CN111600570A - Pressure-controlled active crystal oscillator control device and method and stage oscillating lamp - Google Patents
Pressure-controlled active crystal oscillator control device and method and stage oscillating lamp Download PDFInfo
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/15—Constructional features of resonators consisting of piezoelectric or electrostrictive material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V21/00—Supporting, suspending, or attaching arrangements for lighting devices; Hand grips
- F21V21/14—Adjustable mountings
- F21V21/15—Adjustable mountings specially adapted for power operation, e.g. by remote control
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
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- H—ELECTRICITY
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Abstract
The invention relates to a pressure-controlled active crystal oscillator control device and method and a stage moving head lamp. The voltage-controlled active crystal oscillator control device comprises a controller and a voltage adjusting circuit. The controller is used for receiving a user instruction and generating a voltage regulation parameter according to the user instruction, wherein the user instruction is input by a user based on the frequency offset between the output frequency of the voltage-controlled active crystal oscillator and the nominal frequency of the voltage-controlled active crystal oscillator; the voltage adjusting circuit is electrically connected with the controller and used for receiving and adjusting the driving voltage according to the voltage adjusting parameter and providing the adjusted driving voltage for the voltage-controlled active crystal oscillator so as to enable the frequency deviation of the output frequency and the nominal frequency to be within a preset range, and therefore the problem of asynchronization caused by different output frequencies of the crystal oscillator is solved.
Description
Technical Field
The invention relates to the technical field of crystal oscillator control, in particular to a pressure-controlled active crystal oscillator control device and method and a stage oscillating lamp.
Background
In the field of stage moving head lamps, certain electrodeless rotation functions are required. However, in practical application, if the moving head lamp performs the stepless rotation function for a long time, the rotation angles (including X-axis and Y-axis) of the multiple stage moving head lamps are different, that is, the rotation synchronism of the multiple moving head lamps is not good. One of the main reasons for this problem is caused by the frequency deviation of the operating crystal oscillator of the crystal oscillator main board of each moving head lamp, which causes the asynchronous phenomenon due to the continuous accumulation of errors during long-time operation. Since the crystal oscillator is a standard device on the market, frequency deviation must exist between different crystal oscillators due to the limitation of manufacturing precision and process.
Due to the existence of inherent frequency deviation of the standard crystal oscillator, the existing traditional technology cannot overcome and improve the problem of asynchronism when a plurality of moving head lamps simultaneously do long-time electrodeless rotation; and the larger the frequency deviation difference of the two crystal oscillators is, the more obvious the asynchronous phenomenon is.
Disclosure of Invention
The invention provides a pressure-controlled active crystal oscillator control device and method and a stage moving head lamp, and aims to solve the problem of asynchronism caused by using a low-cost crystal oscillator as a working clock.
The embodiment of the invention provides a voltage-controlled active crystal oscillator control device, which comprises:
the controller is used for receiving a user instruction and generating a voltage regulation parameter according to the user instruction, wherein the user instruction is input by a user based on the frequency offset between the output frequency of the voltage-controlled active crystal oscillator and the nominal frequency of the voltage-controlled active crystal oscillator; and
and the voltage adjusting circuit is electrically connected with the controller and used for receiving and adjusting the driving voltage according to the voltage adjusting parameter and providing the adjusted driving voltage for the voltage-controlled active crystal oscillator so as to enable the frequency deviation between the output frequency and the nominal frequency to be within a preset range.
In one embodiment, the predetermined frequency range is-0.125 to 0.125 ppm.
In one embodiment, the voltage-controlled active crystal oscillator control device further comprises a human-computer interaction device, and the human-computer interaction device is electrically connected with the controller and used for inputting the user instruction.
In one embodiment, the human-computer interaction device is an upper computer, a control key or a control panel.
In one embodiment, the voltage-controlled active crystal oscillator control device further includes a measuring instrument electrically connected to the voltage-controlled active crystal oscillator for detecting an output frequency of the voltage-controlled active crystal oscillator.
In one embodiment, the measuring instrument is a spectrometer or a high-precision oscilloscope.
In one embodiment, the voltage-controlled active crystal oscillator control apparatus further includes:
the memory is electrically connected with the controller and used for storing preset voltage regulation parameters;
the controller is further configured to obtain the preset voltage adjustment parameter from the memory and send the preset voltage adjustment parameter to the voltage adjustment circuit before receiving a user instruction; and generating the voltage regulation parameter according to the user instruction, sending the voltage regulation parameter to the memory, and updating the data in the memory
In one embodiment, the controller is a micro control unit, a central processing unit, a digital signal processing, or a programmable logic device.
Based on the same inventive concept, the embodiment of the invention also provides a control method of the voltage-controlled active crystal oscillator, which comprises the following steps:
receiving a user instruction, and generating a voltage regulation parameter according to the user instruction, wherein the user instruction is input by a user based on the frequency offset between the output frequency of the voltage-controlled active crystal oscillator and the nominal frequency of the voltage-controlled active crystal oscillator;
and adjusting the driving voltage according to the voltage adjusting parameter, and providing the adjusted driving voltage for the voltage-controlled active crystal oscillator so as to enable the frequency deviation between the output frequency and the nominal frequency to be within a preset range.
In one embodiment, the output frequency of the voltage-controlled active crystal oscillator increases with the increase of the driving voltage.
In one embodiment, the control method further includes: and before the output frequency of the voltage-controlled active crystal oscillator is obtained, obtaining preset voltage adjusting parameters from the memory and sending the preset voltage adjusting parameters to the voltage adjusting circuit.
In one embodiment, the control method further includes:
and sending the voltage regulation parameter generated according to a user instruction to the memory, and updating the data in the memory.
Based on the same inventive concept, the embodiment of the present invention further provides a stage moving head light fixture, comprising:
the stepping motor is used for driving the rotating device to rotate; and
the motor control board is electrically connected with the stepping motor and is used for controlling the rotation of the moving head lamp;
the motor control board comprises a motor driving circuit and a crystal oscillator control circuit;
the crystal oscillator control circuit comprises a voltage-controlled active crystal oscillator, a controller and a voltage regulating circuit; the controller is used for receiving a user instruction and generating a voltage regulation parameter according to the user instruction, wherein the user instruction is input by a user based on the frequency offset between the output frequency of the voltage-controlled active crystal oscillator and the nominal frequency of the voltage-controlled active crystal oscillator; the voltage adjusting circuit is electrically connected with the controller and used for receiving and adjusting the driving voltage according to the voltage adjusting parameter and providing the adjusted driving voltage for the voltage-controlled active crystal oscillator so as to enable the frequency deviation of the output frequency and the nominal frequency to be within a preset range;
the motor driving circuit is electrically connected with a controller in the crystal oscillator control circuit and is directly controlled by the controller.
In one embodiment, the crystal oscillation control circuit further includes:
the memory is electrically connected with the controller and used for storing preset voltage regulation parameters;
the controller is further configured to obtain the preset voltage adjustment parameter from the memory and send the preset voltage adjustment parameter to the voltage adjustment circuit before receiving a user instruction; and sending the voltage regulation parameter generated according to the user instruction to the memory, and updating the data in the memory.
In summary, the embodiment of the invention provides a voltage-controlled active crystal oscillator control device and method and a stage moving head lamp. Wherein the apparatus comprises a controller and a voltage regulation circuit. The controller is used for receiving a user instruction and generating a voltage regulation parameter according to the user instruction, wherein the user instruction is input by a user based on the frequency offset between the output frequency of the voltage-controlled active crystal oscillator and the nominal frequency of the voltage-controlled active crystal oscillator; the voltage adjusting circuit is electrically connected with the controller and used for receiving and adjusting the driving voltage according to the voltage adjusting parameter and providing the adjusted driving voltage for the voltage-controlled active crystal oscillator so as to enable the frequency deviation between the output frequency and the nominal frequency to be within a preset range. In the invention, the voltage regulating parameter is generated by the controller according to the user instruction and is sent to the voltage regulating circuit, so that the voltage regulating circuit regulates the driving voltage according to the voltage regulating parameter and provides the regulated driving voltage to the voltage-controlled active crystal oscillator, further, the frequency deviation between the output frequency and the nominal frequency of the voltage-controlled active crystal oscillator is in a preset range, the frequency difference between the crystal oscillators is reduced, and the problem of asynchronization caused by different output frequencies of the crystal oscillators is solved.
Drawings
Fig. 1 is an electrical schematic diagram of a voltage-controlled active crystal oscillator control apparatus according to an embodiment of the present invention;
fig. 2 is an electrical schematic diagram of another voltage-controlled active crystal oscillator control apparatus according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a control method for controlling a voltage-controlled active crystal oscillator according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of another voltage-controlled active crystal oscillator control method according to an embodiment of the present invention;
fig. 5 is an electrical schematic diagram of a stage moving head light fixture according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Referring to fig. 1, an embodiment of the invention provides a voltage-controlled active crystal oscillator control apparatus, which includes a controller 110 and a voltage adjusting circuit 120.
The controller 110 is configured to receive a user instruction, and generate a voltage adjustment parameter according to the user instruction, where the user instruction is input by a user based on a frequency offset between an output frequency of the voltage-controlled active crystal oscillator and a nominal frequency of the voltage-controlled active crystal oscillator.
The voltage adjusting circuit 120 is electrically connected to the controller 110, and configured to receive and adjust a driving voltage according to the voltage adjustment parameter, and provide the adjusted driving voltage to the voltage-controlled active crystal oscillator, so that a frequency offset between the output frequency and the nominal frequency is within a preset range.
It can be understood that, when the frequency offset between the output frequency and the nominal frequency exceeds a preset range, a user inputs the user command based on the output frequency of the voltage-controlled active crystal oscillator and the nominal frequency of the voltage-controlled active crystal oscillator, and the controller 110 generates a voltage adjustment parameter according to the user command and sends the voltage adjustment parameter to the voltage adjustment circuit 120, so that the voltage adjustment circuit 120 adjusts a driving voltage according to the voltage adjustment parameter and provides the adjusted driving voltage to the voltage-controlled active crystal oscillator, thereby making the frequency offset between the output frequency and the nominal frequency of the voltage-controlled active crystal oscillator within the preset range, reducing the frequency difference between the crystal oscillators, improving the problem of asynchronous moving head lamps caused by different output frequencies of the crystal oscillators, and reducing the cost.
In this embodiment, the voltage-controlled active crystal oscillator may be a low-cost voltage-controlled active crystal oscillator VCXO, the nominal frequency accuracy of which may be 20ppm or less, and the voltage-controlled active crystal oscillator may adjust the output frequency of the crystal oscillator by the level change of the voltage-controlled pin. The voltage adjusting circuit 120 is a chip or a circuit capable of changing the magnitude of the output voltage according to the voltage adjusting parameter control, and is used for controlling the magnitude of the voltage-controlled pin level of the voltage-controlled active crystal oscillator VCXO; in addition, the voltage adjustment circuit 120 may be integrated with the controller 110 in the same chip. Specifically, the voltage adjusting circuit 120 may be a DAC converter, an RC converting circuit, or the like. When the voltage-controlled active crystal oscillator control device is initialized, the controller 110 is used to obtain the stored initial voltage adjustment parameter, and the initial voltage adjustment parameter is sent to the voltage adjustment circuit 120, so as to control the voltage adjustment circuit 120 to output the driving voltage and provide the driving voltage for the voltage-controlled pin of the voltage-controlled active crystal oscillator VCXO. Then, the output frequency of the voltage-controlled active crystal oscillator VCXO is obtained, and whether a user instruction needs to be input to reduce or increase the output voltage value of the voltage adjusting circuit 120 is determined by manually determining whether the output frequency exceeds or is less than the nominal frequency of the voltage-controlled active crystal oscillator and the frequency offset between the output frequency and the nominal frequency.
In addition, in the process of adjusting the output frequency of the voltage-controlled active crystal oscillator control device, a user usually repeatedly detects and judges whether the frequency offset between the output frequency of the voltage-controlled active crystal oscillator VCXO and the nominal frequency is within a preset range, and repeatedly adjusts the driving voltage when the frequency offset between the output frequency and the nominal frequency exceeds the preset range until the output frequency of the voltage-controlled active crystal oscillator VCXO meets the requirement.
In one embodiment, the predetermined frequency range is-0.125 to 0.125 ppm. It can be understood that the larger the frequency offset between the output frequency and the nominal frequency is, the more serious the asynchronous phenomenon is caused due to continuous accumulation of errors during long-time running, and therefore, the frequency offset between the output frequency and the nominal frequency of the voltage-controlled active crystal oscillator needs to be controlled within a reasonable range to ensure that no obvious asynchronous phenomenon occurs during long-time running.
In one embodiment, the controller 110 may be an intelligent chip such as an MCU (micro controller Unit), a CPU (Central Processing Unit), a DSP (Digital Signal Processing), or an FPGA (Field Programmable Gate Array), and may be configured to control to adjust the voltage adjustment parameter according to a user instruction input by a user, so that the voltage adjustment circuit 120 changes the output driving voltage according to the adjustment of the voltage adjustment parameter, so that the frequency offset between the output frequency and the nominal frequency of the voltage-controlled active crystal oscillator operating under the adjusted driving voltage is within-0.125 ppm to 0.125 ppm.
Referring to fig. 2, in one embodiment, the voltage-controlled active crystal oscillator control apparatus further includes a human-computer interaction device 130, and the human-computer interaction device 130 is electrically connected to the controller 110 and is configured to input the user instruction. It can be understood that the human-computer interaction device 130 is electrically connected with the controller 110 inside the high-precision crystal oscillator control circuit when the frequency is calibrated, and information interaction between a human and the controller 110 can be completed through the human-computer interaction device 130; specifically, when the frequency offset between the output frequency of the voltage-controlled active crystal oscillator and the nominal frequency exceeds-0.125 ppm to 0.125ppm, a user can input a user instruction through the human-computer interaction device 130, so that the controller 110 changes the voltage adjustment parameter based on the received user instruction.
It is understood that the main function of the human-computer interaction device 130 is to control the operation and understanding of the relevant devices and to execute the relevant commands and requirements transmitted through the human-computer interaction device, and the devices generally used for human-computer interaction mainly include a keyboard display, a mouse, various pattern recognition devices, and the like. In one embodiment, the human-computer interaction device 130 includes that the human-computer interaction device 130 is an upper computer, a control key or a control panel. In this embodiment, the human-computer interaction device 130 is a control panel, the control panel is provided with a display screen and a plurality of adjusting knobs, and a user can increase or decrease specific values of the voltage adjusting parameters by rotating the adjusting knobs and display the adjusted parameter values on the display screen.
In one embodiment, the voltage-controlled active crystal oscillator control device further includes a measuring instrument 140, and the measuring instrument 140 is electrically connected to the voltage-controlled active crystal oscillator and is configured to detect an output frequency of the voltage-controlled active crystal oscillator. It can be understood that the output frequency of the current voltage-controlled active crystal oscillator is obtained by the measuring instrument 140, so that a user can determine whether the output frequency of the current voltage-controlled active crystal oscillator meets the requirement of synchronization. In an actual measurement process, the measuring instrument 140 may be a device having a function of measuring a signal frequency, such as a spectrometer or a high-precision oscilloscope.
In one embodiment, the voltage-controlled active crystal control apparatus further includes a memory 150.
The memory 150 is electrically connected to the controller 110 for storing the voltage regulation parameter.
The controller 110 is further configured to, before receiving a user instruction, obtain the voltage adjustment parameter from the memory 150 and send the voltage adjustment parameter to the voltage adjustment circuit 120; and sending the voltage adjustment parameter generated according to the user instruction to the memory 150, and updating the data in the memory 150.
In this embodiment, the memory 150, the controller 110, the voltage adjusting circuit 120, and the voltage-controlled active crystal oscillator together form a high-precision crystal oscillator control circuit, and an output clock of the voltage-controlled active crystal oscillator is directly used as an operating clock of the controller 110.
In addition, the memory 150 in this embodiment is a nonvolatile memory device, such as an EEPROM (electrically erasable and Programmable read only memory), a FLASH memory, an on-chip FLASH of an MCU (micro controller unit), and the like. The memory 150 stores voltage adjustment parameters, and when the voltage adjustment parameters are initially initialized, the voltage adjustment parameters of the voltage-controlled active crystal oscillators of the same model correspond to the same default value. In addition, in the subsequent use process, the value of the voltage adjustment parameter of each voltage-controlled active crystal oscillator can be read, written and modified by the controller 110 according to the actual requirement. In addition, the memory may be a separate circuit or may be integrated in the controller 110.
It is assumed that the tuning voltage corresponding to the nominal frequency of the voltage controlled active crystal VCXO is defined as half VCC (power supply voltage), for example, the voltage controlled active crystal VCXO with VCC of 5V should generate the nominal frequency when the control voltage is 2.5V. When the driving voltage is (0.5-4.5) V, the slope of the output frequency change curve is positive; that is, when the driving voltage rises from 2.5V to 4.5V, the frequency of the oscillator will increase; when the control voltage is reduced from 2.5V to 0.5V, the frequency of the oscillator will decrease. The working principle of the voltage-controlled active crystal oscillator in this embodiment is as follows:
first, the voltage-controlled active crystal oscillator is initialized, and the controller 110 reads the voltage adjustment parameter from the memory 150, and controls the voltage adjustment circuit 120 to output the driving voltage by using the voltage adjustment parameter, and provides the driving voltage to the voltage-controlled pin of the voltage-controlled active crystal oscillator VCXO.
Then, the current output frequency of the voltage-controlled active crystal oscillator VCXO is measured by using a frequency spectrograph or a high-precision oscilloscope, and whether the measured output frequency exceeds or is less than the nominal frequency of the voltage-controlled active crystal oscillator is determined, so as to determine that the driving voltage output by the voltage adjusting circuit 120 needs to be reduced or increased by changing the voltage adjusting parameter. If the frequency deviation between the current output frequency of the VCXO and the nominal frequency of the voltage-controlled active crystal oscillator is within +/-0.125 ppm, no adjustment is carried out. Otherwise, according to the relationship between the actually measured frequency value and the nominal frequency value of the VCXO, a user instruction is input through the human-computer interaction device 130, and then the output frequency of the voltage-controlled active crystal oscillator VCXO is adjusted, so that the frequency offset between the current output frequency of the voltage-controlled active crystal oscillator VCXO and the nominal frequency of the voltage-controlled active crystal oscillator is controlled within ± 0.125 ppm. Specifically, when the frequency offset control between the current output frequency of the voltage-controlled active crystal oscillator VCXO and the nominal frequency of the voltage-controlled active crystal oscillator is less than-0.125 ppm, the driving voltage output by the voltage adjusting circuit 120 is increased by the voltage adjusting parameter, so that the output frequency of the voltage-controlled active crystal oscillator is increased; when the frequency offset control between the current output frequency of the voltage-controlled active crystal oscillator VCXO and the nominal frequency of the voltage-controlled active crystal oscillator is greater than 0.125ppm, the driving voltage output by the voltage adjusting circuit 120 is reduced by the voltage adjusting parameter, so that the output frequency of the voltage-controlled active crystal oscillator is reduced.
In the actual adjustment process, the output frequency of the voltage-controlled active crystal oscillator VCXO may not be adjusted to a suitable range at one time, and therefore, the measurement and adjustment need to be repeated many times. It should be noted that after each adjustment, the output frequency of the voltage-controlled active crystal oscillator VCXO needs to be detected after the output of the voltage-controlled active crystal oscillator VCXO is stabilized. In addition, the controller 110 sends and stores the adjusted voltage adjustment parameter into the memory 150, and updates the data in the memory 150, so as to ensure that the frequency offset of the output frequency of the active crystal oscillator is within a required range after the adjustment and each restart, and no readjustment is needed.
Based on the same inventive concept, in view of the voltage-controlled active crystal oscillator control apparatus provided in any of the above embodiments, an embodiment of the present invention further provides a control method of a voltage-controlled active crystal oscillator, please refer to fig. 3, where the control method includes:
step S330, receiving the user instruction, and generating a voltage regulation parameter according to the user instruction, wherein the user instruction is input by a user based on the frequency offset between the output frequency of the voltage-controlled active crystal oscillator and the nominal frequency of the voltage-controlled active crystal oscillator;
step S340, adjusting a driving voltage according to the voltage adjustment parameter, and providing the adjusted driving voltage to the voltage-controlled active crystal oscillator, so that a frequency offset between the output frequency and the nominal frequency is within a preset range.
In this embodiment, when the frequency offset between the output frequency and the nominal frequency exceeds a preset range, the user inputs the user instruction based on the frequency offset between the output frequency of the voltage-controlled active crystal oscillator and the nominal frequency of the voltage-controlled active crystal oscillator, so that the controller 110 generates a voltage adjustment parameter according to the user instruction, and sends the voltage adjustment parameter to the voltage adjustment circuit 120, so that the voltage adjustment circuit 120 adjusts the driving voltage according to the voltage adjustment parameter, and provides the adjusted driving voltage to the voltage-controlled active crystal oscillator, thereby making the frequency offset between the output frequency of the voltage-controlled active crystal oscillator and the nominal frequency within the preset range, reducing the frequency difference between the crystal oscillators, improving the problem of asynchronous moving head lamps caused by different output frequencies of the crystal oscillators, and reducing the cost.
In one embodiment, the output frequency of the voltage-controlled active crystal oscillator increases with the increase of the driving voltage.
It will be appreciated that the output frequency of the voltage controlled active crystal VCXO is offset from the nominal frequency by an amount related to the magnitude of the drive voltage applied to its voltage control pin. The tuning voltage corresponding to the nominal frequency of the voltage controlled active crystal VCXO is specified as half VCC (supply voltage). If the supply voltage VCC of the voltage controlled active crystal VCXO is 5V, it should generate a nominal frequency when the driving voltage is 2.5V. The slope of the frequency change curve of the voltage-controlled active crystal oscillator VCXO with the driving voltage range of (0.5-4.5) V is positive, namely, when the driving voltage is increased from 2.5V to 4.5V, the frequency of the oscillator is increased; when the control voltage is reduced from 2.5V to 0.5V, the frequency of the oscillator will decrease.
In one embodiment, the output frequency of the voltage-controlled active crystal oscillator is acquired by a frequency spectrograph or a high-precision oscilloscope. It can be understood that the frequency spectrograph or the high-precision oscilloscope can display the frequency spectrum characteristic of the input signal in the frequency domain, so that a user can conveniently and visually acquire the output frequency of the voltage-controlled active crystal oscillator VCXO. In addition, other instruments having a function of measuring the signal frequency may be used to detect the output frequency, which is not limited in this embodiment.
In one embodiment, the predetermined frequency range is-0.125 to 0.125 ppm.
It will be appreciated that in practical stage control equipment, for example, to reduce costs, the voltage controlled active crystal oscillator commonly used may be a low cost voltage controlled active crystal oscillator VCXO with a nominal frequency accuracy of 20ppm or less, which causes the moving head lamp to be unsynchronized as operating errors accumulate over time. And, the larger the frequency offset between the output frequency and the nominal frequency is, the more serious the asynchronous phenomenon is caused as errors are accumulated continuously during long-time running. Therefore, the frequency offset between the output frequency and the nominal frequency of the voltage-controlled active crystal oscillator needs to be controlled within a reasonable range, so as to ensure that no obvious asynchronization occurs during long-time operation.
Referring to fig. 4, in one embodiment, the method for controlling a voltage-controlled active crystal oscillator further includes:
in step S310, before the output frequency of the voltage-controlled active crystal oscillator is obtained, a preset voltage adjustment parameter is obtained from the memory 150 and sent to the voltage adjustment circuit 120.
It can be understood that, when the voltage-controlled active crystal oscillator control apparatus is initialized, a default voltage adjustment parameter needs to be obtained to control the voltage adjustment circuit 120 to output the driving voltage and provide the driving voltage for the voltage-controlled active crystal oscillator. In this embodiment, the default preset voltage adjustment parameter is initialized and stored in the corresponding memory 150; in addition, the controller 110 may have a storage function and may be stored in its own storage module.
In one embodiment, the method for controlling a voltage-controlled active crystal oscillator further includes:
step S320, obtaining the output frequency of the voltage-controlled active crystal oscillator, so that a user inputs a user instruction based on the frequency offset between the output frequency of the voltage-controlled active crystal oscillator and the nominal frequency of the voltage-controlled active crystal oscillator. Specifically, the output frequency of the voltage-controlled active crystal oscillator may be detected by using a measuring instrument such as a frequency spectrometer or a high-precision oscilloscope.
In one embodiment, the method for controlling a voltage-controlled active crystal oscillator further includes:
step S350, sending the voltage adjustment parameter generated according to the user instruction to the memory 150, and updating the data in the memory 150.
It can be understood that the adjusted voltage regulation parameter is sent to the memory 150 through the controller 110 and stored in the memory 150, and the data in the memory 150 is updated, so that the voltage-controlled active crystal oscillator control device can directly obtain a suitable voltage regulation parameter when being started next time, thereby ensuring that the frequency offset of the output frequency of the active crystal oscillator is within a required range after being restarted every time after being adjusted and normally used, and no adjustment is needed.
In the embodiment, the memory 150 is a non-volatile memory 150, such as an EEPROM (Electrically Erasable and Programmable read only memory 150), a FLASH memory, and an on-chip FLASH of an MCU (micro controller unit).
In order to more clearly describe the control method of the present invention, the following describes the steps of the voltage controlled active crystal oscillator in detail with reference to the voltage controlled active crystal oscillator control apparatus shown in fig. 2. The control method specifically comprises the following steps:
after the power-on, the voltage-controlled active crystal oscillator control device is initialized, the controller 110 reads the preset voltage adjusting parameter from the memory 150, and controls the voltage adjusting circuit 120 to output the driving voltage by using the preset voltage adjusting parameter, so as to provide the driving voltage for the voltage-controlled pin of the voltage-controlled active crystal oscillator VCXO.
And step two, after the output frequency of the voltage-controlled active crystal oscillator VCXO is stable, detecting the output frequency of the current voltage-controlled active crystal oscillator VCXO by utilizing a high-performance measuring instrument 140 such as a frequency spectrograph or a high-precision oscilloscope.
And step three, manually judging whether the actually measured output frequency exceeds or is smaller than the nominal frequency of the voltage-controlled active crystal oscillator and whether the frequency deviation between the output frequency and the nominal frequency is within +/-0.125 ppm. If the frequency deviation between the output frequency and the nominal frequency is within +/-0.125 ppm, executing a fifth step; otherwise, executing step four.
And step four, when the frequency deviation between the output frequency and the nominal frequency exceeds 0.125ppm and the output frequency is less than the nominal frequency, a user inputs a user instruction through the human-computer interaction device 130 so that the controller 110 changes a voltage regulation parameter according to the user instruction, the changed voltage regulation parameter is used for controlling the voltage regulation circuit 120 to increase the output driving voltage and provide the driving voltage to a voltage-controlled pin of the voltage-controlled active crystal oscillator VCXO, and therefore the output frequency of the voltage-controlled active crystal oscillator VCXO is increased, and the frequency deviation between the output frequency and the nominal frequency is controlled within a preset range. Similarly, when the frequency offset between the output frequency and the nominal frequency exceeds 0.125ppm and the output frequency is greater than the nominal frequency, the user inputs a user instruction through the human-computer interaction device 130, so that the controller 110 changes the voltage adjustment parameter according to the user instruction, thereby reducing the driving voltage output by the voltage adjustment circuit 120 and providing the driving voltage to the voltage-controlled pin of the voltage-controlled active crystal oscillator VCXO, thereby reducing the output frequency of the voltage-controlled active crystal oscillator VCXO and controlling the frequency offset between the output frequency and the nominal frequency within the preset range. And then returning to the second step until the frequency deviation between the output frequency and the nominal frequency is controlled within +/-0.125 ppm.
Based on the same inventive concept, the embodiment of the present invention further provides a stage moving head light fixture, please refer to fig. 5, which includes a stepping motor 10, a motor control board 20, a light source (not shown), a rotating device (not shown), and the like.
The motor control board 20 is electrically connected to the stepping motor 10, and is used for controlling the rotation of the rotating device.
The motor control board 20 includes a motor driving circuit 201 and a crystal control circuit 202, wherein the motor driving circuit 201 is electrically connected to a controller inside the crystal control circuit 202 and is directly controlled by the controller.
The crystal oscillator control circuit 202 includes a controller, a voltage adjusting circuit, and a voltage-controlled active crystal oscillator, and an output clock of the voltage-controlled active crystal oscillator is a main operating clock of the controller. The controller is used for receiving a user instruction and generating a voltage regulation parameter according to the user instruction, wherein the user instruction is input by a user based on the frequency offset between the output frequency of the voltage-controlled active crystal oscillator and the nominal frequency of the voltage-controlled active crystal oscillator; the voltage adjusting circuit is electrically connected with the controller and used for receiving and adjusting the driving voltage according to the voltage adjusting parameter and providing the adjusted driving voltage for the voltage-controlled active crystal oscillator so as to enable the frequency deviation of the output frequency and the nominal frequency to be within a preset range.
In one embodiment, the crystal oscillator control circuit further comprises a memory electrically connected to the controller for storing preset voltage regulation parameters.
The controller is further configured to obtain the preset voltage adjustment parameter from the memory and send the preset voltage adjustment parameter to the voltage adjustment circuit before receiving a user instruction; and sending the voltage regulation parameter generated according to the user instruction to the memory, and updating the data in the memory.
In this embodiment, the crystal oscillator control circuit 202 composed of the controller, the memory, the voltage adjusting circuit, and the voltage controlled active crystal oscillator is a high-precision crystal oscillator control circuit, and the high-precision crystal oscillator control circuit 202 is a high-precision crystal oscillator control circuit in the voltage controlled active crystal oscillator control device shown in fig. 2.
In summary, the embodiment of the invention provides a voltage-controlled active crystal oscillator control device and method and a stage moving head lamp. Wherein the apparatus comprises a controller and a voltage regulation circuit. The controller is used for receiving a user instruction and generating a voltage regulation parameter according to the user instruction, wherein the user instruction is input by a user based on the frequency offset between the output frequency of the voltage-controlled active crystal oscillator and the nominal frequency of the voltage-controlled active crystal oscillator; the voltage adjusting circuit is electrically connected with the controller and used for receiving and adjusting the driving voltage according to the voltage adjusting parameter and providing the adjusted driving voltage for the voltage-controlled active crystal oscillator so as to enable the frequency deviation between the output frequency and the nominal frequency to be within a preset range. In the invention, the voltage regulating parameter is generated by the controller according to the user instruction and is sent to the voltage regulating circuit, so that the voltage regulating circuit regulates the driving voltage according to the voltage regulating parameter and provides the regulated driving voltage to the voltage-controlled active crystal oscillator, further, the frequency deviation between the output frequency and the nominal frequency of the voltage-controlled active crystal oscillator is in a preset range, the frequency difference between the crystal oscillators is reduced, and the problem of asynchronization caused by different output frequencies of the crystal oscillators is solved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (14)
1. A voltage-controlled active crystal oscillator control device, comprising:
the controller is used for receiving a user instruction and generating a voltage regulation parameter according to the user instruction, wherein the user instruction is input by a user based on the frequency offset between the output frequency of the voltage-controlled active crystal oscillator and the nominal frequency of the voltage-controlled active crystal oscillator; and
and the voltage adjusting circuit is electrically connected with the controller and used for receiving and adjusting the driving voltage according to the voltage adjusting parameter and providing the adjusted driving voltage for the voltage-controlled active crystal oscillator so as to enable the frequency deviation between the output frequency and the nominal frequency to be within a preset range.
2. The voltage controlled active crystal oscillator control device of claim 1, wherein the predetermined frequency range is-0.125 to 0.125 ppm.
3. The voltage controlled active crystal oscillator control apparatus of claim 1, further comprising a human-machine interaction device electrically connected to said controller for inputting said user command.
4. The voltage controlled active crystal oscillator control apparatus of claim 3, wherein the human-computer interaction device is an upper computer, a control button or a control panel.
5. The apparatus of claim 1, further comprising a measurement instrument electrically connected to the voltage controlled active crystal oscillator for detecting an output frequency of the voltage controlled active crystal oscillator.
6. The voltage controlled active crystal oscillator control apparatus of claim 5, wherein the measurement instrument is a spectrometer or a high precision oscilloscope.
7. The voltage controlled active crystal oscillator control apparatus of claim 1, further comprising:
the memory is electrically connected with the controller and used for storing preset voltage regulation parameters;
the controller is further configured to obtain the preset voltage adjustment parameter from the memory and send the preset voltage adjustment parameter to the voltage adjustment circuit before receiving a user instruction; and sending the voltage regulation parameter generated according to the user instruction to the memory, and updating the data in the memory.
8. The voltage controlled active crystal oscillator control device of claim 1, wherein the controller is a micro control unit, a central processing unit, a digital signal processing, or a programmable logic device.
9. A control method of a voltage-controlled active crystal oscillator is characterized by comprising the following steps:
receiving a user instruction, and generating a voltage regulation parameter according to the user instruction, wherein the user instruction is input by a user based on the frequency offset between the output frequency of the voltage-controlled active crystal oscillator and the nominal frequency of the voltage-controlled active crystal oscillator;
and adjusting the driving voltage according to the voltage adjusting parameter, and providing the adjusted driving voltage for the voltage-controlled active crystal oscillator so as to enable the frequency deviation between the output frequency and the nominal frequency to be within a preset range.
10. The control method of claim 9, wherein an output frequency of the voltage controlled active crystal oscillator increases with an increase in the driving voltage.
11. The control method according to claim 9, further comprising: and before the output frequency of the voltage-controlled active crystal oscillator is obtained, obtaining preset voltage adjusting parameters from a memory and sending the preset voltage adjusting parameters to the voltage adjusting circuit.
12. The control method according to claim 11, further comprising:
and sending the voltage regulation parameter generated according to the user instruction to the memory, and updating the data in the memory.
13. A stage moving head light fixture, comprising:
the stepping motor is used for driving the rotating device to rotate; and
the motor control board is electrically connected with the stepping motor and is used for controlling the rotation of the moving head lamp;
the motor control board comprises a motor driving circuit and a crystal oscillator control circuit;
the crystal oscillator control circuit comprises a voltage-controlled active crystal oscillator, a controller and a voltage regulating circuit; the controller is used for receiving a user instruction and generating a voltage regulation parameter according to the user instruction, wherein the user instruction is input by a user based on the frequency offset between the output frequency of the voltage-controlled active crystal oscillator and the nominal frequency of the voltage-controlled active crystal oscillator; the voltage adjusting circuit is electrically connected with the controller and used for receiving and adjusting the driving voltage according to the voltage adjusting parameter and providing the adjusted driving voltage for the voltage-controlled active crystal oscillator so as to enable the frequency deviation of the output frequency and the nominal frequency to be within a preset range;
the motor driving circuit is electrically connected with a controller in the crystal oscillator control circuit and is directly controlled by the controller.
14. A stage moving head light fixture according to claim 13, wherein the crystal control circuit further comprises:
the memory is electrically connected with the controller and used for storing preset voltage regulation parameters;
the controller is further configured to obtain the preset voltage adjustment parameter from the memory and send the preset voltage adjustment parameter to the voltage adjustment circuit before receiving a user instruction; and sending the voltage regulation parameter generated according to the user instruction to the memory, and updating the data in the memory.
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| CN202010455913.8A CN111600570A (en) | 2020-05-26 | 2020-05-26 | Pressure-controlled active crystal oscillator control device and method and stage oscillating lamp |
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| CN202010455913.8A CN111600570A (en) | 2020-05-26 | 2020-05-26 | Pressure-controlled active crystal oscillator control device and method and stage oscillating lamp |
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