Proportional valve control circuit, flow control device and gas transmission system

Abstract

The present application relates to a proportional valve control circuit, a flow control device and a gas transmission system, including a voltage regulating circuit and a voltage distribution circuit, wherein the voltage regulating circuit is connected to the voltage distribution circuit and a power supply, and the voltage distribution circuit is connected to a proportional valve. The voltage regulating circuit is used to obtain an input voltage from a power supply, and output a regulated voltage to the voltage distribution circuit according to the input voltage. The voltage distribution circuit adjusts the working state based on the regulated voltage, and distributes different driving voltages to the proportional valve based on different working states. By dynamically adjusting the driving voltage distributed to the proportional valve, the current generated when the driving voltage is applied to the proportional valve is guaranteed to be stable, thereby maintaining the stability of the opening of the proportional valve. The influence of the change in the resistance value of the proportional valve on the opening of the proportional valve is reduced, and the stability of the opening of the proportional valve is improved.

Description

Technical Field

[0001] The present application relates to the field of electrical circuit technology, and in particular to a proportional valve control circuit, a flow control device and a gas transmission system. Background Art

[0002] With the development of industrial level, hydraulic systems and other liquid flow paths are widely used in various industries. In the process of liquid flow control, proportional valves are usually used as flow control valves of the flow path, and the flow rate is adjusted by controlling the opening size of the proportional valve. A proportional valve is a hydraulic valve that converts the input electrical signal into force or displacement according to the proportion, thereby continuously controlling parameters such as pressure and flow. It is a control device with excellent economic performance and practical performance.

[0003] Proportional valves are usually controlled by current. A certain voltage is applied to the proportional valve to generate a corresponding current, thereby controlling the opening of the proportional valve. However, the proportional valve accumulates heat and its temperature rises after long-term operation, and the resistance of the proportional valve increases, causing the current in the proportional valve to decrease and the opening of the proportional valve to decrease. Therefore, the proportional valve has the problem of unstable opening control in application. Summary of the invention

[0004] Based on this, it is necessary to provide a proportional valve control circuit, a flow control device and a gas transmission system that can improve the stability of the proportional valve opening in order to address the above technical problems.

[0005] In a first aspect, the present application provides a proportional valve control circuit, comprising a voltage regulating circuit and a voltage distribution circuit, wherein the voltage regulating circuit is connected to the voltage distribution circuit and a power supply, and the voltage distribution circuit is connected to a proportional valve;

[0006] The voltage regulating circuit is used to obtain an input voltage from the power supply, and output a regulated voltage to the voltage distribution circuit according to the input voltage. The voltage distribution circuit adjusts the working state based on the regulated voltage, and distributes different driving voltages to the proportional valve based on different working states.

[0007] In one embodiment, the voltage regulation circuit includes a voltage feedback circuit and a voltage divider circuit, the voltage feedback circuit and the voltage divider circuit are both connected to the power supply, and the voltage feedback circuit and the voltage divider circuit are both connected to the voltage distribution circuit;

[0008] The voltage divider circuit is used to condition the input voltage after being connected, and output the conditioned input voltage. The voltage feedback circuit outputs a feedback voltage according to the input voltage based on different working states, and determines the regulated voltage according to the feedback voltage and the conditioned input voltage, and outputs the regulated voltage to the voltage distribution circuit.

[0009] In one embodiment, the voltage feedback circuit includes a voltage regulating resistor and a voltage regulating switch tube, the first end of the voltage regulating resistor and the output end of the voltage regulating switch tube are both connected to the power supply, the second end of the voltage regulating resistor, the control end of the voltage regulating switch tube and the input end of the voltage regulating switch tube are all connected to the voltage distribution circuit, and the input end of the voltage regulating switch tube is also connected to the voltage divider circuit.

[0010] In one embodiment, the voltage-dividing circuit includes a first voltage-dividing resistor and a second voltage-dividing resistor connected in series, wherein one end of the first voltage-dividing resistor away from the second voltage-dividing resistor is connected to the power supply, one end of the second voltage-dividing resistor away from the first voltage-dividing resistor is grounded, and a common end where the first voltage-dividing resistor and the second voltage-dividing resistor are connected is connected to an input end of the voltage regulating switch tube and the voltage distribution circuit.

[0011] In one of the embodiments, the voltage regulating circuit further includes a buffer capacitor, a first end of the buffer capacitor is connected to the power supply, and a second end of the buffer capacitor is connected to a common end of the first voltage-dividing resistor and the second voltage-dividing resistor.

[0012] In one embodiment, the voltage distribution circuit includes a voltage distribution switch tube, the input end of the voltage distribution switch tube is connected to the second end of the voltage regulating resistor and the control end of the voltage regulating switch tube, the control end of the voltage distribution switch tube is connected to the input end of the voltage regulating switch tube and the voltage divider circuit, and the output end of the voltage distribution switch tube is connected to the proportional valve.

[0013] In one embodiment, the voltage distribution circuit further includes a protection circuit, a first end of the protection circuit is connected to an input end of the voltage distribution switch tube, and a second end of the protection circuit is connected to an output end of the voltage distribution switch tube.

[0014] In one embodiment, the protection circuit includes a protection resistor and a protection capacitor connected in series, wherein one end of the protection resistor away from the protection capacitor is connected to the input end of the voltage distribution switch tube, and one end of the protection capacitor away from the protection resistor is connected to the output end of the voltage distribution switch tube.

[0015] In one of the embodiments, the voltage distribution circuit further includes a voltage stabilizing element, and the voltage stabilizing element is connected to the input end of the voltage distribution switch tube and the control end of the voltage distribution switch tube.

[0016] In one embodiment, the voltage distribution circuit further includes a current limiting element, which is disposed between the voltage stabilizing element and the control end of the voltage distribution switch tube, and the voltage stabilizing element is connected to the control end of the voltage distribution switch tube through the current limiting element.

[0017] In a second aspect, the present application further provides a flow control device, which includes a power supply, a proportional valve and a proportional valve control circuit as described in the above embodiments, wherein the proportional valve control circuit connects the power supply and the proportional valve.

[0018] In a third aspect, the present application further provides a gas transmission system, which includes a gas pipeline and a flow control device as described in the above embodiment, wherein the flow control device is arranged on the gas pipeline.

[0019] The above-mentioned proportional valve control circuit, flow control device and gas transmission system include a voltage regulating circuit and a voltage distribution circuit. The voltage regulating circuit is connected to the voltage distribution circuit and the power supply, and the voltage distribution circuit is connected to the proportional valve. The voltage regulating circuit is used to obtain an input voltage from the power supply, and output a regulated voltage to the voltage distribution circuit according to the input voltage. The voltage distribution circuit adjusts the working state based on the regulated voltage, and distributes different driving voltages to the proportional valve based on different working states. By dynamically adjusting the driving voltage distributed to the proportional valve, the current generated when the driving voltage is applied to the proportional valve is guaranteed to be stable, thereby maintaining the stability of the proportional valve opening. The influence of the change in the resistance value of the proportional valve on the opening of the proportional valve is reduced, and the stability of the opening of the proportional valve is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0021] FIG1 is a block diagram of a proportional valve control circuit in one embodiment;

[0022] FIG2 is a block diagram of a proportional valve control circuit in another embodiment;

[0023] FIG3 is a circuit diagram of a voltage regulation circuit in one embodiment;

[0024] FIG4 is a circuit diagram of a voltage regulation circuit in another embodiment;

[0025] FIG5 is a circuit diagram of a voltage regulating circuit in yet another embodiment;

[0026] FIG6 is a circuit diagram of a proportional valve control circuit in one embodiment;

[0027] FIG7 is a schematic diagram of the structure of a voltage distribution circuit in one embodiment;

[0028] FIG8 is a circuit diagram of a voltage distribution circuit in one embodiment;

[0029] FIG9 is a schematic diagram of the structure of a voltage distribution circuit in another embodiment;

[0030] FIG10 is a schematic diagram of the structure of a voltage distribution circuit in yet another embodiment;

[0031] FIG. 11 is a circuit diagram of a proportional valve control circuit in another embodiment.

[0032] Explanation of the accompanying drawings: voltage regulation circuit 102, voltage distribution circuit 104, voltage feedback circuit 202, voltage dividing circuit 204, protection circuit 702, first voltage dividing resistor R1, second voltage dividing resistor R2, voltage regulation resistor R3, current limiting resistor R4, protection resistor R5, buffer capacitor C1, protection capacitor C2, voltage zener diode D1, voltage regulation switch tube Q1, voltage distribution switch tube Q2. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0034] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0035] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0036] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0038] A proportional valve is a valve widely used in pipeline flow control. By adjusting the opening of the proportional valve, the flow in the pipeline can be controlled. The proportional valve is usually controlled by electric current. According to the magnitude of the current, the electromagnetic coil of the proportional valve generates a corresponding electromagnetic force. The magnetic force is proportional to the magnitude of the current, thereby controlling the movement position of the movable part (such as a piston or valve core) in the proportional valve. For example, when the controlled current increases, the electromagnetic force generated also increases, causing the movable part to move, opening a larger fluid channel, thereby increasing the fluid flow. On the contrary, reducing the controlled current will reduce the movement amplitude of the movable part, return to the initial closed position, reduce the opening for the fluid to pass through, and reduce the flow. Therefore, the magnitude of the current is critical to the control of the proportional valve.

[0039] For example, a proportional valve is set in a water pipe network. By applying a certain voltage to the proportional valve, a certain current flows through the electromagnetic coil, and the corresponding electromagnetic force is generated to control the movement of the movable part of the proportional valve. The flow of the water pipe at the set position is adjusted with the corresponding opening, thereby controlling the flow in the water pipe network.

[0040] However, when the electromagnetic coil of the proportional valve heats up after long-term operation, the resistance value increases, which in turn causes the current in the proportional valve to decrease. As the current decreases, the electromagnetic force of the electromagnetic coil also decreases, resulting in a decrease in the opening of the proportional valve, causing the opening of the proportional valve to deviate from the set required opening, resulting in the problem of unstable control of the opening of the proportional valve. The proportional valve control circuit described in the following embodiments of the present application can control the opening of the proportional valve, and by adjusting the voltage applied to the proportional valve, ensure the stability of the current in the proportional valve, and then stabilize the opening of the proportional valve, prevent the current from decreasing due to the increase in the resistance value of the electromagnetic coil, and keep the opening stable.

[0041] In one embodiment, as shown in FIG1 , the present application provides a proportional valve control circuit, including a voltage regulating circuit 102 and a voltage distribution circuit 104, wherein the voltage regulating circuit 102 is connected to the voltage distribution circuit 104 and a power source, and the voltage distribution circuit 104 is connected to a proportional valve. The voltage regulating circuit 102 is used to obtain an input voltage from a power source, and output a regulated voltage to the voltage distribution circuit 104 according to the input voltage, and the voltage distribution circuit 104 adjusts the working state based on the regulated voltage, and distributes different driving voltages to the proportional valve based on different working states.

[0042] Specifically, the power supply can provide a stable input voltage to the proportional valve control circuit, and after adjustment by the proportional valve control circuit, it can allocate different driving voltages to the proportional valve to drive the proportional valve. Optionally, the power supply can be a battery or a constant voltage source, as long as it can provide a numerically stable input voltage.

[0043] The voltage regulating circuit 102 receives the input voltage output by the power supply, regulates the input voltage to obtain the regulated voltage, and then outputs the regulated voltage to the voltage distribution circuit 104. The voltage distribution circuit 104 is used to distribute the driving voltage obtained by the proportional valve. The proportional valve generates current based on the driving voltage, and generates an induced magnetic field based on the current size to control the proportional valve to be at a corresponding opening.

[0044] Among them, the regulating voltage will change with the change of the current of the voltage regulating circuit 102. When different regulating voltages are output to the voltage distribution circuit 104, the voltage distribution circuit 104 will be in different working states. The working state of the voltage distribution circuit 104 corresponds to the driving voltage distributed to the proportional valve, which in turn affects the current generated by the proportional valve. Since the current generated by the proportional valve is the same as the current of the voltage regulating circuit 102, the voltage regulating circuit 102 can adjust the regulating voltage according to the change of the opening of the proportional valve. In this way, the voltage regulating circuit 102, the voltage distribution circuit 104 and the proportional valve influence each other, restrict each other, and feedback each other, and can timely follow and adjust the regulating voltage and the driving voltage when the current of the proportional valve changes, and control the current stability of the proportional valve, that is, the opening stability of the proportional valve.

[0045] In this embodiment, the proportional valve control circuit includes a voltage regulating circuit 102 and a voltage distribution circuit 104, wherein the voltage regulating circuit 102 is connected to the voltage distribution circuit 104 and a power supply, and the voltage distribution circuit 104 is connected to the proportional valve. The voltage regulating circuit 102 is used to obtain an input voltage from a power supply, and output a regulated voltage to the voltage distribution circuit 104 according to the input voltage. The voltage distribution circuit 104 adjusts the working state based on the regulated voltage, and distributes different driving voltages to the proportional valve based on different working states. By dynamically adjusting the driving voltage distributed to the proportional valve, the current generated when the driving voltage is applied to the proportional valve is guaranteed to be stable, thereby maintaining the stability of the opening of the proportional valve. The influence of the change in the resistance value of the proportional valve on the opening of the proportional valve is reduced, and the stability of the opening of the proportional valve is improved.

[0046] In one exemplary embodiment, as shown in FIG2 , the voltage regulation circuit 102 includes a voltage feedback circuit 202 and a voltage divider circuit 204, both of which are connected to a power supply, and both of which are connected to the voltage distribution circuit 104. The voltage divider circuit 204 is used to adjust the input voltage after receiving it, and output the adjusted input voltage; the voltage feedback circuit 202 outputs a feedback voltage according to the input voltage based on different working states, and determines the adjustment voltage according to the feedback voltage and the adjusted input voltage, and outputs the adjustment voltage to the voltage distribution circuit 104.

[0047] Specifically, the voltage feedback circuit 202 and the voltage divider circuit 204 are connected in parallel between the power supply and the voltage distribution circuit 104, and coordinate to realize the output of the regulated voltage. The voltage divider circuit 204 is connected to the power supply, receives the input voltage, divides the input voltage, and performs preliminary conditioning to obtain a conditioned input voltage, the value of which is less than the input voltage output by the power supply.

[0048] The voltage feedback circuit 202 is connected to the conditioned input voltage output by the voltage divider circuit 204 and the input voltage of the power supply at the same time. Since the voltage feedback circuit 202 can adjust the working state according to the current of the proportional valve, obtain the feedback voltage according to different working states, and adjust the voltage received by the voltage distribution circuit 104 based on the feedback voltage and the conditioned input voltage, the regulated voltage finally output to the voltage distribution circuit 104 can be adjusted between the above two voltages according to the working state. That is, the voltage feedback circuit 202 can output the feedback voltage to the common end connected to the voltage divider circuit 204 and the voltage feedback circuit 202 according to the input voltage according to different working states. The regulated voltage is determined from the feedback voltage and the conditioned input voltage, specifically, the voltage with the larger voltage value between the feedback voltage and the conditioned input voltage is selected as the regulated voltage. In the above manner, different regulated voltages are output to the voltage distribution circuit 104.

[0049] For ease of understanding, illustratively, the working state of the voltage feedback circuit 202 may include a short-circuit state and an open-circuit state, and the working state is affected by the current of the proportional valve. When the working state of the voltage feedback circuit 202 is an open-circuit state, it is equivalent to the power supply being connected to the voltage distribution circuit 104 through the voltage divider circuit 204. At this time, the feedback voltage output by the voltage feedback circuit 202 is zero. The voltage value of the conditioned voltage after conditioning is larger among the feedback voltage and the conditioned input voltage. The determined regulated voltage is the conditioned input voltage, which is the output of the voltage divider circuit 204. When the working state of the voltage feedback circuit 202 is a short-circuit state, it is equivalent to the power supply being able to be directly connected to the voltage distribution circuit 104. At this time, the feedback voltage output by the voltage feedback circuit 202 is the input voltage. The voltage value of the feedback voltage and the conditioned input voltage is larger. The determined regulated voltage is the input voltage, which is the output of the power supply. It is understandable that this example simplifies the working state of the voltage feedback circuit 202. In practical applications, the working state of the voltage feedback circuit 202 may also include other states such as different conduction states, which is not limited in this embodiment.

[0050] Furthermore, the voltage feedback circuit 202 may be a switch that is turned on when the current is less than a certain value, or may be another circuit structure. In one exemplary embodiment, as shown in FIG3 , the voltage feedback circuit 202 includes a voltage regulating resistor R3 and a voltage regulating switch tube Q1, the first end of the voltage regulating resistor R3 and the output end of the voltage regulating switch tube Q1 are both connected to a power supply, the second end of the voltage regulating resistor R3, the control end of the voltage regulating switch tube Q1 and the input end of the voltage regulating switch tube Q1 are all connected to the voltage distribution circuit 104, and the input end of the voltage regulating switch tube Q1 is also connected to the voltage divider circuit 204.

[0051] Specifically, the first end of the voltage regulating resistor R3 is connected to the power supply, and the second end of the voltage regulating resistor R3 is connected to the voltage distribution circuit 104. As a resistor connected in series between the power supply and the proportional valve, the current on the voltage regulating resistor R3 is the same as the current in the proportional valve. The voltage regulating resistor R3 can detect the current of the proportional valve. Combined with the resistance value of the voltage regulating resistor R3 itself, a part of the voltage can be divided, that is, when the input voltage passes through the voltage regulating resistor R3, there is a certain voltage drop, and the magnitude of the voltage drop is proportional to the current.

[0052] The input end of the voltage regulating switch tube Q1 is connected to the voltage divider circuit 204 and the voltage distribution circuit 104, and the output end of the voltage regulating switch tube Q1 is connected to the power supply, that is, connected to the first end of the voltage regulating resistor R3. Then, the voltage regulating switch tube Q1 forms a route directly connected from the power supply to the voltage distribution circuit 104, and the working state of the voltage regulating switch tube Q1 can determine whether the regulated voltage obtained by the voltage distribution circuit 104 is the conditioned input voltage output by the voltage divider circuit 204, or the feedback voltage output by the voltage regulating switch tube Q1.

[0053] The working state of the voltage regulating switch tube Q1 is determined by the control end of the voltage regulating switch tube Q1. The control end of the voltage regulating switch tube Q1 is connected to the voltage distribution circuit 104, that is, the second end of the voltage regulating resistor R3, and the voltage received by the control end is the input voltage after the voltage regulating resistor R3 voltage drop. Then, when the current of the voltage regulating resistor R3 is larger, that is, the current of the proportional valve is larger, the voltage drop of the voltage regulating resistor R3 is larger, the voltage of the control end of the voltage regulating switch tube Q1 is smaller, the degree of conduction is smaller, and the output feedback voltage is smaller, until it is disconnected; when the current of the voltage regulating resistor R3 is smaller, that is, the current of the proportional valve is smaller (the heat accumulation of the proportional valve causes the resistance value to increase), the voltage drop of the voltage regulating resistor R3 is smaller, the voltage of the control end of the voltage regulating switch tube Q1 is larger, the degree of conduction is larger, and the output feedback voltage is larger, until the output input voltage is fully turned on.

[0054] It can be understood that when the proportional valve does not accumulate heat to cause the resistance to rise, the voltage regulating switch tube Q1 is in a disconnected state, and the regulated voltage at this time is the conditioned input voltage output by the voltage divider circuit 204. When the proportional valve accumulates heat to cause the resistance to rise, the voltage regulating switch tube Q1 is in a conduction state to different degrees, and outputs different feedback voltages. At this time, since the feedback voltage is usually greater than the conditioned input voltage, the regulated voltage is the feedback voltage flowing through the current regulating switch tube, and the magnitude of the feedback voltage is affected by the conduction degree of the voltage regulating switch tube Q1.

[0055] Through the above control logic, the working state of the voltage regulating switch tube Q1 is affected by the current of the proportional valve, and thus different regulating voltages are output to the voltage distribution circuit 104. Exemplarily, the voltage regulating switch tube Q1 can be an NPN transistor. It should be noted that the voltage regulating switch tube Q1 can be a switch tube with specific parameters, such as an NPN transistor whose conduction voltage is close to the input voltage of the power supply.

[0056] Taking an embodiment as an example, the input voltage of the power supply is 24V, the driving voltage required by the proportional valve is 20V under normal circumstances, and the conduction voltage of the voltage regulating switch tube Q1 can be set to 21V. Among them, the resistance of the voltage regulating switch tube Q1 can be adjusted to a resistance value that can divide the voltage by 4V, which is one-fifth of the resistance of the proportional valve under normal working conditions. When the resistance of the proportional valve increases due to heat, the current in the circuit decreases, the voltage division of the voltage regulating resistor R3 decreases, the voltage drop decreases, and the voltage at the control end of the voltage regulating switch tube Q1 increases. If it increases to 21V, the conduction condition of the voltage regulating switch tube Q1 is met, and the regulated voltage at this time is the input voltage of the power supply.

[0057] Furthermore, when the conduction degree of the voltage regulating switch tube Q1 is different, the input voltage of the power supply will be adjusted accordingly to change the regulated voltage transmitted to the voltage distribution circuit 104. This can be achieved by selecting different types of switch tubes, which will not be repeated here.

[0058] In this embodiment, the voltage regulating resistor R3 and the voltage regulating switch tube Q1 cooperate to change the working state of the proportional valve according to the current, and adjust the regulating voltage output to the voltage distribution circuit 104 according to the working state of the voltage regulating switch tube Q1, so that the voltage distribution circuit 104 is in different working states, and different driving voltages are distributed to the proportional valve, thereby ensuring the current stability of the proportional valve and improving the stability of the opening control.

[0059] In one exemplary embodiment, as shown in FIG4 , the voltage divider circuit 204 includes a first voltage divider resistor R1 and a second voltage divider resistor R2 connected in series, wherein one end of the first voltage divider resistor R1 away from the second voltage divider resistor R2 is connected to a power supply, one end of the second voltage divider resistor R2 away from the first voltage divider resistor R1 is grounded, and a common end where the first voltage divider resistor R1 and the second voltage divider resistor R2 are connected is connected to an input end of the voltage regulating switch tube Q1 and the voltage distribution circuit 104.

[0060] Specifically, the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 constitute a resistor voltage-dividing circuit, which can divide the input voltage of the power supply and output the divided voltage as the conditioned input voltage to the voltage feedback circuit 202, specifically to the input end of the voltage regulating switch tube Q1 of the voltage feedback circuit 202.

[0061] When the input voltage is U1, the voltage at the common end of the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 can be marked as U2, and the voltage-dividing circuit 204 outputs the voltage greater than the input end of the voltage regulating switch tube Q1 as U2, which is the regulated input voltage. The regulated voltage output to the voltage distribution circuit 104 is subsequently determined by the working state of the voltage regulating switch tube Q1.

[0062] Furthermore, in one exemplary embodiment, as shown in FIG5 , the voltage regulating circuit 102 further includes a buffer capacitor C1 , a first end of the buffer capacitor C1 is connected to a power supply, and a second end of the buffer capacitor C1 is connected to a common end of the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 .

[0063] Specifically, the buffer capacitor C1 is arranged between the voltage divider circuit 204 and the voltage feedback circuit 202, and the first end of the buffer capacitor C1 is connected to the power supply together with the voltage feedback circuit 202 and the voltage divider circuit 204, specifically, the first voltage divider resistor R1, the first end of the buffer capacitor C1, the output end of the voltage regulating switch tube Q1 and the first end of the voltage regulating resistor R3 are all connected to the power supply. The second end of the buffer capacitor C1 is connected to the voltage distribution circuit 104, and is also connected to the second end of the first voltage divider resistor R1 and the input end of the voltage regulating switch tube Q1. The buffer capacitor C1 can start the buffer start and prevent the circuit from oscillating, and as a buffer of the input voltage, it ensures the safety of the circuit.

[0064] In one exemplary embodiment, as shown in FIG6 , the voltage distribution circuit 104 includes a voltage distribution switch tube Q2, the input end of the voltage distribution switch tube Q2 is connected to the second end of the voltage regulating resistor R3 and the control end of the voltage regulating switch tube Q1, the control end of the voltage distribution switch tube Q2 is connected to the input end of the voltage regulating switch tube Q1 and the voltage dividing circuit 204, and the output end of the voltage distribution switch tube Q2 is connected to the proportional valve.

[0065] The input end of the voltage distribution switch tube Q2 is connected to the second end of the voltage regulating resistor R3, and the output end is connected to the proportional valve. By distributing the input voltage after the voltage drop, different driving voltages are distributed to the proportional valve according to the working state of the voltage distribution switch tube Q2, so that the proportional valve generates a corresponding current and is at a corresponding opening. Optionally, the voltage distribution switch tube Q2 can be a MOS tube, specifically an NMOS tube.

[0066] The working state of the voltage distribution switch tube Q2 is determined by the voltage of the control end of the voltage distribution switch tube Q2. The control end of the voltage distribution switch tube Q2 is connected to the input end of the voltage regulation switch tube Q1 and the voltage divider circuit 204, receives the regulated voltage output by the working state of the voltage regulation switch tube Q1, and is in different working states based on the magnitude of the regulated voltage, that is, different degrees of conduction. When the regulated voltage received by the control end of the voltage distribution switch tube Q2 is larger, the conduction degree of the voltage distribution switch tube Q2 is larger, and the driving voltage distributed to the proportional valve is larger.

[0067] The working state of the voltage regulating switch tube Q1 is regulated by the current of the proportional valve. When the conduction degree of the voltage regulating switch tube Q1 is greater, the output regulating voltage is greater, and the conduction degree of the corresponding voltage distribution switch tube Q2 is greater, and the driving voltage distributed to the proportional valve is greater.

[0068] In one exemplary embodiment, as shown in FIG. 7 , the voltage distribution circuit 104 further includes a protection circuit 702 , wherein a first end of the protection circuit 702 is connected to an input end of the voltage distribution switch tube Q2 , and a second end of the protection circuit 702 is connected to an output end of the voltage distribution switch tube Q2 .

[0069] Specifically, the protection circuit 702 is used to protect the operation of the voltage distribution switch tube Q2 to prevent the voltage or current fluctuation from affecting the distribution of the driving voltage by the voltage distribution switch tube Q2. Optionally, the protection circuit 702 may include any one or more types of components such as capacitors, resistors or inductors, and the number of components is not limited.

[0070] Exemplarily, the protection circuit 702 is an RC peak absorption circuit, which can protect the voltage distribution switch tube Q2.

[0071] Furthermore, in one exemplary embodiment, as shown in FIG8 , the protection circuit 702 includes a protection resistor R5 and a protection capacitor C2 connected in series, wherein one end of the protection resistor R5 away from the protection capacitor C2 is connected to the input end of the voltage distribution switch tube Q2, and one end of the protection capacitor C2 away from the protection resistor R5 is connected to the output end of the voltage distribution switch tube Q2.

[0072] Specifically, the protection capacitor C2 and the protection resistor R5 form an RC spike absorption circuit, also known as an RC circuit, which is composed of a capacitor and a resistor in series and connected to the two ends of the protected device. It can protect the circuit 702, reduce the loss when the circuit is turned on or off, reduce the voltage or current spikes, and ensure the safe operation of the voltage distribution switch tube Q2.

[0073] Furthermore, in one exemplary embodiment, the voltage distribution circuit 104 further includes a voltage stabilizing element, which is connected to the input end of the voltage distribution switch tube Q2 and the control end of the voltage distribution switch tube Q2. The voltage stabilizing element is used to stabilize the voltage at the control end of the voltage distribution switch tube Q2 to prevent the voltage distribution switch tube Q2 from failing.

[0074] For example, as shown in FIG9 , the voltage stabilizing element may be a voltage stabilizing diode D1, and the conduction direction of the voltage stabilizing switch tube is the direction of the input end connected to the voltage distribution switch tube Q2. The voltage stabilizing diode D1 is arranged between the input end and the control end of the voltage distribution switch tube Q2, and is used to protect the voltage distribution switch tube Q2, prevent the voltage difference between the two sections from being too large, prevent the gate voltage of the NMOS tube from exceeding the gate voltage tolerance range, and can clamp the gate voltage.

[0075] Furthermore, in one exemplary embodiment, the voltage distribution circuit 104 also includes a current limiting element, which is arranged between the voltage stabilizing element and the control end of the voltage distribution switch tube Q2, and the voltage stabilizing element is connected to the control end of the voltage distribution switch tube Q2 through the current limiting element.

[0076] The current limiting element can limit the current at the control end of the voltage distribution switch tube Q2, protecting the control end of the voltage distribution switch tube Q2 from being damaged due to excessive current. For example, as shown in FIG10 , the current limiting element is a current limiting resistor R4, which can protect the gate of the NMOS tube from being damaged by excessive current, especially at the moment when the NOS tube is turned on and off, limiting the current peak of the driving signal of its gate to prevent the NMOS tube from oscillating.

[0077] Based on the same technical concept, the present application also provides a flow control device, as shown in FIG1 , the flow control device includes a power supply, a proportional valve and a proportional valve control circuit as described in the above embodiments, and the proportional valve control circuit is connected to the power supply and the proportional valve. The power supply transmits the input voltage to the proportional valve control circuit, and the proportional valve control circuit outputs a driving voltage to the proportional valve, and the proportional valve generates a corresponding current based on the driving voltage and is at a corresponding opening.

[0078] Furthermore, the present application also provides a gas transmission system, which includes a gas pipeline and a flow control device as described in the above embodiment, and the flow control device is arranged in the gas pipeline. The flow control device can control the gas flow in the gas pipeline, and then adjust the gas intake and gas output to meet the needs of users. When the opening of the proportional valve is stable, the gas pipeline can transport gas at a constant flow rate to meet the stable demand for gas transportation.

[0079] In order to better understand the above solution, a detailed explanation is given below in conjunction with a specific embodiment.

[0080] In one embodiment, as shown in FIG11 , a flow control device in a gas transmission system includes a power supply, a proportional valve and a proportional valve control circuit, and the proportional valve control circuit includes a first voltage-dividing resistor R1, a second voltage-dividing resistor R2, a voltage-regulating resistor R3, a current-limiting resistor R4, a protective resistor R5, a buffer capacitor C1, a protective capacitor C2, a voltage-stabilizing diode D1, a voltage-regulating switch tube Q1, and a voltage-distributing switch tube Q2. The connection relationship of each component and its role in the circuit have been described above and will not be repeated here.

[0081] If the proportional valve opening is set to 50%, and the corresponding drive current is I1, then the ideal effect is that the drive current remains unchanged, the proportional valve opening remains at 50%, and the amount of gas entering remains unchanged. However, the proportional valve works internally by means of a coil, and during operation, the coil will heat up, causing the resistance to increase, thereby causing the proportional valve current to decrease.

[0082] When the current driving the proportional valve is lower than the initial value I1, the conduction degree of the voltage distribution switch tube Q2 will increase, and then the voltage applied to the proportional valve will increase. After the voltage increases, the current passing through the proportional valve will increase, thereby preventing the proportional valve current from decreasing and maintaining the opening of the proportional valve stable.

[0083] In the circuit shown above, after the input voltage U1 of the power supply is applied to the proportional valve control circuit, the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 form a voltage-dividing circuit to generate a regulated input voltage U2. This voltage drives the NMOS tube Q2 (voltage distribution switch tube Q2) through the current-limiting resistor R4, making the NMOS tube Q2 conduct, and at this time the G-level (gate) voltage is small, and the conduction degree of the NMOS tube Q2 is relatively small.

[0084] If the proportional valve control circuit is connected to the proportional valve, and the driving current I1 of the proportional valve is relatively large, then the voltage drop across the voltage regulating resistor R3 will be relatively large, and the voltage at the driving pin of the NPN transistor Q1 (voltage regulating switch tube Q1) will be relatively small, which is insufficient to drive the NPN transistor Q1 to conduct, so the NMOS tube Q2 is still in a relatively low conduction state.

[0085] When the proportional valve continues to work, the resistance of the coil increases, causing the current of the proportional valve to decrease, and the voltage drop on the voltage regulating resistor R3 gradually decreases. When the voltage of the driving pin of the NPN transistor Q1 is greater than the turn-on voltage, the NPN transistor Q1 starts to conduct.

[0086] After being turned on, the NPN transistor Q1 will apply a voltage (feedback voltage) to the G pole of the NMOS tube Q2. Since the voltage value of the feedback voltage is higher than the voltage value of U2, the G pole voltage at this time is greater than the G pole voltage when the NPN transistor Q1 is not turned on.

[0087] Among them, the smaller the current of the proportional valve, the smaller the voltage drop on the voltage regulating resistor R3, the greater the conduction degree of the NPN transistor Q1, and then the higher the G pole voltage of the NMOS tube Q2. The effect obtained is that the conduction degree of the NMOS tube Q2 increases, the voltage output to the proportional valve increases, and the current driving the proportional valve is also increased, so that the current returns to the initial value I1, allowing it to work at the initial set opening of 50%.

[0088] In this embodiment, the current entering the proportional valve is effectively controlled, and the current drop is prevented through circuit feedback. By dynamically adjusting the voltage allocated to the proportional valve, the current of the proportional valve is guaranteed to be stable, thereby maintaining the stability of the proportional valve opening. The influence of the change in the resistance value of the proportional valve on the proportional valve opening is reduced, and the stability of the proportional valve opening is improved.

[0089] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0090] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A proportional valve control circuit, characterized in that: The invention comprises a voltage regulating circuit and a voltage distribution circuit, wherein the voltage regulating circuit is connected to the voltage distribution circuit and a power supply, and the voltage distribution circuit is connected to a proportional valve; wherein the voltage regulating circuit comprises a voltage feedback circuit and a voltage dividing circuit, wherein the voltage feedback circuit and the voltage dividing circuit are both connected to the power supply, and the voltage feedback circuit and the voltage dividing circuit are both connected to the voltage distribution circuit; The voltage regulating circuit is used to obtain an input voltage from the power supply, and output a regulated voltage to the voltage distribution circuit according to the input voltage. The voltage distribution circuit adjusts the working state based on the regulated voltage, and distributes different driving voltages to the proportional valve based on different working states; wherein the voltage divider circuit is used to adjust the input voltage after being connected to it, and output the conditioned input voltage. The voltage feedback circuit outputs a feedback voltage according to the input voltage based on different working states, and determines the regulated voltage according to the feedback voltage and the conditioned input voltage, and outputs the regulated voltage to the voltage distribution circuit; the working state of the voltage feedback circuit is determined based on the current of the proportional valve; The voltage feedback circuit includes a voltage regulating resistor and a voltage regulating switch tube, the first end of the voltage regulating resistor and the output end of the voltage regulating switch tube are both connected to the power supply, the second end of the voltage regulating resistor, the control end of the voltage regulating switch tube and the input end of the voltage regulating switch tube are all connected to the voltage distribution circuit, and the input end of the voltage regulating switch tube is also connected to the voltage dividing circuit; the voltage distribution circuit includes a voltage distribution switch tube, the input end of the voltage distribution switch tube is connected to the second end of the voltage regulating resistor and the control end of the voltage regulating switch tube, the control end of the voltage distribution switch tube is connected to the input end of the voltage regulating switch tube and the voltage dividing circuit, and the output end of the voltage distribution switch tube is connected to the proportional valve.

2. The proportional valve control circuit according to claim 1, characterized in that: The voltage-dividing circuit includes a first voltage-dividing resistor and a second voltage-dividing resistor connected in series, wherein one end of the first voltage-dividing resistor away from the second voltage-dividing resistor is connected to the power supply, one end of the second voltage-dividing resistor away from the first voltage-dividing resistor is grounded, and a common end where the first voltage-dividing resistor and the second voltage-dividing resistor are connected is connected to the input end of the voltage regulating switch tube and the voltage distribution circuit.

3. The proportional valve control circuit according to claim 2, characterized in that: The voltage regulating circuit further includes a buffer capacitor, a first end of the buffer capacitor is connected to the power supply, and a second end of the buffer capacitor is connected to a common end of the first voltage dividing resistor and the second voltage dividing resistor.

4. The proportional valve control circuit according to claim 1, characterized in that: The voltage distribution circuit also includes a protection circuit, a first end of the protection circuit is connected to the input end of the voltage distribution switch tube, and a second end of the protection circuit is connected to the output end of the voltage distribution switch tube.

5. The proportional valve control circuit according to claim 4, characterized in that: The protection circuit includes a protection resistor and a protection capacitor connected in series, wherein one end of the protection resistor away from the protection capacitor is connected to the input end of the voltage distribution switch tube, and one end of the protection capacitor away from the protection resistor is connected to the output end of the voltage distribution switch tube.

6. The proportional valve control circuit according to claim 1, characterized in that: The voltage distribution circuit also includes a voltage stabilizing element, and the voltage stabilizing element is connected to the input end of the voltage distribution switch tube and the control end of the voltage distribution switch tube.

7. The proportional valve control circuit according to claim 6, characterized in that: The voltage stabilizing element is a voltage stabilizing diode.

8. The proportional valve control circuit according to claim 6, characterized in that: The voltage distribution circuit also includes a current limiting element, which is arranged between the voltage stabilizing element and the control end of the voltage distribution switch tube. The voltage stabilizing element is connected to the control end of the voltage distribution switch tube through the current limiting element.

9. The proportional valve control circuit according to claim 8, characterized in that: The current limiting element is a current limiting resistor.

10. A flow control device, characterized in that: The flow control device comprises a power supply, a proportional valve and a proportional valve control circuit as claimed in any one of claims 1 to 9, wherein the proportional valve control circuit connects the power supply and the proportional valve.

11. A gas transmission system, characterized in that: The gas transmission system comprises a gas pipeline and a flow control device as claimed in claim 10, wherein the flow control device is arranged on the gas pipeline.

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