A solenoid valve drive circuit and its control method

Abstract

The present invention discloses a solenoid valve drive circuit and its control method. The circuit includes: a controller for receiving an external control instruction to obtain a first control signal or a second control signal; an energy-saving drive circuit, where the energy-saving drive circuit and a non-energy-saving drive circuit are integrated on the same board. The energy-saving drive circuit is connected to the controller and receives the first control signal and the second control signal output by the controller to obtain a first switching signal and a second switching signal; a switching circuit, where the switching circuit is connected to the energy-saving drive circuit and receives the first switching signal and the second switching signal output by the energy-saving drive circuit. According to the first switching signal and the non-energy-saving drive circuit, the solenoid valve is controlled to be in a non-energy-saving state, or according to the second switching signal, the solenoid valve is controlled to be in an energy-saving state. By implementing the present invention, the energy-saving drive circuit and the non-energy-saving drive circuit are integrated on the same board, improving the integration degree of electrical products and meeting the requirements for the flight control of launch vehicles.

Description

Technical Field

[0001] The present invention relates to the technical field of the electrical system of a launch vehicle, and particularly relates to a solenoid valve drive circuit and a control method thereof. Background Art

[0002] The solenoid valve is an important component of the electrical system of a launch vehicle (or missile weapon). It is the direct driver of the corresponding actions of the launch vehicle during the entire flight process and is a type of actuator. Its function is to execute the instructions issued by the flight control computer during the flight of the launch vehicle, drive the actions of the corresponding valves, and achieve the goal of the rocket's orbital flight.

[0003] The solenoid valve has a certain service life. The current flowing through it under the rated voltage is relatively large, and it cannot work for a long time. For some occasions where the launch vehicle has long-term flow control, the solenoid valve must be in a long-term working state. In order to improve the service life of the solenoid valve, the solenoid valve must be transitioned from a non-energy-saving state to an energy-saving working state. That is, in the normal energy-saving working state of the solenoid valve, the working current is reduced and the power consumption is reduced, but the normal working state of the solenoid valve must be maintained.

[0004] For the design of making the solenoid valve in an energy-saving working state, the traditional method is to reduce the working voltage at both ends of the solenoid valve to a certain specific value in the non-energy-saving state. According to Ohm's law, the corresponding working current also decreases accordingly, so as to achieve the purpose of the solenoid valve working in an energy-saving manner. That is, the traditional scheme is a method of changing from a higher constant voltage to a lower constant voltage and then reducing the current to achieve the energy-saving use of the solenoid valve.

[0005] However, in the prior art, in order to make the solenoid valve switch to the energy-saving use state, based on the normal rated power supply, an additional power supply with a lower constant voltage needs to be added, which increases the additional cost of the instrument, including the circuit volume and weight; at the same time, due to the addition of the power supply, an additional power distribution switching circuit needs to be added for control, which increases the circuit cost and debugging work of the instrument. Summary of the Invention

[0006] In view of this, the embodiments of the present invention provide a solenoid valve drive circuit and a control method thereof to solve the technical problem of increasing additional costs when the existing solenoid valve is used in an energy-saving manner.

[0007] The technical solutions provided by the embodiments of the present invention are as follows:

[0008] In the first aspect of the embodiment of the present invention, a solenoid valve driving circuit is provided, including: a controller for receiving an external control instruction to obtain a first control signal or a second control signal; an energy-saving driving circuit, where the energy-saving driving circuit and a non-energy-saving driving circuit are integrated on the same board, and the energy-saving driving circuit is connected to the controller to receive the first control signal and the second control signal output by the controller to obtain a first switching signal and a second switching signal; a switching circuit, where the switching circuit is connected to the energy-saving driving circuit to receive the first switching signal and the second switching signal output by the energy-saving driving circuit, and controls the solenoid valve to be in a non-energy-saving state according to the first switching signal and a non-energy-saving control circuit, or controls the solenoid valve to be in an energy-saving state according to the second switching signal.

[0009] Optionally, the controller is further configured to receive an external control instruction and output a third control signal, the energy-saving driving circuit receives the third control signal to obtain a third switching signal, and the switching circuit controls the solenoid valve to close according to the third switching signal.

[0010] Optionally, the first control signal is a high-level signal, the second control signal is a PWM signal, and the third control signal is a low-level signal.

[0011] Optionally, the energy-saving driving circuit includes: an isolation driving circuit and an isolation power supply circuit connected in sequence.

[0012] Optionally, the isolation driving circuit includes: a first resistor, a second resistor, and an isolation driving chip. One end of the first resistor is externally connected to a power supply, the other end of the first resistor is connected to one end of the second resistor and the second pin of the isolation driving chip, the other end of the second resistor is connected to the input end of the isolation driving circuit and the third pin of the isolation driving chip, the fifth pin and the eighth pin of the isolation driving chip are connected to the isolation power supply circuit, the fifth pin of the isolation driving chip is connected to the second output end of the isolation driving circuit, and the sixth pin of the isolation driving chip is connected to the seventh pin and the first output end of the isolation driving circuit.

[0013] Optionally, the isolation power supply circuit includes a first capacitor, a second capacitor, a third capacitor, and an isolation power supply chip. One end of the first capacitor is connected to the first pin of the isolation power supply chip and is externally connected to a power supply, the other end of the first capacitor is connected to the second pin of the isolation power supply chip and is grounded, one end of the second capacitor is connected to the sixth pin of the isolation power supply chip, one end of the third capacitor, and the eighth pin of the isolation driving chip, and the other end of the second capacitor is connected to the fifth pin of the isolation power supply chip, the other end of the third capacitor, and the fifth pin of the isolation driving chip.

[0014] Optionally, the switching circuit includes: a first switch and a second switch connected in parallel.

[0015] Optionally, the switch circuit further includes: a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first diode, and a second diode. One end of the third resistor is connected to the negative electrode of the first diode, the negative electrode of the second diode, one end of the fourth resistor, and the first output terminal of the isolation drive circuit; the other end of the third resistor is connected to the positive electrode of the first diode, one end of the fifth resistor, and the fourth pin of the first switch; the other end of the fifth resistor is connected to the first pin, the second pin, the third pin of the first switch, and the solenoid valve; the other end of the fourth resistor is connected to the positive electrode of the second diode, one end of the sixth resistor, and the fourth pin of the second switch; the other end of the sixth resistor is connected to the first pin, the second pin, the third pin of the second switch, and the solenoid valve.

[0016] Optionally, the switch circuit further includes: a fourth capacitor, a third diode, and a seventh resistor. One end of the fourth capacitor is connected to the first output terminal of the isolation drive circuit, the other end of the fourth capacitor is grounded, the negative electrode of the third diode is connected to the solenoid valve and the second output terminal of the isolation drive circuit, the positive electrode of the third diode is connected to the seventh resistor, and the other end of the seventh resistor is grounded.

[0017] A second aspect of the embodiments of the present invention provides a control method for a solenoid valve drive circuit, which is applied to the solenoid valve drive circuit as described in the first aspect and any one of the first aspects of the embodiments of the present invention, and includes: receiving an external control instruction to obtain a first control signal or a second control signal; obtaining a first switch signal according to the first control signal, or obtaining a second switch signal according to the second control signal; controlling the solenoid valve to be in a non-energy-saving state according to the first switch signal, or controlling the solenoid valve to be in an energy-saving state according to the second switch signal.

[0018] The technical solution of the present invention has the following advantages:

[0019] The solenoid valve drive circuit provided by the embodiments of the present invention

[0020] The solenoid valve drive circuit provided by the embodiments of the present invention integrates an energy-saving drive circuit and a non-energy-saving drive circuit on the same module board, as a component of the entire system (the whole machine), improving the integration of electrical products, while reducing the weight and complexity of the electrical system, and ultimately improving the reliability of the entire electrical system, meeting the requirements for the flight control of the launch vehicle. At the same time, by receiving the external control instruction, the solenoid valve is controlled to be in an energy-saving state through the energy-saving drive circuit and the switch circuit, achieving the purpose of energy-saving use of the solenoid valve.

[0021] The control method of the solenoid valve drive circuit provided by the embodiment of the present invention obtains the first switch signal or the second switch signal through the received external control instruction, controls the solenoid valve to be in an energy-saving state, and achieves the purpose of energy-saving use of the solenoid valve. At the same time, this control method can meet the requirements of the compatibility of the non-energy-saving and energy-saving switch controls of the solenoid valve of the commercial launch vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is the structural block diagram of the solenoid valve drive circuit in the embodiment of the present invention;

[0024] Figure 2 It is the structural schematic diagram of the energy-saving drive circuit in the embodiment of the present invention;

[0025] Figure 3 It is the structural schematic diagram of the switch circuit in the embodiment of the present invention;

[0026] Figure 4 It is the flowchart of the control method of the solenoid valve drive circuit in the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following will clearly and completely describe the technical solutions of the present invention with reference to the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the protection scope of the present invention.

[0028] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may also be the communication inside two components. It may be a wireless connection or a wired connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0030] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] An embodiment of the present invention provides a solenoid valve drive circuit, as Figure 1 shown. The drive circuit includes: a controller 10 for receiving an external control instruction to obtain a first control signal or a second control signal; an energy-saving drive circuit 20. The energy-saving drive circuit 20 and a non-energy-saving drive circuit are integrated on the same board. The energy-saving drive circuit 20 is connected to the controller 10 and receives the first control signal and the second control signal output by the controller 10 to obtain a first switching signal and a second switching signal; a switching circuit 30. The switching circuit 30 is connected to the energy-saving drive circuit 20 and receives the first switching signal and the second switching signal output by the energy-saving drive circuit 20. According to the first switching signal and the non-energy-saving drive circuit, the solenoid valve is controlled to be in a non-energy-saving state, or according to the second switching signal, the solenoid valve is controlled to be in an energy-saving state. Specifically, the controller 10 uses an FPGA, a DSP, or a single-chip microcomputer, etc. Among them, the FPGA can select the A3P1000-PQ208I model to integrate the IP core of the high-speed serial bus SC and the signal filtering IP, etc.

[0032] The solenoid valve drive circuit provided by the embodiment of the present invention integrates the energy-saving drive circuit and the non-energy-saving drive circuit on the same modular board and serves as a component of the entire system (the whole machine), improving the integration degree of the electrical product, reducing the weight and complexity of the electrical system, and ultimately improving the reliability of the entire electrical system to meet the requirements for the flight control of the launch vehicle. At the same time, by receiving the external control instruction and controlling the solenoid valve to be in the energy-saving state through the energy-saving drive circuit and the switching circuit, the purpose of energy-saving use of the solenoid valve is achieved.

[0033] In one embodiment, the controller 10 is further configured to receive an external control instruction and output a third control signal. The energy-saving drive circuit 20 receives the third control signal to obtain a third switching signal, and the switching circuit 30 controls the solenoid valve to close according to the third switching signal. Among them, the third control signal is a low-level signal. Specifically, when the energy-saving state time of the solenoid valve is sufficient, a solenoid valve closing instruction is sent through the internal bus. At this time, the controller 10 outputs a low-level signal according to the closing instruction, and the energy-saving drive circuit 20 controls the switch in the switching circuit 30 to disconnect according to the low-level signal, and the solenoid valve closes.

[0034] In one embodiment, the first control signal is a high-level signal, and the second control signal is a PWM signal. Specifically, when non-energy-saving control of the solenoid valve is required, a non-energy-saving control instruction is sent through the internal bus. The controller 10 outputs a high-level signal according to the instruction, and the energy-saving drive circuit 20 controls the switch in the switching circuit 30 to conduct, and the solenoid valve opens. The non-energy-saving drive circuit 20 controls the solenoid valve to be in a non-energy-saving state. After the solenoid valve is in a stable non-energy-saving state for a period of time, when the solenoid valve needs to work in a normal energy-saving working state, an energy-saving control instruction is sent through the internal bus; the controller 10 outputs a PWM signal (the frequency of the PWM signal is fixed, and the duty cycle decreases from 1 to X according to the working time, X is less than 1, and the value of X can be determined according to the current situation of the solenoid valve used in debugging); the energy-saving drive circuit 20 controls the switch in the switching circuit 30 to remain conducting according to the PWM signal; the solenoid valve is in an energy-saving state.

[0035] In one embodiment, for the PWM signal output by the controller 10, the relationship between its duty cycle and time can be set according to Table 1. Among them, the period frequency of the PWM pulse is 30K, the duty cycle changes from 100% to 70%, and then stabilizes at 70%. When the energy-saving drive circuit 20 drives the solenoid valve to work in an energy-saving manner according to the PWM signal, the results show that the solenoid valve works stably and reliably in an energy-saving manner, and the energy-saving current is consistent with the set value, achieving the purpose of energy saving.

[0036] Table 1

[0037]

[0038] In one embodiment, the energy-saving drive circuit 20 includes: an isolation drive circuit and an isolation power supply circuit connected in sequence.

[0039] Among them, as Figure 2As shown, the isolation drive circuit includes: a first resistor R1, a second resistor R2, and an isolation drive chip B1. One end of the first resistor R1 is externally connected to a power supply, and the other end of the first resistor R1 is connected to one end of the second resistor R2 and the second pin of the isolation drive chip B1. The other end of the second resistor R2 is connected to the input end of the isolation drive circuit and the third pin of the isolation drive chip B1. The fifth pin and the eighth pin of the isolation drive chip B1 are connected to the isolation power supply circuit. The fifth pin of the isolation drive chip B1 is connected to the second output end S of the isolation drive circuit, and the sixth pin of the isolation drive chip B1 is connected to the seventh pin and the first output end G of the isolation drive circuit.

[0040] As Figure 2 shown, the isolation power supply circuit includes a first capacitor C1, a second capacitor C2, a third capacitor C3, and an isolation power supply chip N1. One end of the first capacitor C1 is connected to the first pin of the isolation power supply chip N1 and is externally connected to a power supply, and the other end of the first capacitor C1 is connected to the second pin of the isolation power supply chip N1 and is grounded. One end of the second capacitor C2 is connected to the sixth pin of the isolation power supply chip N1, one end of the third capacitor C3, and the eighth pin of the isolation drive chip B1. The other end of the second capacitor C2 is connected to the fifth pin of the isolation power supply chip N1, the other end of the third capacitor C3, and the fifth pin of the isolation drive chip B1.

[0041] In a specific embodiment, the isolation drive chip B1 can select an optocoupler with the model number HCPL-3180. Selecting this optocoupler as the isolation drive chip B1 can make the energy-saving drive circuit 20 have the characteristics of high speed and large drive current, and can also make the energy-saving drive circuit 20 adapt to the first control signal and the second control signal output by the controller 10. The isolation power supply chip N1 selects the power supply DCP010515. The isolation power supply chip N1 can provide 15V voltage for the isolation drive chip B1 when the external input voltage is 5V, meeting the requirements of controlling the voltage and current in the switching circuit 30. Specifically, the first resistor R1 and the second resistor R2 in the isolation drive circuit are used for the threshold voltage of the isolation drive chip B1 to improve the anti-interference ability of the energy-saving drive circuit 20. The first capacitor C1 in the isolation power supply circuit is used as the input filter capacitor of the isolation power supply chip N1, and the second capacitor C2 and the third capacitor C3 are used as the output filter capacitors of the isolation power supply chip N1.

[0042] In an embodiment, as Figure 3As shown, the switch circuit 30 includes a first switch V1 and a second switch V2 connected in parallel. The switch circuit 30 further includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first diode D1, and a second diode D2. One end of the third resistor R3 is connected to the negative electrode of the first diode D1, the negative electrode of the second diode D2, one end of the fourth resistor R4, and the first output terminal G of the isolation drive circuit; the other end of the third resistor R3 is connected to the positive electrode of the first diode D1, one end of the fifth resistor R5, and the fourth pin of the first switch V1. The other end of the fifth resistor R5 is connected to the first pin, the second pin, the third pin of the first switch V1, and the solenoid valve; the other end of the fourth resistor R4 is connected to the positive electrode of the second diode D2, one end of the sixth resistor R6, and the fourth pin of the second switch V2. The other end of the sixth resistor R6 is connected to the first pin, the second pin, the third pin of the second switch V2, and the solenoid valve.

[0043] In one embodiment, as Figure 3 shown, the switch circuit 30 further includes a fourth capacitor C4, a third diode D3, and a seventh resistor R7. One end of the fourth capacitor C4 is connected to the first output terminal G of the isolation drive circuit, and the other end of the fourth capacitor C4 is grounded. The negative electrode of the third diode D3 is connected to the solenoid valve and the second output terminal S of the isolation drive circuit, the positive electrode of the third diode D3 is connected to the seventh resistor R7, and the other end of the seventh resistor R7 is grounded. Specifically, an eighth resistor R8 and a ninth resistor R9 connected in parallel are further included between the solenoid valve and the second output terminal S of the isolation drive circuit.

[0044] In a specific embodiment, in order to reduce the printed circuit board area, both the first switch V1 and the second switch V2 use MOS transistors of model BSC035N10NS5. The main parameters of this MOS transistor are as follows: the operating junction temperature is -55°C to 175°C; the breakdown voltage is 100V; the maximum operating current is 100A; the maximum junction resistance is 3.5mΩ. The MOS transistors in the switch circuit 30 all adopt a redundant design, with two MOS transistors used for each output, and the current is shared by the 2 MOS transistors to reduce the total heat generation. The third resistor R3 and the fourth resistor R4 in the switch circuit 30 are drive resistors, the fifth resistor R5 and the sixth resistor R6 are protection resistors, and the first diode and the second diode D2 are discharge diodes. Since a reverse electromotive force will be generated in the solenoid valve when the MOS transistor is turned off, a snubber circuit is added to the circuit output. The snubber circuit includes the seventh resistor R7 and the third diode D3.

[0045] In one embodiment, the solenoid valve drive circuit uses an FPGA, an energy-saving drive circuit 20, and a MOS transistor. During the control process of the solenoid valve, the control instruction of the flight control computer is sent to the FPGA through the internal bus for decoding and control. The FPGA outputs an effective high-level or PWM control signal, which is then output to the input end of the MOS transistor by the energy-saving drive circuit 20. The MOS transistor loads the bus voltage VCC to the corresponding solenoid valve.

[0046] The solenoid valve drive circuit provided by the embodiment of the present invention uses the first switch and the second switch with small volume, small internal resistance, large flowing current, and low heat generation. Multiple energy-saving drive circuits for solenoid valves can be integrated on one printed circuit board, greatly reducing the volume of electronic instruments. At the same time, the first switch and the second switch have a fast action speed, can adapt to the high-frequency action of PWM, have no sensitive direction, are easy to install, and reduce the design difficulty of layout and wiring.

[0047] The solenoid valve drive circuit provided by the embodiment of the present invention has a simple energy-saving drive circuit design. It uses an independent isolated power supply chip and a high-speed, large-driving-capability integrated isolated drive chip, adding less hardware to the original circuit, and the circuit design is simple and reliable. At the same time, the frequency and duty cycle of the PWM control signal output by the controller are variable, which can meet the requirements of different solenoid valves for control current.

[0048] The solenoid valve drive circuit provided by the embodiment of the present invention has a safe, reliable, and high-integration circuit design. The number of output channels of the energy-saving circuit for solenoid valves with the same volume is more than five times that of the traditional scheme, and the output current also reaches more than five times. Moreover, the designed circuit has passed the environmental test and system test assessment, which is beneficial to the integrated and miniaturized design of electronic equipment or electrical systems.

[0049] The embodiment of the present invention also provides a control method for a solenoid valve drive circuit, which is applied to the solenoid valve drive circuit described in any one of the above embodiments, as Figure 4 shown. The control method includes the following steps:

[0050] Step S101: Receive an external control instruction to obtain a first control signal or a second control signal. In one embodiment, when the solenoid valve needs to enter the working state, the flight control computer can send a control instruction such as an energy-saving control instruction or a non-energy-saving control instruction to the controller. The controller receives the control instruction for decoding and control to obtain the first control signal and the second control signal. Among them, the first control signal is a high-level signal, which can be obtained by decoding the non-energy-saving control instruction. The second control signal is a PWM signal, which can be obtained by decoding the energy-saving control instruction. Specifically, the frequency of the PWM signal is fixed, and the duty cycle decreases from 1 to X according to the working time, where X is less than 1, and the value of X can be determined according to the current situation of the solenoid valve used in debugging.

[0051] Step S102: Obtain a first switching signal according to a first control signal, or obtain a second switching signal according to a second control signal. In an embodiment, the controller outputs the first control signal or the second control signal. When the first control signal is output, the energy-saving drive circuit obtains the first switching signal according to this signal. When the second control signal is output, the energy-saving drive circuit obtains the second switching signal according to this signal.

[0052] Step S103: Control the solenoid valve to be in a non-energy-saving state according to the first switching signal, or control the solenoid valve to be in an energy-saving state according to the second switching signal. In an embodiment, the energy-saving drive circuit controls the switch in the switch circuit to conduct according to the first switching signal, and the solenoid valve opens, and at this time the solenoid valve is in a non-energy-saving state. After the solenoid valve is in the energy-saving state for a period of time, the energy-saving drive circuit controls the switch in the switch circuit to remain conducting according to the second switching signal. At this time, the solenoid valve is in the energy-saving state.

[0053] The control method of the solenoid valve drive circuit provided by the embodiment of the present invention obtains the first switching signal or the second switching signal through the received external control instruction, and controls the solenoid valve to be in the energy-saving state, achieving the purpose of energy-saving use of the solenoid valve. At the same time, this control method can meet the requirements of the compatibility of the non-energy-saving and energy-saving switch controls of the solenoid valve of the commercial launch vehicle.

[0054] Although the exemplary embodiments and their advantages have been described in detail, those skilled in the art can make various changes, substitutions and modifications to these embodiments without departing from the spirit of the present invention and the protection scope defined by the appended claims. Such modifications and variations all fall within the scope defined by the appended claims. For other examples, those of ordinary skill in the art should easily understand that while maintaining the protection scope of the present invention, the order of the process steps can be changed.

[0055] In addition, the application scope of the present invention is not limited to the processes, mechanisms, manufacturing, material compositions, means, methods and steps of the specific embodiments described in the specification. From the disclosure of the present invention, those of ordinary skill in the art will easily understand that for the processes, mechanisms, manufacturing, material compositions, means, methods or steps that already exist or will be developed in the future, in which they perform substantially the same functions or obtain substantially the same results as the corresponding embodiments described in the present invention, they can be applied in accordance with the present invention. Therefore, the appended claims of the present invention are intended to include these processes, mechanisms, manufacturing, material compositions, means, methods or steps within their protection scope.

Claims

1. A solenoid valve drive circuit, characterized in that, Comprising: A controller for receiving an external control instruction to obtain a first control signal or a second control signal; An energy-saving drive circuit, the energy-saving drive circuit and a non-energy-saving drive circuit are integrated on the same board, the energy-saving drive circuit is connected to the controller, and receives the first control signal and the second control signal output by the controller to obtain a first switching signal and a second switching signal; A switching circuit, the switching circuit is connected to the energy-saving drive circuit, receives the first switching signal and the second switching signal output by the energy-saving drive circuit, and controls the solenoid valve to be in a non-energy-saving state according to the first switching signal and the non-energy-saving drive circuit, or controls the solenoid valve to be in an energy-saving state according to the second switching signal.

2. The solenoid valve drive circuit according to claim 1, wherein The controller is further configured to receive an external control instruction and output a third control signal, the energy-saving drive circuit receives the third control signal to obtain a third switching signal, and the switching circuit controls the solenoid valve to close according to the third switching signal.

3. The solenoid valve drive circuit according to claim 2, wherein The first control signal is a high-level signal, the second control signal is a PWM signal, and the third control signal is a low-level signal.

4. The solenoid valve drive circuit according to claim 1, wherein, The energy-saving drive circuit includes: an isolation drive circuit and an isolation power supply circuit connected in sequence.

5. The solenoid valve drive circuit according to claim 4, wherein The isolation drive circuit includes: a first resistor, a second resistor, and an isolation drive chip, One end of the first resistor is externally connected to a power supply, the other end of the first resistor is connected to one end of the second resistor and the second pin of the isolation drive chip, the other end of the second resistor is connected to the input end of the isolation drive circuit and the third pin of the isolation drive chip, the fifth pin and the eighth pin of the isolation drive chip are connected to the isolation power supply circuit, the fifth pin of the isolation drive chip is connected to the second output end of the isolation drive circuit, and the sixth pin of the isolation drive chip is connected to the seventh pin and the first output end of the isolation drive circuit.

6. The solenoid valve drive circuit according to claim 5, wherein, The isolation power supply circuit includes a first capacitor, a second capacitor, a third capacitor, and an isolation power supply chip, One end of the first capacitor is connected to the first pin of the isolation power supply chip and is externally connected to a power supply, the other end of the first capacitor is connected to the second pin of the isolation power supply chip and is grounded, one end of the second capacitor is connected to the sixth pin of the isolation power supply chip, one end of the third capacitor, and the eighth pin of the isolation drive chip, and the other end of the second capacitor is connected to the fifth pin of the isolation power supply chip, the other end of the third capacitor, and the fifth pin of the isolation drive chip.

7. The solenoid valve drive circuit according to claim 5, wherein The switching circuit includes: a first switch and a second switch connected in parallel.

8. The solenoid valve drive circuit according to claim 7, wherein, The switching circuit further includes: a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first diode, and a second diode, One end of the third resistor is connected to the negative electrode of the first diode, the negative electrode of the second diode, one end of the fourth resistor, and the first output end of the isolation drive circuit; the other end of the third resistor is connected to the positive electrode of the first diode, one end of the fifth resistor, and the fourth pin of the first switch; the other end of the fifth resistor is connected to the first pin, the second pin, the third pin of the first switch, and the solenoid valve; The other end of the fourth resistor is connected to the positive electrode of the second diode, one end of the sixth resistor, and the fourth pin of the second switch, and the other end of the sixth resistor is connected to the first pin, the second pin, the third pin of the second switch, and the solenoid valve.

9. The electromagnetic valve drive circuit according to claim 8, wherein The switch circuit further includes: a fourth capacitor, a third diode, and a seventh resistor. One end of the fourth capacitor is connected to the first output terminal of the isolation drive circuit, the other end of the fourth capacitor is grounded, the negative electrode of the third diode is connected to the solenoid valve and the second output terminal of the isolation drive circuit, the positive electrode of the third diode is connected to the seventh resistor, and the other end of the seventh resistor is grounded.

10. A control method for a solenoid valve drive circuit, characterized in that, Applied to the solenoid valve drive circuit according to any one of claims 1-9, including: Receiving an external control instruction to obtain a first control signal or a second control signal; Obtaining a first switch signal according to the first control signal, or obtaining a second switch signal according to the second control signal; Controlling the solenoid valve to be in a non-energy-saving state according to the first switch signal, or controlling the solenoid valve to be in an energy-saving state according to the second switch signal.

Images