Protection circuit for automatic locking of treadmill
By designing a protection circuit on the treadmill and using a single-chip microcomputer and branch circuit to determine the motor lock state and restart it, the problem of the motor burning in the locked state is solved and the motor safety protection is achieved.
Patent Information
- Application Number
- CN202422818780.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-19
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-11-19
AI Technical Summary
The motor of an existing treadmill is prone to burn out due to heat when driven for a long time in a locked state, and lacks an effective protection mechanism.
Design a protection circuit including a single-chip microcomputer, a first branch circuit, a second branch circuit, a protection circuit and a relay. It determines whether the motor is locked and attempts to restart the motor in the locked state. If the motor resumes rotation, the system works. If it does not resume, it enters the locked state to prevent long-term high-current driving.
It effectively prevents the motor from burning out due to excessive current and ensures safe and reliable operation of the system.
Smart Images
Figure CN223474347U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of protection circuits, and more specifically, to a protection circuit for automatic locking of a treadmill. Background Technology
[0002] With the improvement of living standards, treadmills have become a common fitness equipment in homes. To prevent accidents and dangers during treadmill use, existing treadmills are usually equipped with a safety mechanism, including a safety key with a strong magnetic object and a safety lock with a reed switch and iron components. The treadmill's operation or stop is controlled by connecting and disconnecting the safety key and the safety lock. Under certain conditions, the motor will be in a locked state. That is, when current is applied to the stator winding, the rotor will not rotate. If the motor is driven for an extended period while in a locked state, it will burn out due to overheating. Summary of the Invention
[0003] The purpose of this application is to provide a protection circuit for automatic locking of a treadmill, which can solve the above-mentioned technical problems.
[0004] This application provides a protection circuit for automatic locking of a treadmill, including a microcontroller, a first branch circuit, a second branch circuit, a protection circuit, a relay, and a motor. The input terminal of the first branch circuit is connected to the microcontroller, and the output terminal of the first branch circuit is connected to the input terminal of the second branch circuit and the protection circuit. The output terminal of the second branch circuit is connected to the motor through the relay, and the protection circuit is externally powered.
[0005] Preferably, the first branch circuit includes a NOR gate U1, a NOR gate U2, a transistor Q1, and a capacitor C1. The input terminal of the NOR gate U1 is connected to the I / O terminal of the microcontroller, the output terminal of the NOR gate U1 is connected to the input terminal of the NOR gate U2, the output terminal of the NOR gate U2 is connected to the base (b) of the transistor Q1, the emitter (e) of the transistor Q1 is connected to one end of the capacitor C1, the other end of the capacitor C1 and the collector (c) of the transistor Q1 are respectively connected to the second branch circuit, and the emitter (e) of the transistor Q1 and one end of the capacitor C1 are both grounded.
[0006] Preferably, the second branch circuit includes a transistor Q2, a resistor R2, and a NAND gate U3. The base (b) of the transistor Q2 is connected to the output of the NAND gate U3, the emitter (e) of the transistor Q2 is grounded, the collector (c) of the transistor Q2 is connected to the input of the NAND gate U3 through the resistor R2, and the output of the NAND gate U3 is connected to the motor through the relay.
[0007] Preferably, the protection circuit includes resistors R1 and R3. One end of resistor R3 is connected to the power supply, and the other end of resistor R3 is connected to one end of resistor R1 and the input terminal of NAND gate U3. The other end of resistor R1 is grounded.
[0008] Preferably, the motor is a stepper motor.
[0009] Preferably, the power supply voltage is +15V.
[0010] The beneficial effects of this utility model are:
[0011] This utility model provides a protection circuit for automatic locking of a treadmill, including a microcontroller, a first branch circuit, a second branch circuit, a protection circuit, a relay, and a motor. The input terminal of the first branch circuit is connected to the microcontroller, and the output terminal of the first branch circuit is connected to the input terminal of the second branch circuit and the protection circuit. The output terminal of the second branch circuit is connected to the motor through the relay. The protection circuit is externally powered. This utility model uses the first branch circuit to determine whether the motor is locked. When locked, the second branch circuit restarts the motor and attempts to drive it. If the motor resumes rotation, the system starts working; if it does not restart, it enters a locked state to prevent the motor from burning out due to excessive current. Attached Figure Description
[0012] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0013] Figure 1 This is the circuit schematic diagram of this utility model. Detailed Implementation
[0014] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0015] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0016] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0017] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0018] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0019] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0020] like Figure 1As shown, a protection circuit for automatic locking of a treadmill includes a microcontroller, a first branch circuit, a second branch circuit, a protection circuit, a relay, and a motor. The input terminal of the first branch circuit is connected to the microcontroller, and the output terminal of the first branch circuit is connected to the input terminal of the second branch circuit and the protection circuit. The output terminal of the second branch circuit is connected to the motor through the relay. The protection circuit is externally powered. This invention uses the first branch circuit to determine whether the motor is locked. When locked, the second branch circuit restarts the motor and attempts to drive it. If the motor resumes rotation, the system starts working; if it does not restart, it enters a locked state to prevent the motor from burning out due to excessive current.
[0021] like Figure 1 As shown, in this embodiment, the first branch circuit includes a NOR gate U1, a NOR gate U2, a transistor Q1, and a capacitor C1. The input terminal of the NOR gate U1 is connected to the I / O terminal of the microcontroller, the output terminal of the NOR gate U1 is connected to the input terminal of the NOR gate U2, the output terminal of the NOR gate U2 is connected to the base (b) of the transistor Q1, the emitter (e) of the transistor Q1 is connected to one end of the capacitor C1, the other end of the capacitor C1 and the collector (c) of the transistor Q1 are respectively connected to the second branch circuit, and the emitter (e) of the transistor Q1 and one end of the capacitor C1 are both grounded.
[0022] like Figure 1 As shown, in this embodiment, the second branch circuit includes a transistor Q2, a resistor R2, and a NAND gate U3. The base (b) of the transistor Q2 is connected to the output terminal of the NAND gate U3, the emitter (e) of the transistor Q2 is grounded, the collector (c) of the transistor Q2 is connected to the input terminal of the NAND gate U3 through the resistor R2, and the output terminal of the NAND gate U3 is connected to the motor through the relay.
[0023] like Figure 1 As shown, in this embodiment, the protection circuit includes resistors R1 and R3. One end of resistor R3 is connected to the power supply, and the other end of resistor R3 is connected to one end of resistor R1 and the input terminal of NAND gate U3. The other end of resistor R1 is grounded.
[0024] In this embodiment, the motor is a stepper motor.
[0025] In this embodiment, the power supply voltage is +15V.
[0026] Specifically, when the motor is rotating normally, the reference current generated inside the circuit charges capacitor C1, transistor Q1 turns on periodically, and the capacitor discharges periodically. Therefore, the positive voltage of NAND gate U3 is less than the negative voltage, and the voltage at the output of NOT gate U3 remains at a low level. When the motor stops rotating, the input of NOR gate U1 remains at a low level. At this time, the voltage of capacitor C1 continues to rise. Once the positive voltage of NAND gate U3 is greater than the negative voltage of NAND gate U3, the charge on capacitor C1 discharges through the internal path until the positive voltage of NOT gate U3 is less than the negative voltage of NOT gate U3, and then it returns to the charging process. When the motor stops rotating for some reason (i.e., it is in a locked state), the microcontroller will continuously drive the output for 0.5s to try to drive the motor. If the motor resumes rotation, the entire system will start working normally. If the motor still does not rotate within 0.5s, the microcontroller will continuously shut off the output for 4.5s, and the motor will not be restarted within the 4.5s locked state. After the output is turned off for 4.5 seconds, the chip will try to drive the motor again for 0.5 seconds. This lock-up protection and automatic restart function can prevent the motor from burning out due to prolonged high current driving in the locked state.
[0027] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A protection circuit for automatic locking of a treadmill, characterized in that: It includes a microcontroller, a first branch circuit, a second branch circuit, a protection circuit, a relay, and a motor. The input terminal of the first branch circuit is connected to the microcontroller, and the output terminal of the first branch circuit is connected to the input terminal of the second branch circuit and the protection circuit. The output terminal of the second branch circuit is connected to the motor through the relay, and the protection circuit is externally powered.
2. The protection circuit for automatic locking of a treadmill according to claim 1, characterized in that: The first branch circuit includes NOR gate U1, NOR gate U2, transistor Q1, and capacitor C1. The input terminal of NOR gate U1 is connected to the I / O terminal of the microcontroller, the output terminal of NOR gate U1 is connected to the input terminal of NOR gate U2, the output terminal of NOR gate U2 is connected to the base (b) of transistor Q1, the emitter (e) of transistor Q1 is connected to one end of capacitor C1, the other end of capacitor C1 and the collector (c) of transistor Q1 are respectively connected to the second branch circuit, and the emitter (e) of transistor Q1 and one end of capacitor C1 are both grounded.
3. The protection circuit for automatic locking of a treadmill according to claim 1, characterized in that: The second branch circuit includes a transistor Q2, a resistor R2, and a NAND gate U3. The base (b) of the transistor Q2 is connected to the output of the NAND gate U3, the emitter (e) of the transistor Q2 is grounded, the collector (c) of the transistor Q2 is connected to the input of the NAND gate U3 through the resistor R2, and the output of the NAND gate U3 is connected to the motor through the relay.
4. The protection circuit for automatic locking of a treadmill according to claim 3, characterized in that: The protection circuit includes resistors R1 and R3. One end of resistor R3 is connected to the power supply, and the other end of resistor R3 is connected to one end of resistor R1 and the input terminal of NAND gate U3. The other end of resistor R1 is grounded.
5. A protection circuit for automatic locking of a treadmill according to claim 1, characterized in that: The motor is a stepper motor.
6. A protection circuit for automatic locking of a treadmill according to claim 1, characterized in that: The power supply voltage is +15V.