CN103560483A - Excitation power supply for superconducting magnet, and operation method thereof - Google Patents
Excitation power supply for superconducting magnet, and operation method thereof Download PDFInfo
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- CN103560483A CN103560483A CN201310429751.0A CN201310429751A CN103560483A CN 103560483 A CN103560483 A CN 103560483A CN 201310429751 A CN201310429751 A CN 201310429751A CN 103560483 A CN103560483 A CN 103560483A
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Abstract
An excitation power source 101 comprises: a power source 1; a power unit 3; a protection circuit 16 which brings the power source into a protected condition by closing a contact point 4a for short-circuit between output ends of the power unit 3 in the case that the abnormality of a superconducting magnet 2 is detected erroneously; and a first shunt resistance 5 for detecting a current value in a loop A. The excitation power source 101 further comprises a recovery circuit 31. In the case where the protection circuit 16 has activated a protection relay 4 to close the contact point 4a, the recovery circuit 31 brings the value of an output current of the power unit 3, and the value of current flowing through a superconducting coil 2L into agreement with each other by use of detection values at the first shunt resistance 5 and a second shunt resistance 8, and then opens the contact point 4a to recover the power source from the protected condition.
Description
The application is that application number is the dividing an application of application for a patent for invention of " 201010536637.4 ".The applying date of the patent of invention that application number is " 201010536637.4 " is on November 04th, 2010, and denomination of invention is " field power supply that superconducting magnet is used and method of operation thereof ".
Technical field
The present invention relates to field power supply and method of operation thereof that superconducting magnet is used.
Background technology
In superconducting magnet, there is so-called quench phenomenon, that is: because superconducting state is suffered to destroy, zero resistance becomes the phenomenon that normal conducting state produces voltage, in addition, owing to because there is producing high-tension phenomenon in the superconducting magnet that has a resistance cataclysm thereby form at the superconducting coil by larger in electric current.In addition, otherwise, if because the problem of field power supply itself causes that electric current sharply changes, influence each other with generation of above-mentioned quench etc.In field power supply side, power component may damage because of high voltage or the huge energy generation adverse current that has lost place to go, and on superconducting magnetic side, because quench occurs in electric current cataclysm, so this superconducting magnet may be damaged.
Therefore, the either party in field power supply and superconducting magnet being detected occurs when abnormal, and cutting off interrelated (connection) is appropriate operation.But, when huge electric current passes through, cut off (blocking) interrelated (connection) more dangerous.Here, in the technology described in patent documentation 1, for example, proposed circuit breaker to configure side by side the scheme of capacitor.
Patent documentation 1: Japan's Patent Application Publication communique " Unexamined Patent 7-177648 communique "
Summary of the invention
But, block the such guard method in contact of switching on and be unsuitable for large Current Control.In the guard method of large Current Control, conventionally, thereby employing makes output two terminal shortcircuits of field power supply substantially disconnect the method for this field power supply and superconducting coil.
Here, make to have defect in the method for output two terminal shortcircuits of field power supply.For example, if in fact superconducting coil does not have quench because flase drop carries out short circuit (misoperation), will cause the combination of small resistor (R) and superconducting coil (L), the release of storage power needs the long period, thereby cause exporting two ends, in long-time, all cannot remove short-circuit condition
In addition, abnormal (problem) occurring as field power supply side, existence is crossed heat anomaly because of overheated the caused what is called of power component.Sequence controller just in use or microcomputer just stop electric current output when detecting main power voltage rapid drawdown using it as internal abnormality, if but now made output two terminal shortcircuits of field power supply, in LR interdischarge interval, could remove the short-circuit condition of output equally for a long time.In addition; even if suppose to use UPS to solve voltage collapse problem; but; due to its BACKUP TIME and can backup scope being restricted, that is, for example; only can keep 10 minutes; only can retentive control system and can not back up power system, therefore, still exist and need to make output two terminal shortcircuits of field power supply protect magnet and be difficult to involution to the problem of normal condition sometime.
In addition, for example, when the blown fuse of field power supply inside, as long as change the fusing problem that its fuse just can solve fuse.But, as mentioned above, make not exist the superconducting magnet of quench to need the long period by guard mode involution to normal condition.
On the other hand, from the viewpoint that prevents that field power supply and superconducting magnet from damaging, improving is comparatively desirable selection to the detection level of the abnormalities such as quench.In addition,, from the viewpoint of avoiding sequence controller or microcomputer to carry out misoperation, comparatively desirable selection is the detection sensitivity improving voltage collapse.But, if improve the detection level to abnormality, will cause increasing the occurrence frequency (trade-off problem) of misoperation.
The present invention completes in view of the above problems, field power supply and method of operation thereof that its object is to provide a kind of like this superconducting magnet to use, even that is: due to quench, internal abnormality, the abnormalities such as main power voltage rapid drawdown have been carried out error detection and have been caused the output two ends of field power supply to be short-circuited, or, for example when the fuse of main power source power failure or replacing field power supply inside, occurred abnormal and need to process unusual condition, by taking to restore electricity or changing the measures such as fuse and in the situation of involution normal condition, field power supply and method of operation thereof that promptly involution is afterwards used to the superconducting magnet of normal condition (non-short-circuit condition).
To achieve these goals, the invention provides the field power supply that a kind of superconducting magnet of carrying out excitation to possessing the superconducting magnet of superconducting coil is used, it is characterized in that, comprising: power supply; Power cell, is connected with described power supply; Protective device, measures described power supply, described power cell or described superconducting magnet when flase drop and occurs when abnormal, closure make described power cell output two terminal shortcircuits contact and be set as guard mode; And the 1st current detector, be arranged in the loop that possesses described superconducting coil and described contact, for detection of the current value in this loop, wherein, described power cell has: amplifier; The 2nd current detector, detects the output current value of described power cell; And current control device; control described output current value; the field power supply that described superconducting magnet is used also comprises re-setting device; behind the closed described contact by described protective device; described re-setting device utilizes the detected value of described the 1st current detector and described the 2nd current detector; according to predetermined sweep speed, improve described output current value, make described output current value consistent with the current value passing through in described superconducting coil, thereby disconnect afterwards described contact by described guard mode involution.
According to said structure, utilize the detected value of above-mentioned the 1st current detector and the 2nd current detector to make the output current value of power cell consistent with the current value passing through in superconducting coil after break contact, can prevent from thus disconnecting in contact after-current generation cataclysm.Therefore, can prevent the quench of superconducting coil.; according to the present invention; even due to output two terminal shortcircuits that abnormality carried out to error detection and make field power supply, thus also can be by promptly involution of break contact after making the output current value of power cell consistent with the current value passing through in superconducting coil to normal condition (non-short-circuit condition).
In addition, according to the present invention, promptly involution is to normal condition (non-short-circuit condition), therefore, even if cause increasing the occurrence frequency of misoperation and misoperation occur because improving the detection level that the abnormalities such as quench are sent out, involution to normal condition also not need the too many time.; even if improved, to the detection level of the abnormalities such as quench, can not cause obstacle (wanting involution to normal condition not need the too many time) yet; by improving, to the detection level of abnormality, can make contact move more delicately; therefore, compare to prior art and can prevent better the destruction to field power supply or superconducting magnet.
In addition, for example, when main power source has a power failure or when the inner fuse of field power supply changes, occurred extremely need to process unusual condition, by taking to restore electricity or changing the measures such as fuse and in the situation of involution normal condition, promptly involution is afterwards to normal condition (non-short-circuit condition).
In addition, in the description of " making the output current value of power cell consistent with the current value passing through in superconducting coil, afterwards break contact ", so-called " unanimously " do not refer in full accord, and refers to roughly consistent.That is between the current value, passing through, can there is a little difference in the output current value of power cell and superconducting coil.As long as make the output current value of the power cell degree that make it possible to prevent the current value generation cataclysm contact disconnect after in superconducting coil passed through and can prevent this superconducting coil generation quench consistent with the current value passing through in superconducting coil.In addition, main power source refers to, supplies with the power supply of electric power (power supply) to the power supply of excitation power supply, is the power supply of field power supply upstream side.
In addition, in the present invention, described re-setting device can be configured to: when involution button is pressed, read in the detected value of described the 1st current detector as desired value, and using the detected value of described the 2nd current detector as currency, according to predetermined sweep speed, make two detected values consistent, disconnect afterwards described contact.
According to said structure, according to predetermined sweep speed, make two detected values consistent, thus, and by guard mode involution during to normal condition, the infringement that can suppress to bring to power cell.
And; the present invention can be configured to: described the 1st current detector is arranged on the position that can detect described output current value in described loop; described current control device utilizes the detected value of described the 1st current detector to control described output current value in normal condition; when by guard mode involution; utilize the detected value of described the 2nd current detector to control described output current value; thus, when this normal condition and this involution, the current detector of controlling for output current is switched.
The output current that compares to normal condition is controlled, and the output current during by guard mode involution is controlled can adopt relatively low precision.That is, according to said structure, the 2nd current detector can adopt the current detector of lower accuracy, thereby can reduce the parts cost of field power supply.
And the present invention can be configured to: described field power supply has a plurality of described power cells, and possesses: main control unit, output current command value, equates the detected value of described the 1st current detector and the setting output current value of described field power supply integral body, and command value distributor, the described current instruction value of being exported by described main control unit is distributed to each power cell, wherein, described the 1st current detector is the current detector that detects the output current value of described field power supply integral body, described the 2nd current detector is arranged in each power cell, it is the current detector that detects the output current value of this each power cell, the described current control device that is arranged at each power cell is controlled the output current value of each power cell, the detected value of described the 2nd current detector is equated with the current instruction value that described command value distributor distributes.
According to said structure, even thereby in the situation that in the amplifier in certain power cell in a plurality of power cell generation part defect cause this power cell cannot discharge stabling current, can send the current instruction value that it is compensated by main control unit.And, by command value distributor, each power cell is distributed to current instruction value.And, the current control device of each power cell equates by each output current value is controlled the current instruction value that its and instruction value distributor distributes, therefore, can there is not extreme bias current to normal power cell in electric current, thereby can prevent on the whole Biased flow phenomenon.
In addition, the present invention can be configured to: described the 1st current detector is arranged on the position of connecting with described contact, and, be arranged on the output loop of the described power cell under described contact closure condition and the common part of described superconducting coil side loop, described re-setting device is made as currency by the detected value of described the 1st current detector when involution button is pressed, and, the desired value of described the 1st current detector is made as to 0, according to predetermined sweep speed power ratio control unit, make the detected value of described the 1st current detector consistent with 0, disconnect afterwards described contact.
According to said structure, according to predetermined sweep speed, make the detected value of the 1st current detector consistent with 0, thus, and by guard mode involution during to normal condition, the infringement that can suppress to bring to power cell.
In addition, in the description of above-mentioned " making the detected value of the 1st current detector consistent with 0, afterwards break contact ", " unanimously " has more than and refers to 0 in full accordly, and refers to and roughly reaches 0.That is, can not reach 0 completely.As long as being shown, the detected value and 0 one of the 1st current detector can prevent that the current value generation cataclysm of passing through in superconducting coil from also can prevent the degree of this superconducting coil generation quench after contact disconnects.
In addition, the present invention can be configured to: described the 1st current detector is arranged on the position of connecting with described contact, and, be arranged on the output loop of the described power cell under described contact closure condition and the common part of described superconducting coil side loop, described re-setting device is made as desired value by the additive value of the detected value of the detected value of described the 1st current detector and described the 2nd current detector when involution button is pressed, according to predetermined sweep speed power ratio control unit, make the detected value of described the 2nd current detector consistent with this desired value, disconnect afterwards described contact.Here, preferably repeatedly implement successively the addition calculation of the detected value of described the 1st current detector and the detected value of described the 2nd detector, upgrade successively desired value.
According to said structure, the control of power part is identical with common scan control thereby easily control.In addition, here said " unanimously " also not only refer in full accordly, but comprise roughly consistent implication.
In addition, according to a second aspect of the invention, provide a kind of method of operation of field power supply, wherein, described field power supply carries out excitation to superconducting magnet, and this field power supply comprises: power supply; Power cell, is connected with described power supply; Protective device, occurs when abnormal when detecting described power supply, described power cell or superconducting magnet, closure make described power cell output two terminal shortcircuits contact and become guard mode; And the 1st current detector, be arranged on and possess in the superconducting coil of described superconducting magnet and the loop of described contact, for detection of the current value in this loop, described power cell comprises: amplifier; The 2nd current detector, detects the output current value of described power cell; And current control device; control described output current value; described method of operation is characterised in that; behind the closed described contact by described protective device; utilize the detected value of described the 1st current detector and described the 2nd current detector to make described output current value consistent with the current value passing through in described superconducting coil; disconnect afterwards described contact, thereby by guard mode involution.
In addition, according to a third aspect of the present invention, the field power supply that provides a kind of superconducting magnet of carrying out excitation to possessing the superconducting magnet of superconducting coil to use, is characterized in that, comprising: power supply; Power cell, is connected with described power supply; Protective device, occurs when abnormal detecting described power supply, described power cell or described superconducting magnet, closure make described power cell output two terminal shortcircuits contact and become guard mode; And storage device, behind the closed described contact by described protective device, the output current value to described power cell before closing moment or this closing moment is stored, and described power cell has: amplifier; Current detector, detects the output current value of described power cell; And current control device; control described output current value; the field power supply that described superconducting magnet is used also comprises re-setting device; behind the closed described contact by described protective device; described re-setting device utilizes the detected value of described current detector and the storing value of described storage device to make described output current value consistent with the current value passing through in described superconducting coil, thereby disconnects afterwards described contact by guard mode involution.
According to said structure, use a current detector.Originally, if take, by microcomputer, control as prerequisite, calculating and store nearly all can be next corresponding by the program (software) of microcomputer, therefore has the advantage that can omit as the current detector of hardware component.
In addition, the present invention can be configured to, and also comprises: timer, measure the elapsed time from the moment of output current value described in described memory device stores; And correcting device; the correction value of the elapsed time of measuring according to described timer and pre-stored unit interval is revised the storing value of described storage device; wherein; described re-setting device utilizes the detected value of described current detector and by the storing value of the revised described storage device of described correcting device behind the closed described contact by described protective device; make described output current value consistent with the current value passing through in described superconducting coil, disconnect afterwards described contact.
According to said structure, owing to not only comprising storage device, also comprise timer and correcting device, therefore can be more reliably by guard mode involution.
And in the invention described above, more preferably making the contact of two terminal shortcircuits of the output of power cell is B contact.According to said structure, even at long-time power down mode, by guard mode involution, to normal condition, can be able to be there is not to quench phenomenon in the superconducting coil of quench not yet.
According to the present invention, behind the closed above-mentioned contact by protective device, make the output current value of power cell consistent with the current value passing through in superconducting coil, break contact afterwards, thereby by guard mode involution.Thus, even because the detection sensitivity of abnormality having been carried out to error detection or having improved main power voltage rapid drawdown causes the output two ends of field power supply to be short-circuited, afterwards, also promptly involution is to normal condition (non-short-circuit condition).And, for example, when main power source has a power failure or when the inner fuse of field power supply changes, occurred extremely need to process unusual condition, by taking to restore electricity or changing the measures such as fuse and in the situation of involution normal condition, promptly involution is afterwards to normal condition (non-short-circuit condition).
Accompanying drawing explanation
Fig. 1 means the structure chart of the field power supply of the 1st execution mode of the present invention.
The flow chart of action when Fig. 2 means by guard mode involution.
Fig. 3 means the structure chart of the field power supply of the 2nd execution mode of the present invention.
Fig. 4 means the structure chart of the field power supply of the 3rd execution mode of the present invention.
Fig. 5 means the structure chart of the field power supply of the 4th execution mode of the present invention.
Fig. 6 means the structure chart of the field power supply of the 5th execution mode of the present invention.
Fig. 7 means the structure chart of the field power supply of the 6th execution mode of the present invention.
Label declaration
1: power supply
2: superconducting magnet
2L: superconducting coil
3: power cell
4: protection relay
4a: contact
5: the 1 shunt resistance (the 1st current detector)
7: transistor (amplifier)
8: the 2 shunt resistances (the 2nd current detector)
9: current control circuit (current control device)
16: protective circuit (protective device)
100: internal abnormality signal
101: field power supply
Embodiment
Below, with reference to accompanying drawing, embodiments of the present invention are described.
(the 1st execution mode)
Fig. 1 means the structure chart of the field power supply 101 of the 1st execution mode of the present invention.
(structure of field power supply 101)
As shown in Figure 1, field power supply 101 comprises power supply 1, power cell 3, the 1st shunt resistance (the 1st current detector) and protective circuit 16 (protective device).
(power supply)
(the 1st current detector)
As current detector (the 1st current detector), can adopt by Hall element and detect the non-contact type current detector in the magnetic field being produced by electric current but not shunt resistance (the 2nd shunt resistance 8 described later is like this too).The 1st shunt resistance 5 is arranged on the position (and being the position in the loop A of output current value that can detection power unit 3 under the state of break contact 4a) that can detect the current value in the A of loop; wherein, above-mentioned loop A comprises the contact 4a of superconducting coil 2L and protection relay 4.
(power cell)
On power supply 1, be connected with power cell 3.Power cell 3 comprises: as the transistor 7 (being generally a plurality of transistors) of amplifier, even the 2nd shunt resistance 8 (the 2nd current detector) of output current value that still can detection power unit 3 under guard mode (state of contact 4a closure), the current control circuit 9 (current control device) of the output current value of power ratio control unit 3, to the current command circuit 10 of current control circuit 9 instruction current values (current-order device), sweep speed setting apparatus 33 to current command circuit 10 beacon scanning speed, cooperate with current command circuit 10 and make by the involution circuit 31 (re-setting device) of guard mode involution and for the involution button 32 to involution circuit 31 indication involutions (starting involution controls).In addition, and the nonessential building block of sweep speed setting apparatus 33, involution circuit 31 and involution button 32 being regarded as to power cell 3, that is, also can be regarded as the building block that is different from power cell 3.
(amplifier)
(by the re-setting device of guard mode involution)
In addition, in the description of above-mentioned " making the output current value of power cell 3 consistent with the current value passing through in superconducting coil, afterwards break contact 4a ", " unanimously " also not only refers in full accord, and refers to roughly consistent.That is between the current value, passing through, can there is a little difference in the output current value of power cell 3 and superconducting coil 2L.As long as the current value one that makes to pass through in the output current value of power cell 3 and superconducting coil 2L is shown, can prevent the current value generation cataclysm of passing through in superconducting coil 2L and can prevent that this superconducting coil 2L from the degree of quench occurring after contact 4a disconnects.
In addition, as in the present embodiment, not only can form respectively current control circuit 9 and involution circuit 31, and the two can be formed to a circuit structure.
And in the present embodiment, current control device, re-setting device and protective device have adopted the form of circuit structure, but also can adopt by microcomputer (microcomputer) etc., carry out programme controlled controller, and control by this controller.Now, because program setting has the degree of freedom, therefore easily set change.About current command circuit 10 described later, current control circuit (19,29), distributor 14 and main control circuit 12 etc., like this too.
In addition, can involution circuit 31 not enrolled in field power supply 101 yet, and only the 1st shunt resistance 5 is used as to electric current demonstration detector, and with manual mode, utilize involution circuit 31 to control by operator (people).Refer to aftermentioned.
(current-order device)
In addition,, when by guard mode involution, involution circuit 31 is usingd the detected value (current detection value) of the 1st shunt resistance 5 as desired value, cooperates to current control circuit 9 output current values with current command circuit 10.And, involution circuit 31 cooperates with current control circuit 9, read in the detected value of the 1st shunt resistance 5 as desired value, after making the detected value of this desired value and the 2nd shunt resistance 8 consistent, break contact 4a (utilizes the output current value of the detected value power ratio control unit 3 of the 2nd shunt resistance 8.The detected value of the 1st shunt resistance 5 is used as desired value).Here, guard mode refers to the state (short-circuit condition) of contact 4a closure.Involution refers to the process that is entered off-state by closure state.
In addition, conventionally, when using current splitter to carry out Current Feedback Control, the electric current of institute's instruction is carried out to FEEDBACK CONTROL, therefore, substantially, when instruction is sent, output current will be adjusted into above-mentioned instruction current in real time.In the above description, for ease of understanding, description be make consistent with the detected value of the 2nd shunt resistance 8.In fact, the concrete method adopting is: if the output valve of current command circuit 10 is consistent with the value of the 1st shunt resistance 5 as desired value, 9 pairs of the 2nd shunt resistances 8 of current control circuit and above-mentioned command value contrast and adjust immediately, and therefore " detected value of the 2nd shunt resistance 8 " can be considered " the output order value of current command circuit 10 ".In addition, as initial explanation, can also be in fact to utilize the detected value of the 2nd shunt resistance 8 to be confirmed whether consistent method.
In addition, expression voltage collapse from the controller (not shown) etc. that has used described microcomputer to protective circuit 16 (protective device) input that also produced by is abnormal, the internal abnormality signal 100 of power failure etc.
(protection relay)
In addition, if consider power down mode (state that relay (protection relay 4) is not powered), the contact 4a of protection relay 4 preferably consists of B contact (normally closed).In execution mode described later, identical therewith.If contact 4a consists of B contact, so, under power down mode, even if involution circuit 31 (re-setting device) does not move because of power failure, because contact 4a closure still can make to export two ends in short-circuit condition.Therefore the electric current, not passing through in the superconducting coil 2L of quench can reflux by contact 4a.Afterwards, when main power source recovers, action that can be by involution circuit 31 (re-setting device) by guard mode involution to normal condition.On the other hand, in the situation that contact 4a consists of A contact, if interruption duration is shorter, involution circuit 31 still moves, if interruption duration is longer, involution circuit 31 causes contact 4a to disconnect with regard to no longer moving.Consequently, the electric current not passing through in the superconducting coil 2L of quench can not be realized backflow.
Here, protective circuit 16 is over-voltage detection circuit.Protective circuit 16 is configured to: for example, when the set point of the exciting voltage of superconducting coil 2L is 10V, if exciting voltage surpasses 12V, is judged as overvoltage (extremely) and sends signal to protection relay 4 and current command circuit 10.In addition, protective circuit is varied, is not limited to over-voltage detection circuit.
Here, current command circuit 10 is configured to: when receiving self-protection circuit 16 signal, it is 0 that current control circuit 9 is sent to the output current that instruction makes power cell 3.In addition, protection relay 4 is configured to: when receiving self-protection circuit 16 signal, contact 4a is closed.
In the present embodiment, exemplified with protective circuit 16 is enrolled, in field power supply 101, detect superconducting magnet 2 and whether have abnormal situation.Present embodiment also can be configured to: in field power supply 101, enroll detection power supply 1 and power cell 3 and whether have abnormal circuit (device); at this circuit, have quench detection information, and to protection relay 4 and current command circuit 10, send signal by this circuit.Detect the circuit whether power supply 1 and power cell 3 exist abnormal circuit extremely to detect such as overheated, overcurrent, main power voltage rapid drawdown and the power failure etc. that are configured to power supply 1 and power cell 3.
(the guard mode involution of field power supply is controlled)
Below, the involution of guard mode is controlled and described.The flow chart of action when Fig. 2 means by guard mode involution.
When protective circuit 16 detects superconducting magnet 2, occur when abnormal, by protective circuit 16, by by protection relay 4 closing contact 4a, and by current control circuit 9, to make the output current of power cell 3 be 0.Now, as shown in IA in Fig. 1, the electric current passing through in superconducting coil 2L is by comprising the loop A of the contact 4a of superconducting coil 2L and protection relay 4.On the other hand, the electric current I B passing through from the transistor 7 of power cell 3 becomes 0.When detecting power supply 1 and power cell 3 abnormal, situation is identical therewith.
Here, in the situation that quench occurs superconducting coil 2L, due to this superconducting coil there is resistance in normal conducting state in 2L, thereby IA decays fast.But the factors such as noise may cause protective circuit 16 misoperations.In addition, also there is this situation, that is: in superconducting coil 2L, occur wink press but just revert to afterwards superconducting state.In addition, main power source inapparent voltage collapse also may cause protective circuit 16 to be moved.In these cases, due to the state of superconducting coil 2L in superconduction, so the resistance of loop A is minimum, and electric current I A becomes 0 may need the time of approximately 1 day.Although can make electric current I A become 0 by break contact 4a, this operation will cause superconducting coil 2L quench.Quench is by the infringement of bringing to superconducting coil 2L by force.
Here, in field power supply 101, flow process is controlled like that as shown in Figure 2.When involution button 32 is pressed (S1, the abbreviation of step 1), current command circuit 10 is usingd the detected value (current value) of the 1st shunt resistance 5 as desired value, to current control circuit 9 output current values.Current control circuit 9 reads in the detected value (current value) of the 1st shunt resistance 5 as desired value (S2).Then, current control circuit 9 is using the desired value of the 1st read in shunt resistance 5 as set point (S3).In addition, current control circuit 9 is by current command circuit 10, reads in the value of predefined sweep speed or from the value (S4) of the sweep speed of sweep speed setting apparatus 33.Then, current command circuit 10 improves the current instruction value to current control circuit 9 outputs according to predetermined sweep speed, makes the detected value (output current value of power cell 3) consistent with set point (S5) of the 2nd shunt resistance 8.Repeatedly carry out S2～S5, until IA is consistent with IB.Then, when confirming as IA=IB, 31 pairs of protection relays 4 of involution circuit send the signal that disconnects its contact 4a, and contact 4a disconnects (S6).In addition, about IA=IB, IB may be actually the detected value of the 2nd shunt resistance 8, may be also the current instruction value to current control circuit 9 outputs by current command circuit 10.In addition, in above-mentioned flow process, in S2, all read in the value of the 1st shunt resistance 5, but because the processing time is short, the coil current (IA) of decay is minimum, therefore, also can adopt the method for repeatedly carrying out S3～S6 after Exactly-once S2 therebetween at every turn.
(the 2nd execution mode)
Fig. 3 means the structure chart of the field power supply 201 of the 2nd execution mode of the present invention.Only be the position of the 1st shunt resistance (the 1st current detector) with the difference of the 1st execution mode.In the present embodiment, the 1st shunt resistance 5 is arranged on to the position arranged side by side with superconducting coil 2L.Like this, the 1st shunt resistance 5 is arranged on to the position that can detect the electric current I A passing through in superconducting coil 2L after the contact 4a closure of protection relay.In other words, the 1st shunt resistance 5 is arranged on the position of connecting with contact 4a, and, be arranged on the common part of the output loop B of the power cell 3 under the 4a closure state of contact and the loop A of described superconducting coil 2L side.
In the present embodiment, current control circuit 9 improves the output current value of power cell 3 according to predetermined sweep speed, make the detected value (current detection value) of the 1st shunt resistance 5 become 0.The detected value of the 1st shunt resistance 5 is 0 to refer to that the IA of mutual reverse flow is consistent with IB.When confirming as IA=IB, current control circuit 9 sends the signal of break contact 4a to protection relay 4, and contact 4a disconnects.
In addition, as variation, can be configured to: when involution button 32 is pressed, the additive value of the detected value of the detected value of the 1st shunt resistance 5 and the 2nd shunt resistance 8 is made as to desired value, according to predetermined sweep speed, make the detected value of the 2nd shunt resistance 8 consistent with this desired value, afterwards break contact 4a.Here, preferably repeatedly implement successively the addition calculation of the detected value of the 1st shunt resistance 5 and the detected value of the 2nd shunt resistance 8, and desired value is upgraded successively.IA, with respect to IB reverse flow, is the electric current that is greater than IB, and therefore the detected value of the 1st shunt resistance 5 is " IA-IB ".The detected value of the 2nd shunt resistance 8 is " IB ".Therefore, the additive value of the detected value of the detected value of the 1st shunt resistance 5 and the 2nd shunt resistance 8 is " IA ".
As another variation, control as follows with above-mentioned control mode combination, that is: when involution button 32 is pressed, according to predetermined sweep speed, control and make the detected value of the 1st shunt resistance 5 consistent with 0, and the additive value of controlling the detected value that makes the detected value of the 2nd shunt resistance 8 and the detected value of the 1st shunt resistance 5 and the 2nd shunt resistance 8 according to predetermined sweep speed is consistent.Then, control the stage break contact 4a making in following two stages early, that is: in the detected value of the 1st shunt resistance 5 stage consistent with 0; The stage that the detected value of the 2nd shunt resistance 8 is consistent with the additive value of the detected value of the 1st shunt resistance 5 and the detected value of the 2nd shunt resistance 8.According to above-mentioned excitation power supply, more promptly involution is to normal condition (non-short-circuit condition).
As mentioned above, according to the present invention, utilize the detected value of the 1st shunt resistance 5 and the 2nd shunt resistance 8, make the output current value of power cell 3 consistent with the current value passing through in superconducting coil 2L, break contact 4a, can prevent break contact after-current generation cataclysm thus afterwards.Therefore, can prevent the quench of superconducting coil 2L.; according to the present invention; even owing to abnormality being carried out to error detection and cause output two terminal shortcircuits of field power supply (power cell 3), also can come promptly involution to normal condition (non-short-circuit condition) by break contact 4a after making the output current value of power cell 3 consistent with the current value passing through in superconducting coil 2L.
In addition,, according to the present invention, promptly involution is to normal condition; therefore; for example, even cause the occurrence frequency of misoperation increase and misoperation occurs because improving the abnormal state detection grade of protective circuit 16, involution to normal condition also not need the too many time.; even if improved, the abnormal state detection grade of quench etc. is not produced to obstacle (wanting involution to normal condition not need the too many time) yet; by improving, to the detection level of abnormality, can make contact 4a move more delicately; therefore; compare to prior art and can prevent better the damage to field power supply (101,201) or superconducting magnet 2.Abnormal, the main power voltage rapid drawdown occurring about field power supply inside, power failure etc. are abnormal, like this equally.
In addition; in the 1st execution mode; the 1st shunt resistance 5 that use detects the electric current passing through in the superconducting coil 2L in the A of loop; and using its detected value as desired value; as variation, can be configured to: under normal condition, utilize the output current value of the detected value power ratio control unit 3 of the 1st shunt resistance 5; when by guard mode involution, utilize the detected value of the 2nd shunt resistance 8 to carry out the output current value of power ratio control unit 3.As mentioned above, the control in field power supply 101 is specially: when normal condition and involution, switch the current detector of controlling for output current.On the other hand, the output current that compares to normal condition is controlled, and the output current during by guard mode involution is controlled can adopt relatively low precision.; the advantage of said structure: the 2nd shunt resistance 8 adopts the current detector of lower accuracy; even under guard mode (state of contact 4a closure), the 1st shunt resistance 5 by degree of precision also can carry out more high-precision current detecting (demonstration) to the electric current passing through in superconducting coil 2L.
In addition, in the 1st execution mode, the 2nd shunt resistance 8 is implemented output current values to power cell 3 during for normal condition and involution and is controlled, and the 1st shunt resistance 5 can be only for showing.In this case, when by guard mode involution, operator can be set as the show value of the 1st shunt resistance 5 involution by set point and increase the output current value of power cell 3, and when IA is consistent with IB, break contact 4a completes involution.And, in the above description, finally by operator, confirm that whether IA is consistent with IB.Then, operator presses the button with manual mode break contact 4a.
(the 3rd execution mode)
Fig. 4 means the structure chart of the field power supply 301 of the 3rd execution mode of the present invention.Present embodiment and the 1st execution mode difference are mainly: the field power supply 301 of present embodiment possesses 2 (a plurality of) power cells.In addition, also can make field power supply possess 3 above power cells.
As shown in Figure 4, field power supply 301 comprises power supply 1, the 1st power cell the 13, the 2nd power cell the 23, the 1st shunt resistance 5 (the 1st current detector), main control circuit 12 (main control unit), distributor 14 (command assignment device), sweep speed setting apparatus 33, protective circuit 16 (protective device), involution button 32 and involution circuit 131.
(the 1st current detector)
The 1st shunt resistance 5 is the current detectors that detect the output current value of field power supply 301 integral body.In addition, the 1st current detector is arranged on the position of output current value in the loop A that can detect the contact 4a that comprises superconducting coil 2L and protection relay 4 under guard mode (2 power cells 12 and 13 whole output current value).
(power cell)
On power supply 1, be connected with 2 power cells 13 and 23.The 1st power cell 13 possesses transistor 17 (being generally a plurality of transistors), the 2nd shunt resistance 18 (the 2nd current detector) of output current value of detection power unit 13 and the current control circuit 19 (current control device) of the output current value of power ratio control unit 13 as amplifier.
The structure of the 2nd power cell 23 is identical with the 1st power cell 13, and the 2nd power cell 23 possesses transistor 27 (being generally a plurality of transistors), the 2nd shunt resistance 28 (the 2nd current detector) of output current value of detection power unit 23 and the current control circuit 29 (current control device) of the output current value of power ratio control unit 23 as amplifier.
In addition, the building block ( power cell 13 and 23 shared building blocks) that also main control circuit 12, distributor 14, switch 30, involution circuit 131, involution button 32 and sweep speed setting apparatus 33 can be regarded as to power cell 13 and 23.
(main control unit)
The control section of main control circuit 12 is configured to: to distributor 14 output current command value, the detected value (current value) of the 1st shunt resistance 5 is equated with the setting output current value of field power supply 301 integral body.Particularly, it is configured to: obtain the deviation of detected value and the setting output current value of the 1st shunt resistance 5, the current instruction value being directly proportional to gained deviation to distributor 14 outputs.
(command assignment device)
(about current control circuit 19 and 29)
Here, the current control circuit 19 and 29 that is arranged at each power cell 13 and 23 is configured to: control the output current value of each power cell 13 and 23, the detected value (current value) of the 2nd shunt resistance 18 and 28 is distributed and the current instruction value exported equates with by distributor 14.
(switch)
Switch 30 switches and by one of them input distributor 14 for the signal to from main control circuit 12 and from the signal of involution circuit 131.Switch 30 is started by involution circuit 131.
(action of field power supply)
Below, the action of the normal condition of field power supply 301 (non-guard mode) is described.
In non-protective circuit, start (contact 4a closure state) or non-involution pattern (from the 4a closure state of contact; make IA consistent with IB; then, under the normal condition serial state till break contact 4a), the field power supply 301 of present embodiment has preventing or alleviates the function of the Biased flow phenomenon of electric current.The Biased flow phenomenon here refers to: in the inside of certain power cell during because of the problem such as certain is former thereby production part is bad or conductor is deteriorated, by other normal power cells, the output current of the power cell having problems is compensated, thereby cause electric current to above-mentioned other normal power cell bias currents.
Situation as generation current Biased flow phenomenon, for example, because the performance of the cooling device (not shown) arranging in the 1st power cell 13 reduces the temperature making in the 1st power cell 13, rise, thereby compare to other normal the 2nd power cells 23, electric current flows through the 1st power cell 13 in a large number.In this case, for the multiple current of crossing passing through in the 1st power cell 13 is compensated, the electric current passing through in the 2nd power cell 23 is less than the 1st power cell 13 (Biased flow phenomenon).In addition, for example, because of the transistor 17 in the 1st power cell 13, element such as grade is deteriorated also may cause Biased flow phenomenon.
According to the field power supply 301 of present embodiment, main control circuit 12 controls to the 1st power cell 13 and the 2nd power cell 23 output current command value, to make to reach the whole output current value with setting in current settings instruction department (not shown) by measuring the output current value that voltage that the two ends of the 1st shunt resistance 5 produce obtain, the current instruction value that distributor 14 is exported by main control circuit 12 to the 1st power cell 13 and the 2nd power cell 23 distribution.And, the current control circuit 19 (current control circuit 29) of the 1st power cell 13 (the 2nd power cell 23) is controlled, and makes to reach by measuring the detected output current value of voltage of the two ends generation of the 2nd shunt resistance 18 (the 2nd shunt resistance 28) current instruction value being distributed by distributor 14.Thus, transistor 17 generation parts such as element such as grade in the 1st power cell 13 are bad, the 1st power cell 13 occurs cannot be exported in the situation of given electric current, by main control circuit 12, sent the current instruction value that it is compensated, and distribute current instruction value by 14 pairs of the 1st power cells 13 of distributor and the 2nd power cell 23.And, the current control circuit 19 of the 1st power cell 13 and the current control circuit 29 of the 2nd power cell 23 are controlled and are made to reach the current instruction value being distributed by distributor 14, therefore, can not cause normal the 2nd power cell 23 that extreme electric current bias current occurs, like this, thus just can on the whole electric current equalization be prevented to electric current Biased flow phenomenon.
In addition, compare to the magnification ratio of main control circuit 12, the magnification ratio of Current Control electric current 19 and current control circuit 29 is less.Therefore, the current control circuit 19 of the 1st power cell 13 and the current control circuit 29 of the 2nd power cell 23 allow and have slight Biased flow phenomenon, and carry out strict Current Control by main control circuit 12, and the whole electric current passing through is expected to realize stabilisation.That is, can prevent that extreme Biased flow phenomenon from appearring in field power supply 301 on the whole.
In addition, compare to the 2nd shunt resistance 18 and the high-precision resistor of 28, the 1 shunt resistances 5 employing.Can reduce the cost of field power supply 301 thus.
In addition, the structure of distributor 14 nonessential employing present embodiment.As long as overall system control (current instruction values of field power supply 301 integral body (power cell is whole)) can be divided into the current-order of each power cell 13 and 23 inputs.
(explanation of guard mode)
In addition, when protective circuit 16 detects quench in superconducting coil 2L galvanization, its signal enters main control circuit 12 and current-order is made as to 0 via protective circuit 16.Thus, IB1 and the IB2 from power component 17 and 27 outputs becomes 0.Meanwhile, protective circuit 16 is closed by contact 4a.Electric current I A by superconducting coil 2L passes through contact 4a before.Here, when the certain quench of superconducting coil 2L, IA sharp-decay.On the other hand, when error detection quench, IA is not decay almost, thereby decay needs the long period.
Therefore, when pressing involution button 32, the first output to involution circuit 131 by the output switching of main control circuit 12 of involution circuit 131.Switch 30 is switched to the contact of 30b by 30a.With main control circuit 12 similarly, the detected value of electric current is by the 1st shunt resistance 5 input involution circuit 131.Involution circuit 131 is usingd the detected value of the 1st shunt resistance 5 as desired value, and generates for improving the command value of current-order and output it to distributor 14 gradually according to the value of sweep speed setting apparatus 33.With normal condition (non-guard mode) similarly, 14 pairs of 2 power cells of distributor (13 and 23) distribute current-order.When instruction current is when reaching desired value IA by the definite sweep speed of involution circuit 131, the aggregate value of electric current I B1, the IB2 of 2 power cells (13 and 23) that distribute is consistent with IA.
As mentioned above, the function that field power supply 301 has with the 1st, the field power supply of the 2nd execution mode is identical, that is: involution circuit 131 starts, utilize the detected value (aggregate value of the 2nd shunt resistance 18 and 28 detected value) of the 1st shunt resistance 5 and the 2nd shunt resistance 18 and 28, make the output current value of power cell integral body consistent with the current value passing through in superconducting coil 2L, break contact 4a, prevents break contact 4a after-current generation cataclysm thus afterwards.
In addition, the difference of involution pattern and normal mode is: in normal mode, by the 1st shunt resistance 5, record whole electric current, and make the error between its correction and whole instruction to distributor 14 outputs; In involution pattern, the current instruction value only being generated by involution circuit 131 to distributor 14 outputs.Result is according to the precision of the 2nd shunt resistance 18 and 28, IB1 and IB2 to be controlled.Here, for example, from the viewpoint of cost cutting, the 2nd shunt resistance 18 and 28 adopts the more whole low current detector (current detector that current detection accuracy is low) of splitter (the 1st shunt resistance 5) of precision.In addition, owing to being dual control system, so each unit (power cell 13 and 23) adopts lower feedback oscillator.Therefore, compare to normal mode, IB1, IB2 are coarse value.(IB1+IB2) ≈ IA, as long as roughly consistent, just can involution become normal mode afterwards, therefore, allows to exist some errors.
When IB1+IB2 and IA are roughly consistent, involution circuit 131 transmits current current value I A to main control circuit 12.Then, switch 30 is switched to 30a side, simultaneously break contact 4a.Then, under normal mode, carry out Current Control electric current is remained and sets current value I A.In addition, the value that IA can adopt main control circuit 12 to store when quench produces.If use to detect current value I A, when turning back to normal mode, and originally wanted to produce a little error between the current value of the superconducting coil 2L that controls, therefore, now by usual way, finely tune again.
In addition, in the 3rd execution mode, divide main control circuit 12 and 131 pairs of circuit structures of involution circuit to be illustrated, in function aspects, existence is used as feedback signal (main control circuit) and the difference as desired value (involution circuit) by the current detection value of the 1st shunt resistance 5 by the current detection value of the 1st shunt resistance 5, and the output valve of distributor 14 is slightly different, but on circuit structure, receive the signal input of the 1st shunt resistance 5, the signal that receives sweep speed setting apparatus 33, these aspects of current signal that generate predetermined sweep speed are identical.Conventionally, these processing are carried out the laggard line output of analog-converted by microcomputer and DA transducer, therefore, (1) whether there is the input of involution button 32, the difference of the processing of the detected value of (2) the 1st shunt resistances 5, (3) are the minute differences of the program of built-in microcomputer to the difference of the content of the signal of distributor output etc., thereby preferably main control circuit 12 and involution circuit 131 are formed as one.
(the 4th execution mode)
Fig. 5 means the structure chart of the field power supply 401 of the 4th execution mode of the present invention.The field power supply 401 of present embodiment is the variation of the field power supply 301 of the 3rd execution mode.As shown in Figure 5, field power supply 401 comprises power supply 1, the 1st power cell the 13, the 2nd power cell the 23, the 1st shunt resistance 5 (the 1st current detector), main control circuit 12 (main control unit), distributor 14 (command assignment device), sweep speed setting apparatus 33, protective circuit 16 (protective device), involution button 32 and involution circuit 231.
Below, to for example controlling and describe by the involution after protective circuit 16 closing contact 4a.By the 1st shunt resistance 5, detect after the current value of IA, using this as desired value control (IB1+IB2), carrying out involution when action, by obtaining (IB1+IB2) for calculating the adder 304 of aggregate value of the current detection value of the 2nd shunt resistance 18 and the 2nd shunt resistance 28.By adder, risen by switch 302 and 303 to main control circuit 12 input switching signals, to replace the signal from the 1st shunt resistance 5 under normal mode.Switch 302 and 303 is according to move (switching) from the signal of involution circuit 231.
When IA is consistent with (IB1+IB2), thus by involution circuit 231 double-throw contact 4a and switch 302 and 303 involutions to normal condition (break contact 4a.Switch 302 and 303 switches to respectively 302a and 303a.)。Normal mode when switch 302 and 303 is switched to respectively 302a and 303a is involution pattern while being switched to respectively 302b and 303b.And, also can, always to the detected value of main control circuit 12 input the 1st shunt resistances 5, carry out the corresponding IA of decay gradually.
In involution pattern (involution control), because preventing the 2nd shunt resistance 18 of bias current and the aggregate value of 28 current detection value, utilization replaces the 1st shunt resistance 5, therefore,, for the consideration of cost aspect, the 2nd shunt resistance 18 and 28 can adopt the current detector of lower accuracy.In this case, only when involution, the accuracy of detection of (during involution pattern) electric current reduces.But, after involution, become normal mode, start to control with the 1st shunt resistance 5 (whole splitter), therefore, Current Control precision involution is afterwards normal.Acting as of this involution pattern prevents that when involution thereby superconducting coil 2L from existing larger curent change not make it produce the phenomenons such as quench, the error of above-mentioned degree (error of amperometric determination precision) can't produce larger curent change, so, there is not any problem.
(the 5th execution mode)
Fig. 6 means the structure chart of the field power supply 501 of the 5th execution mode of the present invention.The field power supply 501 of present embodiment has omitted the 1st shunt resistance 5 using in the field power supply 101 of the 1st execution mode, the substitute is memory circuit 50 is enrolled in power cell 43.Memory circuit 50 is storage devices that the output current value of the power cell 43 by before 31 closing contact 4a back contact 4a closing moments of involution circuit or this closing moment is stored.In addition, in the example shown in Fig. 6, adopt the structure by the detected value of memory circuit 50 storage shunt resistances 8 (current detector), also can adopt the structure of the current instruction value being sent to current control circuit 9 by memory circuit 50 storages.Storage device is varied, except battery backup RAM, also has Nonvolatile memory devices.In addition, conventionally for digitlization, via ADC (analog to digital converter) etc., be stored in storage device.
In addition; the involution circuit 31 of present embodiment is configured to such re-setting device; that is: after passing through protective circuit 16 closing contact 4a; utilize the detected value of shunt resistance 8 and the storing value of memory circuit 50 to make the output current value of power cell 43 consistent with the current value passing through in superconducting coil 2L, thereby break contact 4a is by guard mode involution afterwards.Below, be specifically described.
For example, when detecting superconducting magnet 2, occur when abnormal, protective circuit 16 is almost simultaneously to memory circuit 50, current command circuit 10 and protection relay 4 transmitted signals.50 pairs of power cells 43 of memory circuit are stored at the output current value in this moment.Current command circuit 10 is made as 0 by the current instruction value that current control circuit 9 is sent, thereby makes power cell 43 be output as 0.In addition, the action by protection relay 4 makes contact 4a closed, thereby makes the output short-circuit of power cell 43.In addition, protective circuit 16 before memory circuit 50 can be to contact 4a closure and the output of power cell 43 reduce to moment that the output current value of (normal condition) before 0 stores to memory circuit 50 transmitted signals.
In addition, certainly, when comprising the control of abnormality processing by microcomputer or sequence controller, in these devices built-in wink stopping detecting circuit signal be difficult to input protection circuit 16 (when the stopping time in wink being detected, to outside, carry out State-output, self stops sequence controller, therefore after, cannot use), therefore, wink stopping detecting circuit and by this signal input protection circuit 16 is set separately, or, for example, if have microcomputer or the sequence controller of the abnormality processing of being not used in, by in these devices built-in wink stopping detecting circuit signal input protection circuit 16.And, for the microcomputer, sequence controller or other the equipment that make to control for example, in wink stopping detecting circuit temporary transient (about 3 seconds) performance function still after detecting stopping in wink of main power source, need to have than common large electrochemical capacitor at its power unit, or arranging changeable is battery-driven device, wherein, above-mentioned control comprises abnormality processing.
Here, at flase drop, measuring superconducting magnet 2 occurs when abnormal, by L and R, electric current I A decayed, but because the very big R of L is minimum so it is very little to decay, for example, through 5 minutes, only decay approximately 1%.On the other hand, the state if operator notes abnormalities, operator presses involution button 32.Thus, involution circuit 31 reads in the storing value of for example 200A of memory circuit 50, and the output IB of power cell 43 is controlled to 200A.Sending the moment that IB is controlled to the instruction of 200A, involution circuit 31 judgement IB reach consistent with IA, involution circuit 31 break contact 4a.In fact, even if IA decays to 198A, if this degree is poor, can cause superconducting magnet 2 quench or field power supply 501 itself to break down, and directly the electric current passing through in magnet is adjusted to 200A.
According to field power supply 501, use a current detector.Originally, if will use microcomputer as prerequisite in control, almost all next corresponding by the program (software) of microcomputer owing to calculating and storing, therefore there is the current detector that can omit as hardware component.
(the 6th execution mode)
Fig. 7 means the structure chart of the field power supply of the 6th execution mode of the present invention.The field power supply 601 of present embodiment is the variation of the field power supply 501 of the 5th execution mode.In the present embodiment, power cell 53 also comprises timer 51 and correction circuit 52.
In addition; the involution circuit 31 of present embodiment is configured to: after protective circuit 16 closing contact 4a; the storing value that involution circuit 31 utilizes the detected value of shunt resistance 8 and is corrected the revised memory circuit 50 of circuit 52 makes the output current value of power cell 53 consistent with the current value passing through in superconducting coil 2L, afterwards break contact 4a.Below, be specifically described.
For example, suppose to make contact 4a closed because protection relay 4 actions occur extremely to cause for error detection superconducting magnet 2, operator's state that notes abnormalities after 5 minutes, operator presses involution button.Now, involution circuit 52 reads in the storing value of for example 200A of memory circuit 50, and reads in the value in for example 5 minutes (elapsed time of mensuration) of timer 51.Then, correction circuit 52 infers according to the value of this 200A and 5 minutes the IA that (calculating) should decay to some extent.If the short time, attenuation curve is straight line.If attenuation rate and the correction value of decay per minute 0.4A are pre-stored within to correction circuit 52, can calculate at an easy rate 5 minutes and should decay 2A by correction circuit 52.If the difference of time that contact 4a closing time and operator are pressed to involution button as prerequisite, can make correction circuit 52 carry out more complicated calculating for for a long time.For example, can pre-stored L and R, make correction circuit 52 carry out more complicated calculating, for example, according to the value of above-mentioned L and R and elapsed time of measuring, obtain the decay of electric current.If take, use microcomputer to control as prerequisite, other circuit such as the preferred and memory circuit 50 of correction circuit 52 are integrated and consist of microcomputer.
Then, involution circuit 31 reads in correction value 198A (200-0.4 * 5), and the output IB of power cell 53 is controlled to 198A.Sending the moment that IB is controlled to the instruction of 198A, involution circuit 31 judgement IB reach consistent with IA, involution circuit 31 break contact 4a.
(detecting the processing after voltage collapse)
In above-mentioned whole execution modes, the processing detecting after voltage collapse is as described below.For example, if microcomputer (not shown) detects voltage collapse, the command value that makes electric current is 0, and contact 4a is closed.When contact 4a is closed, electric current is via this contact circulation in superconducting magnet 2, and electric current continues by superconducting coil 2L.Resistance in superconducting magnet 2 is 0, in addition, connecting field power supply and the wire of superconducting magnet 2, the resistance of the contact resistance of contact, splitter 5 etc. is minimum, the consumption ratio of the energy that superconducting magnet 2 is stored is minimum, if the shorter time, the electric current passing through just can not reduce.For example, if abnormality continues 5 minutes, attenuation rate is only about 1%.
Suppose that operator confirms to cause after abnormality because of voltage collapse, press involution button, for example, when the device using under the electric current of 200A decays to IA=198A under short-circuit condition, by involution, process and be adjusted to after IB=198A, break contact 4a switches to after the electric current supply being undertaken by power cell, and involution is to 200A again.Therefore,, to using the operation in magnetic field there is no actual damage, can carry out involution.In addition, also can be accompanied with the wink stopping detecting circuit function that restores electricity and confirm, and utilize the confirmation signal that restores electricity, replace the push of involution button 32.On the other hand, even if carry to have a power failure, with UPS, only control system is backed up, under many circumstances, because power system is in large scale thereby cannot back up, now, allow to control and also cannot make power cell start, therefore, the short circuit of contact 4a is effective.
Above, embodiments of the present invention are illustrated, but the present invention is not limited to above-mentioned execution mode, can in the scope described in claim, carries out various changes.
Claims (3)
1. the field power supply that superconducting magnet is used, carries out excitation to possessing the superconducting magnet of superconducting coil, it is characterized in that, comprising:
Power supply;
Power cell, is connected with described power supply;
Protective device, measures described power supply, described power cell or described superconducting magnet when flase drop and occurs when abnormal, closure make described power cell output two terminal shortcircuits contact and be set as guard mode; And
The 1st current detector, is arranged in the loop that possesses described superconducting coil and described contact, for detection of the current value in this loop,
Wherein, described power cell has:
Amplifier;
The 2nd current detector, detects the output current value of described power cell; And
Current control device, controls described output current value,
The field power supply that described superconducting magnet is used also comprises re-setting device; behind the closed described contact by described protective device; described re-setting device utilizes the detected value of described the 1st current detector and described the 2nd current detector; according to predetermined sweep speed, improve described output current value; make described output current value consistent with the current value passing through in described superconducting coil, thereby disconnect afterwards described contact by described guard mode involution.
2. the field power supply that superconducting magnet as claimed in claim 1 is used, is characterized in that,
Described re-setting device is configured to: when involution button is pressed, read in the detected value of described the 1st current detector as desired value, and using the detected value of described the 2nd current detector as currency, according to predetermined sweep speed, make two detected values consistent, disconnect afterwards described contact.
3. the field power supply that superconducting magnet as claimed in claim 2 is used, is characterized in that,
Described the 1st current detector is arranged on the position that can detect described output current value in described loop,
Described current control device is configured to: in normal condition; utilize the detected value of described the 1st current detector to control described output current value; when by described guard mode involution; utilize the detected value of described the 2nd current detector to control described output current value; during thus, in described normal condition with by described guard mode involution, the current detector of controlling for output current is switched.
Applications Claiming Priority (7)
| Application Number | Priority Date | Filing Date | Title |
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| JP2009-252929 | 2009-11-04 | ||
| JP2009252929 | 2009-11-04 | ||
| JP2010-107484 | 2010-05-07 | ||
| JP2010107484 | 2010-05-07 | ||
| JP2010-214800 | 2010-09-27 | ||
| JP2010214800A JP5129310B2 (en) | 2009-11-04 | 2010-09-27 | Excitation power source for superconducting magnet and its operation method |
| CN201010536637.4A CN102055172B (en) | 2009-11-04 | 2010-11-04 | Excitation source for superconducting magnet and its operating method |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201010536637.4A Division CN102055172B (en) | 2009-11-04 | 2010-11-04 | Excitation source for superconducting magnet and its operating method |
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| JP2014143796A (en) * | 2013-01-22 | 2014-08-07 | Toshiba Corp | Power supply device |
| JPWO2014199793A1 (en) * | 2013-06-13 | 2017-02-23 | 株式会社日立製作所 | Magnetic resonance imaging apparatus and operation method thereof |
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| JPS62279608A (en) * | 1986-05-28 | 1987-12-04 | Toshiba Corp | Split superconducting magnet |
| JP2573725B2 (en) * | 1990-06-07 | 1997-01-22 | 宏七 能登 | Instantaneous power failure protection device using superconducting switch |
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- 2010-09-27 JP JP2010214800A patent/JP5129310B2/en active Active
- 2010-11-04 CN CN201310429751.0A patent/CN103560483B/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4763221A (en) * | 1986-09-09 | 1988-08-09 | Mitsubishi Denki Kabushiki Kaisha | Superconducting magnet apparatus with emergency run down unit |
| JP2004055643A (en) * | 2002-07-17 | 2004-02-19 | Sumitomo Heavy Ind Ltd | Superconducting magnet system |
| CN1956118A (en) * | 2005-10-24 | 2007-05-02 | 深圳安科高技术股份有限公司 | Suporconduction switch controlled by thermomagnetic |
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| Publication number | Publication date |
|---|---|
| JP5518965B2 (en) | 2014-06-11 |
| JP5129310B2 (en) | 2013-01-30 |
| CN103560483B (en) | 2017-09-12 |
| JP2011254694A (en) | 2011-12-15 |
| JP2012257455A (en) | 2012-12-27 |
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