Human body induction identification circuit and device applied to rollator and rollator

Abstract

The utility model relates to the field of human body induction identification, and provides a human body induction identification circuit and device applied to a rollator and the rollator, an analog circuit instead of a digital circuit is constructed through a plug connector, a voltage dividing module and a filtering module, and signal interference is reduced through the filtering module, so that a switch module or a switch tube is not needed any more, and the cost is reduced. Compared with a common digital circuit in the field, the circuit does not need to judge whether contact exists or not through '0' or '1' of the voltage, so that compared with a common digital circuit in the field, the effect that the voltage of an output point changes along with the change of gripping force is achieved, and a hardware basis is provided for clearly distinguishing mistaken touch from normal gripping and even other gripping states.

Description

Technical Field

[0001] This utility model relates to the field of human body sensing and recognition, and in particular to a human body sensing and recognition circuit, device and walking aid for use in walking aids. Background Technology

[0002] Due to their specific user groups and scope, walking aids have extremely high safety requirements. The system must be able to start only after the user is fully stable and holding the handlebars, and must be able to stop quickly in case of emergency.

[0003] To determine whether a user is holding the handle properly, existing technologies mostly use sensors or conductive contacts as key identification methods. However, due to the simplicity of the detection methods and their limitations, they are easily affected by interference. Therefore, the detection circuits of existing technologies are usually designed as digital circuits, which determine whether the handle is being gripped by the high or low level of the output terminal. They can usually only determine whether there is contact with the handle, i.e., a yes or no state, and it is difficult to distinguish between accidental touch and normal grip. If the user accidentally touches the handle before fully standing, it can easily lead to misjudgment and activation, affecting the safety of use. Utility Model Content

[0004] To address the problem that existing technologies rely on high and low levels at the output terminal to determine whether a grip is being held, which makes it difficult to avoid false triggering, this invention provides a human body sensing and recognition circuit, device, and walking aid for use in walking aids. It constructs an analog circuit instead of a digital circuit through connectors, voltage divider modules, and filter modules. The filter module reduces signal interference, thus eliminating the need for a switching module or switching transistor. It also eliminates the need to determine contact based on voltage "0" or "1". Compared to the digital circuits commonly used in this field, it achieves the effect of the output voltage changing with gripping force, providing a hardware foundation for clearly distinguishing between false touches, normal gripping, and even other gripping states.

[0005] The following is the technical solution of this utility model.

[0006] Human body sensing and recognition circuits used in mobility aids include:

[0007] The device includes a connector, a voltage divider module, and a filter module. The connector connects to the voltage divider module, and the filter module connects to the voltage divider node of the connector and the voltage divider module. The output of the voltage divider module is used to connect to a controller, and the connector is used to connect to the handlebars of the walking aid.

[0008] In one possible implementation, the voltage divider module includes a pull-up resistor R54, a detection resistor R56, and a first power supply. The first power supply, after passing through the pull-up resistor R54, connects to a connector and the detection resistor R56 to form a voltage divider detection circuit. The other end of the detection resistor R56 is the output terminal of the voltage divider module.

[0009] In one possible implementation, the filtering module includes: a second power supply, an electrostatic discharge protection diode ESD4, a filter capacitor C45, a rectifier diode D1, and a rectifier diode D2. One end of the filter capacitor C45, one end of the electrostatic discharge protection diode ESD4, and the cathode of the rectifier diode D1 are connected to the voltage divider node of the voltage divider module, and the other end is grounded. The cathode of the rectifier diode D2 is connected to the second power supply, and the anode is connected to the voltage divider node.

[0010] In one possible implementation, the first power source is a 3.3V power source.

[0011] In one possible implementation, the second power source is a 5V power source.

[0012] This utility model also provides a human body sensing and recognition device for a walking aid, including a handle and a controller, and further including any of the above-mentioned human body sensing and recognition circuits for a walking aid connected to the handle and the controller.

[0013] As one possible implementation, the grip is a conductive silicone sleeve or a conductive silicon grip.

[0014] This utility model also provides a walking aid, including a vehicle body, and also includes any of the above-mentioned human body sensing and recognition devices applied to the walking aid.

[0015] The beneficial effects of this utility model include:

[0016] An analog detection circuit is constructed using connectors, voltage divider modules, and filter modules. The output voltage changes continuously with the grip force (rather than the "0 / 1" level of digital circuits), providing a hardware foundation for clearly distinguishing between accidental touches, normal grips, and even other grip states. The greater the grip force, the lower the contact resistance and the lower the voltage divider. The controller can quantify the grip force through AD acquisition, avoiding the limitations of traditional digital circuits in distinguishing between accidental touches and normal contact.

[0017] In the filtering module, an ESD protection diode (ESD4) prevents external electrostatic interference from affecting the detection signal and avoids false detections caused by abnormal voltage fluctuations. A filter capacitor (C45) stabilizes the voltage at the voltage divider node, filters out high-frequency noise, and improves signal quality. Rectifier diodes (D1 and D2) prevent damage to the circuit from reverse power connection or abnormal current, enhancing circuit reliability. This provides hardware-based anti-interference protection, eliminating the need for a switching module.

[0018] Compared to existing technologies that rely on multi-stage switching circuits to achieve signal amplification and logic conversion, this invention directly outputs analog signals to the controller through a voltage divider module, simplifying the circuit structure and reducing hardware costs and design complexity.

[0019] In summary, this invention solves the problems of false triggering and weak anti-interference ability in the prior art, realizes accurate recognition of the grip state, significantly improves the safety, reliability and user experience of the walking aid, and simplifies the circuit structure and reduces production costs. Attached Figure Description

[0020] Figure 1 This is a circuit schematic diagram of an embodiment of the present utility model;

[0021] Figure 2 This is an equivalent circuit diagram of the present invention when the grip is held. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Furthermore, to better illustrate this utility model, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this utility model can be implemented without certain specific details. In some instances, methods, means, components, and circuits well-known to those skilled in the art are not described in detail in order to highlight the main points of this utility model.

[0023] In the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. "And / or" in this article is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone.

[0024] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this embodiment, unless otherwise stated, "a plurality of" means two or more.

[0025] Example:

[0026] Human body sensing and recognition circuits used in mobility aids include:

[0027] The device includes a connector, a voltage divider module, and a filter module. The connector connects to the voltage divider module, and the filter module connects to the voltage divider node of the connector and the voltage divider module. The output of the voltage divider module is used to connect to a controller, and the connector is used to connect to the handlebars of the walking aid.

[0028] like Figure 1As shown, in one possible implementation, the voltage divider module includes a pull-up resistor R54, a detection resistor R56, and a first power supply. The first power supply, after passing through the pull-up resistor R54, connects to connector J7 and the detection resistor R56 to form a voltage divider detection circuit. The other end of the detection resistor R56 is the output terminal of the voltage divider module. This circuit uses the TR port (MCUTR) of the controller (MCU) as the core acquisition node. In one possible implementation, the filtering module includes: a second power supply, an ESD protection diode ESD4, a filter capacitor C45, a rectifier diode D1, and a rectifier diode D2. One end of the filter capacitor C45, one end of the ESD protection diode ESD4, and the cathode of the rectifier diode D1 are connected to the voltage divider node of the voltage divider module, and the other ends are grounded. The cathode of the rectifier diode D2 is connected to the second power supply, and the anode is connected to the voltage divider node.

[0029] In one possible implementation, the first power source is a 3.3V power source.

[0030] In one possible implementation, the second power source is a 5V power source.

[0031] exist Figure 2 In the circuit, the grip is connected to the circuit via connector J7, serving as the input contact for detecting human body resistance R57. It should be noted that the human body resistance R57 is not always present; it is only engaged when both hands are gripping the grip.

[0032] The working principle of this embodiment is as follows:

[0033] When a person grips the handle with both hands, such as Figure 2 As shown, the human body resistance (2KΩ-20MΩ) is connected to the circuit, forming a new voltage divider network with R54 and R56. The voltage sampled by the microcontroller port after a person grips the handle is: V = R 57 / (R 57 +R 54 VDD. Where R 57 (For example, 100KΩ) represents the human body resistance (including the grip contact resistance; more precisely, the resistance of the connecting wires can also be included). The contact resistance can also be calculated separately. in The value represents resistivity, L represents the distance between the hand and the handle, and S represents the contact area between the hand and the handle.

[0034] When the conductive silicone grip is not being held, such as Figure 1As shown, the circuit is equivalent to a voltage divider formed by R54 and R56 connected in series. Since there is no human body resistance, R57 (equivalent grip resistance + contact resistance) approaches infinity, therefore the voltage at the voltage divider node is approximately 3.3V. Thus, the controller (MCU) detects a voltage greater than 3V and determines that "no hand is holding the handle." Due to the advantages of analog circuits, this embodiment can not only determine the two extreme cases but also intermediate states. For example, when the total resistance is less than 46KΩ, i.e., the collected voltage value is less than 1V, it is determined that the handle is not being held by a human hand but rather an accidental touch.

[0035] When connected to a controller, this embodiment can be extended to other application scenarios. For example, the controller can determine whether the current grip state and / or grip strength meet the activation conditions. If the activation conditions are met, it acquires the signal from the Hall sensor of the scooter motor and determines the scooter mode based on the signal changes. If the signal from the Hall sensor of the scooter motor does not change, it enters the parking mode; otherwise, it enters the assist mode. In other words, based on the hardware of this embodiment, under the control of an external controller, since a continuous analog voltage can be acquired, the grip strength can be determined based on the voltage. Then, utilizing the principle that the force of the human hand grip is correlated with the force applied to the system, the force of the system can be indirectly determined based on the force of the human hand grip to determine the magnitude of the motor output torque.

[0036] It should be noted that the above working principles and application extensions are only used to help understand the application scenarios of this utility model, and should not be construed as limiting the utility model. The actual scope of protection shall be determined by the claims.

[0037] This embodiment also provides a human body sensing and recognition device for a walking aid, including a handle and a controller, and further including any of the above-mentioned human body sensing and recognition circuits for a walking aid connected to the handle and the controller.

[0038] As one possible implementation, it includes two conductive silicone sleeves or grips, made of engineering plastics doped with conductive materials, which can form a conductive path when the surface comes into contact with the human body.

[0039] This utility model also provides a walking aid, including a vehicle body, and also includes any of the above-mentioned human body sensing and recognition devices applied to the walking aid.

[0040] The beneficial effects of this utility model include:

[0041] An analog detection circuit is constructed using connectors, voltage divider modules, and filter modules. The output voltage changes continuously with the grip force (rather than the "0 / 1" level of digital circuits), providing a hardware foundation for clearly distinguishing between accidental touches, normal grips, and even other grip states. The greater the grip force, the lower the contact resistance and the lower the voltage divider. The controller can quantify the grip force through AD acquisition, avoiding the limitation of traditional digital circuits that can only determine "whether there is contact".

[0042] In the filtering module, an ESD protection diode (ESD4) prevents external electrostatic interference from affecting the detection signal and avoids false detections caused by abnormal voltage fluctuations. A filter capacitor (C45) stabilizes the voltage at the voltage divider node, filters out high-frequency noise, and improves signal quality. Rectifier diodes (D1 and D2) prevent damage to the circuit from reverse power connection or abnormal current, enhancing circuit reliability. This provides hardware-based anti-interference protection, eliminating the need for a switching module.

[0043] Compared to existing technologies that rely on multi-stage switching circuits to achieve signal amplification and logic conversion, this invention directly outputs analog signals to the controller through a voltage divider module, simplifying the circuit structure and reducing hardware costs and design complexity.

[0044] In summary, this embodiment solves the problems of false triggering and weak anti-interference ability in the prior art, realizes accurate recognition of the grip state, significantly improves the safety, reliability and user experience of the walking aid, and simplifies the circuit structure and reduces production costs.

[0045] Through the above description of the embodiments, those skilled in the art will understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0046] The units described as separate components may or may not be physically separate. A component shown as a unit can be one or more physical units; that is, it can be located in one place or distributed in multiple different locations. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0047] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A human body sensing and recognition circuit for a mobility aid, characterized in that, include: The device includes a connector, a voltage divider module, and a filter module. The connector connects to the voltage divider module, and the filter module connects to the voltage divider node of the connector and the voltage divider module. The output of the voltage divider module is used to connect to a controller, and the connector is used to connect to the handlebars of the walking aid.

2. The human body sensing and recognition circuit for a mobility aid as described in claim 1, characterized in that, The voltage divider module includes a pull-up resistor R54, a detection resistor R56, and a first power supply. The first power supply, after passing through the pull-up resistor R54, connects to the connector and the detection resistor R56 to form a voltage divider detection circuit. The other end of the detection resistor R56 is the output terminal of the voltage divider module.

3. The human body sensing and recognition circuit for a walking aid as described in claim 1, characterized in that, The filtering module includes: a second power supply, an electrostatic discharge protection diode ESD4, a filter capacitor C45, a rectifier diode D1, and a rectifier diode D2. One end of the filter capacitor C45, one end of the electrostatic discharge protection diode ESD4, and the cathode of the rectifier diode D1 are connected to the voltage divider node of the voltage divider module, and the other end is grounded. The cathode of the rectifier diode D2 is connected to the second power supply, and the anode is connected to the voltage divider node.

4. The human body sensing and recognition circuit for a walking aid as described in claim 2, characterized in that, The first power supply is a 3.3V power supply.

5. The human body sensing and recognition circuit for a walking aid as described in claim 3, characterized in that, The second power source is a 5V power source.

6. A human body sensing and recognition device for a walking aid, comprising a handlebar and a controller, characterized in that, It also includes a human body sensing and recognition circuit for a walking aid as described in any one of claims 1-5, connected to the grip and controller.

7. The human body sensing and recognition device for a walking aid as described in claim 6, characterized in that, The grip is a conductive silicone sleeve or a conductive silicone grip.

8. A walking aid, comprising a vehicle body, characterized in that, It also includes the human body sensing and recognition device for use in mobility aids as described in claim 6 or 7.

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