Headphone charging circuit, headphone charging system and electronic equipment

Abstract

The present application is applicable to the field of earphone charging technology, and provides an earphone charging circuit, an earphone charging system and an electronic device. The earphone charging circuit includes a power module, a control module, a first voltage conversion module and a second voltage conversion module. The first voltage conversion module is electrically connected to the power module and the control module respectively, and the second voltage conversion module is electrically connected to the power module and the control module respectively. The first voltage conversion module and the control module are both used to be electrically connected to the first earphone, and the second voltage conversion module and the control module are both used to be electrically connected to the second earphone. The first voltage conversion module outputs the first voltage required by the first earphone according to the first control signal, and the second voltage conversion module outputs the second voltage required by the second earphone according to the second control signal. There is no need to set a chip in each of the first earphone and the second earphone for voltage conversion again. The energy of the power module is transferred to the earphone only requires one voltage conversion, which greatly improves the efficiency of earphone charging.

Description

Technical Field

[0001] The present application belongs to the field of earphone charging technology, and in particular relates to an earphone charging circuit, an earphone charging system and an electronic device. Background Art

[0002] In the existing earphone charging scheme, there are mainly two schemes for charging earphones with earphone charging boxes. One is the traditional scheme: the battery voltage in the charging box is first boosted, and the earphones then convert the boosted voltage into the voltage for charging the earphone battery through the built-in charging chip. The other is the follow-up charging scheme: the boosted output voltage of the charging box battery changes with the higher battery voltage in the earphone, and a voltage difference is added as the output voltage on the basis of the higher battery voltage, and the earphones then convert the voltage into the voltage for charging the earphone battery through the built-in charging chip. However, no matter which of the above schemes is used, there is only one boost in the charging box, and the voltage output to the left and right earphones is the same. In addition, each of the left and right earphones needs to have a built-in charging chip to convert the voltage output by the charging box again, so as to charge the earphones. Therefore, in the existing earphone charging scheme, the energy of the charging box battery needs to be transferred to the earphone through two voltage conversions, resulting in low earphone charging efficiency. Summary of the invention

[0003] The embodiments of the present application provide an earphone charging circuit, an earphone charging system and an electronic device, which can solve the problem in existing earphone charging solutions that the energy of the charging box battery needs to undergo two voltage conversions to be transferred to the earphone, resulting in low earphone charging efficiency.

[0004] In a first aspect, an embodiment of the present application provides an earphone charging circuit, including a power module, a control module, a first voltage conversion module, and a second voltage conversion module, wherein the first voltage conversion module is electrically connected to the power module and the control module respectively, and the second voltage conversion module is electrically connected to the power module and the control module respectively, and the first voltage conversion module and the control module are both used to be electrically connected to a first earphone, and the second voltage conversion module and the control module are both used to be electrically connected to a second earphone;

[0005] The control module is used to monitor the first power of the first earphone and the second power of the second earphone, and output a first control signal to the first voltage conversion module according to the first power, and output a second control signal to the second voltage conversion module according to the second power; the first voltage conversion module is used to convert the power voltage output by the power module into the first voltage required by the first earphone according to the first control signal; the second voltage conversion module is used to convert the power voltage into the second voltage required by the second earphone according to the second control signal.

[0006] In a possible implementation manner of the first aspect, the earphone charging circuit further includes a first current detection module and a second current detection module, where both the first current detection module and the second current detection module are electrically connected to the control module, the first current detection module is used to be electrically connected to the first earphone, and the second current detection module is used to be electrically connected to the second earphone;

[0007] The first current detection module is used to detect a first current and output a first current signal to the control module, wherein the first current is a charging current of the first earphone; the second current detection module is used to detect a second current and output a second current signal to the control module, wherein the second current is a charging current of the second earphone.

[0008] In a possible implementation manner of the first aspect, the first current detection module includes a first resistor and a first amplifier, the first end of the first resistor is electrically connected to the first input end of the first amplifier, the first end of the first resistor is used to be electrically connected to the first earphone, the second end of the first resistor is electrically connected to the second input end of the first amplifier, and the output end of the first amplifier is electrically connected to the control module;

[0009] The second current detection module includes a second resistor and a second amplifier, the first end of the second resistor is electrically connected to the first input end of the second amplifier, the first end of the second resistor is used to be electrically connected to the second earphone, the second end of the second resistor is electrically connected to the second input end of the second amplifier, and the output end of the second amplifier is electrically connected to the control module.

[0010] In a possible implementation manner of the first aspect, the earphone charging circuit further includes a first switch module, a second switch module, a third switch module, and a fourth switch module, the first switch module is used to be connected between the first voltage conversion module and the first earphone, the second switch module is used to be connected between the first current detection module and the first earphone, the third switch module is used to be connected between the second voltage conversion module and the second earphone, the fourth switch module is used to be connected between the second current detection module and the second earphone, and the first switch module, the second switch module, the third switch module, and the fourth switch module are all electrically connected to the control module;

[0011] When the first switch module is turned on according to the first switch signal output by the control module, and the second switch module is turned on according to the second switch signal output by the control module, the control module is used to output a first control signal to the first voltage conversion module according to the first electric quantity; the first voltage conversion module is used to convert the power supply voltage into the first voltage according to the first control signal; the first current detection module is used to detect the first current and output the first current signal to the control module;

[0012] When the third switch module is turned on according to the third switch signal output by the control module and the fourth switch module is turned on according to the fourth switch signal output by the control module, the control module is used to output a second control signal to the second voltage conversion module according to the second electrical quantity; the second voltage conversion module is used to convert the power supply voltage into the second voltage according to the second control signal; the second current detection module is used to detect the second current and output the second current signal to the control module.

[0013] In a possible implementation manner of the first aspect, the first switch module includes a first switch, a first conductive end of the first switch is electrically connected to the first voltage conversion module, a second conductive end of the first switch is used to be electrically connected to the first earphone, and a control end of the first switch is electrically connected to the control module;

[0014] The second switch module includes a second switch, a first conduction end of the second switch is electrically connected to the first current detection module, a second conduction end of the second switch is used to be electrically connected to the first earphone, and a control end of the second switch is electrically connected to the control module;

[0015] The third switch module comprises a third switch, a first conducting end of the third switch is electrically connected to the second voltage conversion module, a second conducting end of the third switch is used to be electrically connected to the second earphone, and a control end of the third switch is electrically connected to the control module;

[0016] The fourth switch module includes a fourth switch, a first conduction end of the fourth switch is electrically connected to the second current detection module, a second conduction end of the fourth switch is used to be electrically connected to the second earphone, and a control end of the fourth switch is electrically connected to the control module.

[0017] In a possible implementation manner of the first aspect, the earphone charging circuit further includes a first load detection module and a second load detection module, the first load detection module is electrically connected to the control module and the second switch module, respectively, the first load detection module is used to be electrically connected to the first earphone, the second load detection module is electrically connected to the control module and the fourth switch module, respectively, and the second load detection module is used to be electrically connected to the second earphone;

[0018] When the first switch module is turned on and the second switch module is turned off, the first load detection module is used to output a first detection signal to the control module according to a first node voltage, and the first node voltage is a voltage at a common end of the first load detection module and the second switch module; when the third switch module is turned on and the fourth switch module is turned off, the second load detection module is used to output a second detection signal to the control module according to a second node voltage, and the second node voltage is a voltage at a common end of the second load detection module and the fourth switch module.

[0019] In a second aspect, an embodiment of the present application provides an earphone charging system, comprising a first earphone, a second earphone, and the earphone charging circuit described in any one of the first aspects, wherein the first earphone and the second earphone are electrically connected to a control module, a first switch module, a second switch module, a third switch module, and a fourth switch module in the earphone charging circuit.

[0020] In a possible implementation manner of the second aspect, the first earphone includes a first unidirectional conduction module, a first battery module, and a first earphone system, the first unidirectional conduction module is electrically connected to the first battery module, the first earphone system, the first switch module, and the control module respectively, and the first battery module is electrically connected to the first earphone system and the second switch module respectively;

[0021] The first unidirectional conduction module is used to prevent the first battery voltage output by the first battery module from being transmitted to the first switch module; the first earphone system is used to detect a first interface voltage and determine the position information of the first earphone according to the first interface voltage; wherein the first interface voltage is the voltage of the first end of the first earphone;

[0022] The second earphone comprises a second unidirectional conduction module, a second battery module and a second earphone system, the second unidirectional conduction module is electrically connected to the second battery module, the second earphone system, the third switch module and the control module respectively, and the second battery module is electrically connected to the second earphone system and the fourth switch module respectively;

[0023] The second unidirectional conduction module is used to prevent the second battery voltage output by the second battery module from being transmitted to the third switch module; the second earphone system is used to detect the second interface voltage and determine the position information of the second earphone according to the second interface voltage; wherein the second interface voltage is the voltage of the first end of the second earphone.

[0024] In a possible implementation manner of the second aspect, the first unidirectional conduction module includes a first diode, an anode of the first diode is electrically connected to the first end of the first earphone system and the first switch module respectively, and a cathode of the first diode is electrically connected to the second end of the first earphone system and the first battery module respectively;

[0025] The second unidirectional conduction module includes a second diode, an anode of the second diode is electrically connected to the first end of the second earphone system and the third switch module respectively, and a cathode of the second diode is electrically connected to the second end of the second earphone system and the second battery module respectively.

[0026] In a third aspect, an embodiment of the present application provides an electronic device, comprising the earphone charging system described in any one of the second aspects.

[0027] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0028] The earphone charging circuit provided in the embodiment of the present application includes a power module, a control module, a first voltage conversion module and a second voltage conversion module. Among them, the control module can monitor the first power of the first earphone and the second power of the second earphone, so as to determine whether the first earphone and the second earphone need to be charged. When it is determined that the first earphone needs to be charged, the control module outputs a first control signal to the first voltage conversion module according to the first power, so that the first voltage conversion module converts the power voltage output by the power module into the first voltage required by the first earphone, thereby realizing the charging of the first earphone. When it is determined that the second earphone needs to be charged, the control module outputs a second control signal to the second voltage conversion module according to the second power, so that the second voltage conversion module converts the power voltage output by the power module into the second voltage required by the second earphone, thereby realizing the charging of the second earphone. It can be seen from this that the earphone charging circuit provided in the embodiment of the present application is provided with a first voltage conversion module and a second voltage conversion module, and the first voltage conversion module can output the first voltage required by the first earphone according to the first control signal output by the control module, and the second voltage conversion module can output the second voltage required by the second earphone according to the second control signal output by the control module, thereby realizing the charging of the first earphone and the second earphone. In this way, there is no need to set a chip in the first earphone and the second earphone to perform voltage conversion again, that is, the energy of the power module only needs one voltage conversion to transfer to the earphone, thereby greatly improving the efficiency of earphone charging. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0030] Figure 1 is a principle block diagram of an earphone charging circuit provided in an embodiment of the present application;

[0031] Figure 2 is a principle block diagram of an earphone charging circuit provided in another embodiment of the present application;

[0032] Figure 3 This is a circuit connection diagram of a first current detection module and a second current detection module provided in an embodiment of the present application;

[0033] Figure 4 This is a partial circuit connection diagram of an earphone charging circuit provided in an embodiment of the present application;

[0034] Figure 5 is a principle block diagram of an earphone charging system provided by an embodiment of the present application;

[0035] Figure 6 This is a circuit connection diagram of a first one-way conduction module and a second one-way conduction module provided in one embodiment of the present application.

[0036] In the figure: 10, earphone charging circuit; 101, power module; 102, control module; 103, first voltage conversion module; 104, second voltage conversion module; 105, first current detection module; 106, second current detection module; 107, first switch module; 108, second switch module; 109, third switch module; 110, fourth switch module; 111, first load detection module; 112, second load detection module; 20, first earphone; 201, first unidirectional conduction module; 202, first battery module; 203, first earphone system; 30, second earphone; 301, second unidirectional conduction module; 302, second battery module; 303, second earphone system. DETAILED DESCRIPTION

[0037] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0038] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0039] As used in the specification and appended claims of this application, the term "if" can be interpreted as "when" or "uponce" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "uponce it is determined" or "in response to determining" or "uponce [described condition or event] is detected" or "in response to detecting [described condition or event]", depending on the context.

[0040] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0041] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0042] In the existing earphone charging scheme, there are mainly two schemes for charging earphones with earphone charging boxes. One is the traditional scheme: the battery voltage in the charging box is first boosted, and the earphones then convert the boosted voltage into the voltage for charging the earphone battery through the built-in charging chip. The other is the follow-up charging scheme: the boosted output voltage of the charging box battery changes with the higher battery voltage in the earphone, and a voltage difference is added as the output voltage on the basis of the higher battery voltage, and the earphones then convert the voltage into the voltage for charging the earphone battery through the built-in charging chip. However, no matter which of the above schemes is used, there is only one boost in the charging box, and the voltage output to the left and right earphones is the same. In addition, each of the left and right earphones needs to have a built-in charging chip to convert the voltage output by the charging box again, so as to charge the earphones. Therefore, in the existing earphone charging scheme, the energy of the charging box battery needs to be transferred to the earphone through two voltage conversions, resulting in low earphone charging efficiency.

[0043] Based on the above problems, the headset charging circuit provided by the embodiment of the present application includes a power module, a control module, a first voltage conversion module and a second voltage conversion module. Among them, the control module can monitor the first power of the first headset and the second power of the second headset, so as to determine whether the first headset and the second headset need to be charged. When it is determined that the first headset needs to be charged, the control module outputs a first control signal to the first voltage conversion module according to the first power, so that the first voltage conversion module converts the power voltage output by the power module into the first voltage required by the first headset, thereby realizing the charging of the first headset. When it is determined that the second headset needs to be charged, the control module outputs a second control signal to the second voltage conversion module according to the second power, so that the second voltage conversion module converts the power voltage output by the power module into the second voltage required by the second headset, thereby realizing the charging of the second headset. It can be seen from this that the headset charging circuit provided by the embodiment of the present application is provided with a first voltage conversion module and a second voltage conversion module, and the first voltage conversion module can output the first voltage required by the first headset according to the first control signal output by the control module, and the second voltage conversion module can output the second voltage required by the second headset according to the second control signal output by the control module, thereby realizing the charging of the first headset and the second headset. In this way, there is no need to set a chip in the first earphone and the second earphone to perform voltage conversion again, that is, the energy of the power module only needs one voltage conversion to transfer to the earphone, thereby greatly improving the efficiency of earphone charging.

[0044] In order to illustrate the technical solution described in this application, a specific embodiment is provided below for illustration.

[0045] Figure 1 FIG. 1 shows a principle block diagram of an earphone charging circuit 10 provided in an embodiment of the present application. Figure 1As shown, the earphone charging circuit 10 includes a power module 101, a control module 102, a first voltage conversion module 103 and a second voltage conversion module 104. The first voltage conversion module 103 is electrically connected to the power module 101 and the control module 102 respectively, and the second voltage conversion module 104 is electrically connected to the power module 101 and the control module 102 respectively. The first voltage conversion module 103 and the control module 102 are both used to be electrically connected to the first earphone 20, and the second voltage conversion module 104 and the control module 102 are both used to be electrically connected to the second earphone 30.

[0046] Specifically, the control module 102 can monitor the first power level of the first earphone 20 and the second power level of the second earphone 30, so as to determine whether the first earphone 20 and the second earphone 30 need to be charged. When it is determined that the first earphone 20 needs to be charged, the control module 102 outputs a first control signal to the first voltage conversion module 103 according to the first power level, so that the first voltage conversion module 103 converts the power voltage output by the power module 101 into the first voltage required by the first earphone 20, thereby charging the first earphone 20. When it is determined that the second earphone 30 needs to be charged, the control module 102 outputs a second control signal to the second voltage conversion module 104 according to the second power level, so that the second voltage conversion module 104 converts the power voltage output by the power module 101 into the second voltage required by the second earphone 30, thereby charging the second earphone 30. It can be seen that the earphone charging circuit 10 provided in the embodiment of the present application is provided with a first voltage conversion module 103 and a second voltage conversion module 104, and the first voltage conversion module 103 can output the first voltage required by the first earphone 20 according to the first control signal output by the control module 102, and the second voltage conversion module 104 can output the second voltage required by the second earphone 30 according to the second control signal output by the control module 102, thereby realizing the charging of the first earphone 20 and the second earphone 30. In this way, there is no need to set a chip in each of the first earphone 20 and the second earphone 30 for voltage conversion again, that is, the energy of the power module 101 is transferred to the earphone only needs one voltage conversion, thereby greatly improving the efficiency of earphone charging.

[0047] It should be noted that the first voltage conversion module 103 is used to be electrically connected to the first end of the first earphone 20, the second voltage conversion module 104 is used to be electrically connected to the first end of the second earphone 30, and the control module 102 is used to be electrically connected to the first end of the first earphone 20 and the first end of the second earphone 30, respectively. Among them, the first end of the first earphone 20 is the positive pole of the charging port of the first earphone 20, the second end of the first earphone 20 is the negative pole of the charging port of the first earphone 20, the first end of the second earphone 30 is the positive pole of the charging port of the second earphone 30, and the second end of the second earphone 30 is the negative pole of the charging port of the second earphone 30.

[0048] It should be noted that there are usually two ways for the control module 102 to obtain the first power of the first earphone 20 and the second power of the second earphone 30. The first way is to obtain the power through wired communication. If the control module 102 supports wireless communication, it can also be obtained through wireless communication. The second way is that the control module 102 can also determine the first power of the first earphone 20 by judging the difference between the first preset output voltage and the first preset output current and the actual first output voltage and the first output current, and determine the second power of the second earphone 30 by judging the difference between the second preset output voltage and the second preset output current and the actual second output voltage and the second output current. Since the control module 102 can monitor the first power and the second power in real time, it can adjust the voltage and current output by the first voltage conversion module 103 and the second voltage conversion module 104 in real time, thereby improving the charging efficiency of the earphones.

[0049] It should be noted that the earphone charging circuit 10 is included in the earphone charging box. If the earphone is shut down due to low power and cannot communicate, or the earphone battery is in a low-power protection state, the earphone charging box (i.e., the earphone charging circuit 10) can charge the earphone in a manner of outputting a smaller current limit in accordance with a pre-set setting and gradually providing voltage. When the earphone battery is full, the earphone charging circuit 10 stops the boost output, and can send a command to the earphone to inform the earphone to stop charging through the earphone charging port communication method, or can determine whether the earphone is full by detecting the earphone battery voltage and the earphone charging port voltage in real time inside the earphone. Among them, the earphone charging port is the interface for the earphone to receive the charging voltage.

[0050] Exemplarily, taking the second acquisition method as an example, (1) if the preset output voltage is 3.3V and the output current is limited to 10mA, but the actual output voltage is detected to be lower than 3.3V and the charging current is 10mA, it can be determined that the headphone battery is in a low power or trickle charging state. At this time, the output voltage and current are kept unchanged and trickle charging continues. If the actual voltage at the detection end is 3.3V, but the output current is less than 10mA, it is determined that the battery voltage is higher than or close to 3.3V. At this time, the current is limited to 100mA, thereby increasing the output voltage to ensure that the headphones are charged at the maximum current in the maximum efficiency state. (2) If the preset output voltage is 3.8V and the output current is limited to 100mA, but the actual output voltage at the detection end is 3.6V and the charging current is 100mA, it can be determined that the battery voltage of the headphones is lower than 3.6V and the headphones are in a constant current charging state. At this time, the preset output voltage is adjusted to keep the current limit unchanged to ensure that the overall conversion efficiency reaches the highest. (3) If the maximum charging voltage of the earphone is 4.2V, and the voltage drop of a diode channel connected in series at the earphone end is 0.2V, then the preset maximum charging voltage for the earphone is 4.4V. When the preset output voltage reaches 4.4V, the output current is limited to 100mA, and the actual output voltage of the detection end is also 4.4V, the actual charging current begins to gradually decrease, then it can be determined that the earphone is in a constant voltage charging state. When the charging current is less than 10mA, it can be considered that the earphone is fully charged, and charging can be stopped at this time. It should be explained that the voltage and current parameters in the above examples are used for illustrative purposes only. The actual parameters can be set or adjusted in real time according to the performance of the earphone battery, and the charging of the first earphone 20 and the charging of the second earphone 30 can be controlled separately.

[0051] For example, the charging efficiency of the traditional charging solution mentioned in the above background technology is usually below 65%, and the charging efficiency of the follow-up charging solution is usually around 70% to 80%. The charging solution proposed in this application can theoretically achieve a charging efficiency of more than 90%. Moreover, with the same battery capacity of the headphone charging box, the overall battery life can be improved by more than 10% compared with the existing voltage-following charging solution; compared with the traditional charging solution, the battery life can be improved by more than 20%. In addition, compared with the traditional solution, for the same battery life of the whole machine, the battery capacity of the headphone charging box can be reduced by 10% to 20%, which can further reduce the size of the headphone charging box and make the product more compact.

[0052] It should be noted that if Figure 2As shown, the power module 101 includes a charging module and a battery module, wherein the charging module is used to charge the battery module, and the battery module generally includes a battery cell and a battery protection module, which is used to output the power supply voltage to the first voltage conversion module 103 and the second voltage conversion module 104. The control module 102 includes a logic controller MCU, which is used to control and adjust the charging voltage and charging current transmitted to the earphones (the first earphone 20 and the second earphone 30). The first voltage conversion module 103 includes a buck-boost conversion circuit, which is used to boost or buck the power supply voltage to obtain the first voltage required by the first earphone 20. The second voltage conversion module 104 includes a buck-boost conversion circuit, which is used to boost or buck the power supply voltage to obtain the second voltage required by the second earphone 30. The first voltage conversion module 103 and the second voltage conversion module 104 work independently, and the output voltage and output current of the buck-boost conversion circuit are controlled by the MCU. When the power supply voltage is higher than the earphone battery voltage, it is in buck mode; otherwise, it is in boost mode. If the power supply voltage and the earphone battery voltage are close, it is also in boost mode, and the earphone charging current is controlled by current limiting.

[0053] In one embodiment of the present application, Figure 2 As shown, the earphone charging circuit 10 also includes a first current detection module 105 and a second current detection module 106. The first current detection module 105 and the second current detection module 106 are both electrically connected to the control module 102. The first current detection module 105 is used to be electrically connected to the first earphone 20, and the second current detection module 106 is used to be electrically connected to the second earphone 30.

[0054] Specifically, the first current detection module 105 is used to detect a first current and output a first current signal to the control module 102, wherein the first current is the charging current of the first earphone 20. The second current detection module 106 is used to detect a second current and output a second current signal to the control module 102, wherein the second current is the charging current of the second earphone 30. By setting the first current detection module 105, it can be determined whether the first earphone 20 is suddenly taken out during the charging process, and by setting the second current detection module 106, it can be determined whether the second earphone 30 is suddenly taken out during the charging process. Specifically, when the charging current (first current) of the first earphone 20 suddenly disappears, the first current signal received by the control module 102 will suddenly change, and the control module 102 can determine that the first earphone 20 is suddenly taken out during the charging process. When the charging current (second current) of the second earphone 30 suddenly disappears, the second current signal received by the control module 102 will suddenly change, and the control module 102 can determine that the second earphone 30 is suddenly taken out during the charging process.

[0055] It should be noted that the control module 102 can also determine the actual charging current of the first earphone 20 according to the received first current signal, and adjust the output voltage and output current of the first voltage conversion module 103 in real time. The control module 102 can also determine the actual charging current of the second earphone 30 according to the received second current signal, and adjust the output voltage and output current of the second voltage conversion module 104 in real time.

[0056] In one embodiment of the present application, Figure 3 As shown, the first current detection module 105 includes a first resistor R1 and a first amplifier U1, wherein the first end of the first resistor R1 is electrically connected to the first input end of the first amplifier U1, the first end of the first resistor R1 is used to be electrically connected to the first earphone 20, the second end of the first resistor R1 is electrically connected to the second input end of the first amplifier U1, and the output end of the first amplifier U1 is electrically connected to the control module 102. The second current detection module 106 includes a second resistor R2 and a second amplifier U2, wherein the first end of the second resistor R2 is electrically connected to the first input end of the second amplifier U2, the first end of the second resistor R2 is used to be electrically connected to the second earphone 30, the second end of the second resistor R2 is electrically connected to the second input end of the second amplifier U2, and the output end of the second amplifier U2 is electrically connected to the control module 102.

[0057] Specifically, the first current flows through the first resistor R1, generating a voltage drop on the first resistor R1, and then the voltage at the first end and the voltage at the second end of the first resistor R1 are transmitted to the first amplifier U1, and the first amplifier U1 amplifies the input voltage signal to a voltage (first current signal) that can be recognized by the control module 102, and the control module 102 determines the charging current of the first earphone 20 according to the first current signal. Similarly, the second current flows through the second resistor R2, generating a voltage drop on the second resistor R2, and then the voltage at the first end and the voltage at the second end of the second resistor R2 are transmitted to the second amplifier U2, and the second amplifier U2 amplifies the input voltage signal to a voltage (second current signal) that can be recognized by the control module 102, and the control module 102 determines the charging current of the second earphone 30 according to the second current signal.

[0058] Exemplarily, the resistance of the first resistor R1 and the resistance of the second resistor R2 can be set to milliohm level. For example, the resistance of the first resistor R1 and the resistance of the second resistor R2 can be set to less than 100 milliohms without affecting the charging function.

[0059] In one embodiment of the present application, Figure 2As shown, the earphone charging circuit 10 further includes a first switch module 107, a second switch module 108, a third switch module 109 and a fourth switch module 110. The first switch module 107 is used to connect between the first voltage conversion module 103 and the first earphone 20. The second switch module 108 is used to connect between the first current detection module 105 and the first earphone 20. The third switch module 109 is used to connect between the second voltage conversion module 104 and the second earphone 30. The fourth switch module 110 is used to connect between the second current detection module 106 and the second earphone 30. The first switch module 107, the second switch module 108, the third switch module 109 and the fourth switch module 110 are all electrically connected to the control module 102.

[0060] Specifically, the first switch module 107 is used to be electrically connected to the first end of the first earphone 20, and the second switch module 108 is used to be electrically connected to the second end of the first earphone 20, wherein the second end of the first earphone 20 is the negative pole of the charging port of the first earphone 20. The third switch module 109 is used to be electrically connected to the first end of the second earphone 30, and the fourth switch module 110 is used to be electrically connected to the second end of the second earphone 30, wherein the second end of the second earphone 30 is the negative pole of the charging port of the second earphone 30. When the control module 102 controls the first switch module 107, the second switch module 108, the third switch module 109 and the fourth switch module 110 to be turned on, the control module 102 can output the first control signal and the second control signal, so that the first voltage conversion module 103 and the second voltage conversion module 104 convert the power supply voltage to realize charging of the first earphone 20 and the second earphone 30. During the charging process of the earphone, the first current detection module 105 and the second current detection module 106 can detect the charging current and output the corresponding current signal to the control module 102.

[0061] It should be noted that the on or off of the first switch module 107, the second switch module 108, the third switch module 109 and the fourth switch module 110 are all controlled by the control module 102. When the control module 102 needs to communicate with the first earphone 20 or the second earphone 30, the control module 102 controls the first switch module 107 and the third switch module 109 to be disconnected, and controls the second switch module 108 and the fourth switch module 110 to be turned on. At this time, the control module 102 can communicate with the first earphone 20 and the second earphone 30. During the communication process, since the first switch module 107 and the third switch module 109 are both disconnected, the output interface (the common end of the first switch module 107 and the control module 102 and the common end of the third switch module 109 and the control module 102) is not affected by the output voltage of the voltage conversion module (the first voltage conversion module 103 and the second voltage conversion module 104), that is, the signal of the output interface is directly connected to the control module 102, and the control module 102 can output the signal to the output interface (the signal of the positive pole of the charging port of the earphone), or read the level signal from the positive pole of the charging port of the earphone to obtain the signal sent by the earphone. As can be seen from the above, the first switch module 107 is also used to control the communication between the first earphone 20 and the control module 102, the third switch module 109 is also used to control the communication between the second earphone 30 and the control module 102, the second switch module 108 is also used to control the first voltage conversion module 103 to charge the first earphone 20, and the fourth switch module 110 is also used to control the second voltage conversion module 104 to charge the second earphone 30. Furthermore, the first switch module 107 and the second switch module 108 cooperate to control the charging and communication of the first earphone 20 , and the third switch module 109 and the fourth switch module 110 cooperate to control the charging and communication of the second earphone 30 .

[0062] It should be noted that when the control module 102 detects that the first earphone 20 or the second earphone 30 is fully charged and no longer needs to be charged, the control module 102 controls the second switch module 108 and the fourth switch module 110 to disconnect, and controls the first switch module 107 and the third switch module 109 to turn on, so that the earphone charging box can subsequently accurately determine whether the earphone has been taken out and other operations.

[0063] In one embodiment of the present application, Figure 4As shown, the first switch module 107 includes a first switch S1, a first conductive end of the first switch S1 is electrically connected to the first voltage conversion module 103, a second conductive end of the first switch S1 is used to be electrically connected to the first earphone 20, and a control end of the first switch S1 is electrically connected to the control module 102. The second switch module 108 includes a second switch S2, a first conductive end of the second switch S2 is electrically connected to the first current detection module 105, a second conductive end of the second switch S2 is used to be electrically connected to the first earphone 20, and a control end of the second switch S2 is electrically connected to the control module 102. The third switch module 109 includes a third switch S3, a first conductive end of the third switch S3 is electrically connected to the second voltage conversion module 104, a second conductive end of the third switch S3 is used to be electrically connected to the second earphone 30, and a control end of the third switch S3 is electrically connected to the control module 102. The fourth switch module 110 includes a fourth switch S4 , a first conduction end of the fourth switch S4 is electrically connected to the second current detection module 106 , a second conduction end of the fourth switch S4 is electrically connected to the second earphone 30 , and a control end of the fourth switch S4 is electrically connected to the control module 102 .

[0064] Specifically, the first switch S1, the second switch S2, the third switch S3, and the fourth switch S4 are all electronic switches, and the control end of each switch is electrically connected to the control module 102, so each switch is controlled by the control module 102. When the control module 102 controls the first switch S1, the second switch S2, the third switch S3, and the fourth switch S4 to be closed (conducted), the earphone charging circuit 10 can charge the first earphone 20 and the second earphone 30. When the control module 102 needs to communicate with the first earphone 20 or the second earphone 30, the control module 102 controls the first switch S1 and the third switch S3 to be disconnected, and controls the second switch S2 and the fourth switch S4 to be turned on. At this time, the control module 102 can communicate with the first earphone 20 and the second earphone 30. Therefore, the first switch S1 is also used to control the communication between the first earphone 20 and the control module 102, the third switch S3 is also used to control the communication between the second earphone 30 and the control module 102, the second switch S2 is also used to control the first voltage conversion module 103 to charge the first earphone 20, and the fourth switch S4 is also used to control the second voltage conversion module 104 to charge the second earphone 30. In addition, the first switch S1 and the second switch S2 are used to control the charging and communication of the first earphone 20, and the third switch S3 and the fourth switch S4 are used to control the charging and communication of the second earphone 30.

[0065] It should be noted that the first switch S1, the second switch S2, the third switch S3 and the fourth switch S4 can be other electronic switch devices, and are not limited to a certain electronic switch device. The description of the working principle of the first switch S1, the second switch S2, the third switch S3 and the fourth switch S4 is similar to the principle of each switch module mentioned above. Here, the working principle of each corresponding switch module mentioned above can be referred to, and no excessive elaboration is given here.

[0066] In one embodiment of the present application, Figure 2 As shown, the earphone charging circuit 10 also includes a first load detection module 111 and a second load detection module 112. The first load detection module 111 is electrically connected to the control module 102 and the second switch module 108 respectively. The first load detection module 111 is used to be electrically connected to the first earphone 20. The second load detection module 112 is electrically connected to the control module 102 and the fourth switch module 110 respectively. The second load detection module 112 is used to be electrically connected to the second earphone 30.

[0067] Specifically, the first load detection module 111 is used to be electrically connected to the second end of the first earphone 20, and the second load detection module 112 is used to be electrically connected to the second end of the second earphone 30. When the first switch module 107 is turned on and the second switch module 108 is turned off, the first load detection module 111 is used to output a first detection signal to the control module 102 according to the first node voltage, and the control module 102 determines whether the first earphone 20 is taken out according to the first detection signal. It can be seen that the first detection signal is used to characterize the connection state between the first earphone 20 and the earphone charging circuit 10. When the third switch module 109 is turned on and the fourth switch module 110 is turned off, the second load detection module 112 is used to output a second detection signal to the control module 102 according to the second node voltage, and the control module 102 determines whether the second earphone 30 is taken out according to the second detection signal. It can be seen that the second detection signal is used to characterize the connection state between the second earphone 30 and the earphone charging circuit 10. Specifically, when the first switch module 107 is turned on and the second switch module 108 is turned off, and the first earphone 20 is not in a charging state, the first voltage conversion module 103 outputs a lower voltage (such as 3V), that is, the first node voltage (the voltage of the output interface) is a lower voltage. If the first earphone 20 is not taken out of the earphone charging box, the first load detection module 111 has power input and voltage is generated, and the control module 102 can determine that the first earphone 20 has not been taken out. On the contrary, if the first earphone 20 is not in the earphone charging box and has been taken out, the first load detection module 111 has no power input and no voltage is generated, and the control module 102 can determine that the first earphone 20 has been taken out. The principle of judging whether the second earphone 30 is taken out is similar to the principle of judging whether the first earphone 20 is taken out, and the above description can be referred to, and no further elaboration is given here.

[0068] The present application also discloses a headphone charging system. Figure 5 As shown, the earphone charging system includes a first earphone 20, a second earphone 30 and the above-mentioned earphone charging circuit 10, and the first earphone 20 and the second earphone 30 are both electrically connected to the control module 102, the first switch module 107, the second switch module 108, the third switch module 109 and the fourth switch module 110 in the earphone charging circuit 10.

[0069] Specifically, when the first switch module 107 and the second switch module 108 are both turned on, the earphone charging circuit 10 can charge the first earphone 20, and when the third switch module 109 and the fourth switch module 110 are both turned on, the earphone charging circuit 10 can charge the second earphone 30. When the first switch module 107 is turned off and the second switch module 108 is turned on, the control module 102 in the earphone charging circuit 10 can communicate with the first earphone 20, and when the third switch module 109 is turned off and the fourth switch module 110 is turned on, the control module 102 in the earphone charging circuit 10 can communicate with the second earphone 30. In addition, the first earphone 20 can determine whether the first earphone 20 is in the earphone charging box by detecting the change of the positive voltage of the charging port of the first earphone 20, and the second earphone 30 can determine whether the second earphone 30 is in the earphone charging box by detecting the change of the positive voltage of the charging port of the second earphone 30.

[0070] The earphone charging system adopts the above-mentioned earphone charging circuit 10 to significantly improve the charging efficiency and reduce energy loss. Since the first voltage conversion module 103 and the second voltage conversion module 104 directly output the voltage required by the earphone according to the control signal output by the control module 102, there is no need to perform additional voltage conversion inside the earphone, which not only simplifies the circuit design inside the earphone, but also reduces the energy loss during multiple conversions. In addition, this design can also increase the charging speed, extend the use time of the earphone, and enhance the user experience. In short, the earphone charging system achieves efficient and fast charging by optimizing the charging circuit design.

[0071] In one embodiment of the present application, Figure 5 As shown, the first earphone 20 includes a first unidirectional conduction module 201, a first battery module 202 and a first earphone system 203. The first unidirectional conduction module 201 is electrically connected to the first battery module 202, the first earphone system 203, the first switch module 107 and the control module 102 respectively, and the first battery module 202 is electrically connected to the first earphone system 203 and the second switch module 108 respectively.

[0072] Specifically, the first unidirectional conduction module 201 has a unidirectional conduction function and an isolation function, which is used to prevent the first battery voltage output by the first battery module 202 from being transmitted to the first switch module 107, and isolate the first battery module 202 from the charging port of the first earphone 20, so as to avoid the influence of the first battery module 202 on the communication of the charging port of the first earphone 20. The first earphone system 203 is used to detect the first interface voltage, and determine the placement state of the first earphone 20 according to the first interface voltage. Specifically, when the first earphone system 203 detects that the first interface voltage is zero, it is determined that the first earphone 20 is not in the earphone charging box. When the first earphone system 203 detects that the first interface voltage is a lower voltage, it is determined that the first earphone 20 is in the earphone charging box. If the first earphone 20 is in a charging state, the first interface voltage is higher than the voltage of the first battery module 202, or the first interface voltage is significantly higher than 3V, it is determined that the first earphone 20 is in a charging state. If the first earphone 20 stops charging, the earphone charging circuit 10 is in a load detection state, the first earphone 20 forms a voltage divider with the first load detection module 111, and the first earphone 20 detects that the first interface voltage is the same as when the first earphone 20 is placed in the charging box, and the voltage of the first battery module 202 reaches the full-charge voltage. At this time, the first earphone system 203 determines that the first battery module 202 of the first earphone 20 is fully charged. If the first earphone 20 is directly taken out during the charging process, the first earphone system 203 will detect that the first interface voltage disappears, and the first earphone system 203 will determine that the first earphone 20 is taken out.

[0073] In one embodiment of the present application, Figure 5 As shown, the second earphone 30 includes a second unidirectional conduction module 301, a second battery module 302 and a second earphone system 303. The second unidirectional conduction module 301 is electrically connected to the second battery module 302, the second earphone system 303, the third switch module 109 and the control module 102 respectively. The second battery module 302 is electrically connected to the second earphone system 303 and the fourth switch module 110 respectively.

[0074] Specifically, the second unidirectional conduction module 301 has a unidirectional conduction function and an isolation function, which is used to prevent the second battery voltage output by the second battery module 302 from being transmitted to the third switch module 109, and isolate the second battery module 302 from the charging port of the second earphone 30, so as to avoid the influence of the second battery module 302 on the communication of the charging port of the second earphone 30. The second earphone system 303 is used to detect the second interface voltage, and determine the placement state of the second earphone 30 according to the second interface voltage. The specific working principle is the same as that of the first earphone 20, and the description of the first earphone 20 can be referred to, and no further elaboration is given here.

[0075] In one embodiment of the present application, Figure 6As shown, the first unidirectional conduction module 201 includes a first diode D1, the anode of the first diode D1 is electrically connected to the first end of the first earphone system 203 and the first switch module 107, and the cathode of the first diode D1 is electrically connected to the second end of the first earphone system 203 and the first battery module 202. The second unidirectional conduction module 301 includes a second diode D2, the anode of the second diode D2 is electrically connected to the first end of the second earphone system 303 and the third switch module 109, and the cathode of the second diode D2 is electrically connected to the second end of the second earphone system 303 and the second battery module 302.

[0076] Specifically, the first diode D1 and the second diode D2 both have unidirectional conduction and isolation functions. The first diode D1 is used to prevent the first battery voltage output by the first battery module 202 from being transmitted to the first switch module 107, and isolate the first battery module 202 from the charging port of the first earphone 20, so as to avoid the influence of the first battery module 202 on the communication of the charging port of the first earphone 20. The second diode D2 is used to prevent the second battery voltage output by the second battery module 302 from being transmitted to the third switch module 109, and isolate the second battery module 302 from the charging port of the second earphone 30, so as to avoid the influence of the second battery module 302 on the communication of the charging port of the second earphone 30.

[0077] It should be noted that when the earphone charging circuit 10 charges the first earphone 20, the maximum output voltage is pre-set according to the charging voltage of the first battery module 202 in the first earphone 20, wherein the setting method is the sum of the charging voltage and the voltage drop of the first diode D1. Similarly, when the earphone charging circuit 10 charges the second earphone 30, the maximum output voltage is also pre-set according to the sum of the charging voltage of the second battery module 302 and the voltage drop of the second diode D2.

[0078] The present application also discloses an electronic device, including the above-mentioned earphone charging system. The electronic device adopts the above-mentioned earphone charging system to achieve efficient and fast charging effect, further enhancing the overall performance of the electronic device.

[0079] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. An earphone charging circuit, characterized in that: It includes a power module, a control module, a first voltage conversion module and a second voltage conversion module, wherein the first voltage conversion module is electrically connected to the power module and the control module respectively, and the second voltage conversion module is electrically connected to the power module and the control module respectively, and the first voltage conversion module and the control module are both used to be electrically connected to a first earphone, and the second voltage conversion module and the control module are both used to be electrically connected to a second earphone; The control module is used to monitor the first power of the first earphone and the second power of the second earphone, and output a first control signal to the first voltage conversion module according to the first power, and output a second control signal to the second voltage conversion module according to the second power; the first voltage conversion module is used to convert the power voltage output by the power module into the first voltage required by the first earphone according to the first control signal; the second voltage conversion module is used to convert the power voltage into the second voltage required by the second earphone according to the second control signal.

2. The earphone charging circuit according to claim 1, characterized in that: The earphone charging circuit further includes a first current detection module and a second current detection module, wherein the first current detection module and the second current detection module are both electrically connected to the control module, the first current detection module is used to be electrically connected to the first earphone, and the second current detection module is used to be electrically connected to the second earphone; The first current detection module is used to detect a first current and output a first current signal to the control module, wherein the first current is a charging current of the first earphone; the second current detection module is used to detect a second current and output a second current signal to the control module, wherein the second current is a charging current of the second earphone.

3. The earphone charging circuit according to claim 2, characterized in that: The first current detection module includes a first resistor and a first amplifier, wherein the first end of the first resistor is electrically connected to the first input end of the first amplifier, the first end of the first resistor is used to be electrically connected to the first earphone, the second end of the first resistor is electrically connected to the second input end of the first amplifier, and the output end of the first amplifier is electrically connected to the control module; The second current detection module includes a second resistor and a second amplifier, the first end of the second resistor is electrically connected to the first input end of the second amplifier, the first end of the second resistor is used to be electrically connected to the second earphone, the second end of the second resistor is electrically connected to the second input end of the second amplifier, and the output end of the second amplifier is electrically connected to the control module.

4. The earphone charging circuit according to claim 2, characterized in that: The earphone charging circuit further includes a first switch module, a second switch module, a third switch module and a fourth switch module, wherein the first switch module is used to be connected between the first voltage conversion module and the first earphone, the second switch module is used to be connected between the first current detection module and the first earphone, the third switch module is used to be connected between the second voltage conversion module and the second earphone, and the fourth switch module is used to be connected between the second current detection module and the second earphone, and the first switch module, the second switch module, the third switch module and the fourth switch module are all electrically connected to the control module; When the first switch module is turned on according to the first switch signal output by the control module, and the second switch module is turned on according to the second switch signal output by the control module, the control module is used to output a first control signal to the first voltage conversion module according to the first electric quantity; the first voltage conversion module is used to convert the power supply voltage into the first voltage according to the first control signal; the first current detection module is used to detect the first current and output the first current signal to the control module; When the third switch module is turned on according to the third switch signal output by the control module and the fourth switch module is turned on according to the fourth switch signal output by the control module, the control module is used to output a second control signal to the second voltage conversion module according to the second electrical quantity; the second voltage conversion module is used to convert the power supply voltage into the second voltage according to the second control signal; the second current detection module is used to detect the second current and output the second current signal to the control module.

5. The earphone charging circuit according to claim 4, characterized in that: The first switch module comprises a first switch, a first conducting end of the first switch is electrically connected to the first voltage conversion module, a second conducting end of the first switch is used to be electrically connected to the first earphone, and a control end of the first switch is electrically connected to the control module; The second switch module includes a second switch, a first conduction end of the second switch is electrically connected to the first current detection module, a second conduction end of the second switch is used to be electrically connected to the first earphone, and a control end of the second switch is electrically connected to the control module; The third switch module comprises a third switch, a first conducting end of the third switch is electrically connected to the second voltage conversion module, a second conducting end of the third switch is used to be electrically connected to the second earphone, and a control end of the third switch is electrically connected to the control module; The fourth switch module includes a fourth switch, a first conduction end of the fourth switch is electrically connected to the second current detection module, a second conduction end of the fourth switch is used to be electrically connected to the second earphone, and a control end of the fourth switch is electrically connected to the control module.

6. The earphone charging circuit according to claim 4, characterized in that: The earphone charging circuit further includes a first load detection module and a second load detection module, the first load detection module is electrically connected to the control module and the second switch module respectively, the first load detection module is used to be electrically connected to the first earphone, the second load detection module is electrically connected to the control module and the fourth switch module respectively, and the second load detection module is used to be electrically connected to the second earphone; When the first switch module is turned on and the second switch module is turned off, the first load detection module is used to output a first detection signal to the control module according to a first node voltage, and the first node voltage is a voltage at a common end of the first load detection module and the second switch module; when the third switch module is turned on and the fourth switch module is turned off, the second load detection module is used to output a second detection signal to the control module according to a second node voltage, and the second node voltage is a voltage at a common end of the second load detection module and the fourth switch module.

7. An earphone charging system, characterized in that: The invention comprises a first earphone, a second earphone and the earphone charging circuit according to any one of claims 1 to 6, wherein the first earphone and the second earphone are electrically connected to a control module, a first switch module, a second switch module, a third switch module and a fourth switch module in the earphone charging circuit.

8. The earphone charging system according to claim 7, characterized in that: The first earphone comprises a first unidirectional conduction module, a first battery module and a first earphone system, wherein the first unidirectional conduction module is electrically connected to the first battery module, the first earphone system, the first switch module and the control module respectively, and the first battery module is electrically connected to the first earphone system and the second switch module respectively; The first unidirectional conduction module is used to prevent the first battery voltage output by the first battery module from being transmitted to the first switch module; the first earphone system is used to detect a first interface voltage and determine the position information of the first earphone according to the first interface voltage; wherein the first interface voltage is the voltage of the first end of the first earphone; The second earphone comprises a second unidirectional conduction module, a second battery module and a second earphone system, the second unidirectional conduction module is electrically connected to the second battery module, the second earphone system, the third switch module and the control module respectively, and the second battery module is electrically connected to the second earphone system and the fourth switch module respectively; The second unidirectional conduction module is used to prevent the second battery voltage output by the second battery module from being transmitted to the third switch module; the second earphone system is used to detect the second interface voltage and determine the position information of the second earphone according to the second interface voltage; wherein the second interface voltage is the voltage of the first end of the second earphone.

9. The earphone charging system according to claim 8, characterized in that: The first unidirectional conduction module comprises a first diode, an anode of the first diode is electrically connected to the first end of the first earphone system and the first switch module respectively, and a cathode of the first diode is electrically connected to the second end of the first earphone system and the first battery module respectively; The second unidirectional conduction module includes a second diode, an anode of the second diode is electrically connected to the first end of the second earphone system and the third switch module respectively, and a cathode of the second diode is electrically connected to the second end of the second earphone system and the second battery module respectively.

10. An electronic device, characterized in that: The earphone charging system comprises the one described in any one of claims 7 to 9.

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