Control system of electromagnetic valve and wireless control electromagnetic valve system

Abstract

The invention discloses a control system of an electromagnetic valve and a wireless control electromagnetic valve system. The control system of the electromagnetic valve comprises a transmitting end and a receiving end, the transmitting end comprises a transmitting coil circuit, and the transmitting end outputs energy to the receiving end through the transmitting coil circuit; the receiving end is electrically connected with the electromagnetic valve, the receiving end comprises a receiving coil circuit, the receiving end receives the energy sent by the transmitting coil circuit through the receiving coil circuit, and wireless power supply to the electromagnetic valve is achieved based on the received energy. Through the scheme disclosed by the invention, wireless power supply control can be performed on the electromagnetic valve, the problems existing in the traditional wired power supply mode are solved, and the power supply mode of the electromagnetic valve is optimized, so that the performance stability of the electromagnetic valve in complex environments such as a mine can be effectively improved.

Description

Technical Field

[0001] This disclosure generally relates to the field of wireless control technology. More specifically, this disclosure relates to a control system for a solenoid valve and a wirelessly controlled solenoid valve system. Background Technology

[0002] Solenoid valves are electromagnetically controlled industrial devices, fundamental components of automation used to control fluids, and belong to the actuator category. In industrial control systems, solenoid valves are commonly used to adjust the direction, flow rate, speed, or other parameters of the medium.

[0003] Solenoid valves can be used with different circuits to achieve the desired control effect, thus they can be widely used in diverse working environments. Currently, most solenoid valves on the market are powered by wires, but this wired power supply method has several drawbacks in practical applications. For example, the power supply wires are prone to aging or poor contact, affecting the performance of the solenoid valve and even reducing its lifespan, requiring frequent replacement. This is especially problematic in environments such as mines, where exposed wires and connectors pose challenges such as easy short circuits in the power supply lines, difficulty in replacing the solenoid valve, and difficulties in cable replacement and maintenance.

[0004] Therefore, there is an urgent need for a new control system for solenoid valves to optimize the power supply method of solenoid valves. Summary of the Invention

[0005] In order to at least solve one or more of the technical problems mentioned above, this disclosure proposes a control system for a solenoid valve and a wirelessly controlled solenoid valve system in several aspects.

[0006] In a first aspect, this disclosure provides a control system for a solenoid valve, comprising: a transmitter and a receiver, wherein the transmitter includes a transmitter coil circuit, and the transmitter outputs energy to the receiver through the transmitter coil circuit; the receiver is electrically connected to the solenoid valve, and the receiver includes a receiver coil circuit, and the receiver receives the energy transmitted by the transmitter coil circuit through the receiver coil circuit, and wirelessly supplies power to the solenoid valve based on the received energy.

[0007] In some embodiments, the receiver is detachably integrated onto the solenoid valve.

[0008] In some embodiments, the receiver further includes a first discharge circuit, wherein the first discharge circuit is configured to discharge the energy stored in the receiver in response to the receiving coil circuit not receiving energy.

[0009] In some embodiments, the transmitting end further includes a controlled switch circuit and a second discharge circuit. The controlled switch circuit is configured to provide an on-state pulse signal and an off-state pulse signal for controlling the operation of the solenoid valve. Under the action of the on-state pulse signal, the transmitting coil circuit outputs energy. Under the action of the off-state pulse signal, the second discharge circuit discharges the energy in the transmitting coil circuit so that the transmitting coil circuit stops outputting energy.

[0010] In some embodiments, the receiving end further includes: a high-frequency rectifier and filter circuit electrically connected to the receiving coil circuit and configured to rectify and filter the energy received by the receiving coil circuit to output a DC high voltage; and a step-down circuit electrically connected to the high-frequency rectifier and filter circuit and configured to convert the DC high voltage into the power supply voltage required by the solenoid valve.

[0011] In some embodiments, the step-down circuit includes a capacitor that supports energy storage; the first discharge circuit is electrically connected to the step-down circuit and is specifically configured to discharge the energy stored in the capacitor of the step-down circuit in response to the receiving coil circuit not receiving energy.

[0012] In some embodiments, the first discharge circuit is further configured to discharge the energy stored in the capacitor in the step-down circuit in response to the receiving coil circuit not receiving energy and the solenoid valve being closed.

[0013] In some embodiments, the first discharge circuit includes: a voltage monitoring unit configured to monitor the supply voltage of the buck circuit to the solenoid valve and output a reference voltage; a comparator, the two input terminals of which are electrically connected to the voltage monitoring unit and the buck circuit respectively, and configured to compare the reference voltage with the feedback voltage of the buck circuit, and output a discharge control signal when the reference voltage is higher than the feedback voltage, wherein the feedback voltage is obtained by voltage division of the supply voltage; and a discharge unit electrically connected to the output terminal of the comparator and the buck circuit respectively, and configured to start energy discharge operation in response to receiving the discharge control signal.

[0014] In some embodiments, the power-on time of the reference voltage is greater than the power-on time of the feedback voltage of the buck circuit.

[0015] In some embodiments, the receiving end further includes: a current sampling circuit electrically connected to the step-down circuit and configured to detect the operating current of the solenoid valve and selectively control the step-down circuit to turn off based on the operating current.

[0016] In some embodiments, the transmitting end further includes: a high-frequency oscillation circuit electrically connected to the transmitting coil circuit and configured to output a high-frequency pulse signal to the transmitting coil circuit; the transmitting coil circuit electrically connected to the controlled switch circuit and activated under the action of the controlled switch circuit, wherein the transmitting coil circuit generates the maximum alternating electromagnetic field when the resonant frequency of the resonant circuit of the transmitting coil circuit is the same as the frequency of the high-frequency pulse signal.

[0017] In a second aspect, this disclosure provides a wirelessly controlled solenoid valve system, including a control system for the solenoid valve as described in the first aspect and a solenoid valve, wherein the control system is electrically connected to the solenoid valve to wirelessly power and control the solenoid valve.

[0018] Through the solenoid valve control system provided above, this disclosed embodiment achieves wireless power supply to the solenoid valve by coordinating the transmitting coil circuit in the transmitting end and the receiving coil circuit in the receiving end. This overcomes the problems associated with traditional wired power supply, optimizes the power supply method for the solenoid valve, and effectively improves the performance stability of the solenoid valve in complex environments such as mines.

[0019] Furthermore, in some embodiments, the receiver is detachably mounted on the solenoid valve, for example, it can be integrated inside the solenoid valve. When the solenoid valve needs to be replaced due to its lifespan or other reasons, the receiver can be directly removed from the solenoid valve and installed in the new solenoid valve. It can be seen that the entire replacement process is unaffected by connecting wires, making replacement easy.

[0020] Furthermore, in some embodiments, a bleeder circuit can be incorporated into both the transmitting and / or receiving ends of the solenoid valve control system. This bleeder circuit in the receiving end can respond to rapid shutdown requirements, achieving time synchronization and preventing damage to some components in the receiving end. Conversely, a bleeder circuit in the transmitting end can respond to rapid start-up requirements, simultaneously dissipating energy from the transmitting coil circuit to prevent heat buildup in some components, thus providing effective protection. Moreover, when both the receiving and transmitting ends have bleeder circuits, the rapid opening and closing of the solenoid valve can be achieved through the coordination of the bleeder circuit with other circuits in the control system, ensuring the safety and stability of wireless power supply. Attached Figure Description

[0021] The above and other objects, features, and advantages of exemplary embodiments of this disclosure will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this disclosure are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0022] Figure 1 A schematic diagram of the control system of the solenoid valve according to an embodiment of this disclosure is shown;

[0023] Figure 2 A schematic block diagram of the transmitter structure according to an embodiment of this disclosure is shown;

[0024] Figure 3 A circuit schematic of the transmitter of an embodiment of this disclosure is shown;

[0025] Figure 4 A schematic block diagram of the receiver structure according to an embodiment of this disclosure is shown;

[0026] Figure 5 A circuit schematic of the receiver of an embodiment of this disclosure is shown; and

[0027] Figure 6 A schematic block diagram of a wirelessly controlled solenoid valve system according to an embodiment of this disclosure is shown. Detailed Implementation

[0028] The technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, not all of them. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0029] It should be understood that the terms “comprising” and “including” used in this disclosure and claims indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0030] It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this disclosure. As used in this disclosure and claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this disclosure and claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0031] As used in this specification and claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if [described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [described condition or event] is detected," or "in response to detection of [described condition or event]."

[0032] Exemplary application scenarios

[0033] Currently, most solenoid valves on the market use wired charging. This charging method involves exposed cables and connectors, which can easily lead to problems such as leakage, short circuits, difficulty in replacing the solenoid valve, and difficulty in maintaining the cables. Therefore, there is an urgent need to optimize the power supply method for solenoid valves.

[0034] To address the problems in the aforementioned scenarios, the inventors proposed a control system for solenoid valves that optimizes the power supply method of the solenoid valves and meets their power supply requirements in different scenarios.

[0035] Figure 1 A schematic diagram of the control system 100 for a solenoid valve according to an embodiment of this disclosure is shown. It is understood that the accompanying drawings shown in the embodiments of this disclosure are illustrative and not restrictive, and will not be elaborated upon further below.

[0036] like Figure 1 As shown, the control system 100 of the solenoid valve may include a transmitter 10 and a receiver 20.

[0037] The transmitter 10 includes a transmitting coil circuit 101, which can output energy to the receiver 20. The receiver 20 is connected to a solenoid valve. Figure 1 (Not shown in the image) Electrically connected, and the receiver 20 includes a receiving coil circuit 201. The receiver 20 receives energy transmitted by the transmitting coil circuit 101 through the receiving coil circuit 201, and wirelessly supplies power to the solenoid valve based on the received energy.

[0038] Therefore, through the cooperation between the transmitting coil circuit 101 in the transmitting end 10 and the receiving coil circuit 201 in the receiving end 20, energy is stored in the form of coil circuits and transferred through the electromagnetic coupling of the two coil circuits, thereby realizing wireless power supply to the solenoid valve. It can be seen that the disclosed solution overcomes the problems existing in traditional wired power supply, optimizes the power supply method of the solenoid valve, and thus effectively improves the performance stability of the solenoid valve in complex environments such as mines.

[0039] In some embodiments, the aforementioned receiver 20 is detachably integrated into the solenoid valve. For example, it can be integrated inside the solenoid valve or in other locations. When the solenoid valve needs to be replaced due to its lifespan or other reasons, the receiver can be directly removed from the solenoid valve and installed in the new solenoid valve. It can be seen that the entire replacement process is unaffected by connecting wires, making replacement easy. It should be noted that the description of the combination of the receiver and the solenoid valve here is merely illustrative, and the disclosed solution is not limited thereto. For example, the receiver may not be combined with the solenoid valve; the two can be set up independently, as long as they maintain an electrical connection.

[0040] Furthermore, considering the high requirements of the solenoid valve for rapid power response, this requirement can be met by optimizing the receiving end. For example, in some embodiments, a first discharge circuit can be provided in the receiving end 20. This first discharge circuit is configured to discharge the energy stored in the receiving end 20 in response to the receiving coil circuit 201 not receiving energy, thereby achieving rapid response shutdown and time synchronization. In addition, the timely discharge of energy in the receiving coil circuit 201 through the first discharge circuit can also prevent damage to some components in the receiving end 10.

[0041] In other embodiments, the requirement for rapid response can be met by optimizing the transmitter. Specifically, the transmitter 10 can be equipped with a controlled switching circuit and a second discharge circuit. The controlled switching circuit can be configured to provide an on-state pulse signal and an off-state pulse signal for controlling the operation of the solenoid valve, and under the action of the on-state pulse signal, the transmitting coil circuit 101 outputs energy. For example, the transmitting coil circuit 101 can start working in response to the on-state pulse signal, thereby outputting energy to achieve the purpose of rapid response start-up.

[0042] Under the aforementioned shutdown pulse signal, the energy in the transmitting coil circuit 101 can be discharged through the second discharge circuit, thereby stopping the transmitting coil circuit 101 from outputting energy. Thus, the energy in the transmitting coil circuit 101 is discharged in time through the second discharge circuit, which can prevent some components in the transmitting end 10 from accumulating heat and provide effective protection for these components.

[0043] In some embodiments, the requirement for rapid response can be met by simultaneously optimizing both the transmitting and receiving ends. Specifically, the aforementioned transmitting end 10 can be equipped with a controlled switching circuit and a second bleedering circuit. The controlled switching circuit can be configured to provide an on-state pulse signal and an off-state pulse signal to control the operation of the solenoid valve. Under the action of the aforementioned on-state pulse signal, the transmitting coil circuit 101 outputs energy to achieve rapid response startup. Under the action of the aforementioned off-state pulse signal, the energy in the transmitting coil circuit 101 can be discharged through the second bleedering circuit, causing the transmitting coil circuit 101 to stop outputting energy. When the transmitting coil circuit 101 stops outputting energy, the receiving coil circuit 201 of the receiving end 20 can no longer receive energy. At this time, the receiving end 20 also includes a first bleedering circuit, which is configured to discharge the energy stored in the receiving end 20 in response to the receiving coil circuit 201 not receiving energy, thereby achieving rapid response shutdown.

[0044] The following will combine Figure 2 and Figure 3 The specific structure and technical implementation of the aforementioned transmitter 10 will be described. Among them, Figure 2 A schematic block diagram of the transmitter 10 according to an embodiment of this disclosure is shown. Figure 3 A circuit diagram of the transmitter 10 according to an embodiment of this disclosure is shown. It should be noted that... Figure 3 Each circuit in the middle can be understood as... Figure 2 This is a specific implementation of the corresponding circuit block diagram.

[0045] like Figure 2 As shown, the transmitter 10 may include a transmitter coil circuit 101, a controlled switch circuit 102, a second discharge circuit 103, a high-frequency oscillation circuit 104, and a power supply circuit 105.

[0046] The power supply circuit 105 can provide the required operating voltage to each circuit in the transmitter 10. In some embodiments, the power supply circuit 105 can specifically provide a first operating voltage to the second discharge circuit 103, the high-frequency oscillation circuit 104, etc., and a second operating voltage to the transmitting coil circuit 101. Specifically, as shown... Figure 3 As shown, the power supply circuit 105 can be composed of several capacitors and a step-down chip (e.g., some commonly used "LMxx", "LTxx" series low dropout linear regulators (LDOs) or other types of step-down chips). In practical applications, the power supply circuit 105 can output a second operating voltage (e.g., 24V DC voltage) and a first operating voltage (e.g., 12V DC voltage) obtained by stepping down the voltage through the LDO.

[0047] A high-frequency oscillation circuit 104 is electrically connected to the transmitting coil circuit 101 and configured to output a high-frequency pulse signal to the transmitting coil circuit 101. For example... Figure 3 As shown, the high-frequency oscillation circuit 104 may specifically include an oscillator (e.g., some high-frequency "SMD" series oscillator chips, etc.) and a high-power drive amplifier circuit electrically connected thereto. The oscillator generates an oscillation signal after being powered on (12V), and this signal is processed by the high-power drive amplifier circuit to obtain a high-frequency pulse signal. In some embodiments, the high-power drive amplifier circuit may specifically employ a switching transistor (e.g., a high-power MOSFET with a push-pull structure, etc.).

[0048] Transmitting coil circuit 101 and controlled switch circuit 102 (e.g.) Figure 3 As shown, the circuit (which may include a controlled switch, several resistors and capacitors, etc.) is electrically connected and starts operating under the action of the controlled switch circuit 102. Specifically, the power supply circuit 105 provides operating voltage to the transmitting coil circuit 101 via the controlled switch circuit 102. For example, when the controlled switch circuit 102 is turned on, the power supply circuit 105 can output a 24V voltage to the transmitting coil circuit 101 to start operating the transmitting coil circuit 101.

[0049] In practical applications, the transmitting coil circuit 101 transmits electromagnetic signals of a certain frequency through a coupling coil. Regardless of the method used, as long as the magnetic flux through the closed loop changes, an induced electromotive force will inevitably appear in this closed loop. To improve the efficiency of electromagnetic signal recognition and reception, the LC resonant circuit in the transmitting coil circuit 101 should operate at resonance. The resonant frequency of the LC resonant circuit in the transmitting coil circuit 101 should match the frequency of the high-frequency pulse signal output by the aforementioned high-frequency oscillation circuit 104. The inductance of the coil L in the LC resonant circuit can be measured using a bridge circuit. Combined with the frequency of the high-frequency pulse signal output by the oscillator, the value of the resonant capacitance in the LC resonant circuit can be calculated. That is, when the resonant frequency of the transmitting coil circuit 101 is the same as the frequency of the high-frequency pulse signal output by the aforementioned high-frequency oscillation circuit 104, the coil L in the transmitting coil circuit 101 resonates with the capacitor C. At this time, the voltage and current of the coil reach their maximum values, thereby generating the maximum alternating electromagnetic field.

[0050] Furthermore, when current flows through the transmitting coil circuit 101, a potential difference is generated in the receiving coil circuit 201, thereby transferring electrical energy from the transmitting coil circuit 101 to the receiving coil circuit 201. Additionally, the current in the transmitting coil circuit 101 can be controlled based on the resonant frequency and the distance between the turns of the coil in the transmitting coil circuit. The current in the transmitting coil circuit 101 is coupled to the receiving coil circuit 201 via electromagnetic induction, and the voltage and current magnitude in the receiving coil circuit 201 can be adjusted by controlling the current in the transmitting coil circuit 101.

[0051] As mentioned above, under the action of the turn-off pulse signal, the second discharge circuit 103 can discharge the energy in the transmitting coil circuit 101, so that the transmitting coil circuit 101 stops outputting energy. Figure 3 As shown, the second discharge circuit 103 specifically includes diodes, transistors, several resistors, and switching transistors. In response to a turn-off pulse signal, the second discharge circuit 103 immediately discharges energy from the coil of the transmitting coil circuit 101, not only stopping the transmitting coil circuit 101 from outputting energy but also preventing damage to switching transistors (e.g., MOSFETs) and other devices caused by the current in the coil.

[0052] The following will combine Figure 4 and Figure 5 The specific structure and technical implementation of the aforementioned receiver 20 will be described. Among them, Figure 4 A schematic block diagram of the receiver 20 according to an embodiment of this disclosure is shown. Figure 5 A circuit schematic of the receiver 20 according to an embodiment of this disclosure is shown. It should be noted that... Figure 5 Each circuit in the middle can be understood as... Figure 4 This is a specific implementation of the corresponding circuit block diagram.

[0053] like Figure 4 As shown, the receiver 20 may include a receiving coil circuit 201, a first bleeder circuit 202, a high-frequency rectifier and filter circuit 203, a step-down circuit 204, and a current sampling circuit 205. Furthermore, to clearly explain the working principle of the receiver 20, in... Figure 4 The image also shows a solenoid valve 30.

[0054] The receiving coil circuit 201 is capable of receiving the energy transmitted by the transmitting coil circuit 101. For example... Figure 5 As shown, the receiving coil circuit 201 may include a coil L and a capacitor. When the receiving coil circuit 201 is close to the transmitting coil circuit 101, an induced voltage is generated in the receiving coil circuit 201. Resonance occurs when the resonant frequency of the receiving coil circuit 201 is the same as the transmitting frequency, and the voltage reaches its maximum value. In fact, the best energy transfer effect is achieved when both the transmitting coil circuit 101 and the receiving coil circuit 201 are in a resonant state.

[0055] A high-frequency rectifier and filter circuit 203 is electrically connected to the receiving coil circuit 201 and configured to rectify and filter the energy received by the receiving coil circuit 201 to output a high-voltage DC voltage. For example... Figure 5As shown, the high-frequency rectifier and filter circuit 203 may specifically include diodes, several capacitors, and Zener diodes. When the energy output from the transmitting coil circuit 101 enters the operating region of the receiving coil circuit 201, according to Faraday's law of electromagnetic induction, the magnetic flux of its coupling coil changes, generating an induced electromotive force and an induced current. Thus, the electromagnetic field energy obtained by the coupling coil can be converted into a high-frequency alternating voltage. Then, after filtering, rectification, and voltage regulation by the diodes, capacitors, and Zener diodes in the high-frequency rectifier and filter circuit 203, a high-voltage DC output can be obtained.

[0056] The step-down circuit 204 is electrically connected to the high-frequency rectifier and filter circuit 203 and is configured to convert the aforementioned DC high voltage into the power supply voltage required by the solenoid valve. For example... Figure 5 As shown, the step-down circuit 204 can be composed of a step-down chip, a capacitor 2041, etc. In some embodiments, the step-down chip in the step-down circuit 204 may specifically include a BUCK chip (such as some commonly used power management chips of the "LMGxx", "UCCxx" series, etc.) or other types of step-down chips. The aforementioned high DC voltage is stepped down by the step-down circuit 204 to obtain the power supply voltage (usually a low DC voltage) required by the solenoid valve 30.

[0057] As mentioned above, the first discharge circuit 202 can discharge energy from the receiving end 20. Specifically, in the receiving end 20, the solenoid valve is powered by a step-down circuit 204, and this step-down circuit 204 includes a capacitor 2041 that supports energy storage. Therefore, the first discharge circuit 202 can be electrically connected to the step-down circuit 204 and is specifically configured to discharge the energy stored in the capacitor 2041 in the step-down circuit 204 in response to the receiving coil circuit 201 not receiving energy. This allows for timely response to the rapid power-off requirement while simultaneously preventing damage to other components in the receiving end caused by continuous capacitor discharge.

[0058] In some embodiments, if the first discharge circuit releases energy when the solenoid valve is open, the solenoid valve may close prematurely, resulting in time synchronization issues. Therefore, the first discharge circuit 202 is specifically configured to release the energy stored in the capacitor of the step-down circuit in response to the receiving coil circuit 201 not receiving energy and the solenoid valve 30 being closed, so that the first discharge circuit releases energy when the solenoid valve is closed, ensuring time synchronization.

[0059] like Figure 5 As shown, in practical applications, the first bleeder circuit 202 includes: a voltage monitoring unit 2021, a comparator 2022 (e.g., some commonly used wide input range comparators), and a bleeder unit 2023. The voltage monitoring unit 2021 is configured to monitor the supply voltage (e.g., voltage from the buck circuit 204 to the solenoid valve 30) Figure 5In this circuit, the step-down chip outputs "VOUT-24V" and a reference voltage. The two inputs of comparator 2022 are electrically connected to voltage monitoring unit 2021 and step-down circuit 204 (specifically, connected to the FB port of the step-down chip), respectively. Comparator 2022 is configured to compare the reference voltage with the feedback voltage of step-down circuit 204 (e.g., the voltage "FB-24V" at the FB port of the step-down chip), and output a discharge control signal when the reference voltage is higher than the feedback voltage of the step-down circuit. The feedback voltage of step-down circuit 204 is obtained by dividing the supply voltage. Discharge unit 2023 is electrically connected to the output of comparator 2022 and step-down circuit 204, respectively, and is configured to initiate energy discharge operation in response to receiving the aforementioned discharge control signal, thereby discharging the energy stored in capacitor 2041 in step-down circuit 204.

[0060] Combination Figure 5 The supply voltage, reference voltage, and feedback voltage mentioned above will be further explained. Figure 5 In this circuit, the "VOUT-24V" output by the step-down chip in the step-down circuit 204 can be used as the power supply voltage for the solenoid valve. The voltage monitoring unit 2021 can monitor the power supply voltage "VOUT-24V" of the solenoid valve and output the aforementioned reference voltage. In some embodiments, the voltage monitoring unit 2021 can be equipped with a diode D1 and a capacitor C1 to isolate the power supply voltage. The power supply voltage is then isolated and divided by resistors to generate the reference voltage. For example, the power supply voltage ("VOUT-24V") is isolated to obtain an intermediate voltage ("VCC24V"). ​​This intermediate voltage is divided by resistors to generate the reference voltage, which can be understood as the voltage input from the voltage monitoring unit 2021 to the "VIN+" pin of the comparator 2022. The aforementioned feedback voltage can be understood as the voltage obtained after the power supply voltage is divided by resistors. For example, the supply voltage (“VOUT-24V”) is divided by resistors to obtain the feedback voltage (“FB-24V”), which is input to the “VIN-” pin of comparator 2022. It should be noted that “VOUT-24V”, “VCC24V”, and “FB-24V” are used here to describe the supply voltage, intermediate voltage, and feedback voltage, respectively, only as examples and do not specify the values ​​of these voltages.

[0061] Furthermore, in practical applications, there are certain requirements for the power-on timing of the first bleeder circuit 202. Specifically, the power-on time of the aforementioned reference voltage is longer than the power-on time of the feedback voltage of the buck circuit 204; that is, the power-on time of the reference voltage is slower than the feedback voltage time of the buck circuit 204. By limiting the power-on timing, the comparator 2022 can be controlled to not operate during the power-on phase. Thus, on the one hand, the power consumption of the first bleeder circuit can be reduced, and on the other hand, the comparator can be prevented from operating during the power-on phase, thus avoiding interference with the normal power supply of the buck circuit to the solenoid valve.

[0062] In some embodiments, the first discharge circuit 202 also has the ability to control its own voltage. For example, during the power-on phase, by setting several resistors and capacitors in the voltage monitoring unit 2021 and adjusting the capacitors, resistors, and other devices in the voltage monitoring unit 2021, the voltage input to the comparator 2022 (such as...) can be controlled. Figure 5 The voltage at pin "VIN+" of comparator 2022 must be less than the feedback voltage of buck circuit 204 during power-up (e.g., Figure 5 The voltage at pin "VIN-" of comparator 2022. During the discharge phase, the voltage input from voltage monitoring unit 2021 to comparator 2022 needs to decrease at a slower rate than the feedback voltage of buck circuit 204. In some embodiments, diode D1 and capacitor C1 can also be included in voltage monitoring unit 2021 to reduce the aforementioned supply voltage (i.e., the voltage at pin "VIN-"). Figure 5 In the diagram, the voltage at pin 2 of comparator 2022 is compared with the voltage at the anode of diode D1 ("VOUT-24V"). Figure 5 In this circuit, the "VCC24V" connected to the cathode of diode D1 is isolated after being divided by a resistor and input to the "VIN+" pin of comparator 2022. During actual operation, diode D1 and capacitor C1 charge during the power-on phase. When there is no energy input to the receiving coil circuit 201, the feedback voltage of the buck circuit 204 drops rapidly, while diode D1 and capacitor C1 continue to discharge. The "VCC24V" connected to the cathode of diode D1 is less affected by the power drop, thus making the voltage drop rate at the "VIN+" pin of comparator 2022 lower than that of the feedback voltage of the buck circuit 204.

[0063] In addition, the intermediate voltage (e.g., "VCC24V") obtained by isolating the aforementioned supply voltage ("VOUT-24V") can also be used as the operating voltage of comparator 2022. Based on the aforementioned isolation setting of diode D1 and capacitor C1, comparator 2022 can operate normally during the power-down phase.

[0064] The current sampling circuit 205 is electrically connected to the step-down circuit 204 and is configured to detect the operating current of the solenoid valve 30, and selectively control the step-down circuit to shut down based on the operating current. Figure 5 As shown, the current sampling circuit 205 may specifically include a resistor, an amplifier 2051 (e.g., an "OPA" operational amplifier), and a comparator 2052 (e.g., a commonly used wide input range comparator). In practical applications, when the current in the solenoid valve increases, a voltage drop is generated across the resistor R. This voltage drop is amplified by the amplifier and comparator and then compared with a predetermined current value converted into a voltage. When the voltage exceeds the predetermined value (e.g., the voltage VREF at pin "VIN-" of comparator 2052), the comparator outputs a level signal (EN) and controls the EN enable terminal in the buck converter chip to turn off the buck converter chip, thereby protecting the load output.

[0065] Specifically, such as Figure 5 As shown, after the energy is transmitted to the receiving coil circuit 201, it is processed by the receiving coil circuit 201 and the high-frequency rectifier and filter circuit 203 to obtain a DC high voltage (such as...). Figure 5 The voltage "VIN" in the text can be processed by a precision voltage source (such as a TL431 voltage source) to obtain the power supply voltage (e.g., ...). Figure 5 The voltage "VIN-S" in the text. This power supply voltage, after being divided by resistors, yields the aforementioned predetermined value (e.g., ...). Figure 5 The voltage "VREF" in the diagram. Additionally, the power supply voltage ("VIN-S") can power amplifier 2051 and comparator 2052. It should be noted that the description of the process for obtaining the predetermined values ​​is merely illustrative, and the disclosed solution is not limited thereto.

[0066] In practical applications, a solenoid valve control board can also be provided, which can be electrically connected to the transmitter 10 in the solenoid valve control system 100. Specifically, the solenoid valve control board is configured to output a switching control signal for the solenoid valve to the controlled switch circuit 102 in the transmitter 10. The controlled switch circuit 102 outputs an on / off pulse signal according to the received switching control signal. The high-frequency oscillation circuit 104 can operate under the action of the controlled switch circuit 102 and output a certain high-frequency pulse signal to control the on and off of the coil (wherein, when the coil is on, current flows through it; when it is off, the coil has a reverse induced electromotive force; after several cycles, an alternating peak voltage is generated through the coil, and this peak voltage is coupled to the coil at the receiver end through the coil magnetic field). When on, the transmitting coil circuit can immediately transfer energy to the receiving coil circuit 201, and when off, the energy of the transmitting coil circuit 101 can be immediately discharged through the second discharge circuit 103.

[0067] When the receiving coil circuit 201 receives electromagnetic field energy, it converts this energy into a high-frequency alternating voltage. This high-frequency alternating voltage is processed by the high-frequency rectifier and filter circuit 203. First, a pulsating DC voltage is rectified, and then filtered to obtain a smooth DC voltage (e.g., 24V). This DC voltage must operate within the on-state of the switch control signal cycle. The obtained DC voltage (e.g., 24V) is directly connected to the solenoid valve for operation. When turned off, this solenoid valve must stop working. The first discharge circuit 202 needs to discharge the charge stored in the capacitor of the step-down circuit to avoid affecting the operation of the next cycle.

[0068] In some embodiments, the switching control signal output by the aforementioned solenoid valve control board may include a PWM switching signal. The period of this PWM switching signal can be specifically set according to the application requirements (e.g., 2ms to 10ms). When the controlled switch is turned on, the coil magnetic flux begins to change current and generate a high-frequency alternating voltage, which is transferred to the receiving coil circuit through the coupling coil, and the solenoid valve starts to work. Conversely, it turns off. During the period of this PWM switching signal, the time for the receiving end to drive the solenoid valve to act must be consistent with the period of the PWM switching signal.

[0069] In some specific implementation scenarios, the switching cycle of the solenoid valve can be controlled by a solenoid valve control board, keeping the distance between the coils at the transmitting and receiving ends constant. The switching speed can be adjusted from slow to fast, or vice versa, all within the specified time period. For example, if the PWM switching signal period is 10ms, the on-time Ton = 5ms, and the off-time Toff = 5ms, the time for the receiver to drive the solenoid valve during either the on or off cycle must also be maintained at 5ms. It should be noted that the detailed description of the PWM switching signal period and the solenoid valve's operating time here is merely illustrative.

[0070] In some embodiments, if the solenoid valve actuation time at the receiving end is inconsistent with the PWM switching signal time, the time difference between the two can be adjusted by hardware or software. Specifically, the delay between the PWM switching signal time and the start and end times of the solenoid valve actuation are consistent each time. The solenoid valve actuation time can be understood as the time from when the transmitting end receives the switching control signal command to when the receiving end loads the solenoid valve and immediately responds.

[0071] Hardware-based methods can include adjusting the energy storage capacitor in the buck circuit. For example, the power-down time can be calculated using the capacitor's charge Q = i * ΔT = C * (U1 - U2). Here, U1 represents the supply voltage of the solenoid valve, (U1 - U2) represents the critical voltage that triggers the first discharge circuit to release energy, and U2 represents the preset voltage for the required power-down (i.e., the voltage difference between the supply voltage and the critical voltage). Adjusting the capacitor's capacitance c according to this value ensures that the calculated power-down time ΔT meets the requirements, thus compensating for the time difference. Alternatively, adjusting the discharge resistor in the discharge unit can also be used to discharge the energy stored in the buck circuit's capacitor as quickly as possible, thereby compensating for the time difference.

[0072] Furthermore, the aforementioned software approach needs to be adjusted according to the specific application of the solenoid valve. For example, the solenoid valve's actuation time can be evaluated, and the range of the PWM switching signal time can be adjusted to achieve time difference compensation. For instance, assuming the required solenoid valve opening time is 2ms, but the actual monitored opening time is 1.9ms, a compensation of 0.1ms is needed. This can be achieved by adjusting the PWM switching signal's on-time to 2.1ms.

[0073] Furthermore, in some embodiments, the aforementioned solenoid valve control board can be electrically connected to the control system of at least one solenoid valve to output switching control signals for each solenoid valve control system. In addition, the solenoid valve control board can also monitor and view the operating status of each solenoid valve control system, such as current and power. For example, a display screen or other visualization component can be provided on the solenoid valve control board to visually display the operating status of each solenoid valve control system, such as current and power.

[0074] Furthermore, the disclosed solution also provides a wirelessly controlled solenoid valve system. For example... Figure 6 As shown, the wirelessly controlled solenoid valve system 600 includes a solenoid valve control system 100 and a solenoid valve 30. The solenoid valve control system 100 is wirelessly connected to the solenoid valve 30 to provide wireless power supply and control. It should be noted that the specific structure, working principle, and combination details of the solenoid valve control system 100 with the solenoid valve 30 can be found in the preceding text. Figures 1-5 The relevant descriptions in the text will not be repeated here.

[0075] While numerous embodiments of this disclosure have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and intent of this disclosure. It should be understood that various alternatives to the embodiments of this disclosure described herein may be employed in the practice of this disclosure. The appended claims are intended to define the scope of this disclosure and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A control system for a solenoid valve, characterized in that, include: Transmitter and receiver, The transmitting end includes a transmitting coil circuit, and the transmitting end outputs energy to the receiving end through the transmitting coil circuit; The receiving end is electrically connected to the solenoid valve, and the receiving end includes a receiving coil circuit. The receiving end receives the energy sent by the transmitting coil circuit through the receiving coil circuit, and wirelessly supplies power to the solenoid valve based on the received energy.

2. The control system according to claim 1, characterized in that: The receiver is detachably integrated into the solenoid valve.

3. The control system according to claim 1, characterized in that: The receiving end further includes a first discharge circuit, wherein the first discharge circuit is configured to discharge the energy stored in the receiving end in response to the receiving coil circuit not receiving energy.

4. The control system according to claim 1 or 3, characterized in that: The transmitting end also includes a controlled switch circuit and a second discharge circuit. The controlled switch circuit is configured to provide an on-state pulse signal and an off-state pulse signal for controlling the operation of the solenoid valve. Under the action of the on-state pulse signal, the transmitting coil circuit outputs energy. Under the action of the off-state pulse signal, the second discharge circuit discharges the energy in the transmitting coil circuit so that the transmitting coil circuit stops outputting energy.

5. The control system according to claim 3, characterized in that, The receiving end also includes: A high-frequency rectifier and filter circuit is electrically connected to the receiving coil circuit and configured to rectify and filter the energy received by the receiving coil circuit to output a high DC voltage. A step-down circuit is electrically connected to the high-frequency rectifier and filter circuit and is configured to convert the DC high voltage into the power supply voltage required by the solenoid valve.

6. The control system according to claim 5, characterized in that: The step-down circuit includes a capacitor that supports energy storage; The first discharge circuit is electrically connected to the step-down circuit, and is specifically configured to discharge the energy stored in the capacitor of the step-down circuit in response to the receiving coil circuit not receiving energy.

7. The control system according to claim 6, characterized in that: The first discharge circuit is further configured to discharge the energy stored in the capacitor in the step-down circuit in response to the receiving coil circuit not receiving energy and the solenoid valve being closed.

8. The control system according to claim 7, characterized in that, The first discharge circuit includes: A voltage monitoring unit is configured to monitor the power supply voltage output from the step-down circuit to the solenoid valve and output a reference voltage. A comparator, wherein its two inputs are electrically connected to the voltage monitoring unit and the buck circuit, respectively, and is configured to compare the reference voltage with the feedback voltage of the buck circuit, and output a discharge control signal when the reference voltage is higher than the feedback voltage, wherein the feedback voltage is obtained by voltage division of the supply voltage; and The discharge unit is electrically connected to the output of the comparator and the step-down circuit, respectively, and is configured to start energy discharge operation in response to receiving the discharge control signal.

9. The control system according to claim 8, characterized in that: The power-on time of the reference voltage is greater than the power-on time of the feedback voltage of the buck circuit.

10. The control system according to claim 5, characterized in that, The receiving end also includes: A current sampling circuit is electrically connected to the step-down circuit and configured to detect the operating current of the solenoid valve and selectively control the step-down circuit to turn off based on the operating current.

11. The control system according to claim 4, characterized in that, The transmitter also includes: A high-frequency oscillation circuit is electrically connected to the transmitting coil circuit and configured to output a high-frequency pulse signal to the transmitting coil circuit; The transmitting coil circuit is electrically connected to the controlled switch circuit and starts working under the action of the controlled switch circuit. When the resonant frequency of the resonant circuit of the transmitting coil circuit is the same as the frequency of the high-frequency pulse signal, the transmitting coil circuit generates the maximum alternating electromagnetic field.

12. A wirelessly controlled solenoid valve system, characterized in that, include: Solenoid valve; as well as The control system of the solenoid valve according to any one of claims 1-11, wherein the control system is electrically connected to the solenoid valve to wirelessly power and control the solenoid valve.

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