CN211230442U - Motor type pulser driver - Google Patents
Motor type pulser driver Download PDFInfo
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- CN211230442U CN211230442U CN201922384502.XU CN201922384502U CN211230442U CN 211230442 U CN211230442 U CN 211230442U CN 201922384502 U CN201922384502 U CN 201922384502U CN 211230442 U CN211230442 U CN 211230442U
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- brushless motor
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- logic control
- pulser
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Abstract
The utility model discloses a motor formula pulser driver, this driver are arranged in the wireless measurement while drilling appearance in oil field, specifically include: the circuit comprises a single-ended flyback isolated voltage reduction circuit, a logic control unit MCU, an MOS tube pre-drive circuit, an MOS tube bridge arm drive circuit, a current detection amplifying circuit, a tri-state gate circuit, a Hall signal filter circuit, a drive pulse detection circuit and a vibration signal detection circuit. The utility model provides a motor formula pulser driver possesses the drive hall type brushless motor and rotates, according to the current signal automatic judgement bivalve close point, the motor area load start current limiting function of gathering. The problem of high energy consumption of the pulser of the measurement while drilling instrument is solved, and the tension, the holding power and the code sending speed of the pulser are improved.
Description
Technical Field
The utility model relates to a well drilling technical field, concretely relates to motor type pulser driver.
Background
The pulser of the wireless measurement while drilling instrument is composed of a driver, an excitation coil, a pull rod, a spring, a valve head, a valve seat and the like. The motion of the small valve of the pulser drives the valve head to do linear motion after the pull rod is pulled by a magnetic field generated by the excitation coil. Due to the rather high working pressure of the circulating fluid mud during drilling. The small valve needs a large current to generate a large pulling force when the small valve is in a closed state and an additional holding force to overcome the reacting force of the slurry and the spring after the small valve is moved in place. The required electrical energy is large. In order to further reduce energy consumption, improve efficiency, improve the pulling force and the holding force of the pulser and further improve the code sending speed of the pulser, the magnet exciting coil is replaced by the brushless motor, and the driver of the motor type pulser is generated. Compared with an excitation coil type pulser, the motor type pulser is low in energy consumption, large in holding power and high in code sending speed.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a motor type pulser driver to use in the wireless measurement while drilling appearance motor type pulser in the oil field, thereby solve the problem that the measurement while drilling appearance pulser energy consumption is high, improve pulling force, the holding power and the code sending speed of pulser simultaneously.
In order to achieve the above object, the utility model provides a motor type pulser driver for among the oil field wireless measurement while drilling appearance, it includes:
the voltage reduction circuit is used for providing required power supply for the driver;
the logic control unit MCU is connected with the voltage reduction circuit and is used for controlling the operation and the signal processing of the brushless motor;
the MOS tube front driving circuit is connected with the voltage reduction circuit and used for driving the MOS tube bridge arm;
the MOS tube bridge arm driving circuit is respectively connected with the MOS tube front driving circuit and the brushless motor and is used for driving the brushless motor;
the current detection amplifying circuit is respectively connected with the brushless motor and the logic control unit MCU and is used for realizing the position detection of the pulser small valve by detecting the working current signal of the brushless motor;
the three-state gate circuit is respectively connected with the logic control unit MCU, the current detection amplifying circuit and the MOS tube front drive circuit and is used for protecting the operation of the brushless motor;
the Hall signal filter circuit is respectively connected with the brushless motor and the logic control unit MCU and is used for removing interference signals of the received Hall signals reflecting the position of the motor rotor so as to realize the phase change of the brushless motor through the logic control unit MCU;
and the drive pulse detection circuit is connected with the logic control unit MCU and is used for controlling the forward and reverse rotation states of the brushless motor.
In the motor type pulser driver, the driving pulse detection circuit is connected to the directional probe and is configured to receive a pulse signal from the directional probe.
The above-mentioned motor type pulser driver, wherein, motor type pulser driver still includes: the vibration signal detection circuit is connected with the logic control unit MCU and is used for detecting the vibration of the motor type pulser; when the vibration signal exceeds a preset threshold value, the logic control unit MCU sends a signal to the directional probe to inform the directional probe to send out a pulse signal.
In the motor type pulser driver, the voltage reduction circuit is a single-ended flyback isolated voltage reduction circuit.
In the motor type pulser driver, the single-ended flyback isolated voltage reduction circuit provides a +5V power supply for the logic control unit MCU, and simultaneously provides a +12V power supply for the MOS transistor pre-driver circuit.
In the above motor type pulser driver, the MOS transistor pre-driver circuit is a bootstrap booster circuit, and is configured to provide a required gate-source voltage for the MOS transistor bridge arm driver circuit.
Compared with the existing exciting coil type pulser technology, the beneficial effects of the utility model are that: the utility model provides a motor formula pulser driver for wireless measurement while drilling appearance has not only solved the problem that the measurement while drilling pulser energy consumption is high, but also has improved the pulling force and the holding power of pulser, and because the rotational speed ratio of motor is higher, so the code sending speed of corresponding pulser has also improved moreover.
Drawings
Fig. 1 is a schematic structural diagram of the electromechanical pulser driver of the present invention;
fig. 2A and fig. 2B are schematic diagrams of the current detection amplifying circuit according to the present invention;
FIGS. 3A, 3B, 3C and 3D are schematic diagrams of a tri-state gate circuit according to the present invention;
fig. 4A, 4B and 4C are schematic diagrams illustrating the MOS transistor pre-driver circuit (A, B, C three-phase) according to the present invention.
Detailed Description
The present invention will be further described with reference to the following embodiments, which are only used for illustrating the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1, in a preferred embodiment, the present invention provides an electromechanical pulser driver for an oil field wireless measurement while drilling apparatus, comprising: the circuit comprises a single-ended flyback isolated voltage reduction circuit 1, a logic control unit MCU2, an MOS tube pre-drive circuit 3, an MOS tube bridge arm drive circuit 4, a current detection amplifying circuit 5, a tri-state gate circuit 6, a Hall signal filter circuit 7, a drive pulse detection circuit 8 and a vibration signal detection circuit 9.
The single-ended flyback isolated voltage reduction circuit 1 is used for providing required power supply for the driver. Specifically, the single-ended flyback isolated voltage reduction circuit 1 provides a +5V power supply for the logic control unit MCU2, and provides a +12V power supply for the MOS transistor pre-driver circuit 3.
The MOS tube pre-drive circuit 3 is connected with the voltage reduction circuit 1 and used for driving the MOS tube bridge arm. Preferably, the MOS transistor pre-driver circuit 3 is a bootstrap voltage booster circuit, and is configured to provide a required gate-source voltage for the MOS transistor bridge arm driver circuit 4.
The MOS tube bridge arm driving circuit 4 is respectively connected with the MOS tube front driving circuit 3 and the brushless motor 10 and is used for driving the brushless motor 10. Specifically, the MOS transistor bridge arm driving circuit 4 is used to provide power pulses to realize the forward and reverse rotation and self-locking of the brushless motor 10, thereby controlling the reciprocating motion of the pulser small valve and the position locking in a loaded state. The driving voltage of the lower arm MOS transistor of the MOS transistor bridge arm driving circuit 4 is +12V, the driving voltage of the upper arm MOS transistor of the MOS transistor bridge arm driving circuit 4 is 12V + VCC, and the power supply voltage VCC in this embodiment is 28V.
The current detection amplifying circuit 5 is respectively connected with the brushless motor 10 and the logic control unit MCU2, and is used for realizing the position detection of the pulser small valve by detecting the working current signal of the brushless motor 10. Specifically, the current detection amplifying circuit 5 first detects the working current of the brushless motor 10, and the logic control unit MCU2 further collects the current signal and then determines the closing position of the small valve and the state of the brushless motor 10 according to the current magnitude.
The tri-state gate circuit 6 is respectively connected with the logic control unit MCU2, the current detection amplifying circuit 5 and the MOS transistor pre-driver circuit 3, and is used for protecting the operation of the brushless motor 10. Specifically, the tri-state gate 6 is used to limit the large current generated during the motor starting process, so that the current value of the brushless motor 10 is limited to the current provided by the system power supply, thereby avoiding burning the system power supply.
The hall signal filter circuit 7 is respectively connected with the brushless motor 10 and the logic control unit MCU2, and is used for removing interference signals of the received hall signals reflecting the position of the motor rotor, and further realizing phase change of the brushless motor 10 through the logic control unit MCU 2. The hall signal filter circuit 7 removes the interference signal, so that the hall position code generated by the hall sensor of the brushless motor 10 is correctly transmitted to the logic control unit MCU 2.
The driving pulse detection circuit 8 is connected to the logic control unit MCU2, and is used to control the forward and reverse rotation of the brushless motor 10. The driving pulse detection circuit 8 is connected to the directional probe at the same time, and is configured to receive a pulse signal sent by the directional probe, and the logic control unit MCU2 drives the brushless motor 10 to rotate forward and backward according to positive and negative edges of the pulse signal. The directional probe is connected with the pulser and is responsible for measuring well deviation and direction, encoding measured data and then driving the pulser to generate a mud pressure signal through a pulse signal line.
The vibration signal detection circuit 9 is connected with the logic control unit MCU2 and is used for detecting the vibration of the motor-type pulser. And when the intensity of the vibration signal is smaller than a preset threshold value, judging that the working site is in a pump-off state. When the intensity of the vibration signal exceeds a preset threshold value, the working site is judged to be in a pump-on drilling state, and at the moment, the logic control unit MCU2 provides a +5V signal for the directional probe to inform the directional probe to send out a pulse signal.
The logic control unit MCU2 is connected to the voltage step-down circuit 1, and is used to control the operation and signal processing of the brushless motor 10. The logic control unit MCU2 generates PWM pulse width signals required for the operation of the brushless motor 10. And according to the hall signal code of the brushless motor 10, the logic control unit MCU2 performs internal table look-up and then performs motor phase change.
The utility model discloses in, motor-type pulser driver is used for producing the required PWM signal of brushless motor 10 operation, thereby PWM signal drives MOS pipe bridge arm drive circuit 4 driving motor rotation behind MOS pipe leading drive circuit 3. After the brushless motor 10 rotates, the lead screw drives the small valve to do linear motion. The rotation of the brushless motor 10 requires commutation and the position information of the rotor of the brushless motor 10 is provided by hall sensors of the brushless motor 10. The hall signal reflecting the rotor position of the brushless motor 10 enters the logic control unit MCU2 after passing through the hall signal filter circuit 7. After the logic control unit MCU2 acquires the hall signals, it looks up the table to obtain the subsequent conduction combinations of the motor, and then controls the conduction of the corresponding bridge arm in the MOS transistor bridge arm driving circuit 4, thereby implementing the phase change of the brushless motor 10. The level combination of the hall signals is a group of coded information, the coded information is stored in the logic control unit MCU2, the hall signal coded information collected by the logic control unit MCU2 is compared with the coded information stored in the MCU one by one, and the comparison process is called table lookup.
After the brushless motor 10 rotates, the small valve is controlled to do linear motion between two points, and the closing and opening point positions of the small valve are determined by counting Hall signals counted by the logic control unit MCU2 or the current of the brushless motor 10. When the small valve moves to the closing point, the current of the brushless motor 10 rapidly increases. The logic control unit MCU2 collects the current signal of the brushless motor 10 through the current detection amplifying circuit 5, and when the current signal is larger than a preset value, the logic control unit MCU2 stops PWM signal output and the brushless motor 10 stops rotating. Hall signal counting is used to control the stalling of the brushless motor 10 during the opening of the small valve since the current signal does not increase rapidly. The combined code of the hall signal changes once every time the brushless motor 10 rotates by an angle, and the logic control unit MCU2 calculates the number of rotations of the motor after counting the number of changes of the hall signal. The motor stall after 92 changes are fixedly collected in the logic control unit MCU 2. The current ratio in brushless motor 10 starting process is great, but hopes in practical application not to exceed a definite value at starting current under the circumstances of keeping certain starting torque, the utility model discloses a tristate gate circuit 6 has realized aforementioned demand well. When a large current signal is generated, the input voltage of the operational amplifier is higher than the starting protection voltage, and then a current limiting signal is sent out. The current limiting signal is connected to the enable terminal of the tri-state gate, and the tri-state gate 6 is in a high-impedance state when the enable terminal is at a high level, thereby rapidly cutting off the output of the PWM signal. The current of the brushless motor 10 is rapidly reduced, the tri-state gate circuit 6 is in a conducting state when the motor current returns to be less than the protection current, and the PWM signal acts on the brushless motor 10 again.
As shown in fig. 2A-2B, the current of the brushless motor 10 passes through the current sensing resistor of 0.2 Ω to generate a voltage signal, which is connected to the resistor R43 of the current sensing amplifier circuit 5 and labeled MOTO-I. The voltage signal is amplified by 11 times after passing through an operational amplifier U9A. The amplified signal passes through a low-pass filter circuit consisting of a resistor R44, a resistor R46 and a capacitor C18, and then passes through an operational amplifier U9B voltage follower circuit, so that the load carrying capacity of the signal is further improved. One path of the voltage signal output by the operational amplifier U9B is distributed to the logic control unit MCU2, and is subjected to AD conversion for calculating the actual current value of the brushless motor 10. The other path is connected to a comparison circuit consisting of an operational amplifier U11A. The voltage divider circuit composed of the resistor R62 and the resistor R66 sets the comparison voltage at 3.77V. When the voltage of AN0 in the figure exceeds 3.77V, the operational amplifier U11A outputs a 5V high level, and the level is connected to the operational amplifier U11B through a filter circuit composed of a resistor R58, a resistor R69 and a capacitor C25.
As shown in fig. 3A-3D and fig. 4A-4C, the output signal of the op-amp U11B is connected to tristate gates U3B, U3C, U3D. When the brushless motor 10 is in an overcurrent state, that is, the detected voltage value exceeds 3.77V, the tri-state gate is in a high-resistance state, and the lower bridge arm MOS transistor of the MOS transistor bridge arm circuit is turned off. The current of the brushless motor 10 will decrease rapidly until the lower bridge arm MOS transistor of the MOS transistor bridge arm circuit is turned on when the detected voltage value is lower than 3.77V. This state is completed after a brief cycle or oscillation has occurred and the brushless motor 10 is started. If the brushless motor 10 is stalled, this state continues until a time preset by the logic control unit MCU2 internal programming is exceeded. After the time is over, the logic control unit MCU2 will close the PWM signal output and record the one-time start failure information.
To sum up, the utility model provides a motor formula pulser driver possesses the rotation of drive hall type brushless motor, judges closing point, the motor area load start current limiting function of little valve automatically according to the current signal who gathers. The problem of high energy consumption of the pulser of the measurement while drilling instrument is solved, the tension and the holding power of the pulser are improved, and the code sending speed of the corresponding pulser is also improved due to the fact that the rotating speed ratio of the motor is high.
While the present invention has been described in detail with reference to the preferred embodiments thereof, it should be understood that the above description should not be taken as limiting the present invention. Numerous modifications and alterations to the present invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be limited only by the attached claims.
Claims (6)
1. An electromechanical pulser driver for use in an oilfield wireless measurement while drilling tool, comprising:
the voltage reduction circuit is used for providing required power supply for the driver;
the logic control unit MCU is connected with the voltage reduction circuit and is used for controlling the operation and the signal processing of the brushless motor;
the MOS tube front driving circuit is connected with the voltage reduction circuit and used for driving the MOS tube bridge arm;
the MOS tube bridge arm driving circuit is respectively connected with the MOS tube front driving circuit and the brushless motor and is used for driving the brushless motor;
the current detection amplifying circuit is respectively connected with the brushless motor and the logic control unit MCU and is used for realizing the position detection of the pulser small valve by detecting the working current signal of the brushless motor;
the three-state gate circuit is respectively connected with the logic control unit MCU, the current detection amplifying circuit and the MOS tube front drive circuit and is used for protecting the operation of the brushless motor;
the Hall signal filter circuit is respectively connected with the brushless motor and the logic control unit MCU and is used for removing interference signals of the received Hall signals reflecting the position of the motor rotor so as to realize the phase change of the brushless motor through the logic control unit MCU;
and the drive pulse detection circuit is connected with the logic control unit MCU and is used for controlling the forward and reverse rotation states of the brushless motor.
2. The electromechanical pulser driver according to claim 1, wherein said drive pulse detection circuit is connected to a directional probe for receiving a pulse signal from the directional probe.
3. The electromechanical pulser driver according to claim 2, further comprising: the vibration signal detection circuit is connected with the logic control unit MCU and is used for detecting the vibration of the motor type pulser; when the vibration signal exceeds a preset threshold value, the logic control unit MCU sends a signal to the directional probe to inform the directional probe to send out a pulse signal.
4. The electromechanical pulser driver according to claim 1, wherein said buck circuit is a single-ended flyback isolated buck circuit.
5. The electromechanical pulser driver of claim 4, wherein the single-ended flyback isolated buck circuit provides +5V power for the logic control unit MCU, while providing +12V power for the MOS tube pre-driver circuit.
6. The electromechanical pulser driver according to claim 1, wherein said MOS transistors pre-driver circuit is a bootstrap boost circuit for providing a desired gate-source voltage to the MOS transistors bridge driver circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922384502.XU CN211230442U (en) | 2019-12-26 | 2019-12-26 | Motor type pulser driver |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922384502.XU CN211230442U (en) | 2019-12-26 | 2019-12-26 | Motor type pulser driver |
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| Publication Number | Publication Date |
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| CN211230442U true CN211230442U (en) | 2020-08-11 |
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| CN201922384502.XU Active CN211230442U (en) | 2019-12-26 | 2019-12-26 | Motor type pulser driver |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112671258A (en) * | 2020-12-24 | 2021-04-16 | 济南新吉纳远程测控股份有限公司 | High-temperature driver short section and control method thereof |
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2019
- 2019-12-26 CN CN201922384502.XU patent/CN211230442U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112671258A (en) * | 2020-12-24 | 2021-04-16 | 济南新吉纳远程测控股份有限公司 | High-temperature driver short section and control method thereof |
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