Wireless communication circuit, WiFi module and unmanned equipment

Abstract

The invention relates to the technical field of wireless communication, and provides a wireless communication circuit, a WiFi module and unmanned equipment. The wireless communication circuit comprises a main control chip circuit and a radio frequency front-end chip circuit which are connected through a radio frequency line, the main control chip circuit comprises a main signal generation circuit and a signal fusion circuit, and the main signal generation circuit is used for outputting a communication signal to the signal fusion circuit; the signal fusion circuit fuses the control signal and the power supply signal of the communication signal and the communication signal to obtain a fusion signal, and outputs the fusion signal to the radio frequency front-end chip circuit through a radio frequency line; the radio frequency front-end chip circuit comprises a radio frequency circuit and a signal extraction circuit, the signal extraction circuit decouples a fusion signal, extracts a control signal, a communication signal and a power supply signal, outputs the control signal, the communication signal and the power supply signal to the radio frequency circuit and sends out the control signal, the communication signal and the power supply signal, and therefore communication between the main control chip circuit and the radio frequency front-end chip circuit can be achieved only through one radio frequency line. And the circuit layout of the circuit board is simplified.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technology, and in particular to a wireless communication circuit, a WiFi module and an unmanned device. Background Art

[0002] With the development of wireless communication technology, especially WiFi communication, the current WiFi communication circuit is mainly composed of WiFi main control chip and WiFi RF front-end chip, and a communication connection needs to be set between the two chips. The communication between the two chips includes the transmission of WiFi signals, control signals and power supply communication connections. In order to ensure the normal and stable operation of the two chips, RF lines, control signal lines and power lines are set to transmit the corresponding signals separately.

[0003] When the WiFi main control chip and the WiFi RF front-end chip are designed in the same circuit board, the RF line, control signal line and power line are routed in the circuit board, which increases the complexity of the routing layout and limits the integration and miniaturization of the circuit.

[0004] When the WiFi main control chip and WiFi RF front-end chip are designed in separate circuit boards, such as Figure 1 As shown, between the WiFi main control chip board and the WiFi RF front-end chip board, the WIFI signal line is usually connected with a dedicated RF cable, while the power line and the WIFI control signal line are connected with an ordinary signal cable. However, in this way, when designing the circuit connection of the two chips, corresponding lines need to be set, and the setting of multiple lines increases the complexity and routing cost of the external wiring layout of the circuit board. Summary of the invention

[0005] The present invention provides a wireless communication circuit, a WiFi module and an unmanned device, which are used to solve the problem that too many connection lines between a main control part and a radio frequency part in the existing wireless communication circuit lead to complex line layout.

[0006] A first aspect of the present invention provides a wireless communication circuit, comprising: a main control chip circuit and a radio frequency front-end chip circuit, wherein the main control chip circuit and the radio frequency front-end chip circuit are connected via a radio frequency line;

[0007] The main control chip circuit includes a main signal generating circuit and a signal fusion circuit, wherein the main signal generating circuit is used to output a communication signal to the signal fusion circuit; the signal fusion circuit is used to fuse the control signal and power signal of the communication signal, and the communication signal to obtain a fusion signal, and output it to the RF front-end chip circuit through the RF line; wherein the power signal is used to provide a working voltage for a load on the RF front-end chip circuit side;

[0008] The RF front-end chip circuit includes a RF circuit and a signal extraction circuit. The signal extraction circuit decouples the fused signal, extracts the control signal, the communication signal and the power signal, and outputs them to the RF circuit. The RF circuit sends out the communication signal under the control of the control signal.

[0009] Optionally, the main control chip circuit and the radio frequency front-end chip circuit are arranged on the same or different circuit boards.

[0010] Optionally, the signal fusion circuit includes:

[0011] A power circuit, used for generating a power signal;

[0012] A first fusion circuit is used to fuse the obtained multiple control signals with different frequencies to obtain a fused control signal;

[0013] The second fusion circuit, the input end of the second fusion circuit is connected to the output end of the first fusion circuit and the output end of the main signal generating circuit, and is used to fuse the fusion control signal, the communication signal and the power supply signal to obtain a fusion signal.

[0014] Optionally, the first fusion circuit includes:

[0015] At least two active crystal oscillator circuits, each of which has a different operating frequency and is used to generate control signals of different frequencies;

[0016] A first multiplexer, each input end of the first multiplexer is connected to an active crystal oscillator circuit, and the output end of the first multiplexer is connected to the second fusion circuit, and is used to couple and process multiple control signals of different frequencies to obtain a fused control signal.

[0017] Optionally, the first fusion circuit also includes a switching circuit arranged between each of the active crystal oscillator circuits and the input end of the first multiplexer, which is used to control the corresponding active crystal oscillator circuit to be connected or grounded to the input end of the first multiplexer based on an external input IO signal.

[0018] Optionally, the second fusion circuit includes:

[0019] The first duplexer has two input ends respectively connected to the output end of the first multiplexer and the output end of the main signal generating circuit, and is used to couple the fusion control signal and the communication signal, and fuse the coupled signal with the power supply signal to obtain a fusion signal.

[0020] Optionally, the second fusion circuit further includes: an isolation circuit for isolating a DC signal in the communication signal and the coupled signal.

[0021] Optionally, the isolation circuit includes a first isolation branch and a second isolation branch;

[0022] The first isolation branch is provided between the output end of the main signal generating circuit and the input end of the first duplexer, and is used to filter out the DC signal in the communication signal;

[0023] The second isolation branch is arranged at the output end of the first duplexer and is used for filtering out a DC signal in the coupled signal.

[0024] Optionally, the second isolation branch includes: a first capacitor provided between the output end of the first duplexer and the input end of the signal extraction circuit, used to isolate the DC signal in the coupled signal from flowing into the signal extraction circuit; a first inductor provided between the common end of the first capacitor and the signal extraction circuit and the output end of the power supply circuit, used to isolate the high-frequency signal in the coupled signal from flowing into the power supply;

[0025] and / or,

[0026] The first isolation branch includes a second capacitor disposed between an output end of the main signal generating circuit and an input end of the first duplexer.

[0027] Optionally, the signal extraction circuit includes:

[0028] a first separation circuit connected to the output end of the signal fusion circuit and used for separating a power signal from the fusion signal;

[0029] a second separation circuit connected to the output end of the signal fusion circuit, used for separating a communication signal and a fusion control signal from the fusion signal, and outputting the communication signal to the radio frequency circuit;

[0030] The third separation circuit is connected to the output end of the second separation circuit and is used to separate a plurality of control signals with different frequencies from the fused control signal.

[0031] Optionally, the first separation circuit includes at least a second inductor for isolating a high-frequency signal in the fused signal to obtain a power supply signal.

[0032] Optionally, the second separation circuit is a second duplexer, an input end of which is connected to the output end of the signal fusion circuit, one output end is connected to the radio frequency circuit, and the other output end is connected to the input end of the third separation circuit.

[0033] Optionally, the signal extraction circuit further includes:

[0034] A filtering and amplifying circuit is provided between the output end of the second separation circuit and the input end of the third separation circuit, and is used for filtering and amplifying the fusion control signal.

[0035] Optionally, the signal extraction circuit further includes:

[0036] The signal detection circuit is arranged at each output end of the third separation circuit, and is used to restore the control signal of the corresponding frequency from the fused control signal by using a voltage comparison method, and output it to the radio frequency circuit.

[0037] Optionally, the third separation circuit is a second multiplexer, an input end of which is connected to an output end of the second separation circuit, and each output end of the second separation circuit is provided with a signal detection circuit.

[0038] A second aspect of the present invention provides a WiFi module, comprising the wireless communication circuit and an antenna as described in the first aspect, wherein the antenna is connected to the output end of the radio frequency circuit.

[0039] A third aspect of the present invention provides an unmanned device, comprising at least one WiFi module as described in the second aspect.

[0040] In the technical solution provided by the present invention, the wireless communication circuit includes: a main control chip circuit and a radio frequency front-end chip circuit, the main control chip circuit and the radio frequency front-end chip circuit are connected through a radio frequency line; the main control chip circuit includes a main signal generating circuit and a signal fusion circuit, the main signal generating circuit is used to output a communication signal to the signal fusion circuit; the signal fusion circuit is used to fuse the control signal and power signal of the obtained communication signal, as well as the communication signal, to obtain a fusion signal, and output it to the radio frequency front-end chip circuit through the radio frequency line; wherein the power signal is used to provide a working voltage for the load on the radio frequency front-end chip circuit side; the radio frequency front-end chip circuit includes a radio frequency circuit and a signal extraction circuit, the signal extraction circuit decouples the fusion signal, extracts the control signal, the communication signal and the power signal, and outputs it to the radio frequency circuit; the radio frequency circuit sends the communication signal under the control of the control signal. The present application sets a signal fusion circuit on the main control chip circuit to fuse the control signal, power signal and communication signal, and then outputs it to the RF front-end chip circuit through the RF line. The control signal, power signal and communication signal are then separated by the signal extraction circuit on the RF front-end chip circuit, thereby realizing communication between the main control chip circuit and the RF front-end chip circuit with only one RF line, avoiding the complex design of setting up multiple lines for multiple signals in the prior art, simplifying the wiring layout of the circuit board, and also reducing the wiring cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1A schematic diagram showing the connection between an existing WiFi main control chip board and a WiFi radio frequency front-end chip board;

[0042] Figure 2 This is a schematic diagram of a first structure of a wireless communication circuit in an embodiment of the present invention;

[0043] Figure 3 is a schematic diagram of a second structure of a wireless communication circuit in an embodiment of the present invention;

[0044] Figure 4 A schematic diagram of a structure in which a signal fusion circuit is connected to a signal extraction circuit in an embodiment of the present invention;

[0045] Figure 5 It is a partial structural diagram of a wireless communication circuit in an embodiment of the present invention;

[0046] Figure 6 It is a structural schematic diagram of another signal fusion circuit connected to a signal extraction circuit in an embodiment of the present invention;

[0047] Figure 7 Schematic diagram of the structure of a WiFi module in an embodiment of the present invention. DETAILED DESCRIPTION

[0048] The embodiments of the present invention provide a wireless communication circuit, a WiFi module and an unmanned device. A signal fusion circuit is set on the main control part of the existing wireless communication circuit to fuse the control, power supply and communication signals on the main control chip circuit, and a corresponding signal extraction circuit is set on the radio frequency part to achieve connection and transmission of various signals between the two parts through only one communication line, thereby solving the problem of too many connection lines between the main control part and the radio frequency part in the prior art, resulting in complex line layout.

[0049] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" or "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0050] like Figure 2A structural schematic diagram of a wireless communication circuit provided in the present application, wherein the wireless communication circuit includes a main control chip circuit 100 and a radio frequency front-end chip circuit 200, and the main control chip circuit 100 and the radio frequency front-end chip circuit 200 are connected via a radio frequency line;

[0051] The main control chip circuit 100 includes a main signal generating circuit 110 and a signal fusion circuit 120. The main signal generating circuit 110 is used to output a communication signal to the signal fusion circuit 120; the signal fusion circuit 120 is used to fuse the control signal and the power signal of the obtained communication signal, and the communication signal to obtain a fusion signal, and output it to the RF front-end chip circuit 200 through the RF line; wherein the power signal is used to provide a working voltage for the load on the RF front-end chip circuit 200 side;

[0052] The RF front-end chip circuit 200 includes a RF circuit 210 and a signal extraction circuit 220. The signal extraction circuit 220 decouples the fused signal, extracts the control signal, the communication signal and the power signal, and outputs them to the RF circuit 210. The RF circuit 210 sends the communication signal under the control of the control signal.

[0053] Specifically, a transmission interface is provided on the main control chip circuit 100 and the RF front-end chip circuit 200 for realizing the communication connection between the two circuits. The transmission interface can specifically be an SMA interface that matches the RF line. The main control chip circuit 100 and the RF front-end chip circuit 200 are connected via a RF line 300 for transmitting communication signals, control signals and power signals between the two circuits.

[0054] In this embodiment, the main control chip circuit 100 includes a circuit with a signal fusion function composed of a wireless communication chip combined with other circuits. The main control chip circuit 100 generates communication signals, control signals and power signals for communication respectively. After the main control chip circuit 100 generates these three types of signals, it will fuse the three types of signals through the signal fusion circuit to obtain a fused signal, and then transmit it to the RF front-end chip circuit 200 through the RF line 300.

[0055] After receiving the fused signal transmitted from the main control chip circuit 100 through the RF line 300, the RF front-end chip circuit 200 parses the fused signal according to the transmission protocol between the main control chip circuit 100 and the RF front-end chip circuit 200 to separate three types of signals, thereby controlling the RF front-end chip circuit 200 and sending out the communication signal therein.

[0056] For example, in WiFi wireless communication, the main control chip circuit 100 is a circuit module designed by a WiFi chip, and the RF front-end chip circuit 200 is a circuit module designed by a WiFi front-end chip. The two are connected by a RF line 300. When working, a WiFi communication signal, a power signal, and a control signal for controlling the reception and transmission and the working frequency band of the entire communication circuit will be generated on the circuit module on the WiFi chip side. The main control chip circuit 100 first merges the generated control signal, then merges it with the generated WiFi communication signal, and finally merges it with the power signal to output a fused signal to the RF front-end chip circuit 200. The RF front-end chip circuit 200 performs reverse separation based on the fusion logic on the main control chip circuit 100 to obtain different signals.

[0057] The main signal generating circuit 110 includes a communication chip for wireless communication, such as a WiFi chip, or even a pulse signal generator, etc. The main signal generating circuit 110 generates a communication signal of a corresponding frequency according to communication requirements, such as a 2G / 5G signal, and then outputs it to the signal fusion circuit 120. The signal fusion circuit 120 is a signal processing module with multiple input terminals and one output terminal. One of the multiple input terminals is connected to the output terminal of the main signal generating circuit 110, one is connected to a power supply, and the remaining input terminals are connected to a control signal generating circuit, that is, the remaining input terminals will generate control signals to control the transmission of communication signals in the corresponding frequency band. Inside the signal fusion circuit 120, the signals in each input terminal are fused to output a fused signal.

[0058] Specifically, when fusing the signals, the signal fusion circuit 120 first fuses multiple control signals to obtain a fused control signal, then fuses the fused control signal with the communication signal output by the main signal generating circuit 110, and finally fuses it with the power supply signal and inputs it into the RF line 300, thereby realizing the transmission of multiple signals through one RF line interface.

[0059] In this embodiment, the input end of the signal extraction circuit 220 is connected to the output end of the signal fusion circuit 120, and the output end of the signal extraction circuit 220 is connected to the RF circuit 210. The signal extraction circuit 220 separates and processes the received fusion signal to extract the control signal, the communication signal and the power signal, and outputs them to corresponding positions respectively. For example, the control signal is output to the control end of the RF circuit 210, and under the control of the control signal, the RF circuit 210 modulates the communication signal, converts it into a RF signal and sends it out, while the power signal powers each circuit.

[0060] In this solution, a signal fusion circuit is set on the main control chip circuit to fuse the control signal, power signal and communication signal, and then output it to the RF front-end chip circuit through the RF line. The control signal, power signal and communication signal are then separated by the signal extraction circuit on the RF front-end chip circuit, thereby achieving communication between the main control chip circuit and the RF front-end chip circuit with only one RF line, avoiding the complex design of setting up multiple lines for multiple signals in the prior art, simplifying the wiring layout of the circuit board, and also reducing the wiring cost.

[0061] Optionally, the main control chip circuit 100 and the RF front-end chip circuit 200 are arranged on the same or different circuit boards.

[0062] In one embodiment, the main control chip circuit 100 and the RF front-end chip circuit 200 are arranged on the same circuit board. A line having the function of a radio frequency line can be directly arranged between the main control chip circuit 100 and the RF front-end chip circuit 200 by means of circuit laying, thereby reducing the complexity of the wiring layout in the circuit board, which is also conducive to the development of integrated and miniaturized circuit boards.

[0063] In another embodiment, the main control chip circuit 100 and the RF front-end chip circuit 200 are arranged on different circuit boards. In this case, interfaces of RF lines can be respectively arranged on the main control chip circuit 100 and the RF front-end chip circuit 200, and connected to the RF lines through the interfaces to realize the co-line use of different signals of the two, thereby reducing the complexity of the external wiring layout of the circuit board and reducing the wiring cost.

[0064] Through the implementation of the wireless communication circuit provided above, a signal fusion circuit is set on the main control chip circuit to fuse the control signal, power signal and communication signal, and then output it to the RF front-end chip circuit through the RF line. The control signal, power signal and communication signal are then separated by the signal extraction circuit on the RF front-end chip circuit, thereby achieving communication between the main control chip circuit and the RF front-end chip circuit with only one RF line, avoiding the complex design of setting up multiple lines for multiple signals in the prior art, simplifying the wiring layout of the circuit board, and also reducing the wiring cost.

[0065] like Figure 3-Figure 5As shown, another implementation of the wireless communication circuit provided in the embodiment of the present application, the signal fusion circuit 120 in the wireless communication circuit is a combination circuit of multi-stage fusion, and each stage can fuse at least two signals, and the two signals can be signals of the same type or signals of different types. Signals of the same type should be understood as being the same power signal, the same control signal, or the same communication signal, while different types are combinations of power signals, control signals, and communication signals. In practical applications, the fusion rule of the signal fusion circuit 120 is to fuse signals of the same type first, and then fuse them in the order of control signal-communication signal-power signal.

[0066] like Figure 3 As shown, the signal fusion circuit 120 includes a power supply circuit 121, a first fusion circuit 122 and a second fusion circuit 123, wherein the output end of the first fusion circuit 122 is connected to the input end of the second fusion circuit 123, the input end of the second fusion circuit 123 is also connected to the main signal generating circuit 110, and the output end of the second fusion circuit is connected to the output end of the power supply circuit 121 and the input end of the signal extraction circuit 220.

[0067] Among them, the power supply circuit 121 is used to output a power supply signal, mainly to provide a working voltage for the load on the RF front-end chip circuit 200; the first fusion circuit 122 is used to fuse the obtained multiple control signals of different frequencies to obtain a fused control signal; the second fusion circuit 123 is used to fuse the fused control signal, the communication signal and the power supply signal to obtain a fused signal.

[0068] In actual applications, the first fusion circuit 122 is a multi-input single-output circuit, each input is provided with a clock source, and a control signal for controlling the corresponding frequency signal is generated by the clock source, such as the first control signal for controlling the 2G WiFi output and the second control signal for controlling the 5G WiFi output.

[0069] Optionally, a first fusion circuit 122 with two frequency band control signals is selected here, that is, two control signals of different frequency bands are generated at the input end of the first fusion circuit 122, which may specifically be two clock signals of 26Mhz and 40Mhz, and then the control signals of the two frequency bands are fused through the first fusion circuit 122 to output a fused control signal.

[0070] The second fusion circuit 123 is also a circuit with multiple input terminals and one output terminal, one of the input terminals is connected to the main signal generating circuit 110, and the other input terminals are connected to the first fusion circuit 123. The second fusion circuit 123 fuses the communication signal output by the main signal generating circuit 110 and the fusion control signal of the first fusion circuit 123, and finally fuses it with the power supply signal on the output side of the second fusion circuit 123 to obtain a fusion signal, and outputs it to the RF circuit 210 through the RF line.

[0071] In another embodiment, if Figure 4 As shown, the first fusion circuit 122 includes a first multiplexer 1221 and at least two active crystal oscillator circuits 1222, wherein the first multiplexer 1221 is a filter with multiple inputs and a single output, which is used to couple and output multiple signals, and an active crystal oscillator circuit 1222 is provided on each input end of the first multiplexer 1221, and the control signal frequency generated by the active crystal oscillator circuit 1222 of each input end is different, which is used to control the communication of the communication signal of the corresponding frequency. After the control signal of each frequency is input into the first multiplexer 1221, the control signals of multiple different frequencies are coupled and processed to obtain a fusion control signal, which is output to the second fusion circuit 123.

[0072] Furthermore, the first fusion circuit 122 also includes a switching circuit provided between each active crystal oscillator circuit 1222 and the input end of the first multiplexer 1221, which is used to control the corresponding active crystal oscillator circuit 1222 and the input end of the first multiplexer 1221 to be turned on or grounded based on an external input IO signal.

[0073] The second fusion circuit 123 includes a first duplexer 1231, whose two input ends are respectively connected to the output end of the first multiplexer 1221 and the output end of the main signal generating circuit 110, and is used to couple the fusion control signal and the communication signal, and fuse the coupled signal with the power supply signal to obtain a fusion signal.

[0074] In this embodiment, the second fusion circuit 123 further includes an isolation circuit 1232 for isolating the communication signal and the DC signal in the coupled signal. In practical applications, the isolation circuit 1232 is provided between the main signal generating circuit 110 and the input end of the first duplexer 1231 and at the output end of the first duplexer 1231, respectively, for isolating the communication signal and the DC signal in the coupled signal, such as Figure 5 shown.

[0075] In another embodiment, the isolation circuit 1232 includes a first isolation branch 1232a and a second isolation branch 1232b;

[0076] The first isolation branch 1232a is provided between the output end of the main signal generating circuit 110 and the input end of the first duplexer 1221, and is used to filter out the DC signal in the communication signal;

[0077] The second isolation branch 1232 b is provided at the output end of the first duplexer 1221 and is used to filter out a DC signal in the coupled signal.

[0078] The second isolation branch 1232b includes: a first capacitor provided between the output end of the first duplexer 1221 and the input end of the signal extraction circuit 220, used to isolate the DC signal in the coupled signal from flowing into the signal extraction circuit 220; a first inductor provided between the common end of the first capacitor and the signal extraction circuit 220 and the output end of the power supply circuit 121, used to isolate the high-frequency signal in the coupled signal from flowing into the power supply;

[0079] and / or,

[0080] The first isolation branch 1232 a includes a second capacitor disposed between the output end of the main signal generating circuit 110 and the input end of the first duplexer 1221 .

[0081] In this embodiment, the signal extraction circuit 220 is a multi-stage separation circuit matched with the signal fusion circuit 120, and the signal extraction circuit 220 separates the power signal, the communication signal and the control signal from the fusion signal step by step.

[0082] like Figure 3 As shown, the signal extraction circuit 220 includes a first separation circuit 221, a second separation circuit 222 and a third separation circuit 223, wherein:

[0083] A first separation circuit 221, connected to the output end of the signal fusion circuit 120, and used for separating a power signal from the fusion signal;

[0084] A second separation circuit 222, connected to the output end of the signal fusion circuit 120, for separating a communication signal and a fusion control signal from the fusion signal, and outputting the communication signal to the radio frequency circuit;

[0085] The third separation circuit 223 is connected to the output end of the second separation circuit 222 and is used to separate a plurality of control signals of different frequencies from the fused control signal.

[0086] like Figure 4As shown, the first separation circuit 221 is an inductive device, which at least includes a second inductor, which is used to isolate the high-frequency signal in the fusion signal and pass the DC signal, thereby realizing the separation of the power supply signal. The second separation circuit 222 is a second duplexer, which has a single input and two outputs and is used to separate the communication signal and the fusion control signal from the high-frequency signal in the fusion signal. The communication signal is output from one output end to the RF circuit 210, and the fusion control signal is output from another output end to the third separation circuit 223.

[0087] The third separation circuit 223 is a second multiplexer, which is a single-input and multi-output device. Its input end is connected to the output end of the second separation circuit 222, and each output end is provided with a signal detection circuit 225 for separating the fused control signal into multiple control signals of different frequencies, specifically by using a voltage comparison method for separation.

[0088] Furthermore, in order to ensure the separation accuracy of the control signal by the third separation circuit 223, a filter amplifier circuit 224 is provided between the output end of the second separation circuit 222 and the input end of the third separation circuit 223, for filtering and amplifying the fused control signal. Figure 5 shown.

[0089] In another embodiment, the voltage comparison method can be specifically implemented by setting up a circuit with a comparator, that is, a signal detection circuit 225 is provided at each output end of the third separation circuit 223, which is used to use the voltage comparison method to restore the control signal of the corresponding frequency from the fused control signal and output it to the RF circuit 210.

[0090] In summary, by setting up a signal fusion circuit on the existing wireless communication circuit, multiple different types of signals on the main control are merged into one signal and sent to the RF front end for signal extraction. This method not only realizes that only one RF line interface is needed to realize communication between the main control chip circuit and the RF front-end chip circuit, but also avoids the complex design of setting one line for each signal in the prior art, simplifies the wiring layout between the two boards, and also reduces the difficulty of assembly between the boards.

[0091] The following uses WiFi, which is compatible with 2G WiFi and 5G WiFi communications, as an example to describe in detail the structure and working principle of the wireless communication circuit provided in this application.

[0092] The wireless communication circuit (i.e., WiFi communication circuit) provided in this embodiment mainly consists of two parts, one of which includes a circuit for fusing the power supply and control signal on the WiFi main control chip to the WiFi signal, which is the signal fusion circuit 120 in the above embodiment. Another part includes a circuit for extracting the fused power supply and control signal and the WiFi signal from the WiFi front-end chip board, which is the signal extraction circuit 220 in the above embodiment.

[0093] The signal fusion circuit 120 first modulates the signals of the two active crystal oscillator control signals of different frequencies. Whether the signals generated by the two crystal oscillators are outputted is determined by the module switch, and whether the module switch is connected to the output terminal or 50Ω grounding is controlled by the control signal of WIFI. When more control signals need to be fused, more frequency sources can be selected.

[0094] In order to prevent the signals from affecting each other, the clock source signal and the WIFI signal need to pass through the duplexer before they can be integrated into one signal. The fusion of the power signal and the WIFI signal is to first isolate the DC power through a capacitor, and then pass the 24V DC power supply through an inductor and then through a DC isolation capacitor. The role of the inductor is low-pass filtering, isolating high-frequency signals from flowing into the power supply. Finally, all the fused signals are connected to the RF line through the SMA head (RF connector).

[0095] The signal extraction circuit 220 extracts the fused signal. The fused signal is input from the SMA head. The input signal first extracts the DC power supply. Similarly, after the high-frequency signal is isolated by the inductor, the DC power supply is output to the electrical equipment on the front-end board. The DC power passes through the DC blocking capacitor and only passes the AC signal. The WIFI signal and the control signal are separated by the duplexer of the WIFI and low-frequency signals, and the WIFI signal is given to the RF front end for use. After the control signal is filtered and amplified, it is detected by the corresponding duplexer, and finally the voltage is compared to restore the control signal to the RF front end for use.

[0096] In this embodiment, the first fusion circuit 122 includes a first multiplexer 1221 and at least two active crystal oscillator circuits 1222, wherein the first multiplexer 1221 is a filter with multiple inputs and a single output, which is used to couple and output multiple signals, and an active crystal oscillator circuit 1222 is provided at each input end of the first multiplexer 1221, and the control signal frequency generated by the active crystal oscillator circuit 1222 at each input end is different, which is used to control the communication of the communication signal of the corresponding frequency. After the control signal of each frequency is input into the multiplexer 1222, the control signals of multiple different frequencies are coupled and processed to obtain a fused control signal, which is output to the second fusion circuit 123.

[0097] like Figure 6As shown, it is another schematic diagram of the signal fusion circuit and the signal extraction circuit. Under this structure, the first fusion circuit 122 is composed of a 26M active crystal oscillator, a 40M active crystal oscillator and a 26M / 40M duplexer, wherein the 26M active crystal oscillator and the 40M active crystal oscillator are arranged on two input ends of the 26M / 40M duplexer, and a signal switch is also arranged between the 26M active crystal oscillator and the 26M / 40M duplexer, and between the 40M active crystal oscillator and the 26M / 40M duplexer. The Wifi2G control IO and the Wifi5G control IO in the figure are control signal switch connections. The clock signal of the active crystal oscillator circuit is the control signal of WiFi. When WiFi of the corresponding frequency band is not needed, the Wifi2G control IO or the Wifi5G control IO control signal switch is grounded, that is, the effective output of the clock signal (that is, the control signal of the above-mentioned control communication signal) generated by the 26M active crystal oscillator and the 40M active crystal oscillator is controlled by the signal switch and the corresponding control IO, and then the control signals output by the two active crystal oscillators are coupled through the 26M / 40M duplexer to achieve fusion output to the second fusion circuit 123.

[0098] The second fusion circuit 123 is composed of a WiFi / low-frequency duplexer, wherein one input end of the WiFi / low-frequency duplexer is connected to the output end of the 26M / 40M duplexer, and the other input end of the WiFi / low-frequency duplexer is connected. Since both the control signal and the WiFi signal are high-frequency signals, in order to eliminate the influence of the DC signal, a first isolation capacitor is also provided on the input end of the WiFi / low-frequency duplexer connected to the WiFi signal, which is used to isolate the DC signal in the WiFi signal, and then the fusion signal of the 26Mhz and 40Mhz clock source signals is fused with the WiFi signal in the WiFi / low-frequency duplexer.

[0099] Furthermore, a second isolation capacitor is provided at the output end of the WiFi / low-frequency duplexer to remove DC from the fused signal of the 26Mhz and 40Mhz clock source signals and the fused signal of the WiFi signal, and finally merge it with the power supply signal and output it to the signal extraction circuit 220.

[0100] In this embodiment, a power supply circuit, specifically a DC power supply circuit, is further provided in the signal fusion circuit 120 for outputting a DC power supply signal to be fused with the signal output by the WiFi / low-frequency duplexer. In practical applications, the power supply circuit may be composed of a DC power supply and a first inductor.

[0101] In this embodiment, the signal extraction circuit 220 is composed of a capacitor, a WiFi / low-frequency duplexer, a low-pass filter, an amplifier, a 26M / 40M duplexer, a detector and a comparator, wherein the capacitor and the WiFi / low-frequency duplexer constitute the second separation circuit, the low-pass filter and the amplifier constitute the filter amplification circuit, the 26M / 40M duplexer is the third separation circuit, and the detector and the comparator constitute the signal detection circuit. In addition, the first separation circuit is the load and the second inductor in the figure.

[0102] The fusion signal of the RF line input capacitor is processed by the capacitor to remove the DC signal and retain the high-frequency signal. The high-frequency signal is separated into the WiFi signal and the fusion signal of the 26Mhz and 40Mhz clock source signals through the WiFi / low-frequency duplexer. At this time, the fusion signal is low-pass filtered and amplifier, and then input into the 26M / 40M duplexer for decoupling. Finally, the decoupled signal is separated into 26Mhz and 40Mhz clock source signals after comparison by the detector and comparator. The first detector in the figure separates the 26Mhz clock source signal after comparison with the first comparator, and the second detector separates the 40Mhz clock source signal after comparison with the second comparator.

[0103] In summary, a duplexer is added to the WiFi chip to achieve signal coupling, so that it outputs a fused signal, which is then separated and extracted on the RF front-end chip to obtain the corresponding signal, thereby realizing the fusion of the three wires between the WiFi main control chip board and the WiFi front-end chip board into only one wire, the RF wire, reducing the complexity of external wires and the routing cost.

[0104] The present invention also provides a WiFi module, such as Figure 7 As shown, the WiFi module includes a wireless communication circuit 610 and an antenna 620 as provided in the above embodiment, and the antenna 620 is connected to the output end of the radio frequency circuit.

[0105] The present invention also provides an unmanned device, the unmanned device includes at least one WiFi module provided above, wherein the unmanned device may be a drone or an unmanned vehicle. The WiFi module and the unmanned device have the same technical features as the wireless communication circuit provided in the above embodiment, so they can also solve the same technical problems and achieve the same technical effects.

[0106] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0107] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wireless communication circuit, characterized in that: include: A main control chip circuit and a radio frequency front-end chip circuit, wherein the main control chip circuit and the radio frequency front-end chip circuit are connected via a radio frequency line; The main control chip circuit includes a main signal generating circuit and a signal fusion circuit, wherein the main signal generating circuit is used to output a communication signal to the signal fusion circuit; the signal fusion circuit is used to fuse the control signal and power signal of the communication signal obtained, and the communication signal to obtain a fusion signal, and output it to the RF front-end chip circuit through the RF line; wherein the power signal is used to provide a working voltage for a load on the RF front-end chip circuit side; The RF front-end chip circuit includes a RF circuit and a signal extraction circuit. The signal extraction circuit decouples the fused signal, extracts the control signal, the communication signal and the power signal, and outputs them to the RF circuit. The RF circuit sends out the communication signal under the control of the control signal.

2. The wireless communication circuit according to claim 1, characterized in that: The main control chip circuit and the radio frequency front-end chip circuit are arranged on the same or different circuit boards.

3. The wireless communication circuit according to claim 1, characterized in that: The signal fusion circuit comprises: A power circuit, used for generating a power signal; A first fusion circuit is used to fuse the obtained multiple control signals with different frequencies to obtain a fused control signal; The second fusion circuit, the input end of the second fusion circuit is connected to the output end of the first fusion circuit and the output end of the main signal generating circuit, and is used to fuse the fusion control signal, the communication signal and the power supply signal to obtain a fusion signal.

4. The wireless communication circuit according to claim 3, characterized in that: The first fusion circuit comprises: At least two active crystal oscillator circuits, each of which has a different operating frequency and is used to generate control signals of different frequencies; A first multiplexer, each input end of the first multiplexer is connected to an active crystal oscillator circuit, and the output end of the first multiplexer is connected to the second fusion circuit, and is used to couple and process multiple control signals of different frequencies to obtain a fused control signal.

5. The wireless communication circuit according to claim 4, characterized in that: The first fusion circuit also includes a switch circuit provided between each active crystal oscillator circuit and the input end of the first multiplexer, for controlling the corresponding active crystal oscillator circuit to be connected to or grounded with the input end of the first multiplexer based on an external input IO signal.

6. The wireless communication circuit according to claim 4, characterized in that: The second fusion circuit includes: The first duplexer has two input ends respectively connected to the output end of the first multiplexer and the output end of the main signal generating circuit, and is used to couple the fusion control signal and the communication signal, and fuse the coupled signal with the power supply signal to obtain a fusion signal.

7. The wireless communication circuit according to claim 6, characterized in that: The second fusion circuit further includes: an isolation circuit for isolating a DC signal in the communication signal and the coupled signal.

8. The wireless communication circuit according to claim 7, characterized in that: The isolation circuit comprises a first isolation branch and a second isolation branch; The first isolation branch is provided between the output end of the main signal generating circuit and the input end of the first duplexer, and is used to filter out the DC signal in the communication signal; The second isolation branch is arranged at the output end of the first duplexer and is used for filtering out a DC signal in the coupled signal.

9. The wireless communication circuit according to claim 8, characterized in that: The second isolation branch includes: a first capacitor provided between the output end of the first duplexer and the input end of the signal extraction circuit, used to isolate the DC signal in the coupled signal from flowing into the signal extraction circuit; a first inductor provided between the common end of the first capacitor and the signal extraction circuit and the output end of the power supply circuit, used to isolate the high-frequency signal in the coupled signal from flowing into the power supply; and / or, The first isolation branch includes a second capacitor disposed between an output end of the main signal generating circuit and an input end of the first duplexer.

10. The wireless communication circuit according to any one of claims 1 to 9, characterized in that: The signal extraction circuit comprises: a first separation circuit connected to the output end of the signal fusion circuit and used for separating a power signal from the fusion signal; a second separation circuit connected to the output end of the signal fusion circuit, used for separating a communication signal and a fusion control signal from the fusion signal, and outputting the communication signal to the radio frequency circuit; The third separation circuit is connected to the output end of the second separation circuit and is used to separate a plurality of control signals of different frequencies from the fused control signal.

11. The wireless communication circuit according to claim 10, characterized in that: The first separation circuit includes at least a second inductor, which is used to isolate the high-frequency signal in the fused signal to obtain a power supply signal.

12. The wireless communication circuit according to claim 10, characterized in that: The second separation circuit is a second duplexer, an input end of which is connected to the output end of the signal fusion circuit, one output end of which is connected to the radio frequency circuit, and the other output end of which is connected to the input end of the third separation circuit.

13. The wireless communication circuit according to claim 10, characterized in that: The signal extraction circuit also includes: A filtering and amplifying circuit is provided between the output end of the second separation circuit and the input end of the third separation circuit, and is used for filtering and amplifying the fusion control signal.

14. The wireless communication circuit according to claim 10, characterized in that: The signal extraction circuit also includes: The signal detection circuit is arranged at each output end of the third separation circuit, and is used to restore the control signal of the corresponding frequency from the fused control signal by using a voltage comparison method, and output it to the radio frequency circuit.

15. The wireless communication circuit according to claim 14, characterized in that: The third separation circuit is a second multiplexer, whose input end is connected to the output end of the second separation circuit, and each output end is provided with a signal detection circuit.

16. A WiFi module, characterized in that: It comprises a wireless communication circuit and an antenna as described in any one of claims 1 to 15, wherein the antenna is connected to the output end of the radio frequency circuit.

17. An unmanned device, characterized in that: The unmanned device comprises at least one WiFi module as claimed in claim 16.

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