CN113162416B - Multi-path independent high-voltage output device, X-ray equipment and control method - Google Patents
Multi-path independent high-voltage output device, X-ray equipment and control method Download PDFInfo
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- CN113162416B CN113162416B CN202110508687.XA CN202110508687A CN113162416B CN 113162416 B CN113162416 B CN 113162416B CN 202110508687 A CN202110508687 A CN 202110508687A CN 113162416 B CN113162416 B CN 113162416B
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000000725 suspension Substances 0.000 claims abstract description 19
- 239000003990 capacitor Substances 0.000 claims description 37
- 238000005339 levitation Methods 0.000 claims description 36
- 238000004804 winding Methods 0.000 claims description 16
- 238000004364 calculation method Methods 0.000 claims description 11
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Classifications
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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
Abstract
The present disclosure provides a multi-path independent high voltage output device outputting a plurality of high voltages through a plurality of independent high voltage output loops, and the plurality of high voltages are respectively provided to a plurality of X-ray tubes of an X-ray device, comprising: an inverter converting an input dc voltage into a first ac voltage; a plurality of transformers, each transformer including a primary coil receiving a first ac voltage and a secondary coil outputting a second ac voltage based on the first ac voltage, the second ac voltage having a voltage magnitude greater than a voltage magnitude of the first ac voltage; the plurality of suspension control switches are respectively connected to the primary coil sides of the plurality of transformers, and the second alternating voltage output by the secondary coil of each transformer is independently controlled through the on-off of the suspension control switch; and a control unit for providing switch control signals of the plurality of suspension control switches. The present disclosure also provides an X-ray apparatus and a control method.
Description
Technical Field
The present disclosure provides a multi-path independent high voltage output device, an X-ray apparatus, and a control method.
Background
In the prior art, in order to independently supply power to a plurality of X-ray tubes, a plurality of independent high-voltage power supply devices or a plurality of output high-voltage devices are generally adopted, and high-voltage switching devices are connected in series at a high-voltage output side to realize independent power supply of the plurality of X-ray tubes.
In the case of supplying power by using a plurality of independent high-voltage power supply devices, although independent power supply to a plurality of X-ray tubes can be realized, the number of high-voltage X-ray devices is required to be increased as the number of X-ray tubes is increased. This approach will therefore multiply the overall system volume and cost of the device.
Under the condition that the high-voltage output side is connected with the high-voltage switching equipment in series to realize independent power supply of a plurality of ray tubes, the high-voltage output side is connected with the high-voltage switch in series, so that high requirements on voltage resistance, a driving circuit and the like of the high-voltage switch are met. The high-voltage switch is generally realized by adopting a vacuum thyratron device or a plurality of semiconductor devices such as IGBT (or thyristor) and the like in series-parallel connection. In any way, the overall size of the high-voltage switch is larger, and the high-voltage insulation treatment is needed to be carried out on the switch, so that the size of the X-ray equipment cannot be well reduced in the way, on the contrary, the system structure of the whole machine is more complex because a severe high-voltage isolation driving circuit is needed for the high-voltage switch, and the cost is even higher because of the cost problem of the high-voltage switch system. Therefore, the scheme is not used in the X-ray equipment, so that the X-ray equipment with small volume and low cost cannot be realized, the system design is more complicated, and the difficulty of the production process of the X-ray equipment is greatly increased.
Disclosure of Invention
In order to solve one of the above technical problems, the present disclosure provides a multi-path independent high-voltage output device, an X-ray apparatus, and a control method.
According to an aspect of the present disclosure, there is provided a multi-path independent high voltage output device that outputs a plurality of high voltages through a plurality of independent high voltage output loops, and that is provided to a plurality of X-ray tubes of an X-ray device, respectively, the multi-path independent high voltage output device including:
an inverter for converting an input dc voltage into a first ac voltage;
a plurality of transformers, each transformer including a primary coil and a secondary coil, and the primary coil of each transformer receiving the first alternating voltage and, based on the first alternating voltage, the secondary coil of each transformer outputting a second alternating voltage, wherein a voltage magnitude of the second alternating voltage is greater than a voltage magnitude of the first alternating voltage;
a plurality of levitation control switches connected to primary coil sides of the plurality of transformers, respectively, so as to independently control a second ac voltage output from a secondary coil of each transformer by switching on and off the levitation control switches;
and the control unit is used for providing switch control signals of the suspension control switches so as to control the on-off of the suspension control switches respectively.
According to at least one embodiment of the present disclosure, the number of inverters is one, and the one inverter supplies the first alternating voltage to the primary windings of the plurality of transformers.
According to at least one embodiment of the present disclosure, the power supply further includes a plurality of voltage doubler rectification circuits respectively connected to the secondary windings of the plurality of transformers so as to convert the second ac voltage output from the secondary windings of the plurality of transformers into a dc high voltage so as to supply power to the plurality of X-ray tubes.
According to at least one embodiment of the present disclosure, the inverter includes a BUCK circuit for converting an input dc voltage into an intermediate dc voltage, and an LLC circuit for converting the intermediate dc voltage into the first ac voltage, and the intermediate dc voltage is provided to the LLC circuit.
According to at least one embodiment of the present disclosure, the BUCK circuit includes a BUCK switch, the control unit provides a driving signal for controlling the BUCK switch, the control unit receives output voltages and/or output currents outputted from a plurality of independent high voltage output circuits, performs PID control calculation on the output voltages of the BUCK circuit, and changes the driving signal of the BUCK switch according to the calculation result so that the second ac voltage outputted from the secondary winding of each transformer is stabilized.
According to at least one embodiment of the present disclosure, the driving signal of the BUCK switch is a driving signal with a fixed frequency and an adjustable duty cycle, and the intermediate dc voltage is adjusted by adjusting the duty cycle of the driving signal.
According to at least one embodiment of the present disclosure, the BUCK circuit includes a first switch, a first diode, a first inductor, and a first capacitor, a first end of the first switch is connected to a positive end of an input dc voltage, a second end of the first switch is connected to the first end of the first inductor and the first end of the first diode, a second end of the first diode is connected to a negative end of the input dc voltage, the second end of the first inductor serves as an output end of the BUCK circuit, and the first capacitor is connected between the second end of the first inductor and the negative end of the input dc voltage.
According to at least one embodiment of the present disclosure, the LLC circuit includes a second capacitor, a third capacitor, a second switch, a third switch, a resonant capacitor, and a resonant inductor, a series circuit of the second capacitor and the third capacitor is connected to an output terminal of the BUCK circuit, a series circuit of the second switch and the third switch is connected to an output terminal of the BUCK circuit, and a connection point of the second switch and the third switch is connected to a first terminal of the series circuit of the resonant capacitor and the resonant inductor, a second terminal of the series circuit of the resonant capacitor and the resonant inductor is connected to first terminals of primary coils of the plurality of transformers, respectively, via the plurality of levitation control switches, and a connection point of the second capacitor and the third capacitor is connected to a second terminal of the primary coils of the plurality of transformers, respectively.
According to at least one embodiment of the present disclosure, the control unit provides driving signals of the second and third switches, and the driving signals of the second and third switches are driving signals having a fixed frequency and duty ratio.
According to at least one embodiment of the present disclosure, the plurality of levitation control switches are selected from any of IGBT switches, MOS transistor switches, or thyristor switches.
According to another aspect of the present disclosure, there is provided an X-ray apparatus comprising:
a multiple independent high voltage output device as claimed in any one of the preceding claims; and
and a plurality of X-ray tubes to which the plurality of high voltages outputted from the plurality of independent high voltage output devices are respectively supplied, and the high voltages supplied to the plurality of X-ray tubes are respectively controlled by independent control of a plurality of levitation control switches.
According to still another aspect of the present disclosure, there is provided a control method of a multi-path independent high-voltage output apparatus as set forth in any one of the above, including:
the control unit is used for controlling the on and off of the BUCK circuit switch, the LLC circuit switch and the suspension control switch at least according to the high-voltage output voltage values of the multi-path independent high-voltage output device;
collecting output voltages and/or output currents of a plurality of independent high-voltage output loops, and performing PID control calculation on the output voltages and/or currents of the BUCK circuit by the control unit according to the collected output voltages and/or currents; and
the control unit adjusts a duty ratio of a driving signal supplied to the BUCK circuit switch.
According to at least one embodiment of the present disclosure, the drive signal of the BUCK circuit switch is a fixed frequency and duty cycle adjustable drive signal, and the drive signal of the LLC circuit switch is a fixed frequency and duty cycle fixed drive signal.
According to at least one embodiment of the present disclosure, the control unit controls the plurality of levitation control switches according to a voltage value of a high-voltage output inputted from the outside, an operation timing, a desired operation frequency and/or a desired duty ratio.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.
Fig. 1 shows a schematic block diagram of a multiple independent high voltage output device according to one embodiment of the present disclosure.
Fig. 2 shows a schematic circuit diagram of a multiple independent high voltage output device according to one embodiment of the present disclosure.
Fig. 3 shows a flowchart of a control method according to one embodiment of the present disclosure.
Fig. 4 shows a flowchart of a control method according to one embodiment of the present disclosure.
Detailed Description
The present disclosure is described in further detail below with reference to the drawings and the embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant content and not limiting of the present disclosure. It should be further noted that, for convenience of description, only a portion relevant to the present disclosure is shown in the drawings.
In addition, embodiments of the present disclosure and features of the embodiments may be combined with each other without conflict. The technical aspects of the present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Unless otherwise indicated, the exemplary implementations/embodiments shown are to be understood as providing exemplary features of various details of some ways in which the technical concepts of the present disclosure may be practiced. Thus, unless otherwise indicated, features of the various implementations/embodiments may be additionally combined, separated, interchanged, and/or rearranged without departing from the technical concepts of the present disclosure.
The use of cross-hatching and/or shading in the drawings is typically used to clarify the boundaries between adjacent components. As such, the presence or absence of cross-hatching or shading does not convey or represent any preference or requirement for a particular material, material property, dimension, proportion, commonality between illustrated components, and/or any other characteristic, attribute, property, etc. of a component, unless indicated. In addition, in the drawings, the size and relative sizes of elements may be exaggerated for clarity and/or descriptive purposes. While the exemplary embodiments may be variously implemented, the specific process sequences may be performed in a different order than that described. For example, two consecutively described processes may be performed substantially simultaneously or in reverse order from that described. Moreover, like reference numerals designate like parts.
When an element is referred to as being "on" or "over", "connected to" or "coupled to" another element, it can be directly on, connected or coupled to the other element or intervening elements may be present. However, when an element is referred to as being "directly on," "directly connected to," or "directly coupled to" another element, there are no intervening elements present. For this reason, the term "connected" may refer to physical connections, electrical connections, and the like, with or without intermediate components.
For descriptive purposes, the present disclosure may use spatially relative terms such as "under … …," under … …, "" under … …, "" lower, "" above … …, "" upper, "" above … …, "" higher "and" side (e.g., as in "sidewall"), etc., to describe one component's relationship to another (other) component as illustrated in the figures. In addition to the orientations depicted in the drawings, the spatially relative terms are intended to encompass different orientations of the device in use, operation, and/or manufacture. For example, if the device in the figures is turned over, elements described as "under" or "beneath" other elements or features would then be oriented "over" the other elements or features. Thus, the exemplary term "below" … … can encompass both an orientation of "above" and "below". Furthermore, the device may be otherwise positioned (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, when the terms "comprises" and/or "comprising," and variations thereof, are used in the present specification, the presence of stated features, integers, steps, operations, elements, components, and/or groups thereof is described, but the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof is not precluded. It is also noted that, as used herein, the terms "substantially," "about," and other similar terms are used as approximation terms and not as degree terms, and as such, are used to explain the inherent deviations of measured, calculated, and/or provided values that would be recognized by one of ordinary skill in the art.
According to one embodiment of the present disclosure, a multiple independent high voltage output device is provided. In the following description, the term "plurality" as used in this disclosure means "two or more than two".
Fig. 1 shows a schematic diagram of a multiple independent high voltage output device 10 according to one embodiment of the present disclosure.
As shown in fig. 1, the multi-path independent high voltage output device 10 outputs a plurality of high voltages through a plurality of independent high voltage output circuits, and the plurality of high voltages are respectively supplied to a plurality of X-ray tubes 20 of the X-ray device, for example, the high voltages are supplied to the X-ray tubes 20 one-to-one.
The multiple independent high voltage output apparatus 10 may include an inverter 100, a transformer 200 with a levitation control switch, and a control unit 300.
The inverter 100 may receive a direct current voltage, for example, from a voltage source, and convert the input direct current voltage into a first alternating current voltage. Wherein a control switch may be included in the inverter 100 and may be turned on or off according to a switch control signal of the control unit, thereby converting a direct current voltage into an alternating current voltage.
The number of transformers 200 with levitation control switches may be plural, for example, in fig. 1 there is shown a transformer 200 comprising n number of transformers 200 with levitation control switches, where n > 1.
Each of the transformers 200 with levitation control switches can include one levitation control switch and one transformer. Each transformer includes a primary coil and a secondary coil, and the primary coil of each transformer receives a first alternating voltage and, based on the first alternating voltage, the secondary coil of each transformer outputs a second alternating voltage, wherein a voltage magnitude of the second alternating voltage is greater than a voltage magnitude of the first alternating voltage. The suspension control switch is connected with the output end of the inverter and the primary coil side of the transformers, and the second alternating voltage output by the secondary coil of each transformer is independently controlled through the on-off of the suspension control switch. The control unit provides switch control signals of the suspension control switches so as to control the on-off of the suspension control switches respectively.
The control unit 300 may be a digital control module and provide digital driving signals for the switches of the inverter and the levitation control switches, for example, PWM (pulse width modulation) signals may be provided. The switching on and off of the inverter and the levitation control switch is thus achieved by the driving signal provided by the control unit 300, so that the modulated output voltage can be changed. The digital control module can be in the form of a DSP or an FPGA.
In the present disclosure, the number of inverters 100 may be one, that is, the first ac voltage is supplied to the primary windings of the plurality of transformers 200 through one inverter.
The levitation control switches in each of the transformers 200 with levitation control switches can be in the form of a single switch, for example the levitation control switches can be selected from IGBT switches, MOS transistor switches and thyristor switches.
According to the embodiment of the disclosure, since the levitation control switch is arranged on the primary side of the transformer, the working voltage born by the levitation control switch is low, so that the selection range of the levitation control switch is wide, and a single IGBT, MOS tube or thyristor and the like can be selected as the levitation control switch to realize switch control. And the control function is realized through a single switch, and the corresponding driving circuit can be simple and reliable, so that the safety and reliability of the system operation are further ensured.
The single IGBT, MOS tube or thyristor is used as the suspension control switch, the driving circuit is simple, so that the suspension control switch circuit can be conveniently integrated in the PCB (printed circuit board) of the main loop. Thus, the volume of the multi-path independent high-voltage output X-ray device is basically the same as that of a traditional single high-voltage output X-ray device, and the whole system volume and weight can be greatly reduced when the device according to the present disclosure is used in X-ray equipment needing to use a plurality of X-ray tubes, and different use scene requirements of the X-ray equipment can be easily met.
Because the suspension control switch can adopt a single IGBT, MOS tube or thyristor, etc. as the suspension control switch, when independent high voltage is required to be multiplexed out, the cost is reduced by at least 1 time compared with the traditional multi-high-voltage X-ray device or the existing high-voltage serial high-voltage switch technology. Therefore, according to the X-ray equipment disclosed by the application, the cost of the X-ray equipment can be greatly reduced, and the popularization and the use of the X-ray equipment are facilitated.
According to a further embodiment of the present disclosure, the multi-path independent high voltage output apparatus 10 may further include a voltage doubler rectification circuit 400, wherein an output terminal of each transformer may be connected to one voltage doubler rectification circuit. Such a plurality of voltage doubler rectification circuits are respectively connected to the secondary windings of the plurality of transformers so as to convert the second ac voltage outputted from the secondary windings of the plurality of transformers into a dc high voltage so as to supply power to the plurality of X-ray tubes 20.
Fig. 2 shows a schematic circuit diagram of the multiple independent high voltage output device 10 according to an embodiment of the present disclosure.
In the present disclosure, the inverter is designed to cooperate with the levitation control switch to implement multiple independent high voltage output devices.
The inverter 100 includes a BUCK circuit (BUCK conversion circuit) for converting an input dc voltage into an intermediate dc voltage and the intermediate dc voltage is supplied to an LLC circuit (resonant circuit) for converting the intermediate dc voltage into a first ac voltage.
As shown in fig. 2, the BUCK circuit may include a first switch 101, a first diode 102, a first inductor 103, and a first capacitor 104, a first terminal of the first switch 101 is connected to a positive terminal of an input dc voltage Vin, a second terminal of the first switch 101 is connected to the first terminal of the first inductor and the first terminal of the first diode 102, a second terminal of the first diode 102 is connected to a negative terminal of the input dc voltage, a second terminal of the first inductor 103 is an output terminal of the BUCK circuit, and a first capacitor 104 is connected between the second terminal of the first inductor 103 and the negative terminal of the input dc voltage, such that the first inductor 103 and the first capacitor 104 form a low-pass filter, thereby allowing a dc component of the dc voltage Vin to pass and suppressing a harmonic component. A capacitor 111 may also be connected between the two inputs of the dc voltage.
In the present disclosure, the first switch 101, the first diode 102, the first inductance 103 and the first capacitance 104 constitute a one-stage BUCK circuit, the output of which supplies the bus of the LLC circuit. The driving signal of the first switch 101 of the BUCK circuit may be provided by the control unit 300. The driving signal provided by the control unit 300 may be a driving signal with a fixed frequency and an adjustable duty cycle, and the adjustment of the output voltage value of the BUCK circuit is achieved by the adjustment of the duty cycle of the driving signal.
In the present disclosure, the control unit may collect multiple high voltage output signals (voltages and/or currents) output by the multiple transformers or output by the voltage doubler rectification circuit, and perform PID control calculation on the voltages and/or currents output by the BUCK circuit, so as to change the duty ratio of the driving signal of the first switch 101 to stabilize the voltages and/or currents of the multiple high voltage outputs.
As shown in fig. 2, the LLC circuit may include a second capacitor 105, a third capacitor 106, a second switch 107, a third switch 108, a resonance capacitor 109, and a resonance inductance 110.
The second capacitor 105, the third capacitor 106, the second switch 107, and the third switch 108 constitute a bridge circuit, and the resonance capacitor 109 and the resonance inductance 110 constitute a resonance circuit.
In the bridge circuit, a series circuit of the second capacitor 105 and the third capacitor 106 is connected to an output terminal of the BUCK circuit, a series circuit of the second switch 107 and the third switch 108 is connected to an output terminal of the BUCK circuit, and a connection point of the second switch 107 and the third switch 108 is connected to a first terminal of a series circuit of the resonance capacitor 109 and the resonance inductor 110, a second terminal of the series circuit of the resonance capacitor 109 and the resonance inductor 110 is connected to first terminals of primary coils of the plurality of transformers 221, 222, …, 22n via the plurality of levitation control switches 211, 212, …, 21n, respectively, and a connection point of the second capacitor 105 and the third switch 106 is connected to a second terminal of the primary coils of the plurality of transformers, respectively.
The control unit 300 supplies the driving signals of the second switch 107 and the third switch 108, and the driving signals of the second switch 107 and the third switch 108 are driving signals with fixed frequency and duty ratio. Wherein the drive signals of the second switch 107 and the third switch 108 may be set in the control unit in a preset manner. The LLC circuit converts the direct-current voltage output by the BUCK circuit into an alternating-current signal with fixed frequency and duty ratio, and the alternating-current signal is transmitted to a primary coil of a transformer through a suspension control switch.
In each transformer 200 with levitation control switches, one end of the levitation control switch 211, 212, …, 21n is connected to an output terminal of the resonant circuit and the other end is connected to one side of a primary coil of the transformer.
The control unit 300 may control the selection (on or off), the operation timing, the operation frequency, and/or the duty ratio of the levitation control switches 211, 212, …, 21n, thereby implementing independent control of the multiple high-voltage outputs. The operating logic of the transformer, which converts the voltage of the primary winding into a multiplexed isolated high voltage, can thus be controlled by the levitation control switches 211, 212, …, 21 n. Finally, the secondary winding of each transformer is connected to a voltage doubler rectifier 401, 402, …, 40n, respectively, so as to convert the ac high voltage output by the secondary winding into a dc voltage, and provide the dc voltage to the corresponding X-ray tube 20.
In the present disclosure, the control unit controls the levitation control switch to control the working logic of the transformer, so that the requirements of a plurality of X-ray tubes in the X-ray device for different high voltages can be satisfied, and the driving signals provided by the control unit to the plurality of levitation control switches can change the working time sequence, the working frequency, the duty ratio, etc. according to the requirements, so that independent control of multiple output voltages can be realized.
By the multi-path independent high-voltage output device 10, a BUCK-LLC cascade type multi-path independent high-voltage output mode with a suspension control switch on a primary coil of a high-voltage transformer is provided, so that the whole cost of X-rays can be truly reduced, and meanwhile, the size and the weight of X-ray equipment are reduced, and the device has extremely high practicability.
According to a further embodiment of the present disclosure, a control method of the above-mentioned multiple independent high-voltage output device is also provided.
Fig. 3 shows a flow chart of the control method S100.
The control method S100 may include steps S102 to S108.
In step S102, the operation of the switch may be controlled according to the requirements of the system. The control unit can control the switch in the BUCK circuit in a mode of fixed frequency and adjustable duty ratio, and can control the switch in the LLC circuit in a mode of fixed frequency and fixed duty ratio.
For the control of the levitation control switch, the control unit may receive an instruction of the X-ray apparatus, where the instruction may include a voltage value of the high-voltage output, an operation timing of the multi-path high-voltage output control, an operation frequency, and a requirement of the duty ratio.
In step S104, PID control calculation may be performed on the output voltage and/or current of the BUCK circuit, and a driving signal provided to the switch of the BUCK circuit may be adjusted according to the calculation result, for example, the duty ratio of the driving signal may be adjusted, so that the voltage and current of the multiple high-voltage outputs may be stabilized. In step S104, PID control operation may be performed according to the output signals of the multiple independent high-voltage outputs collected in step S108.
In step S106, multiple high voltage outputs are provided to power the plurality of X-ray tubes, and independent control of the multiple high voltage outputs may be achieved.
Fig. 4 illustrates a control method 200 of the above-described multiple independent high voltage output device according to one embodiment of the present disclosure.
As shown in fig. 4, after the X-ray apparatus is operated, it is first determined in step S202 whether there is a failure in initialization. If there is a fault, go to step S216 and the system will shut down.
If it is determined in step S202 that there is no failure in the initialization, a requirement for high voltage output is acquired in step S204, and the requirement may include, for example, a requirement for outputting several high voltages, operation timings, a requirement for an output voltage value, a current value, and the like.
In step S206, the control unit may respond according to the high voltage output requirement, so as to output a driving signal of each switch, so as to drive the switch to operate.
In step S208, it is determined whether the high voltage output device has a fault, if so, the process goes to step S216, if not, in step S210, PID control calculation may be performed on the output voltage and/or current of the BUCK circuit, and the driving signal provided to the switch of the BUCK circuit may be adjusted according to the calculation result, for example, the duty ratio of the driving signal may be adjusted, so that the voltage and current of the multi-path high voltage output may be stabilized. In step S210, PID control operation may be performed according to the output signals of the multiple independent high-voltage outputs collected in step S214. In step S212, multiple high voltage outputs are provided to power the plurality of X-ray tubes, and independent control of the multiple high voltage outputs may be achieved.
According to a further embodiment of the present disclosure, there is also provided an X-ray apparatus. The X-ray equipment can comprise the multi-channel independent high-voltage output device; a plurality of X-ray tubes.
Wherein the plurality of high voltages output by the plurality of independent high voltage output devices are respectively supplied to the plurality of X-ray tubes, and the high voltages supplied to the plurality of X-ray tubes are respectively controlled by independent control of the plurality of levitation control switches.
In the description of the present specification, reference to the terms "one embodiment/manner," "some embodiments/manner," "example," "a particular example," "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/manner or example is included in at least one embodiment/manner or example of the application. In this specification, the schematic representations of the above terms are not necessarily for the same embodiment/manner or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/modes or examples described in this specification and the features of the various embodiments/modes or examples can be combined and combined by persons skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only 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 first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
It will be appreciated by those skilled in the art that the above-described embodiments are merely for clarity of illustration of the disclosure, and are not intended to limit the scope of the disclosure. Other variations or modifications will be apparent to persons skilled in the art from the foregoing disclosure, and such variations or modifications are intended to be within the scope of the present disclosure.
Claims (14)
1. A multi-path independent high voltage output apparatus which outputs a plurality of high voltages through a plurality of independent high voltage output circuits and which is provided to a plurality of X-ray tubes of an X-ray apparatus, respectively, characterized in that the multi-path independent high voltage output apparatus comprises:
an inverter for converting an input dc voltage into a first ac voltage;
a plurality of transformers, each transformer including a primary coil and a secondary coil, and the primary coil of each transformer receiving the first alternating voltage and, based on the first alternating voltage, the secondary coil of each transformer outputting a second alternating voltage, wherein a voltage magnitude of the second alternating voltage is greater than a voltage magnitude of the first alternating voltage;
a plurality of levitation control switches connected to primary coil sides of the plurality of transformers, respectively, so as to independently control a second ac voltage output from a secondary coil of each transformer by switching on and off the levitation control switches;
and the control unit is used for providing switch control signals of the suspension control switches so as to control the on-off of the suspension control switches respectively.
2. The apparatus of claim 1, wherein the number of inverters is one, the one inverter providing the first ac voltage to the primary windings of the plurality of transformers.
3. The apparatus of claim 1, further comprising a plurality of voltage doubler rectification circuits respectively connected to secondary windings of the plurality of transformers for converting a second ac voltage output by the secondary windings of the plurality of transformers to a dc high voltage for powering the plurality of X-ray tubes.
4. The apparatus of claim 1, wherein the inverter comprises a BUCK circuit to convert an input dc voltage to an intermediate dc voltage and the intermediate dc voltage is provided to the LLC circuit, and an LLC circuit to convert the intermediate dc voltage to the first ac voltage.
5. The apparatus of claim 4, wherein the BUCK circuit includes a BUCK switch, the control unit provides a driving signal for controlling the BUCK switch, the control unit receives output voltages and/or output currents outputted from a plurality of independent high-voltage output circuits, performs PID control calculation on the output voltages of the BUCK circuit, and changes the driving signal of the BUCK switch according to the calculation result so that the second alternating voltage outputted from the secondary winding of each transformer is stabilized.
6. The apparatus of claim 5, wherein the drive signal of the BUCK switch is a fixed frequency and duty cycle adjustable drive signal, the intermediate dc voltage being adjusted by adjusting the duty cycle of the drive signal.
7. The apparatus of claim 6, wherein the BUCK circuit includes a first switch, a first diode, a first inductor, and a first capacitor, a first terminal of the first switch being connected to a positive terminal of the input dc voltage, a second terminal of the first switch being connected to the first terminal of the first inductor and the first terminal of the first diode, a second terminal of the first diode being connected to a negative terminal of the input dc voltage, the second terminal of the first inductor being an output terminal of the BUCK circuit, and the first capacitor being connected between the second terminal of the first inductor and the negative terminal of the input dc voltage.
8. The apparatus of claim 4, wherein the LLC circuit includes a second capacitor, a third capacitor, a second switch, a third switch, a resonant capacitor, and a resonant inductance, the series circuit of the second capacitor and the third capacitor being connected at the output of the BUCK circuit, the series circuit of the second switch and the third switch being connected at the output of the BUCK circuit, and a connection point of the second switch and the third switch being connected to a first end of the series circuit of the resonant capacitor and the resonant inductance, a second end of the series circuit of the resonant capacitor and the resonant inductance being connected to a first end of the primary windings of the plurality of transformers, respectively, via the plurality of levitation control switches, a connection point of the second capacitor and the third capacitor being connected to a second end of the primary windings of the plurality of transformers, respectively.
9. The apparatus of claim 8, wherein the control unit provides drive signals for the second and third switches, and the drive signals for the second and third switches are drive signals of fixed frequency and duty cycle.
10. The apparatus of any one of claims 1 to 9, wherein the plurality of levitation control switches are selected from any one of IGBT switches, MOS transistor switches, or thyristor switches.
11. An X-ray apparatus, comprising:
a multiple independent high voltage output device according to any one of claims 1 to 10; and
and a plurality of X-ray tubes to which the plurality of high voltages outputted from the plurality of independent high voltage output devices are respectively supplied, and the high voltages supplied to the plurality of X-ray tubes are respectively controlled by independent control of a plurality of levitation control switches.
12. A control method of the multiple independent high-voltage output apparatus according to any one of claims 4 to 9, comprising:
the control unit is used for controlling the on and off of the BUCK circuit switch, the LLC circuit switch and the suspension control switch at least according to the high-voltage output voltage values of the multi-path independent high-voltage output device;
collecting output voltages and/or output currents of a plurality of independent high-voltage output loops, and performing PID control calculation on the output voltages and/or currents of the BUCK circuit by the control unit according to the collected output voltages and/or currents; and the control unit adjusts a duty ratio of a driving signal supplied to the BUCK circuit switch.
13. The control method according to claim 12, wherein the drive signal of the BUCK circuit switch is a fixed frequency and duty cycle adjustable drive signal, and the drive signal of the LLC circuit switch is a fixed frequency and duty cycle fixed drive signal.
14. The control method according to claim 13, wherein the control unit controls the plurality of levitation control switches according to a voltage value of a high-voltage output inputted from the outside, an operation timing, a desired operation frequency and/or a desired duty ratio.
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