Inductive encoder, control method thereof, and camera device
By adjusting the signal parameters in the inductive encoder and replacing the dedicated chip with a general-purpose control chip, the problems of circuit complexity and low energy utilization are solved, resulting in cost reduction and improved energy utilization.
Patent Information
- Application Number
- CN202511484149.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-16
- Publication Date
- 2026-03-03
AI Technical Summary
Existing inductive encoders require dedicated chips, resulting in complex circuitry and high costs. Furthermore, the spacing between the stator and rotor affects the amount of received signal energy, leading to low energy utilization.
In the first stage, the control module outputs a preset second signal and adjusts the target parameters of the first signal to keep the signal strength of the sensed signal within a set range. In the second stage, the target parameters of the second signal are adjusted to make the signal strength of the sensed signal reach its maximum value. By using a general-purpose control chip instead of a dedicated chip, costs are reduced and energy utilization is improved.
This technology enables the improvement of energy utilization of inductive signals by adjusting signal parameters without relying on dedicated chips, thereby reducing the cost of inductive encoders and optimizing energy utilization efficiency.
Smart Images
Figure CN121594931A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of encoder technology, and in particular to an inductive encoder, its control method, and a camera device. Background Technology
[0002] Inductive encoders typically use dedicated integrated circuits to perform signal excitation, demodulation, and angle calculation.
[0003] Because it requires the use of dedicated chips, the circuitry is complex and the cost is high. Furthermore, the spacing between the stator and rotor affects the energy level of the received signal. Since the excitation signal is constant, the gain of the receiving circuit needs to be adjusted to stabilize the amplitude of the received signal within a certain range, resulting in low energy utilization. Summary of the Invention
[0004] This application provides at least one inductive encoder and its control method and camera device to maximize energy utilization.
[0005] The first aspect of this application provides an inductive encoder, including: a control module, a power supply module, an excitation signal generation module, an inductive coupling module, and an inductive receiving module. The control module includes a first signal output terminal, a second signal output terminal, and a signal receiving terminal; the power supply module includes a power output terminal and a power adjustment terminal connected to the first signal output terminal, the power supply module being configured to adjust the power supply voltage output by the power output terminal based on the first signal; the excitation signal generation module is connected to the power output terminal and the second signal output terminal, and is configured to generate an excitation signal in response to the power supply voltage and the second signal, wherein the amplitude of the excitation signal is determined by the power supply voltage, and the phase of the excitation signal is determined by the second signal; the inductive coupling module is connected to the excitation signal generation module and is configured to generate an inductive signal based on the excitation signal; the inductive receiving module is coupled to the inductive coupling module and is configured to generate an inductive signal based on the inductive signal and send it to the signal receiving terminal; wherein, the control module is configured to, in a first stage, output a preset second signal and adjust the target parameter of the first signal to make the signal strength of the inductive signal within a set range; in a second stage, adjust the target parameter of the second signal to make the signal strength of the inductive signal reach a maximum value, and record the target parameter of the second signal corresponding to when the signal strength reaches a maximum value; the first stage precedes the second stage.
[0006] A second aspect of this application provides a camera device, including a pan-tilt unit and a camera, wherein the pan-tilt unit includes the inductive encoder described in the first aspect.
[0007] A third aspect of this application provides an inductive encoder control method, comprising: in a first stage, outputting a preset second signal and adjusting a target parameter of a first signal to make the signal strength of the sensed signal within a set range; in a second stage, adjusting the target parameter of the second signal to make the signal strength of the sensed signal reach a maximum value, and recording the target parameter of the second signal corresponding to when the signal strength reaches the maximum value; the first stage precedes the second stage.
[0008] The above scheme, in the first stage, uses a control module to output a preset second signal and adjust the target parameters of the first signal to ensure the signal strength of the induced signal is within a set range. Since the first signal can adjust the power supply voltage output by the power module, adjusting the target parameters of the first signal allows the power module to output a power supply voltage with a signal strength suitable for the induced signal within the set range; that is, the power supply voltage output by the power module is just enough to generate an appropriate induced signal. In the second stage, the control module adjusts the target parameters of the second signal to maximize the signal strength of the induced signal, enabling the power module to obtain the induced signal with the maximum signal strength while outputting the same power supply voltage. Therefore, this method is beneficial for improving energy utilization.
[0009] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this application. Attached Figure Description
[0010] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with this application and, together with the specification, serve to explain the technical solutions of this application.
[0011] Figure 1 This is a schematic diagram of the framework of some embodiments of the inductive encoder of this application; Figure 2 This is a schematic diagram of the framework of some other embodiments of the inductive encoder of this application; Figure 3 This is a partial circuit structure diagram of an inductive encoder in some embodiments of this application; Figure 4 This is a schematic diagram of the circuit structure of the power supply module of the inductive encoder in some embodiments of this application; Figure 5 This is a schematic diagram of the frame of the camera device in some embodiments of this application; Figure 6 This is a flowchart illustrating the inductive encoder control method in some embodiments of this application. Detailed Implementation
[0012] The embodiments of this application will now be described in detail with reference to the accompanying drawings.
[0013] In the following description, specific details such as particular system architectures, interfaces, and technologies are presented for illustrative purposes rather than for limiting purposes, in order to provide a thorough understanding of this application.
[0014] In this document, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " generally indicates that the preceding and following related objects have an "or" relationship. Furthermore, "many" in this document means two or more. Moreover, the term "at least one" in this document means any combination of at least two of any one or more of a plurality of objects. For example, including at least one of A, B, and C can mean including any one or more elements selected from the set consisting of A, B, and C.
[0015] Please see Figure 1 This application provides an inductive encoder 100, including a control module 110, a power supply module 120, an excitation signal generation module 130, an inductive coupling module 140, and an inductive receiving module 150. The control module 110 includes a first signal output terminal P1, a second signal output terminal P2, and a signal receiving terminal P3; the power supply module 120 includes a power output terminal P5 and a power adjustment terminal P4 connected to the first signal output terminal P1, and is configured to adjust the power supply voltage output from the power output terminal P5 based on the first signal; the excitation signal generation module 130 is connected to the power output terminal P5 and the second signal output terminal P2, and is configured to generate an excitation signal in response to the power supply voltage and the second signal, wherein the amplitude of the excitation signal is determined by the power supply voltage, and the phase of the excitation signal is determined by the second signal; the inductive coupling module 140 is connected to the excitation... The signal generation module 130 is configured to generate a coupling signal based on an excitation signal; the inductor receiving module 150 is coupled to the inductor coupling module 140 and is configured to generate an induction signal based on the coupling signal and send it to the signal receiving terminal P3; wherein, the control module 110 is configured to, in the first stage, output a preset second signal and adjust the target parameter of the first signal to make the signal strength of the induction signal within a set range; in the second stage, adjust the target parameter of the second signal to make the signal strength of the induction signal reach a maximum value, and record the target parameter of the second signal corresponding to the signal strength reaching the maximum value; the first stage is before the second stage.
[0016] In the inductive encoder 100, the inductive coupling module 140 and the inductive receiving module 150 are coupled to each other based on the mutual inductance effect. The inductive coupling module 140 generates an eddy current effect on the rotor metal conductor, which then acts on the inductive receiving module 150. In the inductive receiving module 150, the position information is modulated into an induced voltage.
[0017] In some embodiments, the inductive coupling module 140 may include an LC resonant circuit. The specific structure of the inductive coupling module 140 is not limited in this application. The first signal and the second signal may be pulse width modulation (PWM) signals. The first signal and the second signal are generated by the control module 110, and the pulse widths of the first signal and the second signal are adjustable. The excitation signal output by the excitation signal generation module 130 may be a sinusoidal signal. The excitation signal may contain a fundamental frequency and multiple harmonics, while the inductive coupling module 140 only resonates with the fundamental frequency, and the multiple harmonics in the excitation signal are filtered out by the inductive coupling module 140. Therefore, when the fundamental frequency component in the excitation signal reaches its maximum, the inductive coupling module 140 can generate a coupling signal with the maximum strength, thereby maximizing the signal strength of the induced signal in the inductive receiving module 150. Furthermore, by adjusting the target parameter of the second signal, the phase of the excitation signal can be adjusted to maximize the fundamental frequency component in the excitation signal, thereby maximizing the signal strength of the induced signal.
[0018] In some embodiments, the target parameter of the first signal may include the duty cycle value of the first signal, and the target parameter of the second signal may include the duty cycle value of the second signal. The power supply module 120 can adjust the output power supply voltage based on the duty cycle of the first signal.
[0019] In some embodiments, the target parameter of the first signal may further include the signal strength of the first signal, such as the voltage value of the first signal. The power supply module 120 can adjust the output power supply voltage based on the signal strength of the first signal.
[0020] Understandably, since multiple harmonics in the excitation signal are filtered out by the inductive coupling module 140, they do not contribute to the generation of the induced signal. The higher the content of multiple harmonics in the excitation signal, the more energy is filtered out by the inductive coupling module 140, resulting in lower energy utilization. Therefore, to improve energy utilization, the content of multiple harmonics in the excitation signal can be minimized to maximize the fundamental frequency intensity.
[0021] The phase of the excitation signal is adjusted by regulating the target parameters of the second signal, thereby generating coupling signals of different phases in the inductive coupling module 140. This allows the inductive receiving module to generate induced signals of different intensities. When the signal strength of the induced signal reaches its maximum value, it indicates that the fundamental frequency intensity in the excitation signal is at its highest, resulting in the highest energy utilization rate. The target parameters of the second signal corresponding to this point are recorded.
[0022] The above scheme, in the first stage, uses the control module 110 to output a preset second signal and adjust the target parameters of the first signal so that the signal strength of the induced signal is within a set range. Since the first signal can adjust the power supply voltage output by the power module 120, adjusting the target parameters of the first signal allows the power module 120 to output a power supply voltage with a signal strength suitable for the induced signal within the set range; that is, the power supply voltage output by the power module 120 can just generate an appropriate induced signal. In the second stage, the control module 110 adjusts the target parameters of the second signal to maximize the signal strength of the induced signal, so that the power module 120 obtains the induced signal with the maximum signal strength while outputting the same power supply voltage. Therefore, it is beneficial to improve energy utilization.
[0023] Furthermore, in the inductive encoder 100 provided in this application, the power supply voltage can be provided by the power supply module 120, the excitation signal can be provided by the excitation signal generation module 130, and the coupling signal can be provided by the inductive coupling module 140. The control module 110 can be used to generate a first signal and a second signal with adjustable duty cycle values, and to receive the inductive signal. Therefore, the control module 110 does not rely on a complex dedicated chip for the inductive encoder 100, and can use a general-purpose control chip, thereby reducing costs.
[0024] In some embodiments, the inductive encoder 100 can perform the first and second phase operations during the initialization phase after power-on. As mentioned earlier, the excitation signal output by the excitation signal generation module 130 may contain multiple harmonics in addition to the fundamental frequency. The generation of these multiple harmonics is related to the discreteness of the devices in the excitation signal generation module 130 and does not change significantly with time and external conditions such as temperature. Therefore, after obtaining the target parameters of the second signal by performing the first and second phase operations, the target parameters of the second signal do not need to be frequently adjusted.
[0025] In some embodiments, the control module 110 is also configured to, in a third stage, adjust the first signal so that the signal strength of the sensed signal is within the set range in response to the signal strength being outside the set range, and record the target parameters of the first signal corresponding to the signal strength being within the set range.
[0026] During the operation of the inductive encoder 100, the stator-rotor spacing may change. When the stator-rotor spacing changes, even if the coupling signal remains unchanged, the intensity of the induced signal may change with the stator-rotor spacing.
[0027] Please combine Figure 1The target parameter of the first signal is used to adjust the power supply voltage output by the power supply module 120, and the amplitude of the excitation signal is determined by the power supply voltage. The larger the amplitude of the excitation signal, the stronger the signal strength of the induced signal. Therefore, when the change in the stator-rotor spacing causes the induced signal strength to change beyond the set range, the signal strength of the induced signal can be brought back within the set range by adjusting the first signal.
[0028] By adjusting the first signal to keep the signal strength of the induced signal within a set range when the distance between the stator and rotor changes, the power module can reduce the output power voltage when the induced signal strength increases, which is beneficial to further improve energy utilization.
[0029] In some embodiments, the target parameters of the first signal and the target parameters of the second signal can be stored in ROM.
[0030] In some embodiments, the encoder control module 110 is further configured to determine whether the target parameters of the first signal and the target parameters of the second signal are stored before performing the operations of the first stage, the second stage, and the third stage; to perform the operation of the third stage in response to storing the target parameters of the first signal and the target parameters of the second signal; and to perform the operations of the first stage and the second stage in response to not storing the target parameters of the first signal and the target parameters of the second signal.
[0031] In other words, if the target parameters of the first and second signals are not saved after power-on, the target parameters need to be determined first. After setting the target parameters, if the signal strength of the induced signal changes due to changes in the stator-rotor spacing during operation, the third stage operation is then executed to adjust the target parameters of the first signal.
[0032] In some implementations, adjusting the target parameter of the first signal to make the signal strength of the sensed signal within a set range includes: determining a first target parameter of the first signal and a first signal strength of the sensed signal corresponding to the first target parameter; performing iterative calculation based on the first target parameter, the first signal strength, and a prediction formula to determine a prediction target parameter and a second signal strength corresponding to the prediction target parameter; and recording the prediction target parameter within the set range in response to the second signal strength.
[0033] The prediction formula can be obtained by fitting the target parameters of a series of measured first signals with the signal intensity of the corresponding induced signals. This application does not limit the specific fitting method or the specific prediction formula.
[0034] In some implementations, adjusting the target parameter of the second signal to make the signal strength of the sensed signal reach its maximum value and recording the target parameter of the second signal corresponding to the maximum signal strength includes: determining the target duty cycle value sequentially within a preset duty cycle range; sequentially adjusting the target parameter of the second signal to the target duty cycle value and reading the signal strength corresponding to the target duty cycle value; and recording the target duty cycle value corresponding to the maximum signal strength.
[0035] For example, within a preset duty cycle range, target duty cycle values are determined sequentially in ascending order of duty cycle value. The target parameters of the second signal are then sequentially set to the target duty cycle values, the corresponding signal strengths are read, and the target duty cycle value corresponding to the highest signal strength is recorded. For instance, assuming the preset duty cycle range is 45%~55%, 45%, 46%, 47%...55% can be sequentially used as target duty cycle values, and the target duty cycle of the second signal can be sequentially set to 45%, 46%, 47%...55%, with the target duty cycle value corresponding to the highest signal strength recorded. The preset duty cycle range can be set according to actual needs, and this application does not impose any limitations.
[0036] In some implementations, the first signal and the second signal are pulse width modulation signals.
[0037] In some embodiments, the preset duty cycle value of the second signal is 50%. The preset duty cycle of the second signal can also be set to other values, which are not limited in this application.
[0038] In some implementation methods, please refer to Figure 2 The encoder excitation signal generation module 130 includes a push-pull circuit 131, which includes a power input terminal P6, a phase control terminal P7, and a push-pull output terminal P8. The power input terminal P6 is connected to the power output terminal P5, the phase control terminal P7 is connected to the second signal output terminal P2, and the push-pull output terminal P8 is connected to the inductive coupling module 140.
[0039] In some embodiments, the excitation signal generation module 130 further includes a filter circuit 132 and an amplifier circuit 133. The filter circuit 132 is connected to the push-pull output terminal P8; the amplifier circuit 133 is connected to the output terminal of the filter circuit 132 and the input terminal of the inductive coupling module 140, so as to amplify the filtered push-pull output to generate an excitation signal that is output to the inductive coupling module 140.
[0040] Please refer to Figure 3 , Figure 3In the diagram, R1~R12 represent resistors, C1~C12 represent capacitors, GND1~GND8 represent ground terminals, Q1 and Q2 are field-effect transistors (FETs), U1 and U2 are operational amplifiers, and L1 is an inductor. The push-pull circuit 131 mainly includes FETs Q1 and Q2. The gates of FETs Q1 and Q2 can be used as phase control terminals P7, connected to the second signal output terminal P2 via resistor R1. The source of FET Q1 is also connected to the power output terminal P5 of the power module 120. When the second signal output from the second signal output terminal P2 switches between high and low levels, FETs Q1 and Q2 also switch between on and off states accordingly, thereby controlling the push-pull output to switch between high and low levels. Figure 3 As can be seen, the amplitude of the excitation signal output by the excitation signal generation module 130 is mainly determined by the push-pull output of the push-pull circuit 131, and the amplitude of the push-pull output is mainly determined by the power supply voltage output by the power supply output terminal P5 of the power supply module 120. Therefore, the power supply voltage output by the power supply output terminal P5 determines the amplitude of the excitation signal.
[0041] Operational amplifier U1 and its peripheral circuits form filter circuit 132. Operational amplifier U2 and its peripheral circuits form amplifier circuit 133. The square wave signal output from push-pull circuit 131 is converted into a sine wave signal after passing through filter circuit 132.
[0042] The inductive coupling module 140 includes an inductor L1 and capacitors C10 to C12 connected in parallel to form an LC parallel resonant circuit.
[0043] Please refer to Figure 4 , Figure 4 In the diagram, R13~R19 represent resistors, C13~C19 represent capacitors, and GND9~GND10 represent grounding. The power module 120 mainly includes a power chip U3. The input terminal VIN and enable terminal EN of the power chip U3 are connected to a 5V power supply. The first signal, after being filtered by resistors R13~R15 and capacitors C18~C19, is connected to the power adjustment terminal P4 of the power chip U3. The power chip U3 can adjust the output voltage VOUT of its output terminal according to the first signal received at the power adjustment terminal P4, thereby adjusting the power supply voltage output at the power output terminal P5.
[0044] This application does not impose restrictions on the specific selection of the power supply chip U3.
[0045] Figure 3 and Figure 4This application merely illustrates one circuit structure of the inductive encoder 100. The inductive encoder 100 may also employ other circuit structures. For example, the inductive coupling module 140 may employ an LC series resonant circuit. This application does not limit the specific circuit structure of the inductive encoder 100.
[0046] Please refer to Figure 5 The second aspect of this application provides a camera device 600, including a pan-tilt unit 620 and a camera 610, wherein the pan-tilt unit 620 includes the inductive encoder 100 in any of the above embodiments.
[0047] Please refer to Figure 6 The third aspect of this application provides an inductive encoder control method, applied to the inductive encoder 100 of any embodiment of the first aspect described above, the method comprising: Step S100: In the first stage, a preset second signal is output, and the target parameters of the first signal are adjusted so that the signal strength of the sensed signal is within the set range.
[0048] Step S200: In the second stage, adjust the target parameter of the second signal to make the signal strength of the sensed signal reach the maximum value, and record the target parameter of the second signal when the signal strength reaches the maximum value.
[0049] The first phase precedes the second phase.
[0050] In some embodiments, the method further includes: in a third stage, in response to a signal strength not being within a set range, adjusting a first signal to bring the signal strength of the sensed signal within a set range, and recording the target parameters of the first signal corresponding to the signal strength being within the set range.
[0051] In some embodiments, the method further includes: determining whether target parameters of the first signal and target parameters of the second signal are stored before performing the operations of the first stage, the second stage, and the third stage; performing the operations of the third stage in response to storing the target parameters of the first signal and the target parameters of the second signal; and performing the operations of the first stage and the second stage in response to not storing the target parameters of the first signal and the target parameters of the second signal.
[0052] In some embodiments, adjusting the target parameter of the first signal to make the signal strength of the sensed signal within a set range includes: determining a first target parameter of the first signal and a first signal strength of the sensed signal corresponding to the first target parameter; performing iterative calculation based on the first target parameter, the first signal strength, and a prediction formula to determine a prediction target parameter and a second signal strength corresponding to the prediction target parameter; and recording the prediction target parameter in response to the second signal strength being within the set range.
[0053] In some implementations, adjusting the target parameter of the second signal to make the signal strength of the sensed signal reach its maximum value and recording the target parameter of the second signal corresponding to the maximum signal strength includes: determining the target duty cycle value sequentially within a preset duty cycle range; sequentially adjusting the target parameter of the second signal to the target duty cycle value and reading the signal strength corresponding to the target duty cycle value; and recording the target duty cycle value corresponding to the maximum signal strength.
[0054] In some implementations, the first signal and the second signal are pulse width modulation signals.
[0055] In some implementations, the preset duty cycle value of the second signal is 50%.
[0056] Those skilled in the art will understand that, in the above-described method of the specific implementation, the order in which each step is written does not imply a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of each step should be determined by its function and possible internal logic.
[0057] In some embodiments, the functions or modules of the apparatus provided in this disclosure can be used to perform the methods described in the above method embodiments. The specific implementation can be referred to the description of the above method embodiments, and for the sake of brevity, it will not be repeated here.
[0058] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.
[0059] In the several embodiments provided in this application, it should be understood that the disclosed methods and apparatus can be implemented in other ways. For example, the apparatus implementations described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms.
[0060] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.
[0061] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the methods of various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.
Claims
1. An inductive encoder, characterized in that, include: The control module includes a first signal output terminal, a second signal output terminal, and a signal receiving terminal; A power module includes a power output terminal and a power adjustment terminal connected to the first signal output terminal. The power module is configured to adjust the power voltage output by the power output terminal based on the first signal. An excitation signal generation module, connected to the power output terminal and the second signal output terminal, is configured to generate an excitation signal in response to the power supply voltage and the second signal, wherein the amplitude of the excitation signal is determined by the power supply voltage and the phase of the excitation signal is determined by the second signal; An inductive coupling module, connected to the excitation signal generation module, is configured to generate a coupling signal based on the excitation signal; An inductive receiving module, coupled to the inductive coupling module, is configured to generate an inductive signal based on the coupling signal and send it to the signal receiving end; The control module is configured to, in a first stage, output a preset second signal and adjust the target parameter of the first signal to make the signal strength of the sensed signal within a set range; in a second stage, adjust the target parameter of the second signal to make the signal strength of the sensed signal reach a maximum value, and record the target parameter of the second signal corresponding to when the signal strength reaches a maximum value; the first stage precedes the second stage.
2. The encoder according to claim 1, characterized in that, The control module is also configured to, in the third stage, adjust the first signal so that the signal strength of the sensed signal is within the set range in response to the signal strength being outside the set range, and record the target parameters of the first signal corresponding to the signal strength being within the set range.
3. The encoder according to claim 2, characterized in that, The control module is also configured to: Before performing the operations of the first stage, the second stage, and the third stage, it is determined whether the target parameters of the first signal and the target parameters of the second signal are stored. In response to storing the target parameters of the first signal and the target parameters of the second signal, the operation of the third stage is performed; In response to the absence of target parameters for the first signal and target parameters for the second signal, the operations of the first stage and the second stage are performed.
4. The encoder according to claim 1, characterized in that, The step of adjusting the target parameter of the first signal to make the signal strength of the sensed signal within a set range includes: Determine a first target parameter of the first signal and a first signal strength of the sensed signal corresponding to the first target parameter; Based on the first target parameter, the first signal strength and the prediction formula, iterative calculations are performed to determine the prediction target parameter and the second signal strength corresponding to the prediction target parameter; In response to the second signal strength being within the set range, the predicted target parameters are recorded.
5. The encoder according to claim 1, characterized in that, The target parameters of the second signal include the duty cycle value; The step of adjusting the target parameter of the second signal to maximize the signal strength of the sensed signal, and recording the target parameter of the second signal corresponding to the maximum signal strength, includes: Within the preset duty cycle range, determine the target duty cycle values sequentially; The target parameters of the second signal are sequentially adjusted to the target duty cycle value, and the signal strength corresponding to the target duty cycle value is read. Record the target duty cycle value corresponding to the maximum signal strength.
6. The encoder according to claim 1, characterized in that, The first signal and the second signal are pulse width modulation signals.
7. The encoder according to claim 1, characterized in that, The preset duty cycle value of the second signal is 50%.
8. The encoder according to claim 1, characterized in that, The excitation signal generation module includes: The push-pull circuit includes a power input terminal, a phase control terminal, and a push-pull output terminal. The power input terminal is connected to the power output terminal, the phase control terminal is connected to the second signal output terminal, and the push-pull output terminal is connected to the inductive coupling module.
9. The encoder according to claim 8, characterized in that, The excitation signal generation module further includes: The filter circuit is connected to the push-pull output terminal; An amplifier circuit is connected to the output of the filter circuit and the input of the inductive coupling module to amplify the filtered push-pull output and generate the excitation signal, which is then output to the inductive coupling module.
10. A camera device, comprising a pan-tilt unit and a camera, characterized in that, The gimbal includes the inductive encoder as described in any one of claims 1-9.
11. A method for controlling an inductive encoder, characterized in that, The method, applied to the inductive encoder according to any one of claims 1 to 9, comprises: In the first stage, a preset second signal is output, and the target parameters of the first signal are adjusted to make the signal strength of the sensed signal within a set range; In the second stage, the target parameter of the second signal is adjusted so that the signal strength of the sensed signal reaches its maximum value, and the target parameter of the second signal corresponding to the maximum signal strength is recorded; the first stage is before the second stage.