Ground segmentation method and device for all-metal frame intelligent panel and intelligent panel

Abstract

The invention discloses a ground segmentation method and device for an all-metal frame intelligent panel and the intelligent panel, and relates to the technical field of intelligent home panels. The intelligent panel simultaneously comprises isolation of the following three paths: internal power supply isolation: removing a Y capacitor in a flyback switching power supply of the intelligent panel, and simultaneously adopting a sandwich winding method for a transformer; external power supply isolation: adopting a power supply isolation module to electrically isolate a power supply of external equipment; and external signal isolation: carrying out physical isolation on signals of external equipment by adopting an optical coupler isolation module. According to the all-metal frame intelligent panel ground segmentation method and device and the intelligent panel provided by the invention, internal circuit optimization and external equipment isolation dual-path cooperative solution is realized, a power supply module and a signal transmission line are subjected to dual isolation design, a current conduction path from an internal circuit and an external environment to a metal surface is blocked, and a current conduction path from the internal circuit to the metal surface is blocked; and the experience feeling of the user when using the smart home is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of smart home panels, and in particular to a method and device for segmenting a full-metal frame smart panel, and the smart panel. Background Art

[0002] With the booming smart home industry, products are not only pursuing intelligent functionality but also emphasizing the integration of design and technological aesthetics. To create a futuristic visual effect, metal materials are widely used in smart home housings. Through processes such as brushing and spraying, diverse customization requirements can be achieved.

[0003] However, users frequently report a "damping," "microvibration," or "numbness" sensation when sliding their fingers across metal surfaces. While the leakage current of these products has been rigorously tested and is well below the national certification limit of 250μA, posing no safety risk, these unusual sensations still impact the user experience, making them an industry pain point that urgently needs to be addressed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a ground segmentation method, device and smart panel for an all-metal frame smart panel. Through the dual isolation technology of power supply and signal, the ground is effectively segmented, the current conduction path from the internal circuit and the external environment to the metal surface is blocked, and the user experience when using the smart home is effectively improved.

[0005] In a first aspect, the present invention provides a method for segmenting a full metal frame smart panel, which includes isolating the following three paths:

[0006] Internal power supply isolation: The Y capacitor in the flyback switching power supply of the smart panel is removed, and the transformer adopts a sandwich winding method;

[0007] External power supply isolation: Use power isolation module to electrically isolate the power supply of external devices;

[0008] External signal isolation: Optocoupler isolation module is used to physically isolate the signals of external devices.

[0009] Furthermore, the external signal isolation also includes at least one AND gate, and maintains the same output level as the smart panel; when the smart panel outputs a signal to an external device, the AND gate is set between the optocoupler isolation module and the external device, and when the smart panel receives an input signal from the external device, the AND gate is set between the optocoupler isolation module and the smart panel; the AND gate and the optocoupler isolation module work together to prevent the IO level from fluctuating with load changes.

[0010] Furthermore, in the external signal isolation, the rate of the optocoupler isolation module matches the signal rate of the external device.

[0011] Furthermore, the internal power isolation further includes: designing corresponding air gap parameters according to the product type of the smart panel.

[0012] In a second aspect, the present invention provides a device for segmenting a full metal frame smart panel, comprising:

[0013] Flyback switching power supply, remove the Y capacitor, and use a sandwich winding method for the transformer, which is connected to the power input terminal of the smart panel;

[0014] The power isolation module is connected to the power supply end of the smart panel and external devices respectively;

[0015] The optocoupler isolation module is connected to the control terminal of the smart panel and the external device respectively.

[0016] Furthermore, it also includes at least one AND gate, and maintains the same output level as the smart panel; when the smart panel outputs a signal to an external device, the AND gate is set between the optocoupler isolation module and the external device, and when the smart panel receives an input signal from the external device, the AND gate is set between the optocoupler isolation module and the smart panel.

[0017] Furthermore, the second terminal of the optocoupler isolation module is the first input / output signal terminal, the fourth terminal is connected to the A terminal of the AND gate; and the Y terminal of the AND gate is the second input / output signal terminal.

[0018] Furthermore, the rate of the optical coupling isolation module matches the signal rate of the external device.

[0019] In a third aspect, the present invention provides a full metal frame smart panel, comprising a full metal frame smart panel body and the device as described in the second aspect.

[0020] The technical solutions provided in the embodiments of the present invention have at least the following technical effects:

[0021] The dual-path solution of internal circuit optimization and external device isolation is achieved through double isolation design of the power module and signal transmission line, accurately cutting off the leakage circuit. While ensuring that the product complies with safety standards, it significantly improves the smoothness and comfort of user interaction and effectively optimizes the product usage experience.

[0022] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are specifically listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This is a schematic diagram of a method 1.0 for segmenting a full metal frame smart panel according to the present invention;

[0025] Figure 2 This is a schematic diagram of the segmentation method 2.0 of the all-metal frame smart panel of the present invention;

[0026] Figure 3 This is a schematic diagram of the final mode of the method for segmenting the all-metal frame smart panel of the present invention;

[0027] Figure 4 Schematic diagram of the method in Example 1 of the present invention;

[0028] Figure 5 This is a structural block diagram of the output signal of the optocoupler and gate in the first embodiment of the present invention;

[0029] Figure 6 This is a structural block diagram of the input signal of the optocoupler and gate in the first embodiment of the present invention;

[0030] Figure 7 Schematic diagram of the structure of the optocoupler and gate circuit in the second embodiment of the present invention. DETAILED DESCRIPTION

[0031] The embodiments of the present invention provide a ground segmentation method, device, and smart panel for an all-metal frame smart panel. By using power and signal dual isolation technology, the ground is effectively segmented, blocking the current conduction path from the internal circuit and the external environment to the metal surface, effectively improving the user experience when using a smart home.

[0032] In the process of solving this technical problem, the inventor tried several solutions and made continuous improvements.

[0033] In Solution 1.0, in order to solve the problem of numbness on metal surfaces, the power supply was optimized, the Y capacitor was removed, and the power transformer was adjusted. However, the inventors found that this solution may still cause the numbness on metal surfaces. After repeated analysis, it was found that the problem was caused by the fact that peripherals such as LED light drivers in the smart home system also use alternating current (AC) for power supply, and there is a risk of leakage current conduction due to the common ground loop. Figure 1 shown.

[0034] In order to improve the problems of solution 1.0, the inventor designed solution 2.0, which designed the metal surface to be disconnected from the smart panel. However, after repeated testing and verification, it was found that for peripherals with large leakage current, there would still be a slight "numb feeling problem" when transmitting through spatial inductive coupling, such as Figure 2At the same time, the lack of connection between the metal surface and the smart panel will also lead to reduced reliability performance such as ESD, which needs to be solved by increasing the anti-interference performance level of the relevant IC itself, greatly increasing the product development cost.

[0035] For the electrical safety design of the all-metal frame smart panel, in order to effectively eliminate the problem of abnormal touch of the metal shell, the final model is designed to solve the problem by optimizing the internal circuit and isolating the external device. Figure 3 As shown:

[0036] Internal path optimization: For common two-phase power supply systems and flyback switching power supply solutions, potential leakage paths are cut off at the source by removing Y capacitors. At the same time, refined transformer design, using sandwich winding and optimizing air gap parameters, effectively reduces the coupling capacitance and leakage inductance between windings, thereby reducing the generation of internal leakage current and ensuring pure and stable output of the power module.

[0037] External path isolation: Considering that peripherals such as LED light drivers in smart home systems are also powered by alternating current (AC), and there is a risk of leakage current conduction due to a common ground loop, a power isolation IC (transformer isolation technology) is used to electrically isolate the external power supply and cut off the current conduction path. At the same time, optocoupler devices are used to achieve physical isolation of signal transmission to prevent leakage current from peripherals from invading the smart home host through the signal link, eliminating leakage risks from external paths.

[0038] The coordinated application of dual-path technology solutions can not only meet safety standards, but also significantly enhance the user interaction experience, ensuring that metal-cased devices have a smooth and seamless touch.

[0039] Example 1

[0040] This embodiment provides a method for segmenting a full metal frame smart panel. Figure 4 As shown, it also includes the isolation of the following three paths:

[0041] Internal power supply isolation: Remove the Y capacitor from the flyback switching power supply of the smart panel to cut off potential leakage channels at the source. At the same time, use a sandwich winding method for the transformer. Preferably, design the corresponding air gap parameters according to the product type of the smart panel to effectively reduce the coupling capacitance and leakage inductance between the windings, thereby reducing the generation of internal leakage current and ensuring the pure and stable output of the power module.

[0042] External power supply isolation: A power isolation module is used to electrically isolate the power supply of external devices, cutting off the current conduction path and avoiding the risk of leakage current conduction caused by a common ground loop with external devices.

[0043] External signal isolation: Optocoupler isolation modules are used to physically isolate signals from external devices, preventing leakage current from the peripheral device from invading the signal link and eliminating leakage risks from external paths. Ideally, the rate of the optocoupler isolation module matches the signal rate of the external device.

[0044] By isolating all three paths simultaneously, we can effectively eliminate the issue of abnormal tactile sensation in metal casings, meeting safety standards while significantly improving the user experience and ensuring a smooth and flawless touch for metal-cased devices. This also doesn't affect ESD reliability, keeping hardware costs manageable.

[0045] In a preferred implementation, in order to ensure that the output signal level does not change with the load, a unique combination of optocoupler + AND gate is designed to solve the external load capacity problem. The external signal isolation also includes at least one AND gate, and maintains the same output level as the smart panel (the output of the smart panel and the AND gate can be controlled simultaneously by the signal). When the smart panel outputs a signal to an external device, the AND gate is set between the optocoupler isolation module and the external device, such as Figure 5 When the smart panel receives an input signal from an external device, the AND gate is set between the optocoupler isolation module and the smart panel, as shown in FIG. Figure 6 As shown. Through the synergistic effect of the AND gate and the optocoupler isolation module, the IO level is not easily fluctuated with the load change, solving the problem of external load capacity. Usually, the transmission between the smart panel and the peripheral is one-way: if the smart panel wants to control the peripheral, the smart panel outputs the signal to the external device, using Figure 5 If the smart panel needs to collect the signal of the peripheral device, it should use Figure 6 If bidirectional signal transmission is required in special cases, it can be achieved through two AND gates.

[0046] Based on the same inventive concept, this application also provides a device corresponding to the method in Example 1, see Example 2 for details.

[0047] Example 2

[0048] In this embodiment, a device for dividing a full metal frame smart panel is provided. Figure 3 Shown, including:

[0049] A flyback switching power supply removes the Y capacitor, and the transformer adopts a sandwich winding method and is connected to the power input terminal of the smart panel. Preferably, the corresponding air gap parameters are designed according to the product type of the smart panel.

[0050] The power isolation module is connected to the power supply end of the smart panel and external devices respectively;

[0051] The optical coupling isolation module is connected to the control terminal of the smart panel and the external device respectively. Preferably, the rate of the optical coupling isolation module matches the signal rate of the external device.

[0052] In a better implementation, in order to ensure that the output signal level does not change with the load, a unique combination of optocoupler + AND gate is designed to solve the external load capacity problem. When the smart panel outputs a signal to an external device, the AND gate is set between the optocoupler isolation module and the external device, such as Figure 5 When the smart panel receives an input signal from an external device, the AND gate is set between the optocoupler isolation module and the smart panel, as shown in FIG. Figure 6 As shown in the figure, the smart panel outputs a signal level of "0 or 1". After passing through the AND gate, the output signal level is "0 or 1". If it is used as an input, just invert the optocoupler + AND gate.

[0053] Figure 5 and Figure 6 The solutions can be implemented through Figure 7 The circuit implementation shown in the figure uses an optocoupler isolation module model EL3H7CTA-G and an AND gate model 74AHC1G08. The second terminal of the optocoupler isolation module serves as the first input / output signal terminal, and the fourth terminal is connected to the A terminal of the AND gate. The Y terminal of the AND gate serves as the second input / output signal terminal. When the smart panel outputs a signal to an external device, the second terminal of the optocoupler isolation module serves as the first output signal terminal, connected to the smart panel, while the Y terminal of the AND gate serves as the second output signal terminal, connected to the external device. When the smart panel receives an input signal from an external device, the second terminal of the optocoupler isolation module serves as the first input signal terminal, connected to the external device, and the Y terminal of the AND gate serves as the second input signal terminal, connected to the smart panel.

[0054] If the optocoupler isolation module is used alone for signal isolation, Figure 7 If the load at position "A" in the figure is very heavy, the output circuit of the optocoupler will resemble an NPN switching circuit, which, in turn, behaves like a current source, resulting in a relatively high output impedance. When the external load changes (such as changes in resistance or the switching of an inductive load), Ohm's law and the principle of voltage division cause the voltage between the collector and emitter to fluctuate significantly due to the load change. For example, when the load resistance decreases, the current increases, the voltage drop across the collector resistor increases, and the output level decreases; when the load resistance increases, the output level increases, potentially affecting level accuracy. Therefore, the inventors innovatively addressed this issue by introducing an AND gate circuit. The internal circuit of the AND gate IC resembles a push-pull output circuit, consisting of two complementary and symmetrical switching transistors (such as NPN and PNP transistors). This results in extremely low output impedance, similar to a voltage source. This low output impedance significantly reduces the circuit's sensitivity to load changes, ensuring that the output voltage (level) remains essentially constant even with load fluctuations (such as changes in resistance or current demand).

[0055] Example 3

[0056] This embodiment provides a full metal frame smart panel, including a full metal frame smart panel body and the device as described in the second embodiment.

[0057] This invention addresses this issue through a dual-path approach: internal circuit optimization and external device isolation. By implementing dual isolation between the power module and signal transmission lines, leakage current is precisely cut off. This significantly improves the smoothness and comfort of user interaction while ensuring product compliance with safety standards, effectively optimizing the user experience. The invention also incorporates a unique optocoupler and AND gate combination to ensure that the output signal level remains constant with load, thereby enhancing external load capacity.

[0058] Although the specific embodiments of the present invention are described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and are not intended to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for segmenting a full metal frame smart panel, characterized in that: The smart panel also includes isolation of the following three paths: Internal power supply isolation: The Y capacitor in the flyback switching power supply of the smart panel is removed, and the transformer adopts a sandwich winding method; External power supply isolation: Use power isolation module to electrically isolate the power supply of external devices; External signal isolation: Optocoupler isolation module is used to physically isolate the signals of external devices.

2. The method according to claim 1, wherein: The external signal isolation also includes at least one AND gate, and maintains the same output level as the smart panel; when the smart panel outputs a signal to an external device, the AND gate is set between the optocoupler isolation module and the external device; when the smart panel receives an input signal from the external device, the AND gate is set between the optocoupler isolation module and the smart panel; the AND gate and the optocoupler isolation module work together to prevent the IO level from fluctuating with load changes.

3. The method according to claim 1, wherein: In the external signal isolation, the rate of the optocoupler isolation module matches the signal rate of the external device.

4. The method according to claim 1, wherein: The internal power isolation further includes: designing corresponding air gap parameters according to the product type of the smart panel.

5. A device for dividing a full metal frame intelligent panel, characterized in that: include: Flyback switching power supply, remove the Y capacitor, and use a sandwich winding method for the transformer, which is connected to the power input terminal of the smart panel; The power isolation module is connected to the power supply end of the smart panel and external devices respectively; The optocoupler isolation module is connected to the control terminal of the smart panel and the external device respectively.

6. The device according to claim 5, characterized in that: It also includes at least one AND gate, and maintains the same output level as the smart panel; when the smart panel outputs a signal to an external device, the AND gate is set between the optocoupler isolation module and the external device, and when the smart panel receives an input signal from the external device, the AND gate is set between the optocoupler isolation module and the smart panel.

7. The device according to claim 6, characterized in that: The second terminal of the optical coupling isolation module is the first input / output signal terminal, the fourth terminal is connected to the A terminal of the AND gate; the Y terminal of the AND gate is the second input / output signal terminal.

8. The device according to claim 5, characterized in that: The rate of the optical coupling isolation module matches the signal rate of the external device.

9. A full metal frame smart panel, characterized in that: It comprises a full metal frame smart panel body and a device as described in any one of claims 5-8.

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