CN118265212A - Voltage switching method of high-voltage generator and high-voltage generator - Google Patents
Voltage switching method of high-voltage generator and high-voltage generator Download PDFInfo
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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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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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
- H02M1/0083—Converters characterised by their input or output configuration
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- H—ELECTRICITY
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- H05G—X-RAY TECHNIQUE
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Abstract
The invention provides a voltage switching method of a high-voltage generator, the high-voltage generator, an X-ray imaging system and a dual-energy switching method of the X-ray imaging system. The method comprises the following steps: receiving a voltage switching command, wherein the voltage switching command comprises a target output voltage; the voltage switching instruction is used for indicating to switch the initial output voltage to the target output voltage; determining a voltage control parameter according to the received voltage switching instruction, wherein the voltage control parameter comprises a target voltage set value; according to the target voltage set value, the current output voltage is regulated; the absolute value of the voltage difference between the target voltage set value and the initial output voltage is larger than that of the voltage difference between the target output voltage and the initial output voltage. The absolute value of the voltage difference between the target voltage set value and the initial output voltage is larger than that of the voltage difference between the target output voltage and the initial output voltage, so that the switching of the initial output voltage to the target output voltage can be quickened.
Description
Technical Field
The invention relates to the technical field of CT (Computed Tomography, computerized tomography) machines, in particular to a voltage switching method of a high-voltage generator, the high-voltage generator, an X-ray imaging system and a dual-energy switching method of the X-ray imaging system.
Background
One implementation of dual-energy CT is based on the instantaneous voltage technique, i.e. the voltage output by the CT high voltage generator to the bulb is switched rapidly between a low voltage kv_l and a high voltage kv_h. The X-ray energy emitted by the bulb tube under the two different voltages is mainly concentrated near the two different energy levels, and the detector can obtain dual-energy data according to the X-ray energy.
Referring to fig. 1, after receiving a voltage switching command of the CT system, an analog or digital controller (i.e., a main power controller) inside the CT high-voltage generator performs closed-loop control based on a changed voltage set value (the voltage set value may also be referred to as a command value) and an output voltage real-time feedback value, so that an actual output voltage is converted into a voltage required by the CT system.
The controller of the traditional power electronic converter realizes the conversion of output voltage through closed-loop control after inputting the converted voltage set value, and the voltage set value change modes input to the controller often have the following two types: a single step or a piecewise step, gradually changing with a fixed or varying slope. The controller gradually approaches the output voltage to the set parameters through closed-loop control, so that the actual output voltage and the set parameters are finally consistent.
The output voltage switching process of the CT high-voltage generator is similar to the process, and the voltage set value always changes in the [ kV_L, kV_H ] interval in the switching process no matter what the switching track is, so that the switching speed of the actual output voltage is slower.
Disclosure of Invention
The invention provides a voltage switching method of a high-voltage generator, the high-voltage generator, an X-ray imaging system and a dual-energy switching method of the X-ray imaging system, which are used for solving the technical problem that the switching speed of the actual output voltage of the high-voltage generator is relatively slow.
In order to solve the technical problems, the invention provides a voltage switching method of a high-voltage generator, which is characterized by comprising the following steps:
Receiving a voltage switching instruction, wherein the voltage switching instruction comprises a target output voltage; the voltage switching instruction is used for indicating to switch the initial output voltage to the target output voltage;
determining a voltage control parameter according to the received voltage switching instruction, wherein the voltage control parameter comprises a target voltage set value;
According to the target voltage set value, adjusting the current output voltage; wherein the absolute value of the voltage difference between the target voltage set value and the initial output voltage is greater than the absolute value of the voltage difference between the target output voltage and the initial output voltage.
Optionally, the voltage control parameter includes a voltage set point, and the method further includes the steps of: and adjusting the current output voltage to the target output voltage according to the voltage set value, wherein the voltage set value is determined to be equal to the target voltage set value in at least a period of time when the current output voltage is not switched to the target output voltage.
Optionally, the step of determining a voltage control parameter according to the received voltage switching command specifically includes the following steps:
if the initial output voltage is less than the target output voltage, determining that the target voltage set point is greater than the target output voltage;
and if the initial output voltage is greater than the target output voltage, determining that the target voltage set value is less than the target output voltage.
Optionally, after the step of determining that the voltage set point is equal to the target voltage set point, the method further comprises the steps of: determining that the voltage set point is equal to the target output voltage.
Optionally, during at least a period of time between the step of determining that the voltage set point is equal to the target voltage set point and the step of determining that the voltage set point is equal to the target output voltage, the method further comprises the steps of:
if the initial output voltage is less than the target output voltage, determining that the voltage set point is less than the target output voltage;
If the initial output voltage is greater than the target output voltage, determining that the voltage set point is greater than the target output voltage.
Optionally, the voltage switching instruction further includes a voltage switching start time and a voltage switching completion time; at the voltage switching start time, the voltage set value is set to the target voltage set value.
Optionally, the ratio of the absolute value of the voltage difference between the target voltage set value and the initial output voltage to the absolute value of the voltage difference between the target output voltage and the initial output voltage ranges from 105% to 120%.
Optionally, the duration of the voltage set point equal to the target voltage set point is equal to a first duration, the duration of the voltage set point equal to the target output voltage is equal to a second duration, and the first duration is less than the second duration.
Optionally, the step of determining a voltage control parameter according to the received voltage switching command specifically includes the following steps:
and determining a voltage set point track corresponding to the current voltage switching instruction from preset voltage set point tracks according to the indication of the voltage switching instruction.
Optionally, the step of determining a voltage control parameter according to the received voltage switching command specifically includes the following steps: and acquiring the current output voltage in real time, and dynamically adjusting a voltage set value according to the difference value between the current output voltage and the target output voltage to change the current output voltage to the target output voltage.
The invention also provides another voltage switching method of the high-voltage generator, which comprises the following steps:
Receiving a voltage switching instruction, wherein the voltage switching instruction comprises a target output voltage, and the voltage switching instruction is used for indicating to switch an initial output voltage to the target output voltage;
acquiring a sampling value of the current output voltage;
Generating an error value according to the target output voltage and the sampling value;
Superposing the superposition value corresponding to the error value with the error value according to the error value and a preset superposition rule to obtain a virtual error;
determining a voltage control parameter according to the virtual error, wherein the voltage control parameter comprises a target voltage set value;
According to the target voltage set value, adjusting the current output voltage; wherein the absolute value of the voltage difference between the target voltage set value and the initial output voltage is greater than the absolute value of the voltage difference between the target output voltage and the initial output voltage.
The invention also provides a high-voltage generator, which comprises a controller, wherein the controller is used for executing the voltage switching method of the high-voltage generator.
The invention also provides an X-ray imaging system comprising the high-voltage generator.
The invention also provides a dual-energy switching method of the X-ray imaging system, which responds to the received X-ray energy switching instruction, wherein the X-ray energy switching instruction comprises a voltage switching instruction; the voltage switching method of the high-voltage generator is adopted to switch and output a target output voltage, wherein the target output voltage is used for being applied to a bulb tube, so that the bulb tube generates a target X-ray dose corresponding to the X-ray energy switching instruction.
According to the voltage switching method of the high-voltage generator, the X-ray imaging system and the dual-energy switching method of the X-ray imaging system, in the process of switching the initial output voltage to the target output voltage, at least one target voltage set value is set, the absolute value of the voltage difference between the target voltage set value and the initial output voltage is larger than the absolute value of the voltage difference between the target output voltage and the initial output voltage, namely, the target voltage set value exceeds the range from the initial output voltage to the target output voltage and the change rate of the current output voltage is accelerated, so that the switching of the initial output voltage to the target output voltage can be accelerated.
Drawings
Fig. 1 is a schematic structural diagram of an X-ray imaging system according to an embodiment of the present invention.
Fig. 2 is a schematic waveform diagram of a voltage set point of a high voltage generator according to an embodiment of the present invention.
Fig. 3 is a waveform diagram of a voltage set point of another high voltage generator according to an embodiment of the present invention.
Fig. 4 is a flowchart illustrating a process of generating a virtual error according to an embodiment of the present invention.
Detailed Description
To make the objects, advantages and features of the present invention more apparent, the following describes in further detail a voltage switching method for a high voltage generator, an X-ray imaging system and a dual-energy switching method for an X-ray imaging system according to the present invention. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention.
In the description of the present invention, the terms "first," "second," and the like, are added for convenience of description and reference, and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining a qualifier such as "first," "second," etc. may explicitly or implicitly include one or more such feature.
The overall block diagram of the CT system for realizing dual energy based on the instantaneous voltage technology is shown with reference to fig. 1, the CT system can send a voltage switching instruction to a CT high-voltage generator according to the self requirement, and a communication module in the CT high-voltage generator receives the voltage switching instruction and then carries out post-processing, so that a voltage set value, namely an instruction value, is generated and sent to a main power controller. The main power controller performs digital or analog closed-loop operation based on the real-time sampling signal and the voltage set value, generates a control signal, namely a switching tube driving signal, and sends the control signal to the main power circuit, an inversion switching tube in the main power circuit is controlled by the switching tube driving signal to perform high-frequency switching, and voltage meeting the requirement is generated through the power electronic converter and is output to the bulb tube.
The steady-state voltages corresponding to the high energy and the low energy in the dual energy are respectively high voltage kV_H and low voltage kV_L, and the shorter the time for switching from the low voltage kV_L to the high voltage kV_H or from the high voltage kV_H to the low voltage kV_L is, the better the dual-energy data can be separated.
In the prior art, the voltage set value of the CT high-voltage generator always changes in the [ kV_L, kV_H ] interval in the output voltage switching process, so that the switching speed of the actual output voltage is relatively slow.
The main inventive concept of the present invention can refer to fig. 2, in the phases t1 to t2 and t3 to t4, the CT system transmits a voltage switching command to switch from low voltage kv_l to high voltage kv_h to the high voltage generator; in the phases t2 to t3, the CT system sends a voltage switching command to the high voltage generator to switch from the high voltage kv_h to the low voltage kv_l. When the output voltage needs to be switched from the low voltage kV_L to the high voltage kV_H, the input error of the main power controller can be rapidly increased by briefly pulling the voltage set value up to exceed the high voltage kV_H, and the output of the main power controller is rapidly changed, so that the output voltage is rapidly increased. Similarly, when the output voltage needs to be switched from the high voltage kv_h to the low voltage kv_l, the main power controller can control the output voltage to drop rapidly by briefly pulling the voltage set point below the low voltage kv_l.
Referring to fig. 1 and 2, the present embodiment provides a voltage switching method of a high voltage generator, including the steps of:
S1, receiving a voltage switching instruction, wherein the voltage switching instruction comprises a target output voltage; the voltage switching instruction is used for indicating to switch the initial output voltage to the target output voltage; the voltage switching instruction can be sent to the high-voltage generator by the CT system; the initial output voltage and the target output voltage are both static values;
s2, determining a voltage control parameter according to the received voltage switching instruction, wherein the voltage control parameter comprises a target voltage set value; wherein the target voltage set point is a static value, the target voltage set point is an overshoot maximum in the voltage set point, the target voltage set point is not within the range of the initial output voltage and the target output voltage; the target voltage set value is obtained according to the voltage switching instruction and is used for switching the initial voltage to the target output voltage;
S3, adjusting the current output voltage according to the target voltage set value; wherein the absolute value of the voltage difference between the target voltage set value and the initial output voltage is greater than the absolute value of the voltage difference between the target output voltage and the initial output voltage. Wherein the current output voltage is a dynamic value; the target voltage set value is used for accelerating the change rate of the current output voltage so that the current output voltage becomes the target output voltage as soon as possible.
For example, the initial output voltage is a low voltage kv_l and kv_l=80 kV, the target output voltage is a high voltage kv_h and kv_h=140 kV, and the target voltage set value may be 150kV. At this time, the absolute value of the voltage difference between the target voltage set value and the initial output voltage is= |150kV-80 kv|=70 kV, and the absolute value of the voltage difference between the target output voltage and the initial output voltage is= |140kV-80 kv|=60 kV,70kV > 60kV. Since the target voltage set value is obtained according to the voltage switching command, the target voltage set value is used for switching the initial voltage to the target output voltage as soon as possible, so the target voltage set value cannot be smaller than the initial output voltage, namely 80kV.
Similarly, if the initial output voltage is a high voltage kv_h and kv_h=140 kV, the target output voltage is a low voltage kv_l and kv_l=80 kV, the target voltage setpoint may be 70kV, 75kV, or other lower voltage setpoint.
In this embodiment, for convenience of description, the target voltage set value and the target output voltage are explained according to 1:1, and the voltage set value and the target output voltage are also explained according to 1:1. On an actual analog-to-digital circuit, the target voltage set value and the target output voltage can be set according to other proportions, and the voltage set value and the target output voltage are set according to other proportions, for example, 1.4V (voltage set value) of the analog circuit corresponds to 140kV (target output voltage); or 1.4 (voltage set point) on the digital circuit corresponds to 140kV (target output voltage); i.e. when controlling on an actual circuit, if the target output voltage is 140kV, the corresponding voltage set point may be 140kV, 1.4V or other values. When the voltage set value and the target output voltage are not set according to 1:1, the ratio between the voltage set value and the target output voltage can be converted into 1:1 for processing.
In the voltage switching method of the high-voltage generator provided by the embodiment, at least one target voltage set value is set in the process of switching the initial output voltage to the target output voltage, and the absolute value of the voltage difference between the target voltage set value and the initial output voltage is larger than that of the voltage difference between the target output voltage and the initial output voltage, namely, the target voltage set value exceeds the range from the initial output voltage to the target output voltage and accelerates the change rate of the current output voltage, so that the switching of the initial output voltage to the target output voltage can be accelerated.
Optionally, referring to fig. 2, the voltage control parameter includes a voltage set point, and the method further includes the steps of: and adjusting the current output voltage to the target output voltage according to the voltage set value, wherein the voltage set value is determined to be equal to the target voltage set value in at least a period of time when the current output voltage is not switched to the target output voltage. The current output voltage is the real-time actual output voltage of the high-voltage generator, and the voltage set value is enabled to be equal to the target voltage set value in at least a period of time when the current output voltage is not switched to the target output voltage, so that the current output voltage is accelerated to be not switched to the target output voltage.
Optionally, the step of determining a voltage control parameter according to the received voltage switching command specifically includes the following steps:
If the initial output voltage is less than the target output voltage, determining that the target voltage set point is greater than the target output voltage; referring to fig. 3, if the initial output voltage is kv_l corresponding to time t1, the target output voltage is kv_h corresponding to time t2, and the target voltage set value may be a peak value of the voltage set value between time t1 and time t 2; the peak value is larger than the target output voltage, so that the current output voltage can be quickened to be regulated to the target output voltage;
And if the initial output voltage is greater than the target output voltage, determining that the target voltage set value is less than the target output voltage. Referring to fig. 3, if the initial output voltage is kv_h corresponding to time t2, the target output voltage is kv_l corresponding to time t3, and the target voltage set value may be a trough value of the voltage set value between time t2 and time t 3; the trough value is smaller than the target output voltage, so that the current output voltage can be quickened to be regulated to the target output voltage.
Optionally, referring to fig. 2 and 3, after the step of determining that the voltage set point is equal to the target voltage set point, the method further includes the steps of: determining that the voltage set point is equal to the target output voltage. In fig. 2 and 3, between the times t1 and t2, the constant voltage set value corresponding to the longer period after the peak value is equal to the target output voltage. And between the time t2 and the time t3, the constant voltage set value corresponding to the longer time after the trough value is equal to the target output voltage. The method provided by the embodiment can enable the final output voltage to be equal to the target output voltage and not larger than or smaller than the target output voltage, and the voltage output in real time does not exceed the range between the initial output voltage and the target output voltage at any time when the initial output voltage is switched to the target output voltage.
Optionally, during at least a period of time between the step of determining that the voltage set point is equal to the target voltage set point and the step of determining that the voltage set point is equal to the target output voltage, further comprising 5 the steps of:
If the initial output voltage is less than the target output voltage, determining that the voltage set point is less than the target output voltage; referring to FIG. 3, if the initial output voltage is kV_L corresponding to time t1, the target output voltage is kV_H corresponding to time t2, and the voltage is between time t1 and time t2
The set value is firstly set as a target voltage set value corresponding to the crest value, then gradually falls to the trough value, finally, 0 is changed into a constant voltage set value and is kept to the time t2, so that the current output voltage can be prevented from being regulated to be larger than the target output voltage;
If the initial output voltage is greater than the target output voltage, determining that the voltage set point is greater than the target output voltage. Referring to fig. 3, if the initial output voltage is kv_h corresponding to time t2, the target output voltage is kv_l corresponding to time t3, and the voltage 5 set value is set to the target voltage set value corresponding to the trough value before gradually rising to the peak value and finally again between time t2 and time t3
To a constant voltage set point and held to time t3, such a design prevents the current output voltage from being regulated to less than the target output voltage. In other embodiments, the voltage set point may be changed to a constant value after passing through a plurality of peak values and/or a plurality of valley values each time the initial output voltage is switched to the target output voltage.
0, Referring to fig. 2 and 3, the voltage switching command further includes a voltage switching start time t1 and a voltage switching completion time t2; at the voltage switching start time t1, the voltage set value is set to the target voltage set value. In the whole period of time for switching the initial output voltage to the target output voltage, the voltage set value is preferably set to the target voltage set value as early as possible, so that not only
To expedite the switching of the initial output voltage to the target output voltage and to prevent the final output 5 voltage from being overshot.
Optionally, referring to fig. 2, the ratio of the absolute value of the voltage difference between the target voltage set value and the initial output voltage to the absolute value of the voltage difference between the target output voltage and the initial output voltage ranges from 105% to 120%. The absolute value of the voltage difference between the target voltage set value and the initial output voltage can be represented by M, the absolute value of the voltage difference between the target output voltage and the initial output voltage can be represented by N, and the ratio range of M to N is 105% -120%, so that the switching of the initial output voltage to the target output voltage can be quickened, and the final output voltage can be prevented from being overshot.
Optionally, referring to fig. 2, the duration of the voltage set point equal to the target voltage set point is equal to a first duration, the duration of the voltage set point equal to the target output voltage is equal to a second duration, and the first duration is less than the second duration. Between times t1 and t2 in fig. 2, the first time period refers to a time period during which the peak value continues, and the second time period refers to a time period during which the voltage set value is equal to the target output voltage. The first time period is shorter than the second time period, so that the switching of the initial output voltage to the target output voltage can be quickened, and the final output voltage can be prevented from being overshot. In actual use, the duration of the overshoot portion is typically of the order of μs, for example, between times t1 and t2 in fig. 2, and the duration of the voltage set point greater than kv_h may be 5 μs to 20 μs.
Optionally, the step of determining a voltage control parameter according to the received voltage switching command specifically includes the following steps: and determining a voltage set point track corresponding to the current voltage switching instruction from preset voltage set point tracks according to the indication of the voltage switching instruction. The various voltage set point trajectories may be pre-stored in the high voltage generator, which may be in image format or in tabular format. The voltage switching instruction is used for indicating to switch the initial output voltage to the target output voltage, and the voltage switching instruction can also comprise information such as designated switching time and the like when the initial output voltage is indicated. For example, the voltage switching command is switched from 70kV to 100kV, and the switching time of the mode A is 1s; the voltage switching command of the B mode further comprises a switching time of 0.5 seconds; then different voltage set point trajectories can be selected according to different switching times, for example, for a voltage switching command with a switching time of 0.5 seconds, the voltage set point can be switched to the target voltage set point at the beginning of the voltage switching, adjusted to be less than the target output voltage after 0.2 seconds, and adjusted to be equal to the target output voltage after 0.4 seconds.
Optionally, the step of determining a voltage control parameter according to the received voltage switching command specifically includes the following steps: and acquiring the current output voltage in real time, and dynamically adjusting a voltage set value according to the difference value between the current output voltage and the target output voltage to change the current output voltage to the target output voltage. For example, when the output voltage is to be switched from 70kV to 100kV, the voltage set point may be set to 120kV first, and it is found that the current output voltage has reached 80kV in 0.3 seconds, and the step toward the target output voltage is still fast, and according to this, the voltage set point may be set to 90kV after 0.3 seconds; the current output voltage is found to reach 90kV at 0.4 seconds, at which time the voltage set point can be adjusted to 100kV again until it is held to the end of the voltage switching, for example, 0.5 seconds. In another embodiment, which is the same as the principle, assuming that the output voltage is to be switched from 100kV to 70kV, the voltage set value can be set to 60kV at first, the target voltage set value is gradually increased to 70kV after reaching 60kV, the current output voltage is found to reach 80kV in 0.2 seconds, and the step comparison ratio towards the target output voltage is carried out
The voltage set point can be set to 70kV5 after 0.2 seconds until it is kept to the end of the voltage switching, for example 0.5 seconds, depending on the situation.
Referring to fig. 4, the present embodiment provides another voltage switching method of a high voltage generator based on the same technical concept as the voltage switching method of a high voltage generator described above, including the steps of:
S11, receiving a voltage switching instruction, wherein the voltage switching instruction comprises a target output voltage, and the voltage switching instruction is used for indicating to switch an initial output voltage to the target output voltage;
0S12, acquiring a sampling value of the current output voltage;
s13, generating an error value according to the target output voltage and the sampling value;
S14, superposing the superposition value corresponding to the error value with the error value according to the error value and a preset superposition rule to obtain a virtual error; wherein the superposition rule is used for increasing the error value, and is used for generating a superposition rule
The larger virtual error is obtained, and a larger voltage set value can be obtained according to the virtual error; 5S15, determining a voltage control parameter according to the virtual error, wherein the voltage control parameter comprises a target voltage set value; the correspondence between the virtual error and the voltage control parameter may be stored in advance;
S16, adjusting the current output voltage according to the target voltage set value; wherein the absolute value of the voltage difference between the target voltage set value and the initial output voltage is greater than the absolute value of the voltage difference between the target output voltage and the initial output voltage.
0. The voltage switching method of the high voltage generator provided in this embodiment switches the initial output voltage to
In the process of the target output voltage, at least one target voltage set value is set, the absolute value of the voltage difference between the target voltage set value and the initial output voltage is larger than the absolute value of the voltage difference between the target output voltage and the initial output voltage, namely, the target voltage set value exceeds the range from the initial output voltage to the target output voltage and accelerates the change rate of the current output voltage, so that the initial output voltage can be accelerated to be switched to the target output voltage.
5 Referring to fig. 1, the same technical configuration as the voltage switching method of the above-mentioned high voltage generator is based on
The present embodiment provides a high voltage generator, including a controller for executing a voltage switching method of the high voltage generator described in any one of the above. The communication module and the main power controller in fig. 1 may be two independent components or may be one component integrated together. The controller corresponds to a component of fig. 1 where the communication module and the main power controller are integrated.
In the high voltage generator provided in this embodiment, in the process of switching the initial output voltage to the target output voltage, at least one target voltage set value is set, and the absolute value of the voltage difference between the target voltage set value and the initial output voltage is greater than the absolute value of the voltage difference between the target output voltage and the initial output voltage, i.e., the target voltage set value exceeds the range from the initial output voltage to the target output voltage and accelerates the change rate of the current output voltage, so that the switching of the initial output voltage to the target output voltage can be accelerated.
Based on the same technical conception as the voltage switching method of the high-voltage generator, the embodiment provides an X-ray imaging system comprising the high-voltage generator.
In the X-ray imaging system provided in this embodiment, in the process of switching the initial output voltage to the target output voltage, at least one target voltage set value is set, and the absolute value of the voltage difference between the target voltage set value and the initial output voltage is greater than the absolute value of the voltage difference between the target output voltage and the initial output voltage, i.e., the target voltage set value exceeds the range from the initial output voltage to the target output voltage and accelerates the change rate of the current output voltage, so that the switching of the initial output voltage to the target output voltage can be accelerated.
Based on the same technical concept as the voltage switching method of the high-voltage generator, the embodiment provides a dual-energy switching method of an X-ray imaging system, and the dual-energy switching method responds to a received X-ray energy switching instruction, wherein the X-ray energy switching instruction comprises a voltage switching instruction; the voltage switching method of the high-voltage generator is adopted to switch and output a target output voltage, wherein the target output voltage is used for being applied to a bulb tube, so that the bulb tube generates a target X-ray dose corresponding to the X-ray energy switching instruction.
The paying-off principle of the X-ray tube is as follows: the X-ray tube comprises a cathode and an anode, wherein the cathode is used for emitting filaments of electrons, and the anode is used for receiving a target bombarded by electrons. The X-ray tube may be a high vacuum glass or ceramic. The power supply part of the X-ray tube comprises a low voltage power supply for heating the filament and a high voltage generator for applying a high voltage to the two poles. When the filament is passed through a sufficient current to cause it to generate an electron cloud, and a sufficient voltage is applied between the anode and the cathode such that the electron cloud is pulled toward the anode. At this time, electrons strike the target material in a high-energy and high-speed state, the high-speed electrons reach the target surface, movement is suddenly prevented, a small part of kinetic energy of the electrons is converted into radiant energy, the radiant energy is emitted in the form of X-rays, and radiation generated in the form is called bremsstrahlung radiation. Changing the magnitude of the filament current can change the temperature of the filament and the amount of electrons emitted, thereby changing the magnitude of the tube current and the X-ray intensity. The dose of incident X-rays can be changed by changing the excitation potential of the X-ray tube or selecting different targets.
In the dual-energy switching method of the X-ray imaging system provided by the embodiment, at least one target voltage set value is set in the process of switching the initial output voltage to the target output voltage, and the absolute value of the voltage difference between the target voltage set value and the initial output voltage is larger than the absolute value of the voltage difference between the target output voltage and the initial output voltage, namely, the target voltage set value exceeds the range from the initial output voltage to the target output voltage and accelerates the change rate of the current output voltage, so that the switching from the initial output voltage to the target output voltage can be accelerated, and dual-energy data can be better separated.
In summary, in the voltage switching method of the high voltage generator, the X-ray imaging system and the dual-energy switching method of the X-ray imaging system provided by the invention, at least one target voltage set value is set in the process of switching the initial output voltage to the target output voltage, and the absolute value of the voltage difference between the target voltage set value and the initial output voltage is larger than the absolute value of the voltage difference between the target output voltage and the initial output voltage, i.e. the target voltage set value exceeds the range from the initial output voltage to the target output voltage and accelerates the change rate of the current output voltage, so that the switching of the initial output voltage to the target output voltage can be accelerated.
The above description is only illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, and any alterations and modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the present invention.
Claims (14)
1. A method for switching voltage of a high voltage generator, comprising the steps of:
Receiving a voltage switching instruction, wherein the voltage switching instruction comprises a target output voltage; the voltage switching instruction is used for indicating to switch the initial output voltage to the target output voltage;
determining a voltage control parameter according to the received voltage switching instruction, wherein the voltage control parameter comprises a target voltage set value;
According to the target voltage set value, adjusting the current output voltage; wherein the absolute value of the voltage difference between the target voltage set value and the initial output voltage is greater than the absolute value of the voltage difference between the target output voltage and the initial output voltage.
2. A method of switching a voltage of a high voltage generator according to claim 1, wherein said voltage control parameter comprises a voltage set point, said method further comprising the steps of: and adjusting the current output voltage to the target output voltage according to the voltage set value, wherein the voltage set value is determined to be equal to the target voltage set value in at least a period of time when the current output voltage is not switched to the target output voltage.
3. The method for switching voltage of a high voltage generator according to claim 2, wherein said step of determining a voltage control parameter according to said received voltage switching command comprises the steps of:
if the initial output voltage is less than the target output voltage, determining that the target voltage set point is greater than the target output voltage;
and if the initial output voltage is greater than the target output voltage, determining that the target voltage set value is less than the target output voltage.
4. A method of switching a voltage of a high voltage generator according to claim 3, further comprising, after the step of determining that the voltage set point is equal to the target voltage set point, the steps of: determining that the voltage set point is equal to the target output voltage.
5. The method of switching a voltage of a high voltage generator according to claim 4, further comprising, during at least a period of time between the step of determining that the voltage set point is equal to the target voltage set point and the step of determining that the voltage set point is equal to the target output voltage, the steps of:
if the initial output voltage is less than the target output voltage, determining that the voltage set point is less than the target output voltage;
If the initial output voltage is greater than the target output voltage, determining that the voltage set point is greater than the target output voltage.
6. The method of switching voltage of a high voltage generator according to claim 2, wherein the voltage switching command further includes a voltage switching start time and a voltage switching completion time; at the start of the voltage switching 5, the voltage set point is set to the target voltage set point.
7. The voltage switching method of a high voltage generator according to claim 1, wherein a ratio of an absolute value of a voltage difference between the target voltage set value and the initial output voltage to an absolute value of a voltage difference between the target output voltage and the initial output voltage ranges from 105% to 120%.
8. The method of switching a voltage of a high voltage generator according to claim 2, wherein the duration of the voltage set point equal to the target voltage set point is equal to a first duration, the duration of the voltage set point equal to the target output voltage is equal to a second duration, and the first duration is less than the second duration.
9. The method for switching voltage of a high voltage generator according to claim 2, wherein said step of determining a voltage control parameter according to said received voltage switching command comprises the steps of:
and determining a voltage set point track corresponding to the current voltage switching instruction from preset voltage set point tracks according to the indication of the voltage switching instruction.
10. A voltage switching method for a high voltage generator according to claim 2 wherein,
The step of determining the voltage control parameter according to the received voltage switching instruction specifically comprises the following steps of: and acquiring the current output voltage in real time, and dynamically adjusting a voltage set value according to the difference value between the current output voltage and the target output voltage to change the current output voltage to the target output voltage.
11. A method for switching voltage of a high voltage generator, comprising the steps of:
Receiving a voltage switching instruction, wherein the voltage switching instruction comprises a target output voltage, and the voltage switching instruction is used for indicating to switch an initial output voltage to the target output voltage;
5, obtaining a sampling value of the current output voltage;
Generating an error value according to the target output voltage and the sampling value;
Superposing the superposition value corresponding to the error value with the error value according to the error value and a preset superposition rule to obtain a virtual error;
determining a voltage control parameter according to the virtual error, wherein the voltage control parameter comprises a target voltage set value;
According to the target voltage set value, adjusting the current output voltage; wherein the absolute value of the voltage difference between the target voltage set value and the initial output voltage is greater than the absolute value of the voltage difference between the target output voltage and the initial output voltage.
12. A high voltage generator comprising a controller for performing a method of switching a voltage of a high voltage generator according to any one of claims 1-11.
13. An X-ray imaging system comprising a high voltage generator according to claim 12.
14. A dual energy switching method of an X-ray imaging system, characterized in that in response to a received X-ray energy switching instruction, the X-ray energy switching instruction comprises a voltage switching instruction; a voltage switching method employing a high voltage generator according to any one of claims 1-11 for switching output of a target output voltage for application to a bulb for generating a target X-ray dose corresponding to the X-ray energy switching command.
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