Solenoid valve action control circuit and action control method
By designing a circuit that uses DC electric signals with different electrical parameters to control the solenoid valve, the problems of high power consumption and heating in the prior art are solved, and the effects of low power consumption and long-term stable operation are achieved.
Patent Information
- Application Number
- CN202411948908.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-04-15
AI Technical Summary
The existing DC solenoid valve control circuit has high power consumption, which leads to heating problems and affects long-term operating stability and service life.
A solenoid valve action control circuit is designed, and DC electric signals with different electrical parameters are output through the first module and the second module, and the start and maintenance status of the solenoid valve are controlled by a preset slow start time to realize low-power solenoid valve control.
It effectively reduces the working power consumption and heat generation of the solenoid valve, ensures long-term and stable work, and achieves low-temperature energy saving and reliability.
Smart Images
Figure CN119825969A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of circuit control, and in particular to an action control circuit and an action control method of a solenoid valve. Background Art
[0002] At present, DC solenoid valves, as an important action execution component, have been widely used in many fields, including home appliances, automobile manufacturing, medical equipment, scientific research experiments, and industrial automation. With the development of technology and the diversification of market demand, the role of DC solenoid valves in the above fields has become increasingly important, and its application can provide reliable and flexible fluid control solutions for some application scenarios in various fields.
[0003] In order to meet the needs of different application scenarios, various control circuit designs for DC solenoid valves have also emerged. One of the more common control circuit designs is to directly enable relays or transistors through IO ports to control the on-off state of the DC solenoid valve. This DC solenoid valve control circuit design is simple to implement and has low cost, and is widely used in actual projects.
[0004] However, this DC solenoid valve control circuit design scheme still has obvious limitations: on the one hand, it may lead to higher overall power consumption of the DC solenoid valve; on the other hand, the high heat generated by the high power consumption may cause overheating problems, which may damage the internal structure of the DC solenoid valve, reduce its stability during long-term operation and shorten its service life. Summary of the invention
[0005] In view of this, an embodiment of the present invention provides a solenoid valve motion control circuit and a motion control method.
[0006] A first aspect of the present invention provides a solenoid valve action control circuit, comprising: a first module, a second module and a gating module; The first module is used to output a direct current signal having a first electrical parameter when receiving an enable signal input; The second module is used to output a direct current signal with second electrical parameters after a preset slow start time when receiving an enable signal input, and simultaneously output a direct current signal with second electrical parameters to the first module, so that the first module stops outputting the direct current signal with first electrical parameters; The gating module is used to select one of the DC signal with the first electrical parameter and the DC signal with the second electrical parameter to pass according to a preset condition, so that the solenoid valve performs different actions; The direct current signal with the first electrical parameter is greater than the direct current signal with the second electrical parameter.
[0007] Further, the first module includes a first transistor, a second transistor and a triode; Wherein, the second transistor receives an enable signal, the drain of the second transistor is connected to the base of the transistor, and the collector of the transistor is connected to the gate of the first transistor; When the enable signal is input, the second transistor is turned on, thereby turning on the triode and the first transistor, so that the first transistor outputs a direct current signal with a first electrical parameter.
[0008] Furthermore, the source of the first transistor is connected to a start signal input, and the start signal input is also connected to a gate of the first transistor via a voltage divider resistor and a slow start capacitor connected in parallel; The enable signal input is connected to the source of the second transistor through an isolation diode; the source of the second transistor is also grounded through a voltage-stabilizing capacitor; the DC signal input with a second electrical parameter is connected to the gate of the second transistor; the gate of the second transistor is also grounded through a current-limiting resistor and a voltage-stabilizing capacitor in parallel; a current-limiting resistor is connected in series between the drain of the second transistor and the base of the transistor; The base of the transistor is also grounded through a transient voltage suppression diode and a voltage dividing resistor connected in parallel; the emitter of the transistor is grounded, and the collector is connected to the gate of the first transistor through a current limiting resistor.
[0009] Further, the voltage value of the enable signal input reaching the source of the second transistor is greater than the turn-on voltage value of the second transistor; After the enable signal outputted by the gate of the second transistor is divided by the current limiting resistor and the voltage dividing resistor, the base voltage value reaching the base of the transistor is greater than the conduction voltage value of the transistor; After the start signal input is divided by the current limiting resistor and the voltage dividing resistor, when the difference between the gate voltage and the source voltage reaches the gate of the first transistor, the difference is greater than the on-voltage value of the first transistor; After the DC signal with the second electrical parameter is divided by the current limiting resistor, the difference between the voltage value reaching the gate of the second transistor and the voltage value of the enable signal input reaching the source of the second transistor is less than the on-voltage value of the second transistor.
[0010] Furthermore, the second module includes a step-down chip and a slow-start circuit; One end of the slow start circuit is connected to the enable signal, and the other end is connected to the buck chip; when the buck chip receives the enable signal passing through the slow start circuit, it outputs a direct current signal with second electrical parameters, and at the same time outputs a direct current signal with second electrical parameters to the second transistor to control the second transistor to disconnect, thereby disconnecting the triode and the first transistor, so that the first module stops outputting the direct current signal with the first electrical parameters.
[0011] Furthermore, after the enable signal input is divided by the current limiting resistor and the voltage dividing resistor, the voltage value reaching the enable pin of the buck chip is greater than the enable voltage of the buck chip.
[0012] Furthermore, the power input pin of the step-down chip is connected to the start signal input, and the power input pin is also grounded through three input capacitors and a voltage regulator diode connected in parallel; The enable signal input is connected to the enable pin of the buck chip after passing through the current limiting resistor, reverse diodes are connected in parallel on both sides of the current limiting resistor, and the enable pin is also grounded through a parallel voltage stabilizing capacitor, a transient voltage suppression diode and a voltage divider resistor; The pad pin and the ground pin of the buck chip are grounded; The bootstrap pin of the step-down chip is connected to a bootstrap capacitor, and the switch tube is controlled to be turned on by the bootstrap capacitor; The switch pin of the buck chip is connected between the bootstrap capacitor and the output inductor, and when the switch tube is turned on, an electrical signal is output to the output inductor; the switch pin of the buck chip is also grounded through a freewheeling diode; The feedback pin of the buck chip is connected to the end of the output inductor away from the bootstrap pin through a voltage divider resistor and a feedforward capacitor connected in parallel; the feedback pin of the buck chip is also grounded through a voltage divider resistor; The output inductor is used to provide a direct current signal output having a second electrical parameter, and one end of the output inductor away from the bootstrap pin is also grounded through two output capacitors connected in parallel.
[0013] Furthermore, the preset slow start time is the time it takes for the voltage on the enable pin of the buck chip to rise to the rated enable voltage value; it is calculated based on the current limiting resistor, voltage stabilizing capacitor, voltage divider resistor connected to the enable pin of the buck chip and the rated enable voltage of the buck chip.
[0014] Furthermore, the gating module receives a DC signal input having a first electrical parameter and a DC signal input having a second electrical parameter respectively through two diodes, and selects the DC signal having a larger electrical parameter through the diodes to output to the solenoid valve; The gating module has voltage stabilizing diodes connected in parallel at both ends of the solenoid valve; one end of the solenoid valve away from the DC signal input is grounded.
[0015] Furthermore, the preset slow start time is greater than the start time of the solenoid valve; the power value of the DC signal with the first electrical parameter is greater than the start power value of the solenoid valve; the power value of the DC signal with the second electrical parameter is greater than the operating power value of the solenoid valve, and less than the start power value of the solenoid valve.
[0016] A second aspect of the present invention discloses a solenoid valve motion control method for controlling the solenoid valve motion control circuit, comprising the following steps: Providing a start signal input and an enable signal input to the first module and the second module respectively; After receiving the start signal input and the enable signal input, the first module generates a direct current signal output having a first electrical parameter; Inputting the direct current signal having the first electrical parameter into a gating module; The gating module controls the solenoid valve to start through the DC signal with the first electrical parameter; The second module receives a start signal input and an enable signal input, and after a preset slow start time, generates a direct current signal output having a second electrical parameter; Inputting the DC signal having the second electrical parameter into the gating module and the first module; The first module stops outputting the direct current signal with the first electrical parameter through the direct current signal with the second electrical parameter; The gating module controls the solenoid valve to maintain operation through the direct current signal with the second electrical parameter.
[0017] Furthermore, the second module receives a start signal input and an enable signal input, and after a preset slow start time, generates a direct current signal output having a second electrical parameter; specifically comprising: The time when the enable voltage input reaches the enable pin of the buck chip is delayed by a preset slow start time through the current limiting resistor and the voltage stabilizing capacitor connected to the enable pin of the buck chip.
[0018] Furthermore, the first module stops outputting the direct current signal with the first electrical parameter through the direct current signal with the second electrical parameter; specifically comprising: Turning off the second transistor by the direct current signal having the second electrical parameter; After the second transistor is turned off, the triode is turned off because the base loses the enable signal input; After the triode is turned off, the first transistor is turned off because the voltage difference between the source and the gate is less than the turn-on voltage of the first transistor, and the first module stops outputting the direct current signal with the first electrical parameter.
[0019] The embodiments of the present invention have the following beneficial effects: the present invention utilizes the characteristic that the solenoid valve maintenance voltage is less than the starting voltage, and through the control of the enable signal, a DC signal with a larger electrical parameter is given to start the solenoid valve when the solenoid valve is started; after the solenoid valve is started, a DC signal with a smaller electrical parameter is given to maintain the solenoid valve in an open state. The present invention can effectively reduce the power consumption and heat generation of the solenoid valve during operation, and ensure the long-term stable operation of the solenoid valve. The present invention ensures the working reliability of the solenoid valve while achieving low-temperature energy saving, and is widely used in various industrial automation fields.
[0020] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0022] Figure 1 It is a schematic diagram of the overall structure of a solenoid valve action control circuit of the present invention.
[0023] Figure 2 It is a schematic diagram of the circuit structure of the first module in the solenoid valve action control circuit of the present invention.
[0024] Figure 3 It is a schematic diagram of the circuit structure of the second module in the solenoid valve action control circuit of the present invention.
[0025] Figure 4 It is a schematic diagram of the circuit structure of the third module in the solenoid valve action control circuit of the present invention. DETAILED DESCRIPTION
[0026] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.
[0027] The first embodiment of the present invention provides a solenoid valve operation control circuit, such as Figure 1As shown, it includes: a first module, a second module and a gating module. The first module is used to output a DC signal with a first electrical parameter when receiving an enable signal input; the second module is used to output a DC signal with a second electrical parameter after a preset slow start time when receiving an enable signal input, and at the same time output a DC signal with the second electrical parameter to the first module, so that the first module stops outputting the DC signal with the first electrical parameter; the gating module is used to select one of the DC signal with the first electrical parameter and the DC signal with the second electrical parameter to pass according to a preset condition, so that the solenoid valve performs different actions to drive the solenoid valve.
[0028] The control electrical signal of the solenoid valve in the embodiment of the present invention includes a direct current signal with a first electrical parameter generated by the first module and a direct current signal with a second electrical parameter generated by the second module. Among them, the direct current signal with the first electrical parameter is greater than the direct current signal with the second electrical parameter. Since the internal magnetic circuit of the solenoid valve becomes shorter and the magnetic resistance becomes smaller after the solenoid valve is opened, the maintenance voltage required to maintain the opening of the solenoid valve is smaller than the starting voltage for driving the solenoid valve to open. Therefore, the embodiment of the present invention first drives the solenoid valve to open through a direct current signal with a larger electrical parameter. After a preset slow start time, the open state of the solenoid valve is maintained by a direct current signal with a smaller electrical parameter, and at the same time, the output of the direct current signal with a larger electrical parameter is shut down, thereby achieving energy saving and protection of the solenoid valve.
[0029] Specifically, the first module in the embodiment of the present invention is as follows: Figure 2 As shown. The first module includes a first transistor Q1, a second transistor Q2 and a triode Q3. The second transistor Q2 receives an enable signal, the drain of the second transistor Q2 is connected to the base of the triode Q3, and the collector of the triode Q3 is connected to the gate of the first transistor Q1; when the enable signal is input, the second transistor Q2 is turned on, and then the triode Q3 and the first transistor Q1 are turned on, so that the first transistor Q1 outputs a DC signal with a first electrical parameter.
[0030] In the embodiment of the present invention, the on and off of the first transistor Q1, the second transistor Q2 and the triode Q3 are controlled by the enable signal and the direct current signal output by the second module. The first transistor Q1, the second transistor Q2 and the triode Q3 are initially in the off state. After the enable signal is input to the first module, the enable signal is connected to the source of the second transistor Q2 through the isolation diode D5. The function of the isolation diode D5 here is to isolate the influence of the circuit abnormality on the enable signal. At the same time, the source of the second transistor Q2 is also grounded through the voltage stabilizing capacitor C10, and the voltage stabilizing capacitor C10 plays a filtering and voltage stabilizing role. After the enable signal input reaches the source of the second transistor Q2, if the voltage value of the enable signal U EN Greater than the turn-on voltage value of the second transistor Q2 |U Q2gs(on )|, the second transistor is turned on: .
[0031] After the second transistor Q2 is turned on, the enable signal outputted from the gate of the second transistor Q2 reaches the base of the transistor Q3 after being divided by the current limiting resistor R7 and the voltage dividing resistor R8. At the same time, the base of the transistor Q3 is also grounded through the transient voltage suppression diode D6, and the transistor Q3 is protected by the transient voltage suppression diode D6. If the base voltage value reaching the base of the transistor Q3 is U base Greater than the transistor's conduction voltage U Q3(on) , then transistor Q3 is turned on: U base > U Q3(on) .
[0032] After the transistor Q3 is turned on, the start signal input will reach the source of the first transistor Q1, and at the same time, the start signal input is also connected to the gate of the first transistor through the parallel voltage divider resistor R5 and the slow start capacitor C9. When the transistor Q3 is turned on, the start voltage input will pass through the current limiting resistor R6 to the ground. If the start voltage input reaches the gate of the first transistor Q1 after voltage division, the difference between the gate voltage and the source voltage of the first transistor Q1 will be U gs is greater than the turn-on voltage value of the first transistor Q1 | U Q1gs(on) |: U gs >| U Q1gs(on) |.
[0033] At this time, the first transistor Q1 is turned on, and outputs a direct current signal with a first electrical parameter to the selection module through the drain, driving the solenoid valve to open.
[0034] In the embodiment of the present invention, the first transistor Q1 and the second transistor Q2 are preferably enhancement-type NMOS transistors, and the transistor Q3 is preferably an NPN transistor.
[0035] In the embodiment of the present invention, the second module is as follows Figure 3As shown, it includes a buck chip U1 and a slow start circuit. One end of the slow start circuit is connected to the enable signal, and the other end is connected to the buck chip U1; when the buck chip U1 receives the enable signal through the slow start circuit, it outputs a DC signal with a second electrical parameter, and at the same time outputs a DC signal with the second electrical parameter to the second transistor Q2, so as to control the second transistor Q2 to disconnect, thereby disconnecting the triode Q3 and the first transistor Q1, so that the first module stops outputting the DC signal with the first electrical parameter.
[0036] In the embodiment of the present invention, a slow start circuit is formed by a current limiting resistor R3 and a voltage stabilizing capacitor C8. The enable signal reaches the enable pin of the buck chip U1 after a preset slow start time. At the same time, the enable pin of the buck chip U1 is also grounded through a transient voltage suppression diode D4 and a current limiting resistor R4. The transient voltage suppression diode protects the buck chip U1 and the voltage divider resistor R4 plays a voltage divider pull-down role. If the voltage value of the enable signal reaching the enable pin of the buck chip after the voltage is divided by resistors R3 and R4, Greater than the enable voltage of the buck chip , then the buck chip U1 starts: .
[0037] After the buck chip U1 is started, the switch tube is turned on; after the start signal enters the buck chip U1 through the power input pin, the bootstrap capacitor is connected to the bootstrap pin to control the switch tube to conduct, and an electrical signal is output from the switch pin to the output inductor L1, so that the load of the output inductor L1 gradually increases. The load pin of the buck chip U1 is connected to the end of the output inductor L1 away from the bootstrap pin. After the load of the output inductor L1 reaches the set upper limit, the switch pin is closed, and the electrical signal output is provided through the current in the output inductor L1; after the load of the output inductor L1 reaches the set lower limit, the switch pin is reopened to provide the electrical signal output. The buck chip U1 repeatedly switches the switch pin through the feedback pin to achieve a DC step-down output of the electrical signal, and outputs a DC electrical signal with a second electrical parameter.
[0038] After the DC signal of the second electrical parameter reaches the first module, a negative voltage difference appears between the source and the gate of the second transistor Q2, causing the second transistor Q2 to turn off. After the second transistor Q2 is turned off, there is no enable signal input to the base of the transistor Q3, and the transistor Q3 is turned off. After the transistor Q3 is turned off, a negative voltage difference appears between the source and the gate of the first transistor Q1, and the first transistor is turned off. Ultimately, the DC signal output by the first module is zero, and the solenoid valve uses the DC signal output by the second module to maintain the solenoid valve open state.
[0039] In addition, the power input pin of the buck chip U1 is also grounded through three parallel input capacitors C2, C3, C4 and a voltage regulator diode D1; the input capacitor plays a role in filtering and voltage stabilization. A reverse diode D3 is connected in parallel on both sides of the current limiting resistor R3 as a fast voltage discharge path; the switch pin of the buck chip is grounded through a freewheeling diode D2, which protects the buck chip U1; the feedback pin of the buck chip U1 is also grounded through a voltage divider resistor R2; the end of the output inductor away from the bootstrap pin is also grounded through two parallel output capacitors C6 and C7, and the output capacitor plays a role in filtering and voltage stabilization.
[0040] As a preferred embodiment, the slow start time is preset T ss It is the time for the voltage on the enable pin of the buck chip U1 to rise to the rated enable voltage value; the current limiting resistor R3, the voltage stabilizing capacitor C8, the voltage divider resistor R4 connected to the enable pin of the buck chip U1 and the rated enable voltage of the buck chip U U1en The calculation results are: .
[0041] In addition, the preset slow start time is designed T ss Need to be longer than the DC solenoid valve opening time , to ensure the stable operation of the DC solenoid valve: .
[0042] At the same time, the power of the DC signal with the first electrical parameter is greater than the starting power value of the solenoid valve; the power value of the DC signal with the second electrical parameter is greater than the operating power value of the solenoid valve and less than the starting power value of the solenoid valve, ensuring that the DC signal can drive the solenoid valve to open or maintain the solenoid valve in an open state.
[0043] In the embodiment of the present invention, the gating module is as follows Figure 4 The gating module receives a DC signal input having a first electrical parameter and a DC signal input having a second electrical parameter through two diodes D7 and D8, respectively, and selects the DC signal having a larger electrical parameter through the diode to output to the solenoid valve.
[0044] The selection module has a voltage-stabilizing diode D9 connected in parallel at both ends of the solenoid valve; one end of the solenoid valve away from the DC signal input is grounded.
[0045] The embodiment of the present invention can not only make the DC solenoid valve act quickly through the above-mentioned electrical signal switching control, but also greatly reduce the static power consumption of the DC solenoid valve, greatly improve the heating situation, ensure the long-term stable operation of the solenoid valve, achieve low-temperature energy saving, and ensure the working reliability of the solenoid valve.
[0046] The second embodiment of the present invention discloses a solenoid valve motion control method, which is used to control the solenoid valve motion control circuit of the first embodiment, and includes the following steps: S1. Provide a start signal input and an enable signal input to the first module and the second module respectively; S2. After receiving the start signal input and the enable signal input, the first module generates a DC signal output having a first electrical parameter; S3. Inputting a DC signal having a first electrical parameter into a gating module; S4. The gating module controls the solenoid valve to start by a DC signal having a first electrical parameter; S5. The second module receives the start signal input and the enable signal input, and after a preset slow start time, generates a DC signal output having a second electrical parameter; S6. Inputting a DC signal having a second electrical parameter into the gating module and the first module; S7. The first module stops outputting the DC signal having the first electrical parameter through the DC signal having the second electrical parameter; S8. The gating module controls the solenoid valve to maintain operation through a DC signal with a second electrical parameter.
[0047] Specifically, the second module receives the start signal input and the enable signal input, and after a preset slow start time, generates a direct current signal output with a second electrical parameter; this is specifically achieved through the following operations: The time required for the voltage on the enable pin of the buck chip to rise to the rated enable voltage value through the current limiting resistor and the voltage stabilizing capacitor connected to the enable pin of the buck chip is the preset slow start time.
[0048] Specifically, in step S7, the first module stops outputting the direct current signal with the first electrical parameter through the direct current signal with the second electrical parameter; specifically comprising: S7-1. Turning off the second transistor by a DC signal having a second electrical parameter; S7-2. After the second transistor is turned off, the transistor is turned off because the base loses the enable signal input; S7-3. After the transistor is turned off, the first transistor is turned off because the voltage difference between the source and the gate is less than the turn-on voltage of the first transistor, and the first module stops outputting a DC signal with the first electrical parameters.
[0049] Those skilled in the art will appreciate that the modules in the devices in the embodiments of the present invention may be adaptively changed and arranged in one or more devices different from the embodiments. The modules or units or components in the embodiments of the present invention may be combined into one module or unit or component, and in addition they may be divided into a plurality of submodules or subunits or subcomponents. Except that at least some of such features and / or processes or units are mutually exclusive, all features disclosed in this specification (including the corresponding claims, abstracts and drawings) and all processes or units of any method or device disclosed in this manner may be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the corresponding claims, abstracts and drawings) may be replaced by an alternative feature providing the same, equivalent or similar purpose.
[0050] Through the description of the above implementation methods, technical personnel in the relevant field can understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.
[0051] In addition, each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other. In particular, for embodiments such as devices and equipment, since they are basically similar to method embodiments, the relevant parts can refer to the partial description of the method embodiments. The embodiments of the devices and equipment described above are merely schematic, wherein the modules, units, etc. described as separate components may or may not be physically separated, that is, they may be located in one place, or they may be distributed in multiple places, such as nodes of a system network. Specifically, some or all of the modules and units may be selected according to actual needs to achieve the purpose of the above-mentioned embodiment scheme. Those skilled in the art can understand and implement it without paying creative labor.
[0052] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.
[0053] In addition, the terms "first", "second", etc. used in the embodiments of the present invention are only used for descriptive purposes and should not be understood as indicating or implying relative importance, or implicitly indicating the number of technical features indicated in the present embodiment. Therefore, the features defined by the terms "first", "second", etc. in the embodiments of the present invention can explicitly or implicitly indicate that the embodiment includes at least one of the features. In the description of the present invention, the word "multiple" means at least two or two or more, such as two, three, four, etc., unless otherwise clearly and specifically defined in the embodiments.
[0054] In the embodiments of the present invention, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element. In addition, components, features, and elements with the same name in different embodiments of the present invention may have the same meaning or different meanings, and their specific meanings need to be determined by their explanation in the specific embodiment or further combined with the context in the specific embodiment.
[0055] Although embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and cannot be construed as limitations of the present invention, and those of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present invention. Those skilled in the art will readily come to think of other embodiments of the present invention after considering the specification and practicing the present invention. This application is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary technical means in the art that are not disclosed in the present invention. The specification and embodiments are intended to be exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.
Claims
1. A solenoid valve action control circuit, characterized in that: include: A first module, a second module and a gating module; The first module is used to output a direct current signal having a first electrical parameter when receiving an enable signal input; The second module is used to output a direct current signal with second electrical parameters after a preset slow start time when receiving an enable signal input, and simultaneously output a direct current signal with second electrical parameters to the first module, so that the first module stops outputting the direct current signal with first electrical parameters; The gating module is used to select one of the DC signal with the first electrical parameter and the DC signal with the second electrical parameter to pass according to a preset condition, so that the solenoid valve performs different actions; The direct current signal with the first electrical parameter is greater than the direct current signal with the second electrical parameter.
2. The solenoid valve action control circuit according to claim 1, characterized in that: The first module includes a first transistor, a second transistor and a triode; Wherein, the second transistor receives an enable signal, the drain of the second transistor is connected to the base of the transistor, and the collector of the transistor is connected to the gate of the first transistor; When the enable signal is input, the second transistor is turned on, thereby turning on the triode and the first transistor, so that the first transistor outputs a direct current signal with a first electrical parameter.
3. The solenoid valve action control circuit according to claim 2, characterized in that: The source of the first transistor is connected to the start signal input, and the start signal input is also connected to the gate of the first transistor through a voltage divider resistor and a slow start capacitor connected in parallel; The enable signal input is connected to the source of the second transistor through an isolation diode; the source of the second transistor is also grounded through a voltage-stabilizing capacitor; the DC signal input with a second electrical parameter is connected to the gate of the second transistor; the gate of the second transistor is also grounded through a current-limiting resistor and a voltage-stabilizing capacitor in parallel; a current-limiting resistor is connected in series between the drain of the second transistor and the base of the transistor; The base of the transistor is also grounded through a transient voltage suppression diode and a voltage dividing resistor connected in parallel; the emitter of the transistor is grounded, and the collector is connected to the gate of the first transistor through a current limiting resistor.
4. The solenoid valve action control circuit according to claim 2, characterized in that: The voltage value of the enable signal input reaching the source of the second transistor is greater than the turn-on voltage value of the second transistor; After the enable signal outputted by the gate of the second transistor is divided by the current limiting resistor and the voltage dividing resistor, the base voltage value reaching the base of the transistor is greater than the conduction voltage value of the transistor; After the start signal input is divided by the current limiting resistor and the voltage dividing resistor, when the difference between the gate voltage and the source voltage reaches the gate of the first transistor, the difference is greater than the on-voltage value of the first transistor; After the DC signal with the second electrical parameter is divided by the current limiting resistor, the difference between the voltage value reaching the gate of the second transistor and the voltage value of the enable signal input reaching the source of the second transistor is less than the on-voltage value of the second transistor.
5. The solenoid valve action control circuit according to claim 2, characterized in that: The second module includes a step-down chip and a slow-start circuit; One end of the slow start circuit is connected to the enable signal, and the other end is connected to the buck chip; when the buck chip receives the enable signal passing through the slow start circuit, it outputs a direct current signal with second electrical parameters, and at the same time outputs a direct current signal with second electrical parameters to the second transistor to control the second transistor to disconnect, thereby disconnecting the triode and the first transistor, so that the first module stops outputting the direct current signal with the first electrical parameters.
6. The solenoid valve action control circuit according to claim 5, characterized in that: After the enable signal input is divided by the current limiting resistor and the voltage dividing resistor, the voltage value reaching the enable pin of the buck chip is greater than the enable voltage value of the buck chip.
7. The solenoid valve action control circuit according to claim 5, characterized in that: The power input pin of the step-down chip is connected to the start signal input, and the power input pin is also grounded through three input capacitors and a voltage regulator diode connected in parallel; The enable signal input is connected to the enable pin of the buck chip after passing through the current limiting resistor, reverse diodes are connected in parallel on both sides of the current limiting resistor, and the enable pin is also grounded through a parallel voltage stabilizing capacitor, a transient voltage suppression diode and a voltage divider resistor; The pad pin and the ground pin of the buck chip are grounded; The bootstrap pin of the step-down chip is connected to a bootstrap capacitor, and the switch tube is controlled to be turned on by the bootstrap capacitor; The switch pin of the buck chip is connected between the bootstrap capacitor and the output inductor, and when the switch tube is turned on, an electrical signal is output to the output inductor; the switch pin of the buck chip is also grounded through a freewheeling diode; The feedback pin of the buck chip is connected to the end of the output inductor away from the bootstrap pin through a voltage divider resistor and a feedforward capacitor connected in parallel; the feedback pin of the buck chip is also grounded through a voltage divider resistor; The output inductor is used to provide a direct current signal output having a second electrical parameter; one end of the output inductor away from the bootstrap pin is also grounded through two output capacitors connected in parallel.
8. The solenoid valve action control circuit according to claim 7, characterized in that: The preset slow start time is the time it takes for the voltage on the enable pin of the buck chip to rise to the rated enable voltage value; it is calculated based on the current limiting resistor, voltage stabilizing capacitor, voltage divider resistor connected to the enable pin of the buck chip and the rated enable voltage of the buck chip.
9. The solenoid valve action control circuit according to claim 1, characterized in that: The gating module receives a DC signal input having a first electrical parameter and a DC signal input having a second electrical parameter through two diodes, respectively, and selects the DC signal having a larger electrical parameter through the diodes to output to the solenoid valve; The gating module has voltage stabilizing diodes connected in parallel at both ends of the solenoid valve; one end of the solenoid valve away from the DC signal input is grounded.
10. The solenoid valve action control circuit according to claim 9, characterized in that: The preset slow start time is greater than the start time of the solenoid valve; the power value of the DC signal with the first electrical parameter is greater than the start power value of the solenoid valve; the power value of the DC signal with the second electrical parameter is greater than the operating power value of the solenoid valve and less than the start power value of the solenoid valve.
11. A solenoid valve motion control method, used to control the solenoid valve motion control circuit according to any one of claims 1 to 10, characterized in that: The following steps are involved: Providing a start signal input and an enable signal input to the first module and the second module respectively; After receiving the start signal input and the enable signal input, the first module generates a direct current signal output having a first electrical parameter; Inputting the direct current signal having the first electrical parameter into a gating module; The gating module controls the solenoid valve to start through the DC signal with the first electrical parameter; The second module receives a start signal input and an enable signal input, and after a preset slow start time, generates a direct current signal output having a second electrical parameter; Inputting the DC signal having the second electrical parameter into the gating module and the first module; The first module stops outputting the direct current signal with the first electrical parameter through the direct current signal with the second electrical parameter; The gating module controls the solenoid valve to maintain operation through the direct current signal with the second electrical parameter.
12. A solenoid valve action control method according to claim 11, characterized in that: The second module receives a start signal input and an enable signal input, and after a preset slow start time, generates a direct current signal output with a second electrical parameter; specifically comprising: The time required for the voltage on the enable pin of the buck chip to rise to the rated enable voltage value through the current limiting resistor and the voltage stabilizing capacitor connected to the enable pin of the buck chip is the preset slow start time.
13. The solenoid valve action control method according to claim 11, characterized in that: The first module stops outputting the direct current signal with the first electrical parameter through the direct current signal with the second electrical parameter; specifically comprising: Turning off the second transistor by the direct current signal having the second electrical parameter; After the second transistor is turned off, the triode is turned off because the base loses the enable signal input; After the triode is turned off, the first transistor is turned off because the voltage difference between the source and the gate is less than the turn-on voltage of the first transistor, and the first module stops outputting the direct current signal with the first electrical parameter.