Oil and gas remote control terminal box structure

Abstract

This utility model relates to the field of terminal box technology, specifically the structure of an oil and gas remote transmission control terminal box, including a filter circuit for filtering electromagnetic interference from the power supply current and providing stable current for subsequent circuits; a transformer circuit for adjusting the power supply voltage to a suitable voltage for stepper motor RL1 and load RL2; this utility model suppresses common-mode electromagnetic interference signals in the power supply line by connecting a common-mode inductor L with two windings in parallel across the power supply, preventing it from being conducted in the power supply line and also preventing common-mode interference generated by the equipment itself from entering the power grid; at the same time, filter capacitors C1 and C5 are set to suppress interference signals between the two power supply lines, reducing the impact of differential-mode interference on the circuit; filter capacitors C6 and C7 can suppress common-mode interference signals and bypass common-mode interference current to ground, thereby improving the anti-interference capability of the control circuit and ensuring the accuracy of the stepper motor operation.

Description

Technical Field

[0001] This utility model relates to the field of terminal box technology, and in particular to the structure of oil and gas remote transmission control terminal box. Background Technology

[0002] In oil and gas field production and automation control scenarios, traditional systems often rely on manual control or local automated equipment for monitoring and regulation, which suffers from drawbacks such as slow response, high safety risks, and unstable communication. Especially in remote or dangerous areas, manual operation is inefficient and carries high risks. In recent years, the combination of 4G communication, MQTT protocol, and RS485 bus control has become mainstream, although some systems have integrated DTU communication, Modbus protocol, and remote command control functions.

[0003] The closest solution to this invention is a remote data acquisition system based on RS485 communication. Its core uses an STC8A series microcontroller as the main control chip and employs the Modbus RTU protocol to establish communication connections with multiple environmental sensors (such as temperature, humidity, atmospheric pressure, light intensity, and soil moisture) equipped with RS485 interfaces via a TTL-RS485 conversion module, enabling data acquisition and processing. The system includes a LoRa wireless transparent transmission module for short-range communication between nodes and a 4G DTU module to upload data to a remote cloud platform. The main implementation involves the microcontroller periodically sending Modbus query frames to each sensor, receiving response frames, parsing the data, and displaying and reporting the data via a serial port screen or DTU. Furthermore, this solution also includes a serial port screen for local human-machine interaction and display; the system interacts with the screen via serial port drive. This system uses stepper motors to drive valves, regulate flow and pressure, and achieve remote automated management.

[0004] However, the circuit controlling the stepper motor in this system has weak electromagnetic interference resistance and is easily affected by external electromagnetic interference, which can lead to untimely circuit switching and reduce the accuracy of the stepper motor. Utility Model Content

[0005] The main purpose of this utility model is to provide a structure for a remote control terminal box for oil and gas transmission in order to solve the problems raised in related technologies.

[0006] To achieve the above objectives, according to one aspect of the present invention, an oil and gas remote transmission control terminal box structure is provided, including a control circuit for controlling the on / off state of a stepper motor, the control circuit comprising:

[0007] A filter circuit is used to filter electromagnetic interference from the power supply current and provide a stable current for subsequent circuits.

[0008] A transformer circuit is used to adjust the power supply voltage to a voltage suitable for the stepper motor RL1 and the load RL2.

[0009] A sampling circuit is used to detect the current in the transformer circuit and control the switching on and off of the transformer circuit.

[0010] A voltage regulator circuit is used to stabilize the output voltage of the transformer circuit.

[0011] Furthermore, the filtering circuit includes a common-mode inductor L, a filter capacitor C1, a filter capacitor C5, a filter capacitor C6, and a filter capacitor C7. The common-mode inductor L is connected in series between the power phase line ACL and the power neutral line CAN. The filter capacitor C1 is connected in parallel across the two ends of the input power supply and is connected across the line between the common-mode inductor L and the power phase line ACL. The filter capacitors C5, C6, and C7 are all connected in parallel across the line between the common-mode inductor L and the power neutral line ACN.

[0012] Furthermore, the filter capacitor C5 is connected across the power phase line ACL and the power neutral line CAN to filter out differential mode interference. The filter capacitor C6 is connected between the power phase line ACL and the ground line. The filter capacitor C7 is connected between the power neutral line CAN and the ground line. Both the filter capacitors C6 and C7 are used to filter out common mode interference.

[0013] Furthermore, the sampling circuit includes a pulse width modulation controller IC1, an energy storage capacitor C2, a rectifier diode D3, a switching transistor Q, and a sampling resistor Rs. The energy storage capacitor C2 is connected in series across the power supply. The pulse width modulation controller IC1 is connected in parallel with the energy storage capacitor C2. The signal output pin of the pulse width modulation controller IC1 is connected to the gate of the switching transistor Q. The current sampling pin of the pulse width modulation controller IC1 is connected to the sampling resistor Rs, which is grounded. The drain of the switching transistor Q is connected to the rectifier diode D3, and the source of the switching transistor Q is connected to the sampling resistor Rs. The cathode of the rectifier diode D3 is connected to the power supply pin of the pulse width modulation controller IC1.

[0014] Furthermore, the transformer circuit includes an optocoupler IC2, a Zener diode DZ, and a resistor R. The resistor R is connected to the anode of the light-emitting diode inside the optocoupler IC2, the cathode of the Zener diode DZ is connected to the cathode of the light-emitting diode inside the optocoupler IC2, and the anode of the Zener diode DZ is grounded.

[0015] Furthermore, the transformer circuit includes a stepper motor circuit and a load circuit.

[0016] Furthermore, the stepper motor circuit includes a primary winding Np, a secondary winding NS1, a diode D1, a filter capacitor C3, and a stepper motor RL1. The load circuit includes an auxiliary winding Nb, a secondary winding NS2, a diode D2, a filter capacitor C4, and a load RL2. The secondary winding NS1, the secondary winding NS2, the primary winding Np, and the auxiliary winding Nb form a transformer TR.

[0017] Furthermore, one end of the primary winding Np is connected to the drain of the switching transistor Q, and the other end is connected to the positive terminal of the energy storage capacitor C2. One end of the auxiliary winding Nb is connected to the anode of the rectifier diode D3, and the other end is grounded. One end of the secondary winding NS1 is connected to the anode of the diode D1, and the other end is grounded. One end of the secondary winding NS2 is connected to the anode of the diode D2, and the other end is grounded.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This invention suppresses common-mode electromagnetic interference signals in the power supply line by connecting a common-mode inductor L with two windings in parallel across the power supply, preventing it from being conducted in the power supply line and also preventing common-mode interference generated by the device itself from entering the power grid. At the same time, filter capacitors C1 and C5 are set to suppress interference signals between the two power supply lines, reducing the impact of differential-mode interference on the circuit. Filter capacitors C6 and C7 can suppress common-mode interference signals and bypass common-mode interference current to ground, thereby improving the anti-interference capability of the control circuit and ensuring the accuracy of the stepper motor operation. Attached Figure Description

[0020] Figure 1 This is the circuit diagram of this utility model. Detailed Implementation

[0021] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0022] This embodiment provides a structure for an oil and gas remote transmission control terminal box, such as... Figure 1 As shown, a control circuit for controlling the on / off state of a stepper motor is included. The control circuit includes:

[0023] The filter circuit is used to filter out electromagnetic interference from the power supply current and provide a stable current for subsequent circuits.

[0024] The transformer circuit is used to adjust the power supply voltage to a voltage suitable for the stepper motor RL1 and the load RL2.

[0025] The sampling circuit is used to detect the current in the transformer circuit and control the switching on and off of the transformer circuit.

[0026] A voltage regulator circuit is used to stabilize the output voltage of a transformer circuit.

[0027] The filtering circuit includes a common-mode inductor L, filter capacitors C1, C5, C6, and C7. The common-mode inductor L is connected in series between the power phase line ACL and the power neutral line CAN. The filter capacitor C1 is connected in parallel across the two ends of the input power supply and is also connected across the line between the common-mode inductor L and the power phase line ACL. The filter capacitors C5, C6, and C7 are all connected in parallel between the common-mode inductor L and the power neutral line ACN.

[0028] Filter capacitor C5 is connected across the power phase line ACL and the power neutral line CAN to filter out differential mode interference. Filter capacitor C6 is connected between the power phase line ACL and the ground line. Filter capacitor C7 is connected between the power neutral line CAN and the ground line. Both filter capacitors C6 and C7 are used to filter out common mode interference.

[0029] The common-mode inductor L has two windings, which can present high impedance to common-mode interference signals, suppress common-mode electromagnetic interference signals present in the power line, prevent them from being conducted in the power line, and also prevent common-mode interference generated by the equipment itself from entering the power grid; filter capacitors C1 and C5 suppress interference signals between the two power lines, reducing the impact of differential-mode interference on the circuit; filter capacitors C6 and C7 can further suppress common-mode interference signals and bypass common-mode interference current to ground, thereby improving the anti-interference capability of the control circuit.

[0030] The sampling circuit includes a pulse width modulation controller IC1, an energy storage capacitor C2, a rectifier diode D3, a switching transistor Q, and a sampling resistor Rs. The energy storage capacitor C2 is connected in series across the power supply. The pulse width modulation controller IC1 is connected in parallel with the energy storage capacitor C2. The signal output pin of the pulse width modulation controller IC1 is connected to the gate of the switching transistor Q. The current sampling pin of the pulse width modulation controller IC1 is connected to the sampling resistor Rs, which is grounded. The drain of the switching transistor Q is connected to the rectifier diode D3, and the source of the switching transistor Q is connected to the sampling resistor Rs. The cathode of the rectifier diode D3 is connected to the power supply pin of the pulse width modulation controller IC1.

[0031] The pulse width modulation controller IC1 generates a pulse width modulation signal and adjusts the duty cycle according to the feedback signal to control the on and off times of the switching transistor Q, thereby stabilizing the output voltage. When the switching transistor Q is on, the primary winding Np stores energy; when it is off, the energy stored in the transformer TR is transferred to the secondary windings NS1 and NS2. The sampling resistor Rs detects the current of the switching transistor Q and converts the current signal into a voltage signal, which is fed back to the pulse width modulation controller IC1 for overcurrent protection and participation in the control loop regulation.

[0032] The transformer circuit includes an optocoupler IC2, a Zener diode DZ, and a resistor R. Resistor R is connected to the anode of the LED inside the optocoupler IC2, and the cathode of the Zener diode DZ is connected to the cathode of the LED inside the optocoupler IC2. The anode of the Zener diode DZ is grounded. The phototransistor inside the optocoupler IC2 is connected to the feedback voltage input pin of the pulse width modulation controller IC1.

[0033] The transformer circuit includes a stepper motor circuit and a load circuit.

[0034] The stepper motor circuit includes a primary winding Np, a secondary winding NS1, a diode D1, a filter capacitor C3, and a stepper motor RL1. The load circuit includes an auxiliary winding Nb, a secondary winding NS2, a diode D2, a filter capacitor C4, and a load RL2. The secondary winding NS1, the secondary winding NS2, the primary winding Np, and the auxiliary winding Nb form a transformer TR.

[0035] One end of the primary winding Np is connected to the drain of the switching transistor Q, and the other end is connected to the positive terminal of the energy storage capacitor C2. One end of the auxiliary winding Nb is connected to the anode of the rectifier diode D3, and the other end is grounded. One end of the secondary winding NS1 is connected to the anode of the diode D1, and the other end is grounded. One end of the secondary winding NS2 is connected to the anode of the diode D2, and the other end is grounded.

[0036] The transformer TR achieves energy transfer and voltage transformation from the primary to the secondary winding through electromagnetic induction, while providing electrical isolation; the primary winding Np stores and releases energy; the secondary windings NS1 and NS2 induce electromotive force, which, after rectification and filtering, provides the required DC voltage for the stepper motor RL1 and the load RL2; the auxiliary winding Nb, after rectification by the rectifier diode D3, provides the operating power for the pulse width modulation controller IC1.

[0037] Diodes D1 and D2 rectify the alternating voltages output from the secondary windings NS1 and NS2, respectively, converting the alternating current into DC voltages Uo1 and Uo2.

[0038] Filter capacitors C3 and C4 work in conjunction with diodes D1 and D2 respectively to smooth the rectified voltage, filter out ripple, and provide a stable voltage for stepper motor RL1 and load RL2.

[0039] Zener diode DZ, utilizing its voltage regulation characteristics, works in conjunction with resistor R to convert output voltage changes into current or voltage signal changes, samples the output voltage, and feeds it back to optocoupler IC2. Optocoupler IC2 provides electrical isolation, transmitting the output voltage feedback signal from the voltage regulator circuit to pulse width modulation controller IC1. The internal LED of optocoupler IC2 changes its luminous intensity according to the input signal, and the phototransistor receives the light signal and converts it into an electrical signal, feeding it back to pulse width modulation controller IC1. This causes pulse width modulation controller IC1 to adjust the output pulse duty cycle according to the feedback signal, maintaining a stable output voltage. Rectifier diode D3 rectifies the output of auxiliary winding Nb, providing a stable operating power supply for the transformer circuit.

[0040] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A remote control terminal box structure for oil and gas transmission, comprising a control circuit for controlling the on / off state of a stepper motor, characterized in that, The control circuit includes: A filter circuit is used to filter electromagnetic interference from the power supply current and provide a stable current for subsequent circuits. A transformer circuit is used to adjust the power supply voltage to a voltage suitable for the stepper motor RL1 and the load RL2. A sampling circuit is used to detect the current in the transformer circuit and control the switching on and off of the transformer circuit. A voltage regulator circuit is used to stabilize the output voltage of the transformer circuit. The filtering circuit includes a common-mode inductor L, a filter capacitor C1, a filter capacitor C5, a filter capacitor C6, and a filter capacitor C7. The common-mode inductor L is connected in series between the power phase line ACL and the power neutral line CAN. The filter capacitor C1 is connected in parallel across the two ends of the input power supply and is connected across the line between the common-mode inductor L and the power phase line ACL. The filter capacitors C5, C6, and C7 are all connected in parallel between the common-mode inductor L and the power neutral line ACN.

2. The oil and gas remote transmission control terminal box structure according to claim 1, characterized in that, The filter capacitor C5 is connected between the power phase line ACL and the power neutral line CAN to filter out differential mode interference. The filter capacitor C6 is connected between the power phase line ACL and the ground line. The filter capacitor C7 is connected between the power neutral line CAN and the ground line. Both the filter capacitors C6 and C7 are used to filter out common mode interference.

3. The oil and gas remote transmission control terminal box structure according to claim 2, characterized in that, The sampling circuit includes a pulse width modulation controller IC1, an energy storage capacitor C2, a rectifier diode D3, a switching transistor Q, and a sampling resistor Rs. The energy storage capacitor C2 is connected in series across the power supply. The pulse width modulation controller IC1 is connected in parallel with the energy storage capacitor C2. The signal output pin of the pulse width modulation controller IC1 is connected to the gate of the switching transistor Q. The current sampling pin of the pulse width modulation controller IC1 is connected to the sampling resistor Rs, which is grounded. The drain of the switching transistor Q is connected to the rectifier diode D3, and the source of the switching transistor Q is connected to the sampling resistor Rs. The cathode of the rectifier diode D3 is connected to the power supply pin of the pulse width modulation controller IC1.

4. The oil and gas remote transmission control terminal box structure according to claim 3, characterized in that, The transformer circuit includes an optocoupler IC2, a Zener diode DZ, and a resistor R. The resistor R is connected to the anode of the light-emitting diode inside the optocoupler IC2, the cathode of the Zener diode DZ is connected to the cathode of the light-emitting diode inside the optocoupler IC2, and the anode of the Zener diode DZ is grounded.

5. The oil and gas remote transmission control terminal box structure according to claim 4, characterized in that, The transformer circuit includes a stepper motor circuit and a load circuit.

6. The oil and gas remote transmission control terminal box structure according to claim 5, characterized in that, The stepper motor circuit includes a primary winding Np, a secondary winding NS1, a diode D1, a filter capacitor C3, and a stepper motor RL1. The load circuit includes an auxiliary winding Nb, a secondary winding NS2, a diode D2, a filter capacitor C4, and a load RL2. The secondary winding NS1, the secondary winding NS2, the primary winding Np, and the auxiliary winding Nb form a transformer TR.

7. The oil and gas remote transmission control terminal box structure according to claim 6, characterized in that, One end of the primary winding Np is connected to the drain of the switching transistor Q, and the other end is connected to the positive terminal of the energy storage capacitor C2. One end of the auxiliary winding Nb is connected to the anode of the rectifier diode D3, and the other end is grounded. One end of the secondary winding NS1 is connected to the anode of the diode D1, and the other end is grounded. One end of the secondary winding NS2 is connected to the anode of the diode D2, and the other end is grounded.

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