Driving apparatus, image collection module and voltage adjustment method

Abstract

The embodiments of the present application provide a driving apparatus, an image collection module and a voltage adjustment method. The driving apparatus, which is used for driving a motor of an image collection apparatus, comprises a control module, a driving module and a voltage adjustment unit, wherein the control module is used for acquiring displacement information of an image collection apparatus, sending a driving current instruction to the driving module on the basis of the displacement information, and sending a voltage adjustment signal to the voltage adjustment unit on the basis of the displacement information; the driving module is used for generating a driving current on the basis of the driving current instruction; and the voltage adjustment unit is used for adjusting, on the basis of the voltage adjustment signal, a voltage that is input by a power supply to a driving voltage matching the driving current, and transmitting the driving voltage to the driving module, such that the driving module drives a motor by means of the driving current and the driving voltage. In the present application, by generating a voltage adjustment signal for enabling a voltage adjustment unit to adjust a voltage that is input by a power supply to a driving voltage matching a driving current, the voltage adjustment unit controls the input voltage on the basis of the power required for driving a motor, thereby improving the energy efficiency ratio.

Description

Drive unit, image acquisition module and voltage adjustment method

[0001] This application claims priority to Chinese Patent Application No. 202410503100.X, filed on April 24, 2024, entitled “Driving Device, Image Acquisition Module and Voltage Adjustment Method”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of optical lens driving technology, and in particular to a driving device, an image acquisition module, and a voltage adjustment method. Background Technology

[0003] Currently, most camera modules in portable electronic devices such as mobile phones and tablets on the market use autofocus systems and optical image stabilization systems (also known as optical image stabilization) to achieve image stabilization. After determining the amount of displacement for focusing or shaking, autofocus and optical image stabilization camera modules drive the camera motor to produce displacement, thereby achieving focus or compensating for shaking.

[0004] Currently, there are two main ways to drive camera motors. One is to change the motor's drive current without changing the drive voltage to move the camera. However, this method has high power consumption and low energy efficiency. The other method is to use pulse width modulation (PWM) to coordinate the change of drive voltage and frequency to drive the motor. However, PWM introduces significant noise, resulting in poor drive accuracy. Summary of the Invention

[0005] In view of this, embodiments of this application provide a driving device, an image acquisition module, and a voltage adjustment method to at least partially solve the above-mentioned problems.

[0006] According to a first aspect of the present application, a driving device is provided for driving a motor of an image acquisition device. The driving device includes: a control module, a driving module, and a voltage regulation unit. The control module is configured to acquire displacement information of the image acquisition device, send a driving current command to the driving module according to the displacement information, and send a voltage regulation signal to the voltage regulation unit according to the displacement information. The driving module is configured to generate a driving current according to the driving current command. The voltage regulation unit is configured to adjust the voltage of the power supply input to a driving voltage that matches the driving current according to the voltage regulation signal, and transmit the driving voltage to the driving module so that the driving module drives the motor through the driving current and the driving voltage.

[0007] In one possible implementation, the control module is configured to generate a voltage regulation command based on the displacement information, wherein the voltage regulation command is used to generate the voltage regulation signal.

[0008] In one possible implementation, the driving device further includes a digital-to-analog converter module; the control module is used to send the voltage regulation command to the digital-to-analog converter module; the digital-to-analog converter module is used to generate the voltage regulation signal according to the voltage regulation command, and send the voltage regulation signal to the voltage regulation unit, so that the voltage regulation unit adjusts the voltage value of the input voltage of the power supply to the voltage value indicated by the voltage regulation signal.

[0009] In one possible implementation, the voltage regulating unit is configured to adjust the voltage value of the input voltage of the power supply to the voltage value indicated by the voltage regulating signal according to the voltage regulating signal.

[0010] In one possible implementation, the control module is configured to determine a first focus code and a second focus code based on the displacement information, and generate the voltage adjustment command based on the first focus code and the second focus code, wherein the first drive current corresponding to the first focus code is used to drive the motor to move the image acquisition device in the optical axis direction, and the second drive current corresponding to the second focus code is used to drive the motor to move the image acquisition device in the direction perpendicular to the optical axis.

[0011] In one possible implementation, the power supply supplies power to the control module through the power supply interface of the control module.

[0012] In one possible implementation, the voltage regulating unit supplies power to the control module through the power supply interface of the control module.

[0013] According to a second aspect of the embodiments of this application, an image acquisition module is provided, including a driving device, a displacement information generation device, a motor, and an image acquisition device as described in any one of the first aspects of the embodiments; the displacement information generation device is used to generate displacement information based on the displacement generated by the image acquisition device, and send the displacement information to the driving device; the motor, after being driven by the driving device, drives the image acquisition device to generate displacement.

[0014] In one possible implementation, the displacement information generating device includes a host computer or a gyroscope sensor; the host computer is used to generate displacement information of the image acquisition device based on multiple images acquired by the image acquisition device; the gyroscope sensor is used to convert the motion information of the image acquisition device into angular quantities and generate displacement information of the image acquisition device based on the angular quantities, wherein the motion information of the image acquisition device includes at least the angular velocity and acceleration of the image acquisition device.

[0015] According to a third aspect of the embodiments of this application, a voltage adjustment method is provided, comprising: acquiring displacement information of an image acquisition device; generating a drive current command and a voltage regulation signal based on the displacement information; generating a drive current based on the drive current command; adjusting the voltage of a power input based on the voltage regulation signal to obtain a drive voltage; and driving a motor based on the drive current and the drive voltage, wherein the drive voltage is matched with the drive current, and the motor is used to drive the image acquisition device.

[0016] In one possible implementation, the process of generating a voltage regulation signal based on the displacement information may further include: generating a voltage regulation command based on the displacement information, and generating the voltage regulation signal based on the voltage regulation command.

[0017] In one possible implementation, the process of generating the voltage regulation signal according to the voltage regulation command may further include: performing digital-to-analog conversion on the voltage regulation command to obtain the voltage regulation signal.

[0018] In one possible implementation, the process of generating the voltage regulation signal according to the voltage regulation command may further include: determining the voltage regulation command as the voltage regulation signal.

[0019] In one possible implementation, the process of generating a voltage regulation signal based on the displacement information may further include: determining a first driving current and a second driving current based on the displacement information; generating the voltage regulation command based on the maximum value of the first driving current and the second driving current, wherein the first driving current is used to drive the motor to move the image acquisition device in the optical axis direction, and the second driving current is used to drive the motor to move the image acquisition device in the direction perpendicular to the optical axis.

[0020] In one possible implementation, the process of generating a voltage adjustment signal based on the displacement information may further include: determining a first focus code and a second focus code based on the displacement information; generating the voltage adjustment command based on the first focus code and the second focus code, wherein the first driving current corresponding to the first focus code is used to drive the motor to move the image acquisition device in the optical axis direction, and the second driving current corresponding to the second focus code is used to drive the motor to move the image acquisition device in the direction perpendicular to the optical axis.

[0021] As can be seen from the above technical solution, by generating a drive current command based on the displacement information of the image acquisition device by the control module, and then generating a voltage regulation signal to enable the voltage regulation unit to adjust the voltage of the power input to match the drive current, the voltage regulation unit can control the voltage of the power input according to the actual power required by the drive module to drive the motor, thereby reducing power consumption and improving energy efficiency ratio. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings.

[0023] Figure 1 is a schematic diagram of an exemplary scenario provided in an embodiment of this application;

[0024] Figure 2 is a schematic diagram of a driving device provided in an embodiment of this application;

[0025] Figure 3 is a schematic diagram of another driving device provided in an embodiment of this application;

[0026] Figure 4 is a schematic diagram of a drive device including a motor control chip provided in an embodiment of this application;

[0027] Figure 5 is a schematic diagram of a driving device applicable to an embodiment of this application;

[0028] Figure 6 is a schematic diagram of another driving device including a motor control chip provided in an embodiment of this application;

[0029] Figure 7 is a schematic diagram of another driving device applicable to an embodiment of this application;

[0030] Figure 8 is a schematic diagram of an image acquisition module provided in an embodiment of this application;

[0031] Figure 9 is a flowchart of a voltage adjustment method provided in an embodiment of this application. Detailed Implementation

[0032] To enable those skilled in the art to better understand the technical solutions in the embodiments of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art should fall within the protection scope of the embodiments of this application.

[0033] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0034] It should be understood that although the terms first, second, third, etc., may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0035] Figure 1 is a schematic diagram of an exemplary scenario provided by an embodiment of this application. As shown in Figure 1, the exemplary scenario is the automatic optical focus or optical image stabilization (also known as optical image stabilization) solution currently used in portable electronic devices such as mobile phones and tablets on the market. In this exemplary scenario, when the camera moves, the automatic focus and / or optical image stabilization camera module will determine the focus or shaking displacement information, and then input the displacement information into the microcontroller unit (MCU). The microcontroller unit outputs drive information to the camera motor control chip. The camera motor control chip uses a fixed drive voltage provided by an external power supply as its working voltage, and generates a drive current according to the drive information. Then, it drives the camera motor to run according to the drive current and drive voltage. When the camera motor is running, it will drive the camera connected to it to move, so as to achieve automatic optical focus or optical image stabilization.

[0036] However, in the exemplary scenario, when the camera motor drives the camera to produce displacement, the driving current of the camera motor is linearly related to the amount of displacement. But most of the time the focusing displacement or jitter is small, so the amount of displacement required by the camera motor to drive the camera is small, and the required driving current and driving voltage are relatively small. However, the driving voltage input by the external power supply is a constant high voltage, which exceeds the voltage range required by the camera motor, thus increasing power consumption and making the energy efficiency relatively low.

[0037] To address the low energy efficiency issue in the exemplary scenario, current solutions employ pulse width modulation (PWM) to coordinate the drive voltage according to the load on the camera motor, thereby reducing the power consumption for driving the camera's displacement and improving energy efficiency. However, PWM introduces significant noise, leading to reduced drive accuracy.

[0038] Therefore, this application proposes a driving device, an image acquisition module, and a voltage adjustment method to solve the above problems.

[0039] Example 1

[0040] Figure 2 is a schematic diagram of a driving device provided in an embodiment of this application. As shown in Figure 2, the driving device 100 for driving the motor 300 of the image acquisition device 200 includes: a control module 101, a driving module 102, and a voltage regulating unit 103. The control module 101 is used to acquire displacement information of the image acquisition device 200, send a driving current command to the driving module according to the displacement information, and send a voltage regulating signal to the voltage regulating unit 103 according to the displacement information. The driving module 102 is used to generate a driving current according to the driving current command. The voltage regulating unit 103 is used to adjust the voltage input from the power supply 400 to a driving voltage that matches the driving current according to the voltage regulating signal, and transmit the driving voltage to the driving module 102, so that the driving module 102 drives the motor 300 through the driving current and driving voltage.

[0041] To control the drive voltage, the control module 101 first acquires the displacement information of the image acquisition device 200. The image acquisition device 200 can be a camera or other device used for image acquisition. The displacement information can be generated by a host computer based on multiple images acquired by the image acquisition device 200, or it can be generated by a gyroscope sensor based on data from the displacement of the image acquisition device 200. The control module 101 then generates a drive current command and a voltage regulation signal based on the acquired displacement information. In one possible implementation, the control module 101 can also generate a voltage regulation command based on the displacement information, which is used to generate the voltage regulation signal. The control module 101 sends a drive current command to the drive module 102. The drive current command indicates the drive current required for the motor 300 to drive the image acquisition device 200 to generate a displacement relative to the displacement information. The control module 101 also sends a voltage regulation signal to the voltage regulation unit 103. The voltage regulation unit 103 can be a high-efficiency power management chip such as a switching power supply or a DC-to-DC converter (DCDC) power chip. The voltage regulation unit 103 will adjust the voltage input to the power supply 400 to a drive voltage that matches the drive current according to the received voltage regulation signal. Then, the drive voltage will be transmitted to the drive module 102. The drive module 102 will then drive the motor 300 through the drive current and drive voltage. After being driven, the motor 300 will drive the image acquisition device 200 to generate a corresponding displacement to achieve autofocus and / or optical image stabilization.

[0042] In this embodiment, the control module 101 generates a drive current command based on the displacement information of the image acquisition device 200, and then generates a voltage regulation signal to make the voltage regulation unit 103 adjust the voltage input of the power supply 400 to match the drive current. This enables the voltage regulation unit 103 to control the voltage input of the power supply 400 according to the power required by the drive module 102 to actually drive the motor 300, thereby reducing power consumption and improving energy efficiency.

[0043] Example 2

[0044] Based on Embodiment 1, the control module 101 can be used to determine the first driving current and the second driving current according to the displacement information, and generate a voltage regulation command according to the maximum value of the first driving current and the second driving current. The first driving current is used to drive the motor 300 to drive the image acquisition device 200 to move in the optical axis direction, and the second driving current is used to drive the motor 300 to drive the image acquisition device 200 to move in the direction perpendicular to the optical axis.

[0045] Any displacement generated by the image acquisition device 200 can be decomposed into the sum of the displacement generated by movement in the optical axis direction and the displacement generated by movement in the direction perpendicular to the optical axis. The motor 300 needs to drive the image acquisition device 200 to counteract the displacement generated by it. Therefore, it is first necessary to calculate the first driving current ix_driver required by the motor 300 to drive the image acquisition device 200 in the optical axis direction, and the second driving current iy_driver required by the motor 300 to drive the image acquisition device 200 in the direction perpendicular to the optical axis. Since the first driving current ix_driver and the second driving current iy_driver required to drive the image acquisition device 200 may differ, the driving power required by the motor 300 needs to be based on the maximum value of the driving power in both directions; that is, the maximum value between ix_driver and iy_driver is selected to generate the voltage regulation command.

[0046] It should be noted that the displacement generated by the image acquisition device 200 may be very small, resulting in very small calculated ix_driver and iy_driver, which in turn leads to a smaller calculated required driving voltage. In this case, the normal operating voltage of the motor 300 needs to be referenced. When the required driving voltage is less than the normal operating voltage of the motor 300, the normal operating voltage of the motor 300 is used as the required driving voltage, and the control module 101 generates a voltage adjustment command based on the normal operating voltage of the motor 300.

[0047] In this embodiment, the control module 101 generates a voltage regulation command based on the first drive current and the second drive current, which ultimately enables a more precise drive voltage supply to the motor 300, further improving the energy efficiency ratio. Simultaneously, when the drive voltage required by the motor 300 is low, a voltage regulation command can be generated based on the normal operating voltage of the motor 300 to ensure the normal operation of the motor 300.

[0048] Example 3

[0049] Based on Embodiment 1, the control module 101 can be used to determine the first focus code and the second focus code according to the displacement information, and generate a voltage adjustment command according to the first focus code and the second focus code. The first drive current corresponding to the first focus code is used to drive the motor 300 to drive the image acquisition device 200 to move in the optical axis direction, and the second drive current corresponding to the second focus code is used to drive the motor 300 to drive the image acquisition device 200 to move in the direction perpendicular to the optical axis.

[0050] The control module 101 can generate voltage adjustment commands not only based on the drive current but also based on the focus code. Specifically, when the control module 101 generates the voltage adjustment command, it first needs to calculate the drive current ix_driver required for the motor 300 to drive the image acquisition device 200 to move in the optical axis direction, and the drive current iy_driver required for the motor 300 to drive the image acquisition device 200 to move in the direction perpendicular to the optical axis. Then, it determines the first focus code and the second focus code corresponding to ix_driver and iy_driver, determines the N-bit focus code based on the first and second focus codes, and generates the voltage adjustment command based on the N-bit focus code. Here, N is a positive integer.

[0051] In this embodiment, the control module 101 generates a voltage adjustment command based on the first focus code and the second focus code, which ultimately enables more precise driving voltage to the motor 300, further improving the energy efficiency ratio.

[0052] Example 4

[0053] Based on any of the embodiments in Embodiments 1-3, as shown in FIG3, the driving device 100 further includes a digital-to-analog conversion module 104.

[0054] The control module 101 is used to send a voltage regulation command to the digital-to-analog converter module 104. The digital-to-analog converter module 104 is used to generate a voltage regulation signal according to the voltage regulation command and send the voltage regulation signal to the voltage regulation unit 103, so that the voltage regulation unit 103 adjusts the voltage value of the input voltage of the power supply 400 to the voltage value indicated by the voltage regulation signal.

[0055] During autofocus or optical image stabilization, the control module 101 first acquires the displacement information of the image acquisition device 200. Then, it generates a drive current command based on the displacement information and sends it to the drive module 102. The drive current command indicates the current required for the motor 300 to drive the image acquisition device 200 to produce a displacement relative to the displacement information. Simultaneously, the control module 101 sends a voltage adjustment command to the digital-to-analog converter module 104 based on the displacement information. The digital-to-analog converter module 104 generates a voltage adjustment signal based on the voltage adjustment command and sends it to the voltage adjustment unit 103. For example, the voltage adjustment signal can be an analog voltage, which matches the drive current indicated by the drive current command. The voltage adjustment unit 103 adjusts the voltage input from the power supply 400 to a drive voltage that matches the drive current indicated by the drive current command, and transmits the drive voltage to the drive module 102. The drive module 102 generates a drive current based on the drive current command, and then drives the motor 300 using the drive current and drive voltage, causing the motor 300 to drive the image acquisition device 200 to produce a displacement relative to the displacement information.

[0056] By providing a digital-to-analog converter module 104 in the drive device 100, this application enables the voltage regulating unit 103 to adjust the voltage input to the power supply 400 without having a digital-to-analog conversion function, thereby improving the voltage regulation efficiency of the voltage regulating unit 103.

[0057] Example 5

[0058] Based on any of the embodiments in Embodiments 1-3, the voltage regulating unit 103 can be used to adjust the voltage value of the input voltage of the power supply 400 to the voltage value indicated by the voltage regulating signal according to the voltage regulating signal.

[0059] The voltage regulation unit 103 can be a high-efficiency power management chip with digital communication function, such as a DC-to-DC converter (DCDC) power chip with digital communication function. Therefore, it can directly adjust the voltage input to the power supply 400 according to the voltage regulation signal. Specifically, the voltage regulation unit 103 can adjust the voltage input to the power supply 400 to a driving voltage that matches the driving current indicated by the driving current command according to the analog voltage.

[0060] In this embodiment, since the voltage regulating unit 103 can directly adjust the voltage input to the power supply 400 according to the voltage regulating signal, the data processing pressure of the control module 101 is reduced, thereby improving the processing efficiency of the control module 101.

[0061] Example 6

[0062] Based on any of the embodiments in Examples 1-5, as shown in Figure 4, the control module 101 and drive module 102 in the drive device 100 can be housed in the motor control chip 110, and the voltage regulating unit 103 can be externally connected to the motor control chip. The control module 101 and drive module 102 are set up separately from the voltage regulating unit 103.

[0063] In this embodiment, since the voltage regulating unit 103 is a unit that adjusts the voltage input to the power supply 400, it generates significant heat during operation and has a high temperature. By not integrating the control module 101 and drive module 102 with the voltage regulating unit 103, the motor control chip 110 is not affected by the heat generated by the voltage regulating unit 103, thus reducing the operating temperature of the motor control chip 110 and improving its operating accuracy. Furthermore, when constructing the image acquisition module, since the motor control chip 110 and the voltage regulating unit 103 are not integrated, the voltage regulating unit 103 can be selectively placed inside or outside the image acquisition module as needed. Placing the voltage regulating unit 103 outside the image acquisition module reduces the physical area occupied by the constructed image acquisition module.

[0064] For example, as shown in Figure 5, the control module 101 can be a microcontroller unit (MCU), the drive module 102 can be an H-DRIVER driver, and the voltage regulation unit 103 can be a DC-DC converter with digital communication function. The MCU and H-DRIVER are set in the motor control chip 110. The MCU sends a voltage regulation signal to the DC-DC converter. At this time, the voltage regulation signal is a voltage regulation command. Then, the DC-DC converter adjusts the voltage VCC input by the power management unit (PMU) to the drive voltage according to the voltage regulation command. Then, the H-DRIVER generates a drive current according to the drive current command sent by the MCU. The H-DRIVER drives the motor according to the drive current and drive voltage.

[0065] Example 7

[0066] Based on any of the embodiments in Embodiments 1-5, as shown in FIG6, the drive device 100 may include a motor control chip 120, and the control module 101, drive module 102 and voltage regulating unit 103 are integrated inside the motor control chip 120. The control module 101, drive module 102 and voltage regulating unit 103 are integrated.

[0067] In this embodiment of the application, when the control module 101, drive module 102 and voltage regulation unit 103 are integrated, the voltage regulation unit 103 will occupy off-chip communication resources when placed outside the motor control chip 120, increasing packaging costs and peripheral circuit area, thereby increasing application complexity. Therefore, the integrated setup releases off-chip communication resources, reduces packaging costs, reduces peripheral circuit area, and thus reduces application complexity.

[0068] For example, as shown in Figure 7, the control module 101 can be a microcontroller unit (MCU), the drive module 102 can be an H-DRIVER driver, and the voltage regulation unit 103 can be a DC-DC converter without digital communication function. The MCU, H-DRIVER, and DC-DC are all set in the motor control chip 120. Since the DC-DC converter does not have digital communication function, it cannot recognize the voltage regulation command sent by the MCU. Therefore, a digital-to-analog converter (DAC) module 104 can also be set in the motor control chip 120. The DAC converts the voltage regulation command sent by the MCU into an analog voltage, determines the analog voltage as a voltage regulation signal, and sends it to the DC-DC converter. Then, the DC-DC converter adjusts the voltage VCC input by the power management unit (PMU) to the drive voltage indicated by the analog voltage according to the analog voltage. Then, the H-DRIVER generates a drive current according to the drive current command sent by the MCU. The H-DRIVER drives the motor according to the drive current and drive voltage.

[0069] Example 8

[0070] Based on any of the embodiments in Embodiments 1-7, the power supply 400 can supply power to the control module 101 through the power supply interface of the control module 101.

[0071] When the voltage regulating unit 103 transmits the driving voltage to the driving module 102 to power the driving module 102, the operating voltage of the control module 101 can be provided by the power supply 400, which is suitable for dual power supply scenarios. For example, when the control module 101 is an integrated optical image stabilization (OIS) control driver chip, the power supply 400 supplies power to the integrated OIS control driver chip through the power supply interface of the integrated OIS control driver chip.

[0072] In this embodiment, the control module 101 is powered by the power supply 400, which is applicable to dual power supply scenarios.

[0073] Example 9

[0074] Based on any of the embodiments in Embodiments 1-7, the voltage regulating unit 103 can supply power to the control module 101 through the power supply interface of the control module 101.

[0075] The operating voltage of the control module 101 can be provided by the voltage regulating unit 103, which is suitable for single power supply scenarios. For example, when the control module 101 is a discrete optical image stabilization (OIS) control driver chip or an open-loop / closed-loop autofocus (AF) camera motor control chip, the power supply interface of the voltage regulating unit 103 supplies power to it.

[0076] It should be noted that when the operating voltage of the control module 101 is provided by the voltage regulating unit 103, the driving current generated by the control module 101 includes the current of the drive motor 300 and the current that drives the control module 101 to operate. At this time, the driving voltage adjusted by the voltage regulating unit 103 includes the voltage of the drive motor 300 and the voltage that drives the control module 101 to operate.

[0077] In this embodiment, the control module 101 is powered by the voltage regulating unit 103, which is applicable to single power supply scenarios.

[0078] Example 10

[0079] Figure 8 is a schematic diagram of an image acquisition module provided in an embodiment of this application. As shown in Figure 8, the image acquisition module 500 includes: a displacement information generation device 501, a driving device 100 as described in any of the above embodiments, a motor 300, and an image acquisition device 200. The displacement information generation device 501 is used to generate displacement information based on the displacement generated by the image acquisition device 200 and send the displacement information to the driving device 100. After being driven by the driving device 100, the motor 300 drives the image acquisition device 200 to generate displacement.

[0080] The displacement information generation device 501 can be a host computer or a gyroscope sensor. When the displacement information generation device 501 is a host computer, it generates displacement information of the image acquisition device 200 based on multiple images acquired by the image acquisition device 200. Specifically, the displacement information can be obtained by comparing the offset values ​​of feature points in the multiple images. When the displacement information generation device 501 is a gyroscope sensor, it generates displacement information of the image acquisition device based on the motion data of the image acquisition device. The motion information of the image acquisition device can include the angular velocity and acceleration of the image acquisition device. A gyroscope sensor is a motion sensor. Commonly used gyroscope sensors include three-axis gyroscope sensors and six-axis gyroscope sensors. A three-axis gyroscope sensor can detect angular velocity in three directions, while a six-axis gyroscope sensor adds acceleration measuring devices in three directions to the three-axis gyroscope sensor, enabling the detection of acceleration in three directions. To reduce costs, a three-axis gyroscope sensor can be selected. To improve the accuracy of displacement information acquisition by the image acquisition device 200, a six-axis gyroscope sensor can be selected, which can more comprehensively reflect the motion state and attitude of the image acquisition device 200.

[0081] In this embodiment, the drive device 100 generates a drive current based on the displacement information generated by the displacement information generating device 501, and then controls the voltage input to the power supply 400 according to the power required by the actual drive motor 300, thereby reducing power consumption and improving energy efficiency ratio.

[0082] Example 11

[0083] Figure 9 is a flowchart of a voltage adjustment method provided in an embodiment of this application. As shown in Figure 9, the voltage adjustment method includes the following steps:

[0084] Step 801: Obtain the displacement information of the image acquisition device.

[0085] In order to control the driving voltage, the displacement information of the image acquisition device is first obtained. The image acquisition device can be a camera or other device used to acquire images. The displacement information of the image acquisition device can be generated by the host computer based on multiple images acquired by the image acquisition device, or it can be generated by the gyroscope sensor based on the data when the image acquisition device generates displacement.

[0086] Step 802: Generate drive current command and voltage regulation signal based on displacement information.

[0087] Specifically, the process of generating a voltage regulation signal based on a voltage regulation command may also include:

[0088] A voltage regulation command is generated based on the displacement information, and a voltage regulation signal is generated based on the voltage regulation command.

[0089] Step 803: Generate drive current according to drive current command.

[0090] Step 804: Adjust the voltage of the power input according to the voltage regulation signal to obtain the driving voltage.

[0091] Step 805: Drive the motor according to the drive current and drive voltage.

[0092] Based on the acquired displacement information, the required drive current and voltage regulation signal are generated. The voltage of the power input is adjusted to match the drive current, and the motor is driven by the drive current and drive voltage. After being driven, the motor will drive the image acquisition device to produce corresponding displacement, so as to achieve autofocus and / or optical image stabilization.

[0093] In this embodiment, a drive current command is generated based on the displacement information of the image acquisition device, and then a drive current and a voltage regulation signal are generated to adjust the voltage of the power input to match the drive current. This allows the power input voltage to be controlled according to the actual power required by the drive motor, thereby reducing power consumption and improving energy efficiency.

[0094] Example 12

[0095] Based on Example 11, the process of generating a voltage regulation signal according to a voltage regulation command may further include:

[0096] The voltage regulation command is converted from digital to analog to obtain the voltage regulation signal.

[0097] In this embodiment, by performing digital-to-analog conversion on the voltage regulation command, the analog voltage can be used as the voltage regulation signal for adjustment during voltage regulation, thereby improving the voltage regulation efficiency.

[0098] Example 13

[0099] Based on Example 11, the process of generating a voltage regulation signal according to a voltage regulation command may further include:

[0100] The voltage regulation command is defined as the voltage regulation signal.

[0101] In this embodiment of the application, by directly determining the voltage regulation command as the voltage regulation signal, the efficiency of generating the voltage regulation signal can be improved.

[0102] Example 14

[0103] Based on Example 11, the process of generating a voltage regulation signal according to displacement information may further include:

[0104] The first driving current and the second driving current are determined based on the displacement information, and a voltage regulation command is generated based on the maximum value of the first driving current and the second driving current.

[0105] Any displacement generated by the image acquisition device can be decomposed into the sum of the displacement generated by movement along the optical axis and the displacement generated by movement perpendicular to the optical axis. The motor needs to drive the image acquisition device to counteract this displacement. Therefore, it is first necessary to calculate the first driving current ix_driver required for the motor to drive the image acquisition device along the optical axis, and the second driving current iy_driver required for the motor to drive the image acquisition device perpendicular to the optical axis. Since the first driving current ix_driver and the second driving current iy_driver may differ, the required driving power of the motor needs to be based on the maximum value of the driving power in both directions. That is, the maximum value of ix_driver and iy_driver is selected as the driving current to generate the voltage regulation command. Then, the required driving voltage is calculated based on the driving current and the motor's resistance value, and the voltage regulation command is generated based on the required driving voltage.

[0106] It should be noted that the displacement generated by the image acquisition device may be very small, resulting in very small calculated ix_driver and iy_driver, which in turn leads to a smaller calculated required driving voltage. In this case, it is necessary to refer to the normal operating voltage of the motor. When the required driving voltage is less than the normal operating voltage of the motor, the normal operating voltage of the motor is used as the required driving voltage, and a voltage adjustment command is generated based on the normal operating voltage of the motor.

[0107] In this embodiment, a voltage regulation command is generated based on the first drive current and the second drive current, ultimately enabling a more precise supply of drive voltage to the motor and further improving the energy efficiency ratio. Simultaneously, when the required drive voltage for the motor is low, a voltage regulation command can be generated based on the motor's normal operating voltage to ensure normal motor operation.

[0108] Example 15

[0109] Based on Example 11, the process of generating a voltage regulation signal according to displacement information may further include:

[0110] The first focus code and the second focus code are determined based on the displacement information, and a voltage adjustment command is generated based on the first focus code and the second focus code.

[0111] Not only can voltage adjustment commands be generated based on the drive current, but also based on the focus code. Specifically, when generating the voltage adjustment command, it is first necessary to calculate the drive current ix_driver required for the motor to drive the image acquisition device to move in the optical axis direction, and the drive current iy_driver required for the motor to drive the image acquisition device to move in the direction perpendicular to the optical axis. Then, the first focus code and the second focus code corresponding to ix_driver and iy_driver are determined. Next, an N-bit focus code is determined based on the first focus code and the second focus code, and a voltage adjustment command is generated based on the N-bit focus code. Here, N is a positive integer.

[0112] In this embodiment, a voltage adjustment command is generated based on the first focus code and the second focus code, which ultimately enables a more precise drive voltage to be provided to the motor, further improving the energy efficiency ratio.

[0113] It should be noted that, without conflict, the various embodiments and / or technical features described in this application can be arbitrarily combined with each other, and the resulting technical solutions should also fall within the protection scope of this application.

[0114] It should be understood that the specific examples in the embodiments of this application are only for the purpose of helping those skilled in the art to better understand the embodiments of this application, and are not intended to limit the scope of the embodiments of this application. Those skilled in the art can make various improvements and modifications based on the above embodiments, and all such improvements or modifications fall within the protection scope of this application.

[0115] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A driving device for driving a motor of an image acquisition device, characterized in that, The driving device includes: a control module, a driving module, and a voltage regulating unit. The control module and the driving module are housed in the same chip. The voltage regulating unit supplies power to the control module through the power supply interface of the control module. The control module is used to acquire displacement information of the image acquisition device, send a drive current command to the drive module according to the displacement information, and send a voltage regulation signal to the voltage regulation unit according to the displacement information. The driving module is used to generate a driving current according to the driving current command; The voltage regulating unit is used to adjust the voltage of the power input to a driving voltage that matches the driving current according to the voltage regulating signal, and transmit the driving voltage to the driving module to power the driving module, so that the driving module drives the motor through the driving current and the driving voltage. The displacement information includes at least X-axis displacement information and Y-axis displacement information. Correspondingly, the control module is used to generate a voltage regulating command according to the X-axis displacement information and the Y-axis displacement information, wherein the voltage regulating command is used to generate the voltage regulating signal. The control module is further configured to determine a first focus code and a second focus code based on the X-axis displacement information and the Y-axis displacement information, and generate the voltage adjustment command based on the first focus code and the second focus code. The first drive current corresponding to the first focus code is used to drive the motor to move the image acquisition device in the optical axis direction, and the second drive current corresponding to the second focus code is used to drive the motor to move the image acquisition device in the direction perpendicular to the optical axis.

2. The apparatus according to claim 1, characterized in that, The drive device also includes a digital-to-analog conversion module; The control module is used to send the voltage regulation command to the digital-to-analog converter module; The digital-to-analog conversion module is used to generate the voltage regulation signal according to the voltage regulation command, and send the voltage regulation signal to the voltage regulation unit so that the voltage regulation unit adjusts the voltage value of the input voltage of the power supply to the voltage value indicated by the voltage regulation signal.

3. The apparatus according to claim 1, characterized in that, The voltage regulating unit is used to adjust the voltage value of the input voltage of the power supply to the voltage value indicated by the voltage regulating signal according to the voltage regulating signal.

4. An image acquisition module, characterized in that, include: Displacement information generation device, drive device as described in any one of claims 1-3, motor and image acquisition device; The displacement information generating device is used to generate displacement information based on the displacement generated by the image acquisition device, and send the displacement information to the driving device; The motor, driven by the drive device, causes the image acquisition device to move.

5. The image acquisition module according to claim 4, characterized in that, The displacement information generation device includes a host computer or a gyroscope sensor; The host computer is used to generate displacement information of the image acquisition device based on multiple images acquired by the image acquisition device; The gyroscope sensor is used to convert the motion information of the image acquisition device into an angular quantity, and generate the displacement information of the image acquisition device based on the angular quantity, wherein the motion information of the image acquisition device includes at least the angular velocity and the acceleration of the image acquisition device.

6. A voltage adjustment method, applied to the drive device as described in any one of claims 1-3, characterized in that, The method includes: acquiring displacement information of the image acquisition device; A drive current command is generated based on the displacement information, wherein the displacement information includes at least X-axis displacement information and Y-axis displacement information; A pressure adjustment command is generated based on the X-axis displacement information and the Y-axis displacement information; The voltage regulation signal is generated according to the voltage regulation command; Generate a drive current according to the drive current command; The driving voltage is obtained by adjusting the voltage of the power input according to the voltage regulation signal; The motor is driven according to the driving current and the driving voltage, wherein the driving voltage is matched with the driving current, and the motor is used to drive the image acquisition device; The first focus code and the second focus code are determined based on the X-axis displacement information and the Y-axis displacement information; The voltage adjustment command is generated based on the first focus code and the second focus code, wherein the first drive current corresponding to the first focus code is used to drive the motor to move the image acquisition device in the optical axis direction, and the second drive current corresponding to the second focus code is used to drive the motor to move the image acquisition device in the direction perpendicular to the optical axis.

7. The method according to claim 6, characterized in that, Generating the voltage regulation signal according to the voltage regulation command includes: performing digital-to-analog conversion on the voltage regulation command to obtain the voltage regulation signal.

8. The method according to claim 6, characterized in that, Generating the voltage regulation signal according to the voltage regulation command includes: determining the voltage regulation command as the voltage regulation signal.

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