Output-adjustable electromagnetic valve power supply system and method

Abstract

The invention discloses an output-adjustable electromagnetic valve power supply system and method, relates to the technical field of electromagnetic valve power supply, and introduces an adjustable DC / DC conversion circuit, so that various electromagnetic valves can obtain appropriate power supply, the situation that the electromagnetic valves cannot work normally due to too low power supply voltage is avoided, and the situation that energy is wasted due to too high power supply voltage is also avoided. A parameter input circuit and a parameter display circuit are introduced, so that control parameters of an electromagnetic valve power supply system can be adaptively adjusted according to user requirements, and finally electromagnetic valve driving requirements of various application scenes are met. Power supplies meeting requirements can be provided for different electromagnetic valve loads, and the requirements of various application scenes are met. For a system comprising various electromagnetic valves with different specifications, the power supply requirements of all the electromagnetic valves can be met only by using one set of power supply system, the number of spare parts of the power supply system is reduced, and the purpose of reducing the cost is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of solenoid valve power supply, and particularly to an adjustable output solenoid valve power supply system and method. Background Art

[0002] A solenoid valve is an automated component that controls fluids using electromagnetism. For a normally closed solenoid valve, when the electromagnetic coil of the solenoid valve is energized, the electromagnetic coil generates an electromagnetic attraction force. The electromagnetic attraction force overcomes the elastic force of the spring and lifts the valve core, opening the valve. When the solenoid valve coil is de-energized, the electromagnetic coil no longer generates an electromagnetic attraction force, and the closing element presses against the valve seat under the action of the spring force, closing the valve. The resistive component of the solenoid valve determines the magnitude of the solenoid valve activation current value and the solenoid valve holding current value, and the inductive component of the solenoid valve affects the speed of the conversion time. For example, the larger the inductive component of the solenoid valve, the larger the solenoid valve activation current establishment time, the conversion time from the solenoid valve activation state to the holding state, and the solenoid valve closing time will become. The solenoid valve drive current waveform is as Figure 2 shown.

[0003] Figure 2 In the figure, Imax is the solenoid valve activation current value, Imin is the solenoid valve holding current value, t1 - t2 is the solenoid valve activation current establishment time, t2 - t3 is the solenoid valve activation time, t3 - t4 is the conversion time from the solenoid valve activation state to the holding state, t4 - t n0 is the solenoid valve holding time, and t n1 -t n2 is the solenoid valve closing time.

[0004] According to different actual application requirements, it is generally recommended that the drive current of high-power solenoid valves strictly provide drive current for the solenoid valves in high and low stages as shown in the above drive current waveform diagram. For the drive current of low-power solenoid valves, a single drive current can be used without dividing into stages (because for high-power solenoid valves, due to their large own power base, if the activation current level is maintained for power supply all the time, a large amount of energy will be wasted during the stage when the solenoid valve is in the holding state. Therefore, energy must be saved as much as possible. For low-power solenoid valves, because of their small power, even if they operate in stages, not much energy will be saved).

[0005] According to different application scenarios, the impedance characteristics and requirements for drive current of solenoid valves vary widely. The impedance of solenoid valves is usually from several tens of ohms to several thousand ohms, and the required drive current ranges from several tens of milliamperes to several hundred milliamperes or even several amperes. Converted into the magnitude of the drive power, it is in the power range of several watts to over a hundred watts.

[0006] At present, a technical solution using a solenoid valve with a single impedance characteristic is usually adopted. That is, after determining the impedance characteristic and driving current characteristic of the solenoid valve, the current value required to be output by the constant current control circuit is written into the controller. The fixed output driving power supply supplies power to the entire driving circuit. The switching MOS transistor is controlled by the controller to switch between the on and off states. The constant current control circuit receives the signal conditioned by the controller and makes the driving current constant at the set value. The excess voltage is limited between the drain and source of the constant current MOS transistor in the constant current control circuit. The feedback monitoring circuit converts the analog signal into a digital signal and transmits it to the controller after collecting the voltage difference across the sampling resistor, realizing the closed-loop control of the driving current by the controller. The principle block diagram is as shown in Figure 3 shown.

[0007] It can be seen that the disadvantage of the traditional technical solution is that for the output driving power supply, both the voltage and the current are limited according to the given impedance characteristic and driving current characteristic of the solenoid valve. It has strong pertinence, single output parameters, and single application scenarios. If a solenoid valve with a significantly different impedance characteristic or driving current characteristic is used, either the solenoid valve cannot be driven normally, or the driving current greatly exceeds its rated current, resulting in damage to the solenoid valve. Summary of the Invention

[0008] In view of the above problems, the present invention provides an adjustable output solenoid valve power supply system and method for overcoming the above problems or at least partially solving the above problems. The aim is to provide a suitable driving current for various solenoid valves so that the solenoid valves can all work normally.

[0009] The present invention provides the following solutions:

[0010] An adjustable output solenoid valve power supply system, comprising:

[0011] A main controller, a fixed output driving power supply, an adjustable DC / DC conversion circuit, a parameter input circuit, a switching MOS transistor, a constant current control circuit, and a constant current MOS transistor;

[0012] The adjustable DC / DC conversion circuit, the parameter input circuit, the switching MOS transistor, and the constant current control circuit are all connected to the main controller; the fixed output driving power supply and the switching MOS transistor are both connected to the adjustable DC / DC conversion circuit; the constant current control circuit is connected to the constant current MOS transistor, and the constant current MOS transistor and the switching MOS transistor are both connected to the solenoid valve;

[0013] The adjustable DC / DC conversion circuit is used to receive the control signal sent by the main controller, so as to convert the high-voltage DC power supply from the fixed output drive power supply into the DC drive power supply required by the current solenoid valve; the control signal is obtained by the main controller through calculation based on the configuration parameters required for the solenoid valve power supply input through the parameter input circuit.

[0014] Preferably, it further includes a parameter display circuit, which is connected to the main controller; the parameter display circuit is used to display the parameter information set by the user in real time.

[0015] Preferably, the parameter display circuit includes a liquid crystal display or a digital tube display and an indicator light.

[0016] Preferably, the adjustable DC / DC conversion circuit includes a full-bridge DC / DC conversion circuit or a flyback DC / DC conversion circuit.

[0017] Preferably, the constant current control circuit includes a first digital-to-analog converter and a first operational amplifier circuit. The first digital-to-analog converter is used to output a reference voltage according to the instruction sent by the main controller, and the first operational amplifier circuit is used to condition the reference voltage to obtain the gate-source voltage required by the constant current MOS tube.

[0018] Preferably, the constant current MOS tube includes a power type N-channel field effect MOS tube.

[0019] Preferably, it further includes a feedback monitoring circuit, which is connected to the constant current MOS tube and the main controller.

[0020] Preferably, the feedback monitoring circuit includes a sampling resistor, a second operational amplifier circuit and a second analog-to-digital converter; the current of the power supply link is reflected by the voltage difference across the sampling resistor, which is conditioned by the second operational amplifier circuit to a voltage value that meets the input conditions of the analog-to-digital converter, and the analog signal collected is converted into a digital signal by the second analog-to-digital converter and sent back to the main controller.

[0021] A method for supplying power to a solenoid valve, which is applied to a small solenoid valve, and the method includes:

[0022] Connect the small solenoid valve into the loop of the above adjustable output solenoid valve power supply system;

[0023] According to the characteristic indexes of the small solenoid valve, use the parameter input circuit in combination with the parameter display circuit to input the rated voltage V and rated power P parameters of the small solenoid valve into the main controller;

[0024] The main controller converts the input rated voltage V and rated power P into impedance parameter R = V 2Save / P and the drive current parameter I = P / V;

[0025] The main controller calculates the required drive power supply voltage value V0 of the small solenoid valve according to the conditioning coefficient of the relevant conditioning circuit in the circuit and issues an instruction to make the adjustable DC / DC conversion circuit output the DC power supply voltage V0;

[0026] The main controller issues an instruction to make the current controlled by the constant current control circuit default to the current I;

[0027] The main controller controls the switch MOS transistor to conduct, a current I is generated in the power supply link, and a voltage difference ΔV is formed across the sampling resistor.

[0028] The voltage difference ΔV is uploaded to the main controller through the conditioning circuit composed of operational amplifiers and the analog-to-digital converter to achieve closed-loop control.

[0029] A solenoid valve power supply method is applied to a large solenoid valve. The method includes:

[0030] Connect the large solenoid valve to the loop of the above adjustable output solenoid valve power supply system;

[0031] According to the characteristic indexes of the large solenoid valve, the impedance parameter Z, activation current Imax, holding current Imin, and activation current duration Tmax of the solenoid valve are input into the main controller of the system through the parameter input circuit used in combination with the parameter display circuit;

[0032] The main controller calculates the required power supply voltage value V1 in the activation stage of the large solenoid valve and the required power supply voltage value V2 in the holding stage of the large solenoid valve according to the conditioning coefficient of the relevant conditioning circuit in the circuit and issues an instruction to make the adjustable DC / DC conversion circuit output the DC power supply voltage V1;

[0033] The main controller issues an instruction to make the current controlled by the constant current control circuit default to the current Imax;

[0034] The main controller controls the switch MOS transistor to conduct, a current Imax is generated in the power supply link, and a voltage difference ΔV1 is formed across the sampling resistor;

[0035] When the current in the circuit remains at the Imax level and after Tmax time, the main controller issues an instruction to adjust the output voltage of the adjustable DC / DC conversion circuit to V2, and at the same time controls the current controlled by the constant current control circuit to be the current Imin;

[0036] The current in the power supply link is Imin, and a voltage difference ΔV2 is formed across the sampling resistor;

[0037] The conditioning circuit composed of operational amplifiers and the analog-to-digital converter upload both the voltage difference ΔV1 and the voltage difference ΔV2 to the main controller, so as to achieve the closed-loop control of the main controller in the activation stage and the holding stage.

[0038] According to the specific embodiments provided by the present invention, the following technical effects are disclosed by the present invention:

[0039] An adjustable output solenoid valve power supply system and method provided by an embodiment of the present application introduce an adjustable DC / DC conversion circuit, so that various solenoid valves can obtain appropriate power supply, and the solenoid valve will not fail to work properly due to too low power supply voltage, nor will energy be wasted due to too high power supply voltage. The parameter input circuit and the parameter display circuit are introduced, so that the control parameters of the solenoid valve power supply system can be adaptively adjusted according to user needs, and finally the driving requirements of solenoid valves in various application scenarios are met. It can provide a power supply that meets the requirements for different solenoid valve loads, meeting the needs of various application scenarios. For a system containing multiple different specifications of solenoid valves, only one set of power supply system is needed to meet the power supply requirements of all solenoid valves, reducing the number of spare parts of the power supply system and achieving the purpose of cost reduction.

[0040] Of course, it is not necessary for any product implementing the present invention to achieve all the above advantages simultaneously. Brief Description of the Drawings

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0042] Figure 1 is a schematic diagram of an adjustable output solenoid valve power supply system provided by an embodiment of the present invention;

[0043] Figure 2 is a waveform diagram of the solenoid valve driving current;

[0044] Figure 3 is a schematic block diagram of a solenoid valve driving circuit in the prior art.

[0045] In the figure: main controller 1, fixed output driving power supply 2, adjustable DC / DC conversion circuit 3, parameter input circuit 4, switching MOS transistor 5, constant current control circuit 6, constant current MOS transistor 7, parameter display circuit 8, feedback monitoring circuit 9, solenoid valve 10. Detailed Embodiments

[0046] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0047] Refer to Figure 1 , which is an adjustable output solenoid valve power supply system provided by an embodiment of the present invention. As Figure 1 shown, the system may include:

[0048] A main controller 1, a fixed output drive power supply 2, an adjustable DC / DC conversion circuit 3, a parameter input circuit 4, a switching MOS transistor 5, a constant current control circuit 6, and a constant current MOS transistor 7;

[0049] The adjustable DC / DC conversion circuit 3, the parameter input circuit 4, the switching MOS transistor 5, and the constant current control circuit 6 are all connected to the main controller 1; the fixed output drive power supply 2 and the switching MOS transistor 5 are both connected to the adjustable DC / DC conversion circuit 3; the constant current control circuit 6 is connected to the constant current MOS transistor 7, and the constant current MOS transistor 7 and the switching MOS transistor 5 are both connected to the solenoid valve 10;

[0050] The adjustable DC / DC conversion circuit 3 is used to receive the control signal sent by the main controller 1, so as to convert the high-voltage DC power supply from the fixed output drive power supply 2 into the DC drive power supply required by the current solenoid valve 10; the control signal is obtained by the main controller 1 through calculation according to the configuration parameters required for the power supply of the solenoid valve 10 input through the parameter input circuit 4.

[0051] For the adjustable output solenoid valve power supply system provided by the embodiments of the present application, first, the power supply required to drive the solenoid valve 10 is adjusted from a fixed power supply to an adjustable power supply, and then the constant current parameter is also changed to an adjustable configuration. In this way, according to the characteristics of different solenoid valves 10, the parameters can be input into the main controller 1, and the main controller 1 automatically adjusts the size of the required power supply and the size of the required drive current, truly achieving the adaptive output of the solenoid valve power supply system to different solenoid valves 10.

[0052] In order to achieve intuitive display to the user when inputting parameters, the embodiments of the present application may provide a parameter display circuit 8, and the parameter display circuit 8 is connected to the main controller 1; the parameter display circuit 8 is used to display the parameter information set by the user in real time.

[0053] Further, the parameter display circuit 8 includes a liquid crystal display or a digital tube display and an indicator light.

[0054] In specific implementation, the fixed output driving power supply 2 is a high-voltage DC power supply, and its power supply range can cover the power supply range of the high-power solenoid valve 10. The main controller 1 controls the switching of the switching MOS transistor 5 by increasing the driving ability through a triode after configuring the IO port, so as to realize the conduction and cut-off of the power supply path.

[0055] The adjustable DC / DC conversion circuit 3 provided by the embodiment of the present application may include a full-bridge DC / DC conversion circuit or a flyback DC / DC conversion circuit.

[0056] The constant current control circuit 6 includes a first digital-to-analog converter and a first operational amplifier circuit. The first digital-to-analog converter is used to output a reference voltage according to an instruction issued by the main controller 1, and the first operational amplifier circuit is used to condition the reference voltage to obtain the gate-source voltage required by the constant current MOS transistor 7. The constant current control circuit 6 is mainly composed of a digital-to-analog converter, an operational amplifier, etc. The main controller 1 issues an instruction to the digital-to-analog converter to output a reference voltage, and the reference voltage is conditioned by the operational amplifier circuit to obtain the gate-source voltage required by the constant current MOS transistor 7.

[0057] The constant current MOS transistor 7 includes a power-type N-channel field-effect MOS transistor. The MOS transistor is made to work in the saturation region of the output characteristic curve. In this state, the drain current of the MOS transistor is only related to the magnitude of the gate-source voltage and is basically not affected by the change of the drain-source voltage, so as to achieve the purpose of constant current control.

[0058] Further, the embodiment of the present application may provide a feedback monitoring circuit 9, and the feedback monitoring circuit 9 is connected to the constant current MOS transistor 7 and the main controller 1. The feedback monitoring circuit 9 includes a sampling resistor, a second operational amplifier circuit, and a second analog-to-digital converter; the current of the power supply link is reflected by the voltage difference across the sampling resistor, which is conditioned by the second operational amplifier circuit to a voltage magnitude that meets the input conditions of the analog-to-digital converter, and the collected analog signal is converted into a digital signal by the second analog-to-digital converter and sent back to the main controller 1.

[0059] The feedback monitoring circuit 9 provided by the present application is mainly composed of a sampling resistor, an operational amplifier, an analog-to-digital converter, etc. The current of the power supply link is reflected by the voltage difference across the sampling resistor, and then conditioned by the operational amplifier to a voltage magnitude that meets the input conditions of the analog-to-digital converter. Finally, the collected analog signal is converted into a digital signal by the analog-to-digital converter and sent back to the main controller 1, thereby realizing the closed-loop control of the entire power supply system.

[0060] It can be seen that for the application scenario where a single solenoid valve power supply system can only supply power to one type of solenoid valve 10 or solenoid valves 10 with similar impedance characteristics, the embodiment of the present application proposes a solenoid valve power supply system with configurable output parameters, which can provide a specified driving power supply to multiple solenoid valves 10. On the one hand, the proposed solenoid valve power supply system solves the problem that the traditional solenoid valve 10 and its power supply system must be paired. When replacing the solenoid valve 10 or changing the impedance characteristics and driving current requirements of the solenoid valve, a new solenoid valve power supply system must be re-adapted. On the other hand, for some large industrial control systems that include several or even dozens of solenoid valves 10 with different sizes, powers, and large impedance differences, the adjustable output solenoid valve power supply system proposed by the present invention can well solve the above-mentioned problem of system standardization of the solenoid valve power supply system. For solenoid valves 10 of different specifications, the same power supply system can effectively supply the target driving current by configuring parameters, and can greatly reduce the number of spare parts of the solenoid valve power supply system (usually at least 1-2 same-style power supply systems should be prepared for each solenoid valve power supply system, and more should be prepared according to the actual usage quantity. If the adjustable output solenoid valve power supply system of the present invention is applied, since all solenoid valves 10 use the same solenoid valve power supply system, the number of spare parts is reduced, and the cost of the enterprise is reduced).

[0061] In summary, the adjustable output solenoid valve power supply system provided by the present application introduces an adjustable DC / DC conversion circuit, enabling various solenoid valves to obtain appropriate power supply, preventing the solenoid valve from malfunctioning due to too low power supply voltage and avoiding waste of energy due to too high power supply voltage. By introducing a parameter input circuit and a parameter display circuit, the control parameters of the solenoid valve power supply system can be adaptively adjusted according to user needs, ultimately meeting the driving requirements of solenoid valves in various application scenarios. It can provide a power supply that meets the requirements for different solenoid valve loads, meeting the needs of various application scenarios. For a system containing multiple different specifications of solenoid valves, only one set of power supply system is needed to meet the power supply requirements of all solenoid valves, reducing the number of spare parts of the power supply system and achieving the purpose of cost reduction.

[0062] Since the power supply methods for small solenoid valves and large solenoid valves are different, in actual application, different working processes can be selected according to the type of solenoid valve. For example, in one implementation, the embodiment of the present application can provide a solenoid valve power supply method applicable to small solenoid valves. The method includes:

[0063] Connect the small solenoid valve into the loop of the above-mentioned adjustable output solenoid valve power supply system;

[0064] According to the characteristic indexes of the small solenoid valve, it is used in combination with the parameter display circuit 8 through the parameter input circuit 4, and the rated voltage V and rated power P parameters of the small solenoid valve are input into the main controller 1 (usually, the indexes of the small solenoid valve include the rated voltage and the rated power);

[0065] The main controller 1 converts the input rated voltage V and rated power P into impedance parameter R = V 2 / P and drive current parameter I = P / V for storage (the small solenoid valve does not distinguish between the activation current and the holding current);

[0066] The main controller 1 calculates the required drive power supply voltage value V0 of the small solenoid valve according to the conditioning coefficient of the relevant conditioning circuit in the circuit and issues an instruction to make the adjustable DC / DC conversion circuit 3 output the DC power supply voltage V0;

[0067] The main controller 1 issues an instruction to make the current controlled by the constant current control circuit 6 default to be the current I;

[0068] The main controller 1 controls the switch MOS transistor 5 to conduct, a current I is generated in the power supply link, and a voltage difference ΔV is formed across the sampling resistor.

[0069] The voltage difference ΔV is uploaded to the main controller 1 through the conditioning circuit composed of operational amplifiers and the analog-to-digital converter to achieve closed-loop control.

[0070] In another implementation manner, the embodiment of the present application can also provide a solenoid valve power supply method, which is applied to a large solenoid valve. The method includes:

[0071] Connect the large solenoid valve into the loop of the adjustable output solenoid valve power supply system described above;

[0072] According to the characteristic indexes of the large solenoid valve, it is used in combination with the parameter display circuit 8 through the parameter input circuit 4, and the impedance parameter Z, activation current Imax, holding current Imin, and activation current duration Tmax of the solenoid valve 10 are input into the main controller 1 of the system (usually, the indexes of the large solenoid valve include the impedance parameter, activation current, holding current, and activation current duration);

[0073] The main controller 1 calculates the required power supply voltage value V1 during the activation stage of the large solenoid valve and the required power supply voltage value V2 during the holding stage of the large solenoid valve according to the conditioning coefficient of the relevant conditioning circuit in the circuit and issues an instruction to make the adjustable DC / DC conversion circuit 3 output the DC power supply voltage V1;

[0074] The main controller 1 issues an instruction to make the current controlled by the constant current control circuit 6 default to be the current Imax;

[0075] The main controller 1 controls the switch MOS transistor 5 to conduct, generating a current Imax in the power supply link and forming a voltage difference ΔV1 across the sampling resistor;

[0076] When the current in the circuit remains at the Imax level and after a time Tmax, the main controller 1 issues an instruction to adjust the output voltage of the adjustable DC / DC conversion circuit 3 to V2, and at the same time controls the current controlled by the constant current control circuit 6 to be the current Imin;

[0077] The current in the power supply link is Imin, and a voltage difference ΔV2 is formed across the sampling resistor;

[0078] The voltage differences ΔV1 and ΔV2 are both uploaded to the main controller 1 through a conditioning circuit composed of operational amplifiers and an analog-to-digital converter, so as to realize the closed-loop control of the main controller 1 in the activation stage and the holding stage.

[0079] In the system and method provided by the embodiments of the present application, an adjustable DC / DC conversion circuit, a parameter input circuit, and a parameter display circuit are introduced to achieve the purpose of adjustable output of the solenoid valve power supply system. The adjustable DC / DC conversion circuit can adopt a full-bridge DC / DC conversion circuit or a flyback DC / DC conversion circuit, and a control signal is sent by the main controller to convert the high-voltage DC power supply from a fixed-output drive power supply into the DC drive power supply required by the current solenoid valve. The parameter input circuit is composed of keys, buttons, etc., and is paired with a corresponding drive chip to realize inputting the drive current, power requirement, or impedance parameter of the required solenoid valve into the main controller. The main controller adjusts the output of the adjustable DC / DC conversion circuit and the output of the constant current control circuit according to the input parameters to meet the power supply requirements of the current solenoid valve. The parameter display circuit is mainly composed of a liquid crystal display or a digital tube display and an indicator light, which is convenient for real-time display of the parameter information set by the user, so that the user can clearly know the information of the currently set parameters to avoid errors.

[0080] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover a non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of another identical element in the process, method, article or device including the element.

[0081] From the description of the above embodiments, those skilled in the art can clearly understand that this application can be implemented by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in various embodiments or some parts of the embodiments of this application.

[0082] Each embodiment in this specification is described in a progressive manner. For the same or similar parts among the embodiments, reference can be made to each other. The key point of each embodiment is to illustrate the differences from other embodiments. In particular, for the system or system embodiments, since they are basically similar to the method embodiments, the description is relatively simple. For the relevant parts, reference can be made to the partial description of the method embodiments. The systems and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative efforts.

[0083] The above is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. An adjustable output solenoid valve power supply system, characterized in that: It includes a main controller, a fixed output driving power supply, an adjustable DC / DC conversion circuit, a parameter input circuit, a switch MOS tube, a constant current control circuit and a constant current MOS tube; The adjustable DC / DC conversion circuit, the parameter entry circuit, the switch MOS tube and the constant current control circuit are all connected to the main controller; the fixed output drive power supply and the switch MOS tube are all connected to the adjustable DC / DC conversion circuit; the constant current control circuit is connected to the constant current MOS tube, and the constant current MOS tube and the switch MOS tube are all connected to the solenoid valve; The adjustable DC / DC conversion circuit is used to receive the control signal sent by the main controller so as to convert the high-voltage DC power supply from the fixed output drive power supply into the DC drive power supply required by the current solenoid valve; the control signal is obtained by the main controller through calculation based on the configuration parameters required for the solenoid valve power supply input through the parameter entry circuit.

2. The adjustable output solenoid valve power supply system according to claim 1, characterized in that: It also includes a parameter display circuit, which is connected to the main controller; the parameter display circuit is used to display the parameter information set by the user in real time.

3. The adjustable output solenoid valve power supply system according to claim 2, characterized in that: The parameter display circuit includes a liquid crystal display or a digital tube display and an indicator light.

4. The adjustable output solenoid valve power supply system according to claim 1, characterized in that: The adjustable DC / DC conversion circuit includes a full-bridge DC / DC conversion circuit or a flyback DC / DC conversion circuit.

5. The adjustable output solenoid valve power supply system according to claim 1, characterized in that: The constant current control circuit includes a first digital-to-analog converter and a first operational amplifier circuit. The first digital-to-analog converter is used to output a reference voltage according to an instruction issued by the main controller, and the first operational amplifier circuit is used to condition the reference voltage to obtain the gate-source voltage required by the constant current MOS tube.

6. The adjustable output solenoid valve power supply system according to claim 1, characterized in that: The constant current MOS tube comprises a power type N-channel field effect MOS tube.

7. The adjustable output solenoid valve power supply system according to claim 1, characterized in that: It also includes a recovery monitoring circuit, which is connected to the constant current MOS tube and the main controller.

8. The adjustable output solenoid valve power supply system according to claim 7, characterized in that: The sampling monitoring circuit includes a sampling resistor, a second operational amplifier circuit and a second analog-to-digital converter; the current of the power supply link is reflected in the voltage difference between the two ends of the sampling resistor, which is adjusted to a voltage that meets the input conditions of the analog-to-digital converter through the second operational amplifier circuit, and the collected analog signal is converted into a digital signal through the second analog-to-digital converter and returned to the main controller.

9. A method for supplying power to a solenoid valve, characterized in that: Applied to a small solenoid valve, the method comprises: Connecting a small solenoid valve to a loop of the adjustable output solenoid valve power supply system according to any one of claims 1 to 8; According to the characteristic index of the small solenoid valve, the rated voltage V and rated power P parameters of the small solenoid valve are input into the main controller through the use of the parameter input circuit in combination with the parameter display circuit; The main controller converts the input rated voltage V and rated power P into impedance parameter R=V 2 / P and drive current parameter I=P / V are saved; The main controller calculates the driving power supply voltage value V0 required by the small solenoid valve according to the conditioning coefficient of the relevant conditioning circuit in the circuit and issues a command to make the adjustable DC / DC conversion circuit output the DC power supply voltage V0; The main controller issues an instruction to keep the current controlled by the constant current control circuit at current I by default; The main controller controls the switch MOS tube to be turned on, generates a current I in the power supply link, and forms a voltage difference ΔV across the sampling resistor; The voltage difference ΔV is uploaded to the main controller through a conditioning circuit composed of an operational amplifier and an analog-to-digital converter to achieve closed-loop control.

10. A method for supplying power to a solenoid valve, characterized in that: Applied to a large solenoid valve, the method comprises: Connecting the large solenoid valve to the loop of the adjustable output solenoid valve power supply system according to any one of claims 1 to 8; According to the characteristic indicators of the large solenoid valve, the impedance parameters Z, activation current Imax, holding current Imin, and activation current duration Tmax of the solenoid valve are input into the main controller of the system through the parameter input circuit and the parameter display circuit; The main controller calculates the power supply voltage value V1 required for the activation phase of the large electromagnetic valve and the power supply voltage value V2 required for the holding phase of the large electromagnetic valve according to the conditioning coefficient of the relevant conditioning circuit in the circuit, and issues instructions to make the adjustable DC / DC conversion circuit output the DC power supply voltage V1; The main controller issues an instruction to make the current controlled by the constant current control circuit remain at the current Imax by default; The main controller controls the switch MOS tube to be turned on, generates a current Imax in the power supply link, and forms a voltage difference ΔV1 across the sampling resistor; When the current in the circuit is maintained at the Imax level and after the Tmax time has passed, the main controller issues an instruction to adjust the output voltage of the adjustable DC / DC conversion circuit to V2, and at the same time controls the current controlled by the constant current control circuit to be the current Imin; The current in the power supply link is Imin, and a voltage difference ΔV2 is formed across the sampling resistor; The voltage difference ΔV1 and the voltage difference ΔV2 are both uploaded to the main controller through a conditioning circuit composed of an operational amplifier and an analog-to-digital converter, so as to implement closed-loop control of the main controller in the activation stage and the holding stage.

Images