CN202840971U - Scanning power supply for generating exciting current - Google Patents
Scanning power supply for generating exciting current Download PDFInfo
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- CN202840971U CN202840971U CN 201220374691 CN201220374691U CN202840971U CN 202840971 U CN202840971 U CN 202840971U CN 201220374691 CN201220374691 CN 201220374691 CN 201220374691 U CN201220374691 U CN 201220374691U CN 202840971 U CN202840971 U CN 202840971U
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Abstract
The utility model relates to the field of the heavy ion tumour therapeutic equipment technology, especially to a power supply for generating a scanning current for excitation. The provided power supply comprises a power converter and a power supply controller. Besides, the power supply is characterized in that the front end of the power converter is connected with a three-phase alternating current power supply and the rear end of the power converter is connected with a load; the power converter is multi-stage one that forms a series connection and parallel connection structure; and the single-stage power converter is formed by a rectifier and a full bridge switch converter. Being connected with the power converter, the power supply controller is formed by a PI regulator and a pulse generation and phase shift module and is used for realizing adjustment and control of the power supply, generating a pulse width modulation signal and carrying out phase dislocation distribution according to the series connection stage. According to the utility model, the continuous scanning requirement and the spot scanning requirement can be met; the amplitude, the frequency, the precision and the error of the wave form of the scanning current needed by scanning magnet can be realized to generate the needed scanning magnetic field.
Description
Technical field
The utility model relates to the Heavy Ion Cancer Therapy equipment technical field, especially relates to a kind of for generation of the power supply of excitation with sweep current.
Background technology
Heavy-ion cancer therapy is a kind of method that latest development is got up in the radiotherapy, thereby its operation principle is to utilize the high-energy heavy ion bundle that tumour is shone the kill tumor cell.When heavy ion beam current is distributed to the treatment terminal after acceleration is finished, it generally all is very thin a branch of (being called again the pen bundle).Tumor focus still always can accurately be described tumor shape with 3 d space coordinate generally without solid shape.The Z direction is defined as the tumour degree of depth generally speaking, and X and Y-direction are defined as length of tumor and width.In order to improve therapeutic efficiency, reduce side effect, the Shu Jinhang conversion that delivery system need to be brought is about to line and controls and conversion according to the size of three directions of XYZ of illuminated tumour, and to adapt to the shape of tumour, this process is called again suitable shape.Wherein depth direction is that the control of Z direction is determined by beam energy.Directions X and Y-direction control realize that by scanning system directions X scanning magnet and Y-direction scanning magnet form the system of having scanned with its field power supply.Scanning magnet and its exciting current are by examining the scanning power supply power supply in the scanning system.
Two kinds of scan modes are generally arranged in the Heavy Ion Cancer Therapy, and a kind of is drive sweep, is called again continuous sweep; Another is active scan, is called again spot scan.So-called drive sweep is exactly ion beam current under the control on directions X and the Y-direction, in the continuous magnetic field of specific waveforms, characteristic frequency and specific amplitude, form continuous, a uniform line plane in length and Width, simultaneously with after Z direction beam energy combines, so that the distribution shape of line in the space becomes consistent with the shape of illuminated tumour, line only can be to tumour generation effect like this, and to the normal cell outside the tumour with organize and do not impact.Active scan is the same with drive sweep on depth direction, but fully different on length and Width, ion beam is under the control in a series of step pulses magnetic field, form a line plane that is formed by series of points in length and Width, enough intensive such as fruit dot, the line plane that then forms is also enough even.The difference of two kinds of scannings can with cut out a disk at a blank sheet of paper and compare, drive sweep is just as taking scissors directly to cut a disk on paper, active scan when eye is enough close, also can obtain the disk sheet just as taking a pin to prick out one by one eye along a circle.No matter be drive sweep or active scan, all need magnetic field to control the motion of line, scanning power supply is exactly the electric power system that produces exciting current.
Scanning power supply or similar device are widely used in the irradiation field, comprise the fields such as material irradiation, biological irradiation, medical irradiation.Medical treatment irradiation mainly contains proton irradiation therapeutic system, electron radiation therapeutic system etc.In actual scientific research and commercial Application, all need a branch of ray or uniform ion to be distributed on the plane by scanning means, better bring into play the effect of irradiation, perhaps be convenient to operation etc.Therefore scanning power supply is also in extensive use and the irradiation industry.Irradiation scanning power supply at present commonly used, be mainly used in the electron beam application, general one direction scanning or the twocouese of adopting scans, used waveform mainly is triangular wave, sawtooth waveforms, sine wave etc., electron mass is little, therefore scanning power supply electric current and power are all less, and often are applied to the drive sweep mode.In the oncotherapy field of radiation therapy, electron beam, proton beam all are ions commonly used, all have matured product be applied to clinical in.Be just to begin in recent years a kind of new radiation therapy method that grows up with the heavy particle therapy of carbon Shu Wei representative, at present domestic also do not have a hospital to carry out business-like clinical practice.Compare carbon, electronics and protonatomic mass and all want light many, the energy after it accelerates is also much smaller.Therefore the scanning power supply sweep current, the power that are applied to Heavy Ion Cancer Therapy all want large 10-100 doubly.Heavy particle therapy generally has active scan and two kinds of working methods of drive sweep in addition, and two kinds of scan modes are fully different, and also fully different to the requirement of scanning power supply, existing way generally is that two kinds of power supplys are realized respectively.In sum, existing scanning power supply for generation of exciting current exists that power is little, the power supply output waveform is few, and function is incomplete, and active scan and drive sweep mode of operation can not integratedly realize, the defective such as error is larger.
Summary of the invention
The purpose of this utility model is to solve that power is little in the prior art, the power supply output waveform is few, the defectives such as function is incomplete, a kind of scanning power supply for generation of exciting current is provided, its power supply master topology has adopted a plurality of full-bridge type power inverter series and parallel connections topological structures, can effectively solve the defective that exists in the prior art.
For achieving the above object, the utility model is taked following technical scheme, described a kind of scanning power supply for generation of exciting current, comprise power inverter and power-supply controller of electric, its characteristics are: described power inverter front end links to each other with three-phase alternating-current supply, the power inverter rear end links to each other with load, power inverter is multistage, multistage power inverter forms the series and parallel connections structure, single stage power converter is comprised of rectifier and full-bridge switch converter, the power inverter major function is to control and conversion from the energy work rate of electrical network, is sent to load according to the needed mode of load; Described power-supply controller of electric links to each other with power inverter, and power-supply controller of electric is comprised of pi regulator and pulse generation and phase shift block, and its effect is the regulation and control of realizing power supply, and the production burst bandwidth modulation signals also carries out misphase according to series connection progression and distributes.
The full-bridge switch converter of described power inverter is comprised of four switching tubes, and each switching tube all works on off state with pulse width modulation mode; The rectifier of described power inverter comprises rectifier transformer, rectifier bridge and low frequency LC filter, mainly is that the full-bridge switch converter for rear class provides required direct voltage.
The switching tube of described full-bridge switch converter is high-power insulated gate field-effect transistor (IGBT), works in pulse width modulation, and namely operating frequency is fixed, and pulse duration is variable, comes regulation output voltage by changing pulse duration; The full-bridge switch converter is connected in series behind the filter that output forms by one group of inductance capacitance, then links to each other with load.
The pi regulator of described power-supply controller of electric is the proportional integral circuit take integrated circuit as core, function is that PI obtains current error signal to given comparing with feedback signal, error signal is being amplified and the adjusted signal of integration, conditioning signal is sent to pulse generation and phase shift block for generation of pulse-width signal.
The in-phase input end input signal is the given signal of waveform in the described pi regulator, and given waveform is that amplitude is not more than ± the continuous ripple of 10V, and power supply will be followed given signal output current; Pi regulator inverting input input signal is load current signal, and the pi regulator output regulation signal is Δ vt, directly sends in pulse generation and the phase shift block; Pulse generation and phase shift block are comprised of two comparators, major function is that the regulating error signal that pi regulator is sent here is transformed to pulse-width signal, namely produce the signal of a fixed frequency, the pulse width modulator input signal is pi regulator thing overshoot signal delta vt processed, sends into simultaneously the in-phase input end of comparator A and the inverting input of comparator B.Described given waveform is triangular wave, sawtooth waveforms, sine wave or trapezoidal wave.
The beneficial effects of the utility model are: described a kind of scanning power supply for generation of exciting current, its power supply master topology adopts a plurality of full-bridge type power inverters (being designated hereinafter simply as the H bridge) series connection, cascaded H bridge adopts mutual phasing to drive simultaneously, and adoption rate-integration (PI) is regulated control strategy.Can realize the continuous sweep needs, also can satisfy the spot scan needs, can realize amplitude, frequency, precision, the error of the required scan current waveform of scanning magnet, produce required scanning magnetic field.The utility model also has following characteristics: the first, and power is large.The electric power outputting current peak value can reach ± 800A, and output voltage can reach ± 2000V.The second, the power supply output waveform is many.The current waveforms such as the triangular wave of the exportable Symmetrical of power supply, sinusoidal remaining output string ripple, sawtooth waveforms, trapezoidal wave also can be exported the current waveforms such as triangular wave, sine and cosine ripple, sawtooth trapezoidal wave of non-Symmetrical, can switch continuously between each waveform.The 3rd, perfect in shape and function.Each waveform can be regulated continuously to current amplitude, frequency, electric current adjustable range 0-± 800A, frequency-tuning range 0-200Hz.The 4th, active scan and the integrated realization of drive sweep mode of operation.Drive sweep and active scan are two kinds of diverse working methods, and the active scan output current wave is continuous, consequently form the line plane, will get well the main Seeking Truth linearity of power supply, and uniformity will be got well.The active scan current waveform is a series of square wave, to the requirement of power supply be rise and fall along wanting steep, the flat-top error is little.
Description of drawings
Below in conjunction with the drawings and specific embodiments, the utility model is further described.
Fig. 1 is whole theory diagram of the present utility model;
Fig. 2 is single-stage converter principle and the multistage H bridge series connection principle among the utility model Fig. 1;
Fig. 3 is the power-supply controller of electric schematic diagram among the utility model Fig. 1;
Fig. 4 is the multichannel misphase square-wave signal schematic diagram among the utility model Fig. 1
Embodiment
Below in conjunction with accompanying drawing principle of the present utility model and feature are described, institute gives an actual example and only is used for explaining the utility model, is not be used to limiting scope of the present utility model.
As shown in Figure 1, described a kind of scanning power supply for generation of exciting current, comprise power inverter and power-supply controller of electric, its characteristics are: described power inverter front end links to each other with three-phase alternating-current supply, the power inverter rear end links to each other with load, power inverter is multistage, multistage power inverter forms the series and parallel connections structure, single stage power converter is comprised of rectifier and full-bridge switch converter, the power inverter major function is to control and conversion from the energy work rate of electrical network, is sent to load according to the needed mode of load; Described power-supply controller of electric links to each other with power inverter, and power-supply controller of electric is comprised of pi regulator and pulse generation and phase shift block, and its effect is the regulation and control of realizing power supply, and the production burst bandwidth modulation signals also carries out misphase according to series connection progression and distributes.
The full-bridge switch converter of described power inverter is comprised of four switching tubes as shown in Figure 2, and each switching tube all works on off state with pulse width modulation mode; The rectifier of described power inverter comprises rectifier transformer, rectifier bridge and low frequency LC filter, mainly is that the full-bridge switch converter for rear class provides required direct voltage.The switching tube of described full-bridge switch converter is high-power insulated gate field-effect transistor (IGBT), works in pulse width modulation, and namely operating frequency is fixed, and pulse duration is variable, comes regulation output voltage by changing pulse duration; The full-bridge switch converter is connected in series behind the filter that output forms by one group of inductance capacitance, then links to each other with load.
The pi regulator of described power-supply controller of electric is the proportional integral circuit take integrated circuit as core, as shown in Figure 3, function is that PI obtains current error signal to given comparing with feedback signal, error signal is being amplified and the adjusted signal of integration, conditioning signal is sent to pulse generation and phase shift block for generation of pulse-width signal.
In-phase input end in the pi regulator (being denoted as+) input signal is the given signal of waveform, and given waveform can be that amplitude is not more than ± the continuous triangular wave of 10V, sawtooth waveforms, sine wave, trapezoidal wave etc., and power supply will be followed given signal output current.Pi regulator inverting input (being denoted as-) input signal is load current signal.The pi regulator output regulation signal is Δ vt, directly sends in pulse generation and the phase shift block.Pulse generation and phase shift block are comprised of two comparators, major function is that the regulating error signal that pi regulator is sent here is transformed to pulse-width signal, namely produce the square-wave signal of a fixed frequency (being 10KHz in this example), but the pulse duration of square wave is directly proportional with regulating error signal delta vt, and duty ratio (pulse duration with cycle ratio) can change continuously from 0-100%.The groundwork principle as shown in Figure 3.Pulse generation and phase shift block input signal are pi regulator thing overshoot signal delta vt processed, send into simultaneously the in-phase input end of comparator A and the inverting input of comparator B.The end of oppisite phase of triangular wave 1 access comparator A, that amplitude is ± modulated triangular wave of fixing (this example is 10KHz) of the frequency of 5V, the in-phase end of triangular wave 2 access comparator B, its Frequency and Amplitude and triangular wave A are just the same, and just phase place and triangular wave A just in time differ 180 °.The output pulse of comparator A is that switching tube V1, V4(see accompanying drawing 2) drive signal, the output pulse of comparator B is that switching tube V2, V3(see accompanying drawing 2) the driving signal.
Multichannel misphase square-wave signal schematic diagram is seen accompanying drawing 4, this partial circuit major function is quantity, switching tube operating frequency, the phase condition according to the series connection of H bridge, determine each road phase shift signal phase shift angle, produce the pulse-width signal of each switching tube in every one-level, phase shift angle θ=π/N, N is series connection progression, during realizing, N generally elects even number as, and in conjunction with power inverter progression selection principle, the progression of connecting generally speaking is chosen as secondary, level Four, six grades.Described phase-shift theory as an example of the secondary phase shift example in the accompanying drawing 4, other multistage phase shifts and two-stage phase-shift theory are in full accord.Take the first order as example, during definition full-bridge converter output forward current, V11, V14 position switch pipe are worked simultaneously, and V12, V13 position switch pipe end fully simultaneously, do not work, and V11, V14 are called the work of H bridge forward to pipe; During definition full-bridge converter output negative current, V12, V13 position switch plumber do, and V11, V14 position switch pipe end fully simultaneously, do not work, and V12, V13 are called the work of first order H bridge negative sense to pipe.Other are by that analogy at different levels, do such as VN1, VN4 position switch plumber, VN2, when VN3 position switch pipe ends fully, mean N conversion bridge and export forward current.Under the prerequisite that the switching tube switching frequency keeps fixing, equivalent switching frequency is 2 times of switching tube operating frequencies when two-stage series connection, if in like manner in N level tandem, by phase shift between reaching, equivalent switching frequency will be N times of switching tube operating frequency.Improved electric pressure by the series connection of H bridge so on the one hand, increased power output, in addition by the inter-stage phase shift, the equivalent switching frequency in the load that is multiplied, this kind method particularly is fit to use and occasion high-power, high response speed, for example in the high-power scanning power supply.
In order to bear high voltage, power inverter has adopted the plural serial stage structure, and series-connected stage is several to be determined according to output voltage, and every one-level is born voltage and is advisable to be no more than 300V under normal circumstances, bear like this voltage and be directly proportional with the progression of connecting, it is higher that series connection bear voltage more.But complexity in circuits also sharply increases, and generally speaking, series connection progression is no more than six grades.Every one-level power inverter principle and structure are identical, see accompanying drawing 2 for details.
Described a kind of scanning power supply for generation of exciting current, its circuit topological structure as shown in Figure 1, the high-power scanning power supply that comprises the series connection of level Four H bridge is together in series four independent H bridge outputs by busbar, the progression of series connection depends on frequency, amplitude and used load parameter.The triangular wave that needs electric power outputting current ± 800A in this example, frequency are that 0-200Hz is adjustable, and this moment, supply voltage need to be 1200V.Select accordingly four H bridge series connection, each H bridge output voltage 350V, output current 800A, PWM can adopt the i.e. 45 ° of phase shifts in π/4, each switching tube can be selected in parallel realization of IGBT module of 3 400A/1200V in the H bridge, the switching tube operating frequency is chosen as typical 10KHz, and this moment, the respective load equivalent frequency was that 40KHz power supply specific works mode is as follows:
After power supply closes a floodgate, rectification circuit work, LC filtering energy storage, after combined floodgate was finished, power supply was normal.Do the given pi regulator of sending into of reference power supply with small-signal triangular wave (take triangular wave as example) and do computing, obtain the regulating error signal and be sent to pwm unit, in this part, error signal modulated obtain fixing with frequency, the pulse signal of pulse width variations, and in pulsqe distributor, obtain the required driving signal of power switch pipe in each H bridge, this driving signal is sent into the switching tube of every correspondence after amplifying through driver, the variation of output current is controlled in the work of control switch pipe then.In whole process, power supply is exported all the time tracing preset signal.
The above only is preferred embodiment of the present utility model, and is in order to limit the utility model, not all within spirit of the present utility model and principle, any modification of doing, is equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (6)
1. scanning power supply for generation of exciting current, comprise power inverter and power-supply controller of electric, it is characterized in that: described power inverter front end links to each other with three-phase alternating-current supply, the power inverter rear end links to each other with load, power inverter is multistage, multistage power inverter forms the series and parallel connections structure, single stage power converter is comprised of rectifier and full-bridge switch converter, power inverter is used for control and conversion from the energy work rate of electrical network are sent to load according to the needed mode of load; Described power-supply controller of electric links to each other with power inverter, and power-supply controller of electric is comprised of pi regulator and pulse generation and phase shift block, is used for realizing the regulation and control of power supply, and the production burst bandwidth modulation signals also carries out misphase according to series connection progression and distributes.
2. a kind of scanning power supply for generation of exciting current according to claim 1, it is characterized in that: the full-bridge switch converter of described power inverter is comprised of four switching tubes, and each switching tube all works on off state with pulse width modulation mode; The rectifier of described power inverter comprises rectifier transformer, rectifier bridge and low frequency LC filter, for the full-bridge switch converter of rear class provides required direct voltage.
3. a kind of scanning power supply for generation of exciting current according to claim 1 and 2, it is characterized in that: the switching tube of described full-bridge switch converter is the high-power insulated gate field-effect transistor, work in pulse width modulation, be that operating frequency is fixed, pulse duration is variable, comes regulation output voltage by changing pulse duration; The full-bridge switch converter is connected in series behind the filter that output forms by one group of inductance capacitance, then links to each other with load.
4. a kind of scanning power supply for generation of exciting current according to claim 1, it is characterized in that: the pi regulator of described power-supply controller of electric is the proportional integral circuit take integrated circuit as core, function is that PI obtains current error signal to given comparing with feedback signal, error signal is being amplified and the adjusted signal of integration, conditioning signal is sent to pulse generation and phase shift block for generation of pulse-width signal.
5. a kind of scanning power supply for generation of exciting current according to claim 4, it is characterized in that: the in-phase input end input signal is the given signal of waveform in the described pi regulator, given waveform is that amplitude is not more than ± the continuous ripple of 10V, and power supply will be followed given signal output current; Pi regulator inverting input input signal is load current signal, and the pi regulator output regulation signal is Δ vt, directly sends in pulse generation and the phase shift block; Pulse generation and phase shift block are comprised of two comparators, major function is that the regulating error signal that pi regulator is sent here is transformed to pulse-width signal, namely produce the signal of a fixed frequency, the pulse width modulator input signal is pi regulator thing overshoot signal delta vt processed, sends into simultaneously the in-phase input end of comparator A and the inverting input of comparator B.
6. a kind of scanning power supply for generation of exciting current according to claim 5, it is characterized in that: described given waveform is triangular wave, sawtooth waveforms, sine wave or trapezoidal wave.
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| CN 201220374691 CN202840971U (en) | 2012-07-28 | 2012-07-28 | Scanning power supply for generating exciting current |
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| CN 201220374691 CN202840971U (en) | 2012-07-28 | 2012-07-28 | Scanning power supply for generating exciting current |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102761270A (en) * | 2012-07-28 | 2012-10-31 | 中国科学院近代物理研究所 | Scanning power supply for generating exciting current |
| US10004805B2 (en) | 2014-09-17 | 2018-06-26 | James Chinan Chen | Proton induced boron capture therapy |
-
2012
- 2012-07-28 CN CN 201220374691 patent/CN202840971U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102761270A (en) * | 2012-07-28 | 2012-10-31 | 中国科学院近代物理研究所 | Scanning power supply for generating exciting current |
| US10004805B2 (en) | 2014-09-17 | 2018-06-26 | James Chinan Chen | Proton induced boron capture therapy |
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