CN112953282A - High-voltage generator, radiographic imaging equipment and control method of high-voltage generator - Google Patents
High-voltage generator, radiographic imaging equipment and control method of high-voltage generator Download PDFInfo
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- CN112953282A CN112953282A CN202110158883.9A CN202110158883A CN112953282A CN 112953282 A CN112953282 A CN 112953282A CN 202110158883 A CN202110158883 A CN 202110158883A CN 112953282 A CN112953282 A CN 112953282A
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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
- H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
- H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
- H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of DC power input into AC 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
- H02M7/537—Conversion of DC power input into AC 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, e.g. single switched pulse inverters
- H02M7/5387—Conversion of DC power input into AC 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, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of DC power input into AC 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, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a high voltage generator, a ray imaging device and a control method of the high voltage generator, wherein the high voltage generator comprises: an oil tank; the converter system is provided with an inversion module, a resonance module and a controller, wherein the inversion module is connected with the oil tank through the resonance module; the controller is used for identifying the current working mode of the high-voltage generator based on a preset power threshold, a current signal fed back by the resonance module and a voltage signal fed back by the oil tank, when the current working mode is a light-load mode, the working frequency of the inverter module is adjusted based on an intermittent pulse modulation method, and when the current working mode is a heavy-load mode, the working frequency of the inverter module is adjusted based on a continuous pulse modulation method, so that the high pulse frequency is realized, the heating of devices is reduced, the cost is reduced, few devices are used, a high-voltage large-current contactor and a high-power resonance inductor are omitted, and the reliability is greatly improved.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a high-voltage generator, a ray imaging device and a control method of the high-voltage generator.
Background
The high voltage generator is widely used in radiography/fluoroscopy systems including DR, gastrointestinal machine, dynamic DR, etc. the load of the high voltage generator for radiography is an X-ray tube, and the output voltage and current range is wide, the voltage is from 40kV to 150kV, and the current is from 10mA to 1000 mA. The medical X-ray high-voltage generator mostly adopts an LCC resonant converter, the working frequency of the LCC resonant converter changes along with the load, the frequency is very high under light load, and the frequency is very low under heavy load. In order to meet the working requirements of short-time high power and long-time low power at the same time, the working frequency of the high-voltage generator needs to be changed in a wide range, and particularly when the high-voltage generator works under light load for a long time, power devices, a transformer and the like in the high-voltage generator work in a high-frequency state (for example, 100 kHz-500 kHz) for a long time, the heat productivity is extremely high, and a high-capacity heat dissipation system is needed for heat dissipation. The traditional method is that two sets of power conversion systems are adopted, and when the power conversion system works in different modes, a contactor is needed to switch a resonant inductor between the two sets of power conversion systems; when the converter works under a long-time light load, the converter is switched to a large resonant inductor, the converter works at a lower frequency (about 20 kHz), and other conditions are switched to a small resonant inductor and work at a higher frequency (above 100 kHz). The scheme needs a high-power inductor, a high-power contactor and the like, and increases the volume and the cost.
Disclosure of Invention
Therefore, the present invention is directed to overcome the defect of complicated switching method of the high voltage generator between the heavy load operation module and the light load operation module in the prior art, and to provide a high voltage generator, a radiographic imaging apparatus, and a control method of the high voltage generator.
In order to achieve the purpose, the invention provides the following technical scheme:
in a first aspect, an embodiment of the present invention provides a high voltage generator, including: an oil tank; the converter system is provided with an inversion module, a resonance module and a controller, wherein the inversion module is connected with the oil tank through the resonance module; the controller is used for identifying the current working mode of the high-voltage generator based on a preset power threshold, a current signal fed back by the resonance module and a voltage signal fed back by the oil tank, adjusting the working frequency of the inverter module based on an intermittent pulse modulation method when the current working mode is a light-load mode, and adjusting the working frequency of the inverter module based on a continuous pulse modulation method when the current working mode is a heavy-load mode.
In one embodiment, the controller includes: the input end of the data processing module is respectively connected with the resonance module and the oil tank, and the data processing module is used for identifying the current working mode based on a preset power threshold value, a current signal fed back by the resonance module and a voltage signal fed back by the oil tank and outputting a frequency fixed value corresponding to the current working mode; and the input end of the frequency pulse modulation module is connected with the output end of the data processing module, and the output end of the frequency pulse modulation module is connected with the inversion module and used for adjusting the working frequency of the inversion module by outputting a corresponding pulse signal based on a frequency fixed value.
In one embodiment, the high voltage generator further comprises: and the input end of the acquisition module is respectively connected with the resonance module and the oil tank, and the output end of the acquisition module is connected with the controller and used for acquiring a current signal of the resonance module and a voltage signal of the oil tank.
In one embodiment, a resonance module includes: the inductor is connected with the output end of the inversion module; and the capacitor is connected with the inductor in series.
In one embodiment, the high voltage generator further comprises: an EMI filter connected to a power supply; and the pre-charging and rectifying module is respectively connected with the EMI filter and the converter system.
In a second aspect, an embodiment of the present invention provides a radiographic imaging apparatus, including the high voltage generator according to the first aspect.
In a third aspect, an embodiment of the present invention provides a method for controlling a high voltage generator, where the high voltage generator according to the first aspect includes: acquiring a current signal of a resonance module and a voltage signal of an oil tank; identifying a current working mode based on a preset power threshold, a current signal fed back by the resonance module and a voltage signal fed back by the oil tank; when the current working mode is the light load mode, the working frequency of the inversion module is adjusted based on an intermittent pulse modulation method, and when the current working mode is the heavy load mode, the working frequency of the inversion module is adjusted based on a continuous pulse modulation method.
In an embodiment, when the current operating mode is the light load mode, the process of adjusting the operating frequency of the inverter module based on the intermittent pulse modulation method includes: calculating the current power according to the current signal fed back by the resonance module and the voltage signal fed back by the oil tank; judging whether the current power is lower than a preset power threshold, judging that the current working mode is a light-load mode when the current power is lower than the preset power threshold, and acquiring a frequency fixed value corresponding to the light-load mode; and generating an intermittent pulse signal based on the frequency fixed value corresponding to the light load mode, and adjusting the working frequency of the inversion module.
In one embodiment, the intermittent pulse signal is formed by alternately outputting a first preset number of low-level pulses and a second preset number of high-level pulses, and the first preset number is greater than the second preset number.
In an embodiment, when the current operating mode is the heavy load mode, the process of adjusting the operating frequency of the inverter module based on the continuous pulse modulation method includes: calculating the current power according to the current signal fed back by the resonance module and the voltage signal fed back by the oil tank; judging whether the current power is higher than a preset power threshold, judging that the current working mode is a heavy load mode when the current power is higher than the preset power threshold, and acquiring a frequency fixed value corresponding to the heavy load mode; and generating a continuous pulse signal based on the frequency fixed value corresponding to the heavy-load mode, and adjusting the working frequency of the inversion module.
The technical scheme of the invention has the following advantages:
1. according to the high-voltage generator provided by the invention, the controller adjusts the working frequency of the inverter module based on the voltage signal fed back by the oil tank and the current signal fed back by the resonance module, namely, the working frequency of the inverter module is adjusted by adopting a continuous pulse modulation method during heavy load, and the working frequency of the inverter module is adjusted by adopting an intermittent pulse modulation method during light load, so that high pulse frequency is realized, the heating of devices is reduced, the cost is reduced, fewer devices are used, a high-voltage large-current contactor and a high-power resonance inductor are omitted, and the reliability is greatly improved.
2. The inductor, the capacitor and the oil tank in the high-voltage generator form an LCC series-parallel resonant circuit, and the resonant circuit combines the characteristics of series converters and parallel converters, so that the high-voltage generator has better adjustability and load adaptability.
3. The controller in the radiographic imaging device provided by the invention adjusts the working frequency of the inversion module based on the voltage signal fed back by the oil tank and the current signal fed back by the resonance module, namely, when the load is heavy, the working frequency of the inversion module is adjusted by adopting a continuous pulse modulation method, when the load is light, the working frequency of the inversion module is adjusted by adopting an intermittent pulse modulation method, and the switching of the working frequency of the inversion module is realized on the basis of not changing the hardware parameters of the circuit.
4. The control method of the high-voltage generator provided by the invention carries out closed-loop feedback control according to the voltage signal fed back by the oil tank and the current signal fed back by the resonance module, adjusts the working frequency of the inversion module according to the working mode of the high-voltage generator, adjusts the working frequency of the inversion module by adopting a continuous pulse modulation method during heavy load, and adjusts the working frequency of the inversion module by adopting an intermittent pulse modulation method during light load, thereby realizing high pulse frequency and reducing the heat generation of devices.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a composition diagram of a specific example of a high voltage generator provided by an embodiment of the present invention;
FIG. 2 is an intermittent pulse signal provided by an embodiment of the present invention;
FIG. 3 is a detailed control block diagram of a closed-loop feedback control provided by an embodiment of the present invention;
FIG. 4 is a continuous pulse signal provided by an embodiment of the present invention;
fig. 5 is a composition diagram of another specific example of the high voltage generator provided by the embodiment of the invention;
fig. 6 is a composition diagram of another specific example of the high voltage generator provided by the embodiment of the invention;
fig. 7 is a composition diagram of a specific example of a resonance module provided by the embodiment of the present invention;
fig. 8 is a composition diagram of another specific example of the high voltage generator provided by the embodiment of the invention;
fig. 9 is a composition diagram of another specific example of the high voltage generator provided by the embodiment of the invention;
fig. 10 is a flowchart of a specific example of a control method of the high voltage generator according to the embodiment of the present invention;
FIG. 11 is a flowchart of a specific example of an intermittent pulse modulation method provided by an embodiment of the present invention;
fig. 12 is a flowchart of a specific example of a continuous pulse modulation method according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Examples
An embodiment of the present invention provides a high voltage generator, which is applied to an occasion where a working frequency of the high voltage generator needs to be changed in a wide range, as shown in fig. 1, and includes: a tank 1 and an inverter system 2.
The oil tank 1 of the embodiment of the invention can be a high-voltage oil tank, in the radiographic apparatus, the high-voltage oil tank is mostly connected with the bulb, the high-voltage oil tank can comprise a high-frequency transformer, a high-voltage rectifier, a filter and the like so as to convert an input low-voltage electric signal into a high-voltage electric signal, and the high-voltage electric signal is output to two ends of the bulb, so that the bulb generates rays.
As shown in fig. 1, a converter system 2 according to an embodiment of the present invention includes an inverter module 21, a resonance module 22, and a controller 23, where the inverter module 21 is connected to an oil tank 1 through the resonance module 22; the controller 23 is configured to identify a current working mode of the high-voltage generator based on a preset power threshold, a current signal fed back by the resonance module 22, and a voltage signal fed back by the oil tank 1, adjust a working frequency of the inverter module 21 based on an intermittent pulse modulation method when the current working mode is a light load mode, and adjust the working frequency of the inverter module 21 based on a continuous pulse modulation method when the current working mode is a heavy load mode.
Specifically, the inverter module 21 according to the embodiment of the present invention converts the input dc power into ac power, and outputs the ac power to the oil tank 1 through the resonance module 22, wherein the inverter module 21 may be a three-phase full-bridge inverter formed by MOSFETs, and specifically, the power device in the inverter board is a MOSFET, and since the MOSFET is a voltage-controlled unipolar transistor, the MOSFET controls the drain current by the gate voltage, and is only conductive by most carriers, and has no minority carrier storage effect, and has a good high frequency characteristic, and the operating frequency can reach 100KHz or more. Therefore, the MOSFET is selected as a power device in the inverter board, and the full-range work of the photography perspective high-voltage generator in a high-frequency state can be ensured.
In the embodiment of the present invention, in order to avoid that the inverter module 21 still operates in a high frequency state when the high voltage generator is in a low power (light load) state for a long time, the controller 23 recognizes that the high voltage generator is in a light load state based on the current signal fed back by the resonance module 22 and the voltage signal fed back by the oil tank 1, and performs closed loop feedback control on the inverter module 21 based on the voltage signal set value and the current signal set value corresponding to the light load state sent by the upper computer, the voltage signal fed back by the oil tank 1, and the current signal fed back by the resonance module 22, and adopts an intermittent pulse frequency modulation method to output an intermittent pulse as shown in fig. 2 to drive the inverter module 21 to operate, as shown in fig. 3, wherein the closed loop feedback can use PI, PID, lead-lag correction, etc. in fig. 3, the controller 23 performs PID adjustment on the current value of the voltage signal and the input current, outputting the signal to the PFM controller so that the PFM outputs the operating frequency of the inverter module 21; when the controller 23 recognizes that the high voltage generator works under the condition of heavy load, the controller 23 performs closed-loop feedback control on the inverter module 21 according to the voltage signal set value and the current signal set value corresponding to the heavy load condition set by the upper computer and the electric signal fed back by the oil tank 1 to output continuous pulses as shown in fig. 4 to drive the inverter module 21 to work.
As shown in fig. 2, the intermittent pulse signal is formed by alternately outputting a first preset number of low-level pulses and a second preset number of high-level pulses, and the first preset number is greater than the second preset number, that is, after continuously outputting M low-level pulses, N high-level pulses are continuously output, where M > N, M >2, and N > 1.
According to the high-voltage generator provided by the embodiment of the invention, the controller adjusts the working frequency of the inverter module based on the voltage signal fed back by the oil tank and the current signal fed back by the resonance module, when the working mode is heavy load, the working frequency of the inverter module is adjusted by adopting a continuous pulse modulation method, and when the working mode is light load, the working frequency of the inverter module is adjusted by adopting an intermittent pulse modulation method, so that the high pulse frequency is realized, the heating of devices is reduced, the cost is reduced, few devices are used, a high-voltage large-current contactor and a high-power resonance inductor are omitted, and the reliability is greatly improved.
In one embodiment, as shown in fig. 5, the controller 23 includes: a data processing module 231 and a frequency pulse modulation module 232.
As shown in fig. 5, an input end of the data processing module 231 according to the embodiment of the present invention is connected to the resonance module 22 and the oil tank 1, respectively, and is configured to identify a current working mode based on a preset power threshold, a current signal fed back by the resonance module 22, and a voltage signal fed back by the oil tank 1, and output a frequency fixed value corresponding to the current working mode.
As shown in fig. 5, an input end of the frequency pulse modulation module 232 according to the embodiment of the present invention is connected to an output end of the data processing module 231, and an output end thereof is connected to the inversion module 21, and is configured to adjust the operating frequency of the inversion module 21 by outputting a corresponding pulse signal based on the frequency fixed value.
Before the high-voltage generator works, the upper computer sends a preset power threshold value to the data processing module 231, and sends a voltage signal set value and a current signal set value of an intermittent pulse signal corresponding to light load and a voltage signal set value and a current signal set value of a continuous pulse signal corresponding to heavy load to the data processing module 231, the data processing module 231 judges the working condition of the high-voltage generator based on the current signal fed back by the resonance module 22 and the voltage signal fed back by the oil tank 1, and then sends a corresponding frequency fixed value to the frequency pulse modulation module 232, and the frequency pulse modulation module 232 sends the intermittent pulse signal or the continuous pulse signal according to the frequency fixed value.
Specifically, the frequency pulse modulation module 232 according to the embodiment of the present invention may be an FPGA chip, and the data processing device may be a DSP chip.
In a specific embodiment, as shown in fig. 6, the high voltage generator further comprises: and the input end of the acquisition module 3 is respectively connected with the resonance module 22 and the oil tank 1, and the output end of the acquisition module is connected with the controller 23 and is used for acquiring a current signal of the resonance module 22 and a voltage signal of the oil tank 1.
The acquisition module 3 of the embodiment of the present invention may include a voltage acquisition module and a current acquisition module, wherein the voltage acquisition module may include a voltage transformer, a filter, etc., and the current acquisition module may include a current transformer, a filter, etc.
In one embodiment, as shown in fig. 7, the resonance module 22 includes: the inductor L is connected with the output end of the inverter module 21; and the capacitor C is connected with the inductor L in series.
The resonant circuit of the embodiment of the invention utilizes the circuit parasitic parameters to participate in resonance, reduces the circuit loss, can realize zero voltage switching-on or zero current switching-off, reduces the loss of a switching tube, and improves the switching frequency. The resonant module 22 in fig. 7 is an LCL resonant circuit, wherein the resonant circuit may be other resonant circuits, such as: LLC resonant circuits, LC resonant circuits, etc.
As shown in fig. 8, the converter system 2 according to the embodiment of the present invention further includes a driving module 24, connected between the frequency pulse modulation module 232 and the inverter module 21, for converting the continuous pulse signal or the intermittent pulse signal into a driving signal capable of driving the inverter module 21 to operate, where the driving module 24 may be a voltage conversion circuit.
In a specific embodiment, as shown in fig. 9, the high voltage generator further comprises: the device comprises an EMI filter 4 and a pre-charging and rectifying module 5, wherein the EMI filter 4 is connected with a power supply; and a pre-charging and rectifying module 5 connected to the EMI filter and the inverter system 2, respectively.
The power supply of the embodiment of the invention can comprise a filament driving power supply, a rotating anode driving power supply, an auxiliary power supply and the like, and the pre-charging and rectifying module can be a module formed by a pre-charging circuit and a rectifying circuit which are common in the prior art.
According to the high-voltage generator provided by the embodiment of the invention, the inductor, the capacitor and the oil tank form the LCC series-parallel resonant circuit, and the resonant circuit combines the characteristics of series converters and parallel converters, so that the high-voltage generator has better adjustability and load adaptability.
Example 2
The embodiment of the invention provides a ray imaging device which comprises the high-voltage generator in the embodiment 1, wherein the high-voltage generator is connected with a bulb tube, after alternating current is converted into direct current by an inverter module 21 in the high-voltage generator, low-voltage direct current is converted into high-voltage direct current by an oil tank 1, and the high-voltage direct current is output to two ends of the bulb tube so that the bulb tube generates rays.
According to the radiographic imaging device provided by the embodiment of the invention, the controller adjusts the working frequency of the inverter module based on the voltage signal fed back by the oil tank and the current signal fed back by the resonance module, namely when the working mode is heavy load, the working frequency of the inverter module is adjusted by adopting a continuous pulse modulation method, when the working mode is light load, the working frequency of the inverter module is adjusted by adopting an intermittent pulse modulation method, and the switching of the working frequency of the inverter module is realized on the basis of not changing the hardware parameters of the circuit.
Example 3
An embodiment of the present invention provides a control method for a high voltage generator, based on the high voltage generator of embodiment 1, as shown in fig. 10, the control method includes:
step S11: and acquiring a current signal of the resonance module and a voltage signal of the oil tank.
Step S12: and identifying the current working mode based on a preset power threshold, a current signal fed back by the resonance module and a voltage signal fed back by the oil tank.
Step S13: when the current working mode is the light load mode, the working frequency of the inversion module is adjusted based on an intermittent pulse modulation method, and when the current working mode is the heavy load mode, the working frequency of the inversion module is adjusted based on a continuous pulse modulation method.
The controller calculates the current power of the current high-voltage generator based on a current signal fed back by the resonance module and a voltage signal fed back by the oil tank, judges whether the current power is lower than a preset power threshold, judges that the high-voltage generator works in a light load mode when the current power is lower than the preset power threshold, judges that the high-voltage generator works in a heavy load module when the current power is higher than the preset power threshold, adjusts the working frequency of the inverter module based on different working modules of the high-voltage generator, namely, in the light load mode, the working frequency of the inverter module is adjusted by an intermittent pulse modulation method, and in the heavy load mode, the working frequency of the inverter module is adjusted based on a continuous pulse modulation method.
In addition, the control method for the high voltage generator according to the embodiment of the present invention includes control methods such as PI and PID in addition to the frequency pulse modulation method, and specifically, the control block diagram is shown in fig. 3.
In a specific embodiment, as shown in fig. 11, when the current operating mode is the light load mode, the process of adjusting the operating frequency of the inverter module based on the intermittent pulse modulation method includes:
step S21: and calculating the current power according to the current signal fed back by the resonance module and the voltage signal fed back by the oil tank.
Step S22: and judging whether the current power is lower than a preset power threshold, judging that the current working mode is a light-load mode when the current power is lower than the preset power threshold, and acquiring a frequency fixed value corresponding to the light-load mode.
Step S22: and generating an intermittent pulse signal based on the frequency fixed value corresponding to the light load mode, and adjusting the working frequency of the inversion module.
In the embodiment of the present invention, when the controller determines that the high voltage generator operates in the light load mode, according to a voltage signal set value and a current signal set value set by the upper computer, an intermittent pulse signal as shown in fig. 2 is output to drive the inverter module to operate, where the intermittent pulse signal is formed by alternately outputting a first preset number of low level pulses and a second preset number of high level pulses, the first preset number is greater than the second preset number, that is, after continuously outputting M low level pulses, N high level pulses are continuously output, where M > N, M >2, and N > 1.
In an embodiment, as shown in fig. 12, when the current operating mode is the heavy load mode, the process of adjusting the operating frequency of the inverter module based on the continuous pulse modulation method includes:
step S31: calculating the current power according to the current signal fed back by the resonance module and the voltage signal fed back by the oil tank;
step S32: judging whether the current power is higher than a preset power threshold, judging that the current working mode is a heavy load mode when the current power is higher than the preset power threshold, and acquiring a frequency fixed value corresponding to the heavy load mode;
step S33: and generating a continuous pulse signal based on the frequency fixed value corresponding to the heavy-load mode, and adjusting the working frequency of the inversion module.
In the embodiment of the invention, when the controller judges that the high-voltage generator works in the light-load mode, the continuous pulse signal shown in figure 4 is output according to the voltage signal set value and the current signal set value set by the upper computer so as to drive the inverter module to work.
According to the control method of the high-voltage generator provided by the embodiment of the invention, closed-loop feedback control is carried out according to a voltage signal fed back by the oil tank and a current signal fed back by the resonance module, the working frequency of the inverter module is adjusted according to the working mode of the high-voltage generator, when the working mode is heavy load, the working frequency of the inverter module is adjusted by adopting a continuous pulse modulation method, and when the working mode is light load, the working frequency of the inverter module is adjusted by adopting an intermittent pulse modulation method, so that high pulse frequency is realized, and the heat of a device is reduced.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (10)
1. A high voltage generator, comprising:
an oil tank;
the converter system is provided with an inversion module, a resonance module and a controller, and the inversion module is connected with the oil tank through the resonance module; the controller is used for identifying a current working mode of the high-voltage generator based on a preset power threshold, a current signal fed back by the resonance module and a voltage signal fed back by the oil tank, adjusting the working frequency of the inversion module based on an intermittent pulse modulation method when the current working mode is a light-load mode, and adjusting the working frequency of the inversion module based on a continuous pulse modulation method when the current working mode is a heavy-load mode.
2. The high voltage generator of claim 1, wherein the controller comprises:
the input end of the data processing module is respectively connected with the resonance module and the oil tank, and the data processing module is used for identifying the current working mode and outputting a frequency fixed value corresponding to the current working mode based on a preset power threshold value, a current signal fed back by the resonance module and a voltage signal fed back by the oil tank;
and the input end of the frequency pulse modulation module is connected with the output end of the data processing module, and the output end of the frequency pulse modulation module is connected with the inversion module and used for adjusting the working frequency of the inversion module by outputting a corresponding pulse signal based on the frequency fixed value.
3. The high voltage generator of claim 1, further comprising:
and the input end of the acquisition module is respectively connected with the resonance module and the oil tank, and the output end of the acquisition module is connected with the controller and used for acquiring the current signal of the resonance module and the voltage signal of the oil tank.
4. The high voltage generator of claim 1, wherein the resonance module comprises:
the inductor is connected with the output end of the inversion module;
and the capacitor is connected with the inductor in series.
5. The high voltage generator according to any one of claims 1-4, further comprising:
an EMI filter connected to a power supply;
and the pre-charging and rectifying module is respectively connected with the EMI filter and the converter system.
6. Radiographic imaging apparatus, characterized in that it comprises a high voltage generator according to any one of claims 1 to 5.
7. A control method of a high voltage generator according to any one of claims 1 to 5, comprising:
acquiring a current signal of a resonance module and a voltage signal of the oil tank;
identifying a current working mode based on a preset power threshold, a current signal fed back by the resonance module and a voltage signal fed back by the oil tank;
when the current working mode is the light load mode, the working frequency of the inversion module is adjusted based on an intermittent pulse modulation method, and when the current working mode is the heavy load mode, the working frequency of the inversion module is adjusted based on a continuous pulse modulation method.
8. The method for controlling a high voltage generator according to claim 7, wherein the adjusting of the operating frequency of the inverter module based on the intermittent pulse modulation method when the current operating mode is the light load mode comprises:
calculating the current power according to the current signal fed back by the resonance module and the voltage signal fed back by the oil tank;
judging whether the current power is lower than the preset power threshold, judging that the current working mode is a light-load mode when the current power is lower than the preset power threshold, and acquiring a frequency fixed value corresponding to the light-load mode;
and generating an intermittent pulse signal based on the frequency fixed value corresponding to the light load mode, and adjusting the working frequency of the inversion module.
9. The method as claimed in claim 8, wherein the intermittent pulse signal is composed of a first preset number of low level pulses and a second preset number of high level pulses, and the first preset number is greater than the second preset number.
10. The method for controlling a high voltage generator according to claim 7, wherein the adjusting the operating frequency of the inverter module based on a continuous pulse modulation method when the current operating mode is the heavy load mode comprises:
calculating the current power according to the current signal fed back by the resonance module and the voltage signal fed back by the oil tank;
judging whether the current power is higher than the preset power threshold, judging that the current working mode is a heavy load mode when the current power is higher than the preset power threshold, and acquiring a frequency fixed value corresponding to the heavy load mode;
and generating a continuous pulse signal based on the frequency fixed value corresponding to the heavy-load mode, and adjusting the working frequency of the inversion module.
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| CN202110158883.9A CN112953282A (en) | 2021-02-04 | 2021-02-04 | High-voltage generator, radiographic imaging equipment and control method of high-voltage generator |
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