CN110269634B - Isolation converter, X-ray generating device and medical imaging system - Google Patents
Isolation converter, X-ray generating device and medical imaging system Download PDFInfo
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- CN110269634B CN110269634B CN201910536947.7A CN201910536947A CN110269634B CN 110269634 B CN110269634 B CN 110269634B CN 201910536947 A CN201910536947 A CN 201910536947A CN 110269634 B CN110269634 B CN 110269634B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/40—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis
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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
Abstract
The invention provides an isolation converter which comprises a power conversion circuit, a first sampling circuit and a second sampling circuit, wherein the power conversion circuit comprises an isolation transformer circuit and a control circuit, the input ends of the first sampling circuit and the second sampling circuit are connected with the isolation transformer circuit, and the output ends of the first sampling circuit and the second sampling circuit are connected with the control circuit; the first sampling circuit comprises a high-speed analog-to-digital converter, the second sampling circuit comprises a low-speed analog-to-digital converter, and the isolation transformer circuit is respectively connected to the control circuit through the high-speed analog-to-digital converter and the low-speed analog-to-digital converter. The invention also provides a medical imaging system and X-ray generating equipment applying the isolation converter. The isolation converter provided by the invention can comprehensively consider the hardware cost on the premise of ensuring the control performance, and has wide application prospect.
Description
Technical Field
The invention relates to the technical field of medical imaging, in particular to an isolation converter, X-ray generating equipment and a medical imaging system.
Background
The isolation converter is used for realizing high-frequency isolation between input and output, has the advantages of high safety, small volume and the like, and can adjust the gain of the converter through the transformation ratio of the transformer, so that the isolation converter is widely applied to various power electronic equipment. When the isolation converter is controlled to perform high-frequency isolation, the output voltage is generally required to be controlled, and the current or the voltage of the resonant cavity is also expected to be controlled, so that the control performance of the isolation converter is improved, the overcurrent problem of the inverter bridge in the dynamic process is avoided, and the voltage and current double closed-loop control in the isolation converter is realized. The digital control has the advantages of high stability and good expandability, and is the first choice of the control system of the isolation converter. To realize digital control of the isolated converter, an analog-to-digital converter is an indispensable device.
However, when the existing isolation converter adopts an analog-to-digital converter to perform analog-to-digital conversion, the existing isolation converter has larger defects in performance, such as serious waveform distortion and frequency aliasing when the resonant cavity current is sampled, and further the modulated wave signal is disturbed; or a significant load on the overall system in terms of cost, which results in a very high cost of isolating the converter overall system. How to meet the digital control requirements with the lowest hardware cost becomes a great difficulty in isolating the converter at present.
Disclosure of Invention
In view of the foregoing, there is a need for an improved isolation converter, X-ray generation apparatus, and medical imaging system, which can avoid waveform distortion and frequency aliasing of the first sampling circuit during sampling on the basis of ensuring cost and overall cost performance, and has extremely high cost performance and wide application prospects.
The invention provides an isolation converter which comprises a power conversion circuit, a first sampling circuit and a second sampling circuit, wherein the power conversion circuit comprises an isolation transformer circuit and a control circuit, the input ends of the first sampling circuit and the second sampling circuit are connected with the isolation transformer circuit, and the output ends of the first sampling circuit and the second sampling circuit are connected with the control circuit; the first sampling circuit comprises a high-speed analog-to-digital converter, the second sampling circuit comprises a low-speed analog-to-digital converter, and the isolation transformer circuit is respectively connected to the control circuit through the high-speed analog-to-digital converter and the low-speed analog-to-digital converter.
Further, the isolation transformer circuit comprises an inversion unit, a resonance unit, an isolation transformer unit and a rectification unit which are connected in sequence; the input end of the high-speed analog-to-digital converter is connected with the resonance unit, and the output end of the high-speed analog-to-digital converter is connected with the control circuit; and/or the number of the groups of groups,
the input end of the low-speed analog-to-digital converter is connected with the rectifying unit, and the output end of the low-speed analog-to-digital converter is connected with the control circuit.
Further, the control circuit comprises a first modulation unit and a first comparator, wherein a first input end of the first comparator is connected with an output end of the high-speed analog-to-digital converter, a second input end of the first comparator is connected with an output end of the second sampling unit, and an output end of the first comparator is used for modulating pulse width through the first modulation unit and is connected to a sampling end of the inversion unit.
Further, the first modulation unit comprises a first regulator, a first limiter and a modulator, wherein the first regulator is used for stabilizing the output end voltage of the first comparator, the first limiter is used for limiting the output end voltage amplitude of the first comparator, the modulator is used for modulating the output end pulse width of the first comparator, and the output end of the first comparator is connected to the inversion unit sequentially through the modulator, the first limiter and the first regulator.
Further, the first sampling circuit further comprises a rectifier, and an output end of the resonance unit is connected to an input end of the high-speed analog-to-digital converter through the rectifier.
Further, the first sampling circuit further comprises a digital filter, and the output end of the high-speed analog-to-digital converter is connected to the first input end of the first comparator through the digital filter.
Further, the first sampling circuit further comprises a digital filter, and an output end of the first comparator is connected to an input end of the first modulation unit through the digital filter.
Further, the first sampling circuit further comprises a rectifier, the output end of the high-speed analog-to-digital converter is connected to the first input end of the first comparator through the rectifier, and the rectifier is a digital rectifier.
Further, the first sampling circuit further comprises a digital filter, and the digital filter is arranged between the digital rectifier and the first comparator.
Further, the control circuit further comprises a second modulation unit and a second comparator, wherein a first input end of the second comparator is connected with an output end of the low-speed analog-to-digital converter, a second input end of the second comparator is connected with a reference voltage, and an output end of the second comparator modulates pulse width through the second modulation unit and is connected to a second input end of the first comparator.
Further, the second modulation unit includes a second regulator and a second limiter, where the second regulator is configured to stabilize an output voltage of the second comparator, the second limiter is configured to limit an output voltage amplitude of the second comparator, and an output of the second comparator is connected to a second input of the first comparator through the second regulator and the second limiter that are connected in series with each other.
The invention also provides an X-ray generating device comprising an isolation transformer, wherein the isolation transformer is any one of the isolation transformers.
The invention also provides a medical imaging system comprising an X-ray generating device, which is the X-ray generating device.
According to the isolation converter provided by the invention, the high-speed analog-to-digital converter is arranged on the first sampling circuit, and the low-speed analog-to-digital converter is arranged on the second sampling circuit, so that the requirement of system control can be met with the lowest hardware cost, the hardware cost can be comprehensively considered on the premise of ensuring the control performance, and the isolation converter has a wide application prospect.
Drawings
FIG. 1 is a schematic diagram of a isolating transformer in a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a first sampling unit according to a first embodiment of the present invention;
fig. 3 is a schematic diagram of a first modulation unit according to a first embodiment of the present invention;
fig. 4 is a schematic structural diagram of a second sampling unit according to the first embodiment of the present invention;
fig. 5 is a circuit configuration diagram of a isolating transformer according to a second embodiment of the present invention;
fig. 6 is a circuit configuration diagram of a isolating transformer according to a third embodiment of the present invention;
fig. 7 is a circuit configuration diagram of a isolating transformer according to a fourth embodiment of the present invention.
Description of the main reference signs
The invention will be further described in the following detailed description in conjunction with the above-described figures.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It is noted that when an element is referred to as being "mounted on" another element, it can be directly mounted on the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or/and" as used herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, fig. 1 is a schematic diagram illustrating a isolation transformer 100 according to a first embodiment of the present invention. The present invention provides an isolated converter 100 for generating high voltage to supply a charged device with high voltage that meets operating conditions requirements.
In the present embodiment, the isolation converter 100 is a resonance type converter, and the resonance type converter can realize soft switching by its own resonance process, which is advantageous in increasing the switching frequency and the high frequency of the power equipment.
The isolation transformer 100 in the present embodiment is applied to an X-ray generating apparatus, and the isolation transformer 100 adopts a resonance type transformer and serves as a high voltage generator in the X-ray generating apparatus, which is capable of heating a cathode filament in the X-ray generating apparatus by using its high frequency switching performance and the provided high voltage transformation, and generating X-rays by using bombardment of an anode target plate in the X-ray generating apparatus by hot electrons.
It will be appreciated that in other embodiments, the isolation transformer 100 may be applied to other charging devices than the X-ray generating device described above; for example, the isolated converter 100 may be applied to a high voltage dc power supply, a high voltage power cable test, a clean energy power grid access, and the like, as long as the isolated converter 100 can be used smoothly in the current use.
The isolated converter 100 includes a power conversion circuit 10, a first sampling circuit 20, and a second sampling circuit 30, and the first sampling circuit 20 and the second sampling circuit 30 are connected to the power conversion circuit 10. The power conversion circuit 10 is used for realizing conversion boost of circuit power, and the first sampling circuit 20 and the second sampling circuit 30 are used for realizing double closed-loop control of the power conversion circuit 10.
The power conversion circuit 10 includes an isolation transformer circuit 11 and a control circuit 12, the isolation transformer circuit 11 and the control circuit 12 are connected to each other, one end of the first sampling circuit 20 and one end of the second sampling circuit 30 are connected to the isolation transformer circuit 11, and the other end is connected to the control circuit 12; the isolation transformer 11 is used to implement a step-up voltage, and the control circuit 12 is used to control and process the sampled signals transmitted by the first sampling circuit 20 and the second sampling circuit 30.
The first sampling circuit 20 and the second sampling circuit 30 collect circuit parameter signals in the isolation transformer circuit 11 and sample the circuit parameter signals into the isolation transformer circuit 11 under the control action of the control circuit 12, so that double closed-loop control of the isolation converter 100 is realized.
Specifically, the isolation transformer circuit 11 includes an inverter unit 111, a resonance unit 112, a transformation unit 113, and a rectification unit 114, the inverter unit 111, the resonance unit 112, the transformation unit 113, and the rectification unit 114 are serially connected in sequence.
The inverter unit 111 is for converting the input direct current into alternating current, the resonance unit 112 is for selecting a swimming frequency component from the input signal and suppressing unnecessary frequency components or noise, the transformation unit 113 is for changing the output voltage in the power conversion circuit 10, and the rectifying unit 114 is for rectifying the alternating current in the power conversion circuit 10 into direct current.
The voltage transformation unit 113 uses electromagnetic induction of the alternating current to originally increase the voltage of the output end thereof under the direct-alternating current conversion action of the inversion unit 111 and the frequency selection action of the resonance unit 112, and finally converts the boosted alternating current into high-voltage direct current through the rectification unit 114, thereby completing the complete boosting process of the isolation transformer circuit 11.
Specifically, regarding the structures of the inverter unit 111, the resonance unit 112, the transformation unit 113, and the rectification unit 114 themselves, the inverter unit 111, the resonance unit 112, the transformation unit 113, and the rectification unit 114 may each be of a conventional structure including the existing composition of each functional module.
The inverter unit 111 is generally capable of obtaining an alternating voltage waveform having a period associated with a preset frequency on the circuit device by alternately switching a plurality of control switches at the preset frequency. The inverter 111 may adopt full-bridge inversion, half-bridge inversion, push-change inversion, single transistor inversion, or the like.
The resonant circuit in the resonant unit 112 includes a capacitive element (not shown) and an inductive element (not shown). In operation, the resonant cells 112 are operated in which the electric field energy of the capacitive element and the magnetic field energy of the inductive element are mutually switched, which increasingly compensate each other and form a resonance. The resonance unit 112 can play a role in frequency selection and filtering in the power conversion circuit 10, and by controlling parameters of the capacitive element, the series resonance in the circuit can have a very small resistance effect on a target frequency and a very large resistance effect on other frequencies, so that a useful frequency is selected, and useless frequencies are filtered.
The transforming unit 113 generally has at least one primary coil (not shown) and at least one secondary coil (not shown); when the primary coil is energized with the ac power supplied from the resonant unit 112, an ac magnetic flux is generated in the primary coil, and the secondary coil induces a current (voltage) by the electromagnetic induction principle. The transforming unit 113 realizes a quantitative change of voltage by a turns ratio between the primary coil and the secondary coil.
The rectifying unit 114 is used for converting the alternating current boosted by the voltage transforming unit 113 into direct current. In practical use, the rectifying unit 114 may use half-wave rectification, or may use other rectifying methods other than half-wave rectification, such as full-wave rectification and bridge rectification.
The output end of the control circuit 12 is connected to the sampling end of the inversion unit 111, and the input end of the control circuit 12 is connected to the first sampling circuit 20 and the second sampling circuit 30, so that the sampling signals output by the first sampling circuit 20 and the second sampling circuit 30 are controlled and then input to the value inversion unit 111, and further the sampling control of the isolation transformer circuit 11 is realized.
The input end of the first sampling circuit 20 is connected to the output end of the resonance unit 112 in the isolation transformer circuit 11, and the output end of the first sampling circuit 20 is connected to the first input end of the control circuit 12; the input end of the second sampling circuit 30 is connected to the output end of the rectifying unit 114 in the isolation transformer circuit 11, and the output end of the second sampling circuit 30 is connected to the second input end of the control circuit 12. The first sampling circuit 20 is configured to collect the first electrical signal output by the resonance unit 112 and sample the first electrical signal to the inversion unit 111; the second sampling circuit 30 is configured to collect the second electrical signal of the rectifying unit 114 and sample the second electrical signal to the inverting unit 111 through the first sampling circuit 20.
In this embodiment, the first sampling circuit 20 is configured to perform closed-loop control on the resonant current of the resonant unit 112 of the power conversion circuit 10, that is, the first electrical signal is the resonant current of the resonant unit 112; the second sampling circuit 30 is configured to perform closed-loop control on the output voltage of the rectifying unit 114, that is, the second electrical signal is the output voltage of the rectifying unit 114; the inversion unit 111 receives the first electrical signal sampled by the first sampling circuit 20 and the second electrical signal sampled by the second sampling circuit 30, and adjusts its own electrical parameters according to the first electrical signal and the second electrical signal, thereby implementing double sampling closed-loop control on the electrical parameters of the power conversion circuit 10.
It can be understood that the present invention is not limited to the specific types of the circuit parameters of the first sampling circuit 20 and the second sampling circuit 30 to the power conversion circuit 10, that is, the present invention is not limited to the specific circuit signal types of the first electric signal and the second electric signal, and the first sampling circuit 20 not only can collect other parameters of the resonance unit 112 except the resonance current, but also can be connected to the resonance unit 112 or the transformation unit 113, so as to realize parameter control of the resonance unit 112 and the transformation unit 113; the second sampling circuit 30 not only can collect other parameters except the voltage of the rectifying unit 114, but also can be connected to the resonance unit 112 or the transformation unit 113, so that parameter control of the resonance unit 112 and the transformation unit 113 is realized; as long as the first sampling circuit 20 and the second sampling circuit 30 can perform double closed loop control of the power conversion circuit 10.
The first sampling circuit 20 includes a high-speed analog-to-digital converter 21, an input end of the high-speed analog-to-digital converter 21 is connected to a resonance unit 112 in the isolation transformer circuit 11, and an output end of the high-speed analog-to-digital converter 21 is connected to a first input end of the control circuit 12; the second sampling circuit 30 includes a low-speed analog-to-digital converter 31, an input terminal of the low-speed analog-to-digital converter 31 is connected to an output terminal of the rectifying unit 114, and an output terminal of the low-speed analog-to-digital converter 31 is connected to a second input terminal of the control circuit 12.
The first sampling circuit 20 collects the first electric signal output by the resonance unit 112, performs analog-to-digital conversion by the high-speed analog-to-digital converter 21, and then samples the first electric signal to the inversion unit 111 by the control circuit 12; the second sampling circuit 30 collects the second electric signal output by the rectifying unit 114, performs analog-to-digital conversion by the low-speed analog-to-digital converter 31, and then samples the second electric signal to the inverting unit 111 by the control circuit 12.
Because the first sampling circuit 20 adopts the high-speed analog-to-digital converter 21 with superior performance and multiple channels, the high-frequency component output by the resonance unit 112 can be subjected to analog-to-digital conversion, so that the problems of waveform distortion and frequency aliasing during the output conversion of the resonance unit 112 by adopting the low-speed analog-to-digital converter are avoided, and further, the subsequent modulation process and the normal operation of the power conversion circuit 10 are avoided. Meanwhile, since the second sampling circuit 30 adopts the low-speed analog-to-digital converter 31 with low cost, the cost can be effectively controlled, and the whole isolation converter 100 can meet the requirement of a control system with the lowest hardware cost.
Referring to fig. 2, fig. 2 is a schematic diagram illustrating a control circuit 12 according to a first embodiment of the present invention.
In one embodiment of the present invention, the control circuit 12 includes a first modulation unit 121 and a first comparator 122, wherein a first input terminal of the first comparator 122 is connected to an output terminal of the high-speed analog-to-digital converter 21, a second input terminal of the first comparator 122 is connected to an output terminal of the second sampling circuit 30, and an output terminal of the first comparator 122 is connected to a sampling terminal of the inversion unit 111 in the power conversion circuit 10 through a pulse width of the modulation circuit of the first modulation unit 121.
The first comparator 122 and the first modulation unit 121 are configured such that the first modulation unit 121 can successfully compare the digital circuit signals converted by the high-speed analog-to-digital converter 21 and the low-speed analog-to-digital converter 31, and the first modulation unit 121 is modulated and then connected to the sampling end for the sampling end of the inversion unit 111 to perform double closed loop control. Not only is easy to realize, but also the modulated circuit signal can smoothly enter the inverter unit 111.
Referring to fig. 3, fig. 3 is a schematic diagram illustrating a structure of a first modulation unit 121 according to a first embodiment of the present invention.
In one embodiment of the present invention, the first modulation unit 121 includes a first regulator 1211, a first limiter 1212, and a modulator 1213, an input terminal of the first regulator 1211 is connected to an output terminal of the first comparator 122, the first regulator 1211, the first limiter 1212, and the modulator 1213 are disposed in series with each other, and an output terminal of the modulator 1213 is connected to a sampling terminal of the inverter unit 111; the first regulator 1211 is used for stabilizing the output voltage of the first comparator 122, the first limiter 1212 is used for limiting the amplitude of the output voltage of the first comparator 122, the modulator 1213 is used for modulating the pulse width of the output of the first comparator 122, and the output of the first comparator 122 is connected to the inverter unit 111 through the first regulator 1211, the first limiter 1212 and the modulator 1213 in sequence.
The first modulating unit 121 modulates the output circuit parameters of the first comparator 122 through the first regulator 1211, the first limiter 1212 and the modulator 1213, so that the output signal of the first comparator 122 can be stably transmitted to the inverter unit 111, which has better performance advantages.
Referring to fig. 4, fig. 4 is a circuit diagram of the first sampling unit 20 and the control circuit 12 according to the first embodiment of the present invention.
Further, the first sampling circuit 20 further comprises a rectifier 22, and an output terminal in the power conversion circuit 10 is connected to an input terminal of the high-speed analog-to-digital converter 21 through the rectifier 22. The rectifier 22 can convert the first electrical signal output by the resonance unit 112 into a dc electrical signal, so that the high-speed analog-to-digital converter 21 can directly perform analog-to-digital conversion on the dc first electrical signal. This improves the output capability of the high-speed analog-to-digital converter 21, so that the reliability and stability of the entire high-voltage generator 100 are improved.
Further, the first sampling circuit 20 further comprises a digital filter 23, and an output terminal of the high-speed analog-to-digital converter 21 is connected to a first input terminal of the first comparator 122 through the digital filter 23, for filtering the received digital first electric signal, and transmitting the filtered digital first electric signal to the first comparator. The digital filter 23 is arranged so that the output signal of the high-speed analog-digital converter 21 can be subjected to closed-loop control in the form of a rectification average value after the filtering process of the digital filter 23 with large attenuation of high-frequency components and small phase loss. Therefore, the attenuation of high-frequency signals can be realized, the phase loss can be reduced and the response speed of a control loop can be improved through a flexible and changeable digital filtering mode, meanwhile, the advantages of digital control can be maintained, the hardware cost is ensured, and the method has a wide application prospect.
Further, the control circuit 12 further includes a second comparator 123 and a second modulation unit 124; the first input end of the second comparator 123 is connected to the output end of the low-speed analog-to-digital converter 31, the second input end of the second comparator 123 is connected to the reference voltage, and the output end of the second comparator 123 modulates the pulse width by the second modulating unit 124 and is connected to the second input end of the first comparator 122.
The second comparator 123 compares the reference voltage with the output voltage of the rectifying unit 114, and inputs the calculation result to the second input end of the second comparator 123 after pulse width modulation is completed by the second modulating unit 124, and the second comparator 123 is configured so that the second sampling unit 32 can complete voltage control, thereby improving control performance.
Further, the second modulating unit 124 includes a second regulator 1241 and a second limiter 1242, the second regulator 1241 is used for stabilizing the output voltage of the second comparator 123, and the second limiter 1242 is used for limiting the amplitude of the output voltage of the second comparator 123; the input end of the second regulator 1241 is connected to the output end of the second comparator 123, the input end of the second limiter 1242 is connected to the output end of the second regulator 1241, the output end of the second limiter 1242 is connected to the second input end of the first comparator 122, that is, the output end of the second comparator 123 is connected to the second input end of the first comparator 321 through the second regulator 1241 and the second limiter 1242 which are connected in series with each other.
The arrangement of the second regulator 1241 and the second limiter 1242 makes the voltage signal output by the rectifying unit 114 undergo the low-speed analog-to-digital converter for analog-to-digital conversion, and then undergo the voltage stabilization and the limiting function to participate in the signal comparison of the second comparator 123, which is more advantageous in terms of accuracy and stability.
Referring to fig. 5, fig. 5 is a circuit diagram of a isolating transformer 100 according to a second embodiment of the present invention.
The second embodiment of the present invention is different from the first embodiment in that the analog-to-digital converter 21 is told to collect the voltage signal of the resonance unit 112 through the rectifier 22 to perform the double closed loop control, that is, the first electric signal is the voltage signal. The first electric signal is set to be a voltage signal, and the collection efficiency is relatively improved.
Referring to fig. 6, fig. 6 is a circuit configuration diagram of a isolating transformer 100 according to a third embodiment of the present invention.
The third embodiment of the present invention is different from the first embodiment in that the resonance unit 112 in the third embodiment of the present invention outputs the first electric signal which directly flows into the first input terminal of the first comparator 122 after the rectification action of the rectifier 22 and the analog-digital conversion action of the high-speed analog-digital converter 21; the digital filter 23 in the first sampling circuit 20 is disposed after the output terminal of the first comparator 122, that is, the output terminal of the first comparator 122 is connected to the first regulator 1211 in the first modulation unit 121 through the digital filter 23.
After the digital filter 23 is disposed at the output end of the first comparator 122, the digital filtering link can be transferred from the sampling branch of the resonant unit 112 to the inner loop of the average value of the electrical signal of the resonant unit 112, so that the performance of digital filtering will be improved, and the reliability and stability of the whole isolation transformer 100 are improved relative to the effect of branch filtering.
Referring to fig. 7, fig. 7 is a circuit configuration diagram of a isolating transformer 100 according to a fourth embodiment of the present invention. The fourth embodiment of the present invention is different from the first embodiment in that the rectifier 22 in the fourth embodiment of the present invention is a digital rectifier, the rectifier 22 is disposed after the high-speed analog-to-digital converter 21, and the output terminal of the high-speed analog-to-digital converter 21 is connected to the first input terminal of the first comparator 122 through the rectifier 22.
The digital rectifier 22 is arranged so that the first electric signal of the resonance unit 112 can be directly sent into the high-speed analog-to-digital converter 21 for analog-to-digital conversion after being sampled, and the digital rectifier 22 carries out digital rectification processing on the sampled digital signal; the digital rectifier 22 requires relatively low hardware requirements, and the arrangement of the digital rectifier 22 further simplifies and reduces the hardware requirements of the overall system, which is beneficial to system reliability and stability.
Further, the digital filter 23 is disposed between the digital rectifier 22 and the first comparator 122 in the fourth embodiment of the present invention, and the digital filter 23 is disposed directly after the digital rectifier 22, which is beneficial to achieve efficient filtering.
According to the isolation converter 100 provided by the invention, the high-speed analog-to-digital converter 21 is arranged on the first sampling circuit 20, and the low-speed analog-to-digital converter 31 is arranged on the second sampling circuit 30, so that the requirement of system control can be met with the lowest hardware cost, the hardware cost can be comprehensively considered on the premise of ensuring the control performance, and the isolation converter has a wide application prospect.
The present invention also provides an X-ray generating device (not shown) comprising an isolating transformer 100 as described above. By adopting the isolation converter 100, the control requirement of the whole machine of the X-ray generating device is met and the hardware cost is greatly reduced.
The invention also provides a medical imaging system (not shown) comprising an X-ray generating device as described above. The medical imaging system provided by the invention has higher cost performance and stronger product competitiveness.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
It will be appreciated by persons skilled in the art that the above embodiments have been provided for the purpose of illustrating the invention and are not to be construed as limiting the invention, and that suitable modifications and variations of the above embodiments are within the scope of the invention as claimed.
Claims (13)
1. The power conversion circuit comprises an isolation transformer circuit and a control circuit, wherein the input ends of the first sampling circuit and the second sampling circuit are connected with the isolation transformer circuit, and the output ends of the first sampling circuit and the second sampling circuit are connected with the control circuit; the sampling circuit is characterized in that the first sampling circuit comprises a high-speed analog-to-digital converter, the second sampling circuit comprises a low-speed analog-to-digital converter, the isolation transformer circuit comprises an inversion unit, a resonance unit, a transformation unit and a rectification unit which are sequentially connected, the isolation transformer circuit is respectively connected to the control circuit through the high-speed analog-to-digital converter and the low-speed analog-to-digital converter, and the control circuit is used for realizing sampling control of the isolation transformer circuit.
2. The isolated converter of claim 1, wherein an input of the high-speed analog-to-digital converter is connected to the resonant unit and an output of the high-speed analog-to-digital converter is connected to the control circuit; and/or the number of the groups of groups,
the input end of the low-speed analog-to-digital converter is connected with the rectifying unit, and the output end of the low-speed analog-to-digital converter is connected with the control circuit.
3. The isolated converter of claim 2, wherein the control circuit comprises a first modulation unit and a first comparator, a first input of the first comparator being coupled to the output of the high-speed analog-to-digital converter, a second input of the first comparator being coupled to the output of the second sampling circuit, the output of the first comparator modulating pulse width via the first modulation unit and being coupled to the sampling end of the inversion unit.
4. The isolated converter of claim 3, wherein the first modulation unit comprises a first regulator, a first limiter, and a modulator, the first regulator is configured to stabilize an output voltage of the first comparator, the first limiter is configured to limit an output voltage amplitude of the first comparator, the modulator is configured to modulate an output pulse width of the first comparator, and an output of the first comparator is connected to the inverter unit sequentially through the modulator, the first limiter, and the first regulator.
5. The isolated converter of claim 2, wherein the first sampling circuit further comprises a rectifier, the output of the resonant cell being connected to the input of the high-speed analog-to-digital converter through the rectifier.
6. An isolated converter as claimed in claim 3, wherein the first sampling circuit further comprises a digital filter, the output of the high-speed analog-to-digital converter being connected to the first input of the first comparator via the digital filter.
7. An isolated converter as claimed in claim 3, wherein the first sampling circuit further comprises a digital filter, the output of the first comparator being connected to the input of the first modulation unit via the digital filter.
8. An isolated converter as claimed in claim 3, wherein the first sampling circuit further comprises a rectifier, the output of the high speed analog to digital converter being connected to the first input of the first comparator through the rectifier, and the rectifier being a digital rectifier.
9. The isolated converter of claim 8, wherein the first sampling circuit further comprises a digital filter disposed between the digital rectifier and the first comparator.
10. An isolated converter as claimed in claim 3, wherein the control circuit further comprises a second modulation unit and a second comparator, a first input of the second comparator being connected to the output of the low-speed analog-to-digital converter, a second input of the second comparator being connected to a reference voltage, an output of the second comparator being pulse width modulated by the second modulation unit and being connected to the second input of the first comparator.
11. The isolated converter of claim 10, wherein the second modulation unit comprises a second regulator and a second limiter, the second regulator configured to stabilize the output voltage of the second comparator, the second limiter configured to limit the amplitude of the output voltage of the second comparator, the output of the second comparator coupled to the second input of the first comparator via the second regulator and the second limiter in series with each other.
12. An X-ray generating device comprising an isolating transformer, characterized in that the isolating transformer is an isolating transformer as claimed in any one of claims 1 to 11.
13. A medical imaging system comprising an X-ray generating device, characterized in that the X-ray generating device is the X-ray generating device of claim 11.
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| CN115208409B (en) * | 2022-09-14 | 2023-06-06 | 芯海科技（深圳）股份有限公司 | Analog-to-digital conversion circuit, chip and electronic equipment |
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