Solenoid protection device, solenoid assembly and electronic equipment

Abstract

The utility model discloses a protection device of a solenoid, a solenoid assembly and electronic equipment. The protection device comprises a switch unit and a control unit, the switch unit comprises an input end, an output end and a control end; the input end of the switch unit is used for being connected with the solenoid, and the output end and the control end of the switch unit are connected with the control unit. The control unit is used for controlling the switch unit to be switched on so as to switch on a branch circuit where the solenoid is located, and controlling the switch unit to be switched off so as to switch off the branch circuit where the solenoid is located under the condition that the output voltage of the switch unit is smaller than a first voltage value after the branch circuit is switched on; wherein the output voltage of the switch unit is inversely correlated with the temperature of the solenoid.

Description

Technical Field

[0001] This application relates to the field of solenoid technology, and more particularly to a solenoid protection device, solenoid assembly, and electronic device. Background Technology

[0002] Solenoids are used in many applications to generate magnetic fields for mechanical motion or control. When a solenoid is energized for an extended period, its coil generates heat due to its internal resistance. Excessive temperature not only reduces the solenoid's lifespan but can also damage it and even pose safety hazards. Therefore, it is necessary to design a solenoid protection device to protect the solenoid when its temperature becomes too high. Utility Model Content

[0003] In a first aspect, embodiments of this application provide a protection device for a solenoid, the protection device comprising: a switching unit and a control unit; the switching unit includes an input terminal, an output terminal, and a control terminal; the input terminal of the switching unit is used to connect to the solenoid, and the output terminal and control terminal of the switching unit are respectively connected to the control unit; the control unit is used to control the switching unit to conduct, so as to conduct the branch where the solenoid is located, and after the branch is conducted, if the output voltage of the switching unit is less than a first voltage value, control the switching unit to disconnect, so as to disconnect the branch where the solenoid is located; wherein, the output voltage of the switching unit is inversely correlated with the temperature of the solenoid.

[0004] In some embodiments, the protection device further includes an amplification unit connected between the output of the switching unit and the control unit.

[0005] In some embodiments, the amplification unit includes an operational amplifier, an input resistor, and a feedback resistor; the input resistor is connected between the inverting input terminal of the operational amplifier and ground, and the feedback resistor is connected between the inverting input terminal of the operational amplifier and the output terminal of the operational amplifier.

[0006] In some embodiments, the protection device further includes: an alarm unit connected to the control unit; the control unit controls the alarm unit to output alarm information when the output voltage of the switch unit is less than a first voltage value.

[0007] In some embodiments, the switching unit includes an NPN transistor, the input terminal of the switching unit is the collector of the NPN transistor, the output terminal of the switching unit is the emitter of the NPN transistor, and the control terminal of the switching unit is the base of the NPN transistor.

[0008] In some embodiments, the switching unit includes an NMOS transistor, the input terminal of the switching unit is the drain of the NMOS transistor, the output terminal of the switching unit is the source of the NMOS transistor, and the control terminal of the switching unit is the gate of the NMOS transistor.

[0009] In some embodiments, the protection device further includes a backflow protection unit connected in parallel with the solenoid to prevent backflow of current on the solenoid after the switching unit is disconnected.

[0010] In some embodiments, the control unit is further configured to: after controlling the switching unit to turn off, re-control the switching unit to turn on.

[0011] In some embodiments, the control unit re-energizes the switching unit upon detecting a user's control operation.

[0012] In some embodiments, if the control unit controls the switch unit to turn on again after the duration of the switch unit being turned off reaches a first preset duration.

[0013] In some embodiments, the solenoid is applied to an electronic device; if the electronic device has an unfinished task, the control unit, after controlling the switch unit to be disconnected for a first preset time, controls the switch unit to be turned on again; the task is executed when the branch where the solenoid is located is turned on.

[0014] In some embodiments, the control unit is further configured to: control the switch unit to turn on and start timing; control the switch unit to turn off when the timing reaches a second preset duration; re-detect the output voltage of the switch unit during the timing period; and control the switch unit to turn on again if the re-detected output voltage is greater than or equal to the first voltage value.

[0015] In some embodiments, the solenoid is applied to an electronic device; the control unit is configured to: determine whether the electronic device is performing a task when the output voltage of the switching unit is less than a first voltage value; the task is performed when the branch where the solenoid is located is conducting; if so, control the switching unit to disconnect after the task is completed.

[0016] In some embodiments, the control unit is configured to: output a prompt message when the output voltage of the switching unit is less than a second voltage value and greater than or equal to the first voltage value, to prompt the user to disconnect the branch where the solenoid is located; if a confirmation command for the prompt message is received, control the switching unit to disconnect to disconnect the branch where the solenoid is located; otherwise, control the switching unit to disconnect when the output voltage of the switching unit is less than the first voltage value, to disconnect the branch where the solenoid is located; wherein the second voltage value is greater than the first voltage value.

[0017] Secondly, embodiments of this application provide a solenoid assembly, the solenoid assembly comprising: a solenoid; and the protection device described in the first aspect.

[0018] Thirdly, embodiments of this application provide an electronic device, the electronic device comprising: the solenoid assembly described in the second aspect; and a moving component driven by the solenoid assembly.

[0019] In some embodiments, the electronic device is a printer, a cutter, or a printer-cutter combo machine.

[0020] In this embodiment, a protection device for a solenoid is designed based on a switching unit and a control unit. The input terminal of the switching unit is connected to the solenoid, and the output and control terminals of the switching unit are respectively connected to the control unit. After the control unit controls the switching unit to conduct, the branch containing the solenoid is conductive, and the solenoid operates normally. As the operating time increases, the temperature of the solenoid gradually increases, leading to an increase in the internal resistance of the solenoid, which in turn causes the output voltage of the switching unit to gradually decrease. The control unit can detect the output voltage of the switching unit after the branch containing the solenoid is conductive. If the detected output voltage is less than a first voltage value, the control unit is controlled to disconnect, thereby disconnecting the branch containing the solenoid. Through this method, the solenoid can be protected against overheating, thereby improving the service life of the solenoid and reducing safety hazards.

[0021] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this application. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments consistent with this application and, together with the description, serve to explain the technical solutions of this application.

[0023] Figure 1 This is a schematic diagram of the structure of the solenoid protection device according to an embodiment of this application.

[0024] Figure 2This is a circuit diagram of a solenoid protection device according to an embodiment of this application.

[0025] Figure 3 This is a schematic diagram of the structure of a solenoid assembly according to an embodiment of this application.

[0026] Figure 4 This is a schematic diagram of an electronic device according to an embodiment of this application.

[0027] Figure 5 This is a flowchart of the control method according to an embodiment of this application. Detailed Implementation

[0028] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0029] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items. Additionally, the term “at least one” herein means any combination of at least two of any one or more of a plurality.

[0030] It should be understood that although the terms first, second, third, etc., may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0031] To enable those skilled in the art to better understand the technical solutions in the embodiments of this application, and to make the above-mentioned objectives, features and advantages of the embodiments of this application more apparent and understandable, the technical solutions in the embodiments of this application will be further described in detail below with reference to the accompanying drawings.

[0032] In related technologies, open-loop control is typically used to control solenoids, meaning the solenoid's operating state is entirely controlled by received switching commands. However, when a solenoid is energized for an extended period, its coil generates heat due to its internal resistance. Excessive temperature not only reduces the solenoid's lifespan but can also damage it and even pose safety hazards.

[0033] Based on this, this application designs a solenoid protection device 200, which uses a closed-loop control method to protect the solenoid. See also Figure 1 The protection device 200 includes:

[0034] Switching unit 101 and control unit 102; switching unit 101 includes an input terminal, an output terminal and a control terminal;

[0035] The input terminal of the switching unit 101 is used to connect to the solenoid L, and the output terminal and control terminal of the switching unit 101 are respectively connected to the control unit 102;

[0036] The control unit 102 is used to control the switch unit 101 to conduct so as to conduct the branch R where the solenoid L is located. After the branch R where the solenoid L is located is conducted, if the output voltage of the switch unit 101 is less than a first voltage value, the control unit 102 controls the switch unit 101 to disconnect so as to disconnect the branch R where the solenoid L is located. The output voltage of the switch unit 101 is inversely related to the temperature of the solenoid L.

[0037] The control unit 102 in this embodiment can control the switching unit 101 to conduct, thereby connecting the branch R containing the solenoid L and enabling the solenoid L to operate normally. Furthermore, the control unit 102 can also control the switching unit 101 to disconnect when the output voltage of the switching unit 101 is less than a first voltage value, thus disconnecting the branch R containing the solenoid L. Since the output voltage of the switching unit 101 is inversely correlated with the temperature of the solenoid L, the above-mentioned measures can provide power-off protection for the solenoid L when its temperature is too high, thereby improving the service life of the solenoid L and reducing safety hazards. The implementation details of this embodiment are illustrated below.

[0038] The switching unit 101 in this embodiment is used to implement a switching function. The switching unit 101 includes two states: on and off. When the switching unit 101 is in the on state, it can connect the branch R containing the solenoid L; when the switching unit 101 is in the off state, it can disconnect the branch R containing the solenoid L. The branch R containing the solenoid L includes the power supply branch containing the solenoid L, that is, the branch where power supply VCC supplies power to the solenoid L.

[0039] The switching unit 101 can be implemented based on components such as transistors, relays, mechanical switches, and electric switches. The following section will discuss this further. Figure 2 The embodiments of the switching unit 101 are illustrated by taking the transistor-based implementation of the switching unit 101 as an example.

[0040] like Figure 2 As shown, the switching unit 101 includes a transistor Q1. The transistor Q1 is an NPN transistor. The input terminal of the switching unit 101 is the collector (c) of the NPN transistor, the output terminal is the emitter (e) of the NPN transistor, and the control terminal is the base (b) of the NPN transistor. In some embodiments, the base (b) of the NPN transistor is grounded through resistor R3, the emitter (e) is grounded through resistor R4, and the base (b) is connected to the control unit 102 through resistor R5.

[0041] Control unit 102 can output a high-level control signal to the base (b) of the NPN transistor to turn on the NPN transistor, thereby turning on the branch R containing solenoid L. After the branch R containing solenoid L is turned on, control unit 102 can detect the output voltage of the emitter (e) of the NPN transistor. As the operating time of solenoid L increases, the internal resistance of solenoid L gradually increases, causing the current flowing through solenoid L to decrease, thereby reducing the output voltage of the emitter (e) of the NPN transistor. If the output voltage of the emitter (e) of the NPN transistor is less than a first voltage value, it can be presumed that the temperature of solenoid L is too high. Therefore, control unit 102 can stop outputting the high-level control signal to the base (b) of the NPN transistor to turn off the NPN transistor, thereby disconnecting the branch R containing solenoid L. In this way, protection of solenoid L is achieved.

[0042] In other embodiments, the NPN transistor can be replaced with a MOSFET. The MOSFET is an NMOS transistor, the input terminal of the switching unit 101 is the drain (D) of the NMOS transistor, the output terminal of the switching unit 101 is the source (S) of the NMOS transistor, and the control terminal of the switching unit 101 is the gate (G) of the NMOS transistor. In some embodiments, the gate (G) of the NMOS transistor is grounded through resistor R3, the source (S) is grounded through resistor R4, and the gate (G) is connected to the control unit 102 through resistor R5.

[0043] Control unit 102 can output a high-level control signal to the gate G of the NMOS transistor to turn it on, thereby turning on the branch R containing solenoid L. After the branch R containing solenoid L is turned on, control unit 102 can detect the output voltage of the source S of the NMOS transistor. As the operating time of solenoid L increases, the internal resistance of solenoid L gradually increases, causing the current flowing through solenoid L to decrease, thereby reducing the output voltage of the source S of the NMOS transistor. If the output voltage of the source S of the NMOS transistor is less than a first voltage value, it can be presumed that the temperature of solenoid L is too high. Therefore, control unit 102 can stop outputting the high-level control signal to the gate G of the NMOS transistor to turn it off, thereby disconnecting the branch R containing solenoid L. In this way, protection of solenoid L is achieved.

[0044] Besides transistors and MOSFETs, the switching unit 101 can also be other types of switches, such as electric switches. The control unit 102 can output a conduction control signal to the switching unit 101 to control the switching unit 101 to conduct, and can output a disconnection control signal to the switching unit 101 to control the switching unit 101 to disconnect. The specific type and principle of the switching unit 101 will not be described in detail in this application.

[0045] In the above embodiments, the first voltage value can be set by the user. The first voltage value can be an absolute value; for example, the user can set the first voltage value to 5V, then when the output voltage of the switching unit 101 is less than 5V, the control unit 102 controls the switching unit 101 to disconnect. Alternatively, the first voltage value can also be a proportional value, representing the ratio between the voltage at which the control unit 102 controls the switching unit 101 to disconnect and the voltage at which the control unit 102 controls the switching unit 101 to conduct. For example, the user can set the first voltage value to 20%, then when the output voltage of the switching unit 101 is less than 20% of the voltage at which the control unit 102 controls the switching unit 101 to conduct, the control unit 102 controls the switching unit 101 to disconnect. In some embodiments, the control unit 102 may include a human-machine interface component (such as a touchscreen or button), through which the user can input the first voltage value.

[0046] In some embodiments, the solenoid L is applied to an electronic device. When the branch R containing the solenoid L is conducting, the electronic device can perform a task. Specifically, the electronic device may include a moving component. When the solenoid L is working, it can generate an electromagnetic field. This moving component can move under the influence of the electromagnetic field generated by the solenoid L, thereby enabling the electronic device to perform a task. For example, the electronic device may be a printer, a cutter, or a printer-cutter combo machine. The moving component may include the print head of a printer and / or the blade of a cutter. The solenoid L can drive the print head of a printer to move to perform a printing task, or drive the blade of a cutter to move to perform a cutting task. To maintain task integrity, the control unit 102 can determine whether the electronic device is performing a task when the output voltage of the switching unit 101 is less than a first voltage value. If so, the control unit 102 can control the switching unit 101 to disconnect after the task is completed. Alternatively, the control unit 102 may also output selection information when the output voltage of the switching unit 101 is less than the first voltage value, allowing the user to choose whether to disconnect the switching unit 101 immediately or after the task is completed. If the user chooses to immediately disconnect the switch unit 101, the control unit 102 can immediately disconnect the switch unit 101 in response to the user's selection; if the user chooses to disconnect the switch unit 101 after the task is completed, the control unit 102 can detect the task status and disconnect the switch unit 101 after the task is completed.

[0047] In some embodiments, the control unit 102 may output a prompt message when the output voltage of the switching unit 101 is less than a second voltage value but greater than or equal to a first voltage value, prompting the user to disconnect the branch R containing the solenoid L. If a confirmation command for the prompt message is received, the control unit 102 controls the switching unit 101 to disconnect the branch R containing the solenoid L. Otherwise, when the output voltage of the switching unit 101 is less than the first voltage value, the control unit 101 controls the switching unit 101 to disconnect the branch R containing the solenoid L. The second voltage value is greater than the first voltage value. This embodiment provides two voltage levels: a first voltage value and a second voltage value. When the output voltage of the switching unit 101 is less than the second voltage value but greater than or equal to the first voltage value, the temperature of the solenoid L rises, and the user can decide whether to allow the solenoid L to continue operating. When the output voltage of the switching unit 101 is less than the first voltage value, the temperature of the solenoid L rises further, and the control unit 101 can be directly disconnected without user selection.

[0048] In some embodiments, see Figure 2The protection device 200 also includes an amplification unit connected between the output terminal of the switching unit 101 and the control unit 102. The amplification unit amplifies the output voltage of the output terminal of the switching unit 101 so that the control unit 102 can detect it and make a judgment with a first voltage value. In the example where the protection device 200 includes an amplification unit, both the output voltage of the switching unit 101 and the preset voltage are the voltage amplified by the amplification unit, denoted as Vout.

[0049] like Figure 2 As shown, the amplification unit includes an operational amplifier U1, an input resistor R1, and a feedback resistor R2. The input resistor R1 is connected between the inverting input terminal of the operational amplifier U1 and ground, and the feedback resistor R2 is connected between the inverting input terminal and the output terminal of the operational amplifier U1. In the above circuit, the operational amplifier U1 is used to amplify the output voltage of the switching unit 101, and the input resistor R1 and the feedback resistor R2 are used to adjust the amplification factor. In some embodiments, resistors R1 and / or R2 are variable resistors, thereby facilitating user adjustment of the amplification factor.

[0050] In some embodiments, see Figure 2 The protection device 200 also includes a backflow protection unit connected in parallel with the solenoid L to prevent backflow of current in the solenoid L after the switching unit 101 is disconnected. Figure 2 As shown, the backflow protection unit may include a freewheeling diode D1. The anode of the freewheeling diode D1 is connected to one end of the solenoid L's connection switch unit, and the cathode of the freewheeling diode D1 is connected to the unconnected end of the solenoid L's connection switch unit. The solenoid L, as an energy storage element, converts electrical energy into magnetic energy for storage. When power is off, it may generate a reverse electromotive force (EMF), causing current backflow, which could potentially damage the device. This embodiment of the application, by setting a backflow protection unit, can prevent sudden changes in voltage and current in the circuit, provide a power-dissipating path for the reverse EMF, and thus slowly release the reverse EMF, improving the safety of the device.

[0051] In some embodiments, the protection device 200 further includes an alarm unit connected to the control unit 102. When the output voltage of the switching unit 101 is less than a first voltage value, the control unit 102 can control the alarm unit to output alarm information. The control unit 102 can control the alarm unit to output alarm information simultaneously with controlling the switching unit 101 to open, or it can control the alarm unit to output alarm information first and then control the switching unit 101 to open, or it can control the switching unit 101 to open first and then control the alarm unit to output alarm information. The alarm unit can provide alarm based on sound, vision, and / or vibration. Accordingly, the alarm unit may include a speaker, an indicator light, and / or a vibration motor.

[0052] In the second implementation, the control unit 102 first controls the alarm unit to output alarm information and starts timing. Once the preset time has elapsed, it then controls the switch unit 101 to disconnect. This provides the user with sufficient reaction time before the solenoid L is de-energized. Furthermore, while timing is in progress, a prompt message can be output to alert the user that the solenoid L is about to be de-energized. If a confirmation of de-energization is received from the user in response to the prompt message, the switch unit 101 is disconnected; if a cancellation of de-energization is received from the user in response to the prompt message, the switch unit 101 is kept in the on state.

[0053] In some embodiments, the protection device 200 further includes a heat dissipation unit, such as a fan. The control unit 102 can control the heat dissipation unit to start working when the output voltage of the switching unit 101 is less than a third voltage value but greater than or equal to a first voltage value, in order to dissipate heat from the solenoid L. The third voltage value is greater than the first voltage value. Optionally, the third voltage value is the voltage at which the control unit 102 controls the switching unit 101 to turn on; that is, the control unit 102 controls the heat dissipation unit to start working when the branch containing the solenoid L is turned on. After the heat dissipation unit starts working, as the working time of the solenoid L continues to increase, the temperature of the solenoid L may continue to increase, causing the output voltage of the switching unit 101 to decrease from the third voltage value to the first voltage value. The control unit 102 can control the switching unit 101 to turn off when the output voltage of the switching unit 101 is less than the first voltage value, thereby disconnecting the branch containing the solenoid L. By providing a heat dissipation unit, heat can be dissipated from the solenoid L during operation, thereby slowing down the rate of temperature rise of the solenoid L. In this way, the solenoid L can work for a longer period of time before the control unit 102 controls the switch unit 101 to disconnect, thereby avoiding frequent power outages of the solenoid L and affecting the user experience.

[0054] In some embodiments, the control unit 102 can also re-control the switch unit 101 to conduct after the control switch unit 101 is turned off, thereby causing the solenoid L to work again.

[0055] Optionally, the control unit 102 can re-energize the switch unit 101 upon detecting a user's control operation. Specifically, the control unit 102 may include an operation control for restarting the solenoid L. The control unit 102 can re-energize the switch unit 101 upon detecting a user's control operation on this operation control.

[0056] Optionally, the control unit 102 can re-control the switch unit 101 to conduct if the duration of the switch unit 101 being off reaches a first preset duration. After the switch unit 101 is off, the temperature of the solenoid L gradually decreases over time. When the duration of the switch unit 101 being off reaches the first preset duration, it can be presumed that the temperature of the solenoid L has decreased to the desired level. Therefore, the control unit 102 can re-control the switch unit 101 to conduct.

[0057] Furthermore, when the solenoid L is applied to an electronic device, if the electronic device has an unfinished task, the control unit 102 can re-control the switch unit 101 to conduct after the control switch unit 101 has been off for a first preset time, so that the electronic device can continue to execute the unfinished task. If the electronic device has no unfinished task, the control unit 102 does not need to re-control the switch unit 101 to conduct.

[0058] In some embodiments, the control unit 102 is further configured to control the switch unit 101 to turn on and start timing, and control the switch unit 101 to turn off when the timing reaches a second preset duration. During the timing period, the output voltage of the switch unit 101 is re-detected. If the re-detected output voltage is greater than or equal to a first voltage value, the switch unit 101 is controlled to turn on again. In this embodiment, after controlling the switch unit 101 to turn off, the control unit first controls the switch unit 101 to turn on temporarily and detects the output voltage of the switch unit 101. If the detected voltage is greater than or equal to the first voltage value, it can be presumed that the temperature of the solenoid L has dropped to the desired level. Therefore, the switch unit 101 can be controlled to turn on again to make the solenoid L work again.

[0059] The following is an example illustrating a specific embodiment of this application. Figure 2 As shown, the switching unit 101 includes an NPN transistor, the control unit 102 includes a central processing unit (CPU), the amplification unit includes an operational amplifier U1, an input resistor R1, and a feedback resistor R2, the reverse current protection unit includes a freewheeling diode, and the protection device 200 also includes a speaker 105. The working principle of the protection device 200 in this embodiment is as follows:

[0060] (1) Voltage detection circuit:

[0061] In the power supply circuit of solenoid L (i.e., the branch where solenoid L is located), a current sensing resistor R3 is set up. This resistor monitors the current value I through the solenoid in real time. During operation, a voltage is generated across resistor R3, which is detected by operational amplifier U1 and output to the CPU. The voltage detected by the CPU can be recorded as: Vout = (1 + R2 / R1) * I * R3.

[0062] (2) Relationship between temperature and internal resistance:

[0063] When energized, the internal resistance of the solenoid L increases with rising temperature. Normally, this would decrease the current. If the current change exceeds a preset safe range, it indicates that the solenoid may be overheating.

[0064] (3) Control circuit:

[0065] The voltage detection circuit is connected to the control circuit CPU. When a voltage change is detected that exceeds the set range (i.e., the first voltage value mentioned above), the control circuit CPU will immediately trigger the transistor Q1 to cut off the power supply to the solenoid L to prevent further heating.

[0066] (4) System feedback mechanism:

[0067] The system can be configured with an alarm mechanism that alerts the user via a speaker when power is cut off. Once the temperature returns to normal, the system can automatically or manually restore power to the solenoid.

[0068] The embodiments of this application have the following advantages:

[0069] Real-time monitoring: It can monitor the working status of solenoid L in real time and respond promptly to temperature changes.

[0070] Automatic protection: Automatically cuts off power when the temperature is too high to prevent damage to the solenoid L.

[0071] Improve safety: Reduce safety hazards caused by overheating.

[0072] Extended lifespan: By preventing overheating, the service life of the solenoid L is effectively extended.

[0073] See Figure 3 This application also provides a solenoid assembly 100, which includes a solenoid L and a protection device 200 as described in any of the foregoing embodiments. The protection device 200 in this solenoid assembly is detailed in the foregoing embodiments and will not be repeated here.

[0074] See Figure 4 This application also provides an electronic device 10, which includes: the solenoid assembly 100 described in the foregoing embodiments; and a moving member 20 driven by the solenoid assembly.

[0075] In some embodiments, the electronic device 10 is a printer, a cutter, or a printer-cutter combo machine.

[0076] See Figure 5This application also provides a control method applied to the control unit of the protection device 200 described in any of the foregoing embodiments; the method includes:

[0077] Step S1: Control the switching unit to turn on, so as to turn on the branch where the solenoid is located;

[0078] Step S2: After the branch is turned on, if the output voltage of the switching unit is less than the first voltage value, control the switching unit to turn off, so as to disconnect the branch where the solenoid is located.

[0079] This application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the methods described in any of the foregoing embodiments.

[0080] Computer-readable media include both permanent and non-permanent, removable and non-removable media that can store information by any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by computer devices. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0081] The various embodiments in this application are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the device embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments. The device embodiments described above are merely illustrative. The modules described as separate components may or may not be physically separate. When implementing the embodiments of this application, the functions of each module can be implemented in one or more software and / or hardware. Alternatively, some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0082] The above description is only a specific implementation of the embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the embodiments of this application, and these improvements and modifications should also be considered as the protection scope of the embodiments of this application.

Claims

1. A protective device for a solenoid, characterized in that, The protective device includes: A switching unit and a control unit; the switching unit includes an input terminal, an output terminal, and a control terminal; The input terminal of the switching unit is used to connect to the solenoid, and the output terminal and control terminal of the switching unit are respectively connected to the control unit; The control unit is used to control the switching unit to conduct, so as to conduct the branch where the solenoid is located, and after the branch is conducted, if the output voltage of the switching unit is less than a first voltage value, control the switching unit to disconnect, so as to disconnect the branch where the solenoid is located; wherein, the output voltage of the switching unit is inversely related to the temperature of the solenoid.

2. The apparatus according to claim 1, characterized in that, The protection device also includes an amplification unit connected between the output terminal of the switching unit and the control unit.

3. The apparatus according to claim 2, characterized in that, The amplification unit includes an operational amplifier, an input resistor, and a feedback resistor; The input resistor is connected between the inverting input terminal of the operational amplifier and ground, and the feedback resistor is connected between the inverting input terminal of the operational amplifier and the output terminal of the operational amplifier.

4. The apparatus according to claim 1, characterized in that, The protective device also includes: An alarm unit connected to the control unit; When the output voltage of the switch unit is less than a first voltage value, the control unit controls the alarm unit to output alarm information.

5. The apparatus according to claim 1, characterized in that, The switching unit includes an NPN transistor, the input terminal of the switching unit is the collector of the NPN transistor, the output terminal of the switching unit is the emitter of the NPN transistor, and the control terminal of the switching unit is the base of the NPN transistor.

6. The apparatus according to claim 1, characterized in that, The switching unit includes an NMOS transistor, the input terminal of the switching unit is the drain of the NMOS transistor, the output terminal of the switching unit is the source of the NMOS transistor, and the control terminal of the switching unit is the gate of the NMOS transistor.

7. The apparatus according to claim 1, characterized in that, The protective device also includes: A backflow protection unit connected in parallel with the solenoid is used to prevent current backflow on the solenoid after the switching unit is disconnected.

8. The apparatus according to claim 1, characterized in that, The control unit is also used for: After the switch unit is turned off, it is turned back on.

9. The apparatus according to claim 8, characterized in that, When the control unit detects a user's control operation, it re-energizes the switching unit.

10. The apparatus according to claim 8, characterized in that, When the duration for which the switch unit is disconnected reaches a first preset duration, the control unit re-connects the switch unit.

11. A solenoid assembly, characterized in that, The solenoid assembly includes: Solenoid; and The protective device according to any one of claims 1 to 10.

12. An electronic device, characterized in that, The electronic device includes: The solenoid assembly of claim 11; and The moving part is driven by the solenoid assembly.

13. The electronic device according to claim 12, characterized in that, The electronic device is a printer, a cutting machine, or a printer-cutting integrated machine.

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