Load change-based transformer communication system of rotary steering tool

Abstract

The invention relates to a transformer communication system, in particular to a load change-based transformer communication system of a rotary steering tool, which comprises a transformer, one end of the transformer is provided with a primary loop, and the other end of the transformer is provided with a secondary loop. A primary coil of the transformer and the main power inverter form a primary loop, the two ends of the main power inverter are connected with a first communication load in parallel, and the first communication load is connected with a communication circuit board A on a fixing component of the rotary steering tool. The carrier signal is modulated into a control carrier signal through a communication circuit board A to control voltage and current signals on a first communication load; voltage and current changes in a transformer power transmission system are caused by load changes on the first impedance matching circuit and the second impedance matching circuit at the two ends of the transformer, signal transmission is performed while power transmission at the two ends of the transformer is completed, and influences of the size of an air gap of the transformer and an air gap medium on signal transmission do not need to be considered; and extra power supply for the switching circuit is not needed.

Description

Technical Field

[0001] The invention relates to a transformer communication system, and in particular to a transformer communication system of a rotary guide tool based on load changes. Background Art

[0002] With the application of transformers in power converter technology, transformers are mainly used for power transmission. It is difficult and inefficient to use transformers for communication transmission. The existing technology uses antenna or transmission line communication theory to perform carrier communication through transformers, so that the modulated data is amplified and shaped by the power of the transmitting circuit, and the signal is coupled with the transformer power carrier. Since the existing technology has high requirements for the impedance matching of the resonant network, it is necessary to additionally power the transmitting circuit, so that the communication is affected by the ambient temperature of the transformer, the change of the transformer air gap, and the change of the medium, which can easily cause signal transmission distortion. When the power supply of the transmitting circuit is unstable or the power is small, the power of the signal received by the receiver is less than the noise, which will cause communication errors and packet loss.

[0003] Therefore, it is necessary to design a transformer transmission communication system based on load changes to improve the above problems. Summary of the invention

[0004] The object of the present invention is to overcome the defects of the prior art and provide a transformer communication system for a rotary guide tool based on load changes.

[0005] The present invention provides a transformer communication system for a rotary steering tool based on load changes, comprising a transformer;

[0006] A primary circuit is provided at one end of the transformer, and a secondary circuit is provided at the other end of the transformer;

[0007] The primary coil of the transformer and the main power inverter constitute the primary circuit, a first communication load is connected in parallel at both ends of the main power inverter, and the first communication load is connected to a communication circuit board A on a fixed component of a rotary guide tool, which is used to modulate the control carrier signal through the communication circuit board A to control the voltage and current signals on the first communication load;

[0008] The main power inverter is connected to a DC power supply, and the secondary coil of the transformer and the load constitute the secondary circuit. A second communication load is connected in parallel at both ends of the load through a rectifier circuit. The second communication load is connected to a communication circuit board B on the rotating part of the rotary guide tool, which is used to receive the voltage and current signals on the primary circuit of the circuit through magnetic coupling so that the voltage and current signals on the secondary circuit follow the changes, and the voltage and current signals on the primary circuit are obtained after filtering, detecting, amplifying and demodulating. At this point, the bidirectional transmission of data on the primary circuit and the secondary circuit at both ends of the transformer is completed.

[0009] Further, the communication circuit board A includes a control circuit, and the first communication load includes a switch device Q1 and a first impedance matching circuit connected in series;

[0010] The control circuit is connected with a switch device Q1 and a first impedance matching circuit; the switch device Q1 is used to control the on / off of the load of the first impedance matching circuit through the control circuit; the series-connected switch device Q1 and the first impedance matching circuit are connected in parallel at both ends of the primary coil of the transformer, so as to change the voltage and current at the primary coil end of the transformer;

[0011] The communication circuit board B includes a receiving circuit, and the second communication load includes a switch device Q2 and a second impedance matching circuit connected in series;

[0012] The receiving circuit is connected to a switch device Q2 and a second impedance matching circuit. The switch device Q2 controls the on / off of the load on the second impedance matching circuit through the receiving circuit. The series-connected switch device Q2 and the second impedance matching circuit are connected in parallel at both ends of the secondary coil of the transformer, so as to make the voltage and current at the secondary coil end of the transformer follow the changes.

[0013] Furthermore, the control circuit includes a host computer, to which a signal sampling circuit A, a modulator A and a demodulator A are connected; and the signal sampling circuit A and the modulator A are also connected to the switching device Q1, for collecting data on the main power inverter through the signal sampling circuit A, modulating the data into a control carrier signal through the modulator A, and sending it to the switching device Q1. The switching device Q1 controls the on and off of the first impedance matching circuit according to the control carrier signal, so as to generate voltage and current signals in the primary circuit.

[0014] Furthermore, the receiving circuit includes a lower computer, to which a signal sampler B, a signal modulator B and a signal demodulator B are connected, and the signal sampler B and the signal modulator B are also connected to the switching device Q2; it is used to collect the voltage and current signals on the primary circuit through the signal sampler B, and send them to the secondary circuit through the switching device Q2 and the second impedance matching circuit. The secondary circuit is filtered, detected, amplified and demodulated by the signal modulator B and the signal demodulator B to obtain the voltage and current signals on the primary circuit.

[0015] Furthermore, the first impedance matching circuit and the second impedance matching circuit are both composed of a resistor R0, a capacitor Cs, and an inductor Ls which are sequentially connected in series, and a capacitor Cp is connected in parallel at both ends of the inductor Ls.

[0016] Further, the impedances of the first impedance matching circuit and the second impedance matching circuit at the modulation frequency F1 are both Z1, the impedance of the main power inverter at the frequency F0 is Z0, the frequency F1 is greater than the frequency F0, and the impedance Z1 is less than the impedance Z0.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention utilizes the load changes on the first impedance matching circuit and the second impedance matching circuit at both ends of the transformer to cause the voltage and current changes in the transformer power transmission system, completes the power transmission at both ends of the transformer and performs signal transmission at the same time, and there is no need to consider the influence of the transformer air gap size and the air gap medium on the signal transmission; by changing the load on the first impedance matching circuit and the second impedance matching circuit of the transformer, the voltage and current in the transformer power transmission system are changed, and the signal transmission is completed. Different from the carrier communication method, there is no need to additionally power the switching circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following drawings are only used to illustrate and explain the present invention, and are not used to limit the scope of the present invention, wherein:

[0020] Figure 1 : A schematic diagram of the structure of the transformer communication system of the rotary guide tool based on load changes of the present invention;

[0021] Figure 2 : Schematic diagram of the transformer structure of the present invention;

[0022] Figure 3 : Schematic diagram of the structure of the first impedance matching circuit and the second impedance matching circuit of the present invention;

[0023] In the figure: 1-primary coil, 2-secondary coil, 3-main power inverter, 4-load, 5-upper computer, 6-lower computer. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution, design method and advantages of the present invention clearer, the present invention is further described in detail by specific embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] like Figure 1 As shown, the present invention provides a transformer communication system for a rotary steering tool based on load changes,

[0026] Including transformer;

[0027] A primary circuit is provided at one end of the transformer, and a secondary circuit is provided at the other end of the transformer; the primary coil 1 of the transformer and the main power inverter 3 constitute the primary circuit, a first communication load is connected in parallel at both ends of the main power inverter 3, and the first communication load is connected to a communication circuit board A on a fixed component of a rotary guide tool, which is used to modulate the communication circuit board A into a control carrier signal to control the voltage and current signals on the first communication load;

[0028] The main power inverter 3 is connected to a DC power supply, and the secondary coil 2 of the transformer and the load 4 constitute the secondary circuit. A second communication load is connected in parallel at both ends of the load 4 via a rectifier circuit, wherein the rectifier circuit is used to convert AC power into DC power; the second communication load is connected to a communication circuit board B on the rotating part of the rotary guide tool, which is used to receive the voltage and current signals on the primary circuit of the circuit through magnetic coupling so that the voltage and current signals on the secondary circuit follow the changes, and the voltage and current signals on the primary circuit are filtered, detected, amplified, and demodulated to obtain the voltage and current signals on the primary circuit, thereby completing the bidirectional transmission of data on the primary circuit and the secondary circuit at both ends of the transformer.

[0029] It should be noted that the switch device Q1 is connected in series to the first impedance matching circuit and the switch device Q2 is connected in series to the second impedance matching circuit; it provides a fixed load, so that when the switch device Q1 is turned on, the change of the load on the first impedance matching circuit at one end of the transformer affects the change of the voltage and current on the second impedance matching circuit at the other end of the transformer, and the signal transmission is completed at the same time; if the switch device Q1 is modulated by the signal and continuously turned on and off at the communication frequency, a voltage and current signal at a single communication frequency will be formed at both ends of the transformer, and the filter and detector using the communication frequency can pick up the signal;

[0030] Further, the communication circuit board A includes a control circuit, and the first communication load includes a switch device Q1 and a first impedance matching circuit connected in series;

[0031] The control circuit is connected with a switch device Q1 and a first impedance matching circuit; the switch device Q1 is used to control the on / off of the load of the first impedance matching circuit through the control circuit; the series-connected switch device Q1 and the first impedance matching circuit are connected in parallel at both ends of the primary coil 1 of the transformer, so as to change the voltage and current at the end of the primary coil 1 of the transformer;

[0032] The communication circuit board B includes a receiving circuit, and the second communication load includes a switch device Q2 and a second impedance matching circuit connected in series;

[0033] The receiving circuit is connected to a switch device Q2 and a second impedance matching circuit. The switch device Q2 controls the on / off of the load on the second impedance matching circuit through the receiving circuit. The series-connected switch device Q2 and the second impedance matching circuit are connected in parallel at both ends of the transformer secondary coil 2, so as to make the voltage and current at the end of the transformer secondary coil 2 follow the changes.

[0034] Furthermore, the control circuit includes a host computer 5, to which a signal sampling circuit A, a modulator A and a demodulator A are connected; and the signal sampling circuit A and the modulator A are also connected to the switching device Q1, for collecting data on the main power inverter 3 through the signal sampling circuit A, modulating the data into a control carrier signal through the modulator A, and sending it to the switching device Q1. The switching device Q1 controls the on and off of the first impedance matching circuit according to the control carrier signal, so as to generate voltage and current signals in the primary circuit.

[0035] Furthermore, the receiving circuit includes a lower computer 6, to which a signal sampler B, a signal modulator B and a signal demodulator B are connected, and the signal sampler B and the signal modulator B are also connected to the switching device Q2; it is used to collect the voltage and current signals on the primary circuit through the signal sampler B, and send them to the secondary circuit through the switching device Q2 and the second impedance matching circuit. The secondary circuit is filtered, detected, amplified and demodulated by the signal modulator B and the signal demodulator B to obtain the voltage and current signals on the primary circuit.

[0036] Furthermore, the first impedance matching circuit and the second impedance matching circuit are both composed of a resistor R0, a capacitor Cs, and an inductor Ls which are sequentially connected in series, and a capacitor Cp is connected in parallel at both ends of the inductor Ls.

[0037] Further, the impedances of the first impedance matching circuit and the second impedance matching circuit at the modulation frequency F1 are both Z1, the impedance of the main power inverter 3 at the frequency F0 is Z0, the frequency F1 is greater than the frequency F0, and the impedance Z1 is less than the impedance Z0. ;

[0038] It should be noted that the impedance of the first impedance matching circuit and the second impedance matching circuit at the signal modulator frequency F1 is Z1, the impedance of the main power inverter at the frequency F0 is Z0, the frequency F1 is greater than the frequency F0, and the impedance Z1 is less than the impedance Z0; the current I passing through the load of the first impedance matching circuit and the second impedance matching circuit can be adjusted by adjusting the size of Z1, and the current will cause a voltage drop at both ends of the primary and secondary of the transformer when the signal is transmitted. The current I does not exceed the current that the switching device Q1 and the switching device Q2 and the first impedance matching circuit and the second impedance matching circuit can withstand. Since the impedance Z1 is less than the impedance Z0, the voltage drop is within the adjustable range of the power rectifier;

[0039] like Figure 1 As shown, the transformer wireless communication system of the present invention includes a transformer, a switch device Q1, a switch device Q2, a modulator A, a signal modulator B, a signal sampling circuit A, a signal sampler B, a demodulator A, a signal demodulator B, a host computer, and a slave computer.

[0040] The power processing circuit is used to rectify and filter the electric energy generated by the generator, convert it into DC power with unstable voltage, and transmit it to the DC-DC switching power supply. The power rectification and filtering circuit is placed after the mud generator to process the three-phase AC power generated by the generator. Since the speed of the mud generator is low, the frequency is low. After passing through the rectification and filtering circuit, the output voltage is 45-150V DC power. The power of the mud generator is related to the mud displacement, temperature and pressure in the well; the power range of the mud generator is 90W-300W, and the speed of the mud generator is 1500RPM-5000RPM.

[0041] It is worth noting that the present application utilizes the load changes on the first impedance matching circuit and the second impedance matching circuit at both ends of the transformer to cause the voltage and current changes in the transformer power transmission system, completes the power transmission at both ends of the transformer and performs communication transmission at the same time, and the signal transmission on the primary circuit and the secondary circuit at both ends of the transformer is transmitted through magnetic coupling. The power transmission at both ends of the transformer performs communication transmission at the same time, and there is no need to consider the influence of the transformer air gap size and the air gap medium on the signal transmission;

[0042] By changing the load on the first impedance matching circuit and the second impedance matching circuit of the transformer, the voltage and current in the transformer power transmission system are changed, and the signal transmission is completed. Unlike the carrier communication method, there is no need to additionally power the switching circuit. Compared with the prior art solution, the present invention reduces the size of components and circuits in the communication system, and can achieve multi-channel full-duplex communication by setting multiple communication frequencies.

[0043] It is worth noting that, first, the voltage and current signals are generated by the load changes at both ends of the transformer, and the transformer power transmission is transmitted by magnetic coupling, which improves the signal transmission efficiency; there is no need to consider the influence of the transformer air gap size and the air gap medium on the signal transmission;

[0044] The communication system performs communication transmission while the transformer transmits power. There is no need to consider powering the signal switch device Q1 and the switch device Q2 in the circuit, which reduces the number and size of circuit elements. By changing the load at both ends of the transformer, the voltage and current in the transformer power transmission system change, and the signal transmission is completed. Different from the carrier communication method, there is no need to additionally power the switch circuit switch device Q1 and the switch device Q2. Multi-channel full-duplex communication can be achieved by setting a variety of communication frequencies. The switch device Q1 and the switch device Q2 are existing technologies. The switch device Q1 and the switch device Q2 are both transmitting circuits in the existing technology and are both controlled switches. The switch device Q1 and the switch device Q2 are composed of MOSFET, triode, current, and voltage controlled switch devices (even relays). They are continuously turned on and off at the communication frequency under signal modulation, and must work at the maximum frequency modulated by the modulator.

[0045] Third, the communication system can directly use the current and voltage sampling circuits in the circuit to sample the signal, reducing the number and size of circuit components; the current and voltage sampling circuits are prior art circuits used to collect voltage and current signals in the circuit; the communication system directly uses the current and voltage sampling circuits in the circuit to sample the signal, reducing the number and size of circuit components in the communication system;

[0046] Fourth, the communication system is suitable for transformer and rotary transformer communication; the communication system is contactless half-duplex communication.

[0047] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A transformer communication system for a rotary steerable tool based on load changes, characterized in that: Including transformer; A primary circuit is provided at one end of the transformer, and a secondary circuit is provided at the other end of the transformer; The primary coil of the transformer and the main power inverter constitute the primary circuit, a first communication load is connected in parallel at both ends of the main power inverter, and the first communication load is connected to a communication circuit board A on a fixed component of a rotary guide tool, which is used to modulate the control carrier signal through the communication circuit board A to control the voltage and current signals on the first communication load; The main power inverter is connected to a DC power supply, and the secondary coil of the transformer and the load constitute the secondary circuit. A second communication load is connected in parallel at both ends of the load through a rectifier circuit. The second communication load is connected to a communication circuit board B on the rotating part of the rotary guide tool, which is used to receive the voltage and current signals on the primary circuit of the circuit through magnetic coupling so that the voltage and current signals on the secondary circuit follow the changes, and the voltage and current signals on the primary circuit are obtained after filtering, detecting, amplifying and demodulating. At this point, the bidirectional transmission of data on the primary circuit and the secondary circuit at both ends of the transformer is completed.

2. A transformer communication system for a rotary steering tool based on load changes according to claim 1, characterized in that: The communication circuit board A includes a control circuit, and the first communication load includes a switch device Q1 and a first impedance matching circuit connected in series; The control circuit is connected with a switch device Q1 and a first impedance matching circuit; the switch device Q1 is used to control the on / off of the load of the first impedance matching circuit through the control circuit; the series-connected switch device Q1 and the first impedance matching circuit are connected in parallel at both ends of the primary coil of the transformer, so as to change the voltage and current at the primary coil end of the transformer; The communication circuit board B includes a receiving circuit, and the second communication load includes a switch device Q2 and a second impedance matching circuit connected in series; The receiving circuit is connected to a switch device Q2 and a second impedance matching circuit. The switch device Q2 controls the on / off of the load on the second impedance matching circuit through the receiving circuit. The series-connected switch device Q2 and the second impedance matching circuit are connected in parallel at both ends of the secondary coil of the transformer, so as to make the voltage and current at the secondary coil end of the transformer follow the changes.

3. A transformer communication system for a rotary steering tool based on load changes according to claim 2, characterized in that: The control circuit includes a host computer, to which a signal sampling circuit A, a modulator A and a demodulator A are connected; and the signal sampling circuit A and the modulator A are also connected to the switching device Q1, for collecting data on the main power inverter through the signal sampling circuit A, modulating the data into a control carrier signal through the modulator A, and sending it to the switching device Q1. The switching device Q1 controls the on and off of the first impedance matching circuit according to the control carrier signal, so as to generate voltage and current signals in the primary circuit.

4. A transformer communication system for a rotary steering tool based on load changes according to claim 3, characterized in that: The receiving circuit includes a lower computer, which is connected to a signal sampler B, a signal modulator B and a signal demodulator B, and the signal sampler B and the signal modulator B are also connected to the switch device Q2; it is used to collect the voltage and current signals on the primary circuit through the signal sampler B, and send them to the secondary circuit through the switch device Q2 and the second impedance matching circuit. The secondary circuit is filtered, detected, amplified and demodulated by the signal modulator B and the signal demodulator B to obtain the voltage and current signals on the primary circuit.

5. A transformer communication system for a rotary steering tool based on load changes according to claim 4, characterized in that: The first impedance matching circuit and the second impedance matching circuit are both composed of a resistor R0, a capacitor Cs, and an inductor Ls connected in series in sequence, and a capacitor Cp is connected in parallel at both ends of the inductor Ls.

6. A transformer communication system for a rotary steering tool based on load changes according to claim 5, characterized in that: The impedances of the first impedance matching circuit and the second impedance matching circuit at the modulation frequency F1 are both Z1, the impedance of the main power inverter at the frequency F0 is Z0, the frequency F1 is greater than the frequency F0, and the impedance Z1 is less than the impedance Z0.

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