High-sensitivity resistance-meeting rollback protection circuit for lifting table

Abstract

The utility model provides a high-sensitivity resistance-encountering rollback protection circuit for a lifting table, and relates to the field of protection circuits, the high-sensitivity resistance-encountering rollback protection circuit comprises an MCU, a key assembly, an activation circuit, an interface circuit, a pressure detection sensor and a pressure detection circuit, the key assembly is electrically connected with the input end of the activation circuit, and the key assembly is electrically connected with the input end of the interface circuit; the pressure detection sensor is electrically connected with the MCU through the pressure detection circuit, the interface circuit is electrically connected with the MCU, and the MCU is externally connected with a display circuit. According to the utility model, the external pressure can be detected through the pressure detection sensor, and after the pressure is divided through the pressure detection circuit, the voltage is sent to an ADC detection pin of the MCU; when the MCU detects that the pressure value is abnormal, resistance backspacing protection can be triggered, lifting can be controlled through the key assembly, and when the key assembly is pressed down for the first time, the activation circuit is used for activating the MCU, and then control is conducted through the key.

Description

Technical Field

[0001] The present application relates to the field of protection circuits, and in particular to a high-sensitivity resistance-encountering retraction protection circuit for a lifting table. Background Art

[0002] With the development of science and technology, more and more fields use electric, such as lifting tables, electric sofas, massage chairs, medical beds, elderly chairs, etc., which bring a lot of convenience and life experience to our lives. However, electric products can provide powerful driving force, but also bring certain tests to safety.

[0003] For example, a lifting table can support the lifting of loads of tens to hundreds of kilograms. If it encounters obstacles during the lifting process, a strong collision may occur, damaging items or even injuring people. Therefore, an effective obstacle-encountering retraction function is needed to ensure the safety of operation. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a high-sensitivity resistance-encountering retraction protection circuit for a lifting table, which can solve technical problems that current lifting tables do not have.

[0005] An embodiment of the present application provides a highly sensitive resistance-encountering retraction protection circuit for a lifting table, comprising an MCU, a button assembly, an activation circuit, an interface circuit, a pressure detection sensor, and a pressure detection circuit. The button assembly is electrically connected to an input end of the activation circuit, an output end of the activation circuit is electrically connected to the MCU, the button assembly is electrically connected to the MCU, the pressure detection sensor is electrically connected to the MCU via the pressure detection circuit, the interface circuit is electrically connected to the MCU, and the MCU is externally connected to a display circuit.

[0006] Preferably, the interface circuit is a handheld controller interface, and the interface circuit is wirelessly connected to the handheld controller.

[0007] Preferably, the pressure detection circuit includes a resistor R27, a resistor R28, and a capacitor C15, one end of the resistor R27 is connected to the power supply, the other end of the resistor R27 is connected to the pressure detection sensor and one end of the resistor R28, one end of the resistor R28 is connected to the pressure detection sensor, the other end of the resistor R28 is electrically connected to the MCU, and the other end of the resistor R28 is grounded through the capacitor C15.

[0008] Preferably, the button assembly includes multiple buttons, multiple protection resistors, and multiple diodes. The buttons are electrically connected to the MCU through the diodes, and the diodes are connected to the power supply through the protection resistors.

[0009] Preferably, the power supply voltage of the power supply is 3.3-5V.

[0010] Preferably, a plurality of pressure detection sensors may be provided.

[0011] Preferably, the display circuit has a digital tube display screen.

[0012] Beneficial effects of the utility model:

[0013] The utility model provides a high-sensitivity resistance-encountering retraction protection circuit for a lifting table, comprising an MCU, a button assembly, an activation circuit, an interface circuit, a pressure detection sensor, and a pressure detection circuit. The button assembly is electrically connected to an input end of the activation circuit, an output end of the activation circuit is electrically connected to the MCU, the button assembly is electrically connected to the MCU, the pressure detection sensor is electrically connected to the MCU via the pressure detection circuit, the interface circuit is electrically connected to the MCU, and the MCU is externally connected to a display circuit. The utility model can detect the external pressure via the pressure detection sensor, and after voltage division by the pressure detection circuit, the voltage is sent to an ADC detection pin of the MCU. If the MCU detects an abnormal pressure value, resistance-encountering retraction protection will be triggered. The utility model can control the lifting via the button assembly. When pressed for the first time, the activation circuit is used to activate the MCU, and then control is performed via the button. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is the circuit principle diagram of the utility model;

[0016] Figure 2 It is a framework diagram of the utility model. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0019] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0020] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0021] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0022] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0023] A high-sensitivity resistance-encountering retraction protection circuit for a lifting table comprises an MCU, a button assembly, an activation circuit, an interface circuit, a pressure detection sensor, and a pressure detection circuit. The button assembly is electrically connected to an input end of the activation circuit, an output end of the activation circuit is electrically connected to the MCU, the button assembly is electrically connected to the MCU, the pressure detection sensor is electrically connected to the MCU via the pressure detection circuit, the interface circuit is electrically connected to the MCU, and the MCU is externally connected to a display circuit. The utility model can detect external pressure via the pressure detection sensor, and after voltage division by the pressure detection circuit, the voltage is sent to an ADC detection pin of the MCU. If the MCU detects an abnormal pressure value, resistance-encountering retraction protection will be triggered. The utility model can control lifting via the button assembly. When pressed for the first time, the activation circuit is used to activate the MCU, and then control is performed via the button.

[0024] Specifically, the buttons include up, down, menu and other control buttons.

[0025] In this embodiment, the interface circuit is a handheld controller interface, and the interface circuit is wirelessly connected to the handheld controller. The handheld controller sends instructions to the MCU through the interface circuit, and the MCU controls the height of the table.

[0026] In this embodiment, the pressure detection circuit includes a resistor R27, a resistor R28, and a capacitor C15. One end of the resistor R27 is connected to the power supply, the other end of the resistor R27 is connected to the pressure detection sensor and one end of the resistor R28, one end of the resistor R28 is connected to the pressure detection sensor, the other end of the resistor R28 is electrically connected to the MCU, and the other end of the resistor R28 is grounded through the capacitor C15.

[0027] In this embodiment, the button assembly includes multiple buttons, multiple protection resistors, and multiple diodes. The buttons are electrically connected to the MCU through the diodes, and the diodes are connected to the power supply through the protection resistors.

[0028] In this embodiment, the power supply voltage of the power supply is 3.3-5V.

[0029] In this embodiment, a plurality of pressure detection sensors may be provided, and the pressure detection sensor needs to be backed by foam or sponge rubber, which can provide a buffering force when encountering obstacles and will not cause excessive pressure to damage the pressure detection sensor.

[0030] In this embodiment, the display circuit has a digital tube display screen, and the digital tube display screen displays the table height, status, and error information.

[0031] Specifically, it is necessary to ensure that the response speed is fast enough, scan the pressure value of the pressure detection sensor every 1mS, or set a trigger threshold interrupt; to prevent false triggering caused by consistency problems of the pressure detection sensor and changes in characteristics after aging, it is necessary to collect pressure values ​​when stationary according to the state of the lifting table, and continuously monitor changes in pressure values ​​when running. When a sudden change in pressure is detected, the resistance fallback protection is quickly triggered.

[0032] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high-sensitivity resistance-resistance protection circuit for a lifting table, characterized in that: It includes an MCU, a button assembly, an activation circuit, an interface circuit, a pressure detection sensor, and a pressure detection circuit. The button assembly is electrically connected to the input end of the activation circuit, the output end of the activation circuit is electrically connected to the MCU, the button assembly is electrically connected to the MCU, the pressure detection sensor is electrically connected to the MCU through the pressure detection circuit, the interface circuit is electrically connected to the MCU, and the MCU is externally connected to a display circuit.

2. According to claim 1, a high-sensitivity resistance-encountering fallback protection circuit for a lifting table, characterized in that: The interface circuit is a handheld controller interface, and the interface circuit is wirelessly connected to the handheld controller.

3. According to claim 1, a high-sensitivity resistance-encountering fallback protection circuit for a lifting table, characterized in that: The pressure detection circuit includes a resistor R27, a resistor R28, and a capacitor C15. One end of the resistor R27 is connected to the power supply, the other end of the resistor R27 is connected to the pressure detection sensor and one end of the resistor R28, one end of the resistor R28 is connected to the pressure detection sensor, the other end of the resistor R28 is electrically connected to the MCU, and the other end of the resistor R28 is grounded through the capacitor C15.

4. According to claim 1, a high-sensitivity resistance-encountering retraction protection circuit for a lifting table, characterized in that: The button assembly includes a plurality of buttons, a plurality of protection resistors, and a plurality of diodes. The buttons are electrically connected to the MCU through the diodes, and the diodes are connected to a power supply through the protection resistors.

5. A high-sensitivity resistance-encountering fallback protection circuit for a lifting table according to claim 3 or 4, characterized in that: The power supply voltage of the power supply is 3.3-5V.

6. The high-sensitivity resistance-encountering fallback protection circuit of a lifting table according to claim 1, characterized in that: The pressure detection sensor may be provided in plurality.

7. The high-sensitivity resistance-encountering fallback protection circuit of a lifting table according to claim 1, characterized in that: The display circuit is provided with a digital tube display screen.

Images