CN210518110U - Multi-level correction magnet power supply based on Buck circuit cascade connection - Google Patents
Multi-level correction magnet power supply based on Buck circuit cascade connection Download PDFInfo
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- CN210518110U CN210518110U CN201921360466.7U CN201921360466U CN210518110U CN 210518110 U CN210518110 U CN 210518110U CN 201921360466 U CN201921360466 U CN 201921360466U CN 210518110 U CN210518110 U CN 210518110U
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Abstract
The utility model provides a many levels correct magnet power based on Buck circuit cascades, include: the power conversion unit comprises a switching power supply module, a Buck circuit module and an H bridge which are connected in sequence and is used for converting the voltage of an external power grid into a direct-current voltage signal; the filter circuit unit is connected with the power conversion unit and is used for filtering high-frequency ripples existing in the direct-current voltage signal output by the power conversion unit and then inputting the high-frequency ripples into a load; and one end of the digital controller is connected with the filter circuit unit and used for sampling the direct-current voltage signal, and the other end of the digital controller is connected with the power conversion unit and used for generating a PWM signal to drive the Buck circuit module so as to adjust the direct-current voltage signal in real time.
Description
Technical Field
The utility model relates to a power technical field especially relates to a many levels correct magnet power based on Buck circuit cascades.
Background
In the electron storage ring, a correction magnet power supply is an important component for correcting the beam position in real time. The rapid response speed and the high stability are required at the same time, so that the rapid response speed and the high stability bring challenges to scientific researchers. The H-bridge can be used for rapidly recovering load power because the power of the H-bridge can flow in two directions, and is widely applied to a correction magnet power supply. In order to ensure the quick response, a higher voltage needs to be loaded on the direct current side, so that the output ripple is increased, and the stability of the system is further influenced; on the contrary, to ensure the stability of the system, it is necessary to add filter parameters, which affects the fast response of the power supply.
At present, a multi-level strategy is a good method for solving response speed and stability, a cascaded H-bridge circuit is adopted, and system response speed and stability are considered through switching working modes under different states of the circuit, but in the mode, the complexity of a power supply is greatly increased through the cascade connection of a plurality of groups of H-bridge circuits, and the number of used switching devices is more. In addition, the switching frequency is improved by adopting a wide-bandgap device, the filter parameters are reduced, and the response speed and stability of the system can also be improved, but the mode depends on the characteristics of the device.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
Based on the problem, the utility model provides a many level correction magnet power based on Buck circuit cascades to alleviate among the prior art and cascade through multiunit H bridge circuit and make the complexity greatly increased of power, the figure of the switching device of use is also more, and has technical problem such as dependence to wide forbidden band device characteristic.
(II) technical scheme
The utility model provides a many levels correct magnet power based on Buck circuit cascades, include:
the power conversion unit comprises a switching power supply module, a Buck circuit module and an H bridge which are connected in sequence and is used for converting the voltage of an external power grid into a direct-current voltage signal;
the filter circuit unit is connected with the power conversion unit and is used for filtering high-frequency ripples existing in the direct-current voltage signal output by the power conversion unit and then inputting the high-frequency ripples into a load; and
and one end of the digital controller is connected with the filter circuit unit and used for sampling the direct current voltage signal, and the other end of the digital controller is connected with the power conversion unit and used for generating a PWM signal to drive the Buck circuit module so as to adjust the direct current voltage signal in real time.
In the embodiment of the present invention, the switching power supply module includes N switching power supplies, and N is greater than or equal to 2.
The embodiment of the utility model provides an in, Buck circuit module includes a N Buck circuit, and this N Buck circuit is established ties each other to independent connection uses respectively a N switching power supply.
In the embodiment of the present invention, the output after the N Buck circuits are connected in series to each other is connected to the H bridge.
In an embodiment of the present invention, the H-bridge comprises a plurality of switching devices; the switching devices are used for switching the current direction according to the load requirement and do not need to work in a high-frequency switching state.
In the embodiment of the present invention, the digital controller includes an FPGA core control chip, a current sampling chip, and a current sensor.
In the embodiment of the utility model provides an in, N series connection the Buck circuit adopts the mode that the carrier wave shifted the phase to modulate.
In the embodiment of the present invention, when modulation is performed, the phases of the drive signals of the switching devices in the N Buck circuits are shifted by (360 °/N) °, respectively.
In an embodiment of the present invention, the switching device in the power conversion module is a silicon carbide MOSFET.
In an embodiment of the present invention, the sampling is closed-loop sampling.
(III) advantageous effects
According to the above technical scheme, the utility model discloses many level correction magnet power based on Buck circuit cascades has one of them or one of them part of following beneficial effect at least:
(1) the purpose of multi-level of the circuit is realized under the condition of only increasing a small number of switching tubes;
(2) the requirements of rapidity and stability of the correction magnet power supply are effectively considered.
Drawings
Fig. 1 is a schematic diagram of the composition of a multi-level calibration magnet power supply based on Buck circuit cascade according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a circuit configuration of a multi-level calibration magnet power supply based on Buck circuit cascade according to an embodiment of the present invention;
fig. 3 is a modulation schematic diagram of the carrier phase shift of the multi-level calibration magnet power supply based on the Buck circuit cascade according to the embodiment of the present invention;
fig. 4 is a measured output current step response waveform of a Buck circuit cascade-based multi-level calibration magnet power supply of an embodiment of the present invention;
FIG. 5 is a measured step response waveform for a conventional H-bridge output current;
fig. 6 shows measured output current ripples of a Buck circuit cascade-based multi-level correction magnet power supply according to an embodiment of the present invention;
fig. 7 shows the measured ripple of the output current of a conventional H-bridge.
Detailed Description
The utility model provides a many levels correct magnet power based on Buck circuit cascades, its current situation that quick response speed and low current ripple can not satisfy simultaneously to the quick correction magnet power that exists of current, based on the many levels topology that the Buck circuit cascades, use a plurality of Buck circuit cascades and realize many levels, the effectual requirement of having taken into account correction magnet power rapidity and stability.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings.
The embodiment of the utility model provides an in, provide a many level correction magnet power based on Buck circuit cascades, combine fig. 1 and fig. 2 to show, many level correction magnet power based on Buck circuit cascades includes:
the power conversion unit comprises a switching power supply module, a Buck circuit module and an H bridge which are connected in sequence and is used for converting the voltage of an external power grid into a direct-current voltage signal;
the filter circuit unit is connected with the power conversion unit and is used for filtering high-frequency ripples existing in the direct-current voltage signal output by the power conversion unit and then inputting the high-frequency ripples into a load; and
and one end of the digital controller is connected with the filter circuit unit and used for sampling the direct current voltage signal, and the other end of the digital controller is connected with the power conversion unit and used for generating a PWM signal to drive the Buck circuit module so as to adjust the direct current voltage signal in real time.
The switching power supply module comprises 3 switching power supplies of 12V;
the Buck circuit module comprises 3 Buck circuits, and the 3 Buck circuits are mutually connected in series and are respectively and independently connected with the 3 12V switching power supplies;
it should be noted that the number of the switching power supply modules, the voltage values, and the number of the Buck circuits are only used to illustrate the present embodiment, and are not limited to the present invention, and any person skilled in the art can not depart from the technical idea of the present invention to adjust the adaptability.
The number of the H bridges is set to be 1, and the H bridges comprise 4 switching devices;
the output of the 3 Buck circuits after being connected in series is connected to the H bridge, 4 switching devices of the H bridge do not need to work in a high-frequency switching state, and the function is to switch the direction of output current according to the load requirement;
all the switching devices in the power conversion module use silicon carbide MOSFETs, so that the efficiency is improved and the temperature rise is reduced under the condition of ensuring the switching frequency.
The dc voltage signal after LC filtering can be directly provided to the load.
The filter circuit unit is composed of a conventional LC filter;
the digital controller is used for controlling sampling of output current and voltage, carrying out closed-loop PI operation on current, outputting PWM (Pulse width modulation) wave to drive a switching device in the Buck circuit and realizing local and/or remote control of the multi-level correction magnet power supply based on Buck circuit cascade connection.
The digital controller comprises a current sampling chip and a current sensor; the current sampling chip adopts AD 7634; the current sensor employs IT60S manufactured by LEM corporation.
Digital controller is the indispensable part in the correction magnet power, the utility model provides a digital controller uses FPGA as core control chip.
In the embodiment of the present invention, as shown in fig. 3, for improving the equivalent switching frequency of the magnet power supply, the quick response of the dc voltage signal is improved simultaneously, the front-stage multiple paths are connected in series the Buck circuit adopts the mode of phase shift of the carrier wave to form the modulation wave for modulation, and the phase of the switching tube (switching device) driving signal in the three-path Buck circuit shifts 120 ° respectively.
In the embodiment of the present invention, as shown in fig. 4, the inductive load of the calibration magnet power supply collocation 1mH sets the switching frequency to 100kHz, the filter inductance is 8 muh, and the filter capacitance is 1.6 muf. Fig. 4 shows the output current versus bridge output voltage waveforms for a step response from 0 to 5A, with a current rise time of about 300 mus, from which it can be seen that the bridge output voltage varies in different stages during the current rise. At the initial stage of power rising, as the initial value of the PI regulator is 0, the duty ratio of the Buck circuit starts from 0, the output voltage of the bridge circuit is lower at the moment, the output has only one level, when the output of the PI regulator is increased, the duty ratio is increased, the waveform of direct-current superposed pulse voltage appears on the output voltage of the bridge circuit, and the current rapidly climbs at the stage; after the current reaches the target value, the circuit enters a steady state stage, and the output voltage pulse is converted into a pulse output state from the state of the direct current superposed pulse again. In the process, the output voltage is seamlessly switched among a plurality of levels, and the fast and stable output of the output current is realized.
In the present invention, fig. 5 shows a step response waveform of the output current of the H-bridge circuit, and the current rise time is about 1 ms. The bridge output voltage during the current ramp-up shown in fig. 5, it can be seen that since there is only one level, when the H-bridge saturation output is reached, the voltage is clipped to the dc output voltage of the H-bridge, going back to steady state and out of saturation. Comparing fig. 4 and fig. 5, it can be seen that since the Buck circuit cascade topology has multiple levels, different levels can be output at different stages, and compared with the conventional H-bridge topology, the dynamic response is faster.
Fig. 6 and 7 reflect a comparison between the Buck circuit cascade topology and the H-bridge output current ripple, and when 100kHZ switching frequency is adopted, the waveform shown in fig. 6 is 300kHZ when 3 Buck circuit cascade topologies are applied, and fig. 7 shows that the output current ripple of the conventional H-bridge topology is 100 kHZ. As can be seen from a comparison of fig. 6 and fig. 7, the H-bridge has a ripple of about 100kHZ, 10mV, and the output current ripple of the Buck circuit cascade topology is greatly reduced, and the glitch of the waveform diagram shown in fig. 7 is the measurement interference caused by the switching tube (switching device).
From the above-mentioned contrast, compare in traditional H bridge circuit, the utility model provides a technical scheme has effectually taken into account the requirement of correction magnet power rapidity and stability.
The embodiment of the present invention provides a multi-level calibration magnet power supply based on Buck circuit cascade and a testing method, wherein a specific example is applied to explain the principle and the implementation of the present invention, and the explanation of the above embodiment is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.
So far, the embodiments of the present invention have been described in detail with reference to the accompanying drawings. It is to be noted that, in the attached drawings or in the description, the implementation modes not shown or described are all the modes known by the ordinary skilled person in the field of technology, and are not described in detail. Further, the above definitions of the various elements and methods are not limited to the various specific structures, shapes or arrangements of parts mentioned in the examples, which may be easily modified or substituted by those of ordinary skill in the art.
From the above description, those skilled in the art should clearly recognize that the present invention is based on a Buck circuit cascade connection multi-level correction magnet power supply.
To sum up, the utility model provides a many levels based on Buck circuit cascades rectifies magnet power, its current situation that quick response speed and low-current ripple that exists to current fast correction magnet power can not satisfy simultaneously, based on the many levels topology that Buck circuit cascades, uses a plurality of Buck circuit cascades and realizes many levels, has effectually taken into account the requirement of correcting magnet power rapidity and stability.
It should also be noted that directional terms, such as "upper", "lower", "front", "rear", "left", "right", etc., used in the embodiments are only directions referring to the drawings, and are not intended to limit the protection scope of the present invention. Throughout the drawings, like elements are represented by like or similar reference numerals. Conventional structures or constructions will be omitted when they may obscure the understanding of the present invention.
And the shapes and sizes of the respective components in the drawings do not reflect actual sizes and proportions, but merely illustrate the contents of the embodiments of the present invention. Furthermore, in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.
Unless otherwise indicated, the numerical parameters set forth in the specification and attached claims are approximations that can vary depending upon the desired properties sought to be obtained by the present invention. In particular, all numbers expressing quantities of ingredients, reaction conditions, and so forth used in the specification and claims are to be understood as being modified in all instances by the term "about". Generally, the expression is meant to encompass variations of ± 10% in some embodiments, 5% in some embodiments, 1% in some embodiments, 0.5% in some embodiments by the specified amount.
Furthermore, the word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.
The use of ordinal numbers such as "first," "second," "third," etc., in the specification and claims to modify a corresponding element does not by itself connote any ordinal number of the element or any ordering of one element from another or the order of manufacture, and the use of the ordinal numbers is only used to distinguish one element having a certain name from another element having a same name.
In addition, unless steps are specifically described or must occur in sequence, the order of the steps is not limited to that listed above and may be changed or rearranged as desired by the desired design. The embodiments described above may be mixed and matched with each other or with other embodiments based on design and reliability considerations, i.e., technical features in different embodiments may be freely combined to form further embodiments.
Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Also in the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the invention and aiding in the understanding of one or more of the various disclosed aspects. However, the disclosed method should not be interpreted as reflecting an intention that: rather, the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, disclosed aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A cascaded multi-level correction magnet power supply based on a Buck circuit, comprising:
the power conversion unit comprises a switching power supply module, a Buck circuit module and an H bridge which are connected in sequence and is used for converting the voltage of an external power grid into a direct-current voltage signal;
the filter circuit unit is connected with the power conversion unit and is used for filtering high-frequency ripples existing in the direct-current voltage signal output by the power conversion unit and then inputting the high-frequency ripples into a load; and
and one end of the digital controller is connected with the filter circuit unit and used for sampling the direct current voltage signal, and the other end of the digital controller is connected with the power conversion unit and used for generating a PWM signal to drive the Buck circuit module so as to adjust the direct current voltage signal in real time.
2. The Buck circuit cascade-based multi-level correction magnet power supply according to claim 1, wherein the switching power supply module comprises N switching power supplies, wherein N is greater than or equal to 2.
3. The Buck circuit cascade-based multi-level corrective magnet power supply of claim 1, wherein the Buck circuit block comprises N Buck circuits connected in series and each independently connected to use the N switching power supplies.
4. The Buck circuit cascade-based multi-level corrective magnet power supply of claim 3, wherein outputs of the N Buck circuits connected in series are connected to the H-bridge.
5. The Buck circuit cascade-based multi-level corrective magnet power supply of claim 1, wherein the H-bridge comprises a plurality of switching devices; the switching devices are used for switching the current direction according to the load requirement and do not need to work in a high-frequency switching state.
6. The Buck circuit cascade-based multi-level corrective magnet power supply of claim 1, wherein the digital controller comprises an FPGA core control chip, a current sampling chip, and a current sensor.
7. The Buck circuit cascade-based multi-level corrective magnet power supply of claim 3, wherein N of said Buck circuits in series are modulated by carrier phase shifting.
8. The Buck circuit cascade-based multi-level corrective magnet power supply of claim 7, wherein the phases of the drive signals of the switching devices in the N Buck circuits are shifted by (360 °/N) °, respectively, when modulated.
9. The Buck circuit cascade-based multi-level corrective magnet power supply of claim 1, wherein the switching devices in the power conversion cells are silicon carbide MOSFETs.
10. The Buck circuit cascade-based multi-level corrective magnet power supply of claim 1, wherein the sampling is closed-loop sampling.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921360466.7U CN210518110U (en) | 2019-08-20 | 2019-08-20 | Multi-level correction magnet power supply based on Buck circuit cascade connection |
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| CN201921360466.7U CN210518110U (en) | 2019-08-20 | 2019-08-20 | Multi-level correction magnet power supply based on Buck circuit cascade connection |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110460235A (en) * | 2019-08-20 | 2019-11-15 | 中国科学技术大学 | More level correction magnet power supplies based on Buck circuits cascading |
| CN114244158A (en) * | 2021-12-20 | 2022-03-25 | 中国科学技术大学 | Linear magnet power based on H bridge |
-
2019
- 2019-08-20 CN CN201921360466.7U patent/CN210518110U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110460235A (en) * | 2019-08-20 | 2019-11-15 | 中国科学技术大学 | More level correction magnet power supplies based on Buck circuits cascading |
| CN114244158A (en) * | 2021-12-20 | 2022-03-25 | 中国科学技术大学 | Linear magnet power based on H bridge |
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