Coil device with radio frequency and wireless charging functions and earphone charging box

Abstract

The invention discloses a coil device with radio frequency and wireless charging functions and an earphone charging box, the coil device comprises a coil module, a wireless charging module and a radio frequency module, the coil module comprises a coil and a switcher, the switcher comprises a first connecting end, a second connecting end and a third connecting end, the first connecting end is connected with the coil, the second connecting end is connected with the wireless charging module, and the third connecting end is connected with the wireless charging module. The switcher is used for switching the first connecting end to be communicated with the second connecting end or the third connecting end; the wireless charging module comprises a wireless charging controller, and the wireless charging controller is used for transmitting and receiving handshake signals through the second connecting end and outputting current signals input by the first signal end to the power supply output end; the radio frequency module comprises a radio frequency controller, and the radio frequency controller is used for transmitting and receiving a radio frequency signal through the third connecting end. According to the coil device with the radio frequency and wireless charging functions, the radio frequency performance can be improved while the design of a radio frequency antenna is reduced, and the overall structure of the coil device is optimized.

Description

Technical Field

[0001] The present invention relates to the technical field of coil devices, and in particular to a coil device and an earphone charging box with radio frequency and wireless charging functions. Background Art

[0002] Existing electronic products are equipped with wireless charging modules and radio frequency modules to realize wireless charging and the transmission of Bluetooth radio frequency signals, such as the TWS earphone charging box with a search function. Generally speaking, the wireless charging module and the wireless charging coil and the radio frequency antenna in the radio frequency module are discrete and easy to affect each other. In order to reduce the interference between the two, the two need to be designed in specific positions of the electronic product. Such a setting will also affect the optimization of the internal structure of the electronic product, making it difficult to improve the electronic product. Summary of the invention

[0003] The purpose of the present invention is to provide a coil device and an earphone charging box with radio frequency and wireless charging functions, which can realize that the radio frequency module and the wireless charging module share a coil, reduce the design of the radio frequency antenna, improve the radio frequency performance, and optimize the overall structure of the coil device.

[0004] In order to achieve the above object, the present invention discloses a coil device with radio frequency and wireless charging functions, which comprises:

[0005] A coil module, the coil module comprising a coil and a switch, the switch comprising a first connection end, a second connection end and a third connection end, the first connection end being connected to the coil, and the switch being used to switch the first connection end to be connected to the second connection end or to the third connection end;

[0006] A wireless charging module, the wireless charging module comprising a wireless charging controller, the wireless charging controller being provided with a power supply output terminal and a first signal terminal, the first signal terminal being connected to the second connection terminal, the power supply output terminal being connected to a load, and when the first connection terminal is connected to the second connection terminal, the wireless charging controller is used to transmit and receive a handshake signal through the second connection terminal, and is used to output a current signal input by the first signal terminal to the power supply output terminal;

[0007] The RF module includes a RF controller, the RF controller is provided with a second signal end, the second signal end is connected to the third connection end, when the first connection end is connected to the third connection end, the RF controller is used to transmit and receive RF signals through the third connection end.

[0008] Optionally, the switch includes a switching control end, which is connected to the controller, and the switch is used to switch the first connection end to be connected to the second connection end according to a first signal received by the switching control end, and to switch the first connection end to be connected to the third connection end according to a second signal received by the switching control end.

[0009] Optionally, the first signal is a high level signal, and the second signal is a low level signal.

[0010] Optionally, the RF module further includes a matching circuit, two ends of the matching circuit are respectively connected to the second signal end and the third connection end, and the matching circuit is used to match the impedance between the RF module and the switch.

[0011] Optionally, the matching circuit includes a first π-type filter, a DC blocking capacitor and a second π-type filter connected in series in sequence, the first π-type filter and the second π-type filter are respectively connected to the second signal terminal and the third connection terminal, the first π-type filter and the second π-type filter are used to filter out multiple harmonic signals in the matching circuit, and the DC blocking capacitor is used to isolate the DC signal in the matching circuit.

[0012] Optionally, the matching circuit further includes a notch filter, the input end of the notch filter is connected to the connection point between the DC blocking capacitor and the second π-type filter, and the notch filter is used to filter out signals with a set frequency in the matching circuit.

[0013] The present invention is provided with a switch to switch the connection between the coil and the wireless charging module and the radio frequency module. The first connection end of the switch is connected to the coil, the first signal end of the wireless charging controller is connected to the second connection end of the switch, and the second signal end of the radio frequency controller is connected to the third connection end of the switch. When the switch switches the first connection end to be connected with the second connection end, the wireless charging controller transmits and receives handshake signals through the second connection end, and outputs the current signal input by the first signal end to the load through the power supply output end. When the switch switches the first connection end to be connected with the third connection end, the radio frequency controller transmits and receives radio frequency signals through the third connection end. The setting of the switch enables the radio frequency module and the wireless charging module to share a coil, thereby reducing the design of the radio frequency antenna while improving the radio frequency performance and optimizing the overall structure of the coil device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic block diagram of a coil device with radio frequency and wireless charging functions according to an embodiment of the present invention.

[0015] Figure 2 1 is a circuit structure diagram of a coil module in a coil device with radio frequency and wireless charging functions according to an embodiment of the present invention.

[0016] Figure 3 The circuit structure diagram of the wireless charging module in the coil device with radio frequency and wireless charging functions according to an embodiment of the present invention.

[0017] Figure 4 The circuit structure diagram of the matching circuit of the radio frequency module in the coil device with radio frequency and wireless charging functions according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] In order to explain the technical content, structural features, achieved objectives and effects of the present invention in detail, the following is a detailed description in conjunction with the implementation methods and the accompanying drawings.

[0019] See also Figures 1 to 4 The present invention discloses a coil device with radio frequency and wireless charging functions, which comprises:

[0020] The coil module 1 includes a coil 11 and a switch 12. The switch 12 includes a first connection end 121, a second connection end 122 and a third connection end 123. The first connection end 121 is connected to the coil 11. The switch 12 is used to switch the first connection end 121 to be connected to the second connection end 122 or to the third connection end 123.

[0021] The wireless charging module 2 includes a wireless charging controller 21. The wireless charging controller 21 is provided with a power supply output terminal 22 and a first signal terminal 23. The first signal terminal 23 is connected to the second connection terminal 122. The power supply output terminal 22 is connected to the load. When the first connection terminal 121 is connected to the second connection terminal 122, the wireless charging controller 21 is used to transmit and receive handshake signals through the second connection terminal 122, and to output the current signal input by the first signal terminal 23 to the power supply output terminal 22.

[0022] The RF module 3 includes a RF controller 31, which is provided with a second signal terminal 32, and the second signal terminal 32 is connected to the third connection terminal 123. When the first connection terminal 121 is connected to the third connection terminal 123, the RF controller 31 is used to transmit and receive RF signals through the third connection terminal 123.

[0023] The present invention is provided with a switch 12 to switch the connection between the coil 11 and the wireless charging module 2 and the radio frequency module 3. The first connection end 121 of the switch 12 is connected to the coil 11, the first signal end 23 of the wireless charging controller 21 is connected to the second connection end 122 of the switch 12, and the second signal end 32 of the radio frequency controller 31 is connected to the third connection end 123 of the switch 12. When the switch 12 switches the first connection end 121 to be connected with the second connection end 122, the wireless charging controller 21 transmits and receives handshake signals through the second connection end 122, and outputs the current signal input by the first signal end 23 to the load through the power supply output end 22. When the switch 12 switches the first connection end 121 to be connected with the third connection end 123, the radio frequency controller 31 transmits and receives radio frequency signals through the third connection end 123. The setting of the switch 12 enables the radio frequency module 3 and the wireless charging module 2 to share a coil 11, thereby reducing the radio frequency antenna design while improving the radio frequency performance and optimizing the overall structure of the coil device.

[0024] See also Figures 1 to 4 The switch 12 includes a switching control terminal 120, which is connected to the controller MCU. The switch 12 is used to switch the first connection terminal 121 to be connected to the second connection terminal 122 according to a first signal received by the switching control terminal 120, and to switch the first connection terminal 121 to be connected to the third connection terminal 123 according to a second signal received by the switching control terminal 120.

[0025] By sharing the wireless charging coil 11 and switching the connection between the coil 11 and the wireless charging chip or the Bluetooth radio frequency path through the switch 12, the wireless charging function and the radio frequency function of the coil device are realized.

[0026] Optionally, the first signal is a high level signal, and the second signal is a low level signal, but not limited thereto. In some embodiments, the first signal is a low level signal, and the second signal is a high level signal.

[0027] Specifically, in this embodiment, the switch 12 is an analog switch, and the switching control end 120 includes an IN1 pin and an IN2 pin, and the IN1 pin and the IN2 pin are connected to the GPIO pin of the controller MCU. The controller MCU is responsible for sending a high-level signal to the IN1 pin and the IN2 pin at the same time to switch the coil 11 to realize the wireless charging function, or sending a low-level signal to the IN1 pin and the IN2 pin at the same time to switch the coil 11 to realize the radio frequency function.

[0028] Specifically, in this embodiment, the first connection terminal 121 includes a COM1 pin and a COM2 pin, and the coil 11 is welded to the COIL_A and COIL_B pad connection terminals, which are correspondingly connected to the COM1 pin and the COM2 pin. The current signal and the handshake signal generated by the coil 11 will enter the COM1 pin and the COM2 pin, and the RF signal generated by the RF controller 31 and the handshake signal generated by the wireless charging controller 21 will also enter the coil 11 through the COM1 pin and the COM2 pin to complete the signal transmission, but is not limited to this.

[0029] The wireless charging coil 11 is a wound copper wire, and has better overall performance when used as an antenna. Therefore, an analog switch is used to multiplex the RF antenna and the wireless charging coil, which is beneficial to reducing the RF antenna design while improving the RF performance.

[0030] Specifically, in this embodiment, the second connection end 122 includes a NO1 pin and a NO2 pin, the wireless charging controller 21 is a wireless charging chip, and the wireless charging chip is provided with two ACN pins and two ACP pins, which are respectively connected in parallel to form a WPC_N pin and a WPC_P pin, and the WPC_N pin and the WPC_P pin are respectively connected to the NO2 pin and the NO1 pin, and when the switching coil 11 realizes the wireless charging function, the NO1 pin and the NO2 pin are connected to the COM1 pin and the COM2 pin;

[0031] The wireless charging chip sends a handshake signal to the coil 11 through the WPC_N pin and the WPC_P pin, and receives the handshake signal output by the coil 11 through the WPC_N pin and the WPC_P pin. The wireless charging chip completes the handshake communication before wireless charging by parsing these handshake signals;

[0032] The power output terminal 22 includes three VOUT pins. When wireless charging starts, the current signals of the COM1 pin and the COM2 pin are transmitted to the wireless charging chip through the WPC_N pin and the WPC_P pin, and are output to the battery or used for system power through the VOUT pin, but not limited to this.

[0033] See also Figures 1 to 4 The RF module 3 also includes a matching circuit 33 , two ends of the matching circuit 33 are respectively connected to the third connection end 123 and the second signal end 32 , and the matching circuit 33 is used to match the impedance between the RF module 3 and the switch 12 .

[0034] Specifically, in the present embodiment, the controller MCU includes a radio frequency controller 31, the controller MCU is provided with a TRX pin, one end of the matching circuit 33 is connected to the TRX pin, and the other end is formed as an ANT terminal, the third connection terminal 123 includes an NC1 pin and an NC2 pin, the ANT terminal is connected to the NC1 pin, and the NC2 pin is grounded, when the switching coil 11 realizes the radio frequency function, the NC1 pin and the NC2 pin are connected to the COM1 pin and the COM2 pin, the controller MCU outputs a Bluetooth radio frequency signal through the TRX pin, and receives the Bluetooth radio frequency signal output to the NC1 pin by the ANT terminal receiving coil 11, therefore, the inductor and the capacitor are adjusted according to different antennas and design parameters to form a radio frequency matching circuit 33 in combination to improve the radio frequency performance of the coil device.

[0035] See also Figures 1 to 4 The matching circuit 33 includes a first π-type filter 331, a DC blocking capacitor C13 and a second π-type filter 332 which are connected in series in sequence. The first π-type filter 331 and the second π-type filter 332 are respectively connected to the second signal terminal 32 and the third connection terminal 123. The first π-type filter 331 and the second π-type filter 332 are used to filter out multiple harmonic signals in the matching circuit 33, and the DC blocking capacitor C13 is used to isolate the DC signal in the matching circuit 33.

[0036] Specifically, in this embodiment, generally speaking, the matching circuit 33 is configured with a first π-type filter 331, a DC blocking capacitor C13, and a second π-type filter 332 connected in series in sequence. However, for different antennas and design parameters, the antenna can be adapted by adjusting the parameters of the inductor and capacitor in the matching circuit 33 to enhance the OTA and directivity of the antenna. For example, the inductor is set to 3NH and the capacitor is set within the range of 0.5pf-3pf, but is not limited thereto.

[0037] Specifically, in this embodiment, Figure 4 As shown, the first π-type filter 331 and the second π-type filter 332 both include an inductor L1 (L3) and two capacitors C10, C11 (C16, C17) respectively connected to the two ends of the inductor L1 (L3), the other ends of the two capacitors C10, C11 (C16, C17) are grounded, and the inductor L1 (L3) and the DC blocking capacitor C13 are arranged in series, but not limited to this.

[0038] Optionally, the matching circuit 33 also includes a notch filter 333 (notch filter circuit), the input end of the notch filter 333 is connected to the connection point between the DC blocking capacitor C13 and the second π-type filter 332, and the notch filter 333 is used to filter out the signal with a set frequency in the matching circuit 33.

[0039] Specifically, in this embodiment, Figure 4As shown, the notch filter 333 includes a capacitor C14 and an inductor L4 connected in series, but is not limited to this. In addition to adding a notch filter 333 according to different antennas, an inductor L2 and a capacitor C15 set in series in the matching circuit 33 can also be added, and an inductor L5 and a capacitor C12 with one end grounded and the other end connected in parallel to the matching circuit 33 can be added.

[0040] See also Figures 1 to 4 The present invention discloses an earphone charging box, which comprises: a charging box body and a coil device with radio frequency and wireless charging functions as mentioned above, which is arranged on the charging box body.

[0041] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A coil device with radio frequency and wireless charging functions, characterized in that: include: A coil module, the coil module comprising a coil and a switch, the switch comprising a first connection end, a second connection end and a third connection end, the first connection end being connected to the coil, and the switch being used to switch the first connection end to be connected to the second connection end or to the third connection end; A wireless charging module, the wireless charging module comprising a wireless charging controller, the wireless charging controller being provided with a power supply output terminal and a first signal terminal, the first signal terminal being connected to the second connection terminal, the power supply output terminal being connected to a load, and when the first connection terminal is connected to the second connection terminal, the wireless charging controller is used to transmit and receive a handshake signal through the second connection terminal, and is used to output a current signal input by the first signal terminal to the power supply output terminal; The RF module includes a RF controller, the RF controller is provided with a second signal end, the second signal end is connected to the third connection end, when the first connection end is connected to the third connection end, the RF controller is used to transmit and receive RF signals through the third connection end.

2. The coil device with radio frequency and wireless charging functions according to claim 1, characterized in that: The switch includes a switching control end, which is connected to a controller. The switch is used to switch the first connection end to be connected to the second connection end according to a first signal received by the switching control end, and to switch the first connection end to be connected to the third connection end according to a second signal received by the switching control end.

3. The coil device with radio frequency and wireless charging functions according to claim 2, characterized in that: The first signal is a high level signal, and the second signal is a low level signal.

4. The coil device with radio frequency and wireless charging functions according to claim 1, characterized in that: The RF module also includes a matching circuit, two ends of which are respectively connected to the second signal end and the third connection end, and the matching circuit is used to match the impedance between the RF module and the switch.

5. The coil device with radio frequency and wireless charging functions according to claim 4, characterized in that: The matching circuit includes a first π-type filter, a DC blocking capacitor and a second π-type filter connected in series in sequence, the first π-type filter and the second π-type filter are respectively connected to the second signal end and the third connection end, the first π-type filter and the second π-type filter are used to filter out multiple harmonic signals in the matching circuit, and the DC blocking capacitor is used to isolate the DC signal in the matching circuit.

6. The coil device with radio frequency and wireless charging functions according to claim 5, characterized in that: The matching circuit also includes a notch filter, the input end of the notch filter is connected to the connection point between the DC blocking capacitor and the second π-type filter, and the notch filter is used to filter out signals with a set frequency in the matching circuit.

7. An earphone charging box, characterized in that: include: A charging box body and a coil device with radio frequency and wireless charging functions as described in any one of claims 1 to 6 arranged on the charging box body.

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