Charging case circuit, wireless earphones, and wireless earphone system

Abstract

The application provides a charging box circuit, a wireless earphone and a wireless earphone system. The charging box circuit comprises a charging box battery, a control unit having a first communication mode and a power supply mode, and a DC-DC converter comprising an output capacitor with a variable connection relationship. When the control unit is in the first communication mode, the control unit changes the connection relationship of the output capacitor, so that the output capacitor is disconnected from the power output end and / or the ground end. The control unit directly outputs one of a first level and a second level for representing binary data to be transmitted through the power output end, wherein the first level is higher than the second level, and the first level is lower than the power supply voltage output by the power output end. In this way, the high-speed communication mode with the wireless earphone can be supported.

Description

[0001] The present application relates to the field of true wireless earphones, in particular to a charging case circuit, a wireless earphone and a wireless earphone system.

[0002] A common way for a charging case to transmit information to a true wireless (TWS) earphone is that a controller in the charging case controls a boost circuit to start or stop, so that a connection node voltage VCHG switches between 5V and 0V. Specifically, when the boost circuit starts, 5V is output to the VCHG node; when the boost circuit is stopped, the VCHG node becomes 0V. The true wireless earphone obtains simple communication information by detecting this signal, and the simple communication information is generally the opening and closing cover information of the charging case.

[0003] With the continuous development of product functions, in order to realize more complex system functions, the charging case needs to transmit more information to the true wireless earphone, such as upgrading software in the TWS earphone. Therefore, it is necessary to improve the existing scheme.

[0004] One of the purposes of the present application is to provide a charging case circuit that can support a high-speed communication mode with a wireless earphone.

[0005] The second purpose of the present application is to provide a wireless earphone that can support a high-speed communication mode with a charging case circuit.

[0006] The third purpose of the present application is to provide a wireless earphone system that can support a high-speed communication mode between a wireless earphone and a charging case circuit.

[0007] According to one aspect of the present application, the present application provides a charging case circuit, comprising: a charging case battery; a control unit having a first communication mode and a power supply mode; a DC-DC converter comprising an output capacitor with a variable connection relationship, when the control unit is in the power supply mode, the control unit changes the connection relationship of the output capacitor, so that the output capacitor is connected in series between the power supply output end and the ground end, the control unit controls the DC-DC converter to convert the voltage of the charging case battery into a power supply voltage and output through the power supply output end, when the control unit is in the first communication mode, the control unit changes the connection relationship of the output capacitor, so that the output capacitor is disconnected from the power supply output end and / or the ground end, and the control unit outputs a first level and a second level through the power supply output end for representing binary data to be transmitted, wherein the first level is higher than the second level, and the first level is lower than the power supply voltage output by the power supply output end.

[0008] ​​​According to another aspect of the present application, the present application provides a wireless earphone, comprising: an earphone battery; a communication unit connected to a power input terminal; an application processor; a bypass power supply circuit connected to the power input terminal, capable of providing backup power for the communication unit and the application processor based on the voltage input by the power input terminal, the power input terminal being electrically connectable with a power output terminal of a charging box circuit, wherein the communication unit identifies a first level or a second level input by the power input terminal in a first communication mode, and recovers the transmitted data based on the identified first level or second level, wherein the first level is greater than the second level.

[0009] According to another aspect of the present application, the present application provides a wireless earphone system, comprising: a charging box comprising a box body and a charging box circuit arranged in the box body, the box body being provided with an earphone compartment; a wireless earphone capable of being placed in the earphone compartment, when the wireless earphone is placed in the earphone compartment, a power output terminal of the charging box circuit is electrically coupled with a power input terminal of the earphone, and a ground output terminal of the charging box circuit is electrically coupled with a ground input terminal of the earphone. The charging box circuit comprises: a charging box battery; a control unit having a first communication mode and a power supply mode; a DC-DC converter comprising an output capacitor with variable connection relationship, when the control unit is in the power supply mode, the control unit changes the connection relationship of the output capacitor, so that the output capacitor is connected in series between the power output terminal and the ground terminal, the control unit controls the DC-DC converter to convert the voltage of the charging box battery into a supply voltage and output through the power output terminal, when the control unit is in the first communication mode, the control unit changes the connection relationship of the output capacitor, so that the output capacitor is disconnected from the power output terminal and / or the ground terminal, and the control unit directly outputs a first level and a second level through the power output terminal for representing the binary data to be transmitted, wherein the first level is higher than the second level, and the first level is lower than the supply voltage output by the power output terminal. The wireless earphone comprises: an earphone battery; a communication unit connected to a power input terminal; an application processor; a bypass power supply circuit connected to the power input terminal, capable of providing backup power for the communication unit and the application processor based on the voltage input by the power input terminal, the power input terminal being electrically connectable with a power output terminal of a charging box circuit, wherein the communication unit identifies a first level or a second level input by the power input terminal in a first communication mode, and recovers the transmitted data based on the identified first level or second level, wherein the first level is greater than the second level.

[0010] Compared with the prior art, the charging box circuit in the present application can supply power or charge the wireless earphone, and also support high-speed communication with the wireless earphone.

[0011] The specific and more beneficial effects of the present application will be described in detail below in conjunction with specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor. Among them:

[0013] Figure 1 The circuit diagram of the wireless earphone system in an embodiment of the present application;

[0014] Figure 2 The circuit diagram of the wireless earphone system in another embodiment of the present application. DETAILED DESCRIPTION

[0015] In order to make the technical solutions and advantages of the embodiments of the present application more clear and obvious, the exemplary embodiments of the present application will be further described in detail below in conjunction with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments of the present application. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0016] Figure 1 The circuit diagram of the wireless earphone system in an embodiment of the present application. As shown in Figure 1 The wireless earphone system includes a charging box and a wireless earphone 200. The charging box includes a box body and a charging box circuit 100 arranged in the box body. The box body includes a box cover, and the box body is provided with an earphone compartment. After the box cover is opened, the wireless earphone 200 can be placed in or taken out of the earphone compartment. The wireless earphone is a true wireless (TWS) earphone, which can communicate with a smart terminal through Bluetooth to answer a phone or listen to music.

[0017] As Figure 1As shown, the charging box circuit 100 includes a charging box battery BAT3, a control unit 110, a DC-DC converter 120, and a charging box charger 130. The charging box charger 130 charges the charging box battery BAT3 through an external power supply. Preferably, the charging box circuit 100 also includes an analog-to-digital converter (ADC3) 140 and a cover detection unit 150. The analog-to-digital converter 140 can detect the voltage of the charging box battery BAT3 and provide the voltage of the charging box battery BAT3 to the control unit 110 after analog-to-digital conversion. The cover detection unit 150 can detect the open or closed state of the charging box cover and provide the open or closed state of the charging box cover to the control unit 110. For example, the cover detection unit 150 can be a Hall sensor. In addition, the charging box circuit 100 can also include a temperature detection unit of the charging box battery BAT3, which can detect the temperature of the charging box battery BAT3 and provide the obtained temperature information to the control unit 110.

[0018] The control unit 110 has a first communication mode, a second communication mode, and a power supply mode, wherein the first communication mode can also be referred to as a high-speed communication mode, and the second communication mode can also be referred to as a low-speed communication mode. When the control unit 110 is in the power supply mode, the DC-DC (i.e., DC to DC) converter 120 can convert the voltage of the charging box battery BAT3 into a power supply voltage and output it through the power output terminal OUT1.

[0019] like Figure 1 As shown, the wireless headset 200 includes a headset battery BAT1, an application processor (AP1) 210, a bypass power supply circuit 220 coupled to the power input terminal, a communication unit 230 coupled to the power input terminal VCHG1, and a headset charger 250 coupled to the power input terminal.

[0020] After the wireless headset 200 is placed in the charging compartment of the charging box, the power input terminal VCHG1 of the wireless headset 200 is electrically coupled to the power output terminal OUT1 of the charging box circuit 100, and the ground input terminal GND of the wireless headset 200 is electrically coupled to the ground output terminal of the charging box circuit 100. At this time, the control unit 110 enters the power supply mode, the DC-DC (i.e., DC to DC) converter 120 can convert the voltage of the charging box battery BAT3 into a supply voltage, and the headset charger 250 can charge the headset battery BAT1 based on the supply voltage of the power input terminal. No data communication is performed in the power supply mode.

[0021] In addition, the bypass power supply circuit 220 provides backup power to various circuit modules of the wireless headset 200, such as the application processor 210 and the bypass power supply circuit 220, based on the supply voltage of the power input terminal VCHG1. In this way, even if the energy supply capacity of the battery BAT1 of the wireless headset is insufficient, after the wireless headset is placed in the charging compartment, the power output terminal OUT1 can also directly provide power to the various circuit modules of the wireless headset 200 through the bypass power supply circuit 220, so that the wireless headset can start up quickly and normally without having to wait until the headset battery BAT1 is charged to a certain level before starting up normally. At this time, the wireless headset 200 can complete data communication with the charging box circuit 100 through the communication unit 230 via the power output terminal OUT1.

[0022] like Figure 1 As shown, the DC-DC converter 120 includes an output capacitor C1 with a variable connection relationship and a DC-DC conversion unit. The DC-DC conversion unit can be implemented using existing methods according to the requirements of the present invention, but is not the focus of the present invention and will not be described in detail herein. The control unit can change the connection relationship of the output capacitor C1 so that the output capacitor C1 is disconnected from the power output terminal and / or the ground terminal. The control unit can also change the connection relationship of the output capacitor so that the output capacitor C1 is connected in series between the power output terminal OUT1 and the ground terminal. In one embodiment, the output capacitor C1 and a controlled switch K1 are connected in series between the power output terminal OUT1 and the ground terminal. When the output capacitor C1 needs to be connected in series between the power output terminal OUT1 and the ground terminal, the control unit 110 controls the controlled switch K1 to be conductive. When the output capacitor needs to be disconnected from the power output terminal and / or the ground terminal, the control unit 110 controls the controlled switch K1 to be disconnected. In another embodiment, the positions of the output capacitor C1 and the controlled switch K1 can be interchanged. The output capacitor C1 can be greater than or equal to 1 microfarad. The output capacitor C1 can stabilize the voltage of the power output terminal OUT1. When the control unit 110 is in the power supply mode, the controlled switch K1 is turned on, which is conducive to stabilizing the power supply voltage output by the DC-DC converter 120.

[0023] In the second communication mode, the communication unit 230 in the wireless earphone 200 can identify the third level or the fourth level input by the power input terminal VCHG1, and recover the transmitted data based on the identification of the third level or the fourth level, so as to realize the low-speed communication between the charging case circuit 100 and the wireless earphone 200. Specifically, the communication unit 230 includes a comparator, which compares the voltage input by the power input terminal VCHG1 with a second predetermined threshold value in the second communication mode to determine whether the input voltage is the third level or the fourth level. In the second communication mode, the binary data to be transmitted can include one or more of the opening or closing state of the cover of the charging case, the voltage information of the charging case battery, and the temperature information of the charging case battery. At this time, the amount of binary data to be transmitted is small, and the low-speed communication mode can fully meet the communication requirements. Specifically, the third level can be considered as logic "1", and the fourth level can be considered as logic "0", of course, it can also be the opposite, so as to realize the transmission of digital data.

[0024] In addition, the fourth level can be greater than or equal to the working voltage of the wireless earphone 200 or the full voltage of the earphone battery BAT1 of the wireless earphone 200, so that in the communication process between the charging case circuit 100 and the wireless earphone 200 in the second communication mode, the fourth level and the third level output by the DC-DC converter 120 through the power output terminal can normally power the wireless earphone or charge the earphone battery of the wireless earphone. That is, the charging case circuit 100 can still charge or bypass power the wireless earphone 200 during the low-speed communication with the wireless earphone 200, that is, the earphone charger 250 can charge the earphone battery BAT1 based on the voltage of the power input terminal, or the bypass power supply circuit 220 can power each circuit module of the wireless earphone 200 based on the voltage of the power input terminal VCHG1.

[0025] In one example, the third level can be 5V, the fourth level can be 4.5V, and the second predetermined threshold of the comparator of the communication unit 230 can be 4.75V. When the voltage of the power input end is greater than 4.75V, the comparator outputs high level, and when the voltage of the power input end is less than 4.75V, the comparator outputs low level, so as to generate a digital signal to identify various information.

[0026] When the control unit 110 is in the first communication mode, i.e., the high-speed communication mode, the control unit 110 controls the controlled switch K1 to be open, so that the output capacitor C1 is disconnected from the power output end and / or the ground end, thereby effectively reducing the capacitance coupled to the power output end OUT1. Too large capacitance coupled to the power output end OUT1 will reduce the communication speed, because the communication speed is limited by the charging time and discharging time of the capacitor. The larger the capacitance value, the longer the charging time and discharging time.

[0027] The control unit 110 directly outputs a first level and a second level representing the binary data to be transmitted through the power output end OUT1 in the first communication mode, wherein the first level is higher than the second level. Specifically, the second level can be a ground level, and the first level is lower than the fourth level. In the first communication mode, the control unit 110 controls the DC-DC converter 120 to stop working. The communication unit 230 in the wireless earphone 200 can identify the first level or the second level input by the power input end VCHG1 in the first communication mode, and restore the transmitted data based on the identified first level or second level, thereby realizing high-speed communication between the charging case circuit 100 and the wireless earphone 200. Specifically, the comparator of the communication unit 230 compares the voltage input by the power input end VCHG1 with a first predetermined threshold to determine whether the input voltage is the first level or the second level. In the first communication mode, the binary data to be transmitted can include one or more of the opening or closing state of the cover of the charging case, the voltage information of the battery of the charging case, the temperature information of the battery of the charging case, the software program of the wireless earphone, and the software program of the charging case. At this time, the amount of binary data to be transmitted is large, and the low-speed communication mode cannot meet the communication requirements, and the high-speed communication mode needs to be used. Specifically, the first level can be considered as logic "1", and the second level can be considered as logic "0", of course, it can also be the opposite, so as to realize the transmission of digital data.

[0028] In addition, the smaller the signal amplitude during communication, the shorter the charging time and discharging time, and thus the faster the communication speed. Therefore, the voltage difference between the first level and the second level in the present application can be no more than 1.5V, such as 0.5V, 0.8V, 0.9V, so as to increase the speed of communication. In an example, the first level can be 0.5V, and the second level can be 0V. The first predetermined threshold of the comparator of the communication unit 230 can be 0.25V. When the voltage of the power input end is greater than 0.25V, the comparator outputs a high level. When the voltage of the power input end is less than 0.25V, the comparator outputs a low level.

[0029] As shown in Figure 1 The wireless earphone 200 further includes an analog-to-digital converter (ADC1) 250, an audio module 260, and a radio frequency module 270. The analog-to-digital converter 250 is configured to convert the voltage of the earphone battery BAT1 into a digital signal and provide the digital signal to the application processor 210.

[0030] Figure 2 A circuit diagram of the wireless earphone system in another embodiment of the present application. Figure 2 The wireless earphone system in the present application is substantially the same as the wireless earphone system in Figure 1 The wireless earphone system in the present application is substantially the same as the wireless earphone system in Before entering the first communication mode, the charging case circuit 100 can notify the wireless earphone 200 that the first communication mode is about to be entered in the second communication mode. At this time, the application processor 210 controls the controlled switch K2 to be turned off, so as to reduce the capacitance connected in series between the power input end VCHG1 and the ground end, so as to ensure high-speed communication. In the second communication mode and the power supply mode, the application processor 210 controls the controlled switch K2 to be turned on, and the input capacitance C2 connected in series between the power input end VCHG1 and the ground end can help the power supply system of the wireless earphone 200 to stabilize the voltage.

[0031] In the present application, the terms "coupled", "connected", "linked", "in connection with", "in connection with", and the like mean electrical connection, unless otherwise specified. The meaning includes direct connection between two or more circuit objects without any intervening circuit objects, and also includes indirect connection between two or more circuit objects through one or more intervening circuit objects. For example, two circuit objects directly connected to each other are referred to as "coupled / connected" to each other. Similarly, two circuit objects are also referred to as "coupled / connected" to each other if one or more intervening circuit objects are connected therebetween. That is, "coupled", "connected", and the like can be direct electrical connection or indirect electrical connection. The indirect electrical connection means that there are other components, such as resistors, capacitors, etc., in the middle.

[0032] While the preferred embodiments of the application have been described, additional variations and modifications can be made to the embodiments by those skilled in the art once they learn of the basic inventive concepts. Therefore, the appended claims are intended to cover all such additional variations and modifications as fall within the scope of the application.

Claims

1. A charging case circuit, characterized by: It comprises: a charging case battery; a control unit having a first communication mode and a power supply mode, a DC-DC converter comprising an output capacitor with a variable connection relationship, when the control unit is in the power supply mode, the control unit changes the connection relationship of the output capacitor so that the output capacitor is connected in series between the power supply output end and the ground end, and the control unit controls the DC-DC converter to convert the voltage of the charging case battery into a power supply voltage and output through the power supply output end, when the control unit is in the first communication mode, the control unit changes the connection relationship of the output capacitor so that the output capacitor is disconnected from the power supply output end and / or the ground end, and after the control unit directly outputs a first level and a second level through the power supply output end for representing the binary data to be transmitted, the control unit outputs through the power supply output end, wherein the first level is higher than the second level, the first level is lower than the power supply voltage output by the power supply output end, and the second level is a ground level, and in the first communication mode, the control unit controls the DC-DC converter to stop working, the control unit further comprises a second communication mode; when the control unit is in the second communication mode, the control unit controls to change the connection relationship of the output capacitor so that the output capacitor is connected in series between the power supply output end and the ground end, and the control unit controls the DC-DC converter to convert the voltage of the charging case battery into a third level and a fourth level for representing the binary data to be transmitted and then output through the power supply output end, wherein the third level is higher than the fourth level, and the first level is lower than the fourth level, the data transmission rate supported by the first communication mode is higher than the data transmission rate supported by the second communication mode, the output capacitor and a controlled switch are connected in series, one end of the output capacitor is connected to the power supply output end or the ground end, and the controlled switch is coupled to the ground end or the power supply output end, when it is necessary to control the output capacitor to be connected in series between the power supply output end and the ground end, the control unit controls the controlled switch to be turned on, and when it is necessary to control the output capacitor to be disconnected from the power supply output end and / or the ground end, the control unit controls the controlled switch to be turned off.

2. The charging case circuit of claim 1, wherein: the output capacitor is greater than or equal to 1 microfarad, the charging case circuit further comprises a ground output end, the voltage difference between the second level and the first level is less than 1.5V.

3. The charging case circuit of claim 1, wherein: the fourth level is greater than or equal to the operating voltage of the wireless earphone or the full charge voltage of the earphone battery of the wireless earphone, and the third level and the fourth level output through the power supply output end during the communication process between the charging case circuit and the wireless earphone in the second communication mode can normally power the wireless earphone or charge the earphone battery of the wireless earphone.

4. The charging case circuit of claim 1, wherein: in the second communication mode, the binary data to be transmitted includes one or more of the opening or closing state of the cover of the charging case, the voltage information of the charging case battery, and the temperature information of the charging case battery. In the first communication mode, the binary data to be transmitted includes one or more of the open or closed state of the cover of the charging case, voltage information of the battery of the charging case, temperature information of the battery of the charging case, software program of the wireless earphone, and software program of the charging case.

5. A wireless earpiece, characterized in that It comprises: an earphone battery; a communication unit connected to a power input terminal; an application processor; a bypass power supply circuit connected to the power input terminal, capable of providing backup power for the communication unit and the application processor based on the voltage input by the power input terminal, and the power input terminal can be electrically connected to the power output terminal of the charging case circuit; a controlled switch and an input capacitor connected in series between the power input terminal and the ground terminal; wherein the communication unit identifies a first level or a second level input by the power input terminal in the first communication mode, and recovers the transmitted data based on the identified first level or second level, wherein the first level is higher than the second level, and the first level is lower than the supply voltage output by the power output terminal, in the first communication mode, the application processor controls the controlled switch to be turned off, the communication unit identifies a third level or a fourth level input by the power input terminal in the second communication mode, and recovers the transmitted data based on the identified third level or fourth level, wherein the third level is higher than the fourth level, and the fourth level is higher than the first level, and the second level is ground level, the communication unit comprises a comparator, which compares the voltage input by the power input terminal with a first predetermined threshold in the first communication mode to identify the first level or the second level input by the power input terminal, and compares the voltage input by the power input terminal with a second predetermined threshold in the second communication mode to identify the third level or the fourth level input by the power input terminal, in the second communication mode or the power supply mode, the application processor controls the controlled switch to be turned on, the data transmission rate supported by the first communication mode is higher than the data transmission rate supported by the second communication mode, it further comprises: an earphone charger connected to the power input terminal, which charges the earphone battery based on the voltage of the power input terminal, when the voltage input by the power input terminal is the third level or the fourth level, the earphone charger charges the earphone battery based on the third level or the fourth level, and the bypass power supply circuit provides backup power for the communication unit and the application processor based on the third level or the fourth level.

6. The wireless earphone of claim 5, wherein: in the first communication mode, the earphone charger stops charging the earphone battery.

7. The wireless earphone of claim 6, wherein: in the second communication mode, the communication unit identifies the third level or the fourth level input by the power input terminal to recover the transmitted data, after receiving a communication mode switching signal from the charging case circuit, the application processor controls the controlled switch to be turned off, and then the communication unit works in the first communication mode, at this time the communication unit identifies the first level or the second level input by the power input terminal to recover the transmitted data, The wireless earphone further comprises a ground input terminal.

8. A wireless earphone system, characterized by It comprises: A charging box comprising a box body and a charging box circuit as claimed in any one of claims 1-4 arranged in the box body, wherein the box body is provided with an earphone compartment; The wireless earphone as claimed in any one of claims 5-7 can be placed in the earphone compartment, When the wireless earphone is placed in the earphone compartment, the power output terminal of the charging box circuit is electrically coupled with the power input terminal of the earphone, and the ground output terminal of the charging box circuit is electrically coupled with the ground input terminal of the earphone.

Images