Motor stalling detection circuit, mainboard and intelligent lock
By designing a motor blockage detection circuit, including a motor drive module and a detection module, the problem of difficulty in accurately detecting a motor blockage and timely power supply in the prior art is solved, and the safe use of the motor is achieved.
Patent Information
- Application Number
- CN202421728079.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-19
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2034-07-19
AI Technical Summary
The prior art is difficult to accurately detect whether the motor is blocked and stop power supply in time when the motor is blocked, resulting in damage to the motor.
A motor blocking detection circuit is designed, including a motor drive module and a detection module. The motor drive module outputs the motor working current through the motor drive end, and the detection module collects the motor blocking signal through the motor blocking acquisition end, and controls the motor drive module to stop the motor driving operation when the blocking is detected.
Accurate detection of motor blockage and rotation, and timely stop power supply during blockage, protecting the safe use of the motor.
Smart Images
Figure CN222852194U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of motor stall detection, and in particular to a motor stall detection circuit, a mainboard and an intelligent lock. Background Art
[0002] A motor is an electromagnetic device that converts electrical energy into kinetic energy based on the law of electromagnetic induction. However, due to excessive motor load or human obstruction, the motor may still output torque at 0 rpm, which is called motor stall. The power factor of a motor stall is extremely low, and the current during stall is much greater than the rated current of the motor during normal rotation. If the stall lasts for a long time, the motor will burn out. Utility Model Content
[0003] The purpose of the utility model is to overcome the shortcomings and deficiencies in the prior art and to provide a motor stall detection circuit, a main board and a smart lock, which can accurately detect whether the motor is stalled and stop power supply when the motor is stalled to protect the safe use of the motor.
[0004] An embodiment of the utility model provides a motor stall detection circuit, including a motor drive module and a detection module, wherein the motor drive module includes a motor drive end, a motor stall detection end and a control input end; the detection module includes a motor stall acquisition end and a control output end;
[0005] The motor driving end of the motor driving module is connected to the motor for driving the motor to rotate; the motor stall collection end of the detection module is connected to the motor stall detection end of the motor driving module for collecting the motor stall signal; the control output end of the detection module is connected to the control input end of the motor driving module for controlling the motor driving module to stop the motor driving operation when the motor stall signal is collected.
[0006] A second embodiment of the present application provides a mainboard, comprising the motor stall detection circuit as described above.
[0007] The third embodiment of the present application provides a smart lock, including a motor and the main board as described above, wherein the motor stall detection circuit of the main board is connected to the motor to drive the motor to stop rotating.
[0008] Compared with the prior art, the utility model outputs the motor working current to the motor through the motor driving end of the motor driving module to drive the motor to rotate, and at the same time, connects the motor stall detection end of the motor driving module through the motor stall collection end of the detection module to collect the motor stall signal. When the motor stalls, the motor stall collection end of the detection module collects the motor stall signal, and at this time the detection module controls the motor driving module to stop the motor driving work, which can accurately detect whether the motor is stalled, and stop the power supply when the motor is stalled to protect the safe use of the motor.
[0009] In order to more clearly understand the present invention, the specific implementation of the present invention will be described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 The figure is a schematic diagram of a motor stall detection circuit according to an embodiment of the utility model.
[0011] Figure 2 The present invention is a circuit diagram of a motor stall detection circuit according to an embodiment of the present invention.
[0012] Figure 3 The figure is a circuit diagram of a motor drive module according to an embodiment of the present utility model.
[0013] Figure 4 This is a schematic diagram of a mainboard according to an embodiment of the present invention.
[0014] Figure 5 A schematic diagram of a smart lock according to an embodiment of the present invention.
[0015] 100. Motor stall detection circuit; 10. Main board; 1. Smart lock. DETAILED DESCRIPTION
[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0017] See also Figure 1-2 , Figure 1 1 is a schematic diagram of a motor stall detection circuit 100 according to a first embodiment of the present utility model. Figure 2It is a circuit diagram of the motor stall detection circuit 100 of the first embodiment of the utility model. The motor stall detection circuit 100 includes: a motor drive module U4 and a detection module U5. The motor drive module U4 includes a motor drive end, a motor stall detection end and a control input end; the detection module U5 includes a motor stall acquisition end and a control output end +7V4_Battery.
[0018] The motor driving end of the motor driving module U4 is connected to the motor for driving the motor to rotate; the motor stalling acquisition end of the detection module U5 is connected to the motor stalling detection end of the motor driving module U4 for collecting the motor stalling signal; the control output end +7V4_Battery of the detection module U5 is connected to the control input end ( Figure 2 Pin 8 of U4 in the control module is used to control the motor drive module U4 to stop the motor drive operation when a motor stall signal is collected.
[0019] The control input terminal of the motor drive module U4 is a connection terminal for inputting a logic working electrical signal, and the logic working electrical signal refers to a power supply for supporting the on-off relationship control of the conductive components of the internal circuit of the motor drive module U4. The motor drive module U4 also includes a power supply VM input terminal ( Figure 2 Pin 1 of U4 in the figure, the power supply VM input terminal is a connection terminal for inputting the power supply VM. The power supply VM is a power supply that provides the motor working current to the motor drive end according to the conduction relationship of the conduction components of the internal circuit of the motor drive module U4.
[0020] The motor stall signal output by the motor stall detection end may be a loop electrical signal output by the motor drive end and passing through the motor, such as a current signal; the motor stall signal may also be a voltage signal obtained by charging the current signal output by the motor drive end through a charging component. Therefore, the motor stall signal may be a current signal or a voltage signal.
[0021] Compared with the prior art, the utility model outputs the motor working current to the motor through the motor driving end of the motor driving module U4 to drive the motor to rotate, and at the same time, connects the motor stall detection end of the motor driving module U4 through the motor stall collection end of the detection module U5 to collect the motor stall signal. When the motor stalls, the motor stall collection end of the detection module U5 collects the motor stall signal, and at this time, the detection module U5 controls the motor driving module U4 to stop the motor driving work, which can accurately detect whether the motor is stalled, and stop the power supply when the motor is stalled to protect the safe use of the motor.
[0022] See also Figure 2In a feasible embodiment, the detection module U5 includes an RC circuit and a main controller (not shown in the figure); the RC circuit includes a circuit input end and a circuit output end, and the main controller includes a detection signal input end and a control end;
[0023] The circuit input end of the RC circuit is the motor drive signal detection end of the detection module U5, the circuit output end of the RC circuit is connected to the detection signal input end of the main controller, and the control end of the main controller is the control output end of the detection module U5.
[0024] Among them, the RC circuit includes a detection resistor R59 and a detection capacitor C25; the first end of the detection resistor R59 is connected to the motor stall detection end of the motor drive module U4, the second end of the detection resistor R59 is grounded via the detection capacitor C25, and the detection signal input end of the main controller is connected to the second end of the detection resistor R59.
[0025] Taking the electrical signal as current as an example, when the motor stall detection terminal ( Figure 2 When the current output by pin 4 of U4 in the circuit increases, due to the characteristics of the detection capacitor C25 as AC resistance and DC resistance, the current output by the motor stall detection end of the motor drive module U4 flows to the detection capacitor C25 through the detection resistor R59, and since the detection signal input end of the main controller is connected to the second end of the detection resistor R59, the current will also flow to the detection signal input end of the main controller through the detection resistor R59. At this time, it means that the detection module collects the motor stall signal, so the control end of the main controller of the detection module stops outputting the logic working electrical signal to the control input end of the motor drive module U4, so that the motor drive end of the motor drive module U4 stops outputting the motor working current to the motor, thereby stopping driving the motor to rotate.
[0026] Taking the electrical signal as voltage as an example, when the current output by the motor stall detection end of the motor drive module U4 increases, due to the characteristics of the detection capacitor C25 as AC resistance and DC resistance, the current output by the motor stall detection end of the motor drive module U4 flows to the detection capacitor C25 through the detection resistor R59 to charge the detection capacitor C25. Since the detection signal input end of the main controller is connected to the second end of the detection resistor R59, that is, the detection signal input end of the main controller is connected to one end of the capacitor C25, and the other end of the capacitor C25 is grounded, the detection signal input end of the main controller can obtain the voltage increased by the detection capacitor C25 due to charging. At this time, it indicates that the detection module has collected the motor stall signal, and the control end of the main controller stops supplying power to the control input end of the motor drive module U4, so that the motor drive end of the motor drive module U4 stops outputting the motor working current to the motor, thereby stopping driving the motor to rotate.
[0027] In this embodiment, the circuit structure of the RC circuit can be used to accurately obtain changes in the electrical signal output by the motor stall detection end of the motor drive module U4, so that when the motor stalls and causes the electrical signal output by the motor stall detection end to increase, it is determined that a motor stall signal has been collected, so that the main controller stops supplying power to the motor drive module U4 in time, thereby stopping the drive motor from rotating.
[0028] In a feasible embodiment, the motor stall detection terminal of the motor driving module U4 is grounded via several resistors. For example, the motor stall detection terminal of the motor driving module U4 can be grounded via resistors R57 and R58, that is, resistors R57 and R58 are connected in parallel.
[0029] In this embodiment, when the electrical signal outputted from the motor stall detection terminal of the motor driving module U4 is of a stable magnitude, the electrical signal may flow to the ground through a plurality of resistors to complete the circuit loop.
[0030] In a feasible embodiment, the detection module U5 further includes a sleep signal output terminal ( Figure 2 Pin 7 of U4), the motor driving module U4 also includes a sleep signal input terminal;
[0031] The sleep signal output end of the detection module U5 is connected to the sleep signal input end of the motor driving module U4. The detection module U5 is used to send a sleep signal to the sleep signal input end of the motor driving module U4 through the sleep signal output end, so that the motor driving module U4 enters a sleep state.
[0032] In this embodiment, the motor driving module U4 can be controlled by the sleep signal output terminal of the detection module U5 to make the motor driving module U4 enter the sleep state.
[0033] In a feasible embodiment, the motor driving end of the motor driving module U4 includes a first driving end and a second driving end; the driving input end of the motor includes a first input end and a second input end.
[0034] The first driving end and the second driving end of the motor driving module U4 are connected to the first input end and the second input end of the motor respectively.
[0035] When the second driving end of the motor driving module U4 is connected to the motor stall detection end, the motor working current output by the first driving end of the motor driving module U4 flows to the motor stall detection end of the motor driving module U4 through the motor and the second driving end of the motor driving module U4; when the first driving end of the motor driving module U4 is connected to the motor stall detection end of the motor driving module U4, the motor working current output by the second driving end of the motor driving module U4 flows to the motor stall detection end of the motor driving module U4 through the motor and the first driving end of the motor driving module U4.
[0036] See also Figure 3 The circuit structure of the motor drive module U4 can be as follows Figure 3 As shown, the first driving end of the motor driving module U4 is connected to the power supply VM of the motor driving module U4 through the first switch gate, and is connected to the motor stall detection end through the second switch gate; the first driving end of the motor driving module U4 is connected to the power supply VM of the motor driving module U4 through the third switch gate, and is connected to the motor stall detection end through the fourth switch gate. Among them, the power supply output by the control output end of the detection module U5 is a logical working electrical signal, which is used to control the on-off relationship of the first switch gate, the second switch gate, the third switch gate and the fourth switch gate according to the support. In the case that the detection module U5 normally provides the logical working electrical signal, the on-off relationship of the first switch gate, the second switch gate, the third switch gate and the fourth switch gate can be controlled according to the control signal received by the first signal input end and the second signal input end of the motor driving module U4. Among them, under normal circumstances, the on-off states of the first switch gate and the fourth switch gate are the same, and the on-off states of the second switch gate and the third switch gate are the same. For example, when the first signal input end of the motor driving module U4 receives a control signal, the first switch gate is turned on, the second switch gate is turned off, the third switch gate is turned off, and the fourth switch gate is turned on. At this time, the motor working current output by the first driving end of the motor driving module U4 flows to the motor stall detection end of the motor driving module U4 via the motor, the second driving end of the motor driving module U4 and the fourth switch gate, and then flows to the motor driving signal detection end of the ground or detection module U5; when the second signal input end of the motor driving module U4 receives a control signal, the first switch gate is closed, the second switch gate is turned on, the third switch gate is turned on, and the fourth switch gate is closed. At this time, the motor working current output by the second driving end of the motor driving module U4 flows to the motor stall detection end of the motor driving module U4 via the motor, the first driving end of the motor driving module U4 and the second switch gate, and then flows to the motor driving signal detection end of the ground or detection module U5.
[0037] In this embodiment, the rotation direction of the motor can be accurately controlled through the first driving end and the second driving end of the motor driving end.
[0038] In a feasible embodiment, the control output end of the detection module U5 includes a first signal output end and a second signal output end, and the control input end of the motor drive module U4 includes a first signal input end ( Figure 2 Pin 6 of U4) and the second signal input terminal ( Figure 2 Pin 5 of U4 in the circuit).
[0039] The first signal output terminal and the second signal output terminal of the detection module U5 are respectively connected to the first signal input terminal and the second signal input terminal of the motor driving module U4; the detection module U5 is used to control the motor working current output by the first driving end or the second driving end of the motor driving module U4 according to the first signal output terminal and the control signal sent to the first signal input terminal of the motor driving module U4, or the control signal sent by the second signal output terminal to the second signal input terminal of the motor driving module U4.
[0040] In this embodiment, the motor operating current outputted from the first driving end and the second driving end of the motor driving module U4 can be controlled according to the control signal outputted from the first signal output end and the second signal output end of the detection module U5 to control the direction of motor rotation.
[0041] In a feasible embodiment, the first driving end of the motor driving module U4 is connected to the second driving end of the motor driving module U4 via a filter capacitor C18.
[0042] In this embodiment, the filter capacitor C18 can be used to filter the motor operating current output by the first drive end or the second drive end of the motor drive module U4, and the filter capacitor C18 can also be charged by the motor operating current output by the first drive end or the second drive end of the motor drive module U4, providing buffer time for the motor when the first drive end and the second drive end of the motor drive module U4 switch outputs.
[0043] See also Figure 4 , a second embodiment of the present application provides a mainboard 10, comprising the motor stall detection circuit 100 as described above.
[0044] It should be noted that the mainboard 10 provided in the second embodiment of the present application and the motor stall detection circuit 100 in the first embodiment of the present application have the same concept, and the specific implementation process is detailed in the first embodiment and will not be repeated here.
[0045] See also Figure 5 The third embodiment of the present application provides a smart lock 1, including a motor and the main board 10 as described above, wherein the motor stall detection circuit 100 of the main board 10 is connected to the motor to drive the motor to stop.
[0046] It should be noted that the smart lock 1 provided in the second embodiment of the present application and the motor stall detection circuit 100 in the first embodiment of the present application belong to the same concept, and the specific implementation process is detailed in the first embodiment and will not be repeated here.
[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A motor stall detection circuit, characterized in that: It includes a motor drive module and a detection module, wherein the motor drive module includes a motor drive end, a motor stall detection end and a control input end; the detection module includes a motor stall acquisition end and a control output end; The motor driving end of the motor driving module is connected to the motor for driving the motor to rotate; the motor stalling acquisition end of the detection module is connected to the motor stalling detection end of the motor driving module for collecting the motor stalling signal; The control output end of the detection module is connected to the control input end of the motor drive module, and is used to control the motor drive module to stop the motor driving operation when a motor stall signal is collected.
2. The motor stall detection circuit according to claim 1, characterized in that: The detection module includes an RC circuit and a main controller; the RC circuit includes a circuit input end and a circuit output end, and the main controller includes a detection signal input end and a control end; The circuit input end of the RC circuit is the motor drive signal detection end of the detection module, the circuit output end of the RC circuit is connected to the detection signal input end of the main controller, and the control end of the main controller is the control output end of the detection module.
3. The motor stall detection circuit according to claim 2, characterized in that: The RC circuit includes a detection resistor and a detection capacitor; the first end of the detection resistor is connected to the motor stall detection end of the motor drive module, the second end of the detection resistor is grounded via the detection capacitor, and the detection signal input end of the main controller is connected to the second end of the detection resistor.
4. The motor stall detection circuit according to any one of claims 1 to 3, characterized in that: The motor driving end of the motor driving module includes a first driving end and a second driving end; the driving input end of the motor includes a first input end and a second input end; The first driving end and the second driving end of the motor driving module are connected to the first input end and the second input end of the motor respectively; When the second driving end of the motor driving module is connected to the motor stall detection end, the motor working current outputted via the first driving end of the motor driving module flows to the motor stall detection end of the motor driving module through the motor and the second driving end of the motor driving module; When the first driving end of the motor driving module is connected to the motor stall detection end, the motor operating current outputted via the second driving end of the motor driving module flows to the motor stall detection end of the motor driving module through the motor and the first driving end of the motor driving module.
5. The motor stall detection circuit according to claim 4, characterized in that: The first driving end of the motor driving module is connected to the second driving end of the motor driving module via a filter capacitor.
6. The motor stall detection circuit according to claim 4, characterized in that: The control output end of the detection module includes a first signal output end and a second signal output end, and the control input end of the motor driving module includes a first signal input end and a second signal input end; The first signal output terminal and the second signal output terminal of the detection module are respectively connected to the first signal input terminal and the second signal input terminal of the motor driving module; the detection module is used to control the motor working current output by the first driving end or the second driving end of the motor driving module according to the first signal output terminal and the control signal sent to the first signal input terminal of the motor driving module, or the control signal sent by the second signal output terminal to the second signal input terminal of the motor driving module.
7. The motor stall detection circuit according to any one of claims 1 to 3, characterized in that: The motor stall detection terminal of the motor drive module is grounded via a plurality of resistors.
8. The motor stall detection circuit according to any one of claims 1 to 3, characterized in that: The detection module further includes a sleep signal output terminal, and the motor driving module further includes a sleep signal input terminal; The sleep signal output end of the detection module is connected to the sleep signal input end of the motor driving module, and the detection module is used to send a sleep signal to the sleep signal input end of the motor driving module through the sleep signal output end, so that the motor driving module enters a sleep state.
9. A motherboard, characterized in that: The invention comprises a motor stall detection circuit as claimed in any one of claims 1 to 8.
10. A smart lock, characterized in that: It comprises a motor and a mainboard as claimed in claim 9, wherein a motor stall detection circuit of the mainboard is connected to the motor to drive the motor to stop.