earphone, and functions of forced pairing of the wireless earphone, action of the switch box, OTA upgrading and the like are achieved.
At present, the charging box can realize combined charging, namely, under the condition that an external power adapter is connected, a battery of the charging box is charged, and meanwhile, the wireless earphone is also charged. When the voltage at the two ends of the battery reaches the charging voltage of the wireless earphone, the wireless earphone is started to be charged, and when the voltage is lower than the charging voltage of the wireless earphone, the wireless earphone is stopped to be charged. However, in the process of combined charging, the voltage at the two ends of the battery fluctuates, which will cause the charging box to continuously open and close the charging path for the earphone, and the earphone continuously jumps between the charging state and the non-charging state, so that the combined charging efficiency is reduced, the combined charging duration is greatly increased, and the service lives of the earphone battery and the charging box battery are reduced.
In order to solve the above problem, referring to fig. 1, in an embodiment of the present invention, the earphone charging control circuit includes:
the battery charging circuit 10, the input end VBUS of the battery charging circuit 10 is connected with an external power supply;
a voltage detection control circuit 20 connected to an output terminal of the battery charging circuit 10, wherein the voltage detection control circuit 20 is configured to detect a voltage value output by the battery charging circuit 10, output a first control signal when the detected voltage value is greater than a first preset voltage threshold, and output a second control signal when the detected voltage value is less than a second preset voltage threshold; wherein the first preset voltage threshold is greater than the second preset voltage threshold;
the earphone charging circuit 30 is connected with the output end of the battery charging circuit 10, and the earphone charging circuit 30 is configured to perform power conversion on the electric energy output by the battery charging circuit 10 and output the electric energy to a wireless earphone when receiving the first control signal, so as to charge the wireless earphone until receiving the second control signal.
In some embodiments, the headset charging control circuit further includes a charging controller and a battery BAT, where the battery BAT may be a single battery BAT, or a battery BAT group formed by connecting a plurality of batteries BAT in series or in parallel. The battery charging circuit 10 converts the power supply outputted from the charging interface into the power stored in the battery BAT. The range of the stored electric energy of the battery BAT can be set according to the capacity of the charging box, for example, set to 2.8V to 4.2V, and can be specifically realized by using a rechargeable battery BAT such as a dry battery BAT, a lithium ion storage battery BAT, or a nickel-hydrogen battery BAT. The battery charging circuit 10 is controlled by the charging controller to charge the battery BAT and the wireless headset in the pair. The battery charging circuit 10 may adjust the output current according to whether the wireless headset is connected or not, specifically, the output current may be set according to the maximum input current that the wireless headset can accept, or may be adjusted according to the type of the connected wireless headset, and the current embodiment may be optionally set to 100 mA. For example, in some embodiments, the charging box and the wireless headset may communicate, and after the charging box may obtain the charging parameters of the wireless headset, the charging box may reconfigure the output current so as to enable the charging box to access the external power VCC and enable the wireless headset to be charged with a larger current when the charging box is accessed by the wireless headset. Or the output current can be set to be the maximum carrying current of the battery BAT, so that the storage battery BAT cannot be damaged when the charging box does not have the direct-current power supply VCC and the wireless earphone is charged through the battery BAT. The battery charging circuit 10 may charge the battery BAT and/or the wireless headset in a constant current mode, a constant voltage mode, an off mode, or other charging modes to improve the charging efficiency of the battery BAT and the wireless headset.
The output end of the battery BAT and the output end of the battery charging circuit 10 can be electrically connected through a flexible circuit board, a flat cable and the like, a battery BAT PAD1 and a PAD2 can be further arranged on an electric control board of the charging box, and the flat cable can be physically connected with the positive electrode and the negative electrode of the battery BAT through the flexible circuit board.
It should be noted that, in the combined charging (for example, the earphone and the charging box are both in the constant current charging stage, and the following embodiments also take the constant current stage as an example for description), since the battery charging circuit 10 and the battery BAT need to provide the charging current for the earphone, when the output terminal of the battery charging circuit 10, that is, the voltage of the battery BAT is too low, the output current of the battery BAT is larger at this time. When the charging current for charging the battery BAT is lower than the output current for charging the wireless earphone by the battery BAT, the charging path for charging the earphone by the charging box needs to be closed. As the voltage of the battery BAT of the battery pack continuously rises, the current required to be supplied by the battery BAT becomes smaller than the original current (the current required to be supplied to the headset by the battery BAT of the battery pack at low power), and the charging path for charging the headset is opened until the voltage of the battery BAT is increased until the input current of the battery BAT by the battery charging circuit 10 is larger than the current required to be output by the battery BAT. At the moment of opening, because the battery BAT needs to output current to the earphone, the charging current of the battery BAT is superposed with the output current and then is smaller than the original charging current, the voltage of the battery BAT falls, a turn-off mechanism is triggered, and a path for charging is closed. The voltage of the battery BAT of the charging box rises, and then a starting mechanism for charging the earphone is triggered, so that the charging box is continuously started and closed for charging the earphone in a circulating manner, and the earphone continuously jumps in a charging state and a non-charging state, so that the combined charging efficiency is reduced.
For this purpose, the present embodiment is provided with a voltage detection control circuit 20, and the voltage detection control circuit 20 can detect the voltage at the output terminal of the battery charging circuit 10, i.e. at both ends of the battery BAT, and control the operating state of the earphone charging circuit 30 according to the detected voltage to determine whether to charge the wireless earphone. Specifically, two preset voltage thresholds are set in the voltage detection control circuit 20, where the first preset voltage threshold is a voltage value for starting charging the wireless headset, and the second preset voltage threshold is a voltage value for stopping charging the wireless headset, for example, when the charger of the charging box is removed, the battery BAT of the charging box provides power for the wireless headset, and after the power of the battery BAT is continuously consumed, the power is reduced and is lower than the second preset voltage threshold.
Specifically, in the charging process, when it is detected that the voltage at the two ends of the battery BAT is smaller than the first preset voltage threshold, the voltage of the battery BAT is smaller than the charging voltage of the wireless headset, at this time, the voltage detection control circuit 20 controls the headset charging circuit 30 not to work, and when it is detected that the voltage at the two ends of the battery BAT is increased to be greater than or equal to the first preset voltage threshold, the headset charging circuit 30 is controlled to work, and the electric energy output by the battery charging circuit 10 and/or the electric energy output by the battery BAT are subjected to power conversion such as voltage boosting and filtering and then output to the wireless headset, so that the wireless headset is charged. At the moment of switching on the charging path of the wireless headset, the voltage of the battery BAT is pulled down to drop, and even if the voltage value output by the battery charging circuit 10 and the battery BAT drops, the charging voltage of the wireless headset can still be maintained and cannot be lower than a second preset voltage threshold value. Therefore, at this time, the voltage detection control circuit 20 controls the earphone charging circuit 30 to continue to operate, and performs power conversion such as voltage boosting and filtering on the electric energy output by the battery charging circuit 10 and/or the electric energy output by the battery BAT, and outputs the electric energy to the wireless earphone, thereby charging the wireless earphone.
It can be understood that, according to the type, electric quantity, endurance, service time, battery BAT loss, charging time, etc. of the wireless headset, the required current/voltage may also be different, and the voltage value output by the battery BAT may not directly satisfy the charging requirement of the wireless headset. The earphone charging circuit 30 of the present embodiment is controlled by the voltage detection control circuit 20 to boost the voltage value output from the battery BAT as necessary and then output the boosted voltage value. The boost circuit may be a boost circuit, or may be another topology capable of realizing boost.
The earphone charging control circuit of the invention is provided with a battery charging circuit 10 to access an external power supply and charge a battery BAT, a voltage value output by the battery charging circuit 10 is detected by a voltage detection control circuit 20, a first control signal is output when the detected voltage value is greater than a first preset voltage threshold value, the earphone charging circuit 30 is controlled to carry out power supply conversion on electric energy output by the battery charging circuit 10 and then output the electric energy to a wireless earphone to charge the wireless earphone, and a second control signal is output when the detected voltage value is less than a second preset voltage threshold value, so that the earphone charging circuit 30 is controlled to stop charging the wireless earphone. The earphone charging control circuit can maintain the charging voltage of the wireless earphone even if the voltage value output by the battery charging circuit 10 and the battery BAT falls when the voltage of the battery BAT drops when the charging path of the wireless earphone is switched on and the voltage value output by the battery BAT drops, thereby solving the problems that the charging path of the wireless earphone is closed due to the fact that the voltage of the battery BAT drops to trigger a turn-off mechanism, the charging path of the wireless earphone is continuously turned on and off due to the cycle promotion of the charging box to charge the earphone when the voltage of the battery BAT rises, the joint charging efficiency is reduced, and even the charging box and the wireless earphone are damaged in serious cases.
Referring to fig. 3, in an embodiment, the voltage detection control circuit 20 includes a sampling resistor R1 and a hysteresis comparator U1, a first end of the sampling resistor R1 is connected to the output terminal of the battery charging circuit 10, a second end of the sampling resistor R1 is connected to the input terminal of the hysteresis comparator U1, and an output terminal of the hysteresis comparator U1 is connected to the controlled terminal of the earphone charging circuit 30.
In the above embodiment, the voltage detection control circuit 20 includes the pull-up resistor R2, the first terminal of the pull-up resistor R2 is connected to the output terminal of the battery charging circuit 10, and the second terminal of the pull-up resistor R2 is connected to the controlled terminal of the earphone charging circuit 30.
In this embodiment, the hysteresis comparator U1 may set two threshold values (corresponding to a first preset voltage threshold and a second preset voltage threshold), when the charging box and the wireless headset are both in a charging phase, when the electric quantity of the battery BAT is lower than the first preset voltage threshold, for example, 3.7V (the threshold value may be set according to the type of the wireless headset, charging parameters, and the like, and is not limited here), at this time, the input voltage is lower than the threshold value (rising phase) of the hysteresis comparator U1U3 by 3.7V, the hysteresis comparator U1 outputs a low level, the hysteresis comparator U1 outputs a low level enable signal to the headset charging circuit 30, so that the headset charging circuit 30 does not operate, and does not output electric energy to the wireless headset, voltages on the charging interfaces J1 and J2, J3 and J4 of the wireless headset are all zero, until the voltage of the battery BAT rises to above 3.7V. When the voltage is 3.7V higher than the threshold value (rising stage) of the hysteresis comparator U1U3, the hysteresis comparator U1 outputs high level to enable the earphone charging circuit 30 to work, enabling is effective, the earphone charging circuit 30 outputs electric energy to the wireless earphone, that is, the voltages on the J1 and J2, and the J3 and J4 are both 5V, and the earphone starts to be charged. After the earphone starts to be charged, the battery BAT voltage of the charging box drops, but the battery BAT voltage is not lower than 3.3V, the battery BAT voltage at the moment is higher than the threshold value (descending stage) of the hysteresis comparator U1U3 by 3.3V, the output value of the hysteresis comparator U1 is still high level and unchanged, so that the enabling effect of the earphone charging circuit 30 is maintained, 5V is output, namely, the voltages on J1 and J2, and J3 and J4 are both 5V, and the earphone is still in a charged state and is unchanged. The resistor is used for applying the battery BAT voltage, and the current output to the hysteresis comparator U1 is limited to be too large, so that the hysteresis comparator U1 is damaged. The pull-up resistor R2 is used to pull up the voltage of the earphone charging circuit 30 when the battery BAT voltage is higher than the threshold value (rising phase) of the hysteresis comparator U1 by 3.7V, so as to ensure that the hysteresis comparator U1 outputs a high level, so that the earphone charging circuit 30 operates, and the control efficiency of the voltage detection control circuit 20 is improved.
According to the invention, the combined charging process of the earphone and the charging box is managed through the characteristic of hysteresis output (the threshold value of a descending stage is lower than the threshold value of an ascending stage) of the hysteresis comparator U1, so that the problem of switching between the charging state and the charging stop state of the earphone caused by too low electric quantity of the charging box (the current value which can be output by the battery BAT of the charging box is smaller than the actual required current value of the earphone end) is solved, the total charging time is reduced, the charging efficiency of the wireless earphone and the charging box is improved, and the service lives of the earphone battery BAT and the battery BAT of the charging box can be prolonged.
Referring to fig. 3, in an embodiment, the voltage detection control circuit 20 includes a sampling resistor R1 and a main controller (not shown), a first terminal of the sampling resistor R1 is connected to the output terminal of the battery charging circuit 10, a second terminal of the sampling resistor R1 is connected to the signal feedback terminal of the main controller, and a control terminal of the main controller is connected to the controlled terminal of the headset charging circuit 30.
The main controller may be implemented by a dedicated charging box control chip in the charging box, or may be implemented by an independent microprocessor, which is not limited herein. The main controller can be a microprocessor such as a single chip microcomputer, a DSP (digital signal processor), an FPGA (field programmable gate array) and the like, and a person skilled in the art can integrate some hardware circuits and software programs or algorithms in the main controller, connect all parts of the whole wireless headset by using various interfaces and lines, execute or execute the software programs and/or modules in the main controller and call data in the main controller, and execute various functions and process data of the charging box, so that the main controller is integrally monitored. The main controller can communicate with the wireless earphone to obtain the wireless earphone according to the model, the electric quantity, the cruising ability, the service time, the loss of the battery BAT, the charging time and the like. The main controller controls the earphone charging circuit 30 according to the detected voltage value of the battery BAT, when the voltage at two ends of the battery BAT is detected to be smaller than a first preset voltage threshold value, the voltage of the battery BAT is smaller than the charging voltage of the wireless earphone, at the moment, the main controller controls the earphone charging circuit 30 not to work, when the voltage at two ends of the battery BAT is detected to be increased to be larger than or equal to the first preset voltage threshold value, the earphone charging circuit 30 is controlled to work, the electric energy output by the battery charging circuit 10 and/or the electric energy output by the battery BAT are subjected to power conversion such as voltage increase and filtering and then are output to the wireless earphone, and therefore the wireless earphone is charged. At the moment of switching on the charging path of the wireless headset, the voltage of the battery BAT is pulled down to drop, and even if the voltage value output by the battery charging circuit 10 and the battery BAT drops, the charging voltage of the wireless headset can still be maintained and cannot be lower than a second preset voltage threshold value. It can be understood that, although the second preset voltage threshold is smaller than the first preset voltage threshold, the main controller only detects that the voltages at the two ends of the battery BAT are increased to be greater than or equal to the first preset voltage threshold and charges the wireless headset, and then compares the second preset voltage threshold with the detected voltage of the battery BAT to control the headset charging circuit 30 to stop working, so as to ensure that the wireless headset can be charged normally.
In one embodiment, the headset charging control circuit further includes a battery BAT;
the battery charging circuit 10 comprises a charging chip U2 and a current setting resistor R3, the input end of the charging chip U2 is the input end VBUS of the battery charging circuit 10, and the output end of the charging chip U2 is respectively connected with the battery BAT and the earphone charging circuit 30 through a direct current bus.
In the above embodiment, the battery charging circuit 10 further includes a current setting resistor R3, one end of the current setting resistor R3 is grounded, and the other end of the current setting resistor R3 is connected to the current setting terminal of the charging chip U2.
In this embodiment, the charging chip U2 has a charging current setting pin, that is, a current setting terminal, the current setting resistor R3 can be implemented by a digital control potentiometer, and the resistance value of the charging current setting pin is changed by the digital control potentiometer, so that the magnitude of the output current of the charging chip U2 during charging can be controlled. In this embodiment, the digital control potentiometer may be set to two resistance values, for example, different resistance values may be set according to whether the wireless headset is connected. In other embodiments, the digital control potentiometer may be set to have two or more resistance values, so that the output current is dynamically adjusted according to the type of the wireless headset when the wireless headset is charged and according to the difference of the battery BAT capacity of the wireless headset when the wireless headset is charged. The charging chip U2 can charge the wireless headset and the battery BAT in a trickle charge (low-voltage precharge) mode, a constant-current charge mode, a constant-voltage charge mode, and a charge cut-off charge mode. The battery charging circuit 10 further includes filter capacitors C11 and C22, wherein the filter capacitors C11 and C22 are respectively connected between the output terminal and the output terminal of the charging chip U2, so as to filter the input and output voltages of the charging chip U2.
Referring to fig. 3, in an embodiment, the earphone charging circuit 30 includes a boost chip U3, an inductor L1, and filter capacitors C21 and C22, an input terminal of the boost chip U3 is connected to the battery charging circuit 10, and an output terminal VCC of the boost chip U3 is connected to the wireless earphone; the enable end of the boosting chip U3 is connected with the control end of the voltage detection control circuit 20; the switch end of the boosting chip U3 is connected with the power supply input end through an inductor L1; the filter capacitors C21 and C22 are connected with the boost chip U3.
In this embodiment, the boost chip U3 is a power control chip. The boost chip U3 may boost the battery BAT voltage to the operating voltage of the wireless headset, e.g., 5V. The boost chip U3 is provided with an enable control pin, and the chip operates when receiving a high-level enable control signal and does not operate when receiving a low-level enable control signal. Of course, in other embodiments, the enable may also be set to be low-level enable, that is, the chip operates when the enable control signal of low level is received, and the chip does not operate when the enable control signal of high level is received, which is not limited herein. The boost chip U3 may receive the enable control signal output by the voltage detection control circuit 20, and when the voltage of the battery BAT is greater than the first preset voltage threshold, the boost chip U3 is controlled by the voltage detection control circuit 20 to operate and supply power to the wireless headset. The filter capacitors C21 and C22 are respectively connected between the output end and the output end of the boost chip U3 to filter the input and output voltages of the boost chip U3.
Referring to fig. 2, in an embodiment, the earphone charging control circuit further includes a USB interface circuit 40, an input terminal of the USB interface circuit 40 is connected to an external power source, and an output terminal of the USB interface circuit 40 is connected to the input terminal VBUS of the battery charging circuit 10.
In this embodiment, the USB interface circuit 40 is used to access an external power source, for example, a power adapter, a power cord, a mobile power source, and the like, the earphone interface circuit 50 includes a charging interface J5, the charging interface J5 may be a USB interface or a Type-C interface, and in other embodiments, the charging interface J5 may also be implemented by using other charging interfaces, which is not limited herein. The USB interface circuit 40 further includes a diode D1, and the diode D1 is used to implement a voltage clamp connected to the battery charging circuit 10 to prevent the voltage output to the battery charging circuit 10 from being too large and damaging the chip in the battery charging circuit 10.
Referring to fig. 2, in an embodiment, the headset charging control circuit further includes a headset interface circuit 50, an input end of the headset interface circuit 50 is connected to the headset charging circuit 30, and an output end of the headset interface circuit 50 is used for connecting to the wireless headset.
In this embodiment, earphone interface circuit 50 can optionally adopt pogo pin connector to realize, can be provided with the recess in the charging box, dispose corresponding metal interface or metal probe in this recess, also be the electric connector, the electric connector and the interface adaptation that charges of wireless earphone, when wireless earphone puts into the recess of charging box, the electric connector and the electric connector contact of wireless earphone, because the shell fragment and the metal interface is the conducting material, at this moment, wireless earphone and the box electric conductance that charges. Since wireless headsets are typically used for human ears, the wireless headset may include a pair of symmetrical housings, and two electrical connectors may correspond in the charging box. The charging box can also be used for accommodating the wireless earphone when the wireless earphone is in a non-charging state. When the pogo pin connector is implemented, charging interfaces J1, J2, J3 and J4 between the charging box and the earphone are further arranged on the electric control board of the charging box. Diodes D2 and D3 are further arranged on the charging interfaces J1, J2, J3 and J4 and used for clamping the voltage output to the wireless earphones so as to avoid damage to the wireless earphones due to overhigh voltage. In some embodiments, the electric connector may further be provided with a magnetic conductive member to ensure that the electric connector and the electric connector of the wireless headset can be tightly connected when the headset is placed on the electric connector of the charging box, so as to prevent the wireless headset or the charging box from being damaged due to poor contact between the electric connector and the charging interface of the headset.
The invention also provides a charging box which comprises the earphone charging control circuit. The detailed structure of the charging control circuit of the earphone can refer to the above embodiments, and is not described herein again; it can be understood that, because the charging box of the present invention employs the above-mentioned earphone charging control circuit, the embodiment of the charging box of the present invention includes all technical solutions of all embodiments of the above-mentioned earphone charging control circuit, and the achieved technical effects are also completely the same, and are not described herein again.
In an embodiment, the charging box further includes a housing, the housing is used for accommodating the energy storage assembly and the charging controller, the electrical connector and the charging interface may be on the housing, the housing may be circular or square, and the specific structure of the housing may be set according to the size of the wireless headset, the size of the electronic control board, the size of the battery, and the like, which is not limited herein. The shell can be made of light and insulating materials.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An earphone charging control circuit, comprising:
the input end of the battery charging circuit is connected with an external power supply;
the voltage detection control circuit is connected with the output end of the battery charging circuit and is configured to detect a voltage value output by the battery charging circuit, output a first control signal when the detected voltage value is larger than a first preset voltage threshold value and output a second control signal when the detected voltage value is smaller than a second preset voltage threshold value; wherein the first preset voltage threshold is greater than the second preset voltage threshold; after the earphone starts to be charged, when the detected voltage value is smaller than the first preset voltage threshold value and not smaller than the second preset voltage threshold value, continuously outputting a first control signal;
the earphone charging circuit is connected with the output end of the battery charging circuit, and is configured to perform power conversion on electric energy output by the battery charging circuit and output the electric energy to a wireless earphone when the first control signal is received, so that the wireless earphone is charged until the second control signal is received.
2. The headset charging control circuit of claim 1, wherein the voltage detection control circuit comprises a sampling resistor and a hysteresis comparator, a first end of the sampling resistor is connected to the output terminal of the battery charging circuit, a second end of the sampling resistor is connected to the input terminal of the hysteresis comparator, and an output terminal of the hysteresis comparator is connected to the controlled terminal of the headset charging circuit.
3. The headset charge control circuit of claim 2, wherein the voltage detection control circuit comprises a pull-up resistor, a first terminal of the pull-up resistor being connected to the output terminal of the battery charging circuit, and a second terminal of the pull-up resistor being connected to the controlled terminal of the headset charging circuit.
4. The headset charging control circuit of claim 1, wherein the voltage detection control circuit comprises a sampling resistor and a main controller, a first terminal of the sampling resistor is connected to the output terminal of the battery charging circuit, a second terminal of the sampling resistor is connected to the signal feedback terminal of the main controller, and a control terminal of the main controller is connected to the controlled terminal of the headset charging circuit.
5. The headset charge control circuit of claim 1, wherein the headset charge control circuit further comprises a battery;
the battery charging circuit comprises a charging chip and a current setting resistor, the input end of the charging chip is the input end of the battery charging circuit, and the output end of the charging chip is connected with the battery and the earphone charging circuit through a direct current bus respectively.
6. The headset charge control circuit of claim 5, wherein the battery charging circuit further comprises a current setting resistor, one end of the current setting resistor is connected to ground, and the other end of the current setting resistor is connected to the current setting end of the charging chip.
7. The headset charging control circuit of claim 1, wherein the headset charging circuit comprises a boost chip, an inductor and a filter capacitor, an input terminal of the boost chip is connected to the battery charging circuit, and an output terminal of the boost chip is connected to the wireless headset; the enabling end of the boosting chip is connected with the control end of the voltage detection control circuit; the switch end of the boosting chip is connected with the output end of the battery charging circuit through an inductor; the filter capacitor is connected with the boost chip.
8. The headset charging control circuit according to any one of claims 1 to 7, further comprising a USB interface circuit, wherein an input terminal of the USB interface circuit is connected to an external power source, and an output terminal of the USB interface circuit is connected to an input terminal of the battery charging circuit.
9. The headset charging control circuit according to any of claims 1-7, further comprising a headset interface circuit, an input of the headset interface circuit being connected to the headset charging circuit, and an output of the headset interface circuit being used to connect to the wireless headset.
10. A charging box, characterized by comprising the earphone charging control circuit according to any one of claims 1 to 9.
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| CN202010594079.0A CN111740460B (en) | 2020-06-24 | 2020-06-24 | Earphone charging control circuit and charging box |
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| CN112399321B (en) * | 2020-10-09 | 2022-05-03 | 深圳市思远半导体有限公司 | Bluetooth headset, Bluetooth headset state monitoring method and readable storage medium |
| CN114448102A (en) * | 2020-11-06 | 2022-05-06 | Oppo广东移动通信有限公司 | Earphone box, wireless charging method, equipment and storage medium |
| CN113206530B (en) * | 2021-05-18 | 2023-08-11 | 江西联创宏声万安电子有限公司 | Wireless earphone charging method and charging system |
| CN113873383B (en) * | 2021-09-27 | 2024-07-30 | 歌尔科技有限公司 | Earphone in-out box detection method and circuit, earphone box and earphone |
| CN113964901B (en) * | 2021-10-19 | 2024-05-10 | 马嘉泽 | Wireless earphone box |
| CN115347632B (en) * | 2022-06-30 | 2023-06-27 | 广芯微电子（广州）股份有限公司 | Method, device and system for battery charging management of TWS earphone |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI242994B (en) * | 2004-01-06 | 2005-11-01 | Huges Hi Tech Inc | Wireless earphone and its charging circuit and its charging method |
| CN103078365B (en) * | 2012-12-26 | 2015-12-23 | 青岛歌尔声学科技有限公司 | Charging bluetooth earphone box and charging method thereof |
| CN107623362A (en) * | 2017-11-08 | 2018-01-23 | 深圳市沃特沃德股份有限公司 | Wireless headset charging box and its control method and device |
| CN209250288U (en) * | 2018-12-12 | 2019-08-13 | 北京农业智能装备技术研究中心 | A kind of dual threshold charge-discharge protection circuit |
| CN209642936U (en) * | 2019-06-03 | 2019-11-15 | 广州由我科技股份有限公司 | A kind of charging cabin, bluetooth headset and charging bluetooth earphone system |
| CN111049230B (en) * | 2019-12-31 | 2024-03-08 | 歌尔科技有限公司 | Wireless earphone, charging method thereof, charging box and readable storage medium |
| CN111163388B (en) * | 2019-12-31 | 2021-08-10 | 歌尔股份有限公司 | Management method and device for charging path of Bluetooth headset and readable storage medium |
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