Charging management circuit and earphone charging box

Abstract

The utility model discloses a charging management circuit and an earphone charging box, the charging management circuit comprises a control module, the control module comprises an input end, an output end, a temperature monitoring end and a current adjusting end, the input end is used for being electrically connected with a power supply, and the output end is used for being electrically connected with a to-be-charged Bluetooth earphone; one end of the thermosensitive load module is electrically connected with the temperature monitoring end and a first pole of the switch module, the other end of the thermosensitive load module is grounded, one end of the main load module and one end of the auxiliary load module are electrically connected with the current adjusting end, and the other end of the main load module is grounded. The auxiliary load module is electrically connected with the second pole of the switch module, and the other end of the main load module and the third pole of the switch module are grounded. According to the invention, the response delay of the earphone charging box can be reduced, and the charging efficiency of the earphone charging box on the Bluetooth earphone is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of charge management, and in particular to a charge management circuit and earphone charging box. BACKGROUND

[0002] With the rapid development of the market of True Wireless Stereo (TWS) Bluetooth earphones, users have higher requirements for the quality, safety and use experience of earphones. In particular, it has become a key challenge for design and manufacturing to ensure that earphones placed in the box can be safely and stably charged at different temperatures.

[0003] In the related art, the current temperature of the charging box is detected in real time by a micro control unit, and the size of the current flowing into the charging box is adjusted according to the current temperature. However, such a charge management method relies on software and hardware as support, and once the task scheduling of the micro control unit is improper, response delay will occur, thereby causing low charging efficiency of the earphone charging box. UTILITY MODEL CONTENT

[0004] The embodiments of the present application provide a charge management circuit and earphone charging box, aiming to reduce the response delay of the earphone charging box and improve the charging efficiency of the earphone charging box on Bluetooth earphones.

[0005] In a first aspect, the embodiments of the present application provide a charge management circuit, comprising:

[0006] a control module, the control module comprising an input end, an output end, a temperature monitoring end and a current adjustment end, the input end being configured to be electrically connected with a power supply, and the output end being configured to be electrically connected with a Bluetooth earphone to be charged;

[0007] a switch module, an auxiliary load module, a main load module and a thermosensitive load module, one end of the thermosensitive load module being electrically connected with the temperature monitoring end and a first pole of the switch module, one end of the main load module and the auxiliary load module being electrically connected with the current adjustment end, and the other end of the auxiliary load module being electrically connected with a second pole of the switch module.

[0008] According to some embodiments of the present application, the control module is a first control module, the switch module is a first switch module, the auxiliary load module is a first auxiliary load module, the main load module is a first main load module, and the thermosensitive load module is a first thermosensitive load module.

[0009] The first control module comprises a first input end, a first output end, a first temperature monitoring end and a first current adjustment end, the first input end being configured to be electrically connected with a power supply, and the first output end being configured to be electrically connected with a Bluetooth earphone to be charged;

[0010] One end of the first thermosensitive load module is electrically connected with the first temperature monitoring end and the first pole of the first switch module, the other end of the first thermosensitive load module is grounded, one end of the first main load module and the first auxiliary load module is electrically connected with the first current adjusting end, the first auxiliary load module is electrically connected with the second pole of the first switch module, the other end of the first main load module and the third pole of the first switch module are grounded.

[0011] According to some embodiments of the present application, if the first thermosensitive load module detects that the current first temperature from the first temperature monitoring end is less than the first temperature threshold, the first switch module is turned on, the first main load module and the first auxiliary load module are connected to the first current adjusting end, and the first current adjusting end is connected to the first total resistance value;

[0012] If the first thermosensitive load module detects that the current first temperature from the first temperature monitoring end is greater than the first temperature threshold, the first switch module is turned off, the first main load module is connected to the first current adjusting end, and the first current adjusting end is connected to the second total resistance value;

[0013] The first total resistance value is less than the second total resistance value.

[0014] According to some embodiments of the present application, the first load element and the second load element are connected in parallel, one end of the first load element and the second load element is electrically connected with the first pole of the first switch module, the other end of the first load element is electrically connected with the first temperature monitoring end, and the other end of the second load element is grounded.

[0015] According to some embodiments of the present application, the first switch module is an N-channel field effect tube, one end of the N-channel field effect tube is electrically connected with one end of the first thermosensitive load module, the drain of the N-channel field effect tube is electrically connected with one end of the first auxiliary load module, and the source of the N-channel field effect tube is grounded.

[0016] According to some embodiments of the present application, the control module is a second control module, the switch module is a second switch module, the auxiliary load module is a second auxiliary load module, the main load module is a second main load module, and the thermosensitive load module is a second thermosensitive load module.

[0017] The second control module comprises a second input end, a second output end, a second temperature monitoring end and a second current adjusting end, the second input end is used for being electrically connected with a power supply, and the second output end is used for being electrically connected with a Bluetooth earphone to be charged.

[0018] One end of the second thermal sensitive load module is electrically connected with the second temperature monitoring terminal and the first pole of the second switch module, the other end of the second thermal sensitive load module is grounded, one end of the second main load module and the second auxiliary load module is electrically connected with the second current adjusting terminal, the second auxiliary load module is electrically connected with the second pole of the second switch module, the other end of the second main load module and the third pole of the second switch module are grounded.

[0019] According to some embodiments of the present application, if the second thermal sensitive load module detects that the current second temperature from the second temperature detecting terminal is less than the second temperature threshold, the second switch module is turned off, the second main load module is connected to the second current adjusting terminal, and the second current adjusting terminal is connected to a third total resistance value;

[0020] If the second thermal sensitive load module detects that the current second temperature from the second temperature detecting terminal is greater than the second temperature threshold, the second switch module is turned on, the second main load module and the second auxiliary load module are connected to the second current adjusting terminal, and the second current adjusting terminal is connected to a fourth total resistance value;

[0021] The third total resistance value is greater than the fourth total resistance value.

[0022] According to some embodiments of the present application, the second load element and the fourth load element are further connected in parallel, one end of the third load element and the fourth load element is electrically connected with the first pole of the second switch module, the other end of the third load element is electrically connected with the second temperature monitoring terminal, and the other end of the fourth load element is grounded.

[0023] According to some embodiments of the present application, the second switch module is a P-channel field effect transistor, one end of the second thermal sensitive load module is electrically connected with the gate of the P-channel field effect transistor, one end of the second auxiliary load module is electrically connected with the source of the P-channel field effect transistor, and the drain of the P-channel field effect transistor is grounded.

[0024] In the second aspect, the embodiments of the present application further provide an earphone charging box, which comprises the charging management circuit in any one of the first aspect, the earphone charging box comprises a charging bin, the charging bin comprises a first conductive contact, when a Bluetooth earphone to be charged is placed in the charging bin and a second conductive contact of the Bluetooth earphone is electrically connected with the first conductive contact, the earphone charging box charges the Bluetooth earphone.

[0025] The embodiments of the present application at least have the following beneficial effects: the charging management circuit provided by the embodiments of the present application comprises a control module, the control module comprises an input end, an output end, a temperature monitoring end and a current adjusting end, the input end is used for electrical connection with a power supply, and the output end is used for electrical connection with a Bluetooth earphone to be charged; a switch module, an auxiliary load module, a main load module and a thermosensitive load module, one end of the thermosensitive load module is electrically connected with the temperature monitoring end and a first pole of the switch module, the other end of the thermosensitive load module is grounded, one end of the main load module and the auxiliary load module is electrically connected with the current adjusting end, the auxiliary load module is electrically connected with a second pole of the switch module, and the other end of the main load module and a third pole of the switch module are grounded. The present application can reduce the response delay of the earphone charging box and improve the charging efficiency of the earphone charging box on the Bluetooth earphone. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 FIG. 1 is a circuit structure schematic diagram of a charging management circuit provided by an embodiment of the present application;

[0027] Figure 2 FIG. 2 is a first circuit schematic diagram of a charging management circuit provided by an embodiment of the present application;

[0028] Figure 3 FIG. 3 is a second circuit schematic diagram of a charging management circuit provided by an embodiment of the present application;

[0029] REFERENCE SIGNS:

[0030] The control module 110, the input end 111, the output end 112, the temperature monitoring end 113, the current adjusting end 114, the switch module 120, the auxiliary load module 130, the main load module 140, the thermosensitive load module 150, the first temperature monitoring end 213, the first current adjusting end 214, the first switch module 220, the first auxiliary load module 230, the first main load module 240, the first thermosensitive load module 250, the second temperature monitoring end 313, the second current adjusting end 314, the second switch module 320, the second auxiliary load module 330, the second main load module 340, and the second thermosensitive load module 350. DETAILED DESCRIPTION

[0031] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right and the like, is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0032] It should be understood that in the description of the embodiments of the present application, if one or more of the same meanings are intended, the meaning of multiple (or multiple items) is two or more, greater than, less than, more than, etc. Understand that the number is not included, above, below, etc. Understand that the number is included. If there is a description of "first", "second", etc. It is only used to distinguish the purpose of the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the relationship between the indicated technical features.

[0033] In the description of the embodiments of the present application, unless otherwise explicitly limited, the words such as setting, installation, connection, etc. should be broadly understood, and those skilled in the art can reasonably determine the specific meaning of the above words in the embodiments of the present application in combination with the specific content of the technical solutions.

[0034] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0035] The following will be described in combination with Figures 1 to 3 The embodiments of the present application are further described, wherein the Figures 1 to 3 of each structure are mentioned in the description.

[0036] With the rapid development of the true wireless stereo Bluetooth earphone market, users have higher requirements for the quality, safety and use experience of earphones. In particular, the earphone charging box can ensure that the earphones placed in the box can be safely and stably charged at different temperatures, which becomes a key challenge for design and manufacturing.

[0037] In the related art, the current temperature of the charging box is detected in real time by a micro control unit, and the size of the current flowing into the charging box is adjusted according to the current temperature. However, such a charging management method is supported by software and hardware, and once the task scheduling of the micro control unit is improper, response delay will occur, thereby causing low charging efficiency of the earphone charging box.

[0038] Based on this, the embodiments of the present application propose a charging management circuit and an earphone charging box, which will be described in detail below, and the beneficial effects of the embodiments of the present application will gradually appear.

[0039] As Figure 1 shown, Figure 1is a circuit structure schematic diagram of the charging management circuit provided by an embodiment of the present application, wherein, for the convenience of description, the charging management circuit can also be referred to as a circuit in the following, and the charging management circuit comprises:

[0040] The control module 110 comprises an input end 111, an output end 112, a temperature monitoring end 113 and a current adjusting end 114. The input end 111 is used for electrical connection with the power supply. The output end 112 is used for electrical connection with the Bluetooth earphone to be charged.

[0041] The switch module 120, the auxiliary load module 130, the main load module 140 and the thermistor load module 150. One end of the thermistor load module 150 is electrically connected with the temperature monitoring end 113 and the first pole of the switch module 120. The other end of the thermistor load module 150 is grounded. One end of the main load module 140 and the auxiliary load module 130 is electrically connected with the current adjusting end 114. The other end of the auxiliary load module 130 is electrically connected with the second pole of the switch module 120. The other end of the main load module 140 and the third pole of the switch module 120 are grounded.

[0042] The control module 110 is essentially an electronic component for managing and controlling the current flowing into the charging device. The control module 110 can comprise a single controller or a controller and other components electrically connected with the controller. The other components can be load components such as resistors, capacitors, etc. The present application does not limit this.

[0043] Further, the controller can be a System on Chip (SoC), a Microcontroller Unit (MCU), a Programmable Logic Controller (PLC), a Digital Signal Processor (DSP), a Field-Programmable Gate Array (FPGA), a lithium battery charging management chip, etc. The specific type of controller used can be adjusted according to actual conditions, and the present application does not limit this.

[0044] Further, taking the control module 110 comprising a single controller as an example, the controller comprises an input end 111, an output end 112, a temperature monitoring end 113 and a current adjusting end 114. Figure 1As shown, the input end 111 of the control module 110 is used to be connected with a power supply, which can be a lithium ion battery, a lithium polymer battery, a wireless charging coil, etc. specially used to provide working current for the controller, and the specific type of the power supply can be set according to actual conditions, and the embodiments of the present application do not limit this. The output end 112 of the control module 110 is used to be electrically connected with the Bluetooth headset to be charged.

[0045] It should be noted that the controller in the embodiments of the present application is a special charging controller specially designed for charging (such as a lithium battery charging management chip), and the output end 112 thereof can usually directly power the Bluetooth headset to be charged. Moreover, the "electrical connection" in the embodiments of the present application is also called "electrical connection", which is a connection relationship expression for displaying the line structure of a product in order to show the line characteristics. It can be understood as a form of connection between different components in the line structure through a physical line that can transmit electrical signals such as a copper foil of a printed circuit board (PCB) or a wire. It can be understood that the two electronic components of the "electrical connection" can be directly connected, or indirectly connected by setting other electronic components therebetween.

[0046] Further, the control module 110 further includes two functional ports of a temperature monitoring end 113 and a current adjusting end 114. The temperature monitoring end 113 is electrically connected with a thermally sensitive load module 150, the resistance value of the thermally sensitive load module 150 can change with the change of temperature, and then the thermally sensitive load module 150 can determine the total resistance value connected to the current adjusting end 114 by changing the conduction of the switch module 120. Based on this, the embodiments of the present application can adjust the working current at different temperatures: under normal temperature, the charging current flowing into the Bluetooth headset to be charged is large; under abnormal temperature, the charging current flowing into the Bluetooth headset is small. In this way, the Bluetooth headset does not stop charging under abnormal temperature, but continues to charge the charging device in the form of small current charging. In the process of small current charging, the charging efficiency of the charging device is ensured by continuously supplying power to the charging device, and at the same time, in the process of small current charging, the heat generated by the Bluetooth headset and the circuit is small, which facilitates the temperature drop of the Bluetooth headset and the circuit. When the temperature drops to the normal temperature, the large current charging of the Bluetooth headset is restored.

[0047] It should be noted that the controller usually further includes other functional ports, and each functional port can be connected with different components according to actual needs and realize corresponding different functions. The embodiments of the present application do not limit the functional characteristics possessed by the other functional ports of the controller, and the specific functions can be set according to actual conditions.

[0048] The thermal load module 150 is a circuit module that adjusts its operating state according to temperature changes. The core component of the thermal load module 150 is a thermistor. The thermistor can be a negative temperature coefficient (NTC) thermistor or a positive temperature coefficient (PTC) thermistor: the resistance of an NTC thermistor decreases as temperature increases, while the resistance of a PTC thermistor increases as temperature increases. Furthermore, the thermal load module 150 can also be composed of multiple thermistor components connected in series or parallel to achieve a more precise temperature sensing range and response speed.

[0049] It should be noted that during the charging process of the charging device, the normal temperature range is typically defined as 18°C ​​to 32°C, and the abnormal temperature range is 33°C to 45°C. Of course, the normal and abnormal temperatures can be set according to actual conditions, and this embodiment does not impose any limitations on this. For different set normal and abnormal temperatures, thermistor load modules 150 with different operating characteristics (different resistance values ​​at different temperatures) are selected accordingly.

[0050] Additionally, a temperature above 45°C can be set as a high temperature. When the controller detects that the Bluetooth headset and / or circuit temperature has entered a high temperature state, in order to ensure the safety of each component in the circuit and extend the service life of each component, the controller will block the flow of any current until the temperature drops significantly or the user manually resets the controller, at which point the controller will allow the Bluetooth headset to charge again.

[0051] Furthermore, the thermal load module 150 is also electrically connected to the switch module 120, and the switch module 120 is also electrically connected to the auxiliary load module 130. Here, it is necessary to... Figure 1 It should be noted that, Figure 1 The diagram shows that the thermal load module 150 includes three connection terminals, which are derived from the two actual physical connection terminals of the thermal load module 150. Figure 1 This is for ease of understanding only and does not imply that the thermal load module 150 includes three physical connection terminals.

[0052] Furthermore, the circuit in this embodiment also includes a main load module 140 and an auxiliary load module 130. Both the main load module 140 and the auxiliary load module 130 are electrically connected to the current adjustment terminal 114 to affect the total resistance value connected to the current adjustment terminal 114. One end of the switch module 120 is also electrically connected to the auxiliary load module 130. Temperature can affect the resistance value of the thermistor load module 150, thereby changing the opening and closing state of the switch module 120. Different opening and closing states of the switch module 120 can affect the connection status of the auxiliary load module 130. Therefore, the total resistance value connected to the current adjustment terminal 114 can change with different connection statuses of the auxiliary load module 130. The first total resistance value connected under normal temperature results in a larger operating current output by the output terminal 112, while the first total resistance value connected under abnormal temperature results in a smaller operating current output by the output terminal 112. Thus, even under abnormal temperature, the circuit will not stop charging the charging device, improving charging efficiency.

[0053] The switch module 120 can switch the current of its branch under different states according to the instructions of the control module 110. The main load module 140 is the main load connected to the current adjustment terminal 114, and is connected to the current adjustment terminal 114 under both normal and abnormal temperatures; the auxiliary load module 130 is a dynamically adjustable load connected to the current adjustment terminal 114, and is connected to the current adjustment terminal 114 under both normal and abnormal temperatures.

[0054] Compared to related technologies that involve burning the control program into the control module 110 and controlling the current flowing into the charging device via Input / Output (I / O ports), this application embodiment does not involve any software improvements to the first control module 110. By making pure hardware improvements to the first control module 110, the charging efficiency of the charging device is improved while ensuring the safety of the charging device and circuitry. Furthermore, when the temperature changes, the first control module 110 does not need to go through complex instruction execution and software layer scheduling to change the charging current, resulting in more timely and real-time control. In addition, the pure hardware control improvement method also reduces research and development costs.

[0055] like Figure 2 As shown, Figure 2 This is a first circuit diagram of a charging management circuit provided in one embodiment of this application. According to some embodiments of this application, the control module 110 is a first control module, the switch module is a first switch module 220, the auxiliary load module is a first auxiliary load module 230, the main load module is a first main load module 240, and the thermal load module is a first thermal load module 250.

[0056] The first control module comprises a first input end, a first output end, a first temperature monitoring end 213 and a first current adjusting end 214, the first input end is used for electrically connecting with the power supply, and the first output end is used for electrically connecting with the Bluetooth earphone to be charged.

[0057] One end of the first thermal load module 250 is electrically connected with the first temperature monitoring end 213 and the first pole of the first switch module 220, the other end of the first thermal load module 250 is grounded, one end of the first main load module 240 and the first auxiliary load module 230 is electrically connected with the first current adjusting end 214, the first auxiliary load module 230 is electrically connected with the second pole of the first switch module 220, and the other end of the first main load module 240 is grounded.

[0058] If the first thermal load module 250 detects that the current first temperature from the first temperature monitoring end 213 is less than the first temperature threshold, the first switch module 220 is turned on, the first main load module 240 and the first auxiliary load module 230 are connected to the first current adjusting end 214, and the first current adjusting end 214 is connected to the first total resistance value;

[0059] If the first thermal load module 250 detects that the current first temperature from the first temperature monitoring end 213 is greater than the first temperature threshold, the first switch module 220 is turned off, the first main load module 240 is connected to the first current adjusting end 214, and the first current adjusting end 214 is connected to the second total resistance value;

[0060] The first total resistance value is less than the second total resistance value.

[0061] According to some embodiments of the present application, the working current output by the first output end of the first control module decreases with the increase of the total resistance value connected by the current adjusting end (the first charging scheme). In this case:

[0062] The first input end of the first control module is used for receiving power supply from the power supply, and the first output end is used for electrically connecting with the Bluetooth earphone to be charged, that is, the functional characteristics of the first control module are similar to those of the control module, which will not be repeated here. In addition, the functions of the various ends of the first control module are similar to those of the control module, the functional characteristics of the first thermal load module 250 are similar to those of the thermal load module, the functional characteristics of the first switch module 220 are similar to those of the switch module, the functional characteristics of the first main load module 240 are similar to those of the main load module, and the functional characteristics of the first auxiliary load module 230 are similar to those of the auxiliary load module. Therefore, the functional characteristics of each functional module will not be repeated here. The specific embodiments of the first charging scheme will be described in detail as follows:

[0063] According to some embodiments of this application, it also includes a first static load module, the first end of which is electrically connected to the first temperature monitoring terminal 213, the second end of which is electrically connected to the first pole of the first switch module 220, and the third end of which is grounded.

[0064] like Figure 2 As shown, the first static load module acts as a constant electrical path, ensuring that even if the resistance of the first thermal load module 250 changes due to temperature variations, Figure 2 The overall circuit shown can still maintain a certain level of stability and reliability.

[0065] Specifically, when the charging ambient temperature rises, the resistance of the first thermal load module 250 decreases accordingly (taking NTC as an example). When the first thermal load module 250 detects that the current first temperature from the first temperature detection terminal 213 is less than the first temperature threshold, the voltage U between the gate of the first thermal load module 250 and the gate of the first switching module 220 decreases. G1 This changes the on / off state of the first switch module 220. Simultaneously, as the resistance of the first thermal load module 250 decreases, the instantaneous current in the electrical path containing the first thermal load module 250 increases accordingly. Adding a first static load module can prevent a sudden increase in the instantaneous current flowing through the first switch module 220, thereby protecting the first switch module 220 and other related components from potential damage and improving charging stability.

[0066] It is understandable that, in some embodiments, the design of the first static load module can be more complex to adapt to different application scenarios. For example, the first static load module can be selected from resistors with a specific temperature coefficient, which can provide relatively stable load characteristics at different temperatures, further optimizing temperature sensing and current regulation performance. Furthermore, the first static load module can also be designed as an adjustable load, allowing users to adjust its resistance value according to actual usage conditions to achieve optimal charging performance.

[0067] In addition, to improve the overall efficiency and response speed of the system, fast-blow fuses or other forms of overcurrent protection devices can be integrated into the first static load module. Once an abnormally high current is detected, these protection devices can immediately cut off the power supply to prevent potential short circuits or fires. Alternatively, a voltage detection circuit can be added to monitor the voltage difference across the first static load module in real time and trigger alarms or take other safety measures when necessary, ensuring the safe and controllable charging process.

[0068] According to some embodiments of the present application, the first static load module comprises a first load element and a second load element connected in parallel, one end of the first load element and the second load element are electrically connected to the first pole of the first switch module 220, the other end of the first load element is electrically connected to the first temperature monitoring terminal 213, and the other end of the second load element and the third pole of the first switch module 220 are both grounded.

[0069] As shown in Figure 2 , the first load element is a resistor R15, and the second load element is a resistor R16. In the embodiments of the present application, the first load element and the second load element are connected in parallel, of course, the first load element and the second load element can also be connected in series; in addition to the first load element and the second load element, the first static load module can also include only one load element, or include more than two load elements, the connection mode of each load element forming the first static load module can be set according to actual conditions, and the embodiments of the present application do not limit this.

[0070] Further, the resistance values of the first load element and the second load element are usually set to be higher than the first static load module, so the first load element and the second load element will be the influencing factors of the first total resistance value of the first current adjusting terminal 214: the smaller the first total resistance value, the greater the working current output by the first output terminal.

[0071] As shown in Figure 2 , the first switch module 220 is an N-channel MOSFET (also known as "NMOS tube"), the gate (G pole) of the N-channel MOSFET is electrically connected to one end of the first thermal load module 250, the drain (D pole) of the N-channel MOSFET is electrically connected to one end of the first auxiliary load module 230, and the source (S pole) of the N-channel MOSFET is grounded.

[0072] Among them, the NMOS tube is a kind of semiconductor device that uses electric field effect to control current, when the gate of the NMOS tube receives a high level signal (i.e. U G1The first switch module 220 is turned on when the voltage difference between the first input terminal 212 and the first output terminal 213 is greater than the first threshold voltage value, at which time the current is allowed to flow from the drain to the source. In the first charging scheme, the NMOS transistor is selected to have a low threshold voltage, and the forward voltage when turned on is greater than 0.5 volts (V); the first thermally sensitive load module 250 is selected to be an NTC resistor, which has a resistance of about 10 kilo (K) ohms (Ω) at 25°C and a resistance of about 7.5 KΩ at 33°C; the resistance of the first load element is set to be about 600 KΩ, and the resistance of the second load element is set to be about 2.7 mega (M)Ω; under this setting, the voltage difference of the first switch module 220 at normal temperature (25°C) is about 0.66 V, which satisfies the turn-on condition of the first switch module 220, at which time the first switch module 220 is turned on, and the first current adjustment terminal 214 is connected to the first total resistance, which is related to the resistances of the first thermally sensitive load module 250, the first static load module, the first switch module 220 (which can be ignored), the first main load module 240, and the first auxiliary load module 230, and the first main load module 240 and the first auxiliary load module 230 are connected in parallel to the first current adjustment terminal 214.

[0073] Under this setting, the voltage difference of the first switch module 220 at abnormal temperature (33°C) is about 0.49 V (less than 0.5 V), which does not satisfy the turn-on condition of the first switch module 220, at which time the first switch module 220 is turned off, and the first current adjustment terminal 214 is connected to the second total resistance, which is related to the resistances of the first thermally sensitive load module 250, the first static load module, the first switch module 220 (which can be ignored), and the first main load module 240. Since the total resistance when two load modules are connected in parallel is less than the total resistance of a single load module, i.e., the first total resistance is less than the second total resistance, the second total resistance connected to the first current adjustment terminal 214 at abnormal temperature is greater than that at normal temperature, and thus the working current output by the first output terminal is reduced. In practical applications, when the first control module with the characteristics of the first charging implementation scheme is used, the first output terminal outputs a first charging current of 333 milliampere (mA) to the charging device at normal temperature, and the first output terminal outputs a second charging current of 167 mA to the charging device at abnormal temperature, and the first charging current > the second charging current; it can be seen that a large current is used to charge the charging device at normal temperature, and a small current is used to charge the charging device at abnormal temperature, which ensures the charging efficiency of the charging device.

[0074] Further, it needs to be explained that the reason why the NMOS tube is selected as the first switch module 220 in the embodiments of the present application is that the resistance between the drain and the source of the NMOS tube is very low in the on state, which can usually reach a few milliohms to a few tens of milliohms, which means that the on loss of the NMOS tube is very small in a large current application, thereby being able to significantly improve the overall efficiency of the circuit; and because the on resistance is low, the heat generated by the NMOS tube when it is on is less, reducing the heat dissipation requirement, simplifying the thermal management design, and reducing the cost.

[0075] Further, the first switch module 220 can also be other types of components, for example, the first switch module 220 can also be, for example, an NPN type triode, etc. The specific component type adopted by the first switch module 220 in the embodiments of the present application is not limited, and can be adaptively adjusted according to the actual situation.

[0076] It can be understood that in some embodiments, in order to improve the temperature detection accuracy and reliability, an additional filtering circuit or compensation circuit can also be added to the first temperature monitoring end 213 to eliminate the influence of noise interference and temperature drift. For example, a low-pass filter can be added to smooth the temperature signal, or a temperature compensation circuit can be used to correct the nonlinear characteristics of the thermally sensitive load module at different temperatures, so that the entire system is more stable and reliable.

[0077] It can be understood that in some embodiments, the performance of the first switch module 220 is enhanced by introducing an external drive circuit. For example, a gate driver can be added to the first switch module 220 to provide sufficient drive current and faster switching speed, especially in high-frequency application occasions, which can effectively reduce the loss of the first switch module 220 and improve the overall conversion efficiency. At the same time, fault detection and diagnosis functions such as short circuit protection and overcurrent protection can also be integrated, making the charge management circuit of the embodiments of the present application more reliable.

[0078] As shown in Figure 3 , Figure 3 is a second circuit schematic diagram of a charge management circuit provided by an embodiment of the present application. According to some embodiments of the present application, the control module 110 is a second control module, the switch module is a second switch module 320, the auxiliary load module is a second auxiliary load module 330, the main load module is a second main load module 340, and the thermally sensitive load module is a second thermally sensitive load module 350.

[0079] The second control module includes a second input end, a second output end, a second temperature monitoring end 313, and a second current adjustment end 314. The second input end is electrically connected with the power supply, and the second output end is electrically connected with the Bluetooth headset to be charged.

[0080] One end of the second thermal sensitive load module 350 is electrically connected with the second temperature monitoring end 313 and the first pole of the second switch module 320, the other end of the second thermal sensitive load module 350 is grounded, one end of the second main load module 340 and the second auxiliary load module 330 is electrically connected with the second current adjusting end 314, the second auxiliary load module 330 is electrically connected with the second pole of the second switch module 320, the other end of the second main load module 340 and the third pole of the second switch module 320 are grounded.

[0081] If the second thermal sensitive load module 350 detects that the current second temperature from the second temperature monitoring end 313 is less than the second temperature threshold value, the second switch module 320 is cut off, the second main load module 340 is connected to the second current adjusting end 314, and the second current adjusting end 314 is connected to the third total resistance value;

[0082] If the second thermal sensitive load module 350 detects that the current second temperature from the second temperature monitoring end 313 is greater than the second temperature threshold value, the second switch module 320 is turned on, the second main load module 340 and the second auxiliary load module 330 are connected to the second current adjusting end 314, and the second current adjusting end 314 is connected to the fourth total resistance value;

[0083] The third total resistance value is greater than the fourth total resistance value.

[0084] According to some embodiments of the present application, the working current output by the second output end of the second control module decreases with the decrease of the total resistance value to which the current adjusting end is connected (the second charging scheme). In this case:

[0085] The second input end of the second control module is used to receive power supply from the power supply, and the second output end is used to be electrically connected with the Bluetooth earphone to be charged, that is, the functional characteristics of the second control module are similar to those of the control module, which will not be repeated here. In addition, the functions of the various ends of the second control module are similar to those of the control module, the functional characteristics of the second thermal sensitive load module 350 are similar to those of the thermal sensitive load module, the functional characteristics of the second switch module 320 are similar to those of the switch module, the functional characteristics of the second main load module 340 are similar to those of the main load module, and the functional characteristics of the second auxiliary load module 330 are similar to those of the auxiliary load module. Therefore, the functional characteristics of each functional module will not be repeated here. The specific embodiments of the second charging scheme will be described in detail as follows:

[0086] According to some embodiments of the present application, a second static load module is further included, the first end of the second static load module is electrically connected with the second temperature monitoring end 313, the second end of the second static load module is electrically connected with the first pole of the second switch module 320, and the third end of the second static load module is grounded.

[0087] As Figure 3As shown, the second static load module acts as a constant electrical path, ensuring that even if the resistance of the second temperature-sensitive load module 350 changes due to temperature changes, Figure 3 The total circuit shown can still maintain certain stability and reliability.

[0088] Specifically, when the charging ambient temperature rises, the resistance of the second temperature-sensitive load module 350 will decrease (for example, NTC), and the voltage U between the second temperature-sensitive load module 350 and the gate of the second switch module 320 will decrease accordingly. G2 to change the on-off state of the second switch module 320. At the same time, due to the decrease in the resistance of the second temperature-sensitive load module 350, the instantaneous current in the electrical path where the second temperature-sensitive load module 350 is located will increase accordingly. The addition of the second static load module can prevent the instantaneous current flowing through the second switch module 320 from suddenly increasing, thereby protecting the second switch module 320 and related other components from potential damage and improving charging stability.

[0089] It can be understood that in some embodiments, the design of the second static load module can be more complex to adapt to different application scenarios. For example, the second static load module can choose a resistor with a specific temperature coefficient, which can provide relatively stable load characteristics at different temperatures, further optimizing temperature sensing and current regulation performance. In addition, it can also be considered to design the second static load module as an adjustable load, that is, to allow users to adjust its resistance according to actual use to achieve the best charging effect.

[0090] In addition, in order to improve the overall efficiency and response speed of the system, a fast fuse or other form of overcurrent protection device can be integrated into the second static load module. Once an abnormally high current is detected, these protection devices can immediately cut off the power supply to avoid possible short circuit or fire accidents. Alternatively, a voltage detection circuit can also be added to monitor the voltage difference across the second static load module in real time and trigger an alarm or take other safety measures when necessary to ensure the safety and controllability of the charging process.

[0091] According to some embodiments of the present application, the second static load module includes a third load element and a fourth load element connected in parallel, one end of the third load element and the fourth load element is electrically connected to the first pole of the second switch module 320, the other end of the third load element is electrically connected to the second temperature monitoring terminal 313, and the other end of the fourth load element is grounded.

[0092] As Figure 3As shown, the third load element is resistor R20 and the fourth load element is resistor R21. In this embodiment, the third and fourth load elements are connected in parallel. Of course, the third and fourth load elements can also be connected in series. In addition to including the third and fourth load elements, the second static load module can also include only one load element or two or more load elements. The connection method between the load elements to form the second static load module can be set according to the actual situation, and this embodiment does not limit it.

[0093] like Figure 3 As shown, according to some embodiments of this application, the second switching module 320 is a P-channel MOSFET (also known as a "PMOS transistor"). The gate (G) of the P-channel MOSFET is electrically connected to one end of the second thermistor load module 350, the source (S) of the P-channel MOSFET is electrically connected to one end of the second auxiliary load module 330, and the drain (D) of the P-channel MOSFET is grounded.

[0094] Among them, the PMOS transistor is a semiconductor device that uses the electric field effect to control current. When the gate of the PMOS transistor receives a low-level signal (i.e., U), G2 When the voltage exceeds the second threshold voltage, the PMOS transistor is turned on, allowing current to flow from the source to the drain. In the second charging scheme, a low threshold voltage is selected for the PMOS transistor, with a negative bias voltage of less than -1.2V when turned on. The second thermistor load module 350 uses an NTC resistor, with a resistance of approximately 100KΩ at 25℃ and approximately 70KΩ at 33℃. The resistance of the third load element is set to approximately 24KΩ, and the resistance of the fourth load element is set to approximately 120KΩ. Under these settings, the voltage difference of the second switch module 320 at normal temperature (25℃) is approximately -1.02V, which does not meet the turn-on condition of the second switch module 320. At this time, the second switch module 320 is turned on, and the second current adjustment terminal 314 is connected to the third total resistance value. The third total resistance value is related to the resistance values ​​of the second thermistor load module 350, the second static load module, the second switch module 320 (which is almost negligible), and the second main load module 340.

[0095] Under this setting, the differential pressure of the second switch module 320 at the abnormal temperature (33°C) is about -1.22V (less than -1.2V), which meets the conduction condition of the second switch module 320. At this time, the second switch module 320 is turned on, the second current adjustment end 314 is connected to the fourth total resistance, the fourth total resistance is related to the resistance of the second thermosensitive load module 350, the second static load module, the second switch module 320 (which can be ignored), the second main load module 340 and the second auxiliary load module 330, and the second main load module 340 and the second auxiliary load module 330 are connected in parallel to the current adjustment end. Since the total resistance of the two load modules in parallel is less than the total resistance of a single load module, that is, the third total resistance is greater than the fourth total resistance, the fourth total resistance connected by the second current adjustment end 314 decreases at the abnormal temperature compared with the normal temperature, and then the working current output by the second output end decreases. In practical application, when the second control module with the second charging implementation scheme is used, the first charging current output by the second output end to the charging device is 400mA at the normal temperature, and the second charging current output by the second output end to the charging device is 200mA at the abnormal temperature, and the first charging current > the second charging current. It can be seen that the charging of the charging device is carried out by a large current at the normal temperature, and the charging of the charging device is carried out by a small current at the abnormal temperature, which ensures the charging efficiency of the charging device.

[0096] Further, it needs to be explained that the PMOS tube is selected as the second switch module 320 in the embodiment of the application because the resistance between the drain and the source of the PMOS tube is very low in the conduction state, which can reach several to dozens of milliohms, which means that the conduction loss of the PMOS tube is very small in the application of large current, and then the overall efficiency of the circuit can be significantly improved. Moreover, since the conduction resistance is low, the heat generated by the PMOS tube when it is turned on is small, which reduces the heat dissipation demand, simplifies the thermal management design, and reduces the cost.

[0097] Further, the second switch module 320 can also be other types of components, for example, the second switch module 320 can also be, for example, a PNP type triode. The specific component type of the second switch module 320 is not limited in the embodiment of the application, and can be adaptively adjusted according to the actual situation.

[0098] It can be understood that in some embodiments, in order to improve the temperature detection accuracy and reliability, an additional filtering circuit or compensation circuit can also be added to the second temperature monitoring end to eliminate the influence of noise interference and temperature drift. For example, a low-pass filter can be added to smooth the temperature signal, or a temperature compensation circuit can be used to correct the nonlinear characteristics of the thermosensitive load module at different temperatures, so that the entire system is more stable and reliable.

[0099] It can be understood that, in some embodiments, the performance of the second switch module is enhanced by introducing an external drive circuit. For example, a gate driver can be added in the second switch module to provide sufficient drive current and faster switching speed, especially in high-frequency applications, which can effectively reduce the loss of the second switch module and improve the overall conversion efficiency. At the same time, fault detection and diagnosis functions such as short circuit protection and overcurrent protection can also be integrated, making the charging management circuit of the embodiments of the present application more reliable.

[0100] The embodiments of the present application also provide an earphone charging box. The earphone charging box comprises a charging bin, and the charging bin comprises a first conductive contact. When a Bluetooth earphone to be charged is placed in the charging bin and a second conductive contact of the Bluetooth earphone is electrically connected with the first conductive contact, the earphone charging box charges the Bluetooth earphone.

[0101] Among them, the conductive contact is a key component for realizing the transmission of electric energy between the Bluetooth earphone and the earphone charging box. These contacts are usually located at the bottom or side of the Bluetooth earphone and the corresponding position of the earphone charging box, to ensure that when the Bluetooth earphone is placed in the charging box, the earphone charging box can charge the Bluetooth earphone through physical contact.

[0102] The charging management circuit provided by the embodiments of the present application can be arranged in the earphone charging box. The earphone charging box is a portable charging device specially designed for true wireless earphones (i.e. Bluetooth earphones), which not only provides a safe storage space for the earphones, but also charges the earphones when the power is depleted.

[0103] The charging device mentioned in the embodiments of the present application can be a Bluetooth earphone. When the Bluetooth earphone is placed in the charging bin of the earphone charging box and the second conductive contact of the Bluetooth earphone is electrically connected with the first conductive contact in the charging bin of the earphone charging box, the earphone charging box based on the charging management circuit provided by the embodiments of the present application can quickly (with large current) charge the Bluetooth earphone when the charging temperature is normal, and continuously charge the Bluetooth earphone with small current when the charging temperature is high, thereby improving the charging efficiency of the earphone charging box for the Bluetooth earphone. Moreover, since the embodiments of the present application only involve improvements in the hardware aspect, the research and development cost is reduced, and the embodiments of the present application have very high practical application value.

[0104] It should also be understood that the various embodiments provided by the embodiments of the present application can be combined in any way to achieve different technical effects.

[0105] The above is a specific description of the preferred embodiments of the present application, but the present application is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application, and these equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. A charge management circuit, characterized by, The utility model relates to a charging device for bluetooth earphone, including: a control module, an input end, an output end, a temperature monitoring end and a current adjustment end, the input end is used for being electrically connected with power supply, the output end is used for being electrically connected with the bluetooth earphone to be charged; a switch module, an auxiliary load module, a main load module and a thermal load module, one end of the thermal load module is electrically connected with the temperature monitoring end and the first pole of the switch module, one end of the main load module and the auxiliary load module is electrically connected with the current adjustment end, the other end of the auxiliary load module is electrically connected with the second pole of the switch module.

2. The charge management circuit of claim 1, wherein, The control module is a first control module, the switch module is a first switch module, the auxiliary load module is a first auxiliary load module, the main load module is a first main load module, and the thermal load module is a first thermal load module. The first control module includes a first input end, a first output end, a first temperature monitoring end and a first current adjustment end, the first input end is used for being electrically connected with power supply, the first output end is used for being electrically connected with the bluetooth earphone to be charged; One end of the first thermal load module is electrically connected with the first temperature monitoring end and the first pole of the first switch module, the other end of the first thermal load module is grounded, one end of the first main load module and the first auxiliary load module is electrically connected with the first current adjustment end, the first auxiliary load module is electrically connected with the second pole of the first switch module, the other end of the first main load module and the third pole of the first switch module are grounded.

3. The charge management circuit of claim 2, wherein, If the first thermal load module detects that the current first temperature from the first temperature monitoring end is less than a first temperature threshold, the first switch module is turned on, the first main load module and the first auxiliary load module are connected to the first current adjustment end, and the first current adjustment end is connected to a first total resistance value. If the first thermal load module detects that the current first temperature from the first temperature monitoring end is greater than a first temperature threshold, the first switch module is turned off, the first main load module is connected to the first current adjustment end, and the first current adjustment end is connected to a second total resistance value. Wherein, the first total resistance value is less than the second total resistance value.

4. The charge management circuit of claim 2, wherein, It also includes a first load element and a second load element in parallel, one end of the first load element and the second load element is electrically connected with the first pole of the first switch module, the other end of the first load element is electrically connected with the first temperature monitoring end, and the other end of the second load element is grounded.

5. The charge management circuit of claim 2, wherein, The first switch module is an N-channel field effect tube, one end of the N-channel field effect tube is electrically connected with the first thermal load module, the other end of the N-channel field effect tube is electrically connected with the first auxiliary load module, and the source electrode is grounded.

6. The charge management circuit of claim 1, wherein, The control module is a second control module, the switch module is a second switch module, the auxiliary load module is a second auxiliary load module, the main load module is a second main load module, and the thermal load module is a second thermal load module. The second control module comprises a second input end, a second output end, a second temperature monitoring end and a second current adjusting end, the second input end is used for electrically connecting with a power supply, and the second output end is used for electrically connecting with a Bluetooth earphone to be charged; One end of the second heat-sensitive load module is electrically connected with the second temperature monitoring end and the first pole of the second switch module, the other end of the second heat-sensitive load module is grounded, one end of the second main load module and the second auxiliary load module is electrically connected with the second current adjusting end, the second auxiliary load module is electrically connected with the second pole of the second switch module, and the other end of the second main load module and the third pole of the second switch module are grounded.

7. The charge management circuit of claim 6, wherein, If the second heat-sensitive load module detects that the current second temperature from the second temperature monitoring end is less than a second temperature threshold, the second switch module is cut off, the second main load module is connected to the second current adjusting end, and the second current adjusting end is connected to a third total resistance value; If the second heat-sensitive load module detects that the current second temperature from the second temperature monitoring end is greater than a second temperature threshold, the second switch module is turned on, the second main load module and the second auxiliary load module are connected to the second current adjusting end, and the second current adjusting end is connected to a fourth total resistance value; The third total resistance value is greater than the fourth total resistance value.

8. The charge management circuit of claim 6, wherein, The third load element and the fourth load element are in parallel, one end of the third load element and the fourth load element is electrically connected with the first pole of the second switch module, the other end of the third load element is electrically connected with the second temperature monitoring end, and the other end of the fourth load element is grounded.

9. The charge management circuit of claim 6, wherein, The second switch module is a P-channel field effect tube, one end of the P-channel field effect tube is electrically connected with one end of the second heat-sensitive load module, the source of the P-channel field effect tube is electrically connected with one end of the second auxiliary load module, and the drain of the P-channel field effect tube is grounded.

10. An earphone charging case, characterized in that, The earphone charging box comprises a charging bin, and the charging bin comprises a first conductive contact point, when the Bluetooth earphone to be charged is placed in the charging bin and the second conductive contact point of the Bluetooth earphone is electrically connected with the first conductive contact point, the earphone charging box charges the Bluetooth earphone.

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