Camera motor control chip and camera

Abstract

The present application is applicable to the field of camera technology, and provides a camera motor control chip and a camera. The camera motor control chip is applied to a camera, and the camera includes a main control chip, a pitch adjustment motor, a horizontal adjustment motor and an infrared switching motor. The camera motor control chip includes: a digital logic circuit, which is electrically connected to the main control chip and is used to generate a drive control signal according to a control instruction sent by the main control chip; a reference circuit, which is used to generate a reference current; and a drive circuit, which is electrically connected to the digital logic circuit, the reference circuit, the pitch adjustment motor, the horizontal adjustment motor, and the infrared switching motor, respectively, and is used to drive at least one of the pitch adjustment motor, the horizontal adjustment motor, and the infrared switching motor to work according to the reference current and the drive control signal. The camera motor control chip provided by the present application can save chip usage area.

Description

Technical Field

[0001] The present application belongs to the field of camera technology, and in particular, relates to a camera motor control chip and a camera. Background Art

[0002] With the continuous development of science and technology, the application of chips is becoming more and more extensive. In recent years, there are also a lot of applications of chips in the field of security monitoring. For example, the chip controls the motor of the camera to achieve the control of the omnidirectional movement of the camera pan / tilt, and the control of the infrared cutoff filter of the camera lens.

[0003] As the functions of cameras increase, the area of ​​the circuit board inside the camera becomes increasingly limited. Therefore, it is very important to save the area of ​​the existing chip of the camera as much as possible. The design scheme of the camera motor control chip in the traditional technology has a certain room for improvement. Summary of the invention

[0004] The present application provides a camera motor control chip and a camera, which can solve the problem of large area occupied by camera chips in traditional technologies.

[0005] In a first aspect, an embodiment of the present application provides a camera motor control chip, which is applied to a camera. The camera includes a main control chip, a pitch adjustment motor, a horizontal adjustment motor, and an infrared switching motor. The camera motor control chip includes:

[0006] A digital logic circuit, electrically connected to the main control chip, and used to generate a drive control signal according to a control instruction sent by the main control chip;

[0007] A reference circuit for generating a reference current; and

[0008] The driving circuit is electrically connected to the digital logic circuit, the reference circuit, the pitch adjustment motor, the horizontal adjustment motor, and the infrared switching motor, respectively, and is used to drive at least one of the pitch adjustment motor, the horizontal adjustment motor, and the infrared switching motor to operate according to the reference current and the driving control signal.

[0009] In one embodiment, the driving circuit includes:

[0010] A pitch adjustment control unit, electrically connected to the digital logic circuit, the reference circuit, and the pitch adjustment motor, and configured to control the pitch adjustment motor to operate according to the reference current and the pitch adjustment signal sent by the digital logic circuit;

[0011] A level adjustment control unit, electrically connected to the digital logic circuit, the reference circuit, and the level adjustment motor, and configured to control the level adjustment motor to operate according to the reference current and the level adjustment signal sent by the digital logic circuit;

[0012] The infrared switching control unit is electrically connected to the digital logic circuit, the reference circuit, and the infrared switching motor respectively, and is used to control the operation of the infrared switching motor according to the reference current and the infrared switching signal sent by the digital logic circuit.

[0013] In one embodiment, the camera motor control chip further includes:

[0014] an oscillator circuit, electrically connected to the digital logic circuit, for generating a clock signal and outputting the clock signal to the digital logic circuit;

[0015] The digital logic circuit is used to generate the driving control signal according to the clock signal and the control instruction.

[0016] In one embodiment, the reference circuit is further used to generate a reference voltage; the camera motor control chip further includes:

[0017] an undervoltage protection circuit, electrically connected to the reference circuit and the digital logic circuit, for generating an undervoltage lockout signal when the power supply voltage of the camera motor control chip is less than a preset voltage threshold, and outputting the undervoltage lockout signal to the digital logic circuit;

[0018] The digital logic circuit is further configured to control the driving circuit to not work according to the undervoltage lockout signal.

[0019] In one embodiment, the camera motor control chip further includes:

[0020] a thermal shutdown circuit, electrically connected to the reference circuit and the digital logic circuit, for generating a shutdown signal when the temperature of the camera motor control chip is higher than a preset temperature threshold, and outputting the shutdown signal to the digital logic circuit;

[0021] The digital logic circuit is further configured to control the drive circuit to shut down according to the shutdown signal.

[0022] In one embodiment, the digital logic circuit is electrically connected to the main control chip via a serial interface or a parallel interface.

[0023] In one embodiment, the camera motor control chip further includes an enable interface, a chip select interface, a clock interface and a write interface electrically connected to the digital logic circuit respectively.

[0024] In one embodiment, the camera motor control chip further includes a read interface electrically connected to the digital logic circuit.

[0025] In one embodiment, the camera motor control chip also includes a first upward movement interface, a second upward movement interface, a first downward movement interface and a second downward movement interface, which are respectively electrically connected to the pitch adjustment motor; the camera motor control chip also includes a first left movement interface, a second left movement interface, a first right movement interface and a second right movement interface, which are respectively electrically connected to the horizontal adjustment motor; the camera motor control chip also includes a first infrared switching interface and a second infrared switching interface, which are respectively electrically connected to the infrared switching motor.

[0026] In a second aspect, an embodiment of the present application provides a camera, comprising: a main control chip, a pitch adjustment motor, a horizontal adjustment motor, an infrared switching motor, and a camera motor control chip as described in any one of the first aspects.

[0027] The camera motor control chip and the camera mentioned above, the camera motor control chip includes a digital logic circuit, a reference circuit and a driving circuit. The camera motor control chip can realize the simultaneous control of the pitch adjustment motor, the horizontal adjustment motor and the infrared switching motor, and there is no need to set up multiple control chips, which saves chip costs and chip usage area, thereby saving the internal space of the camera. In addition, there is no need to set up multiple control chips, which can save the I / O interface of the main control chip, reduce design wiring, and save design and packaging costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0029] Figure 1 is a schematic diagram of the camera structure provided by an embodiment of the present application;

[0030] Figure 2 is a schematic diagram of the structure of a camera motor control chip provided in one embodiment of the present application;

[0031] Figure 3 It is a schematic diagram of the connection relationship of a camera motor control chip provided in one embodiment of the present application;

[0032] Figure 4 It is a schematic diagram of the packaging structure of a camera motor control chip provided in one embodiment of the present application;

[0033] Figure 5 is a schematic diagram of the structure of a driving circuit provided in an embodiment of the present application;

[0034] Figure 6 is a structural schematic diagram of a pitch adjustment control unit provided in an embodiment of the present application;

[0035] Figure 7 is a structural diagram of an upward control subunit provided in an embodiment of the present application;

[0036] Figure 8 is a circuit diagram of a power tube driving module provided in an embodiment of the present application;

[0037] Fig. 9 is a circuit diagram of a power tube module provided in an embodiment of the present application;

[0038] Fig.10 It is a schematic diagram of the structure of a camera motor control chip provided in another embodiment of the present application.

[0039] Description of reference numerals:

[0040] Camera 10 Main control chip 100 Camera motor control chip 200

[0041] Enable interface 201 Chip select interface 202 Clock interface 203

[0042] Write interface 204 Read interface 205 Move up first interface 2061

[0043] Move the second interface 2062 upwards Move the first interface 2063 downwards Move the second interface 2064 downwards

[0044] Move the first interface 2071 to the left. Move the second interface 2072 to the left. Move the first interface 2073 to the right.

[0045] Right shift second interface 2074 Infrared switch first interface 2081 Infrared switch second interface 2082 Digital logic circuit 210 Reference circuit 220 Driving circuit 230

[0046] Pitch adjustment control unit 231 Horizontal adjustment control unit 232 Infrared switching control unit 233

[0047] Upward control subunit 235 Power tube drive module 2351 Power tube module 2352

[0048] Downward shift control subunit 237 Oscillator circuit 240 Undervoltage protection circuit 250

[0049] Thermal shutdown circuit 260 Pan / tilt 300 Pan / tilt main body 310

[0050] Tilt adjustment motor 320 Horizontal adjustment motor 330 Lens 400

[0051] Infrared switching motor 500 Infrared cut-off filter 600 DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0053] See also Figure 1 The present application embodiment provides a camera motor control chip 200, which is applied to Figure 1 The camera 10 shown in FIG. 1 includes a main control chip (Micro Control Unit, MCU) 100 , a camera motor control chip 200 , a pan / tilt head 300 , a lens 400 , an infrared cut (IR cut) motor 500 and an infrared cut filter 600 .

[0054] The main control chip 100 is electrically connected to the camera motor control chip 200. The camera motor control chip 200 is electrically connected to the pan / tilt 300 and the infrared switching motor 500, respectively. The lens 400 is disposed on the pan / tilt 300. Optionally, the pan / tilt 300 may include a pan / tilt body 310 and a pitch adjustment motor 320 and a horizontal adjustment motor 330 that are respectively driven and connected to the pan / tilt body 310. The pitch adjustment motor 320, the horizontal adjustment motor 330 and the infrared switching motor 500 are all electrically connected to the camera motor control chip 200. The infrared cutoff filter 600 is stacked with the lens 400, and the infrared switching motor 500 is driven and connected to the infrared cutoff filter 600.

[0055] Specifically, the main control chip 100 is used to send a control instruction to the camera motor control chip 200, and the camera motor control chip 200 controls at least one of the pitch adjustment motor 320, the horizontal adjustment motor 330, and the infrared switching motor 500 according to the control instruction. The pitch adjustment motor 320 is used to drive the pan-tilt body 310 to pitch and rotate in the vertical direction, that is, to rotate up and down in the vertical direction, driving the lens 400 to pitch and rotate. The horizontal adjustment motor 330 is used to drive the pan-tilt body 310 to rotate left and right in the horizontal direction, driving the lens 400 to rotate left and right. The infrared switching motor 500 is used to drive and switch the infrared cut-off filter 600.

[0056] It can be understood that the camera 10 also includes a full spectrum filter stacked with the infrared cut-off filter 600. When the light is sufficient during the day, when the infrared switching motor 500 is not working, the infrared cut-off filter 600 is kept working to filter out the infrared. When the light is insufficient at night, the infrared switching motor 500 is controlled to work to remove the infrared cut-off filter 600, and the full spectrum filter is operated, thereby improving the low-light performance of the camera 10.

[0057] In conventional cameras, the pan / tilt 300 is controlled by a pan / tilt control chip, and the infrared cutoff filter 600 is controlled by a light switching control chip. The two chips not only occupy a large area on the camera circuit board, but also each chip requires the main control chip to provide a corresponding I / O interface to achieve communication, occupying more interfaces of the main control chip, and the wiring between the chips is complicated, increasing the design and packaging costs. In addition, conventional cameras generally have problems with jitter and excessive noise in motor drive that are difficult to solve. The camera motor control chip and camera provided in the embodiments of the present application are intended to solve the above technical problems.

[0058] The camera motor control chip and the camera provided in the embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0059] See also Figures 2 to 4 In one embodiment, the camera motor control chip 200 includes a digital logic circuit 210, a reference circuit 220 and a driving circuit 230. The digital logic circuit 210 is electrically connected to the main control chip 100 and the driving circuit respectively. The reference circuit 220 is electrically connected to the driving circuit 230. The driving circuit 230 is electrically connected to the pitch adjustment motor 320, the horizontal adjustment motor 330 and the infrared switching motor 500. It can be understood that each circuit unit of the camera motor control chip 200 is electrically connected to an external power supply (not shown), and the external power supply provides a working voltage VM.

[0060] Specifically, the output end of the main control chip 100 is connected to the input end of the digital logic circuit 210, and the output end of the digital logic circuit 210 is connected to the input end of the driving circuit 230. Optionally, the camera motor control chip 200 can be electrically connected to the main control chip 100 through a serial interface, or can be electrically connected to the main control chip 100 through a parallel interface. The digital logic circuit 210 is used to generate a driving control signal according to a control instruction sent by the main control chip 100, and send the driving control signal to the driving circuit 230. Optionally, the digital logic circuit 210 may include at least one shift register.

[0061] Optionally, the control instruction sent by the main control chip 100 may include one or more of an enable signal EN, a chip select signal CS, a clock path signal SCLK, a write signal SDI, and a read signal SDO. Correspondingly, the output interface of the camera motor control chip 200 may include one or more of an enable interface 201, a chip select interface 202, a clock interface 203, a write interface 204, and a read interface 205 connected to each input end of the digital logic circuit 210. Exemplarily, the interface setting of the camera motor control chip 200 may be as follows: Figure 4 As shown. It should be noted that, in the above interfaces, selective settings can be made according to the actual use requirements of the camera motor control chip 200 to save the I / O interface resources of the main control chip 100. Optionally, the drive control signal may include an enable signal EN<1-5>, a drive signal INA<1-5> and a drive signal INB<1-5>. Among them, EN<1-5> includes five signals EN1, EN2, EN3, EN4 and EN5 corresponding to the five functional modules of the drive circuit 230 respectively. Similarly, the drive signal INA<1-5> and the drive signal INB<1-5> also include five signals respectively.

[0062] The input end of the reference circuit 220 is electrically connected to the external power supply, and the output end of the reference circuit 220 is electrically connected to the input end of the driving circuit 230. The reference circuit 220 is used to generate the reference current IREF<1-5> required by the driving circuit 230 and input it into the driving circuit 230. IREF<1-5> may include five signals IREF1, IREF2, IREF3, IREF4 and IREF5 corresponding to the five functional modules of the driving circuit 230 respectively. The output end of the driving circuit 230 is electrically connected to the pitch adjustment motor 320, the horizontal adjustment motor 330 and the infrared switching motor 500. The driving circuit 230 is used to control at least one of the pitch adjustment motor 320, the horizontal adjustment motor 330 and the infrared switching motor 500 to work according to the reference current and the driving control signal.

[0063] The signal outputted by the driving circuit 230 to the pitch adjustment motor 320 may include the first output signal OUT1A for upward movement, the second output signal OUT1B for upward movement, the first output signal OUT2A for downward movement, and the second output signal OUT2B for downward movement. The signal outputted by the driving circuit 230 to the horizontal adjustment motor 330 may include the first output signal OUT3A for leftward movement, the second output signal OUT3B for leftward movement, the first output signal OUT4A for rightward movement, and the second output signal OUT4B for rightward movement. The signal outputted by the driving circuit 230 to the infrared switching motor 500 may include the first infrared switching signal IROA and the second infrared switching signal IROB. Correspondingly, the output interface of the camera motor control chip 200 may include a first upward movement interface 2061, a second upward movement interface 2062, a first downward movement interface 2063 and a second downward movement interface 2064 respectively connected to the pitch adjustment motor 320; a first left movement interface 2071, a second left movement interface 2072, a first right movement interface 2073 and a second right movement interface 2074 respectively connected to the horizontal adjustment motor 330; and a first infrared switching interface 2081 and a second infrared switching interface 2082 respectively connected to the infrared switching motor 500.

[0064] The working principle of the camera motor control chip 200 is as follows:

[0065] The main control chip 100 receives the operation command sent by the host computer or server, analyzes the operation command, generates a control instruction according to the analysis result, and sends the operation instruction to the digital logic circuit 210. The operation instruction is used to instruct the camera motor control chip 200 to control the lens 400 to rotate left, right, upward or downward, or to control the switching of the infrared cut-off filter 600. The digital logic circuit 210 receives the control instruction and generates a corresponding drive control signal according to the control instruction. The drive circuit 230 drives at least one of the pitch adjustment motor 320, the horizontal adjustment motor 330 or the infrared switching motor 500 to work according to the reference current provided by the reference circuit and the drive control signal sent by the digital logic circuit 210, so as to realize the upward, downward, left or right rotation of the pan / tilt body 310, drive the rotation of the lens 400; or control the operation or removal of the infrared cut-off filter 600 to control the light transmittance of the lens.

[0066] For example, when the operation command indicates "lens up", the main control chip 100 generates a corresponding control instruction according to the operation command and sends it to the digital logic circuit 210, and the digital logic circuit 210 generates a corresponding drive control signal to control the pitch adjustment motor 320 to rotate in the first direction, so as to realize that the pan / tilt body 310 rotates upward in the vertical direction, thereby driving the lens 400 to rotate upward in the vertical direction. For another example, when there is sufficient light during the day, the host computer sends an operation command for indicating "light filtering" to the main control chip 100 according to the light information detected by the sensor, and the main control chip 100 controls the infrared switching motor 500 not to work according to the operation command, and keeps the infrared cut-off filter 600 filtering out infrared. When there is insufficient light at night, the host computer sends a "light transmission" operation command to the main control chip 100 according to the light information detected by the sensor, and the camera motor control chip 200 controls the infrared switching motor 500 to work, so as to remove the infrared cut-off filter 600 and work through the full-transmittance spectrum filter.

[0067] The camera motor control chip 200 provided in this embodiment includes a digital logic circuit 210, a reference circuit 220 and a driving circuit 230. The camera motor control chip 200 can realize simultaneous control of the pitch adjustment motor 320, the horizontal adjustment motor 330 and the infrared switching motor 500, without the need to set up multiple control chips, saving chip costs and chip usage area, thereby saving the internal space of the camera 10. In addition, without setting up multiple control chips, the I / O interface of the main control chip can be saved, the design wiring is reduced, and the design and packaging costs are saved.

[0068] Figure 5 FIG. 2 is a schematic diagram of a driving circuit 230 provided in an embodiment. Figure 5 As shown, the driving circuit 230 includes a pitch adjustment control unit 231, a horizontal adjustment control unit 232, and an infrared switching control unit 233. The input ends of the pitch adjustment control unit 231, the horizontal adjustment control unit 232, and the infrared switching control unit 233 are all connected to the output end of the reference circuit 220 and the output end of the digital logic circuit 210.

[0069] Among them, the output end of the pitch adjustment control unit 231 is connected to the input end of the pitch adjustment motor 320, and the pitch adjustment control unit 231 is used to control the pitch adjustment motor 320 to work according to the reference current and the pitch adjustment signal sent by the digital logic circuit 210 to realize the pitch rotation of the gimbal body 310.

[0070] Figure 6 FIG. 2 is a schematic diagram of the structure of the pitch adjustment control unit 231 in one embodiment. Figure 6As shown, the pitch adjustment control unit 231 may further include an upward control subunit 235 and a downward control subunit 237. The upward control subunit 235 is used to drive the pitch adjustment motor 320 to generate a driving force in a first direction, so that the gimbal body 310 rotates upward in a vertical direction. The downward control subunit 237 is used to drive the pitch adjustment motor 320 to generate a driving force in a second direction, so that the gimbal body 310 rotates downward in a vertical direction. The first direction is opposite to the second direction.

[0071] For example, Figure 7 FIG. 2 shows a schematic diagram of the structure of the upward control subunit 235 in an embodiment. Figure 7 As shown, the upward control subunit 235 may include a power tube drive (GDRV) module 2351 and a power tube (DRV) module 2352. The power tube drive module 2351 is connected to the output end of the reference circuit 220. The input end of the power tube drive module 2351 is connected to the output end of the digital logic circuit 210, and the output end of the power tube drive module 2351 is connected to the input end of the power tube module 2352. The output end of the power tube module 2352 is connected to the input end of the pitch adjustment motor 320. Figure 7 As shown, the input signals of the power tube driving module 2351 include IREF1, EN1A, IN1A and IN1B. The output signals of the power tube driving module 2351 include GNA, GPA, GNB and GPB. GNA, GPA, GNB and GPB are used as input signals of the power tube module 2352, and the output signals of the power tube module 2352 include OUT1A and OUT2A.

[0072] In one embodiment, the circuit diagram of the power tube driving module 2351 can be as follows: Figure 8 As shown, the circuit diagram of the power tube module 2352 can be as follows Fig. 9 The following combination Figures 7 to 9, the input and output signals of the power tube driving module 2351 and the power tube module 2352 are further described. IREF1 is a reference current generated by the reference circuit 220, and the reference current is used to provide a bias current to the power tube driving module 2351 of the upward shift control subunit 235. EN1A is a signal output by the digital logic circuit 210 for enabling control of the output OUT1A, and EN1B is a signal input by the digital logic circuit 210 for enabling control of the output OUT1B. IN1A is a level signal output by the digital logic circuit 210 for logical control of the output OUT1A, and IN1B is a level signal output by the digital logic circuit 210 for logical control of the output OUT1B. GNA, GNB, GPA and GPB are all gate drive voltage signals generated by the power tube driving module 2351. Among them, GNA is used to supply power to the gate of the power tube NM1 in the power tube module 2352, and GNB is used to supply power to the gate of the power tube NM2 in the power tube module 2352. GPA is used to supply power to the gate of the power tube PM1 in the power tube module 2352 , and GPB is used to supply power to the gate of the power tube PM2 in the power tube module 2352 .

[0073] The structure and working principle of the downward control subunit 237 are similar to those of the upward control subunit 235, and will not be described in detail here.

[0074] The output end of the horizontal adjustment control unit 232 is connected to the input end of the horizontal adjustment motor 330. The left and right pitch adjustment control unit 232 is used to control the horizontal adjustment motor 330 to work according to the reference current and the horizontal adjustment signal sent by the digital logic circuit 210, so as to realize the left and right rotation of the pan / tilt body 310 in the horizontal direction. The working principle and circuit structure of the horizontal adjustment control unit 232 are similar to those of the pitch adjustment control unit 231, and will not be repeated here.

[0075] The output end of the infrared switching control unit 233 is connected to the input end of the infrared switching motor 500. The infrared switching control unit 233 is used to control the infrared switching motor 500 to work according to the reference current and the infrared switching signal sent by the digital logic circuit 210, so as to switch the infrared cut-off filter 600. The working principle and circuit structure of the infrared switching control unit 233 are similar to those of the pitch adjustment control unit 231, and will not be described in detail here.

[0076] It can be understood that, correspondingly, the digital logic circuit 210 may also include three shift registers, which respectively correspond to controlling the pitch adjustment control unit 231 , the horizontal adjustment control unit 232 and the infrared switching control unit 233 .

[0077] In this embodiment, the driving circuit 230 includes a pitch adjustment control unit 231, a horizontal adjustment control unit 232, and an infrared switching control unit 233. By providing a separate control unit, the pitch adjustment motor 320, the horizontal adjustment motor 330, and the infrared switching motor 500 are independently controlled, so that the circuit design is simple and flexible.

[0078] Fig.10 FIG. 2 is a schematic diagram of the structure of a camera motor control chip 200 in another embodiment. Fig. 9 As shown, the camera motor control chip 200 may further include an oscillator circuit 240 , an undervoltage protection circuit 250 , and a thermal shutdown circuit 260 .

[0079] The output end of the oscillator circuit 240 is connected to the input end of the digital logic circuit 210. The oscillator circuit is used to generate a clock signal CLK and output the clock signal CLK to the digital logic circuit 210. The digital logic circuit 210 generates a driving control signal according to the clock signal CLK and the control instruction sent by the main control chip 100.

[0080] The camera motor control chip 200 provided in this embodiment prevents the external environment from interfering with the oscillator circuit 240 by building the oscillator circuit 240 into the chip, making the oscillation frequency of the oscillator more stable, thereby solving the noise and jitter problems commonly existing in the control chip when driving the motor.

[0081] In one embodiment, the reference circuit 220 is also used to generate a reference voltage VREF. The undervoltage protection circuit 250 and the thermal shutdown circuit 260 are both electrically connected to the reference circuit 220, and the reference circuit 220 provides the undervoltage protection circuit 250 and the thermal shutdown circuit 260 with the reference voltage VREF required for operation. When the external power supply voltage VM of the camera motor control chip 200 is less than the preset voltage threshold, the undervoltage protection circuit 250 generates an undervoltage lockout signal UVLO_OK and outputs the undervoltage lockout signal UVLO_OK to the digital logic circuit 210. The digital logic circuit 210 outputs a non-operating signal to the drive circuit 230 according to the undervoltage lockout signal UVLO_OK, the drive circuit 230 does not operate, and the chip enters the undervoltage protection mode. When the external power supply voltage VM is greater than or equal to the preset voltage threshold, the undervoltage protection circuit 250 outputs an exit undervoltage lockout signal to the digital logic circuit 210, and the digital logic circuit 210 controls the drive circuit to exit the undervoltage protection mode and start working. In this embodiment, by providing an undervoltage protection circuit 250, the chip is protected from working in an undervoltage condition, thereby effectively protecting the chip circuit and improving the safety and stability of the chip.

[0082] The output end of the thermal shutdown circuit 260 is connected to the input end of the digital logic circuit 210. The thermal shutdown circuit 260 is used to generate a shutdown signal when the temperature of the camera motor control chip 200 is higher than a preset temperature threshold, and output the shutdown signal TS_OK to the digital logic circuit 210. The digital logic circuit 210 controls the driving circuit 230 to shut down according to the shutdown signal TS_OK. In this embodiment, the chip is shut down when the temperature is too high through the thermal shutdown circuit 260, which prevents the chip from overheating, effectively protects the chip circuit, and further improves the stability and reliability of the chip.

[0083] In one embodiment, the output end of the digital logic circuit 210 is also connected to the enable end of the oscillator circuit 240, the undervoltage protection circuit 250, the thermal shutdown circuit 260 and the reference circuit 220. When the main control chip 100 sends a low power instruction to the digital logic circuit 210, the digital logic circuit 210 sends an enable signal EN0 to the undervoltage protection circuit 250, the thermal shutdown circuit 260 and the reference circuit 220, turns off the undervoltage protection circuit 250, the thermal shutdown circuit 260 and the reference circuit 220, and sends an enable signal EN1 to the oscillator circuit 240 to turn off the oscillator circuit 240, so that the entire camera motor control chip 200 enters a low power mode, thereby reducing chip energy consumption and saving electricity.

[0084] An embodiment of the present application further provides a camera 10, such as Figure 1 As shown, the camera 10 includes a main control chip 100, a pitch adjustment motor 320, a horizontal adjustment motor 330, an infrared switching motor 500, and a camera motor control chip 200 as described in any of the above embodiments. The structure, working principle and beneficial effects of the camera 10 refer to the above embodiments and will not be repeated here.

[0085] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A camera motor control chip, characterized in that: Applied to a camera, the camera includes a main control chip, a pitch adjustment motor, a horizontal adjustment motor and an infrared switching motor, and the camera motor control chip includes: A digital logic circuit, electrically connected to the main control chip, and used to generate a drive control signal according to a control instruction sent by the main control chip; A reference circuit for generating a reference current; and The driving circuit is electrically connected to the digital logic circuit, the reference circuit, the pitch adjustment motor, the horizontal adjustment motor, and the infrared switching motor, respectively, and is used to drive at least one of the pitch adjustment motor, the horizontal adjustment motor, and the infrared switching motor to operate according to the reference current and the driving control signal.

2. The camera motor control chip according to claim 1, characterized in that: The driving circuit comprises: A pitch adjustment control unit, electrically connected to the digital logic circuit, the reference circuit, and the pitch adjustment motor, and configured to control the pitch adjustment motor to operate according to the reference current and the pitch adjustment signal sent by the digital logic circuit; A level adjustment control unit, electrically connected to the digital logic circuit, the reference circuit, and the level adjustment motor, and configured to control the level adjustment motor to operate according to the reference current and the level adjustment signal sent by the digital logic circuit; The infrared switching control unit is electrically connected to the digital logic circuit, the reference circuit, and the infrared switching motor respectively, and is used to control the operation of the infrared switching motor according to the reference current and the infrared switching signal sent by the digital logic circuit.

3. The camera motor control chip according to claim 1, characterized in that: The camera motor control chip also includes: an oscillator circuit, electrically connected to the digital logic circuit, for generating a clock signal and outputting the clock signal to the digital logic circuit; The digital logic circuit is used to generate the driving control signal according to the clock signal and the control instruction.

4. The camera motor control chip according to claim 1, characterized in that: The reference circuit is also used to generate a reference voltage; the camera motor control chip also includes: an undervoltage protection circuit, electrically connected to the reference circuit and the digital logic circuit, for generating an undervoltage lockout signal when the power supply voltage of the camera motor control chip is less than a preset voltage threshold, and outputting the undervoltage lockout signal to the digital logic circuit; The digital logic circuit is further configured to control the driving circuit to not work according to the undervoltage lockout signal.

5. The camera motor control chip according to claim 4, characterized in that: The camera motor control chip also includes: a thermal shutdown circuit, electrically connected to the reference circuit and the digital logic circuit, for generating a shutdown signal when the temperature of the camera motor control chip is higher than a preset temperature threshold, and outputting the shutdown signal to the digital logic circuit; The digital logic circuit is further configured to control the drive circuit to shut down according to the shutdown signal.

6. The camera motor control chip according to claim 1, characterized in that: The digital logic circuit is electrically connected to the main control chip via a serial interface or a parallel interface.

7. The camera motor control chip according to any one of claims 1 to 6, characterized in that: The camera motor control chip also includes an enable interface, a chip select interface, a clock interface and a write interface which are electrically connected to the digital logic circuit respectively.

8. The camera motor control chip according to claim 7, characterized in that: The camera motor control chip also includes a read interface electrically connected to the digital logic circuit.

9. The camera motor control chip according to any one of claims 1 to 6, characterized in that: The camera motor control chip also includes a first upward movement interface, a second upward movement interface, a first downward movement interface and a second downward movement interface, which are respectively electrically connected to the pitch adjustment motor; the camera motor control chip also includes a first left movement interface, a second left movement interface, a first right movement interface and a second right movement interface, which are respectively electrically connected to the horizontal adjustment motor; the camera motor control chip also includes a first infrared switching interface and a second infrared switching interface, which are respectively electrically connected to the infrared switching motor.

10. A camera, characterized in that: include: A main control chip, a pitch adjustment motor, a horizontal adjustment motor, an infrared switching motor, and a camera motor control chip as described in any one of claims 1 to 9.

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