CN102055172A - Excitation source for superconducting magnet and its operating method - Google Patents

Excitation source for superconducting magnet and its operating method Download PDF

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Publication number
CN102055172A
CN102055172A CN2010105366374A CN201010536637A CN102055172A CN 102055172 A CN102055172 A CN 102055172A CN 2010105366374 A CN2010105366374 A CN 2010105366374A CN 201010536637 A CN201010536637 A CN 201010536637A CN 102055172 A CN102055172 A CN 102055172A
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value
current
power supply
contact
current detector
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CN102055172B (en
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永浜恭秀
神门刚
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Jastec Co Ltd
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Jastec Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment

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Abstract

Provided is an excitation source for a superconducting magnet, which can quickly return to a normal state (a state of no short circuit) even when the two output ends of the excitation source undergo a short circuit, caused by abnormal situations like an incorrect quench detection, an internal abnormity and a sudden reduction in main power supply voltage, or when power is restored after being cut off. An excitation source (101) comprises a power supply (1), a power unit (3), a protective circuit (16) which will be closed to protect contacts (4a) undergoing short circuit at two output ends of the power unit (3) when an abnormality occurs, and a first shunt resistance (5) detecting the current value in a return circuit A, and a resetting circuit (31). After a protective relay (4) moves, closing the contact (4a) through the protective circuit (16), the resetting circuit (31) is reset from a protective state through disconnecting the contact (4a) by adopting the detection value of the first shunt resistance (5) and a second shunt resistance (8) and making the output current value of the power unit (3) and the current value passing through a superconducting coil (2L) being equal.

Description

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: owing to superconducting state is destroyed, zero resistance becomes the phenomenon that normal conducting state produces voltage, in addition, since electric current because of have a resistance cataclysm thereby in the superconducting magnet that constitutes by bigger superconducting coil, will occur the generation high-tension phenomenon.In addition, otherwise, if because of the problem of field power supply itself causes that electric current sharply changes, then influence each other with generation of above-mentioned quench etc.In the field power supply side, power component may damage because of high voltage or the huge energy generation adverse current that has lost the place to go, and in the superconducting magnet side, because of quench takes place in the electric current cataclysm, so this superconducting magnet may be damaged.
Therefore, the either party in detecting field power supply and superconducting magnet is taken place when unusual, and cutting off interrelated (connection) is appropriate operation.But when huge electric current passed through, it was relatively more dangerous to cut off (blocking) interrelated (connection).Here, in the patent documentation 1 described technology, for example proposed circuit breaker is disposed side by side the scheme of capacitor.
Patent documentation 1: the open communique " spy opens flat 7-177648 communique " of Japan's patent application
Summary of the invention
But, block the such guard method in contact of switching on and be unsuitable for big Current Control.In the guard method of big Current Control, usually, thereby adopt output two terminal shortcircuits that make field power supply substantially to disconnect the method for this field power supply and superconducting coil.
Here, make in the method for output two terminal shortcircuits of field power supply and have defective.For example, if in fact superconducting coil does not have quench owing to 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, all can't remove short-circuit condition thereby cause exporting two ends in long-time
In addition, as unusual (problem) that the field power supply side takes place, existence is crossed heat anomaly because of the overheated what is called that causes of power component.Sequence controller just in use or microcomputer just stop it electric current output as internal abnormality when detecting the main power voltage rapid drawdown, if but made output two terminal shortcircuits of field power supply this moment, the short-circuit condition of output then in long LR interdischarge interval, could be removed equally.In addition; even suppose to use UPS to solve the voltage collapse problem; but; since its BACKUP TIME and can the backup scope being restricted, that is, for example; only can keep 10 minutes; only can the retentive control system and can not back up power system, therefore, still exist and need make output two terminal shortcircuits of field power supply protect magnet and be difficult to the problem of involution sometime to normal condition.
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 the superconducting magnet that does not have quench then 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, the detection level that improves abnormalities such as quench is comparatively desirable selection.In addition, from the viewpoint of avoiding sequence controller or microcomputer to carry out misoperation, comparatively desirable selection is the detection sensitivity that improves voltage collapse.But, if raising to the detection level of abnormality, will cause increasing the occurrence frequency (trade-off problem) of misoperation.
The present invention finishes in view of the above problems, field power supply and method of operation thereof that its purpose is to provide a kind of like this superconducting magnet to use, even that is: because to quench, internal abnormality, abnormalities such as main power voltage rapid drawdown have been carried out the flase drop survey and have been caused the output two ends of field power supply to be short-circuited, perhaps, for example when main power source has a power failure or changes the fuse of field power supply inside, taken place unusual and need unusual condition have been handled, by taking to restore electricity or change measures such as fuse and under the situation of involution normal condition, field power supply and method of operation thereof that involution is promptly afterwards used to the superconducting magnet of normal condition (non-short-circuit condition).
To achieve these goals, the invention provides and a kind of the superconducting magnet that possesses superconducting coil is carried out the field power supply that the superconducting magnet of excitation is used, it is characterized in that, comprising: power supply; Power cell is connected with described power supply; Protective device takes place when unusual when detecting described power supply, described power cell or described superconducting magnet, perhaps detects main power source when having a power failure, closure make described power cell output two terminal shortcircuits the contact and be set at guard mode; And the 1st current detector, be set in the loop that possesses described superconducting coil and described contact, be used to detect 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 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 to make the current value that passes through in described output current value and the described superconducting coil consistent, thereby disconnects described contact afterwards by described guard mode involution.
According to said structure, utilize the current value that passes through in output current value that the detected value of above-mentioned the 1st current detector and the 2nd current detector makes power cell and the superconducting coil consistent after break contact, can prevent to disconnect after-current generation cataclysm thus in the contact.Therefore, can prevent the quench of superconducting coil.Promptly, according to the present invention, even survey output two terminal shortcircuits make field power supply owing to abnormality being carried out flase drop, thus the current value that passes through in output current value that also can be by making power cell and the superconducting coil consistent after break contact involution promptly to normal condition (non-short-circuit condition).
In addition, according to the present invention, involution promptly is to normal condition (non-short-circuit condition), therefore, even cause increasing the occurrence frequency of misoperation and misoperation take place because of improving the detection level that abnormalities such as quench are sent out, involution to normal condition also not need the too many time.Promptly, even the detection level that has improved abnormalities such as quench can not cause obstacle (wanting involution to normal condition not need the too many time) yet, by the detection level that improves abnormality the contact is moved more delicately, therefore, compare to prior art and can prevent destruction better field power supply or superconducting magnet.
In addition, for example, when main power source has a power failure or the inner fuse of field power supply taken place unusual when changing and need unusual condition have been handled, by taking to restore electricity or changing measures such as fuse and under the situation of involution normal condition, involution promptly afterwards is to normal condition (non-short-circuit condition).
In addition, in the description of " current value that passes through in the output current value that makes power cell and the superconducting coil is consistent, afterwards break contact ", so-called " unanimity " is not meant in full accord, and is meant roughly consistent.That is, can there be a little difference between the current value that in the output current value of power cell and superconducting coil, passes through.Make it possible to prevent disconnect current value generation cataclysm of passing through in the superconducting coil of back and the degree that can prevent this superconducting coil generation quench as long as the current value that passes through in the output current value that makes power cell and the superconducting coil is consistent in the contact.In addition, main power source is meant, to the power supply of the power supply supply capability (power supply) that constitutes field power supply, is the power supply of field power supply upstream side.
In addition, in the present invention, described re-setting device can constitute: when the involution button is pressed, the detected value that reads in described the 1st current detector is as desired value, and with the detected value of described the 2nd current detector as currency, make two detected value unanimities according to predetermined sweep speed, disconnect described contact afterwards.
According to said structure, make two detected value unanimities according to predetermined sweep speed, thus, during to normal condition, can suppress the infringement that brings to power cell by the guard mode involution.
And; the present invention can constitute: described the 1st current detector is set at the position that can detect described output current value in the 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; by the guard mode involution time; 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 that is used for output current control is switched.
Compare to the output current control of normal condition, the output current control during by the guard mode involution can be adopted 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 constitute: described field power supply has a plurality of described power cells, and possesses: main control unit, and the output current command value makes the detected value of described the 1st current detector equate with the setting output current value of described field power supply integral body; And command value distributor, to distribute to each power cell by the described current instruction value of described main control unit output, 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, makes the detected value of described the 2nd current detector equate with the current instruction value that described command value distributor is distributed.
According to said structure, even thereby the generation part defective causes this power cell can't discharge under the situation of stabling current in the amplifier in certain power cell in a plurality of power cells, can send the current instruction value that it is compensated by main control unit.And, each power cell is distributed current instruction value by the command value distributor.And, the current control device of each power cell equates by each output current value being controlled the current instruction value that its and instruction value distributor is distributed, therefore, extreme bias current can not take place to normal power cell in electric current, thereby can prevent the bias current phenomenon on the whole.
In addition, the present invention can constitute: described the 1st current detector is set at the position of connecting with described contact, and, be set at the output loop of the described power cell under the described contact closure condition and the common part of described superconducting coil side loop, described re-setting device is made as currency with the detected value of described the 1st current detector when the involution button is pressed, and, the desired value of described the 1st current detector is made as 0, according to predetermined sweep speed power controlling unit, make the detected value of described the 1st current detector consistent, disconnect described contact afterwards with 0.
According to said structure, make the detected value of the 1st current detector consistent according to predetermined sweep speed with 0, thus, during to normal condition, can suppress the infringement that brings to power cell by the guard mode involution.
In addition, in the description of above-mentioned " making the detected value of the 1st current detector consistent with 0, afterwards break contact ", " unanimity " has more than and is meant with 0 in full accord, and is meant and roughly reaches 0.That is, can not reach 0 fully.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 the superconducting coil from also can prevent the degree of this superconducting coil generation quench after the contact disconnects.
In addition, the present invention can constitute: described the 1st current detector is set at the position of connecting with described contact, and, be set at the output loop of the described power cell under the described contact closure condition and the common part of described superconducting coil side loop, described re-setting device is made as desired value with the additive value of the detected value of the detected value of described the 1st current detector and described the 2nd current detector when the involution button is pressed, according to predetermined sweep speed power controlling unit, make the detected value of described the 2nd current detector consistent, disconnect described contact afterwards with this desired value.Here, preferably implement the addition calculation of the detected value of the detected value of described the 1st current detector and described the 2nd detector successively repeatedly, upgrade desired value successively.
According to said structure, the control of power part thereby easy control identical with common scan control.In addition, said here " unanimity " also not only is meant in full accord, but comprises 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 takes place when unusual when detecting described power supply, described power cell or superconducting magnet, closure make described power cell output two terminal shortcircuits the contact and become guard mode; And the 1st current detector, be set in the loop of the superconducting coil that possesses described superconducting magnet and described contact, be used to detect 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 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 the current value that passes through in described output current value and the described superconducting coil consistent; disconnect described contact afterwards, thereby by the guard mode involution.
In addition, according to a third aspect of the present invention, provide a kind of the superconducting magnet that possesses superconducting coil is carried out the field power supply that the superconducting magnet of excitation is used, it is characterized in that, comprising: power supply; Power cell is connected with described power supply; Protective device takes place when unusual detecting described power supply, described power cell or described superconducting magnet, closure make described power cell output two terminal shortcircuits the contact and become guard mode; And storage device, behind the closed described contact by described protective device, in closing moment or should store by the output current value before closing moment, described power cell has: amplifier to described power cell; 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 closed described contact by described protective device; described re-setting device utilizes the storing value of the detected value of described current detector and described storage device to make the current value that passes through in described output current value and the described superconducting coil consistent, thereby disconnects described contact afterwards by the guard mode involution.
According to said structure, use a current detector to get final product.Originally,, then calculated and stored nearly all and can come correspondence, therefore the advantage that can omit as the current detector of hardware component was arranged by the program (software) of microcomputer if to be controlled to be prerequisite by microcomputer.
In addition, the present invention can constitute, and also comprises: timer, measure from the elapsed time in the moment of the described output current value of described memory device stores; And correcting device; the elapsed time of measuring according to described timer and in advance the correction value of the unit interval of storage the storing value of described storage device is revised; 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 the current value that passes through in described output current value and the described superconducting coil consistent, disconnect described contact afterwards.
According to said structure, also comprise timer and correcting device by storage device owing to not only comprising, therefore can be more reliably by the 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 the B contact.According to said structure,, the quench phenomenon can be able to not taken place by the guard mode involution to normal condition in the superconducting coil of quench not even at long-time power down mode yet.
According to the present invention, behind the closed above-mentioned contact by protective device, the current value that passes through in the output current value that makes power cell and the superconducting coil is consistent, break contact afterwards, thereby by the guard mode involution.Thus, even flase drop is surveyed or the detection sensitivity that improved the main power voltage rapid drawdown causes the output two ends of field power supply to be short-circuited owing to abnormality has been carried out, afterwards, also involution promptly is to normal condition (non-short-circuit condition).And, for example, when main power source has a power failure or the inner fuse of field power supply taken place unusual when changing and need unusual condition have been handled, by taking to restore electricity or changing measures such as fuse and under the situation of involution normal condition, involution promptly afterwards is to normal condition (non-short-circuit condition).
Description of drawings
Fig. 1 is the structure chart of the field power supply of expression the 1st execution mode of the present invention.
Fig. 2 is the flow chart of the action when representing by the guard mode involution.
Fig. 3 is the structure chart of the field power supply of expression the 2nd execution mode of the present invention.
Fig. 4 is the structure chart of the field power supply of expression the 3rd execution mode of the present invention.
Fig. 5 is the structure chart of the field power supply of expression the 4th execution mode of the present invention.
Fig. 6 is the structure chart of the field power supply of expression the 5th execution mode of the present invention.
Fig. 7 is the structure chart of the field power supply of expression 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 resistance (the 2nd current detector)
9: current control circuit (current control device)
16: protective circuit (protective device)
100: the 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 is the structure chart of the field power supply 101 of expression the 1st execution mode of the present invention.
(structure of field power supply 101)
Field power supply 101 is connected with superconducting coil 2L, is the power supply that is used for the superconducting magnet 2 that possesses superconducting coil 2L is carried out excitation.Superconducting coil 2L is formed by the superconducting wire coiling.
As shown in Figure 1, field power supply 101 comprises power supply 1, power cell the 3, the 1st shunt resistance (the 1st current detector) and protective circuit 16 (protective device).
(power supply)
Power supply 1 comprises: the transformer that is connected with AC power (not shown), the smooth direct current electric current after the alternating electromotive force rectification of transformer is offered to transistor circuit (not shown) of superconducting coil 2L etc.In addition, in power supply 1, also can use commercially available switching regulator etc.
(the 1st current detector)
As current detector (the 1st current detector), can adopt by Hall element and detect by the non-contact type current detector in the magnetic field that electric current produced but not shunt resistance (the 2nd shunt resistance 8 described later is like this too).The 1st shunt resistance 5 is set at the position that can detect the current value in the A of loop (and be in the loop A of output current value that can detection power unit 3 under the state of break contact 4a position); wherein, above-mentioned loop A comprises the contact 4a of superconducting coil 2L and protection relay 4.
(power cell)
Be connected with power cell 3 on the power supply 1.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 controlling unit 3; current command circuit 10 (current-order device) to current control circuit 9 instruction current values; sweep speed setting apparatus 33 to current command circuit 10 beacon scanning speed; it is feasible by the involution circuit 31 (re-setting device) of guard mode involution and the involution button 32 that is used for involution circuit 31 is indicated involutions (beginning involution control) to cooperate with current command circuit 10.In addition, and nonessentially regard sweep speed setting apparatus 33, involution circuit 31 and involution button 32 building block of power cell 3 as, that is, also it can be regarded as the building block that is different from power cell 3.
(amplifier)
Transistor 7 adopts common bipolar transistor, also can adopt field-effect transistor (FET), each power component such as IGBT, MOSFET.About transistor 17 described later, like this too.
(by the re-setting device of guard mode involution)
Involution circuit 31 constitutes: cooperate with current control circuit 9; after passing through protective circuit 16 closing contact 4a (when involution is controlled); utilize the detected value of the 1st shunt resistance 5 and the 2nd shunt resistance 8; the current value that passes through among the output current value that makes power cell 3 and the superconducting coil 2L is consistent, thereby break contact 4a is by guard mode (states of two terminal shortcircuits of the output of power cell 3) involutions (becoming non-short-circuit condition) afterwards.That is, by behind the protective circuit 16 closing contact 4a, press involution button 32, when the current value that passes through among the output current value of power cell 3 and the superconducting coil 2L was consistent, 31 pairs of protection relays 4 of involution circuit sent signal to disconnect described contact 4a.
In addition, in the description of above-mentioned " current value that passes through in the output current value that makes power cell 3 and the superconducting coil is consistent, afterwards break contact 4a ", " unanimity " also not only refers in full accordly, and is meant roughly consistent.That is, can there be a little difference between the current value that in the output current value of power cell 3 and superconducting coil 2L, passes through.As long as being shown, the current value one that passes through among the output current value of power cell 3 and the superconducting coil 2L can prevent to disconnect the current value generation cataclysm of passing through among the superconducting coil 2L of back and can prevent that this superconducting coil 2L from the degree of quench taking place at contact 4a.
In addition, as present embodiment, not only can constitute current control circuit 9 and involution circuit 31 respectively, and the two can be formed a circuit structure.
And in the present embodiment, current control device, re-setting device and protective device have adopted the form of circuit structure, carry out programme controlled controller but also can adopt by microcomputer (microcomputer) etc., and control by this controller.At this moment, because program setting has the degree of freedom, therefore set change easily.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 the field power supply 101 yet, and only the 1st shunt resistance 5 is used detector as the electric current demonstration, and utilize involution circuit 31 to control with manual mode by operator (people).See aftermentioned for details.
(current-order device)
Current command circuit 10 constitutes: under the normal condition, for example, when carrying out excitation by not shown console switch increase electric current, to current control circuit 9 instruction current values (promptly, the output current command value), make it increase instruction current gradually according to recruitment by 33 decisions of sweep speed setting apparatus.Current control circuit 9 constitutes: based on the current instruction value of being exported by current command circuit 10 and the detected value of the 2nd shunt resistance 8, the output current value of power controlling unit 3.Here, normal condition is meant the state (non-short-circuit condition) that contact 4a disconnects.
In addition, by the guard mode involution time, involution circuit 31, is cooperated to current control circuit 9 output current values with current command circuit 10 as desired value with the detected value (current detection value) of the 1st shunt resistance 5.And, involution circuit 31 is cooperated with current control circuit 9, the detected value that reads in the 1st shunt resistance 5 is as desired value, and after making this desired value and the detected value of the 2nd shunt resistance 8 being consistent, break contact 4a (utilizes the output current value of the detected value power controlling 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 is meant the state (short-circuit condition) of contact 4a closure.Involution is meant the process that is entered off-state by closure state.
In addition, usually, when using current splitter to carry out Current Feedback Control, the electric current that is instructed is carried out FEEDBACK CONTROL, therefore, basically, when instruction was 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 that adopts is: if the output valve of current command circuit 10 is consistent with value as the 1st shunt resistance 5 of desired value, then 9 pairs 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, in fact can also be to utilize the detected value of the 2nd shunt resistance 8 to confirm whether consistent method.
In addition, also to protective circuit 16 (protective device) input by the controller that has used described microcomputer (not shown) wait the expression voltage collapse that produces unusually, the internal abnormality signal 100 of power failure etc.
(protection relay)
Protection relay 4 possesses contact 4a.Contact 4a is set at the position of two terminal shortcircuits of the output that makes power cell 3.In other words, contact 4a is set at the position of two terminal shortcircuits that make superconducting coil 2L.The contact 4a of protection relay 4 can be made of the A contact, also can be made of the B contact.When the contact of protection relay 4 4a is made of the A contact,, disconnect at the situation lower contact 4a of signal of telecommunication OFF in the situation lower contact 4a of signal of telecommunication ON closure.When the contact of protection relay 4 4a is made of the B contact,, disconnect at the situation lower contact 4a of signal of telecommunication ON in the situation lower contact 4a of signal of telecommunication OFF closure.That is, the B contact is the electric contact with following feature: at relay (protection relay 4) when not being powered, the recuperability by spring is in closed state, when being powered, is in the state of disconnection at relay (protection relay 4) by electromagnetic force.
In addition, if consider power down mode (state that relay (protection relay 4) is not powered), then the contact 4a of protection relay 4 preferably is made of B contact (normally closed).In execution mode described later, identical therewith.If contact 4a is made of the B contact, so, under power down mode, even involution circuit 31 (re-setting device) does not move because of power failure, because contact 4a closure still can make the output two ends be in short-circuit condition.Therefore, the electric current that does not pass through among 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 the guard mode involution to normal condition.On the other hand, under the situation that contact 4a is made of the 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 that does not pass through among the superconducting coil 2L of quench can not be realized refluxing.
Here, protective circuit 16 is an over-voltage detection circuit.Protective circuit 16 constitutes: for example, when the set point of the exciting voltage of superconducting coil 2L is 10V, if exciting voltage surpasses 12V, then is judged as overvoltage (unusually) 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 constitutes: when receiving self-protection circuit 16 signal, current control circuit 9 is sent instruction make that the output current of power cell 3 is 0.In addition, protection relay 4 constitutes: when receiving self-protection circuit 16 signal, with contact 4a closure.
In the present embodiment, illustration protective circuit 16 is enrolled detect superconducting magnet 2 in the field power supply 101 and whether have unusual situation.Present embodiment also can constitute: enroll detection power supply 1 and power cell 3 and whether have unusual circuit (device) in field power supply 101; have quench detection information at this circuit, and send signal to protection relay 4 and current command circuit 10 by this circuit.Whether detect power supply 1 and power cell 3 exists unusual circuit for example to constitute the circuit that overheated, overcurrent, main power voltage rapid drawdown and power failure etc. to power supply 1 and power cell 3 detect unusually.
(the guard mode involution control of field power supply)
Below, the involution of guard mode control is described.Fig. 2 is the flow chart of the action when representing by the guard mode involution.
Take place when unusual when protective circuit 16 detects superconducting magnet 2, by by protection relay 4 closing contact 4a, and to make the output current of power cell 3 by current control circuit 9 be 0 by protective circuit 16.At this moment, shown in IA among Fig. 1, the loop A of the contact 4a of the electric current that passes through among the superconducting coil 2L by comprising superconducting coil 2L and protection relay 4.On the other hand, the electric current I B that passes through from the transistor 7 of power cell 3 becomes 0.When detecting power supply 1 and power cell 3 unusual, situation is identical therewith.
Here, take place at superconducting coil 2L have resistance owing to this superconducting coil 2L is in normal conducting state, thereby IA to decay fast under the situation of quench.But factors such as noise may cause protective circuit 16 misoperations.In addition, also there is this situation, that is: takes place among the superconducting coil 2L to press in wink but just revert to superconducting state afterwards.In addition, main power source and inapparent voltage collapse also may cause protective circuit 16 to be moved.In these cases, because superconducting coil 2L is in the state of superconduction, so the resistance of loop A is minimum, and electric current I A becomes 0 may need about 1 day time.Though can make electric current I A become 0 by break contact 4a, this operation will cause superconducting coil 2L quench.The quench infringement that will bring 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 with 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 with the desired value of the 1st shunt resistance 5 that read in 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 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.Carry out S2～S5 repeatedly, until IA with till IB is consistent.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, also may be by the current instruction value of current command circuit 10 to current control circuit 9 outputs.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, and Shuai Jian coil current (IA) is minimum at every turn therebetween, therefore, also can adopt the method for after only carrying out S2, carrying out S3～S6 repeatedly.
(the 2nd execution mode)
Fig. 3 is the structure chart of the field power supply 201 of expression 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 the position arranged side by side with superconducting coil 2L.Like this, the 1st shunt resistance 5 being arranged on the position that can detect the electric current I A that passes through among the superconducting coil 2L after the contact 4a closure of protection relay gets final product.In other words, the 1st shunt resistance 5 is set at the position of connecting with contact 4a, and, be set at the common part of the loop A of the output loop B of the power cell 3 under the 4a closure state of contact and described superconducting coil 2L side.
In the present embodiment, current control circuit 9 makes the detected value (current detection value) of the 1st shunt resistance 5 become 0 according to the output current value of predetermined sweep speed raising power cell 3.The detected value of the 1st shunt resistance 5 is 0 to be meant 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 constitute: 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 desired value, make the detected value of the 2nd shunt resistance 8 consistent according to predetermined sweep speed, afterwards break contact 4a with this desired value.Here, preferably implement the addition calculation of the detected value of the detected value of the 1st shunt resistance 5 and the 2nd shunt resistance 8 successively repeatedly, and desired value is upgraded successively.IA is the electric current greater than IB with respect to the IB reverse flow, 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, carry out following control with above-mentioned control mode combination, that is: when involution button 32 is pressed, it is consistent with 0 to control the detected value that makes the 1st shunt resistance 5 according to predetermined sweep speed, and the additive value of detected value of controlling the detected value of the detected value that makes the 2nd shunt resistance 8 and 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 that makes in following two stages early, that is: in the detected value of the 1st shunt resistance 5 stage consistent with 0; The consistent stage of additive value of the detected value of the detected value of the 2nd shunt resistance 8 and the 1st shunt resistance 5 and the detected value of the 2nd shunt resistance 8.According to above-mentioned formation field power supply, involution more promptly 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, the current value that passes through among the output current value that makes power cell 3 and the superconducting coil 2L is consistent, break contact 4a can prevent break contact after-current generation cataclysm thus afterwards.Therefore, can prevent the quench of superconducting coil 2L.Promptly, according to the present invention, even survey output two terminal shortcircuits cause field power supply (power cell 3) owing to abnormality being carried out flase drop, break contact 4a came involution promptly to normal condition (non-short-circuit condition) after the current value that passes through among output current value that also can be by making power cell 3 and the superconducting coil 2L was consistent.
In addition, according to the present invention, promptly involution is to normal condition; therefore; for example, even, involution to normal condition also not need the too many time because of the abnormal state detection grade that improves protective circuit 16 causes the occurrence frequency of misoperation to increase and misoperation takes place.Promptly, even the abnormal state detection grade that has improved quench etc. does not produce obstacle (wanting involution to normal condition not need the too many time) yet, by the detection level that improves abnormality contact 4a is moved more delicately, therefore, compare to prior art and can prevent damage better field power supply (101,201) or superconducting magnet 2.Unusual, the main power voltage rapid drawdown that takes place about field power supply inside, power failure etc. are unusual, so same.
In addition; in the 1st execution mode; the 1st shunt resistance 5 that use detects the electric current that passes through among the superconducting coil 2L in the A of loop; and with its detected value as desired value; as variation, can constitute: under normal condition, utilize the output current value of the detected value power controlling unit 3 of the 1st shunt resistance 5; by the guard mode involution time, utilize the detected value of the 2nd shunt resistance 8 to come the output current value of power controlling unit 3.As mentioned above, the control in the field power supply 101 is specially: switch the current detector that is used for output current control when normal condition and involution.On the other hand, compare to the output current control of normal condition, the output current control during by the guard mode involution can be adopted relatively low precision.Promptly; 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 can carry out also more that current with high accuracy detects (demonstration) to the electric current that passes through among the superconducting coil 2L.
In addition, in the 1st execution mode, when the 2nd shunt resistance 8 is used for normal condition and involution power cell 3 is implemented output current value control, the 1st shunt resistance 5 can only be used for showing.In this case, by the guard mode involution time, the operator can be set at the show value of the 1st shunt resistance 5 involution with set point and increase the output current value of power cell 3, and break contact 4a finishes involution when IA is consistent with IB.And, in the above description, finally confirm by the operator whether IA is consistent with IB.Then, the operator presses the button with manual mode break contact 4a.
(the 3rd execution mode)
Fig. 4 is the structure chart of the field power supply 301 of expression the 3rd execution mode of the present invention.Present embodiment and the 1st execution mode difference mainly are: the field power supply 301 of present embodiment possesses 2 (a plurality of) power cells.In addition, also can make field power supply possess power cell more than 3.
As shown in Figure 4, field power supply 301 comprises power supply the 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 set at 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)
Be connected with 2 power cells 13 and 23 on the power supply 1.The 1st power cell 13 possesses the current control circuit 19 (current control device) of the output current value of the 2nd shunt resistance 18 (the 2nd current detector) of output current value of transistor 17 (being generally a plurality of transistors) as amplifier, detection power unit 13 and power controlling unit 13.
The structure of the 2nd power cell 23 is identical with the 1st power cell 13, and the 2nd power cell 23 possesses the current control circuit 29 (current control device) of the output current value of the 2nd shunt resistance 28 (the 2nd current detector) of output current value of transistor 27 (being generally a plurality of transistors) as amplifier, detection power unit 23 and power controlling unit 23.
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 power cell 13 and 23.
(main control unit)
Main control unit 12 is used to set and control the output current value of field power supply 301 integral body, and the set-up function of this main control circuit 12 partly possesses D/A converting circuit (DAC).Need the output current value that keeps by setting field power supply 301, will export the control section in the main control circuit 12 to from the output current value of microcomputer circuit simulateding as command value via DAC.
The control section of main control circuit 12 constitutes: to distributor 14 output current command value, make the detected value (current value) of the 1st shunt resistance 5 equate with the setting output current value of field power supply 301 integral body.Particularly, it constitutes: obtain the deviation of the detected value and the setting output current value of the 1st shunt resistance 5, export the current instruction value that is directly proportional with the gained deviation to distributor 14.
(command assignment device)
Distributor 14 constitutes: will be assigned to each power cell (13,23) by the current instruction value of main control circuit 12 outputs.In addition, when the current capacity of the 1st power cell 13 and the 2nd power cell 23 equated, distributor 14 distributed the current instruction value by main control circuit 12 outputs equably.The current capacity ratio of the 1st power cell 13 and the 2nd power cell 23 is 2: 3 o'clock, and distributor 14 distributes the current instruction value by main control circuit 12 outputs with 2: 3 ratio.
(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 constitutes: control the output current value of each power cell 13 and 23, make the detected value (current value) of the 2nd shunt resistance 18 and 28 equate with the current instruction value that is distributed by distributor 14 and export.
Protection relay 4 constitutes: when receiving self-protection circuit 16 signal, and closing contact 4a.In addition, also to protective circuit 16 (protective device) input by the controller that has used microcomputer (not shown) wait being used to of being produced represent voltage collapse unusually, the internal abnormality signal 100 of unusual conditions such as power failure.In addition, when the signal that receives from involution circuit 131 (state of IA=IB1+IB2), protection relay 4 break contact 4a.
(switch)
Switch 30 is used for switching and with one of them input distributor 14 from the signal of 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 (non-guard mode) of field power supply 301 is described.
Start (contact 4a closure state) or non-involution pattern (from contact 4a closure state in non-protective circuit; make IA consistent with IB; serial state till the break contact 4a then) under the normal condition, the field power supply 301 of present embodiment has preventing or alleviates the function of the bias current phenomenon of electric current.The bias current phenomenon here is meant: former thereby production part is bad or during problem such as conductor deterioration because of certain in the inside of certain power cell, compensate by the output current of other normal power cells, thereby cause electric current to above-mentioned other normal power cell bias currents to the power cell that has problems.
As the situation that produces electric current bias current phenomenon, for example, because the performance of the cooling device (not shown) that is provided with in the 1st power cell 13 reduces the temperature that makes in the 1st power cell 13 and rises, thereby compares 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 that passes through in the 1st power cell 13 is compensated, the electric current that passes through in the 2nd power cell 23 is less than the 1st power cell 13 (bias current phenomenon).In addition, for example, because of transistor 17 deteriorations such as element such as grade in the 1st power cell 13 also may cause the bias current phenomenon.
Field power supply 301 according to present embodiment, main control circuit 12 is controlled with the output current value that makes the voltage that produces by the two ends of measuring the 1st shunt resistance 5 get to the 1st power cell 13 and the 2nd power cell 23 output current command value and is reached the whole output current value of setting in electric current setting command portion (not shown), the current instruction value that distributor 14 is exported by main control circuit 12 to the 1st power cell 13 and 23 distribution of the 2nd power cell.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 the detected output current value of voltage that produces by the two ends of measuring the 2nd shunt resistance 18 (the 2nd shunt resistance 28) reach the current instruction value that is 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 takes place can't be exported under the situation of given electric current, send the current instruction value that it is compensated by main control circuit 12, and distribute current instruction value by 14 pairs 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 the feasible current instruction value that is distributed by distributor 14 that reaches, therefore, can not cause normal the 2nd power cell 23 that extreme electric current bias current takes place, like this, thus just can on the whole the electric current equalization be prevented electric current bias current 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 bias current phenomenon, and carry out strict Current Control by main control circuit 12, and the whole electric current that passes through is expected to realize stabilisation.That is, can prevent that extreme bias current 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 employings.Can reduce the cost of field power supply 301 thus.
In addition, the structure of distributor 14 and nonessential employing present embodiment.As long as overall system control (current instruction values of field power supply 301 integral body (power cell integral body)) can be divided into the current-order of each power cell 13 and 23 imports.
(explanation of guard mode)
In addition, when protective circuit 16 detected quench in superconducting coil 2L galvanization, its signal entered main control circuit 12 and current-order is made as 0 via protective circuit 16.Thus, IB1 and the IB2 by power component 17 and 27 outputs becomes 0.Meanwhile, protective circuit 16 is with contact 4a closure.Electric current I A by superconducting coil 2L passes through contact 4a before.Here, when the certain quench of superconducting coil 2L, IA sharply decays.On the other hand, overtime at the flase drop dendrometry, IA is not decay almost, thereby decay needs the long period.
Therefore, when pressing involution button 32, involution circuit 131 at first switches to the output of main control circuit 12 output 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, and generates according to the value of sweep speed setting apparatus 33 and to be used for improving gradually the command value of current-order and to output it to distributor 14 as desired value with the detected value of the 1st shunt resistance 5.With normal condition (non-guard mode) similarly, 14 pairs of 2 power cells of distributor (13 and 23) distribute current-order.When instruction current reached desired value IA according to the sweep speed of being determined by involution circuit 131, the aggregate value of electric current I B1, the IB2 of 2 power cells (13 and 23) that distributed was consistent with IA.
As mentioned above, field power supply 301 has the field power supply identical functions with the 1st, the 2nd execution mode, 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, the current value that passes through among the output current value that makes power cell integral body and the superconducting coil 2L is consistent, 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, record whole electric current by the 1st shunt resistance 5, and export the error that makes between its correction and the whole instruction to distributor 14; In the involution pattern, only to the current instruction value of distributor 14 outputs by 131 generations of involution circuit.The 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 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 be 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 gets final product, as long as roughly consistent, just can involution become normal mode afterwards, therefore, allows to exist some errors.
When IB1+IB2 and IA were roughly consistent, involution circuit 131 transmitted current current value I A to main control circuit 12.Then, switch 30 is switched to the 30a side, simultaneously break contact 4a.Then, under normal mode, carry out Current Control electric current is remained setting 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 wanted originally to produce a little error between the current value of the superconducting coil 2L that controls, therefore, finely tune by usual way this moment 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 with the current detection value of the 1st shunt resistance 5 as feedback signal (main control circuit) with the current detection value of the 1st shunt resistance 5 difference as desired value (involution circuit), and the output valve of distributor 14 is slightly different, but on circuit structure, receive the signal input of the 1st shunt resistance 5, receive the signal of sweep speed setting apparatus 33, these aspects of current signal that generate predetermined sweep speed are identical.Usually, these processing are carried out the laggard line output of analog-converted by microcomputer and DA transducer, therefore, (1) whether there be the difference, (3) of processing of detected value of input, (2) the 1st shunt resistances 5 of involution button 32 to be the minute differences of the program of built-in microcomputer, thereby preferably main control circuit 12 and involution circuit 131 formed as one to the difference of the content of the signal of distributor output etc.
(the 4th execution mode)
Fig. 5 is the structure chart of the field power supply 401 of expression 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 the 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 describing by the control of the involution behind the protective circuit 16 closing contact 4a.After detecting the current value of IA by the 1st shunt resistance 5, control (IB1+IB2) with this as desired value, carrying out involution when action, the adder 304 of the aggregate value of the current detection value by being used to calculate the 2nd shunt resistance 18 and the 2nd shunt resistance 28 is obtained (IB1+IB2).Rise by switch 302 and 303 to main control circuit 12 input switching signals, to replace signal by adder from the 1st shunt resistance 5 under the 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 302a and 303a respectively.)。Normal mode when switch 302 and 303 is switched to 302a and 303a respectively is the involution pattern when being switched to 302b and 303b respectively.And, also can come the corresponding IA of decay gradually always to the detected value of main control circuit 12 inputs the 1st shunt resistance 5.
In involution pattern (involution control), owing to utilize the aggregate value of the current detection value of the 2nd shunt resistance 18 prevent bias current and 28 to replace 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, the only accuracy of detection of (during the involution pattern) electric current reduction when involution.But, after involution, become normal mode, begin to control with the 1st shunt resistance 5 (whole splitter), therefore, Current Control precision involution afterwards is normal.Acting as of this involution pattern prevents that when involution thereby superconducting coil 2L from existing bigger electric current to change and not making it produce phenomenons such as quench, the error of above-mentioned degree (error of amperometric determination precision) can't produce bigger electric current and change, so, do not have any problem.
(the 5th execution mode)
Fig. 6 is the structure chart of the field power supply 501 of expression the 5th execution mode of the present invention.The field power supply 501 of present embodiment has omitted the 1st shunt resistance 5 that uses in the field power supply 101 of the 1st execution mode, the substitute is memory circuit 50 is enrolled in the power cell 43.Memory circuit 50 is storage devices of storing by the output current value of 31 closing contact 4a back contact 4a closing moments of involution circuit or power cell 43 that should be before closing moment.In addition, in example shown in Figure 6, adopted structure, also can adopt by the structure of memory circuit 50 storages to the current instruction value of current control circuit 9 transmissions by the detected value of memory circuit 50 storage shunt resistances 8 (current detector).Storage device is varied, except battery backup RAM, also has Nonvolatile memory devices.In addition, be stored in the storage device via ADC (analog to digital converter) etc. for digitlization usually.
In addition; the involution circuit 31 of present embodiment constitutes such re-setting device; that is: after passing through protective circuit 16 closing contact 4a; utilize the current value that passes through among output current value that the storing value of the detected value of shunt resistance 8 and memory circuit 50 makes power cell 43 and the superconducting coil 2L consistent, thereby break contact 4a is by the guard mode involution afterwards.Below, be specifically described.
For example, take place when unusual when detecting superconducting magnet 2, protective circuit 16 almost sends signals to memory circuit 50, current command circuit 10 and protection relay 4 simultaneously.50 pairs of power cells 43 of memory circuit are stored at the output current value in this moment.Current command circuit 10 will be made as 0 to the current instruction value that current control circuit 9 sends, thereby make power cell 43 be output as 0.In addition, the action by protection relay 4 makes contact 4a closure, 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 the moment that the output current value of (normal condition) before 0 stores and send signals to memory circuit 50.
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 detecting the stopping time in wink; carry out state output to the outside; self stops sequence controller; therefore can't use after); therefore; wink stopping detecting circuit and with this signal input protection circuit 16 is set separately, perhaps, for example; if the microcomputer or the sequence controller of the abnormality processing of being not used in are arranged, with in these devices built-in wink stopping detecting circuit signal input protection circuit 16.And, in order to make microcomputer, sequence controller or other the equipment controlled temporary transient (for example about 3 seconds) performance function still after wink, stopping detecting circuit detected stopping in wink of main power source, need have than common big electrochemical capacitor at its power unit, the changeable battery-driven device that is perhaps is set, wherein, above-mentioned control comprises abnormality processing.
Here, measuring superconducting magnet 2 at flase drop takes place by L and R electric current I A to be decayed, but because the very big R of L is minimum so it is very little to decay, for example only decayed about 1% through 5 minutes when unusual.On the other hand, the state if the operator notes abnormalities, then the 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 at 200A.Sending the moment that IB is controlled at the instruction of 200A, involution circuit 31 judges that IB reaches consistent with IA, involution circuit 31 break contact 4a.In fact, even IA decays to 198A,, can not cause superconducting magnet 2 quench or field power supply 501 itself to break down, and directly the electric current that passes through in the magnet is adjusted to 200A if this degree is poor.
According to field power supply 501, use a current detector to get final product.Originally, if use microcomputer in will controlling, then, therefore had the advantage that to omit as the current detector of hardware component because calculating and storage are almost all next corresponding by the program (software) of microcomputer as prerequisite.
(the 6th execution mode)
Fig. 7 is the structure chart of the field power supply of expression 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.
Timer 51 is timers of measuring the elapsed time that moment of the output current value of memory circuit 50 storage power unit 53 rises.In addition, correction circuit 52 is correcting devices of current value, and this current value is used for the correction value of elapsed time of measuring according to timer 51 and the unit interval of storing in advance the storing value of memory circuit 50 is revised.
In addition; the involution circuit 31 of present embodiment constitutes: behind protective circuit 16 closing contact 4a; the current value that passes through among the output current value that the storing value that involution circuit 31 utilizes the detected value of shunt resistance 8 and is corrected circuit 52 revised memory circuits 50 makes power cell 53 and the superconducting coil 2L is consistent, afterwards break contact 4a.Below, be specifically described.
For example, suppose to survey superconducting magnet 2 and take place to cause unusually protection relay 4 actions to make contact 4a closure owing to flase drop, operator's state that notes abnormalities after 5 minutes, the operator presses the involution button.At this moment, 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 is inferred the IA that (calculating) should decay to some extent according to the value of this 200A and 5 minutes.If the short time, then attenuation curve is a straight line.If decay attenuation rate and the correction value of 0.4A of per minute is stored in correction circuit 52 in advance, can calculate 5 minutes at an easy rate and should decay 2A by correction circuit 52.If the difference of time of contact 4a closing time and operator being pressed the involution button as prerequisite, can make correction circuit 52 carry out more complicated calculating for for a long time.For example, can store L and R in advance, make correction circuit 52 carry out complicated more calculating, for example, obtain the decay of electric current according to value and the elapsed time of being measured of above-mentioned L and R.If to use microcomputer to be controlled to be prerequisite, then preferred the and memory circuit 50 of correction circuit 52 waits other circuit integrated and be made 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 at 198A.Sending the moment that IB is controlled at the instruction of 198A, involution circuit 31 judges that IB reaches consistent with IA, involution circuit 31 break contact 4a.
Field power supply 601 also possesses timer 51 and correction circuit 52, therefore, compares to field power supply 501, can be more reliably by the guard mode involution.In addition, preferably in field power supply 501 and field power supply 601, revertible time restriction is set.Preferably be provided with revertible time restriction for example make in field power supply 501 10 minutes with interior can involution, make in field power supply 601, though depend on the size of the error of calculation, for example 3 hours with interior can involution.In addition, the method with shown in the field power supply 501,601 of the 1st shunt resistance 5 displacement memory circuits 50 grades not only can be used for field power supply 101, and can be used in field power supply 201,301 and 401.
(detect voltage collapse after processing)
In above-mentioned whole execution modes, the processing that detects behind the voltage collapse is as described below.For example, if microcomputer (not shown) detects voltage collapse, the command value that then makes electric current is 0, and with contact 4a closure.When with contact 4a closure, electric current is via this contact circulation in superconducting magnet 2, and electric current continues by superconducting coil 2L.Resistance in the superconducting magnet 2 is 0, in addition, minimum at the resistance of the contact resistance of the lead that connects field power supply and superconducting magnet 2, contact, splitter 5 etc., the consumption ratio of the energy that superconducting magnet 2 is stored is minimum, if be the short time, the electric current that passes through just can not reduce.For example, if abnormality continues 5 minutes, attenuation rate only is about 1%.
Suppose that the operator confirms because of after voltage collapse causes abnormality, press the involution button, for example, when the device that uses under the electric current of 200A decays to IA=198A under short-circuit condition, by involution handle be adjusted to IB=198A after, after break contact 4a switched to the electric current supply that is undertaken by power cell, involution was to 200A once more.Therefore, the operation of using magnetic field is not had actual damage, can carry out involution.In addition, also can attach 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, only control system is backed up with UPS even carry to have a power failure, under many circumstances, because power system is in large scale thereby can't back up, at this moment, promptly allows to control power cell is started, therefore, the short circuit of contact 4a is effective.
More than, embodiments of the present invention are illustrated, but the present invention is not limited to above-mentioned execution mode, can in the described scope of claim, carry out various changes.

Claims (10)

1. the field power supply used of superconducting magnet carries out excitation to the superconducting magnet that possesses superconducting coil, it is characterized in that, comprising:
Power supply;
Power cell is connected with described power supply;
Protective device takes place when unusual when detecting described power supply, described power cell or described superconducting magnet, perhaps detects main power source when having a power failure, closure make described power cell output two terminal shortcircuits the contact and be set at guard mode; And
The 1st current detector is set in the loop that possesses described superconducting coil and described contact, is used to detect 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 is controlled described output current value,
The field power supply that described superconducting magnet is used also comprises re-setting device; behind 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 to make the current value that passes through in described output current value and the described superconducting coil consistent, thereby disconnects described contact afterwards 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 constitutes: when the involution button is pressed, the detected value that reads in described the 1st current detector is as desired value, and with the detected value of described the 2nd current detector as currency, make two detected value unanimities according to predetermined sweep speed, disconnect described contact afterwards.
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 set at the position that can detect described output current value in the described loop,
Described current control device constitutes: in normal condition; utilize the detected value of described the 1st current detector to control described output current value; by described guard mode involution the time; 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 that is used for output current control is switched.
4. the field power supply that superconducting magnet as claimed in claim 3 is used is characterized in that,
Have a plurality of described power cells,
Wherein,
Described the 1st current detector is the current detector that detects the output current value of the field power supply integral body that described superconducting magnet uses,
Described the 2nd current detector is arranged in each power cell, is the current detector that detects the output current value of this each power cell,
The field power supply that described superconducting magnet is used possesses:
Main control unit, output current command value make the setting output current value of the field power supply integral body that detected value and the described superconducting magnet of described the 1st current detector are used equate; And
The command value distributor will be distributed to described each power cell by the described current instruction value of described main control unit output,
The described current control device that is arranged at described each power cell is controlled the output current value of described each power cell, makes the detected value of described the 2nd current detector equate with the current instruction value that described command value distributor distributes.
5. the field power supply that superconducting magnet as claimed in claim 1 is used is characterized in that,
Described the 1st current detector is arranged on the position of connecting with described contact, and is arranged on the output loop of the described power cell under the described contact closure condition and the common part of described superconducting coil side loop,
Described re-setting device constitutes: when the involution button is pressed, the detected value of described the 1st current detector is made as currency, and the desired value of described the 1st current detector is made as 0, make the detected value of described the 1st current detector consistent according to predetermined sweep speed, disconnect described contact afterwards with 0.
6. the field power supply that superconducting magnet as claimed in claim 1 is used is characterized in that,
Described the 1st current detector is arranged on the position of connecting with described contact, and is arranged on the output loop of the described power cell under the described contact closure condition and the common part of described superconducting coil side loop,
Described re-setting device constitutes: when the involution button is pressed, the additive value of the detected value of the detected value of described the 1st current detector and described the 2nd current detector is made as desired value, make the detected value of described the 2nd current detector consistent according to predetermined sweep speed, disconnect described contact afterwards with this desired value.
7. the method for 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 takes place when unusual when detecting described power supply, described power cell or described superconducting magnet, closure make described power cell output two terminal shortcircuits the contact and become guard mode; And the 1st current detector, be arranged in the loop of the superconducting coil that possesses described superconducting magnet and described contact, be used to detect 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 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 the current value that passes through in described output current value and the described superconducting coil consistent; disconnect described contact afterwards, thereby by the guard mode involution.
8. the field power supply used of superconducting magnet carries out excitation to the superconducting magnet that possesses superconducting coil, it is characterized in that, comprising:
Power supply;
Power cell is connected with described power supply;
Protective device takes place when unusual detecting described power supply, described power cell or described superconducting magnet, closure make described power cell output two terminal shortcircuits the contact and become guard mode; And
Storage device, behind closed described contact by described protective device, to described power cell in closing moment or should store by the output current value before closing moment,
Described power cell has:
Amplifier;
Current detector detects the output current value of described power cell; And
Current control device is controlled described output current value,
The field power supply that described superconducting magnet is used also comprises re-setting device; behind closed described contact by described protective device; described re-setting device utilizes the storing value of the detected value of described current detector and described storage device to make the current value that passes through in described output current value and the described superconducting coil consistent, thereby disconnects described contact afterwards by the guard mode involution.
9. the field power supply that superconducting magnet as claimed in claim 8 is used is characterized in that, also comprises:
Timer was measured from the elapsed time in the moment of the described output current value of described memory device stores; And
Correcting device, the elapsed time of measuring according to described timer and in advance the correction value of the unit interval of storage the storing value of described storage device is revised,
Wherein, described re-setting device constitutes: behind the closed described contact by described protective device; utilize the detected value of described current detector and by the storing value of the revised described storage device of described correcting device; make the current value that passes through in described output current value and the described superconducting coil consistent, disconnect described contact afterwards.
10. the field power supply of using as each described superconducting magnet in the claim 1～6,8,9 is characterized in that,
Described contact is the B contact.
CN201010536637.4A 2009-11-04 2010-11-04 Excitation source for superconducting magnet and its operating method Expired - Fee Related CN102055172B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106740993A (en) * 2016-12-14 2017-05-31 太原科技大学 A kind of railway signaling dynamic driving device and its guard method with defencive function
CN110213875A (en) * 2015-05-11 2019-09-06 株式会社荏原制作所 Electromagnet control device, electromagnet, electromagnet control method and electromagnet system
WO2022088922A1 (en) 2020-10-26 2022-05-05 上海交通大学 Pulse charging and magnetization circuit for superconducting magnet

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62279608A (en) * 1986-05-28 1987-12-04 Toshiba Corp Split superconducting magnet
US4763221A (en) * 1986-09-09 1988-08-09 Mitsubishi Denki Kabushiki Kaisha Superconducting magnet apparatus with emergency run down unit
JPH0442728A (en) * 1990-06-07 1992-02-13 Noto Hiroshichi Instantaneous power interruption protective unit employing superconducting switch
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

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62279608A (en) * 1986-05-28 1987-12-04 Toshiba Corp Split superconducting magnet
US4763221A (en) * 1986-09-09 1988-08-09 Mitsubishi Denki Kabushiki Kaisha Superconducting magnet apparatus with emergency run down unit
JPH0442728A (en) * 1990-06-07 1992-02-13 Noto Hiroshichi Instantaneous power interruption protective unit employing superconducting switch
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

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110213875A (en) * 2015-05-11 2019-09-06 株式会社荏原制作所 Electromagnet control device, electromagnet, electromagnet control method and electromagnet system
CN106740993A (en) * 2016-12-14 2017-05-31 太原科技大学 A kind of railway signaling dynamic driving device and its guard method with defencive function
WO2022088922A1 (en) 2020-10-26 2022-05-05 上海交通大学 Pulse charging and magnetization circuit for superconducting magnet
US11871683B2 (en) 2020-10-26 2024-01-09 Shanghai Jiao Tong University Charging and field supplement circuit for superconducting magnets based on pulsed current

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