CN108107388A - A kind of electric current combiner circuit based on electric induction coil - Google Patents
A kind of electric current combiner circuit based on electric induction coil Download PDFInfo
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- CN108107388A CN108107388A CN201711419324.9A CN201711419324A CN108107388A CN 108107388 A CN108107388 A CN 108107388A CN 201711419324 A CN201711419324 A CN 201711419324A CN 108107388 A CN108107388 A CN 108107388A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
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Abstract
The invention discloses a kind of electric current combiner circuit based on electric induction coil, including：Power isolator for input ac power to be carried out interference and insulation processing, and rectification output DC power supply, and supplies energy to electric current generation module；Main digitial controller, for exporting pulse information to the switching tube in the electric current generation module, to control the turn-on and turn-off of switching tube；Electric current generation module, the DC power supply for that will input carries out power conversion, and provides driving current and work to the gradient coil of magnetic resonance imaging device；The real-time current value of detection for detecting the real-time current value that the electric current generation module generates, and is sent to main digitial controller by primary current sense device；Main digitial controller is compared according to the real-time current value that the primary current sense device of reception detects with pre-set current value, and corresponding pulse information is exported according to the output control of comparison；Multiple H bridges that electric current generation module includes being made of multiple switch pipe form.
Description
Technical field
The present invention relates to information control field, more particularly to a kind of electric current combiner circuit based on electric induction coil.
Background technology
Illustrate by taking the gradient current generation module in NMR system (MRI) and matching gradient coil as an example：
The current waveform of feed-in gradient coil is usually required in the industry, as shown in Figure 9：Wherein, Amax=600A, precision 0.01%, d=
500uS, existing index, T=3000uS；In recent years it is the technical performance and efficiency of raising MRI, if it is desired to：It is expected index Amax
Reach more than 850A, below d=200uS；Below T=1200uS.
According to the display of above-mentioned data；Obviously, current peak improves 42%；Detection rates (frequency) improve 150%；
In order to meet existing index, current art is generally up to " H-type inverter bridge (abbreviation H bridges) " electricity of 800V using a busbar voltage
Road directly exports current waveform feed-in gradient coil shown in Fig. 8.
Main problem existing in the prior art in application process：
It is very painstaking to meet existing index, expectation index can not be met at all, let alone random waveform can be generated.
Because the IGBT of H bridges be operated in its switching frequency, voltage and current ability limiting value near.Why mistake is used
The modulation system of phase frequency multiplication, exactly because the limit switch frequency 40KHz of IGBT also much can not meet the requirement of existing index,
Frequency multiplication can only also meet the requirement of existing index to 80KHz reluctantly.
Energy conversion efficiency is very low, this is because the group IGBT in H bridges, it is necessary to using high frequency linearity IGBT and work
On the switching capability (40KHz) of the limit.And the switching characteristic of high frequency linearity IGBT itself is excessively poor, causes turning for whole device
Efficiency 50% is changed also to reach；So low transfer efficiency, it is the necessary water cooling of H bridges to bring additional trouble, therefore is caused cold
But the cost of device and operating cost are high.
The switching capability of the 40KHz of linear IGBT still can not meet the requirement of existing index, it has to using " misphase times
Frequency arrives the PWM modulation technology of 80KHz ", is exactly the pollution that inverter bridge generates substantial amounts of " common mode current " with the cost of this technology.
This electromagnetic pollution not only further reduces transfer efficiency, also brings huge pollution control cost.
Based on above, this application provides the technical solutions of solution more than technical problem.
The content of the invention
The object of the present invention is to provide a kind of electric current combiner circuit based on electric induction coil, by the way that multiple H bridges are decomposed
Parallel connection forms multiple topological structures, improves work efficiency, the cost for product of having told somebody what one's real intentions are, while plays the effect of electromagnetic energy-saving.
Technical solution provided by the invention is as follows：
A kind of electric current combiner circuit based on electric induction coil, including：Power isolator, electric current generation module, main number
Controller, primary current sense device；The power isolator, for input ac power to be carried out interference and insulation processing, and rectification
DC power supply is exported, and supplies energy to the electric current generation module；The main digitial controller, for export pulse information to
Switching tube in the electric current generation module, to control the turn-on and turn-off of the switching tube；The electric current generation module, is used for
The DC power supply of input is subjected to power conversion, and provide driving current to magnetic resonance imaging device gradient coil into
Row work；The primary current sense device, for detecting the real-time current value that the electric current generation module generates, and by the reality of detection
When current value be sent to the main digitial controller；The main digitial controller is detected according to the primary current sense device of reception
The real-time current value be compared with pre-set current value, corresponding pulse information is exported according to the output control of comparison；Institute
Multiple H bridges that stating electric current generation module includes being made of multiple switch pipe form.
Preferably, the electric current generation module includes：Multiple electric current generation submodules and 1 current compensation module；Root
The electric current generation submodule quantity is obtained according to predetermined current waveform parameter and the performance parameter of preset switches pipe；It is each described
Electric current generation submodule generates equal currents；Multiple electric current generation submodule parallel connections are connected electrically in the power isolator
On；The primary current sense device monitors multiple electric current generation submodules and the electricity of current compensation module generation in real time
Summation is flowed, and the electric current summation is sent in the main digitial controller, the main digitial controller is according to the electric current
Summation is compared with the predetermined current parameter, corresponding with electric current generation submodule quantity according to the output of the result of comparison
Equivalent pulse information and compensated pulse information, the respectively each electric current generation submodule generation of corresponding control electric current
Information and the shape information of current compensation module output, make its current information generated meet the predetermined current waveform parameter,
It works for the gradient coil.
Preferably, the electric current generation submodule includes：1 H bridge, sub-figure controller, electron current sensor；Institute
It states H bridges to be made of 4 switching tubes, the H bridges set energy input end, signal control terminal and energy output terminal；It is described
The energy input end of H bridges is connected electrically in communication power supply end by the power isolator parallel connection；The energy output of the H bridges
The positive terminal parallel connection at end is connected electrically in one end of the gradient coil；The negative pole end of the energy output terminal of the H bridges and the son
The power positive end electrical connection of current sensor；The power cathode end of the electron current sensor is in parallel to be electrically connected the gradient line
The other end of circle；The information output of electron current sensor electricity corresponding with the data control port of the sub-figure controller
Connection, public connecting end electrical connection corresponding with the data control port of the main digitial controller.
Preferably, the current compensation module；The current compensation module is set：1 described information compensates H bridges, compensation
Digitial controller, compensation current sensor；Described information compensation H bridges are made of 4 switching tubes, setting energy input end,
Signal control terminal and energy output terminal；The energy input end of described information compensation H bridges passes through power isolator electricity in parallel
It is connected to communication power supply end；The positive terminal parallel connection of the energy output terminal of described information compensation H bridges is connected electrically in the gradient
One end of coil；The positive pole of the negative pole end of the energy output terminal of described information compensation H bridges and the compensation current sensor
End electrical connection；The power cathode end other end in parallel for being electrically connected the gradient coil of the compensation current sensor；The benefit
Repay the information output electrical connection corresponding with the data control port of the compensation digitial controller of current sensor, public company
End is connect to be electrically connected with the compensation data control port of the main digitial controller.
Preferably, further included in the electric current generation submodule and the current compensation module：Step-up transformer and filtering
Device；Judge whether the rise time of the formation of electric current summation current waveform to the peaking meets the default rise time, when discontented
When sufficient, according to the parameter information of the electric current summation, default rise time and the gradient coil, the first pre- imputation is utilized
Method obtains the parameter of the step-up transformer, by the parameter of the step-up transformer after adjustment, meets the default of current waveform
Rise time；The electrode input end of the primary coil of the step-up transformer and the energy output head anode end of the H bridges are electrically connected
It connects；The negative input of the primary coil of the step-up transformer is electrically connected with the energy output head anode end of the H bridges；It is described
The cathode output end of the secondary coil of step-up transformer is electrically connected by the inductance in the wave filter with the gradient coil；Institute
State the secondary coil of step-up transformer cathode output end be electrically connected with one end of the capacitance in the wave filter after and with it is described
The power positive end electrical connection of electron current sensor or the compensation current sensor；Capacitance in the wave filter it is another
End is electrically connected with the gradient coil.
Preferably, a kind of electric current combiner circuit based on electric induction coil according to right wants 5, which is characterized in that
It further includes：The energy output head anode of the electrode input end of the primary coil of the step-up transformer and described information compensation H bridges
End electrical connection；The negative input of the primary coil of the step-up transformer and the energy output of described information compensation H bridges are rectified
Extreme electrical connection；The cathode output end of the secondary coil of the step-up transformer passes through the inductance in the wave filter and the ladder
Spend coil electrical connection；One end electricity of the cathode output end of the secondary coil of the step-up transformer and the capacitance in the wave filter
It is electrically connected after connection and with the power positive end of the electron current sensor or the compensation current sensor；The wave filter
In the other end of capacitance be electrically connected with the gradient coil.
Preferably, the electric current generation module further includes：The topological structure of multiple and different frequencies and 1 current compensation mould
Block；The topological structure of multiple and different frequencies is connected electrically in alternating current source by the corresponding power isolator parallel connection；
According to the first predetermined current waveform parameter that the electric current generation module exports, using the mathematical model of default second algorithm, obtain
Take the second predetermined current waveform parameter of multiple and different frequencies；It is built according to the second predetermined current waveform parameter of different frequency
The topological structure of vertical respective frequencies；The primary current sense device detects multiple topological structures and the electric current in real time
The electric current summation of compensating module generation, and the electric current summation is sent in the main digitial controller, the main number control
Device processed is compared according to the electric current summation with the first predetermined current waveform parameter, is exported according to the result of comparison and more
The corresponding pulse information of the topological structure and compensated pulse information of a different frequency, corresponding control is each described respectively opens up
The current information of structural generation and the shape information of current compensation module output are flutterred, meets its current information generated described pre-
If current waveform parameter works for the gradient coil.
Preferably, the topological structure of same frequency includes：Multiple electric currents generate submodule, and 1 auxiliary is digital control
Device, 1 auxiliary amperage sensor；The information output of multiple electric current generation submodules controls respectively with the auxiliary data
The digital control port of device corresponds electrical connection；The cathode output end of multiple electric current generation submodules and the auxiliary electricity
The power positive end electrical connection of flow sensor；The cathode output end of multiple electric current generation submodules is mended respectively with the electric current
Repay the power positive end electrical connection of the cathode output end and the primary current sense device of module；The electricity of the primary current sense device
Source negative pole end is electrically connected with one end of the gradient coil；The other end of the gradient coil respectively with the current compensation module
Cathode output end and the electric current generation submodule described in auxiliary amperage sensor power cathode end electrical connection；Institute
State the information output electrical connection corresponding with the data control port of the main digitial controller of primary current sense device；The electric current
The electrical connection corresponding with the data control port of the main digitial controller of the signal control terminal of compensating module；The auxiliary number control
The auxiliary data control port of device processed is electrically connected with the data control port one-to-one corresponding of the main digitial controller.
Preferably, the electric current generation submodule includes：1 H bridge, 1 sub- digitial controller, 1 electron current pass
Sensor；The H bridges are made of 4 switching tubes, and the H bridges set energy input end, signal control terminal and energy output
End；The energy input end of the H bridges is connected electrically in communication power supply end by the power isolator parallel connection；The H bridges
The positive terminal parallel connection of energy output terminal is connected electrically in the power positive end of the electron current sensor；The signal control of the H bridges
It holds and is electrically connected with the data control port of sub-figure controller one-to-one corresponding；The signal output part of the electron current sensor
Electrical connection corresponding with the digitial controller data-interface end；The power cathode end of electron current sensor electrical connection institute in parallel
State the other end of gradient coil；The data control terminal of the information output of the electron current sensor and the sub-figure controller
Mouth corresponds electrical connection, and public connecting end is electrically connected with the data control port one-to-one corresponding of the main digitial controller.
Preferably, the current compensation module includes：1 described information compensates H bridges, compensates digitial controller and compensation
Current sensor；Described information compensation H bridges are made of 4 switching tubes, set energy input end, signal control terminal and
Energy output terminal；The energy input end of described information compensation H bridges is connected electrically in Alternating Current Power Supply by the power isolator parallel connection
Power end；The positive terminal parallel connection of the energy output terminal of described information compensation H bridges is connected electrically in one end of the gradient coil；It is described
The negative pole end of the energy output terminal of information compensation H bridges is electrically connected with the power positive end of the compensation current sensor；The benefit
Repay the power cathode end other end in parallel for being electrically connected the gradient coil of current sensor；The letter of the compensation current sensor
Cease output terminal electrical connection corresponding with the data control port of the compensation digitial controller, public connecting end and the main number
The compensation data control port electrical connection of controller.
Preferably, further included in the electric current generation submodule and the current compensation module：Step-up transformer and filtering
Device；Judge whether the rise time of the formation of electric current summation current waveform to the peaking meets the default rise time, when discontented
When sufficient, according to the parameter information of the electric current summation, default rise time and the gradient coil, the first pre- imputation is utilized
Method obtains the parameter of the step-up transformer, by the parameter of the step-up transformer after adjustment, meets the default of current waveform
Rise time；The electrode input end of the primary coil of the step-up transformer and the energy output head anode end of the H bridges are electrically connected
It connects；The negative input of the primary coil of the step-up transformer is electrically connected with the energy output head anode end of the H bridges；It is described
The cathode output end of the secondary coil of step-up transformer is electrically connected by the inductance in the wave filter with the gradient coil；Institute
State the secondary coil of step-up transformer cathode output end be electrically connected with one end of the capacitance in the wave filter after and with it is described
The power positive end electrical connection of electron current sensor or the compensation current sensor；Capacitance in the wave filter it is another
End is electrically connected with the gradient coil.
Preferably, further include：The electrode input end of the primary coil of the step-up transformer and described information compensation H bridges
Energy output head anode end is electrically connected；The negative input of the primary coil of the step-up transformer compensates H bridges with described information
Energy output head anode end electrical connection；The cathode output end of the secondary coil of the step-up transformer passes through in the wave filter
Inductance be electrically connected with the gradient coil；In the cathode output end of the secondary coil of the step-up transformer and the wave filter
Capacitance one end electrical connection after and with the electron current sensor or it is described compensation current sensor power positive end be electrically connected
It connects；The other end of capacitance in the wave filter is electrically connected with the gradient coil.
A kind of electric current combiner circuit based on electric induction coil provided by the invention, can bring following at least one beneficial
Effect：
1st, in the present invention, based on inductive load, the preferred gradient coil for being applied to MRI system, it can also be
Electron accelerator in nuclear physics experiment, the pulse uulcanizer of Strength of Metallic Materials processing, the magnetic artillery in military affairs, ejector etc.
Deng, i.e., every occasion for needing to use the high intensity Lorentz force of various forms, the field of application is of low cost than wide,
Control method is flexible.
2nd, in the present invention, substitute IGBT in the prior art with metal-oxide-semiconductor, on the one hand solve in the prior art due to IGBT
Working frequency it is limiting, the switching characteristic of high frequency linearity IGBT itself is excessively poor, and the transfer efficiency of whole device is caused to be less than
50%；The problem of energy conversion efficiency is very low improves work efficiency；Second aspect, since transfer efficiency is low, power dissipation ratio
Larger, work system is easily generated heat, it is necessary to H bridge water coolings, therefore be solved the problems, such as with high costs.
3rd, in the present invention, the component selected by the application solves the switch energy of linear IGBT in the prior art
Power still can not meet the requirement of existing index, it has to using the PWM modulation technology of " misphase frequency multiplication ", therefore cause H bridges
The problem of the problem of generating substantial amounts of " common mode current ", causing very big electromagnetic pollution and Final pollution, treatment cost.
4th, in the present invention, according to the implementation of its circuit design and scheme, multiple test is carried out, electric energy can be measured
Actual transfer efficiency be up to more than 95%, therefore only need air-cooled H bridges can.This is converted compared with current art scheme imitates
Rate wants huge water-cooling system to maintain operation, also wants the common mode inhibition measure of huge costliness, economic effect is not known less than 50%
Improve many times.
5th, in the present invention, the method for this patent " decomposing H bridge and parameter preset, then Parallel opertation " is covered for product
The big and small various demands in market are also undoubtedly that Material Cost is minimum, a kind of most fast mode of development rate.
Description of the drawings
Below by a manner of clearly understandable, preferred embodiment is described with reference to the drawings, electric induction coil is based on to one kind
Above-mentioned characteristic, technical characteristic, advantage and its realization method of electric current combiner circuit be further described.
Fig. 1 is a kind of one embodiment of the electric current combiner circuit based on electric induction coil of the present invention；
Fig. 2 is a kind of another embodiment of the electric current combiner circuit based on electric induction coil of the present invention；
Fig. 3 is a kind of another embodiment of the electric current combiner circuit based on electric induction coil of the present invention；
Fig. 4 is a kind of another embodiment of the electric current combiner circuit based on electric induction coil of the present invention；
Fig. 5 is a kind of another embodiment of the electric current combiner circuit based on electric induction coil of the present invention；
Fig. 6 is a kind of another embodiment of the electric current combiner circuit based on electric induction coil of the present invention；
Fig. 7 is a kind of another embodiment of the electric current combiner circuit based on electric induction coil of the present invention；
Fig. 8 is a kind of another embodiment of the electric current combiner circuit based on electric induction coil of the present invention；
Fig. 9 is a kind of another embodiment of the electric current combiner circuit based on electric induction coil of the present invention.
Specific embodiment
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, control is illustrated below
The specific embodiment of the present invention.It should be evident that the accompanying drawings in the following description is only some embodiments of the present invention, for
For those of ordinary skill in the art, without creative efforts, other are can also be obtained according to these attached drawings
Attached drawing, and obtain other embodiments.
To make simplified form, part related to the present invention is only schematically shown in each figure, they are not represented
Its practical structures as product.In addition, so that simplified form readily appreciates, there is identical structure or function in some figures
Component only symbolically depicts one of those or has only marked one of those.Herein, "one" is not only represented
" only this " can also represent the situation of " more than one ".
A kind of electric current combiner circuit based on electric induction coil, including：Power isolator, electric current generation module, main number
Controller, primary current sense device；The power isolator, for input ac power to be carried out to the isolation of safety and electromagnetic interference
Processing, and rectification output DC power supply, and supply energy to the electric current generation module；The main digitial controller, for defeated
Go out pulse information to the switching tube in the electric current generation module, to control the turn-on and turn-off of the switching tube；The electric current
Generation module, the DC power supply for that will input carries out power conversion, and provides driving current and set to Magnetic resonance imaging
Standby gradient coil works；The primary current sense device, for detecting the real-time current that the electric current generation module generates
Value, and the real-time current value of detection is sent to the main digitial controller；The main digitial controller is according to reception
The real-time current value of primary current sense device detection is compared with pre-set current value, according to the output pair of the output control of comparison
The pulse information answered；Multiple H bridges that the electric current generation module includes being made of multiple switch pipe form.
Specifically, in the present embodiment, with reference to shown in figure 1；The electric current combiner circuit of electric induction coil is used to generate difference
Waveform, the current value of varying strength meet the requirement of load, for loading normal operation；For loading the current parameters of normal operation
Waveform usually with reference to shown in figure 5 is in this application Alternating Current Power Supply, is additionally provided with turning for AC-to DC in this application
Conversion between parallel operation, i.e. AC/DC；Passing through isolation processing device, removing the interference of electromagnetic noise, after isolation denoising
DC power supply is loaded at the both ends of electric current generation module, and energy is provided for electric current generation module；According to use environment and load
The difference of parameter, electric current generation module generate the electric current of relevant parameter, and current sensor is for detection electric current generation module in real time
The size of the current value of generation, electric current generation module are that the H bridges built by multiple switch pipe form；The break-make of H bridges is to pass through
It generates what different PWM waveforms determined in digitial controller, while electric current is further generated by the duty cycle adjustment of PWM waveform
Size.
On the basis of above example, the present invention provides another embodiments；With reference to shown in figure 2 and 5；The electric current life
Include into module：Multiple electric current generation submodules and 1 current compensation module；According to predetermined current waveform parameter and preset
The performance parameter of switching tube obtains the electric current generation submodule quantity；Each electric current generation submodule generates equivalent electricity
Stream；Multiple electric current generation submodules are connected electrically in alternating current source by the corresponding power isolator parallel connection；It is described
Primary current sense device monitors the electric current summation of multiple electric current generation submodules and current compensation module generation in real time,
And the electric current summation is sent in the main digitial controller, the main digitial controller is according to the electric current summation and institute
It states predetermined current parameter to be compared, according to the result of comparison output equivalence corresponding with electric current generation submodule quantity
The current information and electricity of pulse information and compensated pulse information, the respectively each electric current generation submodule generation of corresponding control
The shape information of compensating module output is flowed, its current information generated is made to meet the predetermined current waveform parameter, for the ladder
Degree coil works.
Specifically, in the present embodiment, when the environment that electric current combiner circuit is applied in the application is different, therefore its demand
The frequency f=1/T of current waveform is also different；The peak A of electric currentmaxAlso different namely current effective value is different, and electric current reaches peak
The rise time d of value is also different；In the case of frequency f=1/T relatively low of current waveform, while when peak value rises
Between d also than relatively low；In the present embodiment according to the working frequency and load current value of load；And work is met according to satisfaction
Make the parameter of the component of environmental demand；Load rating current value is subjected to equivalent decomposition；Also i.e. by H bridges of the prior art into
Row is equivalent to be decomposed, and resolves into the H bridges of multiple generation low currents, then by the H bridge output-parallels of multiple generation low currents, by life
Into equivalent low current and loading in primary current sense device and in loading coil；Primary current sense device is used to detect this reality
Apply the sum of low current of a medium value；When the sum of low current is unsatisfactory for the default load current value of the loaded work piece of the application
When, a current compensation module in parallel again in the H bridges of multiple equivalences of the present embodiment, for compensating and adjusting the sum of low current
It is unsatisfactory for the default load current value of loaded work piece；When embodiments herein is applied to MRI system (MR imaging apparatus
Mainly it is made of following four part:The systems groups such as magnet system, gradient magnetic system, radio frequency system, computer and image procossing
Into) in when, by taking Fig. 2 as an example, further instruction：H bridges of the prior art, equivalence decomposite N number of high-precision, in/it is small arbitrary
The H bridges of current waveform, Unit1, Unit2 ... Unitn (hereinafter referred to as U1, U2 ... Un).U1, U2 ... each Un of Un, Un+1
It can work independently, output high-precision, the trapezoidal current wave of small/middle intensity.The electrical schematic diagram topology of Un is shown in Fig. 6, by U1,
The output of U2...Un, direct " parallel connection " feed-in load (gradient coil) is so inner in load (gradient coil), can be synthetically produced
In high precision, high intensity, trapezoidal current wave.Control circuit monitors, compares the current waveform synthesized in load and requirement output in real time
Current waveform difference, inputted in real time using this difference as the reference of Un+1, corresponding output also simultaneously and U1,
U2 ... the output-parallel of Un, feed-in load (gradient coil), makes the current waveform in load (gradient coil) accord with completely together
Close the current waveform required by MRI system.
On the basis of above example, the present invention provides another embodiments；With reference to shown in figure 3；The electric current generation
Submodule includes：1 H bridge, sub-figure controller, electron current sensor；The H bridges are made of 4 switching tubes, institute
It states H bridges and energy input end, signal control terminal and energy output terminal is set；The energy input end of the H bridges passes through the power supply
Isolator parallel connection is connected electrically in communication power supply end；The positive terminal parallel connection of the energy output terminal of the H bridges is connected electrically in described
One end of gradient coil；The negative pole end of the energy output terminal of the H bridges and the power positive end of the electron current sensor are electrically connected
It connects；The power cathode end of the electron current sensor other end in parallel for being electrically connected the gradient coil；The electron current sensing
The electrical connection corresponding with the data control port of the sub-figure controller of the information output of device, public connecting end and the master
The data control port of digitial controller corresponds to electrical connection.The current compensation module is set：1 described information compensates H bridges, mends
Repay digitial controller, compensation current sensor；Described information compensation H bridges are made of 4 switching tubes, set energy input
End, signal control terminal and energy output terminal；Described information compensation H bridges energy input end by the power isolator simultaneously
Connection is connected electrically in communication power supply end；The positive terminal parallel connection of the energy output terminal of described information compensation H bridges is connected electrically in described
One end of gradient coil；The power supply of the negative pole end of the energy output terminal of described information compensation H bridges and the compensation current sensor
Positive terminal is electrically connected；The power cathode end other end in parallel for being electrically connected the gradient coil of the compensation current sensor；Institute
The information output electrical connection corresponding with the data control port of the compensation digitial controller of compensation current sensor is stated, it is public
Connecting pin is electrically connected with the compensation data control port of the main digitial controller altogether.
Specifically, in the present embodiment, since a high current H bridge is resolved into multiple low current H bridges, at this
Electric current is referred to as in application and generates submodule, in each electric current generates submodule, the H bridges all built including 1 by switching tube,
1 sub- current sensor；Electron current sensor is used to detect the current value of affiliated electric current generation submodule, and the size of electric current is led to
Cross the PWM waveform control that affiliated sub-figure controller generates；With reference to shown in figure 2；U1, U2, U3 ... Un represents the generation of each electric current
Submodule；Un+1 represents current compensation module；It is to pass through that electric current, which generates submodule and the current value of current compensation module generation,
The H bridges built inside its its by metal-oxide-semiconductor generate, positive terminal out+ all loading in one end of load, the negative pole end of current value
Out- loads the electrode input end in primary current sense device；It is digital control that the reference current of each electric current submodule comes from master
Device can know by figure, master controller output U1ref, U2ref, U3ref ... Unref is sent to each electric current output submodule
Information control terminal Ref in the block；A feedack stream is formed in each electric current generates submodule again, master is digital control
A current difference Δ I is formed by the electric current of all outputs and compared with the real-time current value of primary current sense device detection pin ends；
And current differential Δ I is compensated by information compensation electric current submodule；This compensation is generally realized by PID control；
Pass through figure；A number of words son control is further included in each electric current generates submodule, it is in the block for adjusting each mould
Current value；It can so ensure that each submodule exports equivalent, accurate current information.
On the basis of above example, the present invention provides another embodiments；Electric current generation submodule and described
It is further included in current compensation module：Step-up transformer and wave filter；Judge that the electric current summation forms current waveform to peaking
Rise time whether meet the default rise time, when being unsatisfactory for, according to the electric current summation, default rise time and institute
The parameter information of gradient coil is stated, using the first preset algorithm, the parameter of the step-up transformer is obtained, described in after adjustment
The parameter of step-up transformer meets the default rise time of current waveform；The anode of the primary coil of the step-up transformer is defeated
Enter end to be electrically connected with the energy output head anode end of the H bridges；The negative input of the primary coil of the step-up transformer with
The energy output head anode end electrical connection of the H bridges；The cathode output end of the secondary coil of the step-up transformer passes through described
Inductance in wave filter is electrically connected with the gradient coil；The cathode output end of the secondary coil of the step-up transformer with it is described
After one end electrical connection of capacitance in wave filter and with the power supply of the electron current sensor or the compensation current sensor just
Extreme electrical connection；The other end of capacitance in the wave filter is electrically connected with the gradient coil.
On the basis of above example, the present invention provides another embodiments；With reference to shown in figure 3；It further includes：The liter
The electrode input end of the primary coil of pressure transformer is electrically connected with the energy output head anode end of described information compensation H bridges；It is described
The negative input of the primary coil of step-up transformer is electrically connected with the energy output head anode end of described information compensation H bridges；Institute
The cathode output end for stating the secondary coil of step-up transformer is electrically connected by the inductance in the wave filter with the gradient coil；
After the cathode output end of the secondary coil of the step-up transformer is electrically connected with one end of the capacitance in the wave filter and with institute
State the power positive end electrical connection of electron current sensor or the compensation current sensor；Capacitance in the wave filter it is another
One end is electrically connected with the gradient coil.
Specifically, in the present embodiment, when the environment that electric current combiner circuit is applied in the application is different, therefore its demand
The frequency f=1/T of current waveform is also different；The peak A of electric currentmaxAlso different namely current effective value is different, and electric current reaches peak
The rise time d of value is also different；In the case of frequency f=1/T relatively low of current waveform, while when peak value rises
Between d also than relatively low；And step-up transformer is then for solving the problems, such as the rise time；More preferably it is suitable for frequency f higher, electricity
Stream peak value Amax is larger, and the rise time, d was shorter, i.e., in the case of faster, to add step-up transformer realize it is higher, larger, compared with
In the case of fast, according to formula U=L Δ I/ Δs t, if in the time Δ t of setting, current value also reaches setting
Peak Amax, what load parameter was not constant between, then what can uniquely be changed is then supply voltage, due to loading entire electricity
Input voltage in road is invariable, solve the problems, such as more than, can only be changed by step-up transformer；It so needs to sentence
Break under conditions of not boosting, when rising to peak point current, whether the rise time meets the requirements, if being unsatisfactory for passing through boosting
Transformer is realized；According to no-load voltage ratio formulaAcquire the booster of phase strain ratio parameter；Warp after boosting
Wave filter carries out interference filter processing, loads at the both ends of load.
On the basis of above example, the present invention provides another embodiments；It is characterized in that, the electric current generation mould
Block further includes：The topological structure of multiple and different frequencies and 1 current compensation module；The topological structure of multiple and different frequencies
Alternating current source is connected electrically in by the corresponding power isolator parallel connection；First exported according to the electric current generation module
Predetermined current waveform parameter using the mathematical model of default second algorithm, obtains the second predetermined current ripple of multiple and different frequencies
Shape parameter；Fourier space establishes the topology of respective frequencies according to the second predetermined current waveform parameter of different frequency
Structure；Current value in each topological structure is different；The primary current sense device detect in real time multiple topological structures with
And the electric current summation of the current compensation module generation, and the electric current summation is sent in the main digitial controller, institute
It states main digitial controller to be compared with the first predetermined current waveform parameter according to the electric current summation, according to the knot of comparison
Fruit exports pulse information corresponding with the topological structure of multiple and different frequencies and compensated pulse information, respectively corresponding control
The current information of each topological structure generation and the shape information of current compensation module output, the summed current for generating it
Information meets the predetermined current waveform parameter, works for the gradient coil.
It is specifically, in parallel after elaborating equivalent decomposing H bridge in the embodiment above；With reference to shown in Fig. 3 and 4；In this implementation
In example, the first predetermined current waveform parameter refers to preferable current waveform, is theoretical value；H bridges non-equivalent is decomposed；With first-class
Be worth it is obscure in can meet relatively low f, smaller Amax, the requirement of slower d；But higher f cannot be met, larger Amax, very fast d's wants
It asks；In the present embodiment, by the parameter of setting, according to Fourier expansion namely the second preset algorithm, resolve into multiple
The electric current generation submodule of frequency；Its decomposition principle is：By Fourier expansion, multiple and different frequencies can be obtained, it is different
The sinusoidal current waveform of peak value, this can not only meet high frequency requirements, but also can meet the need of low frequency in actual application process
It asks；Further improve the work efficiency of system.The peak value of each grade corresponds to corresponding frequency and reaches the rising of peak value
Time d, according further to same grade peak value, corresponding frequency and rise time establish corresponding topological structure, then often
Size in a topological structure further according to peak value carries out equivalence and resolves into multiple electric currents generation submodules, equally, primary current sense
Device detects the sum of electric current in entire combiner circuit, and the sum of electric current of generation is compared with the current parameters that pre- pin ends are set,
According to the control algolithm program in the main digitial controller of comparison result, including pid control algorithm, the real-time control of current differential is realized
System reaches and meets the needs of setting, and current differential compensating parameter needs the corresponding data control port by main digitial controller
Corresponding reference value is provided, reference value current compensation module compensates, by realizing the balance of electric current combiner circuit with this, together
When also meet the work requirements of loading coil.
On the basis of above example, the present invention provides another embodiments；The topological structure bag of same frequency
It includes：Multiple electric currents generate submodule, 1 auxiliary digitial controller, 1 auxiliary amperage sensor；Multiple electric current generation
The information output of module corresponds with the digital control port of the auxiliary data controller be electrically connected respectively；It is multiple described
The cathode output end of electric current generation submodule is electrically connected with the power positive end of the auxiliary amperage sensor；Multiple electric currents
Generate submodule cathode output end respectively with the cathode output end of the current compensation module and the primary current sense device
Power positive end electrical connection；The power cathode end of the primary current sense device is electrically connected with one end of the gradient coil；Institute
The other end for stating gradient coil is generated with the cathode output end of the current compensation module and the electric current in submodule respectively
The power cathode end electrical connection of the auxiliary amperage sensor；The information output of the primary current sense device and the main number
The data control port of controller corresponds to electrical connection；The signal control terminal of the current compensation module and the main digitial controller
Data control port correspond to electrical connection；The auxiliary data control port of the auxiliary digitial controller and the master are digital control
The data control port of device corresponds electrical connection.
Specifically, it is illustrated by specific parameter；Assuming that desired waveform is the trapezoidal wave shown in Fig. 5：Its parameter
Amax=850A；Precision 0.02%；T=1ms, i.e. f=1000Hz；D=120us；It is unfolded by Fourier space：
K is odd number；After corresponding expansion, the frequency domain parameter shown in the following table 1 is obtained：
Table 1：
| Fundamental wave peak value | 3 subharmonic peak values | 5 subharmonic peak values | 7 subharmonic peak values | 9 subharmonic peak values | 11 subharmonic peak values |
| 1012.438 | 182.018 | 0.000182828 | -33.432 | -12.503 | 8.367 |
The desired trapezoidal waves of Fig. 5, major frequency components are fundamental wave and 3 subharmonic, 5 times and 13 times or more harmonic waves it is effective
Value, peak value do not influence output accuracy, can ignore.7th, 9,11 subharmonic be can not ignore, but three and more high order
The current peak of synthesis, virtual value occupies the ratio of fundamental current, less than 5%.According to this thinking, this patent is by Fig. 1 institutes
The main current modules shown are decomposed into tri- seed current module of Ua, Ub, Uc：Referring to Fig. 4, Ua is responsible for output fundamental wave (rms=specially
The f1=1000Hz sine waves of 715.9A)；Ub is responsible for 3 subharmonic of output specially, and (f2=3000Hz of rms=128.71A is sinusoidal
Ripple)；Uc is responsible for specially exporting remaining harmonic wave.(containing 7,9,11, etc. higher hamonic wave).Ua, Ub are f1 for single-frequency output
And f2, although current strength is very high, still circuit design difficulty and cost can be greatly lowered.The output comparison of ingredients of Uc is answered
It is miscellaneous, but rms contents are less than 5%, so the difficulty of Uc designs can also substantially reduce.Since Fig. 5 it is expected that waveform can decompose
For each frequency content shown in table 1, then be responsible for the Ua of each frequency content of output, three tunnels of Ub, Uc export, based on Kiel suddenly
Husband's current law is directly in parallel, feed-in load (gradient coil), so that it may synthetically produced in (gradient coil) is loaded to meet Fig. 5 phases
Hope the current waveform of index.
1st, the expression formula of Ua output currents:Iua (t)=1012.438*sin (2* π * 1000Hz*t), peak value is
1012.438A rms=715.9A；Frequency is the sine-wave current of 1000Hz.
2nd, the expression formula of Ub output currents：Iub (t)=182.018*sin (2* π * 3000Hz*t), peak value is
182.018A, rms=128.71A；Frequency is the sine-wave current of 3000Hz.
3rd, Uc output currents, according to table 1, frequency content is mainly 7000Hz, the sine wave of 9000Hz, 11000Hz,
Strength component is very low, and Uc is considered as the output of a low current multi resonant waveform, by the digital control of gradient amplifier
Device, by default total current I1 subtract in real time Ua+Ub Ia+Ib export, difference DELTA I be exactly Uc reference input Ic namely
The output Ic of referenceC, Uc, the in real time output in parallel for adding in Ua+Ub, load (gradient coil) inner can synthesize meet Fig. 1
Desired current waveform.
Corresponding 1 auxiliary amperage sensor and 1 auxiliary number control in the topological structure of each Ua in the present embodiment
Device processed；Come with reference to electric current in the one-to-one port of autonomous digitial controller configuration；Main digitial controller will be received
Pre-set current value of the reference current as the topological structure；Then by the way that digitial controller is aided in be allocated to its each submodule
Information control terminal；The real-time current value exported in each electric current generation submodule reloads the auxiliary electricity in the topological structure
Flow sensor；The sum of the current value is sent to primary current sense device and the supplementary number of the topological structure by auxiliary amperage sensor
In word controller；It can so realize that each topological structure individually regulates and controls, and does not influence the work of other topological structures, finally sends
To principal current controller and primary current sense device, it is achieved that unified management regulation and control.
On the basis of above example, the present invention provides another embodiments；With reference to figure 3 and Fig. 4；The electric current generation
Submodule includes：1 H bridge, 1 sub- digitial controller, 1 sub- current sensor；The H bridges are by 4 switching tubes
Composition, the H bridges set energy input end, signal control terminal and energy output terminal；The energy input end of the H bridges passes through
The power isolator parallel connection is connected electrically in communication power supply end；The positive terminal parallel connection of the energy output terminal of the H bridges is electrically connected
It is connected on the power positive end of the electron current sensor；The signal control terminal of the H bridges and the data of the sub-figure controller
Control port corresponds electrical connection；The signal output part of the electron current sensor and the digitial controller data-interface end
Corresponding electrical connection；The power cathode end of the electron current sensor other end in parallel for being electrically connected the gradient coil；The son
The information output of current sensor is electrically connected with the data control port one-to-one corresponding of the sub-figure controller, public company
End is connect to be electrically connected with the data control port one-to-one corresponding of the main digitial controller.
On the basis of above example, the present invention provides another embodiments；The current compensation module includes：1
Described information compensates H bridges, compensates digitial controller and compensation current sensor；Described information compensates H bridges by 4 switches
Pipe forms, and sets energy input end, signal control terminal and energy output terminal；The energy input end of described information compensation H bridges leads to
It crosses the power isolator parallel connection and is connected electrically in communication power supply end；The anode of the energy output terminal of described information compensation H bridges
End parallel connection is connected electrically in one end of the gradient coil；The negative pole end of the energy output terminal of described information compensation H bridges and the benefit
Repay the power positive end electrical connection of current sensor；The power cathode end of the compensation current sensor is in parallel to be electrically connected the ladder
Spend the other end of coil；The data control terminal of the information output of the compensation current sensor and the compensation digitial controller
The corresponding electrical connection of mouth, public connecting end are electrically connected with the compensation data control port of the main digitial controller.
On the basis of above example, the present invention provides another embodiments；Electric current generation submodule and described
It is further included in current compensation module：Step-up transformer and wave filter；Judge that the electric current summation forms current waveform to peaking
Rise time whether meet the default rise time, when being unsatisfactory for, according to the electric current summation, default rise time and institute
The parameter information of gradient coil is stated, using the first preset algorithm, the parameter of the step-up transformer is obtained, described in after adjustment
The parameter of step-up transformer meets the default rise time of current waveform；The anode of the primary coil of the step-up transformer is defeated
Enter end to be electrically connected with the energy output head anode end of the H bridges；The negative input of the primary coil of the step-up transformer with
The energy output head anode end electrical connection of the H bridges；The cathode output end of the secondary coil of the step-up transformer passes through described
Inductance in wave filter is electrically connected with the gradient coil；The cathode output end of the secondary coil of the step-up transformer with it is described
After one end electrical connection of capacitance in wave filter and with the power supply of the electron current sensor or the compensation current sensor just
Extreme electrical connection；The other end of capacitance in the wave filter is electrically connected with the gradient coil.
On the basis of above example, the present invention provides another embodiments；It further includes：At the beginning of the step-up transformer
The electrode input end of grade coil is electrically connected with the energy output head anode end of described information compensation H bridges；The step-up transformer
The negative input of primary coil is electrically connected with the energy output head anode end of described information compensation H bridges；The step-up transformer
The cathode output end of secondary coil be electrically connected by the inductance in the wave filter with the gradient coil；The boosting transformation
It is sensed after the cathode output end of the secondary coil of device is electrically connected with one end of the capacitance in the wave filter and with the electron current
The power positive end electrical connection of device or the compensation current sensor；The other end of capacitance in the wave filter and the ladder
Spend coil electrical connection.
Specifically, with reference to figure 3 and Fig. 4；The embodiment and the equivalent connection relation of embodiment and the trend of control signal
Completely the same, which is not described herein again.It is further illustrated for the design in the topological structure of different frequency
Then above-described embodiment
Ua is designed：
Assuming that Ua peak point currents fan-out capability is required to reach more than 1000A, so, Ua must be by above-mentioned equivalent decomposition
Scheme carries out, and equivalence is decomposed into 10 H bridges Ua1, Ua2 ..., Ua10.Each Uan has 120A1000Hz sine-wave currents
Fan-out capability；Figure after Uan decomposition is with reference to 3 topological circuit of figure.Uan exports the sine-wave current of 1000Hz, the PWM frequencies of H bridges
Rate=100*1000Hz=100HKz, busbar voltage 800V, H bridge select 1200V NMosfet, and bipolar modulation is greatly kept away
Common-mode noise is exempted from.If selecting any IGBT, the PWM frequency of 100KHz may not be born at all.Step-up transformer designs, by
In gradient coil L=200uH, d=120uS, L* (dI/dT)=1400V, so must 800V Vbus be raised 2 times, arrive
1600V.Transformer N=2.
Ub is designed：It is required that Ub exports more than peak point current 185A, frequency is up to the sine wave of 3000Hz, at this moment, H bridges
PWM frequency is necessary for：100*3KHz=300KHz.This frequency is handled, NMosfet is rather painstaking, so should select
SiC Mosfet.The H bridges of SiC Mosfet compositions, the technical solution of comparative maturity is that output peak current capability is below 75A,
So Ub answers equivalence to be divided into 3 H bridges, it is respectively Ub1, Ub2, Ub3, the peak current capability of Parallel opertation reaches 195A.Ub
Decomposition method, also make based on engineering is actual, be the result of the reasonable balance of cost and performance.Ubn is also used
The electric principle topological diagram of Fig. 5.Busbar voltage 800V, H bridge the selection 1200V SiC Mosfet of Ubn, bipolar modulation, greatly
Avoid common-mode noise.Step-up transformer N=2.
Uc is designed：The frequency content of the output current of Uc is very high, and the PWM frequency of H bridges will reach at least：100*11000Hz
=1.1mHz.SiC Mosfet also reach so high frequency, it is necessary to DaN Mosfet namely gallium nitride mosfet are selected,
Bipolar modulation selects the electric principle topological diagram of Fig. 5.400V busbar voltages boost to 1600V, transformer voltage ratio N=4.Uan、
The electric principle topology of Ubn, Uc participate in Fig. 3,
Each embodiment is provided based on the present invention, is designed and is calculated following technique effect：With reference to figure 6 and figure
7；In the present invention, circuit topology and design method, in inductive load, by the actual means of practicable engineering, than
It is more economical reasonably to obtain desired current waveform.
In the present invention, based on inductive load, the preferred gradient coil for being applied to MRI system, it can also be core
Electron accelerator in physical test, the pulse uulcanizer of metal material intensive treatment, the magnetic artillery in military affairs, ejector etc.
Deng, i.e., every occasion for needing to use the high intensity Lorentz force of various forms, the field of application is of low cost than wide,
Control method is flexible.
In the present invention, substitute IGBT in the prior art with metal-oxide-semiconductor, on the one hand solve in the prior art due to IGBT works
Working frequency it is limiting, the switching characteristic of high frequency linearity IGBT itself is excessively poor, and the transfer efficiency of whole device is caused to be less than
50%；The problem of energy conversion efficiency is very low improves work efficiency；Second aspect, since transfer efficiency is low, power dissipation ratio
Larger, work system is easily generated heat, it is necessary to H bridge water coolings, therefore be solved the problems, such as with high costs.
In the present invention, the component selected by the application solves the switching capability of linear IGBT in the prior art
Still it can not meet the requirement of existing index, it has to using the PWM modulation technology of " misphase frequency multiplication ", therefore cause the production of H bridges
The problem of the problem of giving birth to substantial amounts of " common mode current ", causing very big electromagnetic pollution and Final pollution, treatment cost.
It is compared by Fig. 7 and Fig. 8；The output current curve of first half expression is " fundamental wave+3 times+7 times " synthesis
Current waveform can be used in the occasion of " emphasizing quickly, not very to emphasize precision ", can also so reduce cost, obtain faster
Speed it is expected that waveform accelerates 10% than Fig. 8；Fig. 7 lower half curve is that the output current of 100% execution Fig. 4 technical solutions is bent
Line.It can be seen that no matter output current accuracy and speed, all meet the desired current waveforms of Fig. 1 and compared with Fig. 1 expectation curves,
Trapezoidal top, the corner arc transition at bottom.Any influence is not brought in practical applications.
In the present invention, according to the implementation of its circuit design and scheme, multiple test is carried out, electric energy can be measured
Actual transfer efficiency is up to 95%, thus only need it is air-cooled can.This is compared with current art scheme transfer efficiency deficiency
50%, huge water-cooling system to maintain operation, also wants the common mode inhibition measure of huge costliness, economic effect does not know to improve
Many times.
In addition, this patent described Uan, Ubn, Un, Uc etc., can be applied individually to any output low current (peak value electricity
Flow below 120A) occasion or the 2-9 occasion applied to medium current in parallel.It is this in application, boosting transformation in Fig. 3
Device can even not have to, after reasonably selecting busbar voltage Vbus, H bridges can directly filtered device output current, advantageously reduce
Cost.
In the present invention, the method for this patent " decomposing H bridge and expectation electric current waveform, expectation electric current value, then Parallel opertation ",
It is also undoubtedly that Material Cost is minimum for the big and small various demands in product covering market, a kind of most fast side of development rate
Formula.
In the present invention, if being realized in the form of SFU software functional unit and being independent production marketing or use
When, it can be stored in a computer read/write memory medium.Based on such understanding, the technical solution of the application is substantially
In other words the part to the contribution of the prior art or the technical solution in whole or in part can be in the form of software product
It embodies, which is stored in a storage medium, is used including some instructions so that a computer
Equipment (but personal computer, server either network equipment) or processor perform the application embodiment the method
All or part of step.And foregoing storage value bag data server, cloud server, read-only memory (ROM, Read-
Only Memory), random access memory (RAM, Random Access Memory), mobile communication equipment or CD,
Or USB flash disk etc. is various can be with the medium of store code.
It should be noted that above-described embodiment can be freely combined as needed.The above is only the preferred of the present invention
Embodiment, it is noted that for those skilled in the art, do not departing from the premise of the principle of the invention
Under, several improvements and modifications can also be made, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (12)
1. a kind of electric current combiner circuit based on electric induction coil, which is characterized in that including：Power isolator, electric current generation mould
Block, main digitial controller, primary current sense device；
The power isolator for input ac power to be carried out interference and insulation processing, and rectification output DC power supply, and carries
The electric current generation module is given for energy；
The main digitial controller, for exporting pulse information to the switching tube in the electric current generation module, with described in control
The turn-on and turn-off of switching tube；
The electric current generation module, the DC power supply for that will input carries out power conversion, and provides driving current to core
The gradient coil of MR imaging apparatus works；
The primary current sense device, for detecting the real-time current value that the electric current generation module generates, and by the real-time of detection
Current value is sent to the main digitial controller；
The real-time current value and predetermined current that the main digitial controller is detected according to the primary current sense device of reception
Value is compared, and corresponding pulse information is exported according to the output control of comparison；
Multiple H bridges that the electric current generation module includes being made of multiple switch pipe form.
A kind of 2. electric current combiner circuit based on electric induction coil according to right wants 1, which is characterized in that the electric current life
Include into module：Multiple electric current generation submodules and 1 current compensation module；
The electric current generation submodule quantity is obtained according to predetermined current waveform parameter and the performance parameter of preset switches pipe；Often
A electric current generation submodule generates equal currents；Multiple electric current generation submodules pass through the corresponding isolated from power
Device parallel connection is connected electrically in alternating current source；
The primary current sense device monitors multiple electric currents generation submodules and current compensation module generation in real time
Electric current summation, and the electric current summation is sent in the main digitial controller, the main digitial controller is according to the electricity
Stream summation is compared with the predetermined current parameter, and submodule quantity pair is generated with the electric current according to the output of the result of comparison
The electricity of the equivalent pulse information and compensated pulse information answered, the respectively each electric current generation submodule generation of corresponding control
Stream information and the shape information of current compensation module output make its current information generated meet the predetermined current waveform ginseng
Number, works for the gradient coil.
A kind of 3. electric current combiner circuit based on electric induction coil according to right wants 2, which is characterized in that the electric current life
Include into submodule：1 H bridge, sub-figure controller, electron current sensor；
The H bridges are made of 4 switching tubes, and the H bridges set energy input end, signal control terminal and energy output
End；
The energy input end of the H bridges is connected electrically in communication power supply end by the power isolator parallel connection；
The positive terminal parallel connection of the energy output terminal of the H bridges is connected electrically in one end of the gradient coil；
The negative pole end of the energy output terminal of the H bridges is electrically connected with the power positive end of the electron current sensor；
The power cathode end of the electron current sensor other end in parallel for being electrically connected the gradient coil；
The electrical connection corresponding with the data control port of the sub-figure controller of the information output of the electron current sensor,
Public connecting end electrical connection corresponding with the data control port of the main digitial controller.
4. a kind of electric current combiner circuit based on electric induction coil according to right wants 2, which is characterized in that the electric current is mended
Repay module；
The current compensation module is set：1 described information compensates H bridges, compensation digitial controller, compensation current sensor；
Described information compensation H bridges are made of 4 switching tubes, set energy input end, signal control terminal and energy output
End；
The energy input end of described information compensation H bridges is connected electrically in communication power supply end by the power isolator parallel connection；
The positive terminal parallel connection of the energy output terminal of described information compensation H bridges is connected electrically in one end of the gradient coil；
The negative pole end of the energy output terminal of described information compensation H bridges and the power positive end of the compensation current sensor are electrically connected
It connects；
The power cathode end other end in parallel for being electrically connected the gradient coil of the compensation current sensor；
The information output of the compensation current sensor is corresponding with the data control port of the compensation digitial controller to be electrically connected
It connects, public connecting end is electrically connected with the compensation data control port of the main digitial controller.
5. a kind of any electric current combiner circuits based on electric induction coil of 2-4 are wanted according to right, which is characterized in that described
Electric current generates to be further included in submodule and the current compensation module：Step-up transformer and wave filter；
Judge whether the rise time of the formation of electric current summation current waveform to the peaking meets the default rise time, when discontented
When sufficient, according to the parameter information of the electric current summation, default rise time and the gradient coil, the first pre- imputation is utilized
Method obtains the parameter of the step-up transformer, by the parameter of the step-up transformer after adjustment, meets the default of current waveform
Rise time；
The electrode input end of the primary coil of the step-up transformer is electrically connected with the energy output head anode end of the H bridges；
The negative input of the primary coil of the step-up transformer is electrically connected with the energy output head anode end of the H bridges；
The cathode output end of the secondary coil of the step-up transformer passes through the inductance in the wave filter and the gradient coil
Electrical connection；
The cathode output end of the secondary coil of the step-up transformer be electrically connected with one end of the capacitance in the wave filter after simultaneously
It is electrically connected with the power positive end of the electron current sensor or the compensation current sensor；
The other end of capacitance in the wave filter is electrically connected with the gradient coil.
6. a kind of electric current combiner circuit based on electric induction coil according to right wants 5, which is characterized in that further include：
The energy output head anode end electricity of the electrode input end of the primary coil of the step-up transformer and described information compensation H bridges
Connection；
The energy output head anode end electricity of the negative input of the primary coil of the step-up transformer and described information compensation H bridges
Connection；
The cathode output end of the secondary coil of the step-up transformer passes through the inductance in the wave filter and the gradient coil
Electrical connection；
The cathode output end of the secondary coil of the step-up transformer be electrically connected with one end of the capacitance in the wave filter after simultaneously
It is electrically connected with the power positive end of the electron current sensor or the compensation current sensor；
The other end of capacitance in the wave filter is electrically connected with the gradient coil.
A kind of 7. electric current combiner circuit based on electric induction coil according to right wants 1, which is characterized in that the electric current life
It is further included into module：The topological structure of multiple and different frequencies and 1 current compensation module；
The topological structure of multiple and different frequencies is connected electrically in alternating current source by the corresponding power isolator parallel connection；
According to the first predetermined current waveform parameter that the electric current generation module exports, the mathematical modulo of default second algorithm is utilized
Type obtains the second predetermined current waveform parameter of multiple and different frequencies；
The topological structure of respective frequencies is established according to the second predetermined current waveform parameter of different frequency；
The primary current sense device detects multiple topological structures in real time and the electric current of current compensation module generation is total
With, and the electric current summation is sent in the main digitial controller, the main digitial controller is according to the electric current summation
It is compared with the first predetermined current waveform parameter, according to the output of the result of comparison and the topology of multiple and different frequencies
The current information of the corresponding pulse information of structure and compensated pulse information, the respectively each topological structure generation of corresponding control
With the shape information of current compensation module output, its current information generated is made to meet the predetermined current waveform parameter, for institute
Gradient coil is stated to work.
8. a kind of electric current combiner circuit based on electric induction coil according to right wants 7, which is characterized in that same frequency
The topological structure includes：Multiple electric currents generate submodule, 1 auxiliary digitial controller, 1 auxiliary amperage sensor；
The information output of the multiple electric currents generation submodules digital control port with the auxiliary data controller respectively
Correspond electrical connection；
The cathode output end of multiple electric current generation submodules is electrically connected with the power positive end of the auxiliary amperage sensor；
The cathode output end of multiple electric currents generation submodules respectively with the cathode output end of the current compensation module and
The power positive end electrical connection of the primary current sense device；
The power cathode end of the primary current sense device is electrically connected with one end of the gradient coil；
The other end of the gradient coil is sub with the cathode output end of the current compensation module and electric current generation respectively
The power cathode end electrical connection of auxiliary amperage sensor described in module；
The electrical connection corresponding with the data control port of the main digitial controller of the information output of the primary current sense device；
The electrical connection corresponding with the data control port of the main digitial controller of the signal control terminal of the current compensation module；
The auxiliary data control port of the auxiliary digitial controller and the data control port of the main digitial controller are one by one
Corresponding electrical connection.
A kind of 9. electric current combiner circuit based on electric induction coil according to right wants 8, which is characterized in that the electric current life
Include into submodule：1 H bridge, 1 sub- digitial controller, 1 sub- current sensor；
The H bridges are made of 4 switching tubes, and the H bridges set energy input end, signal control terminal and energy output
End；
The energy input end of the H bridges is connected electrically in communication power supply end by the power isolator parallel connection；
The positive terminal parallel connection of the energy output terminal of the H bridges is connected electrically in the power positive end of the electron current sensor；
The signal control terminal of the H bridges is electrically connected with the data control port one-to-one corresponding of the sub-figure controller；
The electrical connection corresponding with the digitial controller data-interface end of the signal output part of the electron current sensor；
The power cathode end of the electron current sensor other end in parallel for being electrically connected the gradient coil；
The information output of the electron current sensor and the data control port one-to-one corresponding of the sub-figure controller are electrically connected
It connects, public connecting end is electrically connected with the data control port one-to-one corresponding of the main digitial controller.
A kind of 10. electric current combiner circuit based on electric induction coil according to right wants 7, which is characterized in that the electric current
Compensating module includes：1 described information compensates H bridges, compensates digitial controller and compensation current sensor；
Described information compensation H bridges are made of 4 switching tubes, set energy input end, signal control terminal and energy output
End；
The energy input end of described information compensation H bridges is connected electrically in communication power supply end by the power isolator parallel connection；
The positive terminal parallel connection of the energy output terminal of described information compensation H bridges is connected electrically in one end of the gradient coil；
The negative pole end of the energy output terminal of described information compensation H bridges and the power positive end of the compensation current sensor are electrically connected
It connects；
The power cathode end other end in parallel for being electrically connected the gradient coil of the compensation current sensor；
The information output of the compensation current sensor is corresponding with the data control port of the compensation digitial controller to be electrically connected
It connects, public connecting end is electrically connected with the compensation data control port of the main digitial controller.
11. a kind of any electric current combiner circuits based on electric induction coil of 7-10 are wanted according to right, which is characterized in that institute
It states and is further included in electric current generation submodule and the current compensation module：Step-up transformer and wave filter；
Judge whether the rise time of the formation of electric current summation current waveform to the peaking meets the default rise time, when discontented
When sufficient, according to the parameter information of the electric current summation, default rise time and the gradient coil, the first pre- imputation is utilized
Method obtains the parameter of the step-up transformer, by the parameter of the step-up transformer after adjustment, meets the default of current waveform
Rise time；
The electrode input end of the primary coil of the step-up transformer is electrically connected with the energy output head anode end of the H bridges；
The negative input of the primary coil of the step-up transformer is electrically connected with the energy output head anode end of the H bridges；
The cathode output end of the secondary coil of the step-up transformer passes through the inductance in the wave filter and the gradient coil
Electrical connection；
The cathode output end of the secondary coil of the step-up transformer be electrically connected with one end of the capacitance in the wave filter after simultaneously
It is electrically connected with the power positive end of the electron current sensor or the compensation current sensor；
The other end of capacitance in the wave filter is electrically connected with the gradient coil.
12. a kind of electric current combiner circuit based on electric induction coil according to right wants 11, which is characterized in that further include：
The energy output head anode end electricity of the electrode input end of the primary coil of the step-up transformer and described information compensation H bridges
Connection；
The energy output head anode end electricity of the negative input of the primary coil of the step-up transformer and described information compensation H bridges
Connection；
The cathode output end of the secondary coil of the step-up transformer passes through the inductance in the wave filter and the gradient coil
Electrical connection；
The cathode output end of the secondary coil of the step-up transformer be electrically connected with one end of the capacitance in the wave filter after simultaneously
It is electrically connected with the power positive end of the electron current sensor or the compensation current sensor；
The other end of capacitance in the wave filter is electrically connected with the gradient coil.
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| CN108107388B (en) | 2020-07-24 |
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