A contactless end-to-end power carrier power supply communication device for underground mines

Abstract

The invention relates to an underground contactless end-to-end power carrier power supply communication device, comprising a transmitting short section and a receiving short section. The transmitting short section comprises a transmitting casing assembly, a transmitting control circuit board and a transmitting winding magnetic ring group. The transmitting winding magnetic ring group ring sleeve is embedded in the inner circumference of the lower end of the transmitting casing assembly. The transmitting control circuit board is embedded in the interior of the transmitting casing assembly, and the transmitting control circuit board is electrically connected to the transmitting winding magnetic ring group. The receiving short section comprises a receiving casing assembly, a receiving control circuit board and a receiving winding magnetic ring group. The receiving winding magnetic ring group ring sleeve is embedded in the inner circumference of the receiving casing assembly. The receiving casing assembly is embedded in the receiving control circuit board, and the receiving control circuit board is electrically connected to the receiving winding magnetic ring group. The invention can reserve a central channel, and the well logging instrument passing through the central channel does not affect the normal power supply and communication of underground equipment, thereby ensuring that the power supply and communication of the secondary measurement and adjustment operation on site is not interrupted.

Description

Technical Field

[0001] The invention belongs to the technical field of wireless power supply communication for oil field downhole equipment, and in particular relates to an downhole non-contact end-to-end power carrier power supply communication device. Background Art

[0002] With the development of electrification and intelligence of oil logging technology, oilfield production well testing and logging are increasingly dependent on high-precision downhole logging instruments. Traditional downhole logging instruments can be roughly divided into cable-powered logging instruments and battery-powered logging instruments according to different power supply methods. Cable-powered logging instruments can simultaneously realize the power supply and single-core cable communication of downhole instruments, but cable-powered logging instruments need to be constructed with cables and the cables are placed underground for a long time. There is a risk of leakage at the connection between the cable and the downhole instrument, and the long-term power supply reliability is not high. The built-in battery life of battery-powered logging instruments is limited, and the collected data is stored inside the downhole instrument, which cannot realize real-time data interaction with wellhead equipment. In recent years, downhole instruments have been powered by non-contact power supply technology, which completes power transmission by inserting and docking a pair of solenoid coils. However, for wireless communication needs, a set of electromagnetic coupling communication coils or microwave communication modules and supporting cables need to be added. The solenoid coil docking method makes it impossible to arrange instrument channels inside the downhole instrument. At the same time, the installation of electromagnetic coupling communication coils or microwave communication modules will cause the logging instrument to have a complex structure, large size, and high failure rate, which limits the promotion and application of non-contact power supply technology to a certain extent. Summary of the invention

[0003] In order to solve the above technical problems, the purpose of the present invention is to provide an underground contactless end-to-end power carrier power supply communication device. When the transmitting short section of the underground power supply and the receiving short section of the underground load are nested and plugged in, a pair of annular planes formed at the upper and lower ends of the transmitting short section and the receiving short section are non-contactly connected to realize electric energy and two-way power carrier communication. The center of the pair of annular planes can allow the design of a large-diameter instrument channel, and there is no need to add an electromagnetic coupling communication coil or a microwave communication module.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A contactless end-to-end power carrier power supply communication device for underground mines comprises a transmitting short section and a receiving short section, wherein the transmitting short section comprises a transmitting casing assembly, a transmitting control circuit board and a transmitting winding magnetic ring group, wherein the transmitting winding magnetic ring group is embedded in the inner circumference of the lower end of the transmitting casing assembly, wherein the transmitting control circuit board is embedded in the interior of the transmitting casing assembly, and the transmitting control circuit board is electrically connected to the transmitting winding magnetic ring group; wherein the receiving short section comprises a receiving casing assembly, a receiving control circuit board and a receiving winding magnetic ring group, wherein the receiving winding magnetic ring group is embedded in the inner circumference of the receiving casing assembly, wherein the receiving control circuit board is embedded in the interior of the receiving casing assembly, and the receiving control circuit board is electrically connected to the receiving winding magnetic ring group; wherein when the transmitting casing assembly is plugged into the inner circumference of the receiving casing assembly, the transmitting winding magnetic ring group is electromagnetically coupled with the receiving winding magnetic ring group at upper and lower intervals.

[0006] Further, the launching casing assembly comprises an outer launching peg protecting tube and an inner launching peg protecting tube of an inner and outer ring sleeve, the outer circumference of the inner launching peg protecting tube and the inner circumference of the outer launching peg protecting tube form an upper annular gap space, the launching winding magnetic ring group is embedded in the lower end of the upper annular gap space, and the launching control circuit board is embedded in the upper annular gap space; the receiving casing assembly comprises an inner receiving peg protecting tube and an outer receiving peg protecting tube of an inner and outer ring sleeve, one end of the receiving peg protecting tube extending out of the inner receiving peg protecting tube is used to nest the launching peg protecting tube, the outer circumference of the inner receiving peg protecting tube and the inner circumference of the outer receiving peg protecting tube form a lower annular gap space, the receiving winding magnetic ring group is embedded in the upper end of the lower annular gap space, and the receiving control circuit board is embedded in the lower annular gap space.

[0007] Furthermore, the transmitting winding magnetic ring group includes a transmitting magnetic ring and a transmitting coupling coil, and the transmitting coupling coil ring is embedded in the lower end of the transmitting magnetic ring. The receiving winding magnetic ring group includes a receiving magnetic ring and a receiving coupling coil, and the receiving coupling coil ring is embedded in the upper end of the receiving magnetic ring and is spaced opposite to the transmitting coupling coil.

[0008] Furthermore, a docking guide positioning mechanism is provided between the outer periphery of the launching casing assembly and the inner periphery of the receiving casing assembly, and the docking guide positioning mechanism is used to locate the upper and lower intervals between the launching short section and the receiving short section; a launching short section protective cover is provided at the lower end of the launching winding magnetic ring group, and a receiving short section protective cover is provided at the upper end of the receiving winding magnetic ring group.

[0009] Furthermore, the docking guide positioning mechanism includes a positioning recessed edge step arranged on the outer periphery of the transmitting casing assembly and a positioning flange step arranged on the inner periphery of the receiving casing assembly, and the positioning recessed edge step is supported on the positioning flange step to position the upper and lower spacing distance between the transmitting winding magnetic ring group and the receiving winding magnetic ring group.

[0010] Furthermore, a transmitting main control circuit and a transmitting carrier transformer are provided on the transmitting control circuit board, the transmitting carrier transformer is electrically connected to the transmitting main control circuit, and the two ends of the transmitting coupling coil are electrically connected to the transmitting carrier transformer and the transmitting main control circuit respectively; a receiving main control circuit and a receiving carrier transformer are provided on the receiving control circuit board, the receiving carrier transformer is electrically connected to the receiving main control circuit, and the two ends of the receiving coupling coil are electrically connected to the receiving carrier transformer and the receiving main control circuit respectively.

[0011] Further, the transmitting main control circuit includes a transmitting main control MCU (Microcontroller Unit), a half-bridge drive circuit unit, a bridge inverter circuit unit, a primary resonance compensation circuit unit and a transmitting carrier circuit unit. The transmitting main control MCU, the half-bridge drive circuit unit, the bridge inverter circuit unit and the primary resonance compensation circuit unit are connected in series in sequence, and the transmitting main control MCU is also bidirectionally electrically connected to the transmitting carrier circuit unit. One end of the transmitting coupling coil is electrically connected to the primary resonance compensation circuit unit, and the other end of the transmitting coupling coil, the bridge inverter circuit unit and the transmitting carrier circuit unit are all electrically connected to the transmitting carrier transformer; the receiving main control circuit includes a receiving main control MCU, a rectifier and filter circuit unit, a secondary resonance compensation circuit unit and a receiving carrier circuit unit. The receiving main control MCU is bidirectionally electrically connected to the receiving carrier circuit unit, one end of the receiving coupling coil is connected in series with the secondary resonance compensation circuit unit and the rectifier and filter circuit unit in sequence, and the other end of the receiving coupling coil, the secondary resonance compensation circuit unit and the receiving carrier circuit unit are all electrically connected to the receiving carrier transformer.

[0012] Furthermore, the transmitting carrier transformer and the receiving carrier transformer both include a carrier magnetic ring and a modulation coil group, the modulation coil group includes a primary coil, a first secondary coil and a second secondary coil, and the primary coil, the first secondary coil and the second secondary coil are wound around the outer circumference of the carrier magnetic ring at intervals.

[0013] Further, the transmitting carrier circuit unit includes a transmitting carrier modulation module and a transmitting carrier demodulation module, one end of the transmitting carrier modulation module is electrically connected to the secondary first coil of the transmitting carrier transformer, one end of the transmitting carrier demodulation module is electrically connected to the secondary second coil of the transmitting carrier transformer, and the loop ends of the bridge inverter circuit unit and the transmitting coupling coil are respectively electrically connected to the two ends of the primary coil of the transmitting carrier transformer; the receiving carrier circuit unit includes a receiving carrier modulation module and a receiving carrier demodulation module, one end of the receiving carrier modulation module is electrically connected to the secondary first coil of the receiving carrier transformer, one end of the receiving carrier demodulation module is electrically connected to the secondary second coil of the receiving carrier transformer, and the loop ends of the rectifier and filter circuit unit and the receiving coupling coil are respectively electrically connected to the two ends of the primary coil of the receiving carrier transformer.

[0014] Furthermore, the transmitting carrier modulation module includes an analog switch S1 and an analog switch S2, and the complementary PWM signals generate two OOK (On / Off Key Control) modulation signals through the analog switch S1 and the analog switch S2 respectively, and the two OOK modulation signals are sent to the half-bridge drive circuit unit and then output two half-bridge drive signals; the transmitting carrier demodulation module includes a coupling decoding subcircuit, a high-pass filtering subcircuit, an envelope detection subcircuit, a signal amplification subcircuit and a threshold comparison subcircuit, the coupling decoding subcircuit outputs a power carrier signal, and the power fundamental signal is filtered out by the high-pass filtering subcircuit to obtain a high-frequency carrier signal, the high-frequency carrier signal is demodulated by the envelope detection subcircuit to obtain a communication digital signal, the communication digital signal is amplified by the signal amplification subcircuit, and the amplified communication digital signal is processed by the threshold comparison subcircuit to output a communication digital signal compatible with the TTL level.

[0015] The present invention adopts the above technical solution, which has the following advantages and effects:

[0016] (1) The present invention provides an underground non-contact end-to-end power carrier power supply communication device. Both the transmitting short section and the receiving short section adopt a circular plane non-contact docking method. Compared with the traditional solenoid coil insertion docking scheme, while ensuring the electromagnetic coupling transmission distance and efficiency, a central channel with a certain diameter can be reserved at the center of the receiving short section and the center of the transmitting short section. The central channel can be used for the passage of measurement and adjustment instruments after the pipe string construction or equipment docking is completed without affecting the normal power supply and communication of the underground instruments, ensuring that the power supply and communication of the underground instruments are not interrupted during the secondary measurement and adjustment operation on site.

[0017] (2) The present invention provides an underground contactless end-to-end power carrier power supply communication device, which realizes power carrier through a carrier modulation module and a carrier demodulation module. The carrier modulation module and the carrier demodulation module are integrated on the transmitting short section and the receiving short section and cooperate with the carrier transformer to realize efficient carrier modulation and demodulation of high-frequency signals. There is no need to add an electromagnetic coupling communication coil or a microwave communication module to realize non-contact two-way communication, which greatly simplifies the structural design of the device and reduces the failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of an underground non-contact end-to-end power carrier power supply communication device of the present invention.

[0019] Figure 2 yes Figure 1 A magnified schematic diagram of part A.

[0020] Figure 3 It is a schematic diagram of the structure of the transmitting winding magnetic ring of the present invention.

[0021] Figure 4 yes Figure 3 BB section view.

[0022] Figure 5 It is a schematic diagram of the structure of the transmitting carrier transformer of the present invention.

[0023] Figure 6 It is a circuit principle block diagram of the present invention.

[0024] Figure 7 It is a circuit diagram of the present invention.

[0025] Figure 8 It is a circuit diagram of a transmitting carrier modulation module of the present invention.

[0026] Fig. 9 It is a circuit diagram of a transmission carrier demodulation module of the present invention.

[0027] Fig.10 It is a timing diagram of the modulation transmission signal of the present invention.

[0028] Fig.11 It is a demodulation signal timing diagram of the present invention.

[0029] The accompanying drawings are marked as follows: 1-upper cable connector, 2-transmitting control circuit board, 3-transmitting short section outer protective tube, 4-transmitting short section inner protective tube, 5-upper annular gap space, 6-transmitting magnetic ring, 7-transmitting coupling coil, 8-transmitting short section protective cover, 9-receiving short section protective cover, 10-receiving magnetic ring, 11-receiving coupling coil, 12-lower annular gap space, 13-receiving control circuit board, 14-lower cable connector, 15-receiving short section outer protective tube, 16-receiving short section inner protective tube, 17-docking guide positioning mechanism, 171-positioning concave edge step, 172-positioning flange step, 18-transmitting carrier transformer, 181-carrier magnetic ring, 182-modulation coil group, 19-receiving carrier transformer,

[0030] 21-transmitting main control circuit, 211-transmitting main control MCU, 212-half-bridge driving circuit unit, 213-bridge inverter circuit unit, 214-primary resonance compensation circuit unit, 215-transmitting carrier circuit unit, 2151-transmitting carrier modulation module, 2152-transmitting carrier demodulation module, 21521-coupling decoding subcircuit, 21522-high-pass filtering subcircuit, 21523-envelope detection subcircuit, 21524-signal amplification subcircuit, 21525-threshold comparison subcircuit, 216-cable communication circuit unit, 31-receiving main control circuit, 311-receiving main control MCU, 312-rectifying filtering circuit unit, 313-secondary resonance compensation circuit unit, 314-receiving carrier circuit unit, 3141-receiving carrier modulation module, 3142-receiving carrier demodulation module. DETAILED DESCRIPTION

[0031] The embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings so that the purpose, features and advantages of the present invention can be more clearly understood. It should be understood that the embodiments shown in the accompanying drawings are not intended to limit the scope of the present invention, but are only intended to illustrate the essential spirit of the technical solution of the present invention.

[0032] like Figure 1-Figure 4 As shown. The present invention provides an underground contactless end-to-end power carrier power supply communication device, including a transmitting short section and a receiving short section. The transmitting short section includes a transmitting casing assembly, a transmitting control circuit board 2 and a transmitting winding magnetic ring group. The transmitting winding magnetic ring group is embedded in the inner circumference of the lower end of the transmitting casing assembly. The transmitting control circuit board 2 is embedded in the interior of the transmitting casing assembly, and the transmitting control circuit board 2 is electrically connected to the transmitting winding magnetic ring group. The receiving short section includes a receiving casing assembly, a receiving control circuit board 13 and a receiving winding magnetic ring group. The receiving winding magnetic ring group is embedded in the inner circumference of the receiving casing assembly. The receiving control circuit board 13 is embedded in the interior of the receiving casing assembly, and the receiving control circuit board 13 is electrically connected to the receiving winding magnetic ring group. When the transmitting casing assembly is plugged into the inner circumference of the receiving casing assembly, the transmitting winding magnetic ring group and the receiving winding magnetic ring group are electromagnetically coupled at intervals above and below.

[0033] Specifically, the transmitting short section also includes an upper cable connector 1, one end of which is electrically connected to the transmitting control circuit board 2, and the other end of which extends out of the transmitting casing assembly and is connected to the ground control device through the upper power supply cable. The receiving short section also includes a lower cable connector 14, one end of which is electrically connected to the receiving control circuit board 13, and the other end of which extends out of the receiving casing assembly and is connected to the lower downhole instrument through the lower power supply cable. Both the transmitting short section and the receiving short section are cylindrical structures, and the transmitting short section can be plugged into the inner circumference of the receiving short section to form a non-contact sensing end face connection to realize wireless carrier transmission of power and data.

[0034] Preferably, the lower end surface of the transmitting short section and the upper end surface of the receiving short section are spaced 10 mm apart, which can provide the best inductive power and data communication transmission effect.

[0035] Further, the launch casing assembly includes an outer launch pup joint outer casing 3 and an inner launch pup joint inner casing 4 of inner and outer annular sleeves, the outer periphery of the inner launch pup joint inner casing 4 and the inner periphery of the outer launch pup joint outer casing 3 form an upper annular gap space 5, the lower end of the upper annular gap space 5 is embedded with a launch winding magnetic ring group, and the launch control circuit board 2 is embedded in the upper annular gap space 5. The receiving casing assembly includes an inner and outer receiving pup joint inner casing 16 and an outer receiving pup joint outer casing 15 of inner and outer annular sleeves, one end of the receiving pup joint outer casing 15 extending from the receiving pup joint inner casing 16 is used to nest the launch pup joint outer casing 3, the outer periphery of the receiving pup joint inner casing 16 and the inner periphery of the receiving pup joint outer casing 15 form a lower annular gap space 12, the upper end of the lower annular gap space 12 is embedded with a receiving winding magnetic ring group, and the receiving control circuit board 13 is embedded in the lower annular gap space 12.

[0036] Specifically, the transmitting control circuit board 2 is located in the upper annular gap space 5 at the upper end of the transmitting winding magnetic ring group, the upper end of the upper cable connector 1 extends out of the upper annular gap space 5, the receiving control circuit board 13 is located in the upper annular gap space 5 at the lower end of the receiving winding magnetic ring group, and the lower end of the lower cable connector 14 extends out of the lower annular gap space 12. When the transmitting short section is inserted into the receiving short section, the inner protective tube 4 of the transmitting short section and the inner protective tube 16 of the receiving short section are relatively connected up and down, the center of the transmitting winding magnetic ring group and the receiving winding magnetic ring group can be passed by the measuring and adjusting instrument, and the transmitting winding magnetic ring group and the receiving winding magnetic ring group are relatively spaced up and down to perform wireless carrier communication through magnetic coupling.

[0037] Further, the transmitting winding magnetic ring group includes a transmitting magnetic ring 6 and a transmitting coupling coil 7, and the transmitting coupling coil 7 is embedded in the lower end of the transmitting magnetic ring 6. The receiving winding magnetic ring group includes a receiving magnetic ring 10 and a receiving coupling coil 11, and the receiving coupling coil 11 is embedded in the upper end of the receiving magnetic ring 10 and is spaced opposite to the transmitting coupling coil 7. The transmitting winding magnetic ring group and the receiving winding magnetic ring group have the same structure.

[0038] Specifically, the transmitting magnetic ring 6 and the receiving magnetic ring 10 both include a magnetic core and a ferrite, the ferrite is wrapped around the outer periphery of the magnetic core, and an annular shielding groove is provided inside one end of the ferrite of the transmitting magnetic ring 6 and the receiving magnetic ring 10. The transmitting coupling coil 7 and the receiving coupling coil 11 are both formed by winding a ring of Litz wire in a plane stacked in the corresponding annular shielding groove, and the Litz wire is wound around the annular shielding groove. Since the transmitting magnetic ring 6 and the receiving magnetic ring 10 have annular shielding grooves, when the transmitting coupling coil or the receiving coupling coil is stacked and wound in the corresponding annular shielding grooves, the transmitting magnetic ring 6 and the receiving magnetic ring 10 enhance the magnetic field directionality between the transmitting coupling coil and the receiving coupling coil, reduce the leakage magnetic effect, increase the coupling coefficient between the transmitting coupling coil and the receiving coupling coil, and minimize the absorption of the magnetic field by the transmitting sheath assembly and the receiving sheath assembly, thereby improving the power transmission efficiency and ensuring the non-contact communication distance.

[0039] As a preference, the magnetic permeability of the ferrite is 3500-7000 H / m, the inner diameter of the ferrite is 63 mm, the outer diameter is 100 mm, the dimensions of the annular shielding slot are 15 mm in width and 5 mm in height, and the dimensions of the Litz wire are 0.1 mm×40 strands.

[0040] Furthermore, the lower end of the transmitting winding magnetic ring group is sleeved with a transmitting short section protective cover 8, and the upper end of the receiving winding magnetic ring group is sleeved with a receiving short section protective cover 9. Both the transmitting short section protective cover 8 and the receiving short section protective cover 9 are annular structures and are spaced up and down.

[0041] Specifically, the annular plane at the lower end of the transmitting short section protective cover 8 is used as the induction docking upper plane, and the annular plane at the upper end of the receiving short section protective cover 9 is used as the induction docking lower plane, and the induction docking upper plane and the induction docking lower plane are spaced up and down. The transmitting winding magnetic ring group is embedded in the transmitting short section protective cover 8 as a whole, and the receiving winding magnetic ring group is embedded in the receiving short section protective cover 9 as a whole to ensure that the coupling magnetic field passes through without obstruction.

[0042] Furthermore, a docking guide positioning mechanism 17 is provided between the outer periphery of the launching casing assembly and the inner periphery of the receiving casing assembly, and the docking guide positioning mechanism 17 is used to locate the distance between the launching short section and the receiving short section. When the launching casing assembly is plugged into the inner periphery of the receiving casing assembly, the docking guide positioning mechanism 17 can ensure that the launching winding magnetic ring group and the receiving winding magnetic ring group are spaced opposite to each other, and at the same time ensure that the launching casing assembly and the receiving casing assembly are coaxially nested.

[0043] Furthermore, the docking guide positioning mechanism 17 includes a positioning recessed edge step 171 arranged on the outer periphery of the transmitting casing assembly and a positioning flange step 172 arranged on the inner periphery of the receiving casing assembly. The positioning recessed edge step 171 is supported on the positioning flange step 172 to position the upper and lower intervals between the transmitting winding magnetic ring group and the receiving winding magnetic ring group.

[0044] Specifically, the outer periphery of the upper end of the launch pup joint outer protective tube 3 and the inner periphery of the upper end of the receiving pup joint outer protective tube 15 are spaced together, a positioning recessed edge step 171 is provided on the outer periphery of the lower end of the launch pup joint outer protective tube 3, the outer peripheral surface of the launch pup joint outer protective tube 3 located at the lower end of the positioning recessed edge step 171 is an inverted conical surface, a positioning flange step 172 is provided on the middle inner periphery of the receiving pup joint outer protective tube 15, and the inner peripheral surface of the receiving pup joint outer protective tube 15 at the upper end of the positioning flange step 172 is an inverted conical surface. When the positioning recessed edge step 171 and the positioning flange step 172 are butt-jointed and supported, a pair of inverted conical surfaces are nested and matched with each other to realize the vertical centering of the launch pup joint outer protective tube 3 and the receiving pup joint outer protective tube 15, so that the launch pup joint inner protective tube 4 and the receiving pup joint inner protective tube 16 are coaxially connected vertically.

[0045] Further, the transmitting control circuit board 2 is provided with a transmitting main control circuit and a transmitting carrier transformer, the transmitting carrier transformer is electrically connected to the transmitting main control circuit, and the two ends of the transmitting coupling coil 7 are electrically connected to the transmitting carrier transformer and the transmitting main control circuit respectively. The receiving control circuit board 13 is provided with a receiving main control circuit and a receiving carrier transformer, the receiving main control circuit is electrically connected to the receiving carrier transformer, and the two ends of the receiving coupling coil 11 are electrically connected to the receiving carrier transformer and the receiving main control circuit respectively.

[0046] Further, if Figure 5 The transmitting carrier transformer 18 and the receiving carrier transformer both include a carrier magnetic ring 181 and a modulation coil group 182. The modulation coil group 182 includes a primary coil, a first secondary coil and a second secondary coil. The primary coil, the first secondary coil and the second secondary coil are wound around the outer periphery of the carrier magnetic ring 181 at intervals.

[0047] Specifically, in order to reduce magnetic loss and ensure high-frequency carrier characteristics, the carrier magnetic ring 181 of the transmitting carrier transformer 18 and the receiving carrier transformer is preferably a ferrite magnetic ring, the magnetic permeability of the ferrite magnetic ring is 500-1000H / m, and the size of the ferrite magnetic ring is 9mm in outer diameter, 5mm in inner diameter, and 3mm in height. The primary coil, the first secondary coil, and the second secondary coil of the modulation coil group 182 are all wound with a single layer of 0.1mm×40 strands of Litz wire. The winding length of the first secondary coil and the second secondary coil is the same, and the winding inductance value is 1 / 10-1 / 20 of the winding inductance value of the transmitting coupling coil 7 or the receiving coupling coil 11.

[0048] Further, if Figure 6As shown. The transmitting main control circuit 21 includes a transmitting main control MCU 211, a half-bridge driving circuit unit 212, a bridge inverter circuit unit 213, a primary resonance compensation circuit unit 214 and a transmitting carrier circuit unit 215. The transmitting main control MCU 211, the half-bridge driving circuit unit 212, the bridge inverter circuit unit 213 and the primary resonance compensation circuit unit 214 are connected in series in sequence. The transmitting main control MCU 211 is also bidirectionally electrically connected to the transmitting carrier circuit unit 215. One end of the transmitting coupling coil 7 is electrically connected to the primary resonance compensation circuit unit 214, and the other end of the transmitting coupling coil 7, the bridge inverter circuit unit 213 and the transmitting carrier circuit unit 215 are all electrically connected to the transmitting carrier transformer 18. The receiving main control circuit 31 includes a receiving main control MCU311, a rectifier and filter circuit unit 312, a secondary resonance compensation circuit unit 313 and a receiving carrier circuit unit 314. The receiving main control MCU311 is electrically connected to the receiving carrier circuit unit 314 in a bidirectional manner. One end of the receiving coupling coil 11 is connected in series with the secondary resonance compensation circuit unit 313 and the rectifier and filter circuit unit 312 in sequence. The other end of the receiving coupling coil 11, the secondary resonance compensation circuit unit 313 and the receiving carrier circuit unit 314 are all electrically connected to the receiving carrier transformer 19.

[0049] Specifically, the transmitting main control circuit 21 also includes a cable communication circuit unit 216, which is electrically connected to the upper cable connector 1, and realizes bidirectional cable carrier communication between the transmitting short section and the ground control device through the cable communication circuit unit 216. The cable communication circuit unit 216 is connected to the transmitting main control MCU211 through a serial port, and the transmitting main control MCU211 outputs a complementary PWM signal to the half-bridge drive circuit unit 212, and the half-bridge drive circuit unit 212 outputs a half-bridge drive signal to the bridge inverter circuit unit 213 according to the complementary PWM signal, and the bridge inverter circuit unit 213 inverts the half-bridge drive signal to generate a power fundamental wave signal, and transmits the power fundamental wave signal to the primary resonance compensation circuit unit 214, and the primary resonance compensation circuit unit 214 compensates the inverted power fundamental wave signal and sends the compensated power fundamental wave signal to the transmitting coupling coil 7, and the receiving coupling coil 11 receives the power fundamental wave signal from the transmitting coupling coil 7.

[0050] The bridge inverter circuit unit 213 is electrically connected to the transmitting carrier transformer 18 to couple the transmitting carrier signal to the power fundamental wave signal to realize the modulation of the power fundamental wave signal. The transmitting carrier circuit unit 215 is used for carrier modulation of the transmitting short section and receiving demodulated signals through a serial port and a transmitting main control MCU 211. The bridge inverter circuit unit 213 is connected in series with the transmitting carrier transformer 18 and the transmitting coupling coil 7 to form a transmitting main power circuit. The bridge inverter circuit unit 213 uses a resonant capacitor series compensation to ensure that the transmitting main power circuit is in an LC resonance state.

[0051] The receiving coupling coil 11 outputs the received power fundamental wave signal to the rectifier filter circuit unit 312 through the secondary resonance compensation circuit unit 313. The rectifier filter circuit unit 312 rectifies and filters the power fundamental wave signal and then outputs a DC load power supply. The rectifier filter circuit unit 312 is connected to the lower cable connector 14. The DC load power supply supplies power to the lower downhole instrument through the lower cable connector 14 and the lower power supply cable. The receiving carrier circuit unit 314 communicates bidirectionally with the receiving main control MCU 311 through the serial port to receive the carrier modulation of the short section and receive the demodulated signal. The secondary resonance compensation circuit unit 313 is connected in series with the receiving carrier transformer 19 and the receiving coupling coil 11 to form a receiving main power circuit. The secondary resonance compensation circuit unit 313 uses a resonant capacitor series compensation to ensure that the receiving main power circuit is in an LC resonance state.

[0052] Furthermore, the transmitting carrier circuit unit 215 includes a transmitting carrier modulation module 2151 and a transmitting carrier demodulation module 2152. The modulation coil group of the transmitting carrier transformer 18 is a transmitting modulation coil group. The transmitting modulation coil group includes a transmitting primary coil Lt, a transmitting secondary first coil Lt1 and a transmitting secondary second coil Lt2. One end of the transmitting carrier modulation module 2151 is electrically connected to the transmitting secondary first coil Lt1, and one end of the transmitting carrier demodulation module 2152 is electrically connected to the transmitting secondary second coil Lt2. The loop ends of the bridge inverter circuit unit 213 and the transmitting coupling coil 7 are respectively electrically connected to the two ends of the transmitting primary coil Lt. The receiving carrier circuit unit 314 includes a receiving carrier modulation module 3141 and a receiving carrier demodulation module 3142. The modulation coil group of the receiving carrier transformer 19 is a receiving modulation coil group, which includes a receiving primary coil Lr, a receiving secondary first coil Lr1 and a receiving secondary second coil Lr2. One end of the receiving carrier modulation module 3141 is electrically connected to the receiving secondary first coil Lr1, and one end of the receiving carrier demodulation module 3142 is electrically connected to the receiving secondary second coil Lr2. The rectifier filter circuit unit 312 and the loop end of the receiving coupling coil 11 are electrically connected to the two ends of the receiving primary coil Lr. The transmitting main control MCU211 controls the carrier modulation of the transmitting carrier modulation module 2151 through the serial port while receiving the demodulation signal of the transmitting carrier demodulation module 2152. The receiving main control MCU311 controls the carrier modulation of the receiving carrier modulation module 3141 through the serial port while receiving the demodulation signal of the receiving carrier demodulation module 3142.

[0053] Further, if Figure 7As shown. In the transmitting main control circuit, the main control MCU generates a 50K dual-channel complementary PWM signal, which is connected to the half-bridge drive circuit unit. The half-bridge drive circuit unit is built with two half-bridge drive chips. Each half-bridge drive chip can generate a 12V gate-source drive voltage for the high-side and low-side MOS (Metal Oxide Semiconductor Field Effect Transistor) of the half-bridge. One half-bridge drive chip outputs complementary PWMN1 and PWMP1 signals, and the other half-bridge drive chip outputs complementary PWMN2 and PWMP2 signals. MOS tubes Q1, Q2, Q3, and Q4 form a full-bridge drive circuit. The bridge inverter circuit unit adopts an H-bridge circuit structure, and the half-bridge drive circuit unit provides PWMN1, PWMP1, PWMN2, and PWMP2 signals to drive the output power fundamental wave signal.

[0054] The transmitting primary coil Lt, the transmitting coupling coil 7 and the resonant capacitor C1 are connected in series in sequence to form the transmitting main power circuit, and the transmitting secondary first coil Lt1, the capacitor C1.1 and the transmitting signal source VS1 are connected in series in sequence to form the transmitting carrier transmitting circuit. The transmitting carrier transmitting circuit can couple the high-frequency carrier signal to the transmitting main power circuit. The transmitting secondary second coil Lt2, the resistor R1.2 are connected in series and then connected in parallel with the capacitor C1.2 to form the transmitting carrier receiving circuit, which can couple and receive the power carrier signal of the transmitting main power circuit for the post-stage decoding processing of the transmitting end.

[0055] In the receiving main control circuit, the receiving primary coil Lr, the receiving coupling coil 11 and the resonant capacitor C2 are connected in series in sequence to form a receiving main power circuit, and the receiving secondary first coil Lr1, the capacitor C2.1 and the receiving signal source VS2 are connected in series in sequence to form a receiving carrier transmission circuit. The receiving carrier transmission circuit can couple the high-frequency carrier signal to the receiving main power circuit. The receiving secondary second coil Lr2, the resistor R2.2 are connected in series and then connected in parallel with the capacitor C2.2 to form a receiving carrier receiving circuit.

[0056] The rectifier and filter circuit unit includes a bridge rectifier circuit, a resistor RL and a capacitor CL form an RC filter, a secondary side resonance compensation circuit unit includes a resonant capacitor C2, one end of the receiving coupling coil 11 is connected in series with the receiving primary coil Lr and then connected to the bridge rectifier circuit, the other end of the receiving coupling coil 11 is connected in series with the resonant capacitor C2 and then connected to the bridge rectifier circuit, and the output end of the bridge rectifier circuit is connected to the RC filter to output a stable DC load power supply.

[0057] Furthermore, in order to maximize the transmission efficiency of high-frequency carrier signals, the transmitting main power circuit and the receiving main power circuit must be in an LC resonance state, and the resonance frequency fp is: , where the main inductance of the transmitting main power circuit and the receiving main power circuit is Lp, the resonant inductance is C, and the interference inductance is Lc. At this time, the resonant parameters of the transmitting main power circuit and the receiving main power circuit are exactly the same. The inductance of the transmitting coupling coil 7 is set to L1, the inductance of the receiving coupling coil 11 is set to L2, the inductance of the transmitting primary coil Lt is set to L3, the inductance of the receiving primary coil Lr is set to L4, the capacitance value of the resonant capacitor C1 is CM, the capacitance value of the resonant capacitor C2 is CN, the equivalent resistance of the transmitting carrier transmitting circuit and the receiving carrier transmitting circuit is RF, and the equivalent resistance of the transmitting carrier receiving circuit and the receiving carrier receiving circuit is RJ, then Lp=L1=L2, Lc=L3=L4, C=CM=CN, RF=RJ. The resonant capacitor C1, the inductance L1 of the transmitting coupling coil, the resonant capacitor C2, and the inductance L2 of the transmitting coupling coil are respectively designed to be in a series resonance state at a high-frequency carrier frequency, and the resonant frequency fp is preferably a typical value of the power fundamental wave of 50k.

[0058] Furthermore, in order to ensure the main inductance Lp and reduce the influence of the interference inductance Lc on the stability of the power fundamental wave signal, the interference inductance Lc should be controlled at 1 / 10 to 1 / 20 of the inductance value of the main inductance Lp. At this time, the resonant frequency of the power fundamental wave signal can be controlled at 40 to 80 Khz by adjusting the size of the resonant capacitor C1 or C2.

[0059] In the present invention, the circuit structures of the transmitting carrier modulation module 2151 and the receiving carrier modulation module 3141 are the same, and the transmitting carrier modulation module 2151 is taken as an example for description.

[0060] like Figure 8 As shown. The transmitting carrier modulation module 2151 adopts OOK modulation, and the transmitting carrier modulation module 2151 includes an analog switch S1 and an analog switch S2. After the transmitting short section sends the complementary PWMN signal and PWMP signal through the serial port, the analog switch S1 and the analog switch S2 generate two OOK modulation signals PWM1 and PWM2. The two OOK modulation signals are respectively sent to the half-bridge drive control chip UI and then output the two half-bridge drive signals HO and LO. The half-bridge drive signal is loaded into the transmitting carrier transmission loop after power amplification. MOS tube Q1 and MOS tube Q2 constitute a chopper half-bridge power amplifier. The model of the half-bridge drive chip U1 is preferably AUIRS21811STR.

[0061] In the present invention, the circuit structures of the transmitting carrier demodulation module 2152 and the receiving carrier demodulation module 3142 are the same, and the transmitting carrier demodulation module 2152 is taken as an example for description.

[0062] like Fig. 9The transmission carrier demodulation module 2152 includes a coupling decoding subcircuit 21521, a high-pass filtering subcircuit 21522, an envelope detection subcircuit 21523, a signal amplification subcircuit 21524 and a threshold comparison subcircuit 21525. The coupling decoding subcircuit 21521 includes a transmitting secondary second coil Lt2 and a capacitor C1.2. The transmission carrier receiving circuit couples and receives the power carrier signal of the transmitting main power circuit and sends it to the coupling decoding subcircuit 21521. At this time, the transmitting secondary second coil Lt2 and the capacitor C1.2 are in a resonant receiving state. The high-pass filter subcircuit 21522 is a second-order high-pass filter with a cut-off frequency of 150KHz, including capacitor C8, capacitor C9, resistor R9 and resistor R10. One end of capacitor C8 is connected to one end of capacitor C1.2, and the other end of capacitor C8 is connected in series with capacitor C9. One end of resistor R9 and one end of resistor R10 are grounded and connected to the other end of capacitor C1.2. The other end of resistor R9 is connected to the series connection end of capacitor C8 and capacitor C9. The other end of resistor R10 is connected to the other end of capacitor C9. Capacitor C8 and resistor R9 constitute a first-order high-pass filter, and capacitor C9 and resistor R10 constitute a second-order high-pass filter. The second-order high-pass filter can further filter out the high-frequency noise of the signal. The envelope detection subcircuit 21523 includes a diode D1, a resistor R12, a resistor R8 and a capacitor C4. One end of the diode D1 is connected to the common end of the resistor R10 and the capacitor C9. The other end of the diode D1 is connected in series with one end of the resistor R12 for rectifying the input high-frequency signal. The two ends of the resistor R8 are respectively connected to the other end of the resistor R10 and the other end of the resistor R12. The capacitor C4 is connected in parallel with the resistor R8. The capacitor C4 assists the diode D1 in extracting the envelope line from the rectified signal. The envelope detection subcircuit 21523 removes the high-frequency components in the modulated signal and only retains the low-frequency envelope signal, i.e., the low-frequency modulation signal. The signal amplification sub-circuit 21524 includes a first operational amplifier U1A, a resistor R13, a resistor R6, a capacitor C5 and a resistor R11. The resistor R13 is an input resistor. One end of the resistor R13 is connected to the common end of the capacitor C4 and the resistor R12, and the other end is connected to the positive input end of the first operational amplifier U1A. The resistor R11 is a load resistor. The resistor R11 is connected between the reverse input end and the output end of the first operational amplifier U1A. One end of the resistor R6 is connected in series with the capacitor C5 and then grounded to form a feedback network. The other end of the resistor R6 is connected to the reverse input end of the first operational amplifier U1A.The threshold comparison subcircuit 21525 includes a second operational amplifier U1B, a resistor R14, a resistor R5, a resistor R7, a resistor R15, a capacitor C6 and a capacitor C7. One end of the resistor R14 is connected to the output end of the first operational amplifier U1A, and the other end of the resistor R14 is connected in series with the resistor R5 and then connected to the positive input end of the second operational amplifier U1B. The resistor R15 is connected between the positive input end and the output end of the second operational amplifier U1B. One end of the capacitor C7 is grounded, and the other end is connected to the series connection end of the resistor R14 and the resistor R5. One end of the resistor R7 is connected to the other end of the capacitor C7. One end of the capacitor C6 is grounded, and the other end is connected to the other end of the resistor R7 and then connected to the reverse input end of the second operational amplifier U1B. The resistor R14 and the capacitor C7 form a low-pass filter. The low-pass filter is used to filter out high-frequency noise of the signal. The second operational amplifier U1B can process the signal according to the set threshold value and output the corresponding logic level.

[0063] In the transmitting carrier demodulation module 2152, the power carrier signal output by the coupling decoding subcircuit 21521 is first filtered out by the high-pass filtering subcircuit 21522 to remove the power fundamental signal, and only the high-frequency carrier signal is retained. The high-frequency carrier signal can be demodulated into the communication digital signal to be sent by the envelope detection subcircuit 21523. The communication digital signal is pre-amplified by the signal amplification subcircuit 21524. The amplified communication digital signal is processed by the threshold comparison subcircuit 21525 and then output as a communication digital signal compatible with the TTL level, completing the carrier demodulation process.

[0064] like Fig.10 As shown. The timing analysis of the OOK modulation transmission signal of the present invention shows that the switch signal is the serial communication digital signal transmitted, and the modulated square wave signal generated by the modulation of the serial communication digital signal realizes the transmission switch signal and the 500Khz high-frequency carrier OOK modulation processing. The power carrier signal is the power carrier signal generated by effectively loading the power fundamental wave signal after the modulated square wave signal is coupled to the transmitting main power circuit through the transmitting carrier transformer. Finally, the low-frequency power fundamental wave signal carries the high-frequency OOK modulation signal carrier information and is sent from the transmitting coupling coil, realizing the transmission of the OOK modulation to the electromagnetically coupled power carrier signal.

[0065] like Fig.11 As shown. The demodulation signal timing analysis of the present invention shows that the power carrier signal is coupled and received by the receiving carrier transformer, and the power carrier signal and the high-frequency carrier signal can be decoupled and separated by filtering. The high-frequency carrier signal is restored to the serial communication digital signal after envelope detection and comparison processing. Finally, the present invention fully realizes the non-contact power supply and two-way communication signal transmission based on the power carrier and electromagnetic coupling principle.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. 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. An underground contactless end-to-end power carrier power supply communication device, characterized in that: The invention comprises a launching short section and a receiving short section, wherein the launching short section comprises a launching sleeve assembly, a launching control circuit board (2) and a launching winding magnetic ring group, wherein the launching winding magnetic ring group is sleeved and embedded in the inner circumference of the lower end of the launching sleeve assembly, wherein the launching control circuit board (2) is embedded in the interior of the launching sleeve assembly, and wherein the launching control circuit board (2) is electrically connected to the launching winding magnetic ring group; the receiving short section comprises a receiving sleeve assembly, a receiving control circuit board (13) and a receiving winding magnetic ring group, wherein the receiving winding magnetic ring group is sleeved and embedded in the inner circumference of the receiving sleeve assembly, wherein the receiving control circuit board (13) is embedded in the interior of the receiving sleeve assembly, and wherein the receiving control circuit board (13) is electrically connected to the receiving winding magnetic ring group; the launching sleeve assembly is plugged into the receiving sleeve assembly. When the receiving casing assembly is in the receiving casing assembly, the transmitting winding magnetic ring group is electromagnetically coupled with the receiving winding magnetic ring group at an upper and lower interval; the transmitting winding magnetic ring group comprises a transmitting magnetic ring (6) and a transmitting coupling coil (7), and the transmitting coupling coil (7) is embedded in the lower end of the transmitting magnetic ring (6); the receiving winding magnetic ring group comprises a receiving magnetic ring (10) and a receiving coupling coil (11), and the receiving coupling coil (11) is embedded in the upper end of the receiving magnetic ring (10) and is spaced opposite to the transmitting coupling coil (7); a docking guide positioning mechanism (17) is provided between the outer periphery of the transmitting casing assembly and the inner periphery of the receiving casing assembly, and the docking guide positioning mechanism (17) is used to locate the distance between the transmitting short section and the receiving short section.

2. According to claim 1, a non-contact end-to-end power carrier power supply communication device for underground mines is characterized by: The launching sleeve assembly comprises an outer launching short section outer sleeve (3) and an inner launching short section inner sleeve (4) formed by inner and outer rings, the outer circumference of the launching short section inner sleeve (4) and the inner circumference of the launching short section outer sleeve (3) forming an upper annular gap space (5), the launching winding magnetic ring group is embedded at the lower end of the upper annular gap space (5), and the launching control circuit board (2) is embedded in the upper annular gap space (5); the receiving sleeve assembly comprises an inner and outer receiving short section inner sleeve (16) and a receiving short section inner sleeve (17). A receiving short section outer protective tube (15), one end of the receiving short section outer protective tube (15) extending out of the receiving short section inner protective tube (16) is used to be nested in the transmitting short section outer protective tube (3), the outer periphery of the receiving short section inner protective tube (16) and the inner periphery of the receiving short section outer protective tube (15) form a lower annular gap space (12), the upper end of the lower annular gap space (12) is embedded with the receiving winding magnetic ring group, and the receiving control circuit board (13) is embedded in the lower annular gap space (12).

3. An underground non-contact end-to-end power carrier power supply communication device according to claim 1 or 2, characterized in that: The lower end of the transmitting winding magnetic ring group is sleeved with a transmitting short section protective cover (8), and the upper end of the receiving winding magnetic ring group is sleeved with a receiving short section protective cover (9).

4. According to claim 3, the underground non-contact end-to-end power carrier power supply communication device is characterized in that: The docking guide positioning mechanism (17) comprises a positioning recessed edge step (171) arranged on the outer periphery of the transmitting casing assembly and a positioning flange step (172) arranged on the inner periphery of the receiving casing assembly, wherein the positioning recessed edge step (171) is supported on the positioning flange step (172) to position the upper and lower spacing distance between the transmitting winding magnetic ring group and the receiving winding magnetic ring group.

5. The underground non-contact end-to-end power carrier power supply communication device according to claim 4, characterized in that: The transmitting control circuit board (2) is provided with a transmitting main control circuit (21) and a transmitting carrier transformer (18), the transmitting carrier transformer (18) is electrically connected to the transmitting main control circuit (21), and the two ends of the transmitting coupling coil (7) are electrically connected to the transmitting carrier transformer (18) and the transmitting main control circuit (21), respectively; the receiving control circuit board (13) is provided with a receiving main control circuit (31) and a receiving carrier transformer (19), the receiving carrier transformer (19) is electrically connected to the receiving main control circuit (31), and the two ends of the receiving coupling coil (11) are electrically connected to the receiving carrier transformer (19) and the receiving main control circuit (31), respectively.

6. The underground non-contact end-to-end power carrier power supply communication device according to claim 5, characterized in that: The transmitting main control circuit (21) comprises a transmitting main control MCU (211), a half-bridge driving circuit unit (212), a bridge inverter circuit unit (213), a primary resonance compensation circuit unit (214) and a transmitting carrier circuit unit (215); the transmitting main control MCU (211), the half-bridge driving circuit unit (212), the bridge inverter circuit unit (213) and the primary resonance compensation circuit unit (214) are connected in series in sequence; the transmitting main control MCU (211) is bidirectionally electrically connected to the transmitting carrier circuit unit (215); one end of the transmitting coupling coil (7) is electrically connected to the primary resonance compensation circuit unit (214); the other end of the transmitting coupling coil (7), the bridge inverter circuit unit (213) and the transmitting carrier circuit unit (215) are electrically connected to the primary resonance compensation circuit unit (214); The carrier circuit units (215) are all electrically connected to the transmitting carrier transformer (18); the receiving main control circuit (31) comprises a receiving main control MCU (311), a rectifying and filtering circuit unit (312), a secondary resonance compensation circuit unit (313) and a receiving carrier circuit unit (314); the receiving main control MCU (311) and the receiving carrier circuit unit (314) are bidirectionally electrically connected; one end of the receiving coupling coil (11) is connected in series with the secondary resonance compensation circuit unit (313) and the rectifying and filtering circuit unit (312) in sequence; the other end of the receiving coupling coil (11), the secondary resonance compensation circuit unit (313) and the receiving carrier circuit unit (314) are all electrically connected to the receiving carrier transformer (19).

7. The underground non-contact end-to-end power carrier power supply communication device according to claim 6, characterized in that: The transmitting carrier transformer (18) and the receiving carrier transformer (19) both comprise a carrier magnetic ring (181) and a modulation coil group (182); the modulation coil group (182) comprises a primary coil, a first secondary coil and a second secondary coil; the primary coil, the first secondary coil and the second secondary coil are wound around the periphery of the carrier magnetic ring (181) at intervals.

8. The underground non-contact end-to-end power carrier power supply communication device according to claim 7, characterized in that: The transmitting carrier circuit unit (215) comprises a transmitting carrier modulation module (2151) and a transmitting carrier demodulation module (2152); one end of the transmitting carrier modulation module (2151) is electrically connected to the secondary first coil of the transmitting carrier transformer (18); one end of the transmitting carrier demodulation module (2152) is electrically connected to the secondary second coil of the transmitting carrier transformer (18); and the loop ends of the bridge inverter circuit unit (213) and the transmitting coupling coil (7) are electrically connected to the two ends of the primary coil of the transmitting carrier transformer (18); The receiving carrier circuit unit (314) comprises a receiving carrier modulation module (3141) and a receiving carrier demodulation module (3142); one end of the receiving carrier modulation module (3141) is electrically connected to the secondary first coil of the receiving carrier transformer (19); one end of the receiving carrier demodulation module (3142) is electrically connected to the secondary second coil of the receiving carrier transformer (19); and the loop ends of the rectifier filter circuit unit (312) and the receiving coupling coil (11) are electrically connected to the two ends of the primary coil of the receiving carrier transformer (19), respectively.

9. The underground non-contact end-to-end power carrier power supply communication device according to claim 8, characterized in that: The transmitting carrier modulation module (2151) comprises an analog switch S1 and an analog switch S2, and the complementary PWM signals generate two OOK modulation signals through the analog switch S1 and the analog switch S2 respectively, and the two OOK modulation signals are sent to the half-bridge driving circuit unit (212) and then output two half-bridge driving signals; the transmitting carrier demodulation module (2152) comprises a coupling decoding subcircuit (21521), a high-pass filtering subcircuit (21522), an envelope detection subcircuit (21523), a signal amplification subcircuit (21524) and The threshold comparison subcircuit (21525) is a circuit in which the coupling decoding subcircuit (21521) outputs a power carrier signal, which is filtered out by a high-pass filtering subcircuit (21522) to obtain a high-frequency carrier signal. The high-frequency carrier signal is demodulated by an envelope detection subcircuit (21523) to obtain a communication digital signal. The communication digital signal is amplified by a signal amplification subcircuit (21524). The amplified communication digital signal is processed by the threshold comparison subcircuit (21525) to output a communication digital signal compatible with a TTL level.

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