Motor driving circuit and driving method of lifting table

Abstract

The invention belongs to the technical field of lifting tables, and discloses a motor driving circuit and driving method of a lifting table, and the driving circuit comprises a power input module, a voltage conversion module, an MCU control module, a motor driving module and a current sampling module. The power input module provides a first voltage signal for a motor driving circuit of the lifting table and outputs the first voltage signal to the voltage conversion module; the voltage conversion module converts the first voltage signal into a second voltage signal and outputs the second voltage signal to the MCU control module; the MCU control module controls the rotation of the driving motor according to the received second voltage signal, and sends a first control signal to the motor driving module; the motor driving module controls the on-off of the MOS tube according to the first control signal; the current sampling module collects a first current signal in real time when the MOS tube is conducted, converts the first current signal into a third voltage signal and outputs the third voltage signal to the MCU control module so as to control rotation of the driving motor. According to the driving circuit, the lifting table can work normally when encountering resistance.

Description

Technical Field

[0001] The present invention belongs to the technical field of lifting tables, and in particular relates to a motor driving circuit and a driving method of a lifting table. Background Art

[0002] A height-adjustable table is a table designed to accommodate users of different heights or to meet the needs of users switching between sitting and standing positions. It adjusts the height of the tabletop through mechanisms such as electric motors, gas pressure rods or mechanical knobs. Height-adjustable tables are widely used in offices, home study rooms, schools and other places to promote a healthy working and learning environment and reduce health problems caused by long periods of sitting, such as cervical spondylosis and back pain. However, existing height-adjustable tables may encounter some resistance during the lifting process, such as heavy objects placed on the table or failure of the table's mechanical structure, which may cause the height-adjustable table to fail to rise or fall normally or to descend too slowly, causing many inconveniences to users.

[0003] Therefore, how to make the lifting table work normally when encountering obstacles is a problem that needs to be solved urgently. Summary of the invention

[0004] In order to solve the technical problem that the existing lifting table cannot work normally when encountering obstacles, the present invention provides a motor driving circuit and driving method of the lifting table.

[0005] In a first aspect, the present invention provides a motor drive circuit for a lifting table, including a power input module, a voltage conversion module, an MCU control module, a motor drive module, and a current sampling module;

[0006] The power input module is connected to the voltage conversion module, and the power input module is used to provide a first voltage signal to the motor drive circuit of the lifting table, and output the first voltage signal to the voltage conversion module;

[0007] The voltage conversion module is connected to the MCU control module, and the voltage conversion module is used to convert the first voltage signal into a second voltage signal, and output the second voltage signal to the MCU control module;

[0008] The MCU control module is connected to the motor drive module, and the MCU control module controls the rotation of the drive motor according to the received second voltage signal, and sends a first control signal to the motor drive module;

[0009] The motor driving module is connected to the current sampling module, and the motor driving module controls the on-off of the MOS tube according to the received first control signal, and outputs the on-off signal of the MOS tube to the current sampling module;

[0010] The current sampling module is connected to the MCU control module. The current sampling module is used to collect the first current signal when the MOS tube is turned on in real time, and convert the collected first current signal into a third voltage signal and output it to the MCU control module. The MCU control module controls the rotation of the drive motor according to the received third voltage signal.

[0011] Preferably, the power input module includes a first voltage source, the voltage conversion module includes a first sampling resistor, a first input pin and a first output pin, and the MCU control module includes a second voltage source pin;

[0012] One end of the first sampling resistor is connected to the first voltage source, the other end of the first sampling resistor is connected to the first input pin, and the first output pin is connected to the second voltage source.

[0013] Preferably, the motor driving module includes a voltage conversion unit, a second sampling resistor and an H-bridge unit, and the MCU control module includes a first signal control pin;

[0014] A first end of the voltage conversion unit is connected to the first signal control pin, a second end of the voltage conversion unit is connected to one end of the second sampling resistor, and a second end of the second sampling resistor is connected to the H-bridge unit.

[0015] Preferably, the current sampling module includes an input signal unit, a third sampling resistor and an output signal unit, and the MCU control module includes a second signal control pin;

[0016] The input signal unit is connected to the H-bridge unit, the first end of the third sampling resistor is connected to the input signal unit, the second end of the third sampling resistor is connected to the first end of the output signal unit, and the second end of the output signal unit is connected to the second control signal pin.

[0017] Preferably, the motor drive circuit also includes a voltage sampling module, which is connected to the MCU control module, and is used to collect a first voltage signal and control the working state of the motor drive circuit of the lifting table according to the collected first voltage signal.

[0018] Preferably, the voltage sampling module includes a third sampling resistor, the MCU control module includes a third voltage source pin, a first end of the third sampling resistor is connected to an external voltage source, and a second end of the third sampling resistor is connected to the third voltage source pin.

[0019] In a second aspect, the present invention further provides a motor driving method for a lifting table, comprising:

[0020] The power input module provides a first voltage signal to the driving motor of the lifting table, and outputs the first voltage signal to the voltage conversion module;

[0021] The voltage conversion module converts the first voltage signal into a second voltage signal, and outputs the second voltage signal to the MCU control module;

[0022] The MCU control module controls the rotation of the drive motor according to the received second voltage signal, and sends a first control signal to the motor drive module;

[0023] The motor driving module controls the on-off of the MOS tube according to the received first control signal, and outputs the on-off signal of the MOS tube to the current sampling module;

[0024] The current sampling module collects the first current signal when the MOS tube is turned on in real time, and converts the collected first current signal into a third voltage signal and outputs it to the MCU control module, and the MCU control module controls the rotation of the drive motor according to the received third voltage signal.

[0025] Preferably, the motor driving method further comprises:

[0026] The current signal when the lifting table encounters resistance is preset as the first preset current signal;

[0027] The first current signal collected in real time by the current sampling module is compared with the first preset current signal, and the driving motor is controlled to lift the lifting table according to the comparison result.

[0028] Preferably, comparing the first current signal collected in real time by the current sampling module with the first preset current signal, and controlling the drive motor to lift the lifting table according to the comparison result, includes:

[0029] If the first current signal is less than the first preset current signal, the MCU control module sends a height adjustment instruction of the lifting table to the driving motor, and the driving motor controls the lifting of the lifting table according to the received height adjustment instruction of the lifting table;

[0030] If the first current signal is greater than or equal to the first preset current signal, the MCU control module sends a lifting table retraction instruction to the drive motor, and the drive motor controls the lifting table to retract a first preset distance according to the received lifting table retraction instruction.

[0031] Compared with the prior art, the present invention provides a motor drive circuit and a drive method for a lifting table, wherein the motor drive module controls the on and off of the MOS tube according to the received first control signal, and outputs the on and off signal of the MOS tube to the current sampling module; the current sampling module is connected to the MCU control module, and the current sampling module is used to collect the first current signal when the MOS tube is turned on in real time, and convert the collected first current signal into a third voltage signal and output it to the MCU control module, and the MCU control module controls the rotation of the drive motor according to the received third voltage signal. The present invention collects the current signal of the motor drive module in real time through the current sampling module, and detects whether the drive motor encounters resistance through the current signal. When it is detected that the drive motor encounters resistance, the drive motor is controlled to retreat to ensure that the lifting table can work normally when encountering resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only part of the embodiments of the present invention, rather than all of the embodiments. For ordinary technicians in this field, without paying creative work, other drawings obtained based on these drawings all fall within the scope of protection of the present invention.

[0033] Figure 1 A schematic diagram of the framework structure of a motor drive circuit of a lifting table provided in an embodiment of the present invention;

[0034] Figure 2 A schematic diagram of a circuit structure of a voltage conversion module provided by an embodiment of the present invention;

[0035] Figure 3 A schematic diagram of the circuit structure of an MCU control module provided in an embodiment of the present invention;

[0036] Figure 4 A schematic diagram of a circuit structure of a motor drive module provided by an embodiment of the present invention;

[0037] Figure 5 A schematic diagram of the circuit structure of a current sampling module provided in an embodiment of the present invention;

[0038] Figure 6 A schematic diagram of the circuit structure of a voltage sampling module provided by an embodiment of the present invention;

[0039] Figure 7 A schematic flow chart of a motor driving method for a lift table provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0041] In order to make the description of the content of the present invention more detailed and complete, the following is an illustrative description of the implementation method and specific examples of the present invention; however, this is not the only form of implementing or applying the specific embodiments of the present invention. The implementation method covers the features of multiple specific embodiments and the method steps and their sequence for constructing and operating these specific embodiments. However, other specific embodiments can also be used to achieve the same or equal functions and step sequences. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0042] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0043] In the description of the embodiments of the present invention, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present invention, “multiple” means two or more than two, and other quantifiers are similar. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention, and the embodiments of the present invention and the features in the embodiments may be combined with each other without conflict.

[0044] In order to solve the technical problem that the lifting table cannot work normally when encountering obstacles, the present invention provides a motor driving circuit for the lifting table, please refer to Figure 1 , Figure 1A schematic diagram of the framework structure of a motor drive circuit of a lifting table provided in an embodiment of the present invention, wherein the motor drive circuit of the lifting table includes a power input module 10, a voltage conversion module 20, an MCU control module 30, a motor drive module 40 and a current sampling module 50; the power input module 10 is connected to the voltage conversion module 20, and the power input module 10 is used to provide a first voltage signal to the motor drive circuit of the lifting table, and output the first voltage signal to the voltage conversion module 20; the voltage conversion module 20 is connected to the MCU control module 30, and the voltage conversion module 20 is used to convert the first voltage signal into a second voltage signal, and output the second voltage signal to the MCU control module 30; the MCU control module 30 is connected to the motor The motor drive module 40 is connected to the MCU control module 30, and the MCU control module 30 controls the rotation of the drive motor according to the received second voltage signal, and sends a first control signal to the motor drive module 40; the motor drive module 40 is connected to the current sampling module 50, and the motor drive module 40 controls the on and off of the MOS tube according to the received first control signal, and outputs the on and off signal of the MOS tube to the current sampling module 50; the current sampling module 50 is connected to the MCU control module 30, and the current sampling module 50 is used to collect the first current signal when the MOS tube is turned on in real time, and convert the collected first current signal into a third voltage signal and output it to the MCU control module 30, and the MCU control module 30 controls the rotation of the drive motor according to the received third voltage signal. The present invention collects the current signal of the motor drive module 40 in real time through the current sampling module 50, and detects whether the drive motor encounters resistance through the current signal. When it is detected that the drive motor encounters resistance, the drive motor is controlled to retreat to ensure that the lifting table can still work normally when encountering resistance.

[0045] As an implementation, please refer to Figure 2-3 , Figure 2 A schematic diagram of a circuit structure of a voltage conversion module provided by an embodiment of the present invention, Figure 3A circuit structure diagram of an MCU control module provided in an embodiment of the present invention, wherein the power input module 10 includes a first voltage source VCC_24V, the voltage conversion module 20 includes a first sampling resistor, a first input pin VI N and a first output pin VOUT, and the MCU control module 30 includes a second voltage source pin VCC_3V3; one end of the first sampling resistor is connected to the first voltage source VCC_24V, the other end of the first sampling resistor is connected to the first input pin VI N, and the first output pin VOUT is connected to the second voltage source VCC_3V3. Specifically, in an embodiment of the present invention, the first sampling resistor includes a resistor R25 and a resistor R26, the first voltage source is a 24V or 12V voltage signal, the second voltage source is a 3.3V voltage signal, and the voltage conversion module 20 needs to convert the 24V or 12V voltage signal into a 3.3V voltage signal to power the MCU control module 30. In addition, the voltage conversion module 20 further includes a capacitor C10 , a capacitor C11 and a capacitor C16 , and the capacitor C10 , the capacitor C11 and the capacitor C16 are used to filter out interference signals generated in the voltage conversion module 20 .

[0046] As an implementation, please refer to Figure 4 , Figure 4 A circuit structure diagram of a motor drive module provided in an embodiment of the present invention, the motor drive module 40 includes a voltage conversion unit, a second sampling resistor and an H-bridge unit, the MCU control module 30 includes a first signal control pin; the first end of the voltage conversion unit is connected to the first signal control pin, the second end of the voltage conversion unit is connected to one end of the second sampling resistor, and the second end of the second sampling resistor is connected to the H-bridge unit. Specifically, in an embodiment of the present invention, the voltage conversion unit in the motor drive module 40 converts the low-level signal input by the MCU control module 30 into a high-level signal, and the third sampling resistors R1-R7 are used to collect the converted high-level signal to control the opening and closing of the MOS tubes in the three H-bridge circuits.

[0047] As an implementation, please refer to Figure 5 , Figure 5A circuit structure diagram of a current sampling module provided in an embodiment of the present invention, the current sampling module 50 includes an input signal unit, a third sampling resistor and an output signal unit, and the MCU control module 30 includes a second signal control pin; the input signal unit is connected to the H-bridge unit, the first end of the third sampling resistor is connected to the input signal unit, the second end of the third sampling resistor is connected to the first end of the output signal unit, and the second end of the output signal unit is connected to the second control signal pin. Specifically, in an embodiment of the present invention, the input signal unit is a UG signal, a VG signal and a WG signal, the input signal unit is connected to the H-bridge unit to detect the current signal of the motor drive module 40 in real time, and the signal output unit is a SENS_I UP signal, a SENS_IUN signal, a SENS_IWP signal, a SENS_IWN signal, a SENS_IVP signal and a SENS_IVN signal; the second end of the output signal unit is connected to the second signal control pin of the MCU control module 30, and the collected current signal of the motor drive module 40 is output to the MCU control module 30.

[0048] As an implementation method, the motor drive circuit further includes a voltage sampling module 60, which is connected to the MCU control module 30. The voltage sampling module 60 is used to collect a first voltage signal and control the working state of the motor drive circuit of the lifting table according to the collected first voltage signal. Specifically, in an embodiment of the present invention, the voltage sampling module 60 is used to collect a first voltage signal provided externally. If the detected first voltage signal exceeds the working voltage, the motor drive circuit is controlled to stop working to prevent the input external voltage from burning the motor drive circuit of the lifting table.

[0049] As an implementation, please refer to Figure 6 , Figure 6 A circuit structure diagram of a voltage sampling module provided in an embodiment of the present invention, wherein the voltage sampling module 60 includes a third sampling resistor, the MCU control module 30 includes a third voltage source pin VBAT_ADC, the first end of the third sampling resistor is connected to an external voltage source, and the second end of the third sampling resistor is connected to the third voltage source pin VBAT_ADC. Specifically, in an embodiment of the present invention, the third sampling resistor is R27, R31 and R19, and the third sampling resistor is used to collect a first voltage signal provided externally. In addition, the voltage sampling module 60 also includes a filter capacitor C19, and the filter capacitor C19 is used to filter out interference signals generated by the voltage sampling module 60.

[0050] In addition, the motor driving circuit further includes a reset module, which includes a capacitor C6, a resistor R8 and a resistor R4. The MCU control module 30 includes a reset pin RESETN, which is connected to the capacitor C6 and the resistor R8 respectively.

[0051] Based on the motor driving circuit of the lifting table, the present invention also provides a motor driving method of the lifting table, which can be executed by software and / or hardware devices. For example, please refer to Figure 7 , Figure 7 A flow chart of a motor driving method for a lifting table provided in an embodiment of the present invention, the motor driving method for the lifting table comprising: S101, obtaining a power input module to provide a first voltage signal to a driving motor of the lifting table, and outputting the first voltage signal to a voltage conversion module; S102, the voltage conversion module converts the first voltage signal into a second voltage signal, and outputs the second voltage signal to an MCU control module; S103, the MCU control module controls the rotation of the driving motor according to the received second voltage signal, and sends a first control signal to the motor driving module; S104, the motor driving module controls the on and off of the MOS tube according to the received first control signal, and outputs the on and off signal of the MOS tube to a current sampling module; S105, the current sampling module collects the first current signal when the MOS tube is turned on in real time, and converts the collected first current signal into a third voltage signal and outputs it to the MCU control module, and the MCU control module controls the rotation of the driving motor according to the received third voltage signal. The control method of the lifting table provided in the embodiment of the present invention adds a current sampling module to collect the current signal of the motor driving module in real time, and detects whether the driving motor encounters obstruction through the current signal. When it is detected that the driving motor encounters obstruction, the driving motor is controlled to retreat to ensure that the lifting table can work normally when encountering obstruction.

[0052] Preferably, the motor driving method further includes: presetting the current signal when the lifting table encounters resistance as a first preset current signal; comparing the first current signal collected in real time by the current sampling module with the first preset current signal, and controlling the drive motor to lift the lifting table according to the comparison result. Specifically, in an embodiment of the present invention, the first current signal when the MOS tube is turned on can be collected in real time, and the first current signal can be used to determine whether the drive motor of the lifting table encounters resistance. If the detected first current signal becomes larger, but does not exceed 2 times the working current, whether the drive motor of the lifting table encounters resistance, the drive motor can rebound the lifting table, but does not stop working. If the detected first current signal exceeds 2 times the working current, the drive motor is controlled to stop working.

[0053] Preferably, the first current signal collected in real time by the current sampling module is compared with the first preset current signal, and the drive motor is controlled to lift the lifting table according to the comparison result, including: if the first current signal is less than the first preset current signal, the MCU control module sends a height adjustment instruction of the lifting table to the drive motor, and the drive motor controls the lifting of the lifting table according to the received height adjustment instruction of the lifting table; if the first current signal is greater than or equal to the first preset current signal, the MCU control module sends a lifting table retraction instruction to the drive motor, and the drive motor controls the lifting table to retract the first preset distance according to the received lifting table retraction instruction. It should be noted that the first preset distance in the present invention can be set according to actual needs, and can be set to 10 cm or 12 cm. It is set according to actual needs, and the present invention does not make further restrictions.

[0054] Preferably, the motor driving method further includes: obtaining an external voltage signal collected in real time by a voltage sampling module, and comparing the external voltage signal with the working voltage of the lifting table; if the external voltage signal is greater than the working voltage of the lifting table, the MCU control module controls the driving motor of the lifting table to stop working. Specifically, in an embodiment of the present invention, if the detected external voltage signal exceeds the working voltage, the motor driving circuit is controlled to stop working to prevent the input external voltage from damaging the control motor driving circuit.

[0055] The motor driving method for a lifting table provided in an embodiment of the present invention can execute the technical solution of the motor driving circuit of the lifting table in any of the above-mentioned embodiments. Its implementation principle and beneficial effects are similar to the implementation principle and beneficial effects of the motor driving circuit of the lifting table. Please refer to the implementation principle and beneficial effects of the motor driving circuit of the lifting table, which will not be repeated here.

[0056] In the several embodiments provided by the present invention, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0057] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of software functional units. The above is only an implementation mode of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present invention.

[0058] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Although the present invention has been disclosed as above in the form of preferred embodiments, it is not intended to limit the present invention. Any technical personnel in the field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A motor drive circuit for a lifting table, characterized in that: Including power input module, voltage conversion module, MCU control module, motor drive module and current sampling module; The power input module is connected to the voltage conversion module, and the power input module is used to provide a first voltage signal to the motor drive circuit of the lifting table, and output the first voltage signal to the voltage conversion module; The voltage conversion module is connected to the MCU control module, and the voltage conversion module is used to convert the first voltage signal into a second voltage signal, and output the second voltage signal to the MCU control module; The MCU control module is connected to the motor drive module, and the MCU control module controls the rotation of the drive motor according to the received second voltage signal, and sends a first control signal to the motor drive module; The motor driving module is connected to the current sampling module, and the motor driving module controls the on-off of the MOS tube according to the received first control signal, and outputs the on-off signal of the MOS tube to the current sampling module; The current sampling module is connected to the MCU control module. The current sampling module is used to collect the first current signal when the MOS tube is turned on in real time, and convert the collected first current signal into a third voltage signal and output it to the MCU control module. The MCU control module controls the rotation of the drive motor according to the received third voltage signal.

2. The motor driving circuit of the lifting table according to claim 1, characterized in that: The power input module includes a first voltage source, the voltage conversion module includes a first sampling resistor, a first input pin and a first output pin, and the MCU control module includes a second voltage source pin; One end of the first sampling resistor is connected to the first voltage source, the other end of the first sampling resistor is connected to the first input pin, and the first output pin is connected to the second voltage source.

3. The motor driving circuit of the lifting table according to claim 2, characterized in that: The motor driving module includes a voltage conversion unit, a second sampling resistor and an H-bridge unit, and the MCU control module includes a first signal control pin; A first end of the voltage conversion unit is connected to the first signal control pin, a second end of the voltage conversion unit is connected to one end of the second sampling resistor, and a second end of the second sampling resistor is connected to the H-bridge unit.

4. The motor driving circuit of the lifting table according to claim 3, characterized in that: The current sampling module includes an input signal unit, a third sampling resistor and an output signal unit, and the MCU control module includes a second signal control pin; The input signal unit is connected to the H-bridge unit, the first end of the third sampling resistor is connected to the input signal unit, the second end of the third sampling resistor is connected to the first end of the output signal unit, and the second end of the output signal unit is connected to the second control signal pin.

5. The motor driving circuit of the lifting table according to claim 4, characterized in that: The motor drive circuit also includes a voltage sampling module, which is connected to the MCU control module. The voltage sampling module is used to collect a first voltage signal and control the working state of the motor drive circuit of the lifting table according to the collected first voltage signal.

6. The motor driving circuit of the lifting table according to claim 5, characterized in that: The voltage sampling module includes a third sampling resistor, the MCU control module includes a third voltage source pin, a first end of the third sampling resistor is connected to an external voltage source, and a second end of the third sampling resistor is connected to the third voltage source pin.

7. A motor driving method for a lifting table, characterized in that: include: The power input module provides a first voltage signal to the driving motor of the lifting table, and outputs the first voltage signal to the voltage conversion module; The voltage conversion module converts the first voltage signal into a second voltage signal, and outputs the second voltage signal to the MCU control module; The MCU control module controls the rotation of the drive motor according to the received second voltage signal, and sends a first control signal to the motor drive module; The motor driving module controls the on-off of the MOS tube according to the received first control signal, and outputs the on-off signal of the MOS tube to the current sampling module; The current sampling module collects the first current signal when the MOS tube is turned on in real time, and converts the collected first current signal into a third voltage signal and outputs it to the MCU control module, and the MCU control module controls the rotation of the drive motor according to the received third voltage signal.

8. The motor driving method of a lifting table according to claim 7, characterized in that: The motor driving method further comprises: The current signal when the lifting table encounters resistance is preset as the first preset current signal; The first current signal collected in real time by the current sampling module is compared with the first preset current signal, and the driving motor is controlled to lift the lifting table according to the comparison result.

9. The motor driving method of a lifting table according to claim 8, characterized in that: The method of comparing the first current signal collected in real time by the current sampling module with the first preset current signal, and controlling the driving motor to lift the lifting table according to the comparison result, comprises: If the first current signal is less than the first preset current signal, the MCU control module sends a height adjustment instruction of the lifting table to the driving motor, and the driving motor controls the lifting of the lifting table according to the received height adjustment instruction of the lifting table; If the first current signal is greater than or equal to the first preset current signal, the MCU control module sends a lifting table retraction instruction to the drive motor, and the drive motor controls the lifting table to retract a first preset distance according to the received lifting table retraction instruction.

10. The motor driving method of a lifting table according to claim 9, characterized in that: The motor driving method further comprises: Acquire the external voltage signal collected in real time by the voltage sampling module, and compare the external voltage signal with the working voltage of the lifting table; If the external voltage signal is greater than the operating voltage of the lifting table, the MCU control module controls the driving motor of the lifting table to stop working.

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