CN110212773B - Voltage switching method and device for high-voltage generator, computer equipment and storage medium - Google Patents
Voltage switching method and device for high-voltage generator, computer equipment and storage medium Download PDFInfo
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- CN110212773B CN110212773B CN201910500645.4A CN201910500645A CN110212773B CN 110212773 B CN110212773 B CN 110212773B CN 201910500645 A CN201910500645 A CN 201910500645A CN 110212773 B CN110212773 B CN 110212773B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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Abstract
The application relates to a voltage switching method and device for a high-voltage generator, computer equipment and a storage medium. The method comprises the following steps: acquiring a voltage modulation mode and a voltage switching instruction of a high-voltage generator; regulating a modulation parameter corresponding to the voltage modulation mode to a preset parameter value by adopting segmented feedforward according to the voltage modulation mode and a voltage switching instruction; and if the high-voltage generator finishes voltage switching, controlling the voltage to maintain a stable state by using a PID control mode. Through the adjusting mode of the segmented feedforward, the modulating parameter corresponding to the voltage modulating mode is directly adjusted to the preset parameter, the fast switching between high voltage and low voltage can be realized, and the voltage overshoot condition caused by the larger inertia of the system can be avoided when the control is carried out by a simple PID control mode.
Description
Technical Field
The present application relates to the field of medical equipment technologies, and in particular, to a method and an apparatus for switching a voltage of a high voltage generator, a computer device, and a storage medium.
Background
In recent years, X-ray Computed Tomography (CT) has been greatly developed in both basic technology and new clinical applications, and has become one of the most exciting diagnostic methods in the field of medical images. In CT, dual energy imaging obtains material characteristics and reduces artifacts by scanning the scanned object twice at different voltage energy levels. The energy imaging based on the quick switching of high and low kV has the advantages of simultaneous, homologous and homodromous, and is an attractive energy imaging mode. In a specific implementation, the high voltage generator output voltage is at a low energy kV (kV)lUsually between 70 and 100 kV) and high energy kV (kV)hTypically 120-150 kV), the sum of the duration of one high energy kV and one low energy kV is typically only a few hundred mus, and the emitted low energy X-rays and high energy X-rays impinge upon the array of detectors after being attenuated by the object to generate the image.
In the prior art, the output voltage is effectively regulated in a PID control mode, and the purpose of controlling the output voltage is achieved by comparing the difference value of the reference voltage and the actual feedback voltage. In practical application, the PID control parameters need to be continuously debugged according to circuit conditions by adopting the control mode, and meanwhile, when the high-low kV voltage switching is realized, the fastest voltage switching speed cannot be achieved or large voltage overshoot is caused by large system inertia if a simple PID control mode is adopted.
Disclosure of Invention
In view of the above, there is a need to provide a voltage switching method, apparatus, computer device and storage medium for a high voltage generator, which can switch voltage quickly while avoiding voltage overshoot.
A high voltage generator voltage switching method, the method comprising: acquiring a voltage modulation mode and a voltage switching instruction of a high-voltage generator; regulating a modulation parameter corresponding to the voltage modulation mode to a preset parameter value by adopting segmented feedforward according to the voltage modulation mode and a voltage switching instruction; and if the high-voltage generator finishes voltage switching, controlling the voltage to maintain a stable state by using a PID control mode.
In one embodiment, the voltage modulation mode comprises: a variable pulse width modulation mode and a variable frequency modulation mode; the voltage switching instructions include: a voltage switch up command and a voltage switch down command.
In one embodiment, the adjusting, according to the voltage modulation mode and the voltage switching instruction, the modulation parameter corresponding to the voltage modulation mode to a preset parameter value by using segmented feedforward includes: if the voltage modulation mode is a variable pulse width modulation mode, and the voltage switching instruction is a voltage switching rising instruction; and adjusting the duty ratio of the switching pulse to a first preset parameter according to the variable pulse width modulation mode and the voltage switching rising instruction.
In one embodiment, the adjusting, according to the voltage modulation mode and the voltage switching instruction, the modulation parameter corresponding to the voltage modulation mode to a preset parameter value by using segmented feedforward includes: if the voltage modulation mode is a variable pulse width modulation mode, and the voltage switching instruction is a voltage switching descending instruction; and adjusting the duty ratio of the switching pulse to a second preset parameter according to the variable pulse width modulation mode and the voltage switching descending instruction.
In one embodiment, the adjusting, according to the voltage modulation mode and the voltage switching instruction, the modulation parameter corresponding to the voltage modulation mode to a preset parameter value by using segmented feedforward includes: if the voltage modulation mode is a variable frequency modulation mode, and the voltage switching instruction is a voltage switching ascending instruction; and adjusting the switching pulse frequency to a third preset parameter according to the variable frequency modulation mode and the voltage switching ascending instruction.
In one embodiment, the adjusting, according to the voltage modulation mode and the voltage switching instruction, the modulation parameter corresponding to the voltage modulation mode to a preset parameter value by using segmented feedforward includes: if the voltage modulation mode is a variable frequency modulation mode, and the voltage switching instruction is a voltage switching descending instruction; and stopping driving the switching pulse according to the variable frequency modulation mode and the voltage switching descending instruction.
In one embodiment, the step of switching the voltage if the high voltage generator completes the voltage switching includes: acquiring the output voltage of a high-voltage generator; when the voltage switching instruction is a voltage switching rising instruction and the output voltage is greater than or equal to a high-voltage mode voltage with a first preset proportion, the high-voltage generator completes voltage switching; and when the voltage switching instruction is a voltage switching descending instruction and the output voltage is less than or equal to the low-voltage mode voltage of a second preset proportion, the high-voltage generator completes voltage switching.
A high voltage generator voltage switching apparatus, the apparatus comprising: the acquisition module is used for acquiring a voltage modulation mode and a voltage switching instruction of the high-voltage generator; the adjusting module is used for adjusting the modulation parameters corresponding to the voltage modulation mode to preset parameter values by adopting segmented feedforward according to the voltage modulation mode and the voltage switching instruction; and the steady state maintaining module is used for controlling the voltage to maintain a steady state by utilizing a PID control mode if the high-voltage generator finishes voltage switching.
A computer device comprising a memory storing a computer program and a processor implementing the steps of any of the methods described above when the computer program is executed.
A computer-readable storage medium, having stored thereon a computer program which, when being executed by a processor, carries out the steps of the method of any of the above.
According to the voltage switching method, the voltage modulation mode and the voltage switching instruction of the high-voltage generator are obtained, the modulation parameters corresponding to the voltage modulation mode are adjusted to the preset parameters in a segmented feedforward mode according to the voltage modulation mode and the voltage switching instruction, and after the voltage switching is finished, the voltage is controlled to maintain a stable state in a PID control mode. Through the adjusting mode of the segmented feedforward, the modulating parameter corresponding to the voltage modulating mode is directly adjusted to the preset parameter, the fast switching between high voltage and low voltage can be realized, and the voltage overshoot condition caused by the larger inertia of the system can be avoided when the control is carried out by a simple PID control mode.
Drawings
FIG. 1 is an equivalent circuit diagram of a high voltage generator in one embodiment;
FIG. 2 is a voltage transformation diagram of ideal high and low voltage switching in one embodiment;
FIG. 3 is a schematic diagram of single voltage ring PID control in one embodiment;
FIG. 4 is a schematic diagram of voltage-current dual closed loop PID control in one embodiment;
FIG. 5 is a schematic diagram of a single voltage ring PID control with the addition of a feedforward controller in one embodiment;
FIG. 6 is a schematic diagram of voltage-current dual closed loop PID control after addition of a feedforward controller in one embodiment;
FIG. 7 is a voltage transition diagram illustrating too slow switching of high and low voltages in one embodiment;
FIG. 8 is a schematic diagram of voltage transitions with overshoot for high and low voltage switching in one embodiment;
FIG. 9 is a schematic flow chart of a method for switching the voltage of the high voltage generator according to one embodiment;
FIG. 10 is a piecewise schematic of piecewise feedforward in one embodiment;
FIG. 11 is a schematic flow chart illustrating a method for switching voltage of the high voltage generator according to an embodiment;
FIG. 12 is a schematic flow chart of a voltage switching method for a high voltage generator according to another embodiment;
FIG. 13 is a schematic flow chart of a voltage switching method for a high voltage generator according to another embodiment;
FIG. 14 is a schematic flow chart of a voltage switching method for a high voltage generator according to another embodiment;
FIG. 15 is a block diagram of a high voltage generator voltage switching device in one embodiment;
FIG. 16 is a diagram illustrating an internal structure of a computer device according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
A Computed Tomography (CT) apparatus typically includes a gantry, a couch, and a console for operation by a physician. One side of the frame is provided with a bulb tube, and the side opposite to the bulb tube is provided with a detector. The console is a computer device for controlling the bulb tube and the detector to scan, and the computer device is also used for receiving data collected by the detector, processing and reconstructing the data and finally forming a CT image. When CT is used for scanning, a patient lies on a scanning bed, the scanning bed sends the patient into the aperture of a stand, a bulb tube arranged on the stand emits X rays, the X rays penetrate through the patient and are received by a detector to form data, the data are transmitted to computer equipment, and the computer equipment carries out primary processing and image reconstruction on the data to obtain a CT image.
The dual-energy computed tomography equipment can analyze the components of the substance by utilizing different absorption characteristics of the substance to X-rays at different energy levels, thereby improving the developing capability of the dual-energy computed tomography equipment to soft tissues and having very high clinical application value. The quick kilovolt switching of the single-source CT is used as one of the dual-energy CT, has the advantages of being simultaneous, homologous, homodromous and the like compared with the traditional dual-source CT, and is a dual-energy imaging method with excellent performance.
The bulb tube and the high voltage generator are the main components of the X-ray machine and the X-ray CT. The high voltage generator raises the input AC voltage by hundreds of times, and then the DC voltage required by X-ray generation is provided for the bulb tube after rectification. The bulb receives the voltage transmitted by the high voltage generator, and uses the voltage to heat the cathode filament to generate thermal electrons, and uses the bombardment of the thermal electrons on the anode target disk to generate X rays. Because the output power of the high-voltage generator is as high as hundreds of kilowatts, and only less than 1 percent of energy of thermal electrons can be converted into X rays to be emitted, the rest energy of over 99 percent can be accumulated on the anode target plate in a thermal energy mode.
An equivalent schematic diagram of the high-voltage generator is shown in fig. 1, and generally has a resonant circuit structure, and includes a three-phase uncontrolled rectifying unit, a filtering unit, an inverting unit, a high-voltage transformer unit, and a high-voltage rectifying and filtering unit, which are connected in sequence, and the high-voltage rectifying and filtering unit is finally connected to a bulb tube load through a high-voltage cable. And the output voltage is controlled by adopting a variable Pulse Width Modulation (PWM) or variable frequency modulation (PFM) mode. The pulse width modulation PWM is changed, and the resonant converter adjusts output voltage by adjusting the duty ratio of the conduction of a switching tube of the bridge inverter circuit at a fixed switching frequency; the PFM is modulated by the variable frequency, and the resonant converter regulates the output voltage by controlling the switching frequency of a switching tube of the bridge inverter circuit. Wherein the ideal fast switching voltage is shown in figure 2.
In dual energy computed tomography devices based on fast switching of high and low energy level voltages, the output voltage of the high voltage generator must be switched between low and high voltages as fast as possible to enhance the spectral discrimination during low and high energy level imaging to obtain better material discrimination. However, due to circuit factors, the low-level voltage and the high-level voltage have a certain transition time during switching, and the sum of the duration of one low-level voltage and the duration of one high-level voltage is usually only hundreds of microseconds. On the other hand, the high voltage generator of the dual energy computed tomography apparatus needs to meet the operation requirement under the condition of wide range of load current, which further increases the control difficulty of the switching process of the low-level voltage and the high-level voltage.
In the prior art, as shown in fig. 3-6, fig. 3 is a schematic diagram of single voltage ring PID control in an embodiment, fig. 4 is a schematic diagram of voltage and current double closed loop PID control in an embodiment, fig. 5 is a schematic diagram of single voltage ring PID control after a feedforward controller is added in an embodiment, and fig. 6 is a schematic diagram of voltage and current double closed loop PID control after a feedforward controller is added in an embodiment. The single voltage ring PID control mode achieves the purpose of controlling the output voltage by comparing the difference value of the reference voltage and the actual feedback voltage, and the switching of the output voltage between the low-energy voltage and the high-energy voltage can be realized after the reference waveform of the output voltage is set to be square wave. The voltage and current double closed loop PID control mode is to add current inner loop control of resonant cavity current on the basis of single voltage outer loop, so as to improve the control characteristic of the converter. In order to further improve the control performance of the converter, the high voltage generator in practical application may further add a feedforward control link on the basis of the single voltage loop PID control manner and the voltage and current dual closed loop PID control manner, as shown in fig. 5 and 6. Compared with feedback control, the feedforward controller does not need to act after errors are generated between the output and the reference quantity, and the response speed of the system is improved. However, due to the lack of accurate mathematical models of the resonant circuit and the high-voltage rectification part, in practical application, the control method needs to debug PID control parameters continuously according to circuit conditions, and the fastest voltage switching speed cannot be achieved or large voltage overshoot is caused by large inertia of the system when high-low level voltage conversion is realized. As shown in fig. 7 and 8, fig. 7 is a voltage transformation diagram illustrating that the high-low voltage switches are too slow in one embodiment, and fig. 8 is a voltage transformation diagram illustrating that the high-low voltage switches are overshot in one embodiment.
In one embodiment, as shown in fig. 9, there is provided a high voltage generator voltage switching method comprising the steps of:
step S102, acquiring a voltage modulation mode and a voltage switching command of the high-voltage generator.
In particular, the voltage switching method of the high voltage generator can be applied to dual-energy imaging of the dual-energy computed tomography device, can also be applied to switching of voltage in the high-power pulse generator, and can also be applied to scenes such as rapid rising and falling of the high voltage output by the modulator in the radiotherapy device. In the present embodiment, dual-energy imaging applied to a dual-energy computed tomography apparatus is described as an example. In the dual-energy computed tomography device, during the dual-energy imaging process, the central controller of the dual-energy computed tomography device needs to perform data communication with the central controller of the high-voltage generator, that is, the dual-energy computed tomography device sends a voltage switching instruction to the high-voltage generator, where the voltage switching instruction includes: a voltage switch up command and a voltage switch down command. A voltage switching rising instruction is used for switching the high-voltage generator from low-level voltage to high-level voltage; and a voltage switching descending instruction enables the high-voltage generator to be switched from the high-level voltage to the low-level voltage. The voltage modulation modes include: a variable pulse width modulation mode PWM and a variable frequency modulation mode PFM. In a high voltage generator, the magnitude of the output voltage is directly related to both the switching duty cycle and the switching frequency. More specifically, the variable pulse width modulation mode PWM fixes the switching frequency and regulates the output voltage by regulating the duty cycle. The variable frequency modulation mode PFM fixes the duty cycle and adjusts the output voltage by adjusting the switching frequency.
And step S104, adjusting the modulation parameter corresponding to the voltage modulation mode to a preset parameter value by adopting segmented feedforward according to the voltage modulation mode and the voltage switching instruction.
Specifically, the voltage switching method of this embodiment has the same control concept in the variable Pulse Width Modulation (PWM) mode and the variable frequency modulation (PFM) mode, that is, the segmented feedforward control, and achieves the purpose of controlling the output voltage by controlling corresponding parameters in different voltage modulation modes. Under a variable Pulse Width Modulation (PWM) mode, the switching frequency is fixed, and the duty ratio is adjusted to a preset parameter value in a segmented feed-forward mode to achieve the purpose of adjusting the output voltage; under the frequency conversion modulation mode PFM, the duty ratio is fixed, and the switching frequency is adjusted to a preset parameter value in a segmented feedforward mode, so that the purpose of adjusting the output voltage is achieved. Namely, the modulation parameter is the duty ratio in the variable pulse width modulation mode PWM; in the variable frequency modulation mode PFM the modulation parameter is the switching frequency. The preset parameters are specifically set according to actual use conditions. Presetting parameters in a variable pulse width modulation mode PWM as the value of the duty ratio of switching pulses; the preset parameter in the frequency-variable modulation mode PFM is a value of the switching pulse frequency.
And step S106, if the high-voltage generator finishes voltage switching, controlling the voltage to maintain a steady state by using a PID control mode.
Specifically, the output voltage of a high-voltage generator is obtained, and when the voltage switching instruction is a voltage switching rising instruction and the output voltage is greater than or equal to a high-voltage mode voltage of a first preset proportion, the high-voltage generator completes voltage switching; and when the voltage switching instruction is a voltage switching descending instruction and the output voltage is less than or equal to the low-voltage mode voltage of a second preset proportion, the high-voltage generator completes voltage switching. More specifically, when the low-level voltage is switched to the high-level voltage, when the output voltage is higher than 90% of the high-level mode voltage, or other preset proportion, it is determined that the conversion from the low-level voltage to the high-level voltage is completed; when the high-level voltage is switched to the low-level voltage, when the output voltage is lower than 110% of the low-level mode voltage, or other preset proportion, it is determined that the conversion from the high-level voltage to the low-level voltage is completed. After the voltage switching is completed, the voltage is controlled to maintain a steady state in a PID control mode. Wherein the PID control mode comprises: a single voltage ring PID control mode and a voltage and current double closed loop PID control mode. The PID control mode is that according to the output voltage, when the output voltage is higher than a preset value, the corresponding parameter (duty ratio or switching frequency) is adjusted to reduce the output voltage, when the output voltage is lower than the preset value, the corresponding parameter (duty ratio or switching frequency) is adjusted to increase the output voltage, and finally, the dynamic balance state is entered.
According to the voltage switching method of the high-voltage generator, the voltage modulation mode and the voltage switching instruction of the high-voltage generator are obtained, the modulation parameters corresponding to the voltage modulation mode are adjusted to the preset parameters in a segmented feedforward mode according to the voltage modulation mode and the voltage switching instruction, and after the voltage switching is finished, the voltage is controlled to maintain a stable state in a PID control mode. Through the adjusting mode of the segmented feedforward, the modulating parameter corresponding to the voltage modulating mode is directly adjusted to the preset parameter, the fast switching between high voltage and low voltage can be realized, and the voltage overshoot condition caused by the larger inertia of the system can be avoided when the control is carried out by a simple PID control mode.
In one embodiment, if the voltage modulation mode is a variable pulse width modulation mode, and the voltage switching command is a voltage switching rise command; and adjusting the duty ratio of the switching pulse to a first preset parameter according to the variable pulse width modulation mode and the voltage switching rising instruction.
Specifically, in the variable pulse width modulation mode, when the low-level voltage is switched to the high-level voltage, the duty ratio of the switching pulse is adjusted to a first preset parameter in the voltage rising stage, wherein the first preset parameter is the duty ratio of the switching pulse required by the high-level voltage.
In one embodiment, if the voltage modulation mode is a variable pulse width modulation mode and the voltage switching command is a voltage switching down command; and adjusting the duty ratio of the switching pulse to a second preset parameter according to the variable pulse width modulation mode and the voltage switching descending instruction.
Specifically, in the variable pulse width modulation mode, when the high-level voltage is switched to the low-level voltage, the duty ratio of the switching pulse is adjusted to a second preset parameter in the voltage reduction stage, wherein the second preset parameter is the duty ratio of the switching pulse required by the low-level voltage.
In one embodiment, if the voltage modulation mode is a variable frequency modulation mode, and the voltage switching command is a voltage switching rise command; and adjusting the switching pulse frequency to a third preset parameter according to the variable frequency modulation mode and the voltage switching ascending instruction.
Specifically, in the variable frequency modulation mode, when the low-level voltage is switched to the high-level voltage, the switching pulse frequency is adjusted to a third preset parameter at the voltage rising stage, wherein the third preset parameter is the switching pulse frequency required by the high-level voltage.
In one embodiment, if the voltage modulation mode is a variable frequency modulation mode, and the voltage switching command is a voltage switching down command; and stopping driving the switching pulse according to the variable frequency modulation mode and the voltage switching descending instruction.
Specifically, when the high-level voltage is switched to the low-level voltage in the frequency conversion modulation mode, the driving of the switching pulse is stopped in the voltage drop stage.
In one embodiment, as shown in FIG. 10, FIG. 10 is a piecewise schematic diagram of piecewise feedforward in one embodiment. The high-low level voltage switching process of the dual-energy computed tomography device is divided into four stages: the stage 1 is a voltage rising stage for switching low-level voltage to high-level voltage; stage 2 is a high-level voltage platform stage; stage 3 is a voltage reduction stage in which the high-level voltage is switched to the low-level voltage; stage 4 is a plateau stage for low level voltages.
In one embodiment, as shown in FIG. 11, FIG. 11 illustrates a method for switching the voltage of the high voltage generator in one embodiment. In the present embodiment, a variable pulse width modulation PWM and a single voltage ring PID control are exemplified. The resonant converter is in a variable Pulse Width Modulation (PWM) mode, whether a voltage switching rising instruction is received or not is judged at a voltage rising stage of a stage 1, if the voltage switching rising instruction is received, the duty ratio of the switching pulse is suddenly changed, namely the duty ratio of the switching pulse is adjusted to a first preset parameter, and the output voltage is rapidly raised. And judging whether the voltage rising stage is finished, and if the output voltage is higher than 90% of the high-voltage mode voltage and can be other preset proportions, determining that the conversion from the low-level voltage to the high-level voltage is finished. And in the stage 2, the voltage is controlled by the single voltage ring PID to maintain a stable state, so that the output voltage enters a high-energy-level voltage stable state. And judging whether a voltage switching descending instruction is received or not in the voltage descending stage of the stage 3, and if the voltage switching descending instruction is received, suddenly changing the duty ratio of the switching pulse, namely, adjusting the duty ratio of the switching pulse to a second preset parameter, and rapidly descending the output voltage. Preferably the second predetermined parameter is zero. And judging whether the voltage reduction stage is finished, and if the output voltage is lower than 110% of the low-voltage mode voltage and can be other preset proportions, determining that the conversion from the high-level voltage to the low-level voltage is finished. And in the stage 4, the voltage is controlled by the single voltage ring PID to maintain a stable state, so that the output voltage enters a low-level voltage stable state. The single voltage loop PID control may also be a single voltage loop PID control added with a feedforward controller.
In one embodiment, as shown in FIG. 12, FIG. 12 is a method for switching the voltage of the high voltage generator in one embodiment. In the present embodiment, a variable pulse width modulation PWM and a voltage-current dual closed loop PID control are exemplified. The resonant converter is in a variable Pulse Width Modulation (PWM) mode, whether a voltage switching rising instruction is received or not is judged at a voltage rising stage of a stage 1, if the voltage switching rising instruction is received, the duty ratio of the switching pulse is suddenly changed, namely the duty ratio of the switching pulse is adjusted to a first preset parameter, and the output voltage is rapidly raised. And judging whether the voltage rising stage is finished, and if the output voltage is higher than 90% of the high-voltage mode voltage and can be other preset proportions, determining that the conversion from the low-level voltage to the high-level voltage is finished. And entering a stage 2, controlling the voltage to maintain a stable state by using the voltage current double closed loop PID, and enabling the output voltage to enter a high-energy-level voltage stable state. And judging whether a voltage switching descending instruction is received or not in the voltage descending stage of the stage 3, and if the voltage switching descending instruction is received, suddenly changing the duty ratio of the switching pulse, namely, adjusting the duty ratio of the switching pulse to a second preset parameter, and rapidly descending the output voltage. Preferably the second predetermined parameter is zero. And judging whether the voltage reduction stage is finished, and if the output voltage is lower than 110% of the low-voltage mode voltage and can be other preset proportions, determining that the conversion from the high-level voltage to the low-level voltage is finished. And entering a stage 4, controlling the voltage to maintain a stable state by using the voltage and current double closed loop PID, and enabling the output voltage to enter a low-level voltage stable state. The voltage and current double-closed-loop PID control can also be voltage and current double-closed-loop PID control for increasing the feedforward controller.
In one embodiment, as shown in FIG. 13, FIG. 13 is a method for switching the voltage of the high voltage generator in one embodiment. In the present embodiment, the frequency modulation mode PFM and the single voltage loop PID control are exemplified. The resonant converter is in a frequency conversion modulation mode PFM, whether a voltage switching rising instruction is received or not is judged in a stage 1 voltage rising stage, and if the voltage switching rising instruction is received, the switching pulse frequency is suddenly changed, namely the switching pulse frequency is adjusted to a third preset parameter, and the output voltage rises rapidly. And judging whether the voltage rising stage is finished, and if the output voltage is higher than 90% of the high-voltage mode voltage and can be other preset proportions, determining that the conversion from the low-level voltage to the high-level voltage is finished. And in the stage 2, the voltage is controlled by the single voltage ring PID to maintain a stable state, so that the output voltage enters a high-energy-level voltage stable state. And judging whether a voltage switching descending instruction is received or not in the voltage descending stage of the stage 3, if the voltage switching descending instruction is received, turning off the driving pulses of all the switching tubes of the inverter circuit, and rapidly descending the output voltage. And judging whether the voltage reduction stage is finished, and if the output voltage is lower than 110% of the low-voltage mode voltage and can be other preset proportions, determining that the conversion from the high-level voltage to the low-level voltage is finished. And in the stage 4, the voltage is controlled by the single voltage ring PID to maintain a stable state, so that the output voltage enters a low-level voltage stable state. The single voltage loop PID control may also be a single voltage loop PID control added with a feedforward controller.
In one embodiment, as shown in fig. 14, fig. 14 is a method for switching the voltage of the high voltage generator in one embodiment. In the present embodiment, a frequency modulation mode PFM and a voltage-current dual closed loop PID control are exemplified. The resonant converter is in a frequency conversion modulation mode PFM, whether a voltage switching rising instruction is received or not is judged in a stage 1 voltage rising stage, and if the voltage switching rising instruction is received, the switching pulse frequency is suddenly changed, namely the switching pulse frequency is adjusted to a third preset parameter, and the output voltage rises rapidly. And judging whether the voltage rising stage is finished, and if the output voltage is higher than 90% of the high-voltage mode voltage and can be other preset proportions, determining that the conversion from the low-level voltage to the high-level voltage is finished. And entering a stage 2, controlling the voltage to maintain a stable state by using the voltage current double closed loop PID, and enabling the output voltage to enter a high-energy-level voltage stable state. And judging whether a voltage switching descending instruction is received or not in the voltage descending stage of the stage 3, if the voltage switching descending instruction is received, turning off the driving pulses of all the switching tubes of the inverter circuit, and rapidly descending the output voltage. And judging whether the voltage reduction stage is finished, and if the output voltage is lower than 110% of the low-voltage mode voltage and can be other preset proportions, determining that the conversion from the high-level voltage to the low-level voltage is finished. And entering a stage 4, controlling the voltage to maintain a stable state by using the voltage and current double closed loop PID, and enabling the output voltage to enter a low-level voltage stable state. The voltage and current double-closed-loop PID control can also be voltage and current double-closed-loop PID control for increasing the feedforward controller.
It should be understood that, although the steps in the flowchart of fig. 9 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 9 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
In one embodiment, as shown in fig. 15, there is provided a high voltage generator voltage switching device comprising: an acquisition module 100, a regulation module 200, and a steady-state maintenance module 300, wherein:
the obtaining module 100 is configured to obtain a voltage modulation mode and a voltage switching instruction of the high voltage generator.
And the adjusting module 200 is configured to adjust the modulation parameter corresponding to the voltage modulation mode to a preset parameter value by using segmented feedforward according to the voltage modulation mode and the voltage switching instruction.
And a steady state maintaining module 300, configured to control the voltage to maintain a steady state in a PID control manner if the high voltage generator completes voltage switching.
The adjusting module 200 is further configured to adjust a duty ratio of the switching pulse to a first preset parameter according to the variable pulse width modulation mode and the voltage switching rising instruction.
The adjusting module 200 is further configured to adjust the duty ratio of the switching pulse to a second preset parameter according to the variable pulse width modulation mode and the voltage switching reduction instruction.
The adjusting module 200 is further configured to adjust the switching pulse frequency to a third preset parameter according to the variable frequency modulation mode and the voltage switching rising instruction.
The adjusting module 200 is further configured to stop driving the switching pulse according to the variable frequency modulation mode and the voltage switching reduction instruction.
The steady state maintaining module 300 is further used for acquiring the output voltage of the high voltage generator; when the voltage switching instruction is a voltage switching rising instruction and the output voltage is greater than or equal to a high-voltage mode voltage with a first preset proportion, the high-voltage generator completes voltage switching; and when the voltage switching instruction is a voltage switching descending instruction and the output voltage is less than or equal to the low-voltage mode voltage of a second preset proportion, the high-voltage generator completes voltage switching.
For specific limitations of the high voltage generator voltage switching device, reference may be made to the above limitations of the high voltage generator voltage switching method, which are not described herein again. The modules in the voltage switching device of the high-voltage generator can be wholly or partially realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as shown in fig. 16. The computer device includes a processor, a memory, a network interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a high voltage generator voltage switching method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.
Those skilled in the art will appreciate that the architecture shown in fig. 16 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having a computer program stored therein, the processor implementing the following steps when executing the computer program:
acquiring a voltage modulation mode and a voltage switching instruction of a high-voltage generator; regulating a modulation parameter corresponding to the voltage modulation mode to a preset parameter value by adopting segmented feedforward according to the voltage modulation mode and a voltage switching instruction; and if the high-voltage generator finishes voltage switching, controlling the voltage to maintain a stable state by using a PID control mode.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
and adjusting the duty ratio of the switching pulse to a first preset parameter according to the variable pulse width modulation mode and the voltage switching rising instruction.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
and adjusting the duty ratio of the switching pulse to a second preset parameter according to the variable pulse width modulation mode and the voltage switching descending instruction.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
and adjusting the switching pulse frequency to a third preset parameter according to the variable frequency modulation mode and the voltage switching ascending instruction.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
and stopping driving the switching pulse according to the variable frequency modulation mode and the voltage switching descending instruction.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
acquiring the output voltage of a high-voltage generator; when the voltage switching instruction is a voltage switching rising instruction and the output voltage is greater than or equal to a high-voltage mode voltage with a first preset proportion, the high-voltage generator completes voltage switching; and when the voltage switching instruction is a voltage switching descending instruction and the output voltage is less than or equal to the low-voltage mode voltage of a second preset proportion, the high-voltage generator completes voltage switching.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:
acquiring a voltage modulation mode and a voltage switching instruction of a high-voltage generator; regulating a modulation parameter corresponding to the voltage modulation mode to a preset parameter value by adopting segmented feedforward according to the voltage modulation mode and a voltage switching instruction; and if the high-voltage generator finishes voltage switching, controlling the voltage to maintain a stable state by using a PID control mode.
In one embodiment, the computer program when executed by the processor further performs the steps of:
and adjusting the duty ratio of the switching pulse to a first preset parameter according to the variable pulse width modulation mode and the voltage switching rising instruction.
In one embodiment, the computer program when executed by the processor further performs the steps of:
and adjusting the duty ratio of the switching pulse to a second preset parameter according to the variable pulse width modulation mode and the voltage switching descending instruction.
In one embodiment, the computer program when executed by the processor further performs the steps of:
and adjusting the switching pulse frequency to a third preset parameter according to the variable frequency modulation mode and the voltage switching ascending instruction.
In one embodiment, the computer program when executed by the processor further performs the steps of:
and stopping driving the switching pulse according to the variable frequency modulation mode and the voltage switching descending instruction.
In one embodiment, the computer program when executed by the processor further performs the steps of:
acquiring the output voltage of a high-voltage generator; when the voltage switching instruction is a voltage switching rising instruction and the output voltage is greater than or equal to a high-voltage mode voltage with a first preset proportion, the high-voltage generator completes voltage switching; and when the voltage switching instruction is a voltage switching descending instruction and the output voltage is less than or equal to the low-voltage mode voltage of a second preset proportion, the high-voltage generator completes voltage switching.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as 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 application, 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 concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method of voltage switching a high voltage generator, the method comprising:
acquiring a voltage modulation mode and a voltage switching instruction of a high-voltage generator;
regulating a modulation parameter corresponding to the voltage modulation mode to a preset parameter value by adopting segmented feedforward according to the voltage modulation mode and a voltage switching instruction; the voltage switching instructions include: a voltage switching up command for switching the high voltage generator from a low level voltage to a high level voltage and a voltage switching down command for switching the high voltage generator from a high level voltage to a low level voltage;
and if the high-voltage generator finishes voltage switching, controlling the voltage to maintain a stable state by using a PID control mode.
2. The method of claim 1,
the voltage modulation modes include: a variable pulse width modulation mode and a variable frequency modulation mode.
3. The method of claim 2, wherein the adjusting the modulation parameter corresponding to the voltage modulation mode to a preset parameter value using a segmented feedforward according to the voltage modulation mode and a voltage switching command comprises: if the voltage modulation mode is a variable pulse width modulation mode, and the voltage switching instruction is a voltage switching rising instruction;
and adjusting the duty ratio of the switching pulse to a first preset parameter according to the variable pulse width modulation mode and the voltage switching rising instruction.
4. The method of claim 2, wherein the adjusting the modulation parameter corresponding to the voltage modulation mode to a preset parameter value using a segmented feedforward according to the voltage modulation mode and a voltage switching command comprises: if the voltage modulation mode is a variable pulse width modulation mode, and the voltage switching instruction is a voltage switching descending instruction;
and adjusting the duty ratio of the switching pulse to a second preset parameter according to the variable pulse width modulation mode and the voltage switching descending instruction.
5. The method of claim 2, wherein the adjusting the modulation parameter corresponding to the voltage modulation mode to a preset parameter value using a segmented feedforward according to the voltage modulation mode and a voltage switching command comprises: if the voltage modulation mode is a variable frequency modulation mode, and the voltage switching instruction is a voltage switching ascending instruction;
and adjusting the switching pulse frequency to a third preset parameter according to the variable frequency modulation mode and the voltage switching ascending instruction.
6. The method of claim 2, wherein the adjusting the modulation parameter corresponding to the voltage modulation mode to a preset parameter value using a segmented feedforward according to the voltage modulation mode and a voltage switching command comprises: if the voltage modulation mode is a variable frequency modulation mode, and the voltage switching instruction is a voltage switching descending instruction;
and stopping driving the switching pulse according to the variable frequency modulation mode and the voltage switching descending instruction.
7. The method of claim 2, wherein the step of, if the high voltage generator completes the voltage switching, comprises:
acquiring the output voltage of a high-voltage generator;
when the voltage switching instruction is a voltage switching rising instruction and the output voltage is greater than or equal to a high-voltage mode voltage with a first preset proportion, the high-voltage generator completes voltage switching;
and when the voltage switching instruction is a voltage switching descending instruction and the output voltage is less than or equal to the low-voltage mode voltage of a second preset proportion, the high-voltage generator completes voltage switching.
8. A high voltage generator voltage switching device, the device comprising:
the acquisition module is used for acquiring a voltage modulation mode and a voltage switching instruction of the high-voltage generator;
the adjusting module is used for adjusting the modulation parameters corresponding to the voltage modulation mode to preset parameter values by adopting segmented feedforward according to the voltage modulation mode and the voltage switching instruction; the voltage switching instructions include: a voltage switching up command for switching the high voltage generator from a low level voltage to a high level voltage and a voltage switching down command for switching the high voltage generator from a high level voltage to a low level voltage;
and the steady state maintaining module is used for controlling the voltage to maintain a steady state by utilizing a PID control mode if the high-voltage generator finishes voltage switching.
9. A computer device comprising a memory and a processor, the memory storing a computer program, wherein the processor implements the steps of the method of any one of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 7.
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