Driving circuit for lifting table

Abstract

The utility model provides a driving circuit for a lifting table, and relates to the field of driving circuits, and the driving circuit for the lifting table comprises an EMI circuit, a rectification filter circuit, an RC absorption circuit, a transformer, an output rectification filter circuit, a controller, a control assembly, an overcurrent and overvoltage protection circuit, a feedback circuit, and a voltage reduction circuit. Power can be supplied to the lifting motor through the EMI circuit, the rectification filter circuit, the RC absorption circuit, the transformer, the output rectification filter circuit and the step-down circuit, the lifting motor can be controlled through the control assembly and the controller, and the lifting motor control circuit is simple in circuit design and low in manufacturing cost.

Description

Technical Field

[0001] This application relates to the field of drive circuits, and more specifically, to a drive circuit for a height-adjustable desk. Background Technology

[0002] With the rapid development of society, smart furniture is being widely used in people's work and life. For example, the smart height-adjustable desk is a relatively common type of smart furniture. The structure of a height-adjustable desk generally includes a tabletop, a crossbeam, a base, and a height-adjustable column. A motor is installed on the crossbeam, which drives a transmission rod inside the crossbeam to rotate. The two ends of the transmission rod are respectively connected to a linear lifting mechanism inside the column, which drives the linear lifting mechanism inside the column to rotate, thereby causing the column to rise or fall.

[0003] The current drive circuit for height-adjustable desks has a complex structure and high manufacturing cost, so it is necessary to improve the current drive circuit for height-adjustable desks. Summary of the Invention

[0004] The purpose of this application is to provide a drive circuit for a height-adjustable desk, which can solve the above-mentioned technical problems.

[0005] This application provides a drive circuit for a height-adjustable desk, including an EMI circuit, a rectifier and filter circuit, an RC snubber circuit, a transformer, an output rectifier and filter circuit, a controller, a control component, an overcurrent and overvoltage protection circuit, a feedback circuit, and a step-down circuit. The input terminal of the EMI circuit is connected to the mains power, and the output terminal of the EMI circuit is connected to the input terminal of the rectifier and filter circuit. The output terminal of the rectifier and filter circuit is connected to the input terminal of the RC snubber circuit and the controller, respectively. The output terminal of the RC snubber circuit is connected to the high-voltage side of the transformer, and the low-voltage side of the transformer is connected to the input terminal of the output rectifier and filter circuit. The output terminal of the output rectifier and filter circuit is connected to the step-down circuit. The control component, the overcurrent and overvoltage protection circuit, and the feedback circuit are all electrically connected to the controller.

[0006] Preferably, the EMI circuit includes a conjugate coil LF1, a varistor MOV1, a conjugate coil LF2, and a conjugate coil LF3, with a fuse provided between the conjugate coil LF1 and the mains power supply.

[0007] Preferably, the rectifier filter circuit includes a rectifier bridge DB1, a resistor R9, a capacitor CC1, and a capacitor EC1. The input terminal of the rectifier bridge DB1 is connected to the EMI circuit, and the output terminal of the rectifier bridge DB1 is connected to one end of the resistor R9, one end of the capacitor CC1, and one end of the capacitor EC1, respectively. The other ends of the resistor R9, the capacitor CC1, and the capacitor EC1 are all grounded, and the other end of the capacitor EC1 is electrically connected to the RC snubber circuit.

[0008] Preferably, the RC snubber circuit includes a primary RC snubber circuit and a secondary RC snubber circuit. The primary RC snubber circuit includes resistors R10, R11, R12, R13, R14, R15, and RL1, capacitor CC3, and diode D3. The secondary RC snubber circuit includes capacitor C20, resistors R50, R51, R52, and R53, and capacitor CC6.

[0009] Preferably, the output rectifier filter circuit includes diode D10, capacitor EC5, capacitor EC6, capacitor EC7, and conjugate coil LF4.

[0010] Preferably, the feedback circuit includes diode ZD3, optocoupler OC1A, resistors R62, R63, R64, R65, R66, R67, capacitors C9, C10, C11, and voltage regulator IC U2.

[0011] Preferably, the step-down circuit includes a conjugate coil LF5, a processor U3, and a filter circuit.

[0012] The beneficial effects of this utility model are:

[0013] This utility model provides a drive circuit for a height-adjustable desk, including an EMI circuit, a rectifier and filter circuit, an RC snubber circuit, a transformer, an output rectifier and filter circuit, a controller, a control component, an overcurrent and overvoltage protection circuit, a feedback circuit, and a step-down circuit. The input terminal of the EMI circuit is connected to the mains power, and the output terminal of the EMI circuit is connected to the input terminal of the rectifier and filter circuit. The output terminal of the rectifier and filter circuit is connected to the input terminal of the RC snubber circuit and the controller. The output terminal of the RC snubber circuit is connected to the high-voltage side of the transformer, and the low-voltage side of the transformer is connected to the input terminal of the output rectifier and filter circuit. The output terminal of the output rectifier and filter circuit is connected to the step-down circuit. The control component, the overcurrent and overvoltage protection circuit, and the feedback circuit are all electrically connected to the controller. This utility model can supply power to the height-adjustable motor through the EMI circuit, rectifier and filter circuit, RC snubber circuit, transformer, output rectifier and filter circuit, and step-down circuit, and can control the height-adjustable motor through the control component and controller. The circuit design of this utility model is simple and the manufacturing cost is low. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 The circuit diagrams are for the EMI circuit, rectifier filter circuit, RC absorption circuit, transformer, output rectifier filter circuit, controller, control components, and overcurrent and overvoltage protection circuit of this utility model.

[0016] Figure 2 This is a diagram of the step-down circuit of this utility model;

[0017] Figure 3 This is the feedback circuit diagram of this utility model. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0023] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] like Figure 1-3As shown, a drive circuit for a height-adjustable desk includes an EMI circuit, a rectifier and filter circuit, an RC snubber circuit, a transformer, an output rectifier and filter circuit, a controller, a control component, an overcurrent and overvoltage protection circuit, a feedback circuit, and a step-down circuit. The input terminal of the EMI circuit is connected to the mains power, and the output terminal of the EMI circuit is connected to the input terminal of the rectifier and filter circuit. The output terminal of the rectifier and filter circuit is connected to the input terminal of the RC snubber circuit and the controller, respectively. The output terminal of the RC snubber circuit is connected to the high-voltage side of the transformer, and the low-voltage side of the transformer is connected to the input terminal of the output rectifier and filter circuit. The output terminal of the output rectifier and filter circuit is connected to the step-down circuit. The control component, the overcurrent and overvoltage protection circuit, and the feedback circuit are all electrically connected to the controller. This invention can power the height-adjustable motor through the EMI circuit, rectifier and filter circuit, RC snubber circuit, transformer, output rectifier and filter circuit, and step-down circuit, and can control the height-adjustable motor through the control component and controller. The circuit design of this invention is simple and the manufacturing cost is low.

[0025] like Figure 1 As shown, in this embodiment, the EMI circuit includes a conjugate coil LF1, a varistor MOV1, a conjugate coil LF2, and a conjugate coil LF3. A fuse is provided between the conjugate coil LF1 and the mains power.

[0026] like Figure 1 As shown, in this embodiment, the rectifier filter circuit includes a rectifier bridge DB1, a resistor R9, a capacitor CC1, and a capacitor EC1. The input terminal of the rectifier bridge DB1 is connected to the EMI circuit, and the output terminal of the rectifier bridge DB1 is connected to one end of the resistor R9, one end of the capacitor CC1, and one end of the capacitor EC1, respectively. The other ends of the resistor R9, the capacitor CC1, and the capacitor EC1 are all grounded, and the other end of the capacitor EC1 is electrically connected to the RC snubber circuit.

[0027] like Figure 1 As shown, in this embodiment, the RC snubber circuit includes a primary RC snubber circuit and a secondary RC snubber circuit. The primary RC snubber circuit includes resistors R10, R11, R12, R13, R14, R15, and RL1, capacitor CC3, and diode D3. The secondary RC snubber circuit includes capacitor C20, resistors R50, R51, R52, and R53, and capacitor CC6.

[0028] Specifically, EMI circuits, rectifier filter circuits, RC snubber circuits, transformers, and output rectifier filter circuits can be used to convert AC mains power to +33V.

[0029] like Figure 1 As shown, in this embodiment, the output rectifier filter circuit includes diode D10, capacitor EC5, capacitor EC6, capacitor EC7, and conjugate coil LF4.

[0030] like Figure 3 As shown, in this embodiment, the feedback circuit includes diode ZD3, optocoupler OC1A, resistors R62, R63, R64, R65, R66, and R67, capacitors C9, C10, and C11, and voltage regulator IC U2. The feedback circuit is used to provide feedback on the height of the lifting table to the controller.

[0031] like Figure 2 As shown, in this embodiment, the step-down circuit includes a conjugate coil LF5, a processor U3, and a filter circuit. The step-down circuit of this utility model is used to reduce the voltage of +33V to +5.7V.

[0032] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A drive circuit for a height-adjustable desk, characterized in that: The system includes an EMI circuit, a rectifier and filter circuit, an RC snubber circuit, a transformer, an output rectifier and filter circuit, a controller, a control component, an overcurrent and overvoltage protection circuit, a feedback circuit, and a step-down circuit. The input terminal of the EMI circuit is connected to the mains power, and the output terminal of the EMI circuit is connected to the input terminal of the rectifier and filter circuit. The output terminal of the rectifier and filter circuit is connected to the input terminal of the RC snubber circuit and the controller. The output terminal of the RC snubber circuit is connected to the high-voltage side of the transformer, and the low-voltage side of the transformer is connected to the input terminal of the output rectifier and filter circuit. The output terminal of the output rectifier and filter circuit is connected to the step-down circuit. The control component, the overcurrent and overvoltage protection circuit, and the feedback circuit are all electrically connected to the controller.

2. The drive circuit for a height-adjustable desk according to claim 1, characterized in that: The EMI circuit includes a conjugate coil LF1, a varistor MOV1, a conjugate coil LF2, and a conjugate coil LF3. A fuse is provided between the conjugate coil LF1 and the mains power.

3. The drive circuit for a height-adjustable desk according to claim 1, characterized in that: The rectifier and filter circuit includes a rectifier bridge DB1, a resistor R9, a capacitor CC1, and a capacitor EC1. The input terminal of the rectifier bridge DB1 is connected to the EMI circuit, and the output terminal of the rectifier bridge DB1 is connected to one end of the resistor R9, one end of the capacitor CC1, and one end of the capacitor EC1, respectively. The other ends of the resistor R9, the capacitor CC1, and the capacitor EC1 are all grounded, and the other end of the capacitor EC1 is electrically connected to the RC snubber circuit.

4. The drive circuit for a height-adjustable desk according to claim 1, characterized in that: The RC snubber circuit includes a primary RC snubber circuit and a secondary RC snubber circuit. The primary RC snubber circuit includes resistors R10, R11, R12, R13, R14, R15, and RL1, capacitor CC3, and diode D3. The secondary RC snubber circuit includes capacitor C20, resistors R50, R51, R52, and R53, and capacitor CC6.

5. A drive circuit for a height-adjustable desk according to claim 1, characterized in that: The output rectifier and filter circuit includes diode D10, capacitor EC5, capacitor EC6, capacitor EC7, and conjugate coil LF4.

6. The drive circuit for a height-adjustable desk according to claim 1, characterized in that: The feedback circuit includes diode ZD3, optocoupler OC1A, resistors R62, R63, R64, R65, R66, and R67, capacitors C9, C10, and C11, and voltage regulator IC U2.

7. A drive circuit for a height-adjustable desk according to claim 1, characterized in that: The step-down circuit includes a conjugate coil LF5, a processor U3, and a filter circuit.

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