Half-duplex wireless communication power supply for rotary steering logging instrument

Abstract

The utility model discloses a half-duplex wireless communication power supply for a rotary steering logging instrument, which belongs to the technical field of half-duplex wireless communication and comprises a power transmitting circuit, a power receiving circuit, a receiving decoding circuit and a power transformer circuit. According to the half-duplex wireless communication power supply for the rotary steering logging instrument, power current is transmitted to the power receiving circuit through the power transmitting circuit by matching the first winding with the second winding, so that wireless power supply from a rotating end to a static end is realized, and signal transmission from the rotating end to the static end is realized by changing the frequency of the power current; the first NMOS is driven to be switched on and switched off through a PWMS signal, the input current of the power transmitting circuit is changed in cooperation with the power transformer circuit, wireless communication signal transmission from the static end to the rotating end is achieved, compared with an existing device, the problem that the internal space is wasted due to separate transmission of two modules is solved, and the integration level and stability are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to half duplex wireless communication technical field especially relates to a half duplex wireless communication power supply for rotary steering well logging instrument. BACKGROUND

[0002] With the development of rotary steering well logging technology, reliable wireless communication power supply system is needed to ensure the stable and efficient work of the equipment. Since the rotating part of the rotary steering well logging instrument is in high-speed rotation state and the stationary part is in static state, the two parts cannot use electrical connection, and power transmission and data communication are needed between the two parts. In the prior art, two modules are used for separate transmission. Since the internal space of the rotary steering well logging instrument is limited, the design volume of the two modules is large, which wastes the internal space of the rotary steering well logging instrument.

[0003] Therefore, the half duplex wireless communication power supply for rotary steering well logging instrument is proposed to solve the above problems. CONTENT OF THE UTILITY MODEL

[0004] The utility model discloses a half duplex wireless communication power supply for rotary steering well logging instrument is provided to solve the problem of two modules separate transmission affecting the integration in the prior art.

[0005] In order to achieve the above object, the utility model adopts the following technical scheme:

[0006] A half duplex wireless communication power supply for rotary steering well logging instrument, including, the power transmitting circuit that direct current input is changed into alternating current, the power receiving circuit that alternating current is rectified into pulse direct current, receiving decoding circuit and power transformer circuit, the power transmitting circuit is adjusted the frequency of alternating current through control chip;

[0007] The power transformer circuit includes the first winding (POWER_PRI) and the second winding (POWER_SEC) that cooperate with each other, and the first winding (POWER_PRI) is connected on the power transmitting circuit, the second winding (POWER_SEC) is connected on the power receiving circuit, and the power transmitting circuit transmits power current to the power receiving circuit through the first winding (POWER_PRI) cooperating with the second winding (POWER_SEC);

[0008] The power receiving circuit includes the bridge rectifier circuit cooperating with the second winding (POWER_SEC), the shunt on-off circuit and the load (RL), and the power current is provided to the load (RL) after filtering and voltage stabilization, and the communication signal is decoded after receiving the decoding circuit and is transmitted.

[0009] The shunt circuit comprises a shunt resistor (R_fake) and a first NMOS (Q1) connected in series, the first NMOS (Q1) is connected to a PWM_S signal line, the first NMOS (Q1) is driven to be turned on or turned off by the PWM_S signal, the power transformer circuit causes the change of the input current of the power transmitting circuit, and the reverse communication signal transmission is realized.

[0010] Preferably, the power transmitting circuit comprises a bridge inverter circuit composed of a fifth NMOS (Q5), a sixth NMOS (Q5), a seventh NMOS (Q7) and an eighth NMOS (Q8), an MCU, a current sensor and two bootstrap drive chips IR2110.

[0011] Preferably, the bridge rectifier circuit comprises a first diode (D1), a second diode (D2), a third diode (D3) and a fourth diode (D4).

[0012] Preferably, the positive electrode of the fourth diode (D4) is connected in series with a sampling resistor (R_shunt), a V_is signal line is arranged between the fourth diode (D4) and the sampling resistor (R_shunt), and the other end of the V_is signal line is connected to a receiving decoding circuit.

[0013] Preferably, the receiving decoding circuit comprises a comparator, the V_is signal line is connected to the negative input end of the comparator, and the positive input end of the comparator is connected to a 3.3V power supply.

[0014] Preferably, the positive input end of the comparator is grounded through R4, R3 is connected in series between the positive input end of the comparator and the 3.3V power supply, and R2 is connected in series between the negative input end and the output end of the comparator.

[0015] In summary, the technical effects and advantages of the utility model are as follows: the half-duplex wireless communication power supply for the rotary steering well logging instrument, the power transmitting circuit transmits power current to the power receiving circuit through the first winding (POWER_PRI) and the second winding (POWER_SEC), so that wireless power supply from the rotating end to the stationary end is realized, signal transmission from the rotating end to the stationary end is realized by changing the frequency of the power current, the first NMOS (Q1) is driven to be turned on or turned off by the PWM_S signal, the power transformer circuit causes the change of the input current of the power transmitting circuit, wireless communication signal transmission from the stationary end to the rotating end is realized, compared with the prior art, the problem of waste of internal space caused by separate transmission of two modules is avoided, the volume is small, and the integration degree is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2The utility model discloses a power transmitting circuit structure diagram in the utility model.

[0018] Figure 3 The utility model discloses a power receiving circuit structure diagram in the utility model.

[0019] Figure 4 The utility model discloses a receiving decoding circuit structure diagram in the utility model.

[0020] Figure 5 The utility model discloses a power transformer circuit structure diagram in the utility model. DETAILED DESCRIPTION

[0021] The technical scheme in the embodiments of the utility model will be apparently and completely described below with the drawings in the embodiments of the utility model, and apparently, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0022] Referring to Figure 1 A half duplex wireless communication power supply for rotary steerable well logging instrument includes power transmitting circuit that inverts direct current input into alternating current, power receiving circuit that rectifies alternating current into pulse direct current, receiving decoding circuit and power transformer circuit, and the power transmitting circuit adjusts the frequency of alternating current through control chip.

[0023] Referring to Figure 2 It should be noted that the power transmitting circuit is connected with control chip (MCU), and the frequency of alternating current of the power transmitting circuit can be controlled through the control chip, which is prior art and will not be described in detail.

[0024] Referring to Figures 1-3 The power transformer circuit includes first winding (POWER_PRI) and second winding (POWER_SEC) that cooperate with each other, the first winding (POWER_PRI) is connected on the power transmitting circuit, the second winding (POWER_SEC) is connected on the power receiving circuit, and the power transmitting circuit transmits power current to the power receiving circuit through the first winding (POWER_PRI) cooperating with the second winding (POWER_SEC).

[0025] Referring to Figure 1 , Figure 5 It should be noted that the POWER_PRI winding is installed on the rotating side, and it rotates together with the rotation, the POWER_SEI winding is installed on the stationary side, and it remains relatively stationary. They have no electrical connection, and they transmit energy through the magnetic field.

[0026] Referring to Figure 3, the power receiving circuit includes a bridge rectifier circuit matched with the second winding (POWER_SEC), an LC filter circuit composed of an inductor (L3) and a capacitor (Crec), a shunt on-off circuit, a BUCK circuit for voltage stabilization, and a load (RL), the power current is filtered by the LC filter circuit and stabilized by the BUCK circuit, and then provided to the load (RL), and the communication signal is decoded by the receiving and decoding circuit to complete the transmission. The BUCK circuit and the LC filter circuit are prior art, and will not be described in detail here.

[0027] The shunt on-off circuit includes a shunt resistor (R_fake) and a first NMOS (Q1) connected in series, the first NMOS (Q1) is connected to the PWM_S signal line, and the shunt on-off circuit is connected in parallel across the capacitor (Crec). The first NMOS (Q1) is turned on and off by the PWM_S signal, the power transformer circuit causes the input current of the power transmitting circuit to change, and the reverse communication signal transmission is realized.

[0028] The half-duplex wireless communication power supply for the rotary steering logging instrument, when transmitting power current, first converts the power input POWER_IN into alternating current through the power transmitting circuit matched with the first winding (POWER_PRI) and the second winding (POWER_SEC), and then transmits the alternating current to the power receiving circuit through the power transformer circuit. The power current is rectified into pulsed direct current, filtered by the LC filter circuit, stabilized by the BUCK circuit, and then provided to the load (RL).

[0029] When the control chip gives the correct driving signal, a square wave with a duty cycle of 50% and a frequency of F1 will be generated on the first winding (POWER_PRI). When it is necessary to rotate the lateral side to send a communication signal to the stationary side, the driving signal generated by the control chip changes the square wave frequency to F2, F1 represents digital quantity 0, and F2 represents digital quantity 1, so that the transmission of digital communication signals can be completed. At this time, the signals of F1 and F2 changing constantly will react on the V_is signal of the power receiving circuit through the coupling of the power transformer. The stationary side should also be connected with a control chip, and the V_is signal is processed by the receiving and decoding circuit, and then the F1 and F2 are converted into 0 and 1 digital signals by the stationary side control chip, so that the communication signal transmission from the rotating side to the stationary side is completed.

[0030] When it is necessary to send a communication signal from the stationary side to the rotating side, the first NMOS (Q1) is turned on and off by the PWM_S signal, the power transformer circuit causes the input current of the power transmitting circuit to change, and the control chip detects the frequency change of the current, so that the reverse communication signal transmission is realized.

[0031] Reference Figure 2, the power transmitting circuit includes a bridge inverter circuit composed of a fifth NMOS (Q5), a sixth NMOS (Q5), a seventh NMOS (Q7), and an eighth NMOS (Q8), a control chip MCU, a current sensor, and two bootstrap drive chips IR2110. POWER_IN is an input DC signal, Q5, Q6, Q7, and Q8 form a bridge inverter circuit, wherein the drive signal H5 of Q5 is exactly the same as the drive signal L8 of Q8, the drive signal L6 of Q6 is exactly the same as the drive signal H7 of Q7, they are all square waves with a duty cycle of 50% and a frequency of f, and H5 and L6 are complementary, and H7 and L8 are complementary. Since Q5 and Q7 are NMOS and cannot be directly driven, IR2110 bootstrap drive chips are needed for driving. IR2110 bootstrap drive chips are prior art, and will not be described here. H5_MCU, L6_MCU, H7_MCU, and L8_MCU can be directly given by the control chip.

[0032] Referring to Figure 3 , the bridge rectifier circuit is composed of a first diode (D1), a second diode (D2), a third diode (D3), and a fourth diode (D4), so as to convert alternating current into unidirectional pulsatile direct current.

[0033] The anode of the fourth diode (D4) is connected in series with a sampling resistor (R_shunt), and a V_is signal line is provided between the fourth diode (D4) and the sampling resistor (R_shunt), the other end of the V_is signal line being connected to a receiving decoding circuit, and F1 and F2 being converted into 0 and 1 digital signals by the stationary side control chip after the V_is signal is processed by the receiving decoding circuit.

[0034] Referring to Figure 4 , the receiving decoding circuit includes a comparator, the V_is signal line being connected to the negative input end of the comparator, and the positive input end of the comparator being connected to a 3.3V power supply. The decoding is realized by comparing the size of the V_is signal and the reference voltage through the comparator.

[0035] The positive input end of the comparator is connected to ground through R4, and R3 is connected in series between the positive input end of the comparator and the 3.3V power supply. R3 and R4 constitute a voltage divider, which provides a stable reference voltage for the positive input end of the comparator, ensuring accurate signal decoding.

[0036] R2 is connected in series between the negative input end and the output end of the comparator. R2 is a feedback resistor between the output end and the inverting input end of the operational amplifier, introducing positive feedback, so that the comparator has a hysteresis effect, which can reduce the sensitivity of the circuit to noise and prevent output instability or frequent switching due to small signal disturbances.

[0037] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A half duplex wireless communication power supply for a rotary steerable well logging instrument, characterized by, The power transmitting circuit includes a power transmitting circuit, a power receiving circuit, a receiving decoding circuit and a power transformer circuit, the power transmitting circuit converts DC into AC, and the frequency of AC is adjusted by a control chip; The power transformer circuit includes a first winding and a second winding, the first winding is connected to the power transmitting circuit, and the second winding is connected to the power receiving circuit, the power transmitting circuit transmits power current to the power receiving circuit through the first winding and the second winding; The power receiving circuit includes a bridge rectifier circuit, a shunt circuit and a load, the power current is filtered and stabilized to provide the load, and the communication signal is decoded by the receiving decoding circuit to complete transmission; The shunt circuit includes a shunt resistor and a first NMOS, the first NMOS is connected to a PWM_S signal line, the first NMOS is driven by the PWM_S signal to be turned on and turned off, the power transmitting circuit input current is changed through the power transformer circuit, and reverse communication signal transmission is realized.

2. A half duplex wireless communication power supply for a rotary steerable well instrument according to claim 1, characterized in that, The power transmitting circuit includes a bridge inverter circuit composed of a fifth NMOS, a sixth NMOS, a seventh NMOS and an eighth NMOS, a control chip MCU, a current sensor and two bootstrap drive chips IR2110.

3. A half duplex wireless communication power supply for a rotary steerable well instrument according to claim 1, characterized in that, The bridge rectifier circuit includes a first diode, a second diode, a third diode and a fourth diode.

4. A half duplex wireless communication power supply for a rotary steerable well instrument according to claim 3, characterized in that, The positive electrode of the fourth diode is connected in series with a sampling resistor, a V_is signal line is arranged between the fourth diode and the sampling resistor, and the other end of the V_is signal line is connected to the receiving decoding circuit.

5. A half duplex wireless communication power supply for a rotary steerable well instrument according to claim 4, wherein, The receiving decoding circuit includes a comparator, the V_is signal line is connected to the negative input end of the comparator, and the positive input end of the comparator is connected to a 3.3V power supply.

6. A half duplex wireless communication power supply for a rotary steerable well instrument according to claim 5, wherein, The positive input end of the comparator is grounded through R4, R3 is connected in series between the positive input end of the comparator and the 3.3V power supply, and R2 is connected in series between the negative input end and the output end of the comparator.

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