Projector DC motor stall control method, circuit, device, medium and equipment

Abstract

The present disclosure relates to a method, circuit, device, medium and equipment for controlling a DC motor stall of a projector, including: obtaining an input voltage of a motor driver IC corresponding to the projector, the motor driver IC is used to drive a corresponding lens of the projector to reciprocate in a fixed direction, obtaining a reference voltage currently input in the same direction by a motor comparison device of the projector, comparing the reference voltage with the input voltage based on the motor comparison device, and if the reference voltage is greater than the input voltage, generating a low-level signal to be sent to the system-on-chip SOC of the projector, the low-level signal generates a rotation abnormality signal through the SOC, and controlling the drive motor of the corresponding lens of the projector to stop rotating based on the rotation abnormality signal. Thus, a DC motor stall detection circuit is adopted to simplify the mechanical structure of the projector limit control, and the manufacturing cost of the projector is reduced while ensuring the accuracy of the stall limit control.

Description

Technical Field

[0001] The present disclosure relates to the field of automatic control, and in particular to a method, circuit, device, medium and equipment for controlling a DC motor stall in a projector. Background Art

[0002] The realization of the autofocus function on the projector requires a motor to rotate the lens to focus. Conventional motors include DC motors and stepper motors. In the related technology, stepper motors are commonly used on projectors. In the process of controlling the rotation of the projector lens, the stepper motor needs to add additional limit parts (such as optical coupling limit or hard switch limit) for the limit end detection of the lens, which increases the production cost of the projector. In addition, the stepper motor is large in size, and many projectors are limited by the structure, resulting in a complex limit structure of the projector, which increases the production cost of the projector. Summary of the invention

[0003] In order to overcome the problems existing in the related art, the present disclosure provides a projector DC motor stall control method, circuit, device, medium and equipment.

[0004] According to a first aspect of an embodiment of the present disclosure, a method for controlling a DC motor stall of a projector is provided, the method comprising:

[0005] In response to detecting a change in the sampling resistance of the projector, an input voltage of a motor driver IC corresponding to the projector is obtained, wherein the motor driver IC is used to drive a lens corresponding to the projector to reciprocate in a fixed direction;

[0006] Obtaining a reference voltage currently inputted in the same direction by a motor comparison device of the projector;

[0007] The motor comparison device compares the reference voltage with the input voltage, and if the reference voltage is greater than the input voltage, generates a low level signal and sends it to the system-on-chip (SOC) of the projector;

[0008] In response to the low level signal, a rotation abnormality signal is generated by the SOC, and based on the rotation abnormality signal, a driving motor of a corresponding lens of the projector is controlled to stop rotating.

[0009] Optionally, the method further comprises:

[0010] If the reference voltage is less than or equal to the output voltage, a high level signal is generated and sent to the SOC of the projector;

[0011] In response to the high level signal, a normal driving signal is generated by the SOC, and the normal driving signal is sent to a driving motor corresponding to the projector.

[0012] According to a second aspect of an embodiment of the present disclosure, a DC motor stall control circuit for a projector is provided, the circuit comprising a motor drive module, a motor comparison module, a lens drive motor, a SOC control module, a power supply module, a first sampling resistor and a second sampling resistor;

[0013] The first end of the first sampling resistor is connected to the power supply module, and the second end of the first sampling resistor is connected to the power supply end of the motor driving module and the first input end of the motor comparison module;

[0014] The output end of the motor driving module is connected to the input end of the lens driving motor, and the steering control end of the motor driving module is connected to the first end of the SOC control module;

[0015] The power supply end of the motor comparison module is connected to the power supply module, the second input end of the motor comparison module is connected to the first end of the second sampling resistor, and the output end of the motor comparison module is connected to the SOC control module;

[0016] The second end of the second sampling resistor is connected to the power module.

[0017] Optionally, the output end of the motor driving module includes a first sub-output end and a second sub-output end, and the input end of the lens driving motor includes a first sub-input end and a second sub-output end;

[0018] The motor driving module outputs a forward driving signal to the lens driving motor through the first sub-output terminal;

[0019] The motor driving module outputs a reverse driving signal to the lens driving motor through the second sub-output terminal.

[0020] Optionally, the circuit further includes a third sampling resistor;

[0021] A first end of the third sampling resistor is connected to an input end of the motor comparison module; a second end of the third sampling resistor is grounded.

[0022] Optionally, the motor drive module is used to compare a first input voltage inputted at the first input terminal with a second input voltage inputted at the second input terminal, and output a high signal to the SOC control module when the first input voltage is greater than or equal to the second input voltage; and output a low signal to the SOC control module when the first input voltage is less than the second input voltage.

[0023] Optionally, the SOC control module is used to generate a brake instruction for the corresponding drive motor of the projector in response to the received low-level signal, and the brake instruction is used to control the corresponding drive motor of the projector to stop rotating.

[0024] According to a third aspect of an embodiment of the present disclosure, a device for controlling a DC motor stall in a projector is provided, the device comprising:

[0025] A first acquisition module, configured to acquire an output voltage of a motor driver IC corresponding to the projector in response to detecting a change in a sampling resistance of the projector, wherein the motor driver IC is configured to drive a lens corresponding to the projector to reciprocate in a fixed direction;

[0026] A second acquisition module is used to acquire a reference voltage currently inputted in the same direction by a motor comparison device of the projector;

[0027] A generating module, configured to compare the reference voltage with the output voltage based on the motor comparison device, and if the reference voltage is greater than the output voltage, generate a low level signal and send it to the system-on-chip (SOC) of the projector;

[0028] The execution module is used to generate a rotation abnormality signal through the SOC in response to the low-level signal, and control the projector to start a blocking limit device based on the rotation abnormality signal, wherein the blocking limit device is used to prevent the lens from rotating to an extreme position.

[0029] According to a fourth aspect of an embodiment of the present disclosure, there is provided a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, the steps of any one of the methods described in the first aspect of the present disclosure are implemented.

[0030] According to a fifth aspect of an embodiment of the present disclosure, there is provided an electronic device, comprising the projector DC motor stall control circuit as described in any one of the second aspects of the present disclosure.

[0031] The technical solution provided by the embodiments of the present disclosure may have the following beneficial effects:

[0032] Through the above scheme, in response to detecting the change of the sampling resistance of the projector, the input voltage of the motor driver IC corresponding to the projector is obtained, the motor driver IC is used to drive the corresponding lens of the projector to reciprocate in a fixed direction, the reference voltage currently input in the same direction by the motor comparison device of the projector is obtained, and the reference voltage is compared with the input voltage based on the motor comparison device. If the reference voltage is greater than the input voltage, a low-level signal is generated and sent to the system-on-chip SOC of the projector, and a rotation abnormality signal is generated by the SOC in response to the low-level signal, and the drive motor of the corresponding lens of the projector is controlled to stop rotating based on the rotation abnormality signal. Thus, the DC motor stall detection circuit is adopted to simplify the mechanical structure of the projector limit control, and the manufacturing cost of the projector is reduced while ensuring the accuracy of the stall limit control.

[0033] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0035] Figure 1 The present invention is a flow chart showing a method for controlling a DC motor stall of a projector according to an exemplary embodiment.

[0036] Figure 2 The diagram is a schematic diagram of a DC motor stall control circuit for a projector according to an exemplary embodiment.

[0037] Figure 3 The figure is a schematic diagram showing a working process of a DC motor according to an exemplary embodiment.

[0038] Figure 4 The invention is a block diagram of a device for controlling a DC motor stall of a projector according to an exemplary embodiment. DETAILED DESCRIPTION

[0039] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0040] It should be noted that all actions of acquiring signals, information or data in this application are carried out in compliance with the relevant data protection laws and policies of the country where they are located, and with the authorization given by the owner of the corresponding device.

[0041] Figure 1 FIG. 1 is a flow chart showing a method for controlling a DC motor stall in a projector according to an exemplary embodiment. Figure 1 As shown, the method includes:

[0042] In step S11, in response to detecting a change in the sampling resistance of the projector, an input voltage of a motor driver IC corresponding to the projector is acquired, and the motor driver IC is used to drive a lens corresponding to the projector to reciprocate in a fixed direction.

[0043] For example, in this embodiment, a DC motor is used to implement stall detection of the corresponding lens of the projector. Through the DC motor stall detection circuit, combined with the small size of the DC motor and the fact that limit detection does not require additional limit parts, the cost of the projector limit control is reduced and the limit control accuracy of the projector corresponding lens is improved.

[0044] In this embodiment, the change in the focal length of the projector lens can be calculated by other corresponding autofocus algorithms. The projector determines whether the focus distance of the current lens is moving forward or backward based on the environmental information of the current environment, and controls the drive motor to output drive voltages of different sizes and directions through sampling resistors, thereby driving the mechanical structure corresponding to the lens to move, so that the corresponding lens of the projector reciprocates in a fixed direction. When the sampling resistor change of the projector is detected, it means that based on the focus algorithm, it is necessary to control the projector lens to reciprocate for focusing. Detect the output voltage of the motor driver IC corresponding to the projector.

[0045] The motor driver IC is used to output forward control voltage and reverse control voltage to the drive motor corresponding to the lens according to the control signal, thereby driving the lens corresponding to the projector to reciprocate in a fixed direction, thereby achieving precise focusing of the projector.

[0046] In step S12, the reference voltage currently input in the same direction to the motor comparison device of the projector is obtained.

[0047] For example, the projector of this embodiment is equipped with a motor comparison device for comparing the magnitude relationship between the input voltage in the current motor driver IC and the reference voltage, and outputting different control signals to the SOC control module according to different comparison results, so that the SOC control module executes different control results according to different control signals, and the control results include sending a stop signal to control the drive motor to stop rotating, etc.

[0048] The reference voltage is related to the sampling resistor. Different sampling resistors correspond to different reference voltages. In this embodiment, the input voltage of the current driving current is determined based on the reference voltage to determine whether there is any abnormality in the current rotation of the projector lens.

[0049] In step S13, the reference voltage is compared with the output voltage based on the motor comparison device. If the reference voltage is greater than the input voltage, a low level signal is generated and sent to the system-on-chip (SOC) of the projector.

[0050] For example, in this embodiment, the input voltage of the motor driver IC is compared with the reference voltage to determine the magnitude relationship between the two. When the input voltage of the motor driver IC is less than the reference voltage, it is determined that the current motor rotation is abnormal, thereby generating a low-level signal and sending it to the SOC of the projector. The SOC processes the current motor rotation based on the low-level signal.

[0051] In step S14, a rotation abnormality signal is generated by the SOC in response to the low level signal, and a driving motor of a corresponding lens of the projector is controlled to stop rotating based on the rotation abnormality signal.

[0052] For example, after receiving the low-level signal transmitted by the motor comparison device, the SOC determines that the drive motor corresponding to the current projector lens rotates abnormally. The SOC generates a rotation abnormality signal, and controls the drive motor of the corresponding lens of the projector to stop rotating based on the rotation abnormality signal. In this embodiment, the level signal output by the motor comparison device is detected based on the SOC. When the low-level signal output by the motor comparison device is determined, it is determined that the current motor rotates abnormally, that is, the motor currently rotates to the maximum limit position or the minimum limit position, and then the drive motor of the corresponding lens of the projector is controlled to stop rotating according to the SOC, thereby realizing the control limit of the projector lens.

[0053] Optionally, in some embodiments, the method further comprises:

[0054] If the reference voltage is less than or equal to the input voltage, a high level signal is generated and sent to the SOC of the projector;

[0055] In response to the high level signal, a normal driving signal is generated by the SOC, and the normal driving signal is sent to a driving motor corresponding to the projector.

[0056] For example, when the reference voltage is less than or equal to the input voltage, a high-level signal is generated by the motor comparison device and sent to the SOC. When the SOC determines that the motor comparison device outputs a high-level signal, a normal driving signal is generated to the drive motor corresponding to the projector. After receiving the driving signal, the drive motor performs the position action of the projector lens based on the control resistor.

[0057] Through the above scheme, in response to detecting the change of the sampling resistance of the projector, the output voltage of the motor driver IC corresponding to the projector is obtained, the motor driver IC is used to drive the corresponding lens of the projector to reciprocate in a fixed direction, the reference voltage currently input in the same direction of the motor comparison device of the projector is obtained, the reference voltage and the output voltage are compared based on the motor comparison device, if the reference voltage is greater than the output voltage, a low-level signal is generated and sent to the system-on-chip SOC of the projector, a rotation abnormality signal is generated through the SOC in response to the low-level signal, and the projector is controlled to start the stall limit device based on the rotation abnormality signal, and the stall limit device is used to prevent the lens from rotating to the extreme position. Thus, the DC motor stall detection circuit is adopted to simplify the mechanical structure of the projector limit control, and the manufacturing cost of the projector is reduced under the premise of ensuring the accuracy of the stall limit control.

[0058] For example, based on the same inventive concept, an embodiment of the present disclosure further provides a projector DC motor stall control circuit, the circuit comprising a motor drive module, a motor comparison module, a lens drive motor, a SOC control module, a power supply module, a first sampling resistor and a second sampling resistor;

[0059] The first end of the first sampling resistor is connected to the power supply module, and the second end of the first sampling resistor is connected to the power supply end of the motor driving module and the first input end of the motor comparison module;

[0060] The output end of the motor driving module is connected to the input end of the lens driving motor, and the steering control end of the motor driving module is connected to the first end of the SOC control module;

[0061] The power supply end of the motor comparison module is connected to the power supply module, the second input end of the motor comparison module is connected to the first end of the second sampling resistor, and the output end of the motor comparison module is connected to the SOC control module;

[0062] The second end of the second sampling resistor is connected to the power module.

[0063] Optionally, the output end of the motor driving module includes a first sub-output end and a second sub-output end, and the input end of the lens driving motor includes a first sub-input end and a second sub-output end;

[0064] The motor driving module outputs a forward driving signal to the lens driving motor through the first sub-output terminal;

[0065] The motor driving module outputs a reverse driving signal to the lens driving motor through the second sub-output terminal.

[0066] Optionally, the circuit further includes a third sampling resistor;

[0067] A first end of the third sampling resistor is connected to an input end of the motor comparison module; a second end of the third sampling resistor is grounded.

[0068] Optionally, the motor drive module is used to compare a first input voltage inputted at the first input terminal with a second input voltage inputted at the second input terminal, and output a high signal to the SOC control module when the first input voltage is greater than or equal to the second input voltage; and output a low signal to the SOC control module when the first input voltage is less than the second input voltage.

[0069] Optionally, the SOC control module is used to generate a brake instruction for the corresponding drive motor of the projector in response to the received low-level signal, and the brake instruction is used to control the corresponding drive motor of the projector to stop rotating.

[0070] For example, the power module VDD is used to provide power to the third sampling resistor, the power module VDD is connected to the first sampling resistor to provide power to the motor drive module, and the power module VDD is used to provide power to the SOC control module. The sampling resistor can be adjusted according to actual conditions, and the value of the sampling resistor is not specifically limited in this embodiment. The motor drive module is used to output a driving voltage to drive the motor to rotate forward or reverse. The drive motor is used to adjust the lens of the projector to achieve the focus of the lens. The motor comparison module is used to compare the magnitude relationship between the input voltage of the motor drive module and the reference voltage. When the input voltage is lower than the reference voltage, a low-level signal is output to the SOC control module to indicate that the current DC motor rotation is abnormal. The SOC control module generates a control signal for stopping rotation and braking according to the received low-level signal and sends it to the motor drive module, so that the motor drive module controls the motor to stop rotating.

[0071] Through the above scheme, in response to detecting the change of the sampling resistance of the projector, the input voltage of the motor driver IC corresponding to the projector is obtained, the motor driver IC is used to drive the corresponding lens of the projector to reciprocate in a fixed direction, the reference voltage currently input in the same direction by the motor comparison device of the projector is obtained, and the reference voltage is compared with the input voltage based on the motor comparison device. If the reference voltage is greater than the input voltage, a low-level signal is generated and sent to the system-on-chip SOC of the projector, and a rotation abnormality signal is generated by the SOC in response to the low-level signal, and the drive motor of the corresponding lens of the projector is controlled to stop rotating based on the rotation abnormality signal. Thus, the DC motor stall detection circuit is adopted to simplify the mechanical structure of the projector limit control, and the manufacturing cost of the projector is reduced while ensuring the accuracy of the stall limit control.

[0072] Figure 2 is a schematic diagram of a projector DC motor stall control circuit according to an exemplary embodiment. Figure 2 The circuit includes a motor driver IC-U1, a motor comparator-U2, a first sampling resistor R1, a second sampling resistor R2, a third sampling resistor R3, a resistor R6810, and a drive motor DCM.

[0073] The input terminals IN1 and IN2 of the motor driver U1 input high and low levels through other control algorithms, thereby controlling U1 to output a forward drive signal for the drive motor from the output terminal OUT1, or controlling U2 to output a reverse drive signal for the drive motor from the output terminal OUT2. This realizes the forward, reverse, stop or brake actions of the drive motor.

[0074] For example, as shown in Table 1, it is the specific control logic of the drive motor:

[0075] Table 1: Drive motor control logic table

[0076]

[0077] U2 is the voltage comparator IC in the control circuit. It obtains the output state by comparing the same direction and reverse output voltages. First, the reverse input 3 pin selects a suitable resistance value through resistors R2 and R3 to set a reference voltage. R1 is a sampling resistor. When the motor rotates normally, the voltage of the same direction input 1 pin is higher than that of the 3 pin. The comparator 4 pin outputs a high level. The main control SOC recognizes the high level and determines that the motor is rotating normally. When the motor rotates to the end, the motor resistance suddenly increases, the working current increases, the voltage of the same direction input 1 pin becomes lower, and it will be lower than the reference voltage of the 3 pin. The comparator 4 pin outputs a low level. The main control SOC recognizes the low level, and determines that the motor is rotating abnormally, and outputs the corresponding command to brake and stop rotating. Among them, as shown in Table 1, H represents a high level, L represents a low level, and Z represents a high impedance state.

[0078] Figure 3 is a schematic diagram showing a DC motor working process according to an exemplary embodiment, such as Figure 3 As shown, it is applied to a projector, which includes a signal processing module, a SOC module, a motor drive IC module, a DC motor module, and a lens.

[0079] The signal processing module sends a control signal to the SOC, so that the SOC module obtains the level signal in the motor driver IC module. The motor driver IC module samples the driver IC working current and sends it to the signal processing module. The signal processing sends the sampled driver IC working current to the SOC. The SOC determines whether the DC motor is abnormal based on the sampled driver IC working current. If it is determined that the DC motor is rotating abnormally, a stop rotation signal is generated and sent to the DC motor through the motor driver IC, thereby controlling the DC motor to stop rotating and stopping the lens brake at the current position.

[0080] Figure 4 is a block diagram of a device for controlling a DC motor stall in a projector according to an exemplary embodiment. Figure 4 As shown, the device 100 includes:

[0081] A first acquisition module 110, configured to acquire an input voltage of a motor driver IC corresponding to the projector in response to detecting a change in the sampling resistance of the projector, wherein the motor driver IC is configured to drive a lens corresponding to the projector to reciprocate in a fixed direction;

[0082] A second acquisition module 120, used to acquire a reference voltage currently inputted in the same direction by a motor comparison device of the projector;

[0083] A generating module 130, configured to compare the reference voltage with the output voltage based on the motor comparison device, and if the reference voltage is greater than the input voltage, generate a low level signal and send it to the system-on-chip SOC of the projector;

[0084] The execution module 140 is used to generate a rotation abnormality signal through the SOC in response to the low-level signal, and control the projector to start a stall limit device based on the rotation abnormality signal, wherein the stall limit device is used to prevent the lens from rotating to an extreme position.

[0085] Optionally, the device 100 further includes a sending module, and the sending module is used to:

[0086] If the reference voltage is less than or equal to the input voltage, a high level signal is generated and sent to the SOC of the projector;

[0087] In response to the high level signal, a normal driving signal is generated by the SOC, and the normal driving signal is sent to a driving motor corresponding to the projector.

[0088] Through the above scheme, in response to detecting the change of the sampling resistance of the projector, the input voltage of the motor driver IC corresponding to the projector is obtained, the motor driver IC is used to drive the corresponding lens of the projector to reciprocate in a fixed direction, the reference voltage currently input in the same direction by the motor comparison device of the projector is obtained, the reference voltage and the output voltage are compared based on the motor comparison device, if the reference voltage is greater than the input voltage, a low-level signal is generated and sent to the system-on-chip SOC of the projector, a rotation abnormality signal is generated through the SOC in response to the low-level signal, and the projector is controlled to start the stall limit device based on the rotation abnormality signal, and the stall limit device is used to prevent the lens from rotating to the extreme position. Thus, the DC motor stall detection circuit is adopted to simplify the mechanical structure of the projector limit control, and the manufacturing cost of the projector is reduced under the premise of ensuring the accuracy of the stall limit control.

[0089] The present disclosure also provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the steps of the method described in any one of the aforementioned embodiments are implemented.

[0090] The present disclosure also provides an electronic device, including:

[0091] processor;

[0092] a memory for storing processor-executable instructions;

[0093] The processor is configured to execute executable instructions in the memory to implement the method described in any one of the aforementioned embodiments.

[0094] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the present disclosure. This application is intended to cover any variations, uses or adaptations of the present disclosure, which follow the general principles of the present disclosure and include common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and examples are to be considered as exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0095] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A projector DC motor stall control method, characterized in that: The method comprises: In response to detecting a change in the sampling resistance of the projector, an input voltage of a motor driver IC corresponding to the projector is obtained, wherein the motor driver IC is used to drive a lens corresponding to the projector to reciprocate in a fixed direction; Obtaining a reference voltage currently inputted in the same direction by a motor comparison device of the projector, wherein the reference voltage is related to the sampling resistor, and different sampling resistors correspond to different reference voltages; The motor comparison device compares the reference voltage with the input voltage, and if the reference voltage is greater than the input voltage, generates a low level signal and sends it to the system-on-chip (SOC) of the projector; If the reference voltage is less than or equal to the input voltage, a high level signal is generated and sent to the SOC of the projector; generating a normal driving signal through the SOC in response to the high level signal, and sending the normal driving signal to a driving motor corresponding to the projector; In response to the low level signal, a rotation abnormality signal is generated by the SOC, and based on the rotation abnormality signal, a driving motor of a corresponding lens of the projector is controlled to stop rotating.

2. A projector DC motor stall control circuit, characterized in that: The circuit includes a motor driving module, a motor comparison module, a lens driving motor, a SOC control module, a power supply module, a first sampling resistor and a second sampling resistor; The first end of the first sampling resistor is connected to the power supply module, and the second end of the first sampling resistor is connected to the power supply end of the motor driving module and the first input end of the motor comparison module; The output end of the motor driving module is connected to the input end of the lens driving motor, and the steering control end of the motor driving module is connected to the first end of the SOC control module; The power supply end of the motor comparison module is connected to the power supply module, the second input end of the motor comparison module is connected to the first end of the second sampling resistor, and the output end of the motor comparison module is connected to the SOC control module; The second end of the second sampling resistor is connected to the power module; The motor driving module is used to compare a first input voltage inputted from the first input terminal with a second input voltage inputted from the second input terminal, and output a high level signal to the SOC control module when the first input voltage is greater than or equal to the second input voltage; and output a low level signal to the SOC control module when the first input voltage is less than the second input voltage; The SOC control module is used to generate a brake command for the corresponding drive motor of the projector in response to the received low-level signal, wherein the brake command is used to control the corresponding drive motor of the projector to stop rotating; The output end of the motor driving module includes a first sub-output end and a second sub-output end, and the input end of the lens driving motor includes a first sub-input end and a second sub-output end; The motor driving module outputs a forward driving signal to the lens driving motor through the first sub-output terminal; The motor driving module outputs a reverse driving signal to the lens driving motor through the second sub-output terminal; The circuit also includes a third sampling resistor; A first end of the third sampling resistor is connected to an input end of the motor comparison module; a second end of the third sampling resistor is grounded.

3. A projector DC motor stall control device, characterized in that: The device comprises: A first acquisition module, configured to acquire an output voltage of a motor driver IC corresponding to the projector in response to detecting a change in a sampling resistance of the projector, wherein the motor driver IC is configured to drive a lens corresponding to the projector to reciprocate in a fixed direction; A second acquisition module is used to acquire a reference voltage currently inputted in the same direction by a motor comparison device of the projector, wherein the reference voltage is related to the sampling resistor, and different sampling resistors correspond to different reference voltages; A generating module, configured to compare the reference voltage with the output voltage based on the motor comparison device, and if the reference voltage is greater than the output voltage, generate a low level signal and send it to the system-on-chip (SOC) of the projector; if the reference voltage is less than or equal to the input voltage, generate a high level signal and send it to the SOC of the projector; in response to the high level signal, generate a normal driving signal through the SOC, and send the normal driving signal to the driving motor corresponding to the projector; The execution module is used to generate a rotation abnormality signal through the SOC in response to the low-level signal, and control the projector to start a blocking limit device based on the rotation abnormality signal, wherein the blocking limit device is used to prevent the lens from rotating to an extreme position.

4. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method described in claim 1 are implemented.

5. An electronic device, characterized in that: The invention comprises the projector DC motor stall control circuit as claimed in any one of claims 2.

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