Miniature electromagnetic valve control circuit and electronic equipment

Abstract

The utility model relates to the technical field of equipment control, in particular to a miniature electromagnetic valve control circuit and electronic equipment. The circuit comprises a current detection unit, a cut-off protection unit and a micro electromagnetic valve, a first interface of the micro electromagnetic valve is connected with a power supply, a second interface of the micro electromagnetic valve is connected with a first end of the cut-off protection unit, a second end of the cut-off protection unit is connected with a first end of the current detection unit, a second end of the current detection unit is grounded, and a third end of the current detection unit is connected with a third end of the cut-off protection unit; the current detection unit collects the working current of the micro electromagnetic valve and outputs a low-level protection enable signal to the cut-off protection unit when the amplitude of the working current exceeds a preset working threshold value; and when the cut-off protection unit receives the low-level protection enable signal, the power supply loop of the micro electromagnetic valve is cut off. The miniature electromagnetic valve is protected by cutting off a current loop of the miniature electromagnetic valve when the working current is abnormal.

Description

Technical Field

[0001] This utility model relates to the field of equipment control technology, and in particular to a miniature solenoid valve control circuit and electronic device. Background Technology

[0002] A miniature solenoid valve is a small, high-frequency electromagnetic control actuator used to control the opening and closing of liquids or high-pressure gases. When used in confined spaces, improper control methods or abnormal control circuits can cause the miniature solenoid valve to remain continuously open, resulting in continuous heat generation. If the temperature exceeds the device's specified operating temperature, the lifespan of the miniature solenoid valve will be significantly reduced or it may even be damaged.

[0003] Due to their extremely fast switching speed, miniature solenoid valves are crucial for refrigerant gas control in high-frequency output devices. Rapid switching allows for precise control of refrigerant flow to adapt to varying load requirements. Abnormal refrigerant pulse output (e.g., output not following preset conduction rules, continuous abnormal output, or microcontroller program malfunction) may cause a faulty refrigerant output from the coolant pump to the treatment handpiece.

[0004] The above content is only used to help understand the technical solution of this utility model and does not represent an admission that the above content is prior art. Utility Model Content

[0005] The main purpose of this invention is to provide a miniature solenoid valve control circuit and electronic device, which aims to solve the technical problem of the lack of protection measures against abnormal output failures of miniature solenoid valves in the prior art.

[0006] To achieve the above objectives, this utility model provides a miniature solenoid valve control circuit, which includes: a current detection unit, a cut-off protection unit, and a miniature solenoid valve;

[0007] The first interface of the miniature solenoid valve is connected to the power supply, the second interface of the miniature solenoid valve is connected to the first end of the cut-off protection unit, the second end of the cut-off protection unit is connected to the first end of the current detection unit, the second end of the current detection unit is grounded, and the third end of the current detection unit is connected to the third end of the cut-off protection unit.

[0008] The current detection unit is used to collect the operating current of the miniature solenoid valve, and when the amplitude of the operating current exceeds a preset operating threshold, it outputs a low-level protection enable signal to the cut-off protection unit.

[0009] The cut-off protection unit is used to disconnect the power supply circuit of the miniature solenoid valve when it receives a low-level protection enable signal.

[0010] Optionally, the cut-off protection unit includes: a first switching transistor;

[0011] The first end of the first switching transistor is connected to the second interface of the miniature solenoid valve, the second end of the first switching transistor is connected to the first end of the current detection unit, and the third end of the first switching transistor is connected to the third end of the current detection unit.

[0012] Optionally, the current detection unit includes: a first resistor and a comparator;

[0013] The first end of the first resistor is connected to both the second end of the first switching transistor and the first end of the comparator. The second end of the first resistor is grounded. The second end of the comparator receives a preset current comparison signal. The second end of the comparator is connected to the third end of the first switching transistor.

[0014] Optionally, the miniature solenoid valve control circuit further includes: a first diode;

[0015] The cathode of the first diode is connected to the first interface of the miniature solenoid valve, and the anode of the first diode is connected to the first end of the first switching transistor.

[0016] Optionally, the miniature solenoid valve control circuit further includes: an on / off control unit;

[0017] The first terminal of the on / off control unit is connected to the power supply, the second terminal of the on / off control unit is connected to the first interface of the miniature solenoid valve, and the third terminal of the on / off control unit receives the on / off enable signal.

[0018] The on / off control unit is used to turn on the power supply circuit from the power supply to the miniature solenoid valve when a high-level on / off enable signal is received, and to disconnect the power supply circuit from the power supply to the miniature solenoid valve when a low-level on / off enable signal is received.

[0019] Optionally, the on / off control unit includes: an on subunit and a sustaining subunit;

[0020] The power supply includes a first voltage source and a second voltage source, and the on / off enable signal includes a first voltage source enable signal and a second voltage source enable signal, wherein the voltage amplitude of the first voltage source is greater than the voltage amplitude of the second voltage source.

[0021] The first end of the opening subunit is connected to the first voltage source, the second end of the opening subunit is connected to the first interface of the miniature solenoid valve, and the third end of the opening subunit receives the first voltage source enable signal. The first end of the sustaining subunit is connected to the second voltage source, the second end of the sustaining subunit is connected to the first interface of the miniature solenoid valve, and the third end of the sustaining subunit receives the second voltage source enable signal.

[0022] The opening subunit is used to turn on the power supply circuit from the first voltage source to the micro solenoid valve when a high-level first voltage source enable signal is received, thereby driving the micro solenoid valve to enter the open state.

[0023] The sustaining subunit is used to conduct the power supply circuit of the second voltage source to the miniature solenoid valve when a high-level second voltage source enable signal is received, thereby maintaining the open state of the miniature solenoid valve.

[0024] Optionally, the switching subunit includes: a second to a fourth resistor, a first capacitor, a second switching transistor, and a third switching transistor;

[0025] The first end of the second resistor is simultaneously connected to the first end of the first capacitor, the first end of the second switching transistor, and the first voltage source. The second end of the second resistor is simultaneously connected to the second end of the first capacitor, the third end of the second switching transistor, and the first end of the third switching transistor. The second end of the second switching transistor is connected to the first interface of the miniature solenoid valve. The third end of the third switching transistor is simultaneously connected to the first end of the third resistor and the first end of the fourth resistor. The second end of the third resistor receives the first voltage source enable signal. The second end of the third switching transistor is connected to the second end of the fourth resistor and grounded.

[0026] Optionally, the sustaining subunit includes: a fifth to a seventh resistor, a second capacitor, a fourth switch, and a fifth switch;

[0027] The first end of the fifth resistor is simultaneously connected to the first end of the second capacitor, the first end of the fourth switch, and the second voltage source. The second end of the fifth resistor is simultaneously connected to the second end of the second capacitor, the third end of the fourth switch, and the first end of the fifth switch. The second end of the fourth switch is connected to the first interface of the miniature solenoid valve. The third end of the fifth switch is simultaneously connected to the first end of the sixth resistor and the first end of the seventh resistor. The second end of the sixth resistor receives the enable signal from the second voltage source. The second end of the fifth switch is connected to the second end of the seventh resistor and grounded.

[0028] Optionally, the miniature solenoid valve control circuit further includes: a second diode;

[0029] The cathode of the second diode is connected to the first interface of the miniature solenoid valve, and the anode of the second diode is connected to the second end of the fourth switching transistor.

[0030] In addition, to achieve the above objectives, this utility model also provides an electronic device, which includes: the miniature solenoid valve control circuit described above.

[0031] This utility model provides a miniature solenoid valve control circuit and electronic device. The miniature solenoid valve control circuit includes: a current detection unit, a cut-off protection unit, and a miniature solenoid valve. The first interface of the miniature solenoid valve is connected to a power supply; the second interface of the miniature solenoid valve is connected to the first end of the cut-off protection unit; the second end of the cut-off protection unit is connected to the first end of the current detection unit, the second end of the current detection unit is grounded, and the third end of the current detection unit is connected to the third end of the cut-off protection unit. The current detection unit collects the operating current of the miniature solenoid valve and outputs a low-level protection enable signal to the cut-off protection unit when the amplitude of the operating current exceeds a preset operating threshold. The cut-off protection unit disconnects the power supply circuit of the miniature solenoid valve upon receiving the low-level protection enable signal. By cutting off the current circuit of the miniature solenoid valve when the operating current is abnormal, the protection of the miniature solenoid valve is achieved, forcibly cutting off the channel from the coolant pump to the treatment handle, thus enhancing the stability of the device operation. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of the first embodiment of the miniature solenoid valve control circuit of this utility model;

[0034] Figure 2 This is a circuit connection diagram of the second embodiment of the miniature solenoid valve control circuit of this utility model;

[0035] Figure 3 This is a schematic diagram of the third embodiment of the miniature solenoid valve control circuit of this utility model;

[0036] Figure 4 This is a circuit connection diagram of the third embodiment of the miniature solenoid valve control circuit of this utility model;

[0037] Figure 5 This is a schematic diagram of the structure of an embodiment of the electronic device of this utility model;

[0038] Figure 6 This is a circuit connection diagram of an embodiment of the electronic device of this utility model.

[0039] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0040] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0042] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0043] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0044] Reference Figure 1 , Figure 1 This is a schematic diagram of the first embodiment of the miniature solenoid valve control circuit of this utility model. This utility model proposes a first embodiment of the miniature solenoid valve control circuit.

[0045] In this embodiment, the miniature solenoid valve control circuit includes: a current detection unit 10, a cut-off protection unit 20, and a miniature solenoid valve 30; the first end of the miniature solenoid valve 30 is connected to the power supply Vs, the second end of the miniature solenoid valve 30 is connected to the first end of the cut-off protection unit 20, the second end of the cut-off protection unit 20 is connected to the first end of the current detection unit 10, the second end of the current detection unit 10 is grounded, and the third end of the current detection unit 10 is connected to the third end of the cut-off protection unit 20.

[0046] It should be noted that the current detection unit 10 can be used to collect the operating current of the miniature solenoid valve, and when the amplitude of the operating current exceeds a preset operating threshold, output a low-level protection enable signal to the cut-off protection unit; the cut-off protection unit can be used to disconnect the power supply circuit of the miniature solenoid valve when it receives the low-level protection enable signal.

[0047] It should be understood that the miniature solenoid valve 30 controls the position of the valve core based on the operating current provided by the power supply, thereby achieving fluid control. The preset operating threshold can be the range of current amplitude fluctuation during the normal operation of the miniature solenoid valve in fluid output control. If an abnormal output condition occurs during the on and off processes of the miniature solenoid valve, the amplitude of the operating current will exceed the preset operating threshold. The protection enable signal can be a high or low level electrical signal; a high level indicates that no abnormal output condition has occurred, and a low level indicates that an abnormal output condition has occurred.

[0048] Furthermore, the current detection unit 10 can be an electronic device or circuit combination with current acquisition and signal output functions, capable of acquiring the operating current of the miniature solenoid valve and outputting a high-level or low-level protection enable signal according to the amplitude of the operating current. The cut-off protection unit 20 can be an electronic device or circuit combination with switching control capability, capable of conducting the power supply circuit of the miniature solenoid valve when the protection enable signal is high-level and disconnecting the power supply circuit of the miniature solenoid valve when the protection enable signal is low-level.

[0049] This embodiment proposes a miniature solenoid valve control circuit. The device includes a current detection unit, a cut-off protection unit, and a miniature solenoid valve. The first interface of the miniature solenoid valve is connected to a power supply, the second interface of the miniature solenoid valve is connected to the first terminal of the cut-off protection unit, the second terminal of the cut-off protection unit is connected to the first terminal of the current detection unit, the second terminal of the current detection unit is grounded, and the third terminal of the current detection unit is connected to the third terminal of the cut-off protection unit. The current detection unit is used to collect the operating current of the miniature solenoid valve and output a low-level protection enable signal to the cut-off protection unit when the amplitude of the operating current exceeds a preset operating threshold. The cut-off protection unit is used to disconnect the power supply circuit of the miniature solenoid valve upon receiving the low-level protection enable signal. By cutting off the current circuit of the miniature solenoid valve when the operating current is abnormal, the protection of the miniature solenoid valve is achieved, forcibly cutting off the channel from the coolant pump to the treatment handle, thus enhancing the stability of the device operation.

[0050] Reference Figure 2 , Figure 2 This is a circuit connection diagram of a second embodiment of the miniature solenoid valve control circuit of this utility model. Based on the first embodiment of the miniature solenoid valve control circuit described above, a second embodiment of the miniature solenoid valve control circuit of this utility model is proposed.

[0051] The cut-off protection unit 20 includes: a first switching transistor Q1; the first end of the first switching transistor Q1 is connected to the second end of the miniature solenoid valve 30, the second end of the first switching transistor Q1 is connected to the first end of the current detection unit 10, and the third end of the first switching transistor Q1 is connected to the third end of the current detection unit 10.

[0052] It should be noted that the first switching transistor Q1 can be a field-effect transistor or a bipolar transistor, and no specific limitation is made in this embodiment. The cut-off protection unit 20 can also be a relay as the switching control device.

[0053] Furthermore, the current detection unit 10 includes: a first resistor R1 and a comparator U1; the first end of the first resistor R1 is connected to both the second end of the first switch Q1 and the first end of the comparator U1, the second end of the first resistor R1 is grounded, the second first end of the comparator U1 receives a preset current comparison signal Vp, and the second end of the comparator U1 is connected to the third end of the first switch Q1.

[0054] It should be noted that the preset current comparison signal Vp can be a pre-set electrical signal used to determine whether the operating current is abnormal, and its amplitude can be set to the aforementioned preset operating threshold. In addition to a comparator, the current detection unit 10 can also use electronic devices with storage and processing capabilities, such as a microcontroller, to collect the current in the circuit. When the current does not exceed the pre-stored preset current comparison signal, it outputs a high-level protection enable signal to the third terminal of the first switching transistor; and when the current exceeds the pre-stored preset current comparison signal, it outputs a low-level protection enable signal to the third terminal of the first switching transistor.

[0055] It should be understood that after the system is powered on, the protection enable signal is first given to a high level, which opens the power supply circuit of the miniature solenoid valve by the first switching transistor. The current detection unit 10 collects the voltage on the first resistor and converts it into working current when the miniature solenoid valve is in the on and off states. It compares the voltage with the normal working current of the miniature solenoid valve by a comparator. If an abnormal working current of the miniature solenoid valve is detected, the first switching transistor is controlled to close by giving a low level protection enable signal, thereby cutting off the working circuit and protecting the miniature solenoid valve.

[0056] Furthermore, the miniature solenoid valve control circuit also includes: a first diode D1; the cathode of the first diode D1 is connected to the first end of the miniature solenoid valve 30, and the anode of the first diode D1 is connected to the first end of the first switching transistor Q1.

[0057] This embodiment includes a cutoff protection unit comprising a first switching transistor. The first end of the first switching transistor is connected to the second interface of the miniature solenoid valve, the second end of the first switching transistor is connected to the first end of the current detection unit, and the third end of the first switching transistor is connected to the third end of the current detection unit. A current detection unit comprising a first resistor and a comparator is also included. The first end of the first resistor is connected to both the second end of the first switching transistor and the first end of the comparator, and the second end of the first resistor is grounded. The second end of the comparator receives a preset current comparison signal, and the second end of the comparator is connected to the third end of the first switching transistor. By comparing the operating current of the miniature solenoid valve with the preset current comparison signal, the first switching transistor is shut off when the operating current is abnormal, thus protecting the miniature solenoid valve and forcibly cutting off the flow of coolant from the coolant pump to the treatment handle, enhancing the stability of the device operation.

[0058] Reference Figure 3 , Figure 3 This is a schematic diagram of the third embodiment of the miniature solenoid valve control circuit of this utility model. Based on the above embodiments of the miniature solenoid valve control circuit, a third embodiment of the miniature solenoid valve control circuit of this utility model is proposed.

[0059] In this embodiment, the micro solenoid valve control circuit further includes: an on / off control unit 40; the first terminal of the on / off control unit 40 is connected to the power supply Vs, the second terminal of the on / off control unit 40 is connected to the first terminal of the micro solenoid valve 30, and the third terminal of the on / off control unit 40 receives an on / off enable signal.

[0060] It should be noted that the on / off control unit 40 can be used to turn on the power supply circuit from the power source to the miniature solenoid valve when a high-level on / off enable signal is received, and to turn off the power supply circuit from the power source to the miniature solenoid valve when a low-level on / off enable signal is received. The on / off enable signal can be a control signal used to control the miniature solenoid valve, and thus control the coolant pump to output coolant to the treatment handle channel for on / off operation.

[0061] Furthermore, the on / off control unit 40 includes an on subunit 401 and a sustaining subunit 402; the power supply Vs includes a first voltage source VCC1 and a second voltage source VCC2; the on / off enable signal Vn includes a first voltage source enable signal Vn1 and a second voltage source enable signal Vn2; and the voltage amplitude of the first voltage source VCC1 is greater than the voltage amplitude of the second voltage source VCC2.

[0062] The first end of the activation subunit 401 is connected to the first voltage source VCC1, the second end of the activation subunit 401 is connected to the first end of the miniature solenoid valve 30, and the third end of the activation subunit 401 receives the first voltage source enable signal Vn1. The first end of the sustaining subunit 402 is connected to the second voltage source VCC2, the second end of the sustaining subunit 402 is connected to the first end of the miniature solenoid valve 30, and the third end of the sustaining subunit 402 receives the second voltage source enable signal Vn2.

[0063] It should be noted that the opening subunit 401 can be used to turn on the power supply circuit from the first voltage source to the miniature solenoid valve when a high-level first voltage source enable signal is received, thereby driving the miniature solenoid valve into the open state; the maintaining subunit 402 can be used to turn on the power supply circuit from the second voltage source to the miniature solenoid valve when a high-level second voltage source enable signal is received, thereby maintaining the open state of the miniature solenoid valve.

[0064] It should be understood that the micro solenoid valve 30 requires different voltage amplitudes when it is open and when it is maintained open. Therefore, a first voltage source with a higher voltage amplitude can be used to power the valve when it is open, while a second voltage source with a lower voltage amplitude can be used to power the valve when it is maintained open, in order to enhance the stability of the device operation.

[0065] Reference Figure 4 , Figure 4 The circuit connection diagram of the third embodiment of the micro electromagnetic valve control circuit of this utility model is shown. The opening sub-unit 401 includes: second to fourth resistors (refer to R2 to R4 in the figure), first capacitor C1, second switch Q2 and third switch Q3.

[0066] Specifically, the first end of the second resistor R2 is connected to the first end of the first capacitor C1, the first end of the second switch Q2, and the first voltage source VCC1. The second end of the second resistor R2 is connected to the second end of the first capacitor C1, the third end of the second switch Q2, and the first end of the third switch Q3. The second end of the second switch Q2 is connected to the first end of the miniature solenoid valve 30. The third end of the third switch Q3 is connected to the first end of the third resistor R3 and the first end of the fourth resistor R4. The second end of the third resistor R3 receives the first voltage source enable signal Vn1. The second end of the third switch Q3 is connected to the second end of the fourth resistor R4 and grounded.

[0067] Furthermore, the sustaining subunit 402 includes: fifth to seventh resistors (refer to R5 to R7 in the figure), second capacitor C2, fourth switch Q4 and fifth switch Q5.

[0068] Specifically, the first end of the fifth resistor R5 is simultaneously connected to the first end of the second capacitor C2, the first end of the fourth switch Q4, and the second voltage source VCC2. The second end of the fifth resistor R5 is simultaneously connected to the second end of the second capacitor C2, the third end of the fourth switch Q4, and the first end of the fifth switch Q5. The second end of the fourth switch Q4 is connected to the first end of the miniature solenoid valve 30. The third end of the fifth switch Q5 is simultaneously connected to the first end of the sixth resistor R6 and the first end of the seventh resistor R7. The second end of the sixth resistor R6 receives the second voltage source enable signal Vn2. The second end of the fifth switch Q5 is connected to the second end of the seventh resistor R7 and grounded.

[0069] It should be noted that when the first voltage source enable signal is high, the second and third switches are turned on, and the first voltage source powers the miniature solenoid valve. After the miniature solenoid valve is stably open, the first voltage source enable signal goes low, the second voltage source enable signal goes high, the fourth and fifth switches are turned on, and the second voltage source continues to power the miniature solenoid valve to maintain its open state. When both the first and second voltage source enable signals are low, the second to fifth switches are all turned off, and the miniature solenoid valve is de-energized and closes.

[0070] It should be understood that the aforementioned switching transistor can be any electronic device with switching control capability, such as a transistor, field-effect transistor, or relay, and no specific restrictions are imposed in this embodiment.

[0071] Furthermore, the miniature solenoid valve control circuit also includes a second diode D2; the cathode of the second diode D2 is connected to the first end of the miniature solenoid valve 30, and the anode of the second diode D2 is connected to the second end of the fourth switching transistor Q4.

[0072] In this embodiment, the miniature solenoid valve control circuit further includes an on / off control unit; the first terminal of the on / off control unit is connected to a power supply, the second terminal of the on / off control unit is connected to a first interface of the miniature solenoid valve, and the third terminal of the on / off control unit receives an on / off enable signal; the on / off control unit is used to connect the power supply circuit from the power supply to the miniature solenoid valve when receiving a high-level on / off enable signal, and to disconnect the power supply circuit from the power supply to the miniature solenoid valve when receiving a low-level on / off enable signal. This allows the on / off enable signal to control the opening and closing of the miniature solenoid valve, enabling timely repair of the solenoid valve in case of malfunction, and replacement of the miniature solenoid valve if necessary.

[0073] Furthermore, this utility model embodiment also proposes an electronic device. (Refer to...) Figure 5 and Figure 6 , Figure 5 This is a schematic diagram of the structure of an embodiment of the electronic device of this utility model; Figure 6 This is a circuit connection diagram of an embodiment of the electronic device of this utility model. The electronic device includes the miniature solenoid valve control circuit as described above.

[0074] Since the electronic device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0075] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A miniature solenoid valve control circuit, characterized in that, The miniature solenoid valve control circuit includes: a current detection unit, a cut-off protection unit, and a miniature solenoid valve; The first interface of the miniature solenoid valve is connected to the power supply, the second interface of the miniature solenoid valve is connected to the first end of the cut-off protection unit, the second end of the cut-off protection unit is connected to the first end of the current detection unit, the second end of the current detection unit is grounded, and the third end of the current detection unit is connected to the third end of the cut-off protection unit. The current detection unit is used to collect the operating current of the miniature solenoid valve, and when the amplitude of the operating current exceeds a preset operating threshold, it outputs a low-level protection enable signal to the cut-off protection unit. The cut-off protection unit is used to disconnect the power supply circuit of the miniature solenoid valve when it receives a low-level protection enable signal.

2. The miniature solenoid valve control circuit as described in claim 1, characterized in that, The cut-off protection unit includes: a first switching transistor; The first end of the first switching transistor is connected to the second interface of the miniature solenoid valve, the second end of the first switching transistor is connected to the first end of the current detection unit, and the third end of the first switching transistor is connected to the third end of the current detection unit.

3. The miniature solenoid valve control circuit as described in claim 2, characterized in that, The current detection unit includes: a first resistor and a comparator; The first end of the first resistor is connected to both the second end of the first switching transistor and the first end of the comparator. The second end of the first resistor is grounded. The second end of the comparator receives a preset current comparison signal. The third end of the comparator is connected to the third end of the first switching transistor.

4. The miniature solenoid valve control circuit as described in claim 3, characterized in that, The miniature solenoid valve control circuit also includes: a first diode; The cathode of the first diode is connected to the first interface of the miniature solenoid valve, and the anode of the first diode is connected to the first end of the first switching transistor.

5. The miniature solenoid valve control circuit as described in claim 1, characterized in that, The miniature solenoid valve control circuit also includes: an on / off control unit; The first terminal of the on / off control unit is connected to the power supply, the second terminal of the on / off control unit is connected to the first interface of the miniature solenoid valve, and the third terminal of the on / off control unit receives the on / off enable signal. The on / off control unit is used to turn on the power supply circuit from the power supply to the miniature solenoid valve when a high-level on / off enable signal is received, and to disconnect the power supply circuit from the power supply to the miniature solenoid valve when a low-level on / off enable signal is received.

6. The miniature solenoid valve control circuit as described in claim 5, characterized in that, The on / off control unit includes: an on subunit and a maintenance subunit; The power supply includes a first voltage source and a second voltage source, and the on / off enable signal includes a first voltage source enable signal and a second voltage source enable signal, wherein the voltage amplitude of the first voltage source is greater than the voltage amplitude of the second voltage source. The first end of the opening subunit is connected to the first voltage source, the second end of the opening subunit is connected to the first interface of the miniature solenoid valve, and the third end of the opening subunit receives the first voltage source enable signal. The first end of the sustaining subunit is connected to the second voltage source, the second end of the sustaining subunit is connected to the first interface of the miniature solenoid valve, and the third end of the sustaining subunit receives the second voltage source enable signal. The opening subunit is used to turn on the power supply circuit from the first voltage source to the micro solenoid valve when a high-level first voltage source enable signal is received, thereby driving the micro solenoid valve to enter the open state. The sustaining subunit is used to conduct the power supply circuit of the second voltage source to the miniature solenoid valve when a high-level second voltage source enable signal is received, thereby maintaining the open state of the miniature solenoid valve.

7. The miniature solenoid valve control circuit as described in claim 6, characterized in that, The switching subunit includes: a second to a fourth resistor, a first capacitor, a second switching transistor, and a third switching transistor; The first end of the second resistor is simultaneously connected to the first end of the first capacitor, the first end of the second switching transistor, and the first voltage source. The second end of the second resistor is simultaneously connected to the second end of the first capacitor, the third end of the second switching transistor, and the first end of the third switching transistor. The second end of the second switching transistor is connected to the first interface of the miniature solenoid valve. The third end of the third switching transistor is simultaneously connected to the first end of the third resistor and the first end of the fourth resistor. The second end of the third resistor receives the first voltage source enable signal. The second end of the third switching transistor is connected to the second end of the fourth resistor and grounded.

8. The miniature solenoid valve control circuit as described in claim 6, characterized in that, The sustaining subunit includes: a fifth to a seventh resistor, a second capacitor, a fourth switch, and a fifth switch; The first end of the fifth resistor is simultaneously connected to the first end of the second capacitor, the first end of the fourth switch, and the second voltage source. The second end of the fifth resistor is simultaneously connected to the second end of the second capacitor, the third end of the fourth switch, and the first end of the fifth switch. The second end of the fourth switch is connected to the first interface of the miniature solenoid valve. The third end of the fifth switch is simultaneously connected to the first end of the sixth resistor and the first end of the seventh resistor. The second end of the sixth resistor receives the enable signal from the second voltage source. The second end of the fifth switch is connected to the second end of the seventh resistor and grounded.

9. The miniature solenoid valve control circuit as described in claim 8, characterized in that, The miniature solenoid valve control circuit also includes: a second diode; The cathode of the second diode is connected to the first interface of the miniature solenoid valve, and the anode of the second diode is connected to the second end of the fourth switching transistor.

10. An electronic device, characterized in that, The electronic device includes: a miniature solenoid valve control circuit as described in any one of claims 1-9.

Images