CN116405066A

CN116405066A - Power supply communication multiplexing circuit and laser radar

Info

Publication number: CN116405066A
Application number: CN202310341920.9A
Authority: CN
Inventors: 谭轩文; 胡永生; 吴榜炽
Original assignee: Shenzhen Keyhole Technology Co ltd
Current assignee: Shenzhen Keyhole Technology Co ltd
Priority date: 2023-03-28
Filing date: 2023-03-28
Publication date: 2023-07-07
Anticipated expiration: 2043-03-28
Also published as: CN116405066B

Abstract

The invention discloses a power supply communication multiplexing circuit and a laser radar. The power supply communication multiplexing circuit comprises a first coupling coil, a second coupling coil, a power supply transmitting circuit, a power supply receiving circuit, a magnetic coupling modulation transmitting circuit and a magnetic coupling demodulation receiving circuit; the first coupling coil and the second coupling coil are coupled; the power supply transmitting circuit is connected with the first coupling coil, and the power supply receiving circuit is connected with the second coupling coil to form a wireless power supply circuit for transmitting low-frequency power supply signals; the magnetic coupling modulation transmitting circuit is connected with the second coupling coil, and the magnetic coupling demodulation receiving circuit is connected with the first coupling coil to form a wireless communication circuit for transmitting high-frequency modulation signals. By multiplexing the first coupling coil and the second coupling coil, signal distinction is performed according to the frequencies of the power supply signal and the modulation signal, so that the power supply signal can be transmitted, the high-frequency modulation signal can be transmitted, different signals with multiple frequencies can work independently, and the power supply and communication functions are guaranteed.

Description

Power supply communication multiplexing circuit and laser radar

Technical Field

The invention relates to the technical field of laser radars, in particular to a power supply communication multiplexing circuit and a laser radar.

Background

As shown in fig. 1, the existing lidar includes a stationary base and a rotating platform; the fixed base is provided with a driving motor which is connected with the rotary platform and used for driving the rotary platform to rotate; the rotary platform is provided with a laser ranging module for detecting the space distance. Because unable electric wire that links to each other between unable fixed base and the rotary platform, in order to realize power supply and the communication between fixed base and the rotary platform, current laser radar generally adopts coil coupling mode to supply power to carry out signal transmission through another photoelectric communication circuit.

As shown in fig. 1, the laser radar comprises a wireless power supply circuit and a wireless communication circuit; the wireless power supply circuit comprises a first coupling coil and a power supply transmitting circuit which are arranged on the fixed base, and a second coupling coil and a power supply receiving circuit which are arranged on the rotary platform; the power supply transmitting circuit is connected with the first coupling coil, the power supply receiving circuit is connected with the second coupling coil, and the first coupling coil is connected with the second coupling coil; the wireless communication circuit comprises a photoelectric modulation transmitting circuit and a photoelectric transmitting tube which are arranged on the rotary platform, and a photoelectric demodulation receiving circuit and a photoelectric receiving tube which are arranged on the fixed base; the photoelectric modulation transmitting circuit is connected with the photoelectric transmitting tube, the photoelectric demodulation receiving circuit is connected with the photoelectric receiving tube, and the photoelectric transmitting tube and the photoelectric receiving tube are oppositely arranged.

When the laser distance measuring device works, the power supply transmitting circuit on the fixed base is used for coupling electric energy into a second coupling coil through the first coupling coil in an alternating current mode, and the power supply receiving circuit is used for converting the alternating current into direct current for the rotary platform, in particular for a laser distance measuring module and other circuits arranged on the rotary platform; when the laser ranging module on the rotary platform works, the collected data signals are sent to the photoelectric modulation transmitting circuit; the electro-optical modulation transmitting circuit may feed a data signal (i.e., an alternating electrical signal) to the electro-optical transmitting tube; the photoelectric transmitting tube converts the data signal (namely alternating electric signal) into alternating optical signal and sends the alternating optical signal to the photoelectric receiving tube; the photoelectric receiving tube converts the alternating optical signal into an alternating electrical signal and outputs the alternating electrical signal to the photoelectric demodulation receiving circuit; the photoelectric demodulation receiving circuit converts the alternating electric signal into an original data signal so as to complete communication transmission of the data signal.

In the existing laser radar, a wireless power supply circuit and a wireless communication circuit are arranged separately, so that the circuit structure is complex, the occupied area is large, and the cost is high; moreover, the photoelectric transmitting tube and the photoelectric receiving tube are required to be arranged oppositely to realize communication, and the photoelectric transmitting tube and the photoelectric receiving tube are required to be placed in the central shaft of the driving motor, so that the driving motor with the central shaft of a hollow structure is required to be customized, and the cost is high.

Disclosure of Invention

The embodiment of the invention provides a power supply communication multiplexing circuit and a laser radar, which are used for solving the problems of complex structure, large area and high cost existing in the existing laser radar that a wireless power supply circuit and a wireless communication circuit are arranged separately.

A power supply communication multiplexing circuit comprises a first coupling coil, a second coupling coil, a power supply transmitting circuit, a power supply receiving circuit, a magnetic coupling modulation transmitting circuit and a magnetic coupling demodulation receiving circuit;

the first coupling coil and the second coupling coil are coupled;

the power supply transmitting circuit is connected with the first coupling coil, and the power supply receiving circuit is connected with the second coupling coil to form a wireless power supply circuit for transmitting low-frequency power supply signals;

the magnetic coupling modulation transmitting circuit is connected with the second coupling coil, and the magnetic coupling demodulation receiving circuit is connected with the first coupling coil to form a wireless communication circuit for transmitting high-frequency modulation signals.

Preferably, the magnetic coupling modulation transmitting circuit comprises a radio frequency modulation circuit and a first frequency selection filter circuit;

the radio frequency modulation circuit is connected with the modulation signal input end and the carrier signal input end and is used for modulating an original modulation signal input by the modulation signal input end and a high-frequency carrier signal input by the carrier signal input end and outputting a high-frequency modulation signal which is opposite to the original modulation signal in level and the same as the high-frequency carrier signal in frequency;

The first end of the first frequency-selecting filter circuit is connected with the radio frequency modulation circuit, and the second end of the first frequency-selecting filter circuit is connected with the second coupling coil and used for coupling the high-frequency modulation signal to the second coupling coil.

Preferably, the radio frequency modulation circuit comprises a first transistor and a second transistor;

the first end of the second transistor is connected with the modulating signal input end, the second end of the second transistor is connected with the digital ground, and the third end of the second transistor is connected with the first end of the first transistor and is used for controlling the on-off of the first transistor according to the original modulating signal input by the modulating signal input end;

the first end of the first transistor is connected with the carrier signal input end, the second end of the first transistor is connected with digital ground, and the third end of the first transistor is connected with the second coupling coil through the first frequency-selecting filter circuit and is used for outputting a high-frequency modulation signal which is opposite to the original modulation signal in level and has the same frequency as the high-frequency carrier signal according to the on-off state of the first transistor.

Preferably, the first frequency-selecting filter circuit includes a coupling capacitor, a first end of the coupling capacitor is connected with the radio frequency modulation circuit, a second end of the coupling capacitor is connected with the second coupling coil, and the coupling capacitor is matched with the second coupling coil, and is used for coupling the high-frequency modulation signal to the second coupling coil and blocking reverse transmission of the low-frequency power supply signal to the second coupling coil.

Preferably, the magnetic coupling modulation transmitting circuit further comprises a first resonant circuit, and the first resonant circuit comprises a first resonant capacitor and a second resonant capacitor;

the first end of the first resonant capacitor is connected with the second end of the first frequency-selecting filter circuit and the first end of the second coupling coil, and the second end of the first resonant capacitor is connected with the second end of the second coupling coil and digital ground;

the first end of the second resonance capacitor is connected with the second end of the first frequency selection filter circuit and the first end of the second coupling coil, and the second end of the second resonance capacitor is connected with the second end of the second coupling coil and digital ground.

Preferably, the magnetic coupling modulation transmitting circuit further comprises a power adjusting circuit;

the power adjusting circuit comprises an energy storage filter inductor, a first adjusting resistor and a second adjusting resistor;

the first end of the first adjusting resistor is connected with the power supply end, the second end of the first adjusting resistor is connected with the first end of the energy storage filter inductor, and the second end of the energy storage filter circuit is connected with the third end of the first transistor and the first end of the first frequency selection filter circuit;

The second adjusting resistor is arranged at two ends of the energy storage filter inductor in an associated mode.

Preferably, the magnetic coupling demodulation receiving circuit comprises a second frequency selection filter circuit and a signal demodulation circuit;

the second frequency-selecting filter circuit is connected with the first coupling coil and is used for performing frequency-selecting filtering on the low-frequency power supply signal and the high-frequency modulation signal received by the first coupling coil and outputting the filtered high-frequency modulation signal;

the signal demodulation circuit is connected with the second frequency selection filter circuit and is used for demodulating the filtered high-frequency modulation signal and outputting a demodulated original modulation signal.

Preferably, the signal demodulation circuit includes a level adjustment circuit and a detection diode;

one end of the level adjusting circuit is connected with the second frequency-selecting filter circuit, and the other end of the level adjusting circuit is connected with the detection diode and is used for adjusting the level of the high-frequency modulation signal output by the second frequency-selecting filter circuit;

the anode of the detection diode is connected with the level adjusting circuit, and the cathode of the detection diode is connected with the signal shaping circuit and is used for converting the high-frequency modulation signal after level adjustment into the original modulation signal after demodulation.

Preferably, the level adjustment circuit includes a first voltage dividing resistor and a second voltage dividing resistor;

the first voltage dividing resistor and the second voltage dividing resistor are arranged in parallel between the power supply end and the ground;

the output end of the second frequency-selecting filter circuit is connected with a node between the first voltage dividing resistor and the second voltage dividing resistor;

and the anode of the detection diode is connected with a node between the first voltage dividing resistor and the second voltage dividing resistor.

Preferably, the magnetic coupling demodulation receiving circuit further comprises a signal shaping circuit, wherein the signal shaping circuit comprises a voltage comparator, a reference voltage circuit, a current limiting resistor and a pull-up resistor;

the reference voltage circuit is used for providing a reference voltage signal;

the first input end of the voltage comparator is connected with the signal demodulation circuit, and the second input end of the voltage comparator is connected with the reference voltage circuit and is used for comparing the demodulated original modulation signal with the reference voltage signal in voltage and outputting a standard modulation signal;

the current limiting resistor is arranged between the output end of the voltage comparator and the modulation signal output end;

the first end of the pull-up resistor is connected with the power supply end, and the second end of the pull-up resistor is connected with the output end of the voltage comparator.

Preferably, the magnetic coupling demodulation receiving circuit further comprises a second resonant circuit, and the second resonant circuit is connected with the first coupling coil and the second frequency-selecting filter circuit, and is used for carrying out resonance processing on the signal received by the first coupling coil and outputting the high-frequency modulated signal after resonance to the second frequency-selecting filter circuit.

Preferably, the second resonant circuit includes a third resonant capacitor, a first end of the third resonant capacitor is connected to a node between the first end of the first coupling coil and the second frequency-selecting filter circuit, and a second end of the third resonant capacitor is connected to the second end of the first coupling coil and ground.

The laser radar comprises a fixed base and a rotary platform, wherein a driving motor is arranged on the fixed base and connected with the rotary platform for driving the rotary platform to rotate; the power supply communication multiplexing circuit is also included;

the first coupling coil, the power supply transmitting circuit and the magnetic coupling demodulation receiving circuit are arranged on the fixed base;

the second coupling coil, the power supply receiving circuit and the magnetic coupling modulation transmitting circuit are arranged on the rotating platform.

Above-mentioned power supply communication multiplexing circuit and laser radar, wireless power supply circuit and wireless communication multiplexing mutual coupling's first coupling coil and second coupling coil carry out the signal differentiation according to the frequency of power supply signal and modulating signal for two coupling coils both can transmit low frequency power supply signal, can transmit high frequency modulating signal again, make the different signals of multiple frequency mutually independent work, do not influence each other, guarantee power supply and communication function realization. In addition, the power supply communication multiplexing circuit is utilized to transmit the high-frequency modulation signal, so that the signal transmission efficiency can be improved, the application scene of the power supply communication multiplexing circuit can be improved, and the power supply communication multiplexing circuit can be applied to civil laser radars and industrial laser radars. Because the wireless power supply circuit and the wireless communication circuit multiplex the two coupling coils, the circuit structure of the whole power supply communication multiplexing circuit is simpler, the occupied area is smaller and the cost is lower. When this power supply communication multiplexing circuit is applied at laser radar, first coupling coil and second coupling coil intercoupling can realize the communication, need not to additionally assemble and aim at photoelectricity transmitting tube and the photoelectricity receiving tube that set up, also need not to customize driving motor's center pin, help reducing laser radar's cost, make its overall structure simpler.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments of the present invention will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a prior art lidar circuit;

FIG. 2 is a schematic diagram of a circuit of a lidar according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a magnetic coupling modulation transmitting circuit according to an embodiment of the present invention;

fig. 4 is a schematic circuit diagram of a magnetic coupling demodulation receiving circuit according to an embodiment of the invention.

In the figure: 11. a fixed base; 12. rotating the platform; 21. a first coupling coil; 22. a second coupling coil; 31. a power supply transmitting circuit; 32. a power supply receiving circuit; 41. a photoelectric modulation transmitting circuit; 42. a photoemission tube; 43. a photoelectric demodulation receiving circuit; 44. a photoelectric receiving tube; 5. a magnetic coupling modulation transmitting circuit; 51. a radio frequency modulation circuit; q51, first transistor; q52, second transistor; 52. a first resonant circuit; c521, a first resonance capacitor; c522, second resonance capacitance; 53. a first bias circuit; r531, the first bias resistor; 54. a second bias circuit; r541 is a second bias resistor; r542, third bias resistor; l541, first filter magnetic beads; 55. a power adjustment circuit; l551, energy storage filter inductance; r551, a first regulating resistor; r552, a second tuning resistor; 56. a tank filter circuit; l561, second filter magnetic beads; c561, first energy storage filter capacitor; c562, a second energy storage filter capacitor; 6. a magnetic coupling demodulation receiving circuit; a first frequency-selective filter circuit 57; c51, coupling capacitance; 61. a second frequency-selective filter circuit; c611, a first filter capacitor; 612, a second filter capacitor; l611, a first filter inductor; 62. a signal demodulation circuit; 621. a level adjustment circuit; r621, first voltage dividing resistor; r622, second shunt resistor; d621, a detector diode; 63. a signal shaping circuit; u631, voltage comparator; 631. a reference voltage circuit; r631, current limiting resistor; r632, pull-up resistor; r633, the third voltage dividing resistor; r634, fourth divider resistor; c631, an energy storage capacitor; 64. a first low-pass filter circuit; r641, a first filter resistor; c641, a third filter capacitor; 65. a second low pass filter circuit; r651, second filter resistor; r652, third filter resistor; a C651 and a fourth filter capacitor; 66. a second resonant circuit; and C661, a third resonance capacitor.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be understood that the present invention may be embodied in various 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, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the dimensions and relative dimensions of layers and regions may be exaggerated for the same elements throughout for clarity.

It will be understood that when an element or layer is referred to as being "on" …, "" adjacent to "…," "connected to" or "coupled to" another element or layer, it can be directly on, adjacent to, connected to or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on" …, "" directly adjacent to "…," "directly connected to" or "directly coupled to" another element or layer, there are no intervening elements or layers present. It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present invention.

Spatially relative terms, such as "under …," "under …," "below," "under …," "above …," "above," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use and operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "under" or "beneath" other elements would then be oriented "on" the other elements or features. Thus, the exemplary terms "under …" and "under …" may include both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of the associated listed items.

In the following description, for the purpose of providing a thorough understanding of the present invention, detailed structures and steps are presented in order to illustrate the technical solution presented by the present invention. Preferred embodiments of the present invention are described in detail below, however, the present invention may have other embodiments in addition to these detailed descriptions.

The embodiment of the invention provides a power supply communication multiplexing circuit, as shown in fig. 2, the power supply communication multiplexing circuit comprises a first coupling coil 21, a second coupling coil 22, a power supply transmitting circuit 31, a power supply receiving circuit 32, a magnetic coupling modulation transmitting circuit 5 and a magnetic coupling demodulation receiving circuit 6; the first coupling coil 21 and the second coupling coil 22 are coupled; the power supply transmitting circuit 31 is connected with the first coupling coil 21, and the power supply receiving circuit 32 is connected with the second coupling coil 22 to form a wireless power supply circuit for transmitting a low-frequency power supply signal; the magnetic coupling modulation transmitting circuit 5 is connected with the second coupling coil 22, and the magnetic coupling demodulation receiving circuit 6 is connected with the first coupling coil 21 to form a wireless communication circuit for transmitting high-frequency modulation signals.

Wherein the first coupling coil 21 and the second coupling coil 22 are two coils coupled to each other. As an example, when the power supply communication multiplexing circuit is applied to a laser radar, one of the first coupling coil 21 and the second coupling coil 22 is provided on the stationary base 11, and the other is provided on the rotary platform 12. In this example, for convenience of description, the coupling coil provided on the stationary base 11 is determined as a first coupling coil 21, and the coupling coil provided on the rotary table 12 is determined as a second coupling coil 22. Specifically, the first coupling coil 21 and the second coupling coil 22 are also circularly arranged, and the first coupling coil 21 provided on the fixed base 11 and the second coupling coil 22 provided on the rotary table 12 are oppositely arranged in parallel so that they are coupled to each other.

The low frequency power supply signal refers to a power supply signal with a lower frequency, for example, the low frequency power supply signal refers to a power supply signal with a frequency lower than a first frequency threshold. The first frequency threshold here is a threshold set in advance for evaluating whether the low frequency criterion is reached. Accordingly, the high frequency modulation signal refers to a modulation signal with a higher frequency, for example, the high frequency modulation signal is a power supply signal with a frequency higher than the second frequency threshold. The second frequency threshold here is a threshold set in advance for evaluating whether the high frequency standard is reached. The second frequency threshold value can be the same as the first frequency threshold value, and can also be different from the first frequency threshold value, and only the frequency difference between the low-frequency power supply signal and the high-frequency power supply signal is ensured to be large, so that confusion can not occur in the process of multiplexing the two coupling coils for signal transmission. As an example, when the power supply communication multiplexing circuit is applied to a laser radar, the high-frequency modulation signal is a digital signal with a higher frequency.

When the wireless power supply circuit works, the power supply transmitting circuit 31 couples the low-frequency power supply signal with electric energy in the form of alternating current to the second coupling coil 22 through the first coupling coil 21, and then the power supply receiving circuit 32 is adopted to convert the low-frequency power supply signal in the form of alternating current into the low-frequency power supply signal in the form of direct current, so that the low-frequency power supply signal can be output to the laser ranging module and other circuits arranged on the rotary platform 12 for use; when the wireless communication circuit works, the magnetic coupling modulation transmitting circuit 5 can receive the data signal output by the laser ranging module arranged on the rotary platform 12, convert the data signal into a high-frequency modulation signal, couple the high-frequency modulation signal to the first coupling coil 21 through the second coupling coil 22, and then the magnetic coupling demodulation receiving circuit 6 can convert the received high-frequency modulation signal into an original data signal so as to complete data signal transmission.

In this embodiment, the wireless power supply circuit and the wireless communication circuit multiplex the first coupling coil 21 and the second coupling coil 22 that are coupled to each other, and perform signal discrimination according to the frequencies of the power supply signal and the modulation signal, so that the two coupling coils can transmit both the low-frequency power supply signal and the high-frequency modulation signal, so that different signals with multiple frequencies work independently, do not affect each other, and ensure the realization of the power supply and the communication functions. In addition, the power supply communication multiplexing circuit is utilized to transmit the high-frequency modulation signal, so that the signal transmission efficiency can be improved, the application scene of the power supply communication multiplexing circuit can be improved, and the power supply communication multiplexing circuit can be applied to civil laser radars and industrial laser radars. Because the wireless power supply circuit and the wireless communication circuit multiplex the two coupling coils, the circuit structure of the whole power supply communication multiplexing circuit is simpler, the occupied area is smaller and the cost is lower. When the power supply communication multiplexing circuit is applied to a laser radar, the first coupling coil 21 and the second coupling coil 22 are mutually coupled to realize communication, the photoelectric transmitting tube 42 and the photoelectric receiving tube 44 which are arranged in an aligned mode are not required to be additionally assembled, the central shaft of the driving motor is not required to be customized, the cost of the laser radar is reduced, and the whole structure is simpler.

In one embodiment, as shown in fig. 3, the magnetic coupling modulation transmitting circuit 5 includes a radio frequency modulation circuit 51 and a first frequency selection filter circuit 57; the radio frequency modulation circuit 51 is connected to the modulation signal input end and the carrier signal input end, and is configured to modulate the original modulation signal TXD input by the modulation signal input end and the high-frequency carrier signal CLOCK input by the carrier signal input end, and output a high-frequency modulation signal opposite in level to the original modulation signal TXD and having the same frequency as the high-frequency carrier signal CLOCK; the first end of the first frequency-selecting filter circuit 57 is connected to the radio frequency modulation circuit 51, and the second end of the first frequency-selecting filter circuit 57 is connected to the second coupling coil 22, so as to couple the high-frequency modulation signal to the second coupling coil 22 and block the low-frequency power supply signal from being reversely transmitted to the second coupling coil 22.

The carrier signal input terminal is an input terminal for inputting a high-frequency carrier signal CLOCK. The high frequency carrier signal CLOCK here is a carrier signal of a fixed frequency.

The modulation signal input terminal is an input terminal for inputting the original modulation signal TXD. The original modulation signal TXD refers to a data signal to be modulated, and is a data signal not subjected to high-frequency modulation processing. The high frequency modulated signal refers to a data signal that has been modulated.

The radio frequency modulation circuit 51 is a circuit for realizing signal modulation.

The first frequency-selective filter circuit 57 is a circuit for filtering according to different frequencies. As an example, the first frequency selective filter circuit 57 may be one or a combination of at least two of a T-type high-pass filter circuit, an L-type high-pass filter circuit, an inverse L-type high-pass filter circuit, and a pi-type high-pass filter circuit.

As an example, the radio frequency modulation circuit 51 may receive the original modulation signal TXD input by the modulation signal input terminal and the high frequency carrier signal CLOCK input by the carrier signal input terminal, and modulate the original modulation signal TXD and the high frequency carrier signal CLOCK to output a high frequency modulation signal having the opposite level to the original modulation signal TXD and the same frequency as the high frequency carrier signal CLOCK. For example, when the original modulation signal TXD is high level (digital 1), the radio frequency modulation circuit 51 modulates it into a high frequency modulation signal of low level (data 0); when the original modulation signal TXD is low level (digital 0), the radio frequency modulation circuit 51 modulates the original modulation signal TXD into a high frequency modulation signal with high level (digital 1) and the same frequency as the high frequency carrier signal CLOCK, so that the frequency of the high frequency modulation signal is different from that of the low frequency power supply signal, and when the low frequency power supply signal and the high frequency modulation signal are coupled and transmitted through the two coupling coils, frequency selection processing can be performed according to different frequencies, so as to respectively identify the power supply signal and the modulation signal, and multiplexing of the power supply and communication functions is realized.

As an example, one end of the first frequency-selective filter circuit 57 is connected to the radio frequency modulation circuit 51, and the other end of the first frequency-selective filter circuit 57 is connected to the second coupling coil 22, for coupling the high-frequency modulation signal to the second coupling coil and blocking the low-frequency power supply signal from reversely transmitting to the second coupling coil 22. In this example, the first end of the first frequency-selecting filter circuit 57 is connected to the radio frequency modulation circuit 51 and the power supply receiving circuit 32, and the second end thereof is connected to the second coupling coil 22, and the first frequency-selecting filter circuit 57 can perform high-frequency filtering and low-frequency filtering operation on the high-frequency modulation signal and the low-frequency power supply signal to block and absorb the low-frequency power supply signal, and couple the filtered high-frequency modulation signal to the second coupling coil 22, so that the low-frequency power supply signal can be isolated, signal crosstalk can be prevented, and the circuit can be burned out when the high-frequency modulation signal is transmitted. In this example, the first frequency-selective filtering circuit 57 may perform resonance processing on the modulated high-frequency modulation signal to form a resonance phenomenon, and filter the low-frequency signal in the circuit, so that the modulated high-frequency modulation signal may be coupled to the first coupling coil 21 through the second coupling coil 22, so as to implement transmission of the modulation signal.

In one embodiment, as shown in fig. 3, the radio frequency modulation circuit 51 includes a first transistor Q51 and a second transistor Q52; the first end of the second transistor Q52 is connected with the modulating signal input end, the second end of the second transistor Q52 is connected with the digital ground DGND, the third end of the second transistor Q52 is connected with the first end of the first transistor Q51, and the first transistor Q51 is used for controlling the on-off state of the first transistor Q51 according to the original modulating signal TXD input by the modulating signal input end; the first end of the first transistor Q51 is connected to the carrier signal input end, the second end of the first transistor Q51 is connected to the digital ground DGND, and the third end of the first transistor Q51 is connected to the second coupling coil 22 through the first frequency-selecting filter circuit 57, so as to output a high-frequency modulation signal having the same frequency as the high-frequency carrier signal CLOCK and opposite to the original modulation signal TXD according to the on-off state of the first transistor Q51.

The first transistor Q51 and the second transistor Q52 are two transistors disposed in the radio frequency modulation circuit 51, specifically, power driving transistors. As an example, the first transistor Q51 and the second transistor Q52 may be NMOS transistors, first ends of the first transistor Q51 and the second transistor Q52 are gates of the NMOS transistors, second ends of the first transistor Q51 and the second transistor Q52 are sources of the NMOS transistors, and third ends of the first transistor Q51 and the second transistor Q52 are drains of the NMOS transistors.

As an example, a first terminal of the second transistor Q52 is connected to the modulation signal input terminal, a second terminal of the second transistor Q52 is connected to the digital ground DGND, and a third terminal of the second transistor Q52 is connected to the first terminal of the first transistor Q51; the first end of the first transistor Q51 is further connected to the carrier signal input end, the second end of the first transistor Q51 is connected to the digital ground DGND, and the third end of the first transistor Q51 is connected to the second coupling coil 22 through the first frequency-selecting filter circuit 57; when the original modulation signal TXD input at the modulation signal input end is at a high level (digital 1), the second transistor Q52 is turned on, and the gate of the first transistor Q51 is shorted to the ground, so that the first transistor Q51 is turned off, the high-frequency carrier signal CLOCK input at the carrier signal input end cannot be transmitted to the second coupling coil 22 through the first transistor Q51, and at this time, the second coupling coil 22 outputs a low-level high-frequency modulation signal; when the original modulation signal TXD input by the modulation signal input end is at a low level (digital 0), the second transistor Q52 is turned off, the first transistor Q51 is turned on, the high-frequency carrier signal CLOCK input by the carrier signal input end drives the first frequency-selecting filter circuit 57 to resonate through the first transistor Q51, and then the high-frequency carrier signal CLOCK after resonance is transmitted to the second coupling coil 22, and at this time, the second coupling coil 22 outputs a high-level high-frequency modulation signal; the high-frequency modulation signal here is a modulation signal having a relatively high frequency. In this example, according to the original modulation signal TXD, the on-off of the second transistor Q52 and the first transistor Q51 is controlled to determine whether the high-frequency carrier signal CLOCK resonates through the first transistor Q51 to drive the first frequency-selecting filter circuit 57, so as to form a high-frequency modulation signal opposite to the original modulation signal TXD and having the same frequency as the high-frequency carrier signal CLOCK, the second transistor Q52 mainly performs signal modulation, and the first transistor Q51 performs signal amplification to realize that the original modulation signal TXD is converted into a high-frequency modulation signal, so that the high-frequency modulation signal is different from a low-frequency power supply signal transmitted in the second coupling coil 22, so as to ensure that the power supply and the communication function do not interfere with each other, and the radio-frequency modulation circuit 51 formed by cooperation of the first transistor Q51 and the second transistor Q52 is adopted, so that the circuit structure is simpler.

In this embodiment, the first transistor Q51 and the second transistor Q52 are matched to form an ASK modulation circuit with a simpler structure and lower cost, and compared with the high-precision signal demodulation circuit 62 such as an FSK modulation circuit, a PSK modulation circuit, a QPSK modulation circuit, a QAM modulation circuit, and the like, the ASK modulation circuit can effectively save cost and reduce circuit complexity because the ASK modulation circuit does not need to be applied to an op-amp IC, a phase-locked loop IC, a digital filter IC, or even a dedicated modulation IC with higher cost.

In an embodiment, the first frequency-selective filtering circuit 57 includes a coupling capacitor C51, a first end of the coupling capacitor C51 is connected to the radio frequency modulation circuit 51, a second end of the coupling capacitor C51 is connected to the second coupling coil 22, and the coupling capacitor C51 and the second coupling coil 22 cooperate to couple the high frequency modulation signal to the second coupling coil 22 and block the reverse transmission of the low frequency power supply signal to the second coupling coil 22.

As an example, the first frequency-selecting filter circuit 57 includes a coupling capacitor C51, the coupling capacitor C51 is disposed between the radio frequency modulation circuit 51 and the second coupling coil 22, during the operation of the second coupling coil 22, an equivalent inductance is formed, and the equivalent inductance is matched with the coupling capacitor C51 to form an LC filter circuit, so that the high frequency modulation signal and the low frequency power supply signal can be passed through to filter the low frequency to block and absorb the low frequency power supply signal, and the filtered high frequency modulation signal is coupled to the second coupling coil 22, so that the low frequency power supply signal can be isolated when the high frequency modulation signal is transmitted, and the signal crosstalk is prevented, and the circuit is burnt. In this example, the filter circuit formed by the coupling capacitor C51 and the second coupling coil 22 in cooperation can perform resonance processing on the modulated high-frequency modulation signal to form a resonance phenomenon, and filter the low-frequency signal in the circuit, so that the modulated high-frequency modulation signal can be coupled to the first coupling coil 21 through the second coupling coil 22, and modulation signal transmission is realized. In addition, the first frequency-selecting filter circuit 57 formed by matching the coupling capacitor C51 and the second coupling coil 22 is adopted, and the existing second coupling coil 22 in the circuit is utilized, so that circuit components can be reduced, the cost is saved, the occupied area of the circuit is reduced, and the design requirements of miniaturization and integration can be met.

In an embodiment, as shown in fig. 3, the magnetic coupling modulation transmitting circuit 5 further includes a first resonant circuit 52, and the first resonant circuit 52 includes a first resonant capacitor C521 and a second resonant capacitor C522; a first end of the first resonance capacitor C521 is connected to the second end of the first frequency-selective filter circuit 57 and the first end of the second coupling coil 22, and a second end of the first resonance capacitor C521 is connected to the second end of the second coupling coil 22 and the digital ground DGND; a first end of the second resonance capacitor C522 is connected to the second end of the first frequency selective filter circuit 57 and the first end of the second coupling coil 22, and a second end of the second resonance capacitor C522 is connected to the second end of the second coupling coil 22 and the digital ground DGND.

The first resonant capacitor C521 and the second resonant capacitor C522 are two resonant capacitors in the first resonant circuit 52.

As an example, the first resonant circuit 52 may include a first resonant capacitor C521 and a second resonant capacitor C522 disposed in parallel with the second coupling coil 22, and the specific connection manner is as follows: a first end of the first resonance capacitor C521 is connected to the second end of the first frequency-selective filter circuit 57 and the first end of the second coupling coil 22, and a second end of the first resonance capacitor C521 is connected to the second end of the second coupling coil 22 and the digital ground DGND; a first end of the second resonance capacitor C522 is connected to the second end of the first frequency selective filter circuit 57 and the first end of the second coupling coil 22, and a second end of the second resonance capacitor C522 is connected to the second end of the second coupling coil 22 and the digital ground DGND. Understandably, the first resonant capacitor C521 and the second resonant capacitor C522 are connected in parallel to form a resonant circuit, so that signal adjustment can be performed when the waveform of the high-frequency modulation signal is bad, signal interference is avoided, and the first resonant capacitor C521 and the second resonant capacitor C522 are connected in parallel, so that the capacitance value of the first resonant circuit 52 can be conveniently adjusted to adapt to circuit requirements.

In an embodiment, as shown in fig. 3, the magnetic coupling modulation transmitting circuit 5 further includes a first bias circuit 53 and a second bias circuit 54; the first bias circuit 53 includes a first bias resistor R531; the first bias resistor R531 is disposed between the carrier signal input terminal and the first terminal of the first transistor Q51; the second bias circuit 54 includes a second bias resistor R541 and a third bias resistor R542; a second bias resistor R541 is disposed between the modulation signal input terminal and the first terminal of the second transistor Q52; a first end of the third bias resistor R542 is connected to a node between the second bias resistor R541 and the second transistor Q52, and a second end of the third bias resistor R542 is connected to the digital ground DGND.

As an example, the magnetically coupled modulated transmitting circuit 5 further comprises a first bias circuit 53, the first bias circuit 53 comprising a first bias resistor R531 arranged between the carrier signal input terminal and the first terminal of the first transistor Q51 for adjusting basic operating parameters of the first transistor Q51 to ensure that the first transistor Q51 operates in a suitable state.

As an example, the magnetically coupled modulated transmitting circuit 5 further comprises a second bias circuit 54, the second bias circuit 54 being arranged between the modulated signal input terminal and the first terminal of the second transistor Q52, and specifically comprising a second bias resistor R541 and a third bias resistor R542; a second bias resistor R541 is disposed between the modulation signal input terminal and the first terminal of the second transistor Q52; a first end of the third bias resistor R542 is connected to a node between the second bias resistor R541 and the second transistor Q52, and a second end of the third bias resistor R542 is connected to the digital ground DGND. In this example, the second bias circuit 54 formed by the second bias resistor R541 and the third bias resistor R542 can adjust the basic operating parameters of the second transistor Q52 to ensure that the second transistor Q52 operates in a proper state.

In an embodiment, as shown in fig. 3, the magnetic coupling modulation transmitting circuit 5 further includes a first filter magnetic bead L541, a first end of the first filter magnetic bead L541 is connected to a node between the third bias resistor R542 and the digital ground DGND, and a second end of the second filter magnetic bead L561 is connected to the ground GND.

As an example, the magnetic coupling modulation transmitting circuit 5 further includes a first filtering magnetic bead L541 for filtering the clutter signal in the circuit, where a first end of the first filtering magnetic bead L541 is connected to a node between the third bias resistor R542 and the digital ground DGND, and a second end of the first filtering magnetic bead L541 is connected to the ground GND for preventing the current level modulation signal (i.e. the original modulation signal TXD) from cross-talk from the ground GND to other circuits, and affecting the normal operation of the other circuits.

In one embodiment, as shown in fig. 3, the magnetic coupling modulation transmitting circuit 5 further includes a power adjustment circuit 55; the power adjusting circuit 55 comprises an energy storage filter inductor L551, a first adjusting resistor R551 and a second adjusting resistor R552; a first end of the first adjusting resistor R551 is connected to the power supply end VCC (+5v), a second end of the first adjusting resistor R551 is connected to a first end of the energy storage filter inductor L551, and a second end of the energy storage filter inductor L551 is connected to a third end of the first transistor Q51 and a first end of the first frequency selection filter circuit 57; the second adjusting resistor R552 is disposed at two ends of the energy storage filter inductor L551 in association.

The power adjustment circuit 55 is a circuit for realizing power adjustment.

As an example, the power adjustment circuit 55 includes a tank filter inductance L551, a first adjustment resistor R551, and a second adjustment resistor R552. The first adjusting resistor R551 and the energy storage filter inductor L551 are arranged in series between the power supply end VCC (+5V) and the third end of the first transistor Q51, namely, the first end of the first adjusting resistor R551 is connected with the power supply end VCC (+5V), the second end of the first adjusting resistor R551 is connected with the first end of the energy storage filter inductor L551, and the second end of the energy storage filter inductor L551 is connected with the third end of the first transistor Q51 and the first end of the first frequency selection filter circuit 57; the current magnitude between the power supply end VCC (+5V) and the third end of the first transistor Q51 is regulated by adopting a first regulating resistor R551 so as to regulate the power of the wireless signal; the energy storage filter inductor L551 is disposed between the power supply terminal VCC (+5v) and the third terminal of the first transistor Q51, and is used for implementing energy storage and filtering, so as to ensure that the signal output by the first transistor Q51 has enough energy to radiate, and avoid the signal from being fed back to the power supply circuit connected to the power supply terminal VCC (+5v), thereby interfering with other circuits. The second adjusting resistor R552 is arranged at two ends of the energy storage filter inductor L551 in parallel, namely one end of the second adjusting resistor R552 is connected with a node between the first adjusting resistor R551 and the energy storage filter inductor L551, and the other end of the second adjusting resistor R552 is connected with a node between the energy storage filter inductor L551 and the first transistor Q51 and used for adjusting the Q value of the energy storage filter inductor L551 so as to adjust the power of a wireless signal.

In one embodiment, as shown in fig. 3, the magnetic coupling modulation transmitting circuit 5 further includes a tank filter circuit 56; one end of the tank filter circuit 56 is connected to the power supply terminal VCC (+5v), and a second end of the tank filter circuit 56 is connected to the power adjustment circuit 55.

The tank filter circuit 56 is a circuit for realizing the tank and filter functions.

As an example, the magnetically coupled modulated transmitting circuit 5 further includes a tank filter circuit 56, where one end of the tank filter circuit 56 is connected to the power supply terminal VCC (+5v), and a second end of the tank filter circuit 56 is connected to the power adjustment circuit 55, so as to filter out spurious signals in the circuit, avoid crosstalk to the power supply circuit connected to the power supply terminal VCC (+5v), affect other circuits, and ensure electrical energy stability of the power supply circuit.

In one embodiment, as shown in fig. 3, the tank filter circuit 56 includes a second filter magnetic bead L561, a first tank filter capacitor C561, and a second tank filter capacitor C562; the first end of the second filtering magnetic bead L561 is connected with the power supply end VCC (+5V), and the second end of the second filtering magnetic bead L561 is connected with the power adjusting circuit 55; the first end of the first energy storage filter capacitor C561 is connected with the first end of the second filter magnetic bead L561, and the second end of the first energy storage filter capacitor C561 is connected with the ground GND; the first end of the second energy storage filter capacitor C562 is connected to the second end of the second filter magnetic bead L561, and the second end of the second energy storage filter capacitor C562 is connected to the digital ground DGND.

As an example, the tank filter circuit 56 includes a second tank filter capacitor C562 for filtering clutter signals in the circuit, and first and second tank filter capacitors C561 and C562 for implementing tank and filter functions. The first end of the second filtering magnetic bead L561 is connected with the power supply end VCC (+5V), and the second end of the second filtering magnetic bead L561 is connected with the power adjusting circuit 55 and is used for filtering clutter signals between the power supply end VCC (+5V) and the power adjusting circuit 55, so that the clutter signals are prevented from being crossly connected to the power supply circuit, and normal operation of other circuits is affected. The first end of the first energy storage filter capacitor C561 is connected with a node between the first end of the second filter magnetic bead L561 and the power supply end VCC (+5V), and the second end of the first energy storage filter capacitor C561 is connected with the ground GND; a first end of the second energy storage filter capacitor C562 is connected with a node between a second end of the second filter magnetic bead L561 and the power adjusting circuit 55, and a second end of the second energy storage filter capacitor C562 is connected with the digital ground DGND; the first energy storage filter capacitor C561 is matched with the second energy storage filter capacitor C562, so that continuous and stable electric energy output by the circuit can be guaranteed, clutter signals of the circuit can be filtered, and other circuits are prevented from being interfered.

In one embodiment, as shown in fig. 4, the magnetic coupling demodulation receiving circuit 6 includes a second frequency-selective filtering circuit 61 and a signal demodulating circuit 62; the second frequency-selecting filter circuit 61 is connected to the first coupling coil 21, and is configured to perform frequency-selecting filtering on the low-frequency power supply signal and the high-frequency modulation signal received by the first coupling coil 21, and output a filtered high-frequency modulation signal; the signal demodulation circuit 62 is connected to the second frequency-selective filtering circuit 61, and is configured to perform signal demodulation on the filtered high-frequency modulated signal, and output a demodulated original modulated signal TXD.

The second frequency-selective filter circuit 61 is a circuit for filtering according to different frequencies. The signal demodulation circuit 62 is a circuit for realizing signal demodulation, and is a circuit having a function opposite to that of the radio frequency modulation circuit 51. The signal shaping circuit 63 is a circuit for realizing signal shaping.

As an example, the second frequency-selecting filter circuit 61 is connected to the first coupling coil 21, and can receive the low-frequency power supply signal and the high-frequency modulation signal coupled by the second coupling coil 22 through the first coupling coil 21, perform a high-frequency filtering low-frequency operation on the low-frequency power supply signal and the high-frequency modulation signal to block and absorb the low-frequency power supply signal, and output the filtered high-frequency modulation signal. In this example, the second frequency-selective filtering circuit 61 may distinguish the low-frequency power supply signal and the high-frequency carrier signal according to different frequencies, so that the two signals are transmitted independently and do not interfere with each other. In the photoelectric communication process of the photoelectric modulation transmitting circuit 41 and the photoelectric demodulation receiving circuit 43, there is no interference signal, in this example, the first coupling coil 21 may transmit a power supply signal and receive a high-frequency modulation signal, and there is signal interference, so the second frequency selection filter circuit 61 needs to be provided for filtering, and the strong magnetic signal is isolated.

As an example, the signal demodulation circuit 62 is connected to the second frequency-selective filtering circuit 61, and is configured to perform signal demodulation on the filtered high-frequency modulated signal output by the second frequency-selective filtering circuit 61, so as to output a demodulated original modulated signal TXD. For example, when the original modulation signal TXD is at a high level (digital 1), the rf modulation circuit 51 modulates it into a high frequency modulation signal at a low level (data 0), and the signal demodulation circuit 62 performs level conversion on the filtered high frequency modulation signal to output the original modulation signal TXD at a high level (data 1); conversely, when the original modulation signal TXD is at a low level (digital 0), the rf modulation circuit 51 modulates it into a high-frequency modulation signal having the same frequency as the CLOCK signal of the high-frequency carrier signal, and the signal demodulation circuit 62 performs level conversion on the filtered high-frequency modulation signal to output the original modulation signal TXD at a low level (digital 0).

In this embodiment, since the first coupling coil 21 is connected to both the power supply transmitting circuit 31 and the magnetic coupling demodulation receiving circuit 6, so that the first coupling coil 21 is coupled to the second coupling coil 22, not only a low-frequency power supply signal but also a high-frequency modulation signal can be transmitted, so that the signal in the first coupling coil 21 may be the low-frequency power supply signal or the high-frequency modulation signal, and the second frequency selection filter circuit 61 connected to the first coupling coil 21 is required to block and absorb the low-frequency power supply signal and output the filtered high-frequency modulation signal; since the high-frequency modulation signal is opposite in level to the original modulation signal TXD and has the same frequency as the high-frequency carrier signal CLOCK, the high-frequency modulation signal needs to be signal-demodulated to output the demodulated original modulation signal TXD.

In an embodiment, the second frequency selective filter circuit 61 includes one or a combination of at least two of a T-type high-pass filter circuit, an L-type high-pass filter circuit, an inverse L-type high-pass filter circuit, and a pi-type high-pass filter circuit.

As an example, the second frequency-selective filter circuit 61 may be a T-type high-pass filter circuit, where the T-type high-pass filter circuit is a circuit that is configured in a T-type manner and is configured by adopting elements such as a resistor, an inductor, and a capacitor to filter low frequencies, and has the characteristics of low load impedance, low source impedance, and the like.

As an example, the second frequency-selective filter circuit 61 may be an L-shaped high-pass filter circuit, which is a circuit for implementing low-frequency filtering of high-frequency and low-frequency by adopting elements such as a resistor, an inductor, a capacitor, and the like to cooperate, and has the characteristics of high load impedance, low source impedance, and the like.

As an example, the second frequency-selective filter circuit 61 may be an inverse L-shaped high-pass filter circuit, where the inverse L-shaped high-pass filter circuit is a circuit for implementing high-frequency and low-frequency filtering, and has the characteristics of low load impedance, high source impedance, and the like, and is configured by adopting elements such as a resistor, an inductor, and a capacitor to cooperate with each other.

As an example, the second frequency-selective filter circuit 61 may be a pi-type high-pass filter circuit, where the pi-type high-pass filter circuit is a circuit for implementing high-frequency and low-frequency filtering, and the pi-type high-pass filter circuit is configured by adopting elements such as a resistor, an inductor, a capacitor, and the like, and has the characteristics of high load impedance, high source impedance, and the like.

As an example, the second frequency-selective filter circuit 61 may be a circuit formed by combining at least two of a T-type high-pass filter circuit, an L-type high-pass filter circuit, an inverse L-type high-pass filter circuit and a n-type high-pass filter circuit, and the corresponding characteristics thereof may be determined according to the combined circuit.

In this embodiment, according to the actual circuit requirement, one or a combination of at least two of the T-type high-pass filter circuit, the L-type high-pass filter circuit, the inverse L-type high-pass filter circuit and the n-type high-pass filter circuit may be selected independently to form the second frequency-selecting filter circuit 61, so that the low-frequency power supply signal with the carrier frequency of 100-300 KHz and the high-frequency modulation signal with the carrier frequency of several MHz to tens MHz may be completely separated, so that the two signals are transmitted independently and do not interfere with each other; in addition, as the carrier frequency of the high-frequency modulation signal is higher, the transmission efficiency of the high-frequency carrier signal CLOCK can be protected, and the system performance is greatly improved.

In one embodiment, as shown in fig. 4, the T-type high-pass filter circuit includes a first filter capacitor C611, a second filter capacitor C612, and a first filter inductor L611; the first filter capacitor C611 and the second filter capacitor C612 are arranged in series between the first coupling coil 21 and the signal demodulation circuit 62; one end of the first filter inductor L611 is connected to a node between the first filter capacitor C611 and the second filter capacitor C612, and the other end of the first filter inductor L611 is grounded.

As an example, the T-type high-pass filter circuit includes a first filter capacitor C611, a second filter capacitor C612 and a first filter inductor L611, where the first filter capacitor C611 and the second filter capacitor C612 are serially connected between the first coupling coil 21 and the signal demodulation circuit 62, and the first filter inductor L611 is disposed between the two filter capacitors and the ground, and the three are in a T-type design.

In one embodiment, as shown in fig. 4, the signal demodulation circuit 62 includes a level adjustment circuit 621 and a detection diode D621; one end of the level adjustment circuit 621 is connected to the second frequency selection filter circuit 61, and the other end of the level adjustment circuit 621 is connected to the detector diode D621, for adjusting the level of the high-frequency modulation signal output from the second frequency selection filter circuit 61; the anode of the detector diode D621 is connected to the level adjustment circuit 621, and the cathode of the detector diode D621 is connected to the signal shaping circuit 63 for converting the level-adjusted high-frequency modulated signal into a demodulated original modulated signal TXD.

The level adjustment circuit 621 is a circuit for realizing a level adjustment function. For example, the level adjustment circuit 621 may be a reference power supply circuit and a level conversion circuit which can realize level adjustment as long as it can realize a level adjustment function.

As an example, one end of the level adjustment circuit 621 is connected to the second frequency selection filter circuit 61, and the other end of the level adjustment circuit 621 is connected to the detection diode D621, for adjusting the level of the high-frequency modulation signal outputted from the second frequency selection filter circuit 61 to raise the level of the useful signal to a level that can pass through the detection diode D621, so as to ensure that the signal after the level adjustment can be transmitted to the subsequent circuit through the detection diode D621. For example, when the original modulation signal TXD is at a high level (digital 1), the rf modulation circuit 51 modulates it into a high frequency modulation signal at a low level (data 0), and the level adjustment circuit 621 level-converts the filtered high frequency modulation signal to output the original modulation signal TXD at a high level (data 1) so that the original modulation signal TXD at a high level can pass through the detection diode D621; conversely, when the original modulation signal TXD is at a low level (digital 0), the rf modulation circuit 51 modulates the original modulation signal TXD to a high-frequency modulation signal having the same frequency as the CLOCK signal of the high-frequency carrier signal, and the level adjustment circuit 621 level-converts the filtered high-frequency modulation signal to output the original modulation signal TXD at a low level (digital 0) such that the original modulation signal TXD at the low level cannot pass through the detector diode D621.

As an example, the anode of the detection diode D621 is connected to the level adjustment circuit 621, and the cathode of the detection diode D621 is connected to the signal shaping circuit 63, so that the level-adjusted high-frequency modulation signal can be converted into the demodulated original modulation signal TXD, specifically, the adjusted high-level original modulation signal TXD can pass through the detection diode D621, so that the detection diode D621 can output the demodulated original modulation signal TXD, thereby achieving the signal demodulation purpose.

In one embodiment, as shown in fig. 4, the level adjustment circuit 621 includes a first voltage dividing resistor R621 and a second voltage dividing resistor R622; the first voltage dividing resistor R621 and the second voltage dividing resistor R622 are arranged in parallel between the power supply end VCC (+5V) and the ground; the output end of the second frequency-selecting filter circuit 61 is connected with a node between the first divider resistor R621 and the second divider resistor R622; the anode of the detector diode D621 is connected to a node between the first divider resistor R621 and the second divider resistor R622.

As an example, the level adjustment circuit 621 includes a first voltage dividing resistor R621 and a second voltage dividing resistor R622 that are arranged in series, and a node between the first voltage dividing resistor R621 and the second voltage dividing resistor R622 is connected to an output end of the second frequency selection filter circuit 61 and an anode of the detector diode D621, and the level adjustment is implemented by using two voltage dividing resistors, which has a simpler circuit structure and lower cost.

In an embodiment, as shown in fig. 4, the magnetic coupling demodulation receiving circuit 6 further includes a first low-pass filter circuit 64; one end of the first low-pass filter circuit 64 is connected to the power line interface VBUS, and the other end of the first low-pass filter circuit 64 is connected to the signal demodulation circuit 62.

The power line interface VBUS is an interface for connecting with a power line.

As an example, since the power line interface VBUS is shared with the power supply transmitting circuit 31 and the power supply terminal VCC (+5v) of the driving motor, and the power supply transmitting circuit 31 and the power supply terminal VCC of the driving motor are relatively high, there is a probability that the carrier signals thereof will be reversely cross-linked, and the first low-pass filter circuit 64 needs to be disposed between the power line interface VBUS and the signal demodulation circuit 62 to filter the interference signals in the circuit, so as to avoid the operation of the interference signal demodulation circuit 62.

In one embodiment, as shown in fig. 4, the first low-pass filter circuit 64 includes a first filter resistor R641 and a third filter capacitor C641; one end of the first filter resistor R641 is connected with the power line interface VBUS, and the other end of the first filter resistor R641 is connected with the signal demodulation circuit 62; one end of the third filter capacitor C641 is connected to a node between the first filter resistor R641 and the signal demodulation circuit 62, and the third filter capacitor C641 is grounded.

As an example, the first low-pass filter circuit 64 may include a first filter resistor R641 and a third filter capacitor C641, where the first filter resistor R641 is disposed between the power line interface VBUS and the signal demodulation circuit 62, and one end of the third filter capacitor C641 is grounded at a node between the first filter resistor R641 and the signal demodulation circuit 62, so that the first filter resistor R641 and the third filter capacitor C641 cooperate to form an L-shaped low-pass filter circuit, which can effectively filter interference signals of the circuit, avoid interference signals formed by the power supply transmitting circuit 31 and the driving motor, and cause interference to the signal demodulation circuit 62.

In an embodiment, as shown in fig. 4, the magnetic coupling demodulation receiving circuit 6 further includes a signal shaping circuit 63, where the signal shaping circuit 63 includes a voltage comparator U631, a reference voltage circuit 631, a current limiting resistor R631, and a pull-up resistor R632; a reference voltage circuit 631 for providing a reference voltage signal; the first input end-IN of the voltage comparator U631 is connected to the signal demodulation circuit 62, and the second input end +in of the voltage comparator U631 is connected to the reference voltage circuit 631, for performing voltage comparison on the demodulated original modulation signal TXD and the reference voltage signal, and outputting a standard modulation signal; the current limiting resistor R631 is arranged between the output end of the voltage comparator U631 and the modulation signal output end; the first terminal of the pull-up resistor R632 is connected to the power supply terminal VCC (+5v), and the second terminal of the pull-up resistor R632 is connected to the output terminal of the voltage comparator U631.

As an example, the magnetic coupling demodulation receiving circuit 6 further includes a signal shaping circuit 63, where the signal shaping circuit 63 is connected to the signal demodulation circuit 62, and is capable of performing waveform shaping on the demodulated original modulation signal TXD, and restoring it to a standard TTL data stream, that is, the original modulation signal, so as to send the original modulation signal to a post-stage circuit for processing.

The voltage comparator U631 is a device for performing voltage comparison. The reference voltage circuit 631 is a circuit for supplying a reference voltage. The current limiting resistor R631 is a resistor for realizing current limiting protection.

As an example, two input terminals of the voltage comparator U631 are respectively connected to the signal demodulation circuit 62 and the reference voltage circuit 631, and the demodulated original modulation signal TXD and the reference voltage signal are subjected to voltage comparison, and when the demodulated original modulation signal TXD is greater than the reference voltage signal, a low-level standard modulation signal is output; when the demodulated original modulation signal TXD is not greater than the reference voltage signal, a standard modulation signal of a high level is output to realize the shaping of the analog signal into a standard digital level signal (i.e., standard modulation signal).

As an example, in order to ensure the safety of the signal shaping circuit 63, to avoid the burnout of the signal shaping circuit 63 when the post-stage circuit connected to the output terminal of the voltage comparator U631 is shorted to the ground, a current limiting resistor R631 needs to be disposed at the output terminal of the voltage comparator U631.

As an example, the signal shaping circuit 63 further includes a pull-up resistor R632, and the pull-up resistor R632 is configured to provide a high level to the output standard modulation signal. In this example, when the internal structure of the output end of the voltage comparator U631 is an open drain output end, a pull-up resistor R632 needs to be externally connected to the output end of the voltage comparator U631 to ensure that it can output a high level signal.

In one embodiment, as shown in fig. 4, the reference voltage circuit 631 includes a third voltage dividing resistor R633, a fourth voltage dividing resistor R634, and a storage capacitor C631; the first end of the third voltage dividing resistor R633 is connected with the power supply end VCC (+5V), and the second end of the third voltage dividing resistor R633 is connected with the second input end +IN of the voltage comparator U631; the first end of the fourth voltage dividing resistor R634 is connected with a node between the third voltage dividing resistor R633 and the second input end +IN of the voltage comparator U631, and the second end of the fourth voltage dividing resistor R634 is grounded; the first end of the energy storage capacitor C631 is connected to a node between the third voltage dividing resistor R633 and the second input terminal +in of the voltage comparator U631, and the second end of the energy storage capacitor C631 is grounded.

As an example, the reference voltage circuit 631 includes a third voltage dividing resistor R633, a fourth voltage dividing resistor R634, and a storage capacitor C631; the third voltage dividing resistor R633 is provided between the power supply terminal VCC (+5v) and the voltage comparator U631; one end of the fourth voltage dividing resistor R634 is connected to a node between the third voltage dividing resistor R633 and the voltage comparator U631, and the other end is grounded, so that the third voltage dividing resistor R633 and the fourth voltage dividing resistor R634 divide an input signal of the power supply terminal VCC (+5v) to output a reference voltage signal; one end of the energy storage capacitor C631 is connected with a node between the third voltage dividing resistor R633 and the voltage comparator U631, and the other end of the energy storage capacitor C is grounded and used for realizing energy storage filtering effect and guaranteeing the stability of the provided reference voltage signal.

In an embodiment, as shown in fig. 4, the magnetic coupling demodulation receiving circuit 6 further includes a second low-pass filter circuit 65; one end of the second low-pass filter circuit 65 is connected to the signal demodulation circuit 62, and the other end of the second low-pass filter circuit 65 is connected to the signal shaping circuit 63.

As an example, since the high-frequency carrier signal CLOCK still remains in the demodulated original modulated signal TXD output by the signal demodulation circuit 62, in order to avoid the interference of the remaining high-frequency carrier signal CLOCK to the post-stage signal shaping circuit 63, a second low-pass filter circuit 65 is disposed between the signal demodulation circuit 62 and the signal shaping circuit 63, and the second low-pass filter circuit 65 is used to pass the low-frequency impedance high frequency, so as to ensure the circuit performance.

In one embodiment, as shown in fig. 4, the second low-pass filter circuit 65 includes a second filter resistor R651, a third filter resistor R652, and a fourth filter capacitor C651; one end of the second filter resistor R651 is connected with the signal demodulation circuit 62, and the other end of the second filter resistor R651 is connected with the signal shaping circuit 63; one end of the third filter resistor R652 is connected with a node between the second filter resistor R651 and the signal shaping circuit 63, and the other end of the third filter resistor R652 is grounded; one end of the fourth filter capacitor C651 is connected to a node between the second filter resistor R651 and the signal shaping circuit 63, and the other end of the fourth filter capacitor C651 is grounded.

As an example, the second low-pass filter circuit 65 includes a second filter resistor R651, a third filter resistor R652, and a fourth filter capacitor C651; the second filter resistor R651 is provided between the signal demodulation circuit 62 and the signal shaping circuit 63; one end of the third filter resistor R652 is connected with a node between the second filter resistor R651 and the signal shaping circuit 63, and the other end of the third filter resistor R652 is grounded; one end of the fourth filter capacitor C651 is connected with a node between the second filter resistor R651 and the signal shaping circuit 63, and the other end of the fourth filter capacitor C651 is grounded, so that the formed low-pass filter circuit has the advantages of good filter characteristic, simplicity in circuit, easiness in adjustment and low cost.

In an embodiment, the magnetic coupling demodulation receiving circuit 6 further includes a second resonant circuit 66, where the second resonant circuit 66 is connected to the first coupling coil 21 and the second frequency-selecting filter circuit 61, and is configured to perform resonance processing on a signal received by the first coupling coil 21, and output a high-frequency modulated signal after resonance to the second frequency-selecting filter circuit 61.

As an example, the magnetic coupling demodulation receiving circuit 6 further includes a second resonant circuit 66, where the second resonant circuit 66 is disposed between the first coupling coil 21 and the second frequency-selecting filter circuit 61, and can perform resonance processing on the signal received by the first coupling coil 21 to filter out the low-frequency power supply signal, screen out the high-frequency modulated signal after resonance, and transmit the high-frequency modulated signal to the second frequency-selecting filter circuit 61, so as to perform demodulation operation subsequently, to avoid interference of the low-frequency power supply signal.

In an embodiment, the second resonant circuit 66 includes a third resonant capacitor C661, a first end of the third resonant capacitor C661 is connected to a node between the first end of the first coupling coil 21 and the second frequency-selective filter circuit 61, and a second end of the third resonant capacitor C661 is connected to the second end of the first coupling coil 21 and ground.

As an example, two ends of the third resonant capacitor C661 are connected in parallel with the first coupling coil 21, that is, a first end of the third resonant capacitor C661 is connected to a node between the first end of the first coupling coil 21 and the second frequency-selecting filter circuit 61, and a second end of the third resonant capacitor C661 is connected to a second end of the first coupling coil 21 and ground, so that the third resonant capacitor C661 is connected in parallel with the first coupling coil 21 to form a resonant circuit, and the first coupling coil 21 for realizing magnetic coupling is further utilized, so that the circuit structure is simpler, the occupied area is smaller, and the cost is lower.

The embodiment of the invention provides a laser radar, which comprises a fixed base 11 and a rotary platform 12, wherein a driving motor is arranged on the fixed base 11 and is connected with the rotary platform 12 and used for driving the rotary platform 12 to rotate; the power supply communication multiplexing circuit is also included; the first coupling coil 21, the power supply transmitting circuit 31 and the magnetic coupling demodulation receiving circuit 6 are arranged on the fixed base 11; the second coupling coil 22, the power supply receiving circuit 32, and the magnetic coupling modulation transmitting circuit 5 are provided on the rotary table 12.

As an example, the laser radar includes a fixed base 11 and a rotary platform 12, a driving motor for driving the rotary platform 12 to work is provided on the fixed base 11, and a first coupling coil 21, a power supply transmitting circuit 31 and a magnetic coupling demodulation receiving circuit 6 are provided on the fixed base 11; the second coupling coil 22, the power supply receiving circuit 32, and the magnetic coupling modulation transmitting circuit 5 are provided on the rotary table 12. When the wireless power supply circuit works, the power supply transmitting circuit 31 couples the low-frequency power supply signal with electric energy in the form of alternating current to the second coupling coil 22 through the first coupling coil 21, and then the power supply receiving circuit 32 is adopted to convert the low-frequency power supply signal in the form of alternating current into the low-frequency power supply signal in the form of direct current, so that the low-frequency power supply signal can be output to the laser ranging module and other circuits arranged on the rotary platform 12 for use; when the wireless communication circuit works, the magnetic coupling modulation transmitting circuit 5 can receive the data signal output by the laser ranging module arranged on the rotary platform 12, convert the data signal into a high-frequency modulation signal, couple the high-frequency modulation signal to the first coupling coil 21 through the second coupling coil 22, and then the magnetic coupling demodulation receiving circuit 6 can convert the received high-frequency modulation signal into an original data signal so as to complete data signal transmission.

In this embodiment, the wireless power supply circuit and the wireless communication circuit multiplex the first coupling coil 21 and the second coupling coil 22 that are coupled to each other, and perform signal discrimination according to the frequencies of the power supply signal and the modulation signal, so that the two coupling coils can transmit both the low-frequency power supply signal and the high-frequency modulation signal, so that different signals with multiple frequencies work independently, do not affect each other, and ensure the realization of the power supply and the communication functions. In addition, the power supply communication multiplexing circuit is utilized to transmit the high-frequency modulation signal, so that the signal transmission efficiency can be improved, the application scene of the power supply communication multiplexing circuit can be improved, and the power supply communication multiplexing circuit can be applied to civil laser radars and industrial laser radars. Because the wireless power supply circuit and the wireless communication circuit multiplex the two coupling coils, the circuit structure of the whole power supply communication multiplexing circuit is simpler, the occupied area is smaller and the cost is lower. Because the first coupling coil 21 and the second coupling coil 22 are mutually coupled, communication can be realized, the photoelectric transmitting tube 42 and the photoelectric receiving tube 44 which are arranged in an aligned manner do not need to be additionally assembled, the central shaft of the driving motor does not need to be customized, the cost of the laser radar is reduced, and the whole structure is simpler.

The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.

Claims

1. The power supply communication multiplexing circuit is characterized by comprising a first coupling coil, a second coupling coil, a power supply transmitting circuit, a power supply receiving circuit, a magnetic coupling modulation transmitting circuit and a magnetic coupling demodulation receiving circuit;

the first coupling coil and the second coupling coil are coupled;

2. The powered communications multiplexing circuit of claim 1 wherein the magnetically coupled modulated transmitting circuit comprises a radio frequency modulation circuit and a first frequency selective filter circuit;

the first end of the first frequency-selecting filter circuit is connected with the radio frequency modulation circuit, and the second end of the first frequency-selecting filter circuit is connected with the second coupling coil and used for coupling the high-frequency modulation signal to the second coupling coil and blocking the low-frequency power supply signal from reversely transmitting to the second coupling coil.

3. The power-on communication multiplexing circuit of claim 2, wherein the radio frequency modulation circuit comprises a first transistor and a second transistor;

4. The power supply communication multiplexing circuit of claim 2, wherein the first frequency selective filter circuit comprises a coupling capacitor, a first end of the coupling capacitor is connected to the radio frequency modulation circuit, a second end of the coupling capacitor is connected to the second coupling coil, and the coupling capacitor and the second coupling coil cooperate to couple the high frequency modulation signal to the second coupling coil and block reverse transmission of the low frequency power supply signal to the second coupling coil.

5. The powered communications multiplexing circuit of claim 2 wherein the magnetically coupled modulated transmitting circuit further comprises a first resonant circuit comprising a first resonant capacitor and a second resonant capacitor;

6. The powered communications multiplexing circuit of claim 2 wherein the magnetically coupled modulated transmitting circuit further comprises a power adjustment circuit;

7. The power supply communication multiplexing circuit of claim 1, wherein the magnetic coupling demodulation receiving circuit comprises a second frequency selection filtering circuit and a signal demodulation circuit;

8. The power supply communication multiplexing circuit of claim 7, wherein said signal demodulation circuit comprises a level adjustment circuit and a detector diode;

9. The power supply communication multiplexing circuit of claim 8, wherein the level adjustment circuit comprises a first voltage dividing resistor and a second voltage dividing resistor;

10. The power supply communication multiplexing circuit of claim 7, wherein the magnetic coupling demodulation receiving circuit further comprises a signal shaping circuit comprising a voltage comparator, a reference voltage circuit, a current limiting resistor, and a pull-up resistor;

the reference voltage circuit is used for providing a reference voltage signal;

11. The power supply communication multiplexing circuit of claim 7, wherein the magnetic coupling demodulation receiving circuit further comprises a second resonant circuit, and the second resonant circuit is connected to the first coupling coil and the second frequency-selective filter circuit, and is configured to perform resonance processing on a signal received by the first coupling coil, and output a high-frequency modulated signal after resonance to the second frequency-selective filter circuit.

12. The powered communications multiplexing circuit of claim 11 wherein the second resonant circuit comprises a third resonant capacitor having a first end connected to a node between the first end of the first coupling coil and the second frequency selective filter circuit and a second end connected to the second end of the first coupling coil and ground.

13. The laser radar comprises a fixed base and a rotary platform, wherein a driving motor is arranged on the fixed base and connected with the rotary platform for driving the rotary platform to rotate; further comprising the power-supplied communication multiplexing circuit of any one of claims 1-12;