CN213817320U

CN213817320U - Charging circuit suitable for watch and earphone

Info

Publication number: CN213817320U
Application number: CN202023201699.8U
Authority: CN
Inventors: 孙金明
Original assignee: Shenzhen Hengtaiying Technology Co ltd
Current assignee: Shenzhen Hengtaiying Technology Co ltd
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2021-07-27
Anticipated expiration: 2030-12-25

Abstract

The utility model relates to a charging circuit suitable for wrist-watch and earphone. The charging circuit comprises a radio receiving module, a control module, a power supply input module, a charging output module and a power supply switching module, wherein the radio receiving module adopts a receiving coil L1; the control module receives a main chip by adopting wireless charging; one end of the power supply input module is connected with an external power supply, and the other end of the power supply input module is connected with the detection end of the wireless charging receiving main chip; the charging output module comprises two USB charging output interfaces, and the two USB charging output interfaces are connected with the output end of the wireless charging receiving main chip; one end of the power supply switching module is connected with the other end of the power supply input module, the other end of the power supply switching module is respectively connected with the two USB charging output interfaces, and the control end of the power supply switching module is connected with the control end of the wireless charging receiving main chip. The charging circuit provided by the application has the characteristics of small occupied space and wider application scene.

Description

Charging circuit suitable for watch and earphone

Technical Field

The utility model relates to a wireless charging technology field especially relates to a charging circuit suitable for wrist-watch and earphone.

Background

Generally, when a watch or a headset charged by a wire is charged, an AC/DC charger and a USB charging wire are needed, and the watch or the headset is charged by connecting the AC/DC charger and the USB charging wire. However, this charging method has the problems of large size of the charger and many charging wires, and is not suitable for use outdoors.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a charging circuit that is applicable to wrist-watch and earphone that occupation space is littleer, the application scene is more extensive.

For realizing the purpose of the utility model, the utility model adopts the following technical scheme:

a charging circuit suitable for watches and earphones comprises a radio receiving module, a control module, a power supply input module, a charging output module and a power supply switching module, wherein,

the radio receiving module adopts a receiving coil L1; the control module adopts a wireless charging receiving main chip, and the input end of the wireless charging receiving main chip is connected with the receiving coil L1; one end of the power supply input module is connected with an external power supply, and the other end of the power supply input module is connected with the detection end of the wireless charging receiving main chip; the charging output module comprises two USB charging output interfaces, and the two USB charging output interfaces are connected with the output end of the wireless charging receiving main chip; one end of the power supply switching module is connected with the other end of the power supply input module, the other end of the power supply switching module is respectively connected with the two USB charging output interfaces, and the control end of the power supply switching module is connected with the control end of the wireless charging receiving main chip.

Compared with the traditional charging circuit, the charging circuit suitable for the watch and the earphone uses few components, can effectively simplify the circuit and save the PCB space, and can be used for a small-volume shell wireless conversion device; and meanwhile, the watch and the earphone are charged in a wireless charging mode or a wired charging mode, so that the watch and the earphone are more flexible and wider in application scene.

In one embodiment, the power supply switching module includes a MOS transistor Q1, a MOS transistor Q2, and a resistor R1, the control end of the wireless charging receiving main chip is connected to the gate of the MOS transistor Q1 and the gate of the MOS transistor Q2 through the resistor R1, the drain of the MOS transistor Q1 is connected to the other end of the power supply input module, the source of the MOS transistor Q1 is connected to the source of the MOS transistor Q2, and the drain of the MOS transistor Q2 is connected to the two USB charging output interfaces.

In one embodiment, the wireless charging receiving master chip adopts a GPMQ8102 master control chip.

In one embodiment, the power input module includes a MICRO USB power input interface and/or a TYPE-C power input interface.

In one embodiment, the wireless charging receiving system further comprises a blocking module, the blocking module comprises capacitors C1-C4, a first input end of the wireless charging receiving main chip is connected with one end of a capacitor C4 and one end of the receiving coil L1, the other end of the capacitor C4 is connected with one end of a capacitor C3 and one end of a capacitor C2, the other end of the capacitor C3 is connected with the other end of the capacitor C2, and a second input end of the wireless charging receiving main chip is connected with the other end of the capacitor C2 and the other end of the receiving coil L1 through a capacitor C1.

Drawings

FIG. 1 is a schematic diagram of the connection of modules within a charging circuit suitable for use with a watch and a headset in one embodiment;

fig. 2 is a schematic circuit diagram of the charging circuit of fig. 1 suitable for use in a watch and a headset.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

Referring to fig. 1 and 2, the present embodiment provides a charging circuit suitable for a watch and an earphone, including a radio receiving module 100, a control module 200, a power supply input module 300, a charging output module 400, and a power supply switching module 500, where the radio receiving module 100 employs a receiving coil L1; the control module 200 adopts a wireless charging receiving main chip, and the input end of the wireless charging receiving main chip is connected with the receiving coil L1; one end of the power supply input module 300 is connected with an external +5V power supply, and the other end of the power supply input module 300 is connected with the detection end of the wireless charging receiving main chip; the charging output module 400 comprises two USB charging output interfaces, wherein the two USB charging output interfaces are both connected with the output end of the wireless charging receiving main chip and are used for charging the watch and the earphone; one end of the power supply switching module 500 is connected to the other end of the power supply input module 300, the other end of the power supply switching module 500 is connected to the two USB charging output interfaces, and the control end of the power supply switching module 500 is connected to the control end of the wireless charging receiving main chip.

In an embodiment, the power supply switching module 500 may include a MOS transistor Q1, a MOS transistor Q2, and a resistor R1, the control terminal (NADEN terminal) of the wireless charging receiving main chip is connected to the gate of the MOS transistor Q1 and the gate of the MOS transistor Q2 through the resistor R1, the drain of the MOS transistor Q1 is connected to the other end of the power supply input module 300, the source of the MOS transistor Q1 is connected to the source of the MOS transistor Q2, and the drain of the MOS transistor Q2 is connected to the two USB charging output interfaces, respectively.

Specifically, the wireless charging receiving main chip can adopt a GPMQ8102 main control chip; the power input module 300 may include a MICRO USB power input interface and/or a TYPE-C power input interface.

Further, the charging circuit suitable for the watch and the earphone provided by this embodiment may further include a blocking module, where the blocking module includes capacitors C1 to C4, a first input terminal (AC1 terminal) of the wireless charging receiving main chip is respectively connected to one end of the capacitor C4 and one end of the receiving coil L1, another end of the capacitor C4 is respectively connected to one end of the capacitor C3 and one end of the capacitor C2, another end of the capacitor C3 is connected to another end of the capacitor C2, and a second input terminal (AC2 terminal) of the wireless charging receiving main chip is respectively connected to another end of the capacitor C2 and another end of the receiving coil L1 through a capacitor C1.

The charging circuit suitable for the watch and the earphone has 2 charging modes, namely, when the main control chip detects that the wireless charger is arranged through the receiving coil L1 and does not detect that the external 5V power supply supplies power, the main control chip starts to perform protocol identification with the wireless charger, and after the protocol identification is completed, the receiving coil L1 starts to receive power and discharge two USB charging output interfaces; and in a second charging mode, when the main control chip detects that the external 5V power supply supplies power, the main control chip closes the detection power of the receiving coil L1, and the external 5V power supply is used for discharging the two USB charging output interfaces.

Specifically, the working principle of the charging circuit suitable for the watch and the earphone provided by this embodiment is as follows: the first charging method of the invention: the receiving coil L1 is connected with the AC1 end and the AC2 end of the GPMQ8102 main control chip through the blocking capacitors C1-C4 and is used as a protocol detection, power detection and main power input loop, and when the receiving coil L1 detects that the wireless charger exists, the identification and handshake signals of the wireless charger can be received between the AC1 end and the AC2 end of the main control chip; at the moment, the main control chip firstly identifies whether an external 5V power supply voltage is input or not by detecting the voltage through a detection end (AD end), when the voltage detected by the AD end is higher than 4V, the external input voltage is judged, the main control chip stops communicating with an external wireless charger, and the charging mode is changed to a second charging mode; when the voltage detected by the AD end of the wireless charger is lower than 4V, the fact that no external input voltage exists is judged, the main control chip starts to carry out protocol detection and power detection with the wireless charger, and if the voltage is not abnormal, power transmission is started. Charging power is input from the AC1 end and the AC2 end of the main control chip, and then is output from the output end (OUT end) of the main control chip after being rectified by the rectifying circuit in the main control chip, so as to supply power for the two USB charging output interfaces. Further, the charging circuit provided by this embodiment may further include a filter shaping circuit, such as a capacitor C5, a capacitor C8, a capacitor C10, capacitors C13 to C15, and capacitors C16 to C18 shown in the figure.

And a second charging mode: when an external MICROUSB or TYPE-C input port is connected with a 5V power supply, the master control chip detects that the voltage of an AD end is higher than 4V, and all functions of wireless charging input are forbidden; then the control end (NADEN end) of the main control chip outputs a low level signal to enable the MOS tubes Q1 and Q2 to be conducted; and connecting an external input 5V power supply to an output end (OUT end) of the main control chip to supply power for the two USB charging output interfaces. The GPMQ8102 main control chip can also detect the output voltage and current from time to time and is used as a main protection function terminal.

Compared with the traditional charging circuit, the charging circuit suitable for the watch and the earphone provided by the embodiment has few components, can effectively simplify the circuit and save the PCB space, and can be used for a small-volume shell wireless conversion device; and meanwhile, the watch and the earphone are charged in a wireless charging mode or a wired charging mode, so that the watch and the earphone are more flexible and wider in application scene.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A charging circuit suitable for watches and earphones comprises a radio receiving module, a control module, a power supply input module, a charging output module and a power supply switching module, wherein,

2. The charging circuit applicable to watches and earphones as claimed in claim 1, wherein the power supply switching module comprises a MOS transistor Q1, a MOS transistor Q2 and a resistor R1, the control terminal of the wireless charging receiving main chip is connected to the gate of the MOS transistor Q1 and the gate of the MOS transistor Q2 through the resistor R1, the drain of the MOS transistor Q1 is connected to the other end of the power supply input module, the source of the MOS transistor Q1 is connected to the source of the MOS transistor Q2, and the drain of the MOS transistor Q2 is connected to the two USB charging output interfaces.

3. The charging circuit suitable for watches and earphones according to claim 1 or 2, wherein the wireless charging receiving master chip employs a GPMQ8102 master control chip.

4. A charging circuit suitable for watches and earphones according to claim 1 or 2, wherein the power input module comprises a MICRO USB power input interface and/or a TYPE-C power input interface.

5. The charging circuit suitable for the watch and the earphone according to claim 1 or 2, further comprising a blocking module, wherein the blocking module comprises capacitors C1-C4, a first input terminal of the wireless charging receiving main chip is respectively connected with one terminal of a capacitor C4 and one terminal of the receiving coil L1, the other terminal of the capacitor C4 is respectively connected with one terminal of a capacitor C3 and one terminal of a capacitor C2, the other terminal of the capacitor C3 is connected with the other terminal of the capacitor C2, and a second input terminal of the wireless charging receiving main chip is respectively connected with the other terminal of the capacitor C2 and the other terminal of the receiving coil L1 through a capacitor C1.