Intelligent safety electric control system matched with single-column synchronous lifting heating tea table

Abstract

The application discloses an intelligent safety electric control system matched with a single-column synchronous lifting heating tea table, belongs to the technical field of intelligent electric control of heating furniture, and discloses a light-weight heating tea table which comprises a base, a single-column lifting stand fixed in the middle of the base and a table top supported by the lifting stand, and an electric control system which comprises a static main control area, a follow-up function area and a hidden wiring link; the static main control area comprises an integrated main control circuit which is sunkly installed in a cavity in the base, the integrated main control circuit comprises a main control chip and a power conversion unit, the input end of the power conversion unit is connected with commercial power, the power output branch of the power conversion unit is connected with a power load, and the low-voltage output branch of the power conversion unit is connected with the main control chip; the application adopts static and dynamic partition electric control layout, strong and weak electric isolation hidden wiring and independent hardware stroke limiting design for the single-column synchronous lifting heating tea table, and effectively improves lifting stability, electric control operation reliability and safety protection level.

Description

Technical Field

[0001] This invention belongs to the field of intelligent electronic control technology for heating furniture, specifically an intelligent safety electronic control system adapted to a single-column synchronous lifting heating coffee table. Background Technology

[0002] With the development of integrated home appliances, height-adjustable coffee tables with heating functions have become a mainstream category of living room furniture due to their multiple features, including storage, heating, and height adjustment. In recent years, single-column synchronous height-adjustable coffee tables with heating have gradually replaced traditional double / multi-column support structures due to their advantages of single-column central support, simple structure, small footprint, and lightweight appearance, becoming an important direction for lightweight development in the industry. However, most existing single-column height-adjustable coffee tables with heating directly adopt the architecture of traditional double-column products, without specifically adapting and optimizing for the spatial characteristics and operating features of single-column structures. This results in many technical defects, hindering the improvement of product performance and reliability.

[0003] First, the layout of the electronic control components is unreasonable, lacking a static and dynamic partition design adapted to single-column lifting. Existing solutions generally integrate the main control circuit with functional components such as heating and sensing under the tabletop, raising and lowering synchronously with the tabletop. This significantly increases the load weight during lifting, exacerbating the swaying of the single-column support structure and reducing the stability of lifting. Furthermore, core components such as the main control chip are subjected to long-term vibration and impact during lifting, making them prone to problems such as loosening of components and desoldering of solder joints, resulting in increased failure rate and significantly shortened service life.

[0004] Secondly, the wiring design is poorly compatible with the single-column lifting structure, resulting in insufficient reliability and aesthetics. Existing single-column heated coffee tables often have exposed electrical wiring, or simply run the wiring through the column without any lifting adaptation design. Exposed wiring disrupts the product's lightweight and minimalist appearance. Furthermore, ordinary fixed-length cables are subjected to continuous pulling, bending, and jamming during repeated lifting and lowering of the tabletop, easily causing insulation damage and wire breakage, leading to safety hazards such as open circuits and leakage. The cables also have short lifespans and are unsuitable for the high-frequency lifting and lowering scenarios of single-column structures.

[0005] Furthermore, the safety protection mechanism of the lifting drive has shortcomings, lacking independent hardware-level limit protection. Existing single-column lifting systems generally rely solely on the main control software in conjunction with position sensors to achieve travel limits. The limit logic depends entirely on the stability of program operation and signal transmission. Once there is an abnormality in the main control program, a failure in the position sensor, or an interruption in signal transmission, the lifting travel will lose effective constraint, making it extremely easy for mechanical failures such as the platform hitting the top or falling to the bottom to occur.

[0006] In summary, an intelligent safety electronic control system adapted to a single-column synchronous lifting and heating coffee table needs to be developed to solve the above technical problems. Summary of the Invention

[0007] To address the above problems, this invention provides an intelligent safety electronic control system adapted to a single-column synchronous lifting and heating coffee table, which solves the technical problems in the background art.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] A smart safety electronic control system is adapted to a single-column synchronous lifting and heating coffee table. The lightweight heating coffee table includes a base, a single-column lifting column fixed in the center on the base, and a tabletop supported by the lifting column. The electronic control system includes a static main control area, a follow-up function area, and a concealed wiring link.

[0010] The static main control area includes an integrated main control circuit, which is recessed and installed in the cavity inside the base. The integrated main control circuit includes a main control chip and a power conversion unit. The input terminal of the power conversion unit is connected to the mains power, the power output branch of the power conversion unit is connected to the power load, and the low-voltage output branch of the power conversion unit is connected to the main control chip.

[0011] The follow-up functional area includes a frequency conversion heating circuit, a temperature detection circuit, a heating on / off circuit, and an expansion interface circuit. The heating element of the frequency conversion heating circuit, the sensor of the temperature detection circuit, the human body sensing unit of the heating on / off circuit, and the interaction unit of the expansion interface circuit are all fixed to the lower side of the table and rise and fall synchronously with the table.

[0012] The concealed wiring link includes electrical connection wires that pass through the wiring channel inside the lifting column. The first end of the electrical connection wire is electrically connected to the integrated main control circuit, and the second end of the electrical connection wire is electrically connected to each circuit in the follow-up functional area.

[0013] The electronic control system also includes a lifting drive circuit, which includes an electric push rod, an electric push rod drive unit, and a hardware travel limit unit. The electric push rod is installed inside the single-column lifting column and its output end is connected to the platform. The hardware travel limit unit includes an upper limit switch connected in series in the upward power supply branch of the electric push rod drive unit and a lower limit switch connected in series in the downward power supply branch of the electric push rod drive unit.

[0014] As a further improvement to the above scheme, the heating power supply circuit of the frequency conversion heating circuit is connected in series with an overheat protection device, a short circuit protection device, and a leakage protection device.

[0015] As a further improvement to the above scheme, the temperature detection circuit includes a first NTC temperature sensor and a second NTC temperature sensor, with the signal lines of the first NTC temperature sensor and the second NTC temperature sensor respectively connected to the two sampling ports of the main control chip.

[0016] As a further improvement to the above scheme, the heating on / off circuit includes a human body sensing unit and an interlocking switch unit. The interlocking switch unit is connected in series in the heating power supply circuit. The output terminal of the human body sensing unit is connected to the input port of the main control chip. The main control chip controls the on / off of the interlocking switch unit based on the human body presence signal output by the human body sensing unit.

[0017] As a further improvement to the above solution, the power conversion unit includes an AC-DC conversion module and a voltage regulator module. The AC-DC conversion module converts the mains power into a first DC voltage and supplies power to the electric actuator drive unit through the power output branch. The voltage regulator module steps down the first DC voltage to a second DC voltage and supplies power to the main control chip, temperature detection circuit and human body sensing unit through the low voltage output branch. The heating power supply circuit is directly powered by the mains power, and overheat protection devices, short circuit protection devices and leakage protection devices are connected in series in the power supply path between the mains power and the heating element.

[0018] As a further improvement to the above scheme, the heating element includes a first heating core and a second heating core connected in parallel to the heating power supply circuit. The frequency conversion heating circuit also includes a frequency conversion drive unit connected to the main control chip. The frequency conversion drive unit includes two pulse width modulation drive branches that control the power of the first heating core and the second heating core respectively. The overheat protection device is a normally closed temperature control switch, which is mounted on the heat dissipation surface of the first heating core. The short circuit protection device is a fuse. The leakage protection device is a residual current operated device. When any one of the overheat protection device, short circuit protection device, and leakage protection device operates, the power supply to the first heating core and the second heating core is cut off simultaneously.

[0019] As a further improvement to the above scheme, the first NTC temperature sensor is fixed in the air outlet duct of the frequency conversion heating circuit and collects the air outlet temperature signal, and the second NTC temperature sensor is fixed on the surface of the heating element and collects the heating element temperature signal. The main control chip compares the two temperature signals. When the difference between the two temperature signals is greater than the set difference threshold, or when either temperature signal is greater than the set temperature threshold, the main control chip outputs a power-off signal to cut off the heating power supply circuit.

[0020] As a further improvement to the above solution, the wiring channel is set to run through the axial direction of the lifting column. The inner wall of the wiring channel is provided with axially extending isolation ribs, which divide the wiring channel into a high-voltage wiring cavity and a low-voltage wiring cavity. The power supply cable of the heating power supply circuit is laid in the high-voltage wiring cavity, and the signal cable of the temperature detection circuit and the heating on / off circuit is laid in the low-voltage wiring cavity. The electrical connection cable is a spiral telescopic cable, which expands and contracts synchronously with the lifting column.

[0021] As a further improvement to the above solution, the frequency conversion heating circuit, temperature detection circuit, heating on / off circuit, and expansion interface circuit are detachably electrically connected to the integrated main control circuit via connectors. The expansion interface circuit also includes an ambient light strip driving unit and a reserved expansion interface unit. The output end of the ambient light strip driving unit is connected to the ambient light strip embedded in the tabletop. The reserved expansion interface unit includes a power supply terminal and a communication terminal. The power supply terminal is connected to the power conversion unit via an independently controlled switching device. The main control chip reads the category signal of the external functional module accessed by the reserved expansion interface unit via the communication terminal and controls the switching device to conduct according to the power supply parameters corresponding to the category signal.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. By adopting a partitioned architecture with a static main control area recessed base and a functional area set with the platform, the main control core is fixed in the static base cavity, while only the functional load moves with the platform. This effectively reduces the load on the platform during lifting and lowering, reduces the operating load on the single-column support structure, and improves the stability of the lifting process. Furthermore, it avoids long-term impact from lifting vibrations on core components such as the main control chip, reducing the risk of component loosening, solder joint detachment, and other failures, significantly extending service life. At the same time, the clear functional partitioning also streamlines the overall wiring logic, reducing the difficulty of assembly and subsequent maintenance.

[0024] 2. By embedding all electrical connection wires within the internal wiring channel of the single-column lifting column, the wiring is completely concealed, aligning with the lightweight and minimalist design of the single-column heated coffee table. Simultaneously, the internal insulating ribs of the column divide the wiring channel into independent chambers for high-voltage and low-voltage circuits. This physical isolation fundamentally suppresses electromagnetic interference from high-voltage lines to low-voltage signals such as temperature sensors and human body sensors, ensuring signal acquisition accuracy and control stability. Furthermore, the spiral telescopic cable design, which extends and retracts synchronously with the lifting stroke, prevents insulation damage and core breakage caused by repeated pulling and bending, enhancing the long-term reliability and electrical safety of the wiring chain.

[0025] 3. An independent hardware travel limit unit is added to the lifting drive circuit, with the upper and lower limit switches directly connected in series in the corresponding lifting power supply branch. The limit action is completely independent of the main control software and position sensor. When the platform reaches its limit travel, the limit switch directly and physically cuts off the power supply circuit. Even in extreme conditions such as main control program abnormalities or position sensor failures, the lifting travel can still be reliably constrained, eliminating mechanical failures such as platform overshooting or falling to the bottom from a hardware perspective, and significantly improving the safety redundancy and operational reliability of the lifting mechanism.

[0026] 4. The heating circuit is equipped with three levels of hardware protection: overheating, short circuit, and leakage current. Combined with dual NTC temperature sensor redundancy detection and human body induction interlock control, a multi-dimensional safety protection system is constructed to comprehensively cover various abnormal operating conditions and improve product safety. At the same time, a standardized expansion interface with automatic recognition function is reserved, allowing for plug-and-play adaptation to various external functional modules without modifying the original electrical control architecture, facilitating differentiated product configurations and future functional upgrades. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall assembly structure of the electronic control system of the present invention;

[0028] Figure 2 This is a schematic diagram of the three-level protection circuit of the variable frequency heating circuit of the present invention;

[0029] Figure 3 This is a schematic diagram illustrating the connection principle of the temperature detection circuit of the present invention;

[0030] Figure 4 This is a schematic diagram illustrating the control principle of the heating on / off circuit of the present invention;

[0031] Figure 5 This is a schematic diagram of the overall power supply architecture of the electronic control system of the present invention;

[0032] Figure 6 This is a schematic diagram of the protection circuit of the variable frequency heating circuit of the present invention;

[0033] Figure 7 This is a schematic diagram of the detection and control logic of the dual temperature sensors of the present invention;

[0034] Figure 8 This is a schematic diagram of the cross-sectional structure and wiring layout of the lifting column wiring channel of the present invention;

[0035] Figure 9 This is a schematic diagram of the connection architecture of the extended interface circuit of the present invention.

[0036] In the picture: 100, base;

[0037] 200. Single-column lifting column; 201. Cable routing channel; 202. Isolation rib; 203. High-voltage cable routing cavity; 204. Low-voltage cable routing cavity;

[0038] 300. Countertop;

[0039] 400. Static main control area; 410. Integrated main control circuit; 411. Main control chip; 412. Power conversion unit; 4121. Conversion module; 4122. Voltage regulator module;

[0040] 500. Follow-up functional area; 510. Variable frequency heating circuit; 511. Heating element; 5111. First heating core; 5112. Second heating core; 512. Variable frequency drive unit; 5121. Pulse width modulation drive branch; 513. Overheat protection device; 514. Short circuit protection device; 515. Leakage protection device; 520. Temperature detection circuit; 521. First NTC temperature sensor; 522. Second NTC temperature sensor; 530. Heating on / off circuit; 531. Human body sensing unit; 532. Interlocking switch unit; 540. Expansion interface circuit; 541. Interaction unit; 542. Ambient light strip drive unit; 543. Ambient light strip; 544. Reserved expansion interface unit; 545. Switching device;

[0041] 600. Concealed wiring links; 610. Electrical connection wires;

[0042] 700. Lifting drive circuit; 710. Electric push rod; 720. Electric push rod drive unit; 730. Hardware travel limit unit; 731. Upper limit switch; 732. Lower limit switch. Detailed Implementation

[0043] To enable those skilled in the art to better understand the technical solution, the present invention will be described in detail below with reference to embodiments. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of the present invention in any way.

[0044] Example 1

[0045] This embodiment is a preferred implementation of the present invention, which is adapted to a standard-sized single-column synchronous lifting and heating coffee table, and has complete variable frequency temperature control, multiple safety protections and functional expansion capabilities.

[0046] I. Overall System Architecture Figure 1 As shown, the lightweight heating coffee table adapted in this embodiment includes a base 100, a single-column lifting column 200 fixed in the center on the base 100, and a tabletop 300 supported by the lifting column. The whole adopts a lightweight structure with a single column in the center, which is visually simple and occupies little space.

[0047] The supporting intelligent safety electronic control system adopts the layout design of "static and dynamic zoning, hidden wiring", which is mainly composed of four parts: a static main control area 400, a follow-up functional area 500, a hidden wiring link 600 and a lifting drive circuit 700. The static main control area 400, as the control and power supply core of the system, is fixedly installed in the cavity inside the base 100 and does not lift along with the table top 300; the follow-up functional area 500 integrates all functional loads matching the table top 300, is fixed on the lower side of the table top 300, and lifts synchronously with the table top 300; the hidden wiring link 600 is built inside the single-column lifting column 200 to realize the electrical connection between the static main control area 400 and the follow-up functional area 500; the lifting drive circuit 700 provides power and limit protection for the lifting of the table top 300, and the main body is integrated inside the single-column lifting column 200.

[0048] 2. Structure Combination of the Static Main Control Area Figure 1 , Figure 2 and Figure 5 shown in the figures, the static main control area 400 includes an integrated main control circuit 410, which is recessed and installed in the closed cavity inside the base 100, so as to reduce external force collision and water vapor erosion, and improve the service life and operation stability of the main control components.

[0049] The integrated main control circuit 410 includes a main control chip 411 and a power conversion unit 412. The main control chip 411, as the control core of the system, is responsible for signal acquisition, logic operation and control instruction output, and can realize full-process logic management such as temperature regulation, lifting control, safety protection and function expansion.

[0050] The input end of the power conversion unit 412 is connected to the mains power, which is used to convert the mains power into working voltages of different levels to supply power to each component of the system in a graded manner. Specifically, the power conversion unit 412 includes an AC-DC conversion module 4121 and a voltage stabilization module 4122: the AC-DC conversion module 4121 converts the AC mains power into a 24V first DC voltage, and supplies power to power loads such as the electric push rod drive unit 720 through a power output branch; the voltage stabilization module 4122 further steps down the first DC voltage into a 5V second DC voltage, and supplies power to low-voltage weak current components such as the main control chip 411, the temperature detection circuit 520 and the human body induction unit 531 through a low-voltage output branch. The heating power supply circuit adopts the method of direct mains power supply without stepping down through the power conversion unit 412, which ensures sufficient heating power and reduces power conversion loss at the same time.

[0051] III. Structure of the Follow-up Functional Area 500 The follow-up functional area 500 integrates all heating, detection, and interactive functional components, all fixed to the underside of the platform 300 and rising and falling synchronously with the platform 300, reducing relative displacement of components during the lifting process and lowering the risk of cable pulling. The follow-up functional area 500 includes a frequency conversion heating circuit 510, a temperature detection circuit 520, a heating on / off circuit 530, and an expansion interface circuit 540. Each circuit is detachably electrically connected to the integrated main control circuit 410 via connectors, facilitating assembly and subsequent maintenance.

[0052] 1. Variable frequency heating circuit 510 combined Figure 5 , Figure 6 As shown, the variable frequency heating circuit 510 is used to realize the heating function, and mainly includes a heating element 511, a variable frequency drive unit 512, and three-level hardware protection devices.

[0053] The heating element 511 includes a first heating core 5111 and a second heating core 5112 connected in parallel to the heating power supply circuit. The dual heating core design can realize multiple power levels to adapt to the power requirements of different heating scenarios. The frequency conversion drive unit 512 is connected to the main control chip 411. It contains two pulse width modulation drive branches 5121, which respectively control the on / off duty cycle of the first heating core 5111 and the second heating core 5112. Frequency conversion heating is achieved through pulse width modulation, which can accurately control the output power and heating temperature.

[0054] The heating power supply circuit is connected in series with an overheat protection device 513, a short circuit protection device 514, and a leakage current protection device 515, forming a three-level independent hardware safety protection:

[0055] The overheat protection device 513 adopts a normally closed temperature control switch with an action threshold set at 85°C. It is attached to the heat dissipation surface of the first heating core 5111. When the surface temperature of the heating core exceeds the safety threshold, the temperature control switch automatically disconnects and cuts off the total power supply to the heating circuit.

[0056] The short-circuit protection device 514 uses a fuse with a rated current of 10A, which is connected in series in the main heating circuit. When a short-circuit fault occurs in the circuit and the current exceeds the rated value, the fuse blows, permanently cutting off the circuit and preventing the fault from spreading and causing the risk of fire.

[0057] The leakage current protection device 515 is a residual current operated device with a leakage current setting of 30mA. It monitors the current difference between the live wire and the neutral wire in real time. When the leakage current exceeds the safety threshold, it quickly cuts off the power supply within milliseconds to prevent the risk of electric shock. When any of the above protective devices activates, the power supply to the first heating element 5111 and the second heating element 5112 will be cut off simultaneously, achieving full circuit power-off protection. Moreover, the protection action is independent of the software control of the main control chip 411, resulting in higher reliability.

[0058] 2. Temperature detection circuit 520 combined Figure 3 , Figure 7 As shown, the temperature detection circuit 520 is used to realize real-time monitoring of heating temperature and software-level overheat protection. It adopts a dual-sensor redundancy design, including a first NTC temperature sensor 521 and a second NTC temperature sensor 522.

[0059] The first NTC temperature sensor 521 is fixed inside the air outlet duct of the variable frequency heating circuit 510 to collect the outlet air temperature signal, reflecting the actual output heating temperature. The second NTC temperature sensor 522 is fixed on the surface of the heating element 511 to collect the core temperature signal of the heating element 511, directly reflecting the working status of the heating component. The signal lines of the two sensors are respectively connected to the two independent ADC sampling ports of the main control chip 411, without interference between them.

[0060] The main control chip 411 receives two temperature signals in real time and performs comparison calculations: when the difference between the two temperature signals is greater than the set difference threshold (set to 15℃ in this embodiment), it is determined that the sensor is faulty or the air duct is blocked, and a power-off signal is immediately output to cut off the heating power supply circuit; when either temperature signal is greater than the set temperature threshold (set to 80℃ in this embodiment), it is determined to be in an overheating state, and a power-off signal is also output to cut off the heating circuit, realizing software-level overheat protection, forming a dual protection mechanism with hardware overheat protection, and further improving safety redundancy.

[0061] 3. Heating on / off circuit 530 combined Figure 4 As shown, the heating on / off circuit 530 is used to realize human presence detection and heating interlock control, reducing safety hazards from the perspective of usage scenarios. It includes a human body sensing unit 531 and an interlock switch unit 532.

[0062] The interlocking switch unit 532 uses an AC relay, which is connected in series in the main path of the heating power supply circuit and can directly control the on / off of the heating circuit; the human body sensing unit 531 uses an infrared human body sensing module with a sensing distance set to 0.8m, which is installed on the lower edge of the tabletop 300. Its output is connected to the input port of the main control chip 411 to detect whether there is a human body in the set range around the coffee table.

[0063] During operation, the main control chip 411 controls the state of the interlocking switch unit 532 based on the human presence signal output by the human body sensing unit 531: when a human body is detected, the interlocking switch unit 532 is turned on, and the heating circuit is ready to work; when no one is detected for more than a set time (set to 15 minutes in this embodiment), the interlocking switch unit 532 is turned off, forcibly cutting off the heating power supply to avoid safety hazards and energy waste caused by continuous heating in an unattended state.

[0064] 4. Expansion interface circuit 540 combined Figure 9 As shown, the expansion interface circuit 540 is used to realize human-computer interaction and function expansion, and improve product adaptability. It includes an interaction unit 541, an ambient light strip driving unit 542, and a reserved expansion interface unit 544.

[0065] The interaction unit 541 uses a touch button module, which is fixed to the side of the tabletop 300, allowing users to perform operations such as temperature adjustment, lifting control, and mode switching. Its signal terminal is connected to the main control chip 411 to realize command input and status display.

[0066] The output of the ambient light strip driver unit 542 is connected to the ambient light strip 543 embedded in the edge of the tabletop 300. It can receive instructions from the main control chip 411 to control the switch, brightness and color mode of the light strip, thereby enhancing the home atmosphere and product aesthetics.

[0067] The reserved expansion interface unit 544 includes power supply terminals and communication terminals. The power supply terminals are connected to the power conversion unit 412 via an independently controlled switching device 545, and the communication terminals are connected to the main control chip 411. When an external functional module is connected to the reserved expansion interface unit 544, the main control chip 411 reads the module's category signal via the communication terminals, automatically identifies the module type and power supply requirements, and controls the switching device 545 to turn on according to the corresponding parameters to supply power to the external module, realizing plug-and-play functional expansion without modifying the original electrical control architecture.

[0068] IV. Concealed wiring link 600 combination Figure 1 , Figure 8 As shown, the concealed wiring link 600 is used to realize the electrical connection between the static main control area 400 and the follow-up function area 500. All of them are built into the single column lifting column 200, realizing complete concealment of wiring and improving the overall aesthetics of the machine.

[0069] The single-column lifting column 200 has an axially continuous cable routing channel 201 inside. The inner wall of the cable routing channel 201 is integrally formed with an axially extending isolation rib 202, which divides the cable routing channel 201 into two independent high-voltage cable routing cavities 203 and low-voltage cable routing cavities 204. The high-voltage power supply cable of the heating power supply circuit is laid in the high-voltage cable routing cavity 203, while the low-voltage signal cables of the temperature detection circuit 520 and the heating on / off circuit 530 are laid in the low-voltage cable routing cavity 204. The physical structure isolates and suppresses electromagnetic interference from high voltage to low-voltage signals, ensuring the stability of signal transmission.

[0070] The electrical connection cable 610 is a spiral telescopic cable, which runs inside the cable routing channel 201. Its first end is electrically connected to the integrated main control circuit 410 in the base 100, and its second end is electrically connected to the circuits in the follow-up functional area 500 on the underside of the platform 300. The spiral telescopic cable can extend and retract synchronously with the lifting column's lifting movement, always maintaining a suitable tension to avoid cable tangling, pulling, or jamming during lifting, while also adapting to the stroke requirements of single-column lifting.

[0071] V. Lifting drive circuit 700 combination Figure 1 , Figure 5 As shown, the lifting drive circuit 700 is used to drive the platform 300 to achieve smooth and synchronous lifting, and provides hardware-level travel limit protection, including an electric push rod 710, an electric push rod drive unit 720, and a hardware travel limit unit 730.

[0072] The electric push rod 710 is vertically installed in the internal cavity of the single-column lifting column 200. Its fixed end is connected to the base 100, and its output end is connected to the lower side of the platform 300. The extension and retraction of the push rod drives the platform 300 to rise and fall smoothly along the column axis, so as to achieve the effect of synchronous lifting of a single column.

[0073] The electric push rod drive unit 720 receives the lifting command from the main control chip 411, controls the extension and retraction direction of the electric push rod 710 by switching the polarity of the power supply, and realizes start and stop by controlling the power supply, thereby completing the lifting, lowering and stopping control of the table 300.

[0074] The hardware travel limit unit 730 is a physical limit mechanism independent of software control, including an upper limit switch 731 and a lower limit switch 732. The upper limit switch 731 is connected in series in the rising power supply branch of the electric push rod drive unit 720, and the lower limit switch 732 is connected in series in the falling power supply branch. When the platform 300 rises to the highest position, the platform 300 or the push rod triggers the upper limit switch 731 to open, directly cutting off the rising power supply circuit, so that it cannot continue to rise even if the software control fails; when the platform 300 falls to the lowest position, it triggers the lower limit switch 732 to open, cutting off the falling power supply circuit, realizing hardware-level anti-overshoot and anti-fall protection, and improving the reliability of the lifting mechanism.

[0075] VI. System Working Principle The overall workflow of the electronic control system in this embodiment is as follows:

[0076] 1. Power-on initialization: After the mains power is connected, the power conversion unit 412 outputs the working voltages of each stage, the main control chip 411 completes the system initialization, and detects the connection status of each sensor, protection device and functional module. If the status is normal, it enters the standby mode.

[0077] 2. Lifting control process: The user sends a lifting command through the interaction unit 541. The main control chip 411 outputs the corresponding control signal to the electric push rod drive unit 720. The electric push rod 710 drives the table 300 to lift smoothly. During the lifting process, the hardware travel limit unit 730 monitors the travel position in real time. When the limit position is reached, the corresponding power supply circuit is physically cut off to forcibly stop the lifting action.

[0078] 3. Heating control process: After the user turns on the heating function, the main control chip 411 first detects the presence of a human body through the human body sensing unit 531. After confirming that someone is present, it controls the interlocking switch unit 532 to close, and the heating circuit enters the standby state. The main control chip 411 adjusts the heating power through the frequency conversion drive unit 512 according to the user-set temperature and the real-time sampling values ​​of the two NTC sensors to achieve constant temperature heating control.

[0079] 4. Safety protection mechanism: During operation, if overheating, short circuit, or leakage occurs, the corresponding hardware protection device will directly cut off the heating circuit; if the temperature sampling is abnormal or the temperature exceeds the threshold, the main control chip 411 will output a software power-off signal; if no one is in place for a timeout, the heating interlock will be automatically disconnected; during the lifting process, the hardware limit switch will take effect independently, and multiple mechanisms will work together to ensure safe use.

[0080] 5. Function Expansion Process: After an external functional module is connected to the reserved expansion interface, the main control chip 411 automatically identifies the module type and matches the power supply parameters through the communication terminal, and controls the switching device 545 to turn on the power supply, so as to realize the plug-and-play expansion of functions.

[0081] Example 2

[0082] This embodiment is a simplified implementation, adapted to small-sized, lightweight single-column lift-up heating coffee table. While retaining core safety functions, it simplifies components, reducing overall cost and control complexity.

[0083] The difference between this embodiment and Embodiment 1 is that:

[0084] 1. Variable frequency heating circuit 510: The heating element 511 adopts a single heating core structure. Correspondingly, the variable frequency drive unit 512 is only set with one pulse width modulation drive branch 5121 to realize single-channel power regulation. The overheat protection device 513 is mounted on the heat dissipation surface of the single heating core. The short circuit protection device 514 and the leakage protection device 515 are still connected in series in the main heating power supply circuit, and the three-level hardware protection mechanism is fully retained.

[0085] 2. Temperature detection circuit 520: Only one NTC temperature sensor is retained, which is fixed on the surface of the heating element 511 to collect the core temperature signal and connect to the single-channel ADC sampling port of the main control chip 411; the main control chip 411 realizes overheat protection and constant temperature control based on the single-channel temperature signal, simplifies the sampling logic, and adapts to the control requirements of small products.

[0086] In this embodiment, the circuit architecture of the static main control area 400, the strong and weak current separation structure of the hidden wiring link 600, the hardware travel limit unit 730 of the lifting drive circuit 700, the human body induction interlock structure of the heating on / off circuit 530, and the basic configuration of the expansion interface circuit 540 are all consistent with the corresponding structures described in Embodiment 1, and will not be repeated in this embodiment.

[0087] Example 3

[0088] This embodiment is a functional expansion implementation. Based on the core electronic control architecture of Embodiment 1, it focuses on the plug-and-play expansion capability of the reserved expansion interface unit 544 to adapt to diverse personalized functional upgrade needs.

[0089] The overall system architecture, static main control area 400 structure, frequency conversion heating circuit 510, temperature detection circuit 520, heating on / off circuit 530, hidden wiring link 600, and lifting drive circuit 700 of this embodiment are completely consistent with those of Embodiment 1, and will not be repeated here; the difference between this embodiment and Embodiment 1 is that the specific application scenarios and corresponding control logic of the reserved expansion interface unit 544 are different.

[0090] The communication terminals of the reserved expansion interface unit 544 adopt the I2C communication protocol, and the power supply terminals support 5V and 12V voltage outputs. The switching device 545 uses a controllable MOSFET, and its on / off state and output voltage level are independently controlled by the main control chip 411. When an external functional module is connected to the reserved expansion interface unit 544, the module's built-in identification chip sends a category signal to the main control chip 411 through the communication terminals. The main control chip 411 parses the signal and matches the corresponding power supply parameters.

[0091] 1. When connected to the desktop wireless charging module, the power supply parameters corresponding to the category signal are 12V / 2A. The main control chip 411 controls the switching device 545 to conduct the 12V power supply branch to power the wireless charging module. At the same time, the working status of the charging module can be displayed through the interactive unit 541.

[0092] 2. When the Bluetooth audio module is connected, the power supply parameters corresponding to the category signal are 5V / 1A. The main control chip 411 controls the switching device 545 to switch to 5V low-voltage power supply to match the working voltage requirements of the module.

[0093] 3. When the type signal of the access module cannot be identified, or the power supply parameters exceed the rated range of the interface, the main control chip 411 controls the switching device 545 to remain in the off state to avoid damage to the external module or the main control system, thereby achieving access fault protection.

[0094] This embodiment achieves flexible functional upgrades by using standardized expansion interfaces and automatic identification mechanisms, without modifying the original electronic control system hardware and core programs, thus adapting to the differentiated usage needs of different users.

[0095] It should be noted that, in this document, the terms "comprising," "including," and any other variations are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Specific examples have been used in this document to illustrate the principles and implementation methods of the present invention. These examples are merely for the purpose of helping to understand the method and core ideas of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that, due to the limitations of written expression and the objective existence of infinite specific structures, those skilled in the art can make several improvements, modifications, or variations without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, variations, or combinations, or the direct application of the concept and technical solution of the present invention to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. An intelligent safety electronic control system adapted to a single-column synchronous lifting and heating coffee table, the lightweight heating coffee table comprising a base (100), a single-column lifting column (200) centrally fixed on the base (100), and a tabletop (300) supported by the lifting column, characterized in that, The electrical control system includes a static main control area (400), a follow-up function area (500), and a concealed wiring link (600): The static main control area (400) includes an integrated main control circuit (410). The integrated main control circuit (410) is recessed and installed in the cavity inside the base (100). The integrated main control circuit (410) includes a main control chip (411) and a power conversion unit (412). The input terminal of the power conversion unit (412) is connected to the mains power, the power output branch of the power conversion unit (412) is connected to the power load, and the low voltage output branch of the power conversion unit (412) is connected to the main control chip (411). The follow-up functional area (500) includes a frequency conversion heating circuit (510), a temperature detection circuit (520), a heating on / off circuit (530), and an expansion interface circuit (540). The heating element (511) of the frequency conversion heating circuit (510), the human body sensing unit (531) of the temperature detection circuit (520) heating on / off circuit (530), and the interaction unit (541) of the expansion interface circuit (540) are all fixed to the lower side of the table (300) and rise and fall synchronously with the table (300). The concealed wiring link (600) includes an electrical connection wire (610) that runs through the wiring channel (201) inside the lifting column. The first end of the electrical connection wire (610) is electrically connected to the integrated main control circuit (410), and the second end of the electrical connection wire (610) is electrically connected to each circuit of the follow-up functional area (500). The electrical control system also includes a lifting drive circuit (700), which includes an electric push rod (710), an electric push rod drive unit (720), and a hardware travel limit unit (730). The electric push rod (710) is installed inside the single-column lifting column (200), and the output end of the electric push rod (710) is connected to the platform (300). The hardware travel limit unit (730) includes an upper limit switch (731) connected in series in the upward power supply branch of the electric push rod (710) drive unit and a lower limit switch (732) connected in series in the downward power supply branch of the electric push rod (710) drive unit.

2. The intelligent safety electronic control system for a single-column synchronous lifting and heating coffee table according to claim 1, characterized in that, The heating power supply circuit of the frequency conversion heating circuit (510) is connected in series with an overheat protection device (513), a short circuit protection device (514) and a leakage current protection device (515).

3. The intelligent safety electronic control system for a single-column synchronous lifting and heating coffee table according to claim 1, characterized in that, The temperature detection circuit (520) includes a first NTC temperature sensor (521) and a second NTC temperature sensor (522). The signal lines of the first NTC temperature sensor (521) and the second NTC temperature sensor (522) are respectively connected to the two sampling ports of the main control chip (411).

4. The intelligent safety electronic control system for a single-column synchronous lifting and heating coffee table according to claim 1, characterized in that, The heating on / off circuit (530) includes a human body sensing unit (531) and an interlocking switch unit (532). The interlocking switch unit (532) is connected in series in the heating power supply circuit. The output terminal of the human body sensing unit (531) is connected to the input port of the main control chip (411). The main control chip (411) controls the on / off of the interlocking switch unit (532) based on the human body presence signal output by the human body sensing unit (531).

5. The intelligent safety electronic control system for a single-column synchronous lifting and heating coffee table according to claim 1, characterized in that, The power conversion unit (412) includes an AC-DC conversion module (4121) and a voltage regulator module (4122). The AC-DC conversion module (4121) converts the mains power into a first DC voltage and supplies power to the electric push rod drive unit (720) through the power output branch. The voltage regulator module (4122) reduces the first DC voltage to a second DC voltage and supplies power to the main control chip (411), temperature detection circuit (520) and human body sensing unit (531) through the low voltage output branch. The heating power supply circuit is directly powered by the mains power. The overheat protection device (513), short circuit protection device (514) and leakage protection device (515) are connected in series on the power supply path between the mains power and the heating element (511).

6. The intelligent safety electronic control system for a single-column synchronous lifting and heating coffee table according to claim 1, characterized in that, The heating element (511) includes a first heating core (5111) and a second heating core (5112) connected in parallel to the heating power supply circuit. The frequency conversion heating circuit (510) also includes a frequency conversion drive unit (512) connected to the main control chip (411). The frequency conversion drive unit (512) includes two pulse width modulation drive branches (5121) that control the power of the first heating core (5111) and the second heating core (5112) respectively. The overheat protection device (513) is a normally closed temperature control switch, which is mounted on the heat dissipation surface of the first heating core (5111). The short circuit protection device (514) is a fuse. The leakage protection device (515) is a residual current operated protector. When any one of the overheat protection device (513), the short circuit protection device (514), and the leakage protection device (515) operates, the power supply to the first heating core (5111) and the second heating core (5112) is cut off simultaneously.

7. The intelligent safety electronic control system for a single-column synchronous lifting and heating coffee table according to claim 1, characterized in that, The first NTC temperature sensor (521) is fixed in the air outlet duct of the frequency conversion heating circuit (510) and collects the air outlet temperature signal. The second NTC temperature sensor (522) is fixed on the surface of the heating element (511) and collects the temperature signal of the heating element (511). The main control chip (411) compares the two temperature signals. When the difference between the two temperature signals is greater than the set difference threshold, or when either temperature signal is greater than the set temperature threshold, the main control chip (411) outputs a power-off signal to cut off the heating power supply circuit.

8. The intelligent safety electronic control system for a single-column synchronous lifting and heating coffee table according to claim 1, characterized in that, The wiring channel (201) is installed along the axial direction of the lifting column. The inner wall of the wiring channel (201) is provided with an axially extending isolation rib (202). The isolation rib (202) divides the wiring channel (201) into a high-voltage wiring cavity (203) and a low-voltage wiring cavity (204). The power supply cable of the heating power supply circuit is laid in the high-voltage wiring cavity (203), and the signal cable of the temperature detection circuit (520) and the heating on / off circuit (530) is laid in the low-voltage wiring cavity (204). The electrical connection line (610) is a spiral telescopic cable, which expands and contracts synchronously with the lifting column.

9. The intelligent safety electronic control system for a single-column synchronous lifting and heating coffee table according to claim 1, characterized in that, The frequency conversion heating circuit (510), temperature detection circuit (520), heating on / off circuit (530) and expansion interface circuit (540) are detachably electrically connected to the integrated main control circuit (410) via connectors. The expansion interface circuit (540) also includes an ambient light strip driving unit (542) and a reserved expansion interface unit (544). The output end of the ambient light strip driving unit (542) is connected to the ambient light strip (543) embedded in the tabletop (300). The reserved expansion interface unit (544) includes a power supply terminal and a communication terminal. The power supply terminal is connected to the power conversion unit (412) via an independently controlled switching device (545). The main control chip (411) reads the category signal of the external functional module accessed by the reserved expansion interface unit (544) via the communication terminal and controls the switching device (545) to conduct according to the power supply parameters corresponding to the category signal.

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