CN103560483B - The field power supply and its operating method of superconducting magnet - Google Patents

Abstract

A kind of field power supply of superconducting magnet is provided.Field power supply（101）Including：Power supply（1）；Power cell（3）；When detecting superconducting magnet（2）Closure makes power cell when generation is abnormal（3）Output two terminal shortcircuits contact（4a）And it is at the protection circuit of guard mode（16）；And the 1st shunt resistance of the current value in measure loop A（5）.Field power supply（101）Also include involution circuit（31）, passing through protection circuit（16）Make protective relay（4）Action is so as to close the contact（4a）Afterwards, the 1st shunt resistance is utilized（5）And the 2nd shunt resistance（8）Detected value, make power cell（3）Output current value and superconducting coil（2L）In the current value that passes through it is consistent, break contact afterwards（4a）So as to by guard mode involution.

Description

The field power supply and its operating method of superconducting magnet

The application is the divisional application of the application for a patent for invention of Application No. " 201010536637.4 ".Application No. The applying date of the patent of invention of " 201010536637.4 " is on November 04th, 2010, and entitled " superconducting magnet is encouraged Magnetoelectricity source and its operating method ".

Technical field

The present invention relates to the field power supply of superconducting magnet and its operating method.

Background technology

Exist in superconducting magnet it is so-called quench phenomenon, i.e.,：Due to superconducting state by destroying, zero resistance is changed into normal Conduction state and the phenomenon for producing voltage, further, since electric current because produce resistance and cataclysm thus by larger superconducting coil It will appear from producing high-tension phenomenon in the superconducting magnet of composition.In addition, whereas if drawing the problem of field power supply itself Play electric current drastically to change, then influenced each other with the above-mentioned generation quenched etc..In field power supply side, power component may be because of high voltage Or lose the huge energy generation adverse current in place to go and damage, on superconducting magnetic side, quenched because of electric current cataclysm, therefore should Superconducting magnet may be damaged.

Therefore, when either one in detecting field power supply and superconducting magnet occurs abnormal, interrelated (connect is cut off Connect) it is appropriate operation.But, huge electric current by when, cut-out (blocking) interrelated (connection) than relatively hazardous.This In, in the technology described in patent document 1, for example, propose the scheme for configuring capacitor side by side to breaker.

Patent document 1：Japanese Patent Application Laid " Unexamined Patent 7-177648 publications "

The content of the invention

But, block the contact being powered as guard method be unsuitable for high current control.In high current control Guard method in, generally, using the terminal shortcircuit of output two of field power supply is made so as to substantially disconnecting the field power supply and super The method of loop.

Here, make field power supply the terminal shortcircuit of output two method in existing defects.If for example, superconducting coil is actually Do not quench but carried out due to flase drop short-circuit (misoperation), will result in the combination of small resistor (R) and superconducting coil (L), store up Depositing the release of energy needs the long period, so as to cause output two ends can not all release short-circuit condition in a long time

In addition, there is the so-called mistake caused by power component is overheated in the exception (problem) occurred as field power supply side Heat anomaly.Sequence controller just in use or microcomputer are when detecting main power voltage rapid drawdown just as interior Portion is abnormal and stops electric current output, but if now making the terminal shortcircuit of output two of field power supply, is then discharged the phase in prolonged LR It is interior equally to release the short-circuit condition of output.Even if in addition, assume voltage dip is solved the problems, such as using UPS, still, by In its BACKUP TIME and scope can be backed up be restricted, i.e. for example, be only capable of being kept for 10 minutes, be only capable of keeping control system without Energy back up power system, therefore, however it remains needs sometime make the terminal shortcircuit of output two of field power supply protect magnet And the problem of be difficult to involution to normal condition.

In addition, for example, during blown fuse inside field power supply, as long as changing its fuse with regard to fuse can be solved Fusing problem.But, as described above, to make and in the absence of the superconducting magnet that quenches by guard mode involution to normal condition then Need the long period.

On the other hand, from the viewpoint of preventing that field power supply and superconducting magnet from damaging, improve to the abnormality such as quenching Detection level be ideal selection.In addition, from the viewpoint for avoiding sequence controller or microcomputer from carrying out misoperation Set out, ideal selection is to improve the detection sensitivity to voltage dip.But, if improving the detection to abnormality Grade, may result in the occurrence frequency (trade-off problem) of increase misoperation.

The present invention is to complete in view of the above problems, and its object is to provide the excitation electricity of such a superconducting magnet Source and its operating method, i.e.,：Even if due to quenching, internal abnormality, the abnormality such as main power voltage rapid drawdown carried out flase drop Survey and cause the output two ends of field power supply to occur short circuit, or, for example have a power failure or change inside field power supply in main power source Exception is there occurs during fuse and needs to handle unusual condition, the measures such as fuse are restored electricity or change by taking And in the case of involution normal condition, afterwards can promptly involution to normal condition (non-shorting state) superconducting magnet Field power supply and its operating method.

To achieve these goals, the present invention provides a kind of superconduction that excitation is carried out to possessing the superconducting magnet of superconducting coil The field power supply of magnet, it is characterised in that including：Power supply；Power cell, is connected with the power supply；Protection device, works as flase drop When measuring the power supply, the power cell or abnormal superconducting magnet generation, closure makes the output of the power cell The contact of two terminal shortcircuits and be set as guard mode；And the 1st current detector, it is arranged on and possesses the superconducting coil and institute State in the loop of contact, for detecting the current value in the loop, wherein, the power cell has：Amplifier；2nd electric current Detector, detects the output current value of the power cell；And current control device, the output current value is controlled, it is described The field power supply of superconducting magnet also includes re-setting device, after the contact is closed by the protection device, the involution Device improves institute using the 1st current detector and the detected value of the 2nd current detector according to predetermined sweep speed Output current value is stated, makes the output current value consistent with the current value passed through in the superconducting coil, described touch is disconnected afterwards Point is so as to by the guard mode involution.

According to said structure, the detected value using above-mentioned 1st current detector and the 2nd current detector makes power cell Break contact after output current value is consistent with the current value passed through in superconducting coil, thus, it is possible to prevent electric current after being disconnected in contact Generation cataclysm.Therefore, it is possible to prevent quenching for superconducting coil.That is, according to the present invention, even if due to carrying out flase drop to abnormality Survey and make the terminal shortcircuit of output two of field power supply, pass through in output current value and superconducting coil that also can be by making power cell Current value it is consistent after break contact so as to promptly involution to normal condition (non-shorting state).

In addition, in accordance with the invention it is possible to promptly involution is to normal condition (non-shorting state), therefore, even if because improving To the occurrence frequency for the detection level of abnormality hair such as quenching and causing to increase misoperation and occur misoperation, involution to just Normal state and does not need the too many time yet.That is, barrier is not resulted in yet to the detection level for the abnormality such as quenching even if improving Hinder and (want involution to normal condition and do not need the too many time), can compare contact the detection level of abnormality by improving Delicately acted, therefore, the destruction to field power supply or superconducting magnet can be better protected from compared to prior art.

In addition, for example, there occurs exception when fuse is changed when main power source has a power failure or inside field power supply and needs pair Unusual condition is handled, and the measures such as fuse are restored electricity or change and in the case of involution normal condition by taking, it After can promptly involution to normal condition (non-shorting state).

In addition, " making the output current value of power cell consistent with the current value passed through in superconducting coil, disconnecting touching afterwards In the description of point ", so-called " consistent " does not imply that completely the same, and referred to substantially uniform.That is, in the output current of power cell There may be a little difference between the current value passed through in value and superconducting coil.As long as making the output current value of power cell and surpassing The current value that the current value passed through in loop unanimously makes it possible in superconducting coil pass through after preventing from disconnecting in contact occurs suddenly The degree for becoming and can preventing the superconducting coil from quenching.In addition, main power source refers to, to the power supply of excitation power supply The power supply of supply electric power (power supply), is the power supply of field power supply upstream side.

In addition, in the present invention, the re-setting device may be configured as：When involution button is pressed, the 1st electricity is read in The detected value of current sensor is as desired value, and using the detected value of the 2nd current detector as currency, according to predetermined Sweep speed makes two detected values consistent, and the contact is disconnected afterwards.

According to said structure, make two detected values consistent according to predetermined sweep speed, thus, by guard mode involution extremely During normal condition, the infringement brought to power cell can be suppressed.

Moreover, the present invention may be configured as：1st current detector, which is arranged in the loop, can detect described defeated Go out the position of current value, the current control device controls institute in normal condition using the detected value of the 1st current detector Output current value is stated, when by guard mode involution, the output current is controlled using the detected value of the 2nd current detector Value, thus, is switched in the normal condition and the involution to the current detector controlled for output current.

Compared to normal condition output current control, by guard mode involution when output current control can use phase To relatively low precision.That is, according to said structure, the 2nd current detector can use the current detector of lower accuracy, so as to Reduce the parts cost of field power supply.

Moreover, the present invention may be configured as：The field power supply has multiple power cells, and possesses：Main control is filled Put, output current command value so that the detected value of the 1st current detector setting output electricity overall with the field power supply Flow valuve is equal；And command value distributor, the current instruction value exported by the main control unit is distributed into each work( Rate unit, wherein, the 1st current detector is the current detector of the overall output current value of the detection field power supply, 2nd current detector is arranged in each power cell, is the current detecting for the output current value for detecting each power cell Device, the current control device for being arranged at each power cell is controlled to the output current value of each power cell so that institute The detected value for stating the 2nd current detector is equal with the current instruction value that the command value distributor is distributed.

According to said structure, generation part lacks in the amplifier in some power cell in multiple power cells Fall into the case of causing the power cell can not discharge stabling current, to send compensate it by main control unit Current instruction value.Also, distribute current instruction value to each power cell by command value distributor.Moreover, each power cell Current control device by being controlled the current-order for making it be distributed with command value distributor to each output current value Value is equal, therefore, and to normal power cell extreme bias current will not occur for electric current, so as to prevent bias current on the whole Phenomenon.

In addition, the present invention may be configured as：1st current detector is arranged on the position with the contact series, and And, the public affairs of the output loop for the power cell being arranged under the contact closure condition and the superconducting coil side loop With part, the detected value of the 1st current detector is set to currency by the re-setting device when involution button is pressed, and And, the desired value of the 1st current detector is set to 0, power cell is controlled according to predetermined sweep speed, makes the described 1st The detected value of current detector and 0 unanimously, disconnects the contact afterwards.

According to said structure, make the detected value of the 1st current detector and 0 consistent according to predetermined sweep speed, thus, By guard mode involution to normal condition when, the infringement brought to power cell can be suppressed.

In addition, in the description of above-mentioned " making the detected value of the 1st current detector and 0 consistent, afterwards break contact ", " one Cause " not only refer to it is 0 completely the same, and refer to approximately reach 0.I.e., it is possible to not be fully achieved 0.As long as examining the 1st electric current The detected value and 0 one for surveying device show the current value generation cataclysm that can prevent passing through after being disconnected in contact in superconducting coil and can The degree for preventing the superconducting coil from quenching.

In addition, the present invention may be configured as：1st current detector is arranged on the position with the contact series, and And, the public affairs of the output loop for the power cell being arranged under the contact closure condition and the superconducting coil side loop With part, the re-setting device is when involution button is pressed by the detected value of the 1st current detector and the 2nd electric current The additive value of the detected value of detector is set to desired value, controls power cell according to predetermined sweep speed, makes the 2nd electric current The detected value of detector is consistent with the desired value, and the contact is disconnected afterwards.Here, it is preferred that implementing the 1st electricity repeatedly successively The addition calculation of the detected value of current sensor and the detected value of the 2nd detector, updates desired value successively.

According to said structure, the control of power part is identical with common scan control thus is easily controlled.In addition, institute here " consistent " said also not only refer to it is completely the same, but including substantially uniform implication.

In addition, according to the second aspect of the invention there is provided a kind of operating method of field power supply, wherein, the excitation Power supply carries out excitation to superconducting magnet, and the field power supply includes：Power supply；Power cell, is connected with the power supply；Protection device, When detecting that the power supply, the power cell or superconducting magnet occur abnormal, closure makes the output of the power cell The contact of two terminal shortcircuits and as guard mode；And the 1st current detector, it is arranged on the superconduction for possessing the superconducting magnet In the loop of coil and the contact, for detecting the current value in the loop, the power cell includes：Amplifier；2nd electricity Current sensor, detects the output current value of the power cell；And current control device, control the output current value, institute Operating method is stated to be characterised by, after the contact is closed by the protection device, using the 1st current detector and The detected value of 2nd current detector makes the output current value consistent with the current value passed through in the superconducting coil, it After disconnect the contact so that by guard mode involution.

In addition, carrying out excitation to possessing the superconducting magnet of superconducting coil there is provided a kind of according to the third aspect of the present invention Superconducting magnet field power supply, it is characterised in that including：Power supply；Power cell, is connected with the power supply；Protection device, When detecting that the power supply, the power cell or the superconducting magnet occur abnormal, closure makes the defeated of the power cell The contact of two terminal shortcircuits gone out and as guard mode；And storage device, the contact is being closed by the protection device Afterwards, output current value of the power cell before closing moment or the closing moment is stored, the power cell tool Have：Amplifier；Current detector, detects the output current value of the power cell；And current control device, control described defeated Go out current value, the field power supply of the superconducting magnet also includes re-setting device, described touch is being closed by the protection device After point, the re-setting device makes the output electricity using the detected value of the current detector and the storage value of the storage device Flow valuve is consistent with the current value passed through in the superconducting coil, and the contact is disconnected afterwards so as to by guard mode involution.

According to said structure, a current detector is used.Originally, if to be controlled by microcomputer Premised on, then calculating and store nearly all can be by the program (software) of microcomputer come correspondence, therefore have and can omit It is used as the advantage of the current detector of hardware component.

In addition, the present invention may be configured as, in addition to：Timer, determines from the storage device and stores the output current Elapsed time from the time of value；And correcting device, the elapsed time determined according to the timer and the list prestored The correction value of position time is modified to the storage value of the storage device, wherein, the re-setting device is passing through the protection Device is closed using the detected value of the current detector behind the contact and described deposited by the correcting device is revised The storage value of storage device, makes the output current value consistent with the current value passed through in the superconducting coil, disconnects afterwards described Contact.

According to said structure, due to not only including storage device, in addition to timer and correcting device, therefore, it is possible to more may be used By ground by guard mode involution.

Moreover, in the invention described above, the contact for more preferably making two terminal shortcircuits of the output of power cell is B contact.Root According to said structure, even in long-time power down mode, also can by the superconducting coil not quenched by guard mode involution to normal State is without quenching phenomenon.

According to the present invention, after above-mentioned contact is closed by protection device, make output current value and the superconduction of power cell The current value passed through in coil is consistent, afterwards break contact, so that by guard mode involution.Thus, even if due to abnormal shape State has carried out error detection or has improved the detection sensitivity of main power voltage rapid drawdown and cause the output two ends of field power supply to be sent out Raw short circuit, afterwards, also can promptly involution to normal condition (non-shorting state).Also, for example, when main power source has a power failure or There occurs exception when fuse is changed inside field power supply and need to handle unusual condition, restored electricity by taking or Change the measure such as fuse and in the case of involution normal condition, afterwards can promptly involution to normal condition (non-shorting shape State).

Brief description of the drawings

Fig. 1 is the structure chart for the field power supply for representing the 1st embodiment of the present invention.

Fig. 2 be represent by guard mode involution when action flow chart.

Fig. 3 is the structure chart for the field power supply for representing the 2nd embodiment of the present invention.

Fig. 4 is the structure chart for the field power supply for representing the 3rd embodiment of the present invention.

Fig. 5 is the structure chart for the field power supply for representing the 4th embodiment of the present invention.

Fig. 6 is the structure chart for the field power supply for representing the 5th embodiment of the present invention.

Fig. 7 is the structure chart for the field power supply for representing the 6th embodiment of the present invention.

Label declaration

1：Power supply

2：Superconducting magnet

2L：Superconducting coil

3：Power cell

4：Protective relay

4a：Contact

5：1st shunt resistance (the 1st current detector)

7：Transistor (amplifier)

8：2nd shunt resistance (the 2nd current detector)

9：Current control circuit (current control device)

16：Protection circuit (protection device)

100：Internal abnormality signal

101：Field power supply

Embodiment

Hereinafter, embodiments of the present invention are illustrated referring to the drawings.

(the 1st embodiment)

Fig. 1 is the structure chart for the field power supply 101 for representing the 1st embodiment of the present invention.

(structure of field power supply 101)

Field power supply 101 is connected with superconducting coil 2L, is for carrying out excitation to possessing superconducting coil 2L superconducting magnet 2 Power supply.Superconducting coil 2L is formed by superconducting wire coiling.

As shown in figure 1, field power supply 101 include power supply 1, power cell 3, the 1st shunt resistance (the 1st current detector) and Protection circuit 16 (protection device).

(power supply)

Power supply 1 includes：The transformer (not shown) that is connected with AC power, will be after the alternating electromotive force rectification of transformer it is flat Sliding DC current is supplied to transistor circuit (not shown) to superconducting coil 2L etc..In addition, in power supply 1, can also use Commercially available switching regulator etc..

(the 1st current detector)

As current detector (the 1st current detector), it can use by Hall element detection as produced by electric current The non-contact type current detector rather than shunt resistance in magnetic field（2nd shunt resistance 8 described later is similarly such）.1st branch electricity The position that resistance 5 is arranged on current value that can be in measure loop A (and is that work(can be detected in the state of break contact 4a Position in the loop A of the output current value of rate unit 3), wherein, above-mentioned loop A includes superconducting coil 2L and protective relay 4 Contact 4a.

(power cell)

Power cell 3 is connected with power supply 1.Power cell 3 includes：(it is usually multiple crystalline substances as the transistor 7 of amplifier Body pipe), still be able under the guard mode state of closure (contact 4a) to detect the 2nd of the output current value of power cell 3 (the current control dress of current control circuit 9 of shunt resistance 8 (the 2nd current detector), the output current value of control power cell 3 Put), the current command circuit 10 (current-order device) to the command current value of current control circuit 9, to current command circuit 10 Indicate the sweep speed setting apparatus 33 of sweep speed, cooperate the involution electricity caused by guard mode involution with current command circuit 10 Road 31 (re-setting device) and the involution button 32 for indicating involution circuit 31 involution (starting involution control).In addition, simultaneously The nonessential building block that sweep speed setting apparatus 33, involution circuit 31 and involution button 32 are regarded as to power cell 3, i.e. The building block of power cell 3 can be considered as being different from.

(amplifier)

Transistor 7 uses common bipolar transistor, it would however also be possible to employ field-effect transistor (FET), IGBT, MOSFET Etc. each power component.On transistor 17 described later, similarly so.

(by the re-setting device of guard mode involution)

Involution circuit 31 is configured to：Cooperated with current control circuit 9, after contact 4a is closed by protection circuit 16 ( When involution is controlled), using the 1st shunt resistance 5 and the detected value of the 2nd shunt resistance 8, make power cell 3 output current value and The current value passed through in superconducting coil 2L is consistent, and break contact 4a is so as to by guard mode (the two of the output of power cell 3 afterwards The state of terminal shortcircuit) involution (being changed into non-shorting state).That is, by protection circuit 16 close contact 4a after, press involution by Button 32, when the output current value of power cell 3 is consistent with the current value passed through in superconducting coil 2L, the 31 pairs of protections of involution circuit Relay 4 sends signal to disconnect the contact 4a.

In addition, it is above-mentioned " make the output current value of power cell 3 consistent with the current value passed through in superconducting coil, it Afterwards in break contact 4a " description, " consistent " and refer not only to completely the same, and refer to substantially uniform.That is, in power cell 3 There may be a little difference between the current value passed through in output current value and superconducting coil 2L.As long as making the defeated of power cell 3 Going out the current value one passed through in current value and superconducting coil 2L and showing can prevent from leading in superconducting coil 2L after contact 4a disconnects Cataclysm and the degree that can prevent the superconducting coil 2L from quenching occur for the current value crossed.

In addition, as in the present embodiment, current control circuit 9 and involution circuit 31 can be not only respectively constituted, and The two can also be formed as to a circuit structure.

Moreover, in the present embodiment, current control device, re-setting device and protection device employ the shape of circuit structure Formula, but it is also possible to carry out programme controlled controller using by microcomputer (microcomputer) etc., and carried out by the controller Control.Now, because program setting has the free degree, therefore setting change is easily carried out.On current command circuit described later 10th, current control circuit (19,29), distributor 14 and main control circuit 12 etc., similarly so.

In addition it is also possible to involution circuit 31 is not incorporated into field power supply 101, and the 1st shunt resistance 5 is only used as electric current Display detector, and be controlled in a manual manner using involution circuit 31 by operator (people).Refer to aftermentioned.

(current-order device)

Current command circuit 10 is configured to：Under normal condition, for example, entering increasing electric current by Operation switch (not shown) During row excitation, to the command current value of current control circuit 9 (that is, output current command value), its basis is set to be set by sweep speed The incrementss that device 33 is determined gradually increase instruction current.Current control circuit 9 is configured to：Based on being exported by current command circuit 10 Current instruction value and the 2nd shunt resistance 8 detected value, control power cell 3 output current value.Here, normal condition is Refer to the state (non-shorting state) that contact 4a disconnects.

In addition, when by guard mode involution, involution circuit 31 is with the detected value (current detection value) of the 1st shunt resistance 5 As desired value, cooperated with current command circuit 10 to the output current value of current control circuit 9.Moreover, involution circuit 31 and electricity Flow control circuit 9 cooperates, and reads in the detected value of the 1st shunt resistance 5 as desired value, makes the desired value and the 2nd shunt resistance 8 After detected value is consistent, break contact 4a (controls the output current value of power cell 3 using the detected value of the 2nd shunt resistance 8.Will The detected value of 1st shunt resistance 5 is used as desired value).Here, guard mode refers to the state (short circuit of contact 4a closures State).Involution refers to the process of enter off-state by closure state.

In addition, generally, when carrying out Current Feedback Control using current splitter, feedback control is carried out to commanded electric current System, therefore, substantially, when instruction is sent, output current will be adjusted in real time as above-mentioned instruction current.In described above In, for ease of understanding, being so that for description is consistent with the detected value of the 2nd shunt resistance 8.In fact, the method specifically used for： If the output valve of current command circuit 10 is consistent with the value of the 1st shunt resistance 5 as desired value, current control circuit 9 2nd shunt resistance 8 and above-mentioned command value are compareed and are adjusted immediately, therefore " detected value of the 2nd shunt resistance 8 " can It is considered " the output order value of current command circuit 10 ".In addition, as initial explanation, actually can also be and utilize The detected values of 2 shunt resistances 8 is confirmed whether consistent method.

In addition, also to protection circuit 16 (protection device) input by having used the controller of the microcomputer (not scheme Show) etc. generation the internal abnormality signal 100 for representing that voltage dip is abnormal, have a power failure etc..

(protective relay)

Protective relay 4 possesses contact 4a.Contact 4a is arranged on the position of two terminal shortcircuits of the output for making power cell 3 Put.In other words, contact 4a is arranged on the position for two terminal shortcircuits for making superconducting coil 2L.The contact 4a of protective relay 4 can be by A Contact is constituted, and can also be made up of B contact.When the contact 4a of protective relay 4 is made up of A contacts, in electric signal ON feelings Condition lower contact 4a is closed, and contact 4a disconnects in the case of electric signal OFF.It is made up of in the contact 4a of protective relay 4 B contact When, contact 4a is closed in the case of electric signal OFF, and contact 4a disconnects in the case of electric signal ON.That is, B contact is that have The electric contact of following feature：When relay (protective relay 4) is not powered, by the recuperability of spring in closure State, when relay (protective relay 4) is powered, by electromagnetic force in the state disconnected.

In addition, if in view of power down mode (state that relay (protective relay 4) is not powered), then protecting relay The contact 4a of device 4 is preferably made up of B contact (normally closed).It is identical with this in embodiment described later.If contact 4a is touched by B Point constitute, then, under power down mode, though involution circuit 31 (re-setting device) because of power failure without action, due to contact 4a closures can still make output two ends be in short-circuit condition.Therefore, the electric current passed through in the superconducting coil 2L not quenched can pass through Contact 4a is flowed back.Afterwards, can be by the action of involution circuit 31 (re-setting device) by protection shape when main power source recovers State involution is to normal condition.On the other hand, in the case where contact 4a is made up of A contacts, if power off time is shorter, involution electricity Road 31 still provides for action, if power off time is longer, and involution circuit 31 causes contact 4a to disconnect with regard to no longer being acted.It is tied Fruit is that the electric current passed through in the superconducting coil 2L not quenched can not realize backflow.

Here, protection circuit 16 is over-voltage detection circuit.Protection circuit 16 is configured to：For example, encouraging as superconducting coil 2L When the setting value of magnetoelectricity pressure is 10V, if excitation voltage is more than 12V, it is judged as overvoltage (exception) and to protective relay 4 And current command circuit 10 sends signal.In addition, protection circuit is varied, however it is not limited to over-voltage detection circuit.

Here, current command circuit 10 is configured to：When receiving the signal for carrying out self-protection circuit 16, to current control electricity Road 9 sends instruction and causes the output current of power cell 3 to be 0.In addition, protective relay 4 is configured to：Carry out self-shield when receiving During the signal of circuit 16, contact 4a is closed.

In the present embodiment, whether superconducting magnet 2 is detected exemplified with protection circuit 16 is incorporated into field power supply 101 There is a situation where exception.Present embodiment can also be configured to：Detection power supply 1 and power cell 3 are incorporated into field power supply 101 With the presence or absence of abnormal circuit (device), in the circuit with quenching detection information, and from the circuit to protective relay 4 and electricity Stream instruction circuit 10 sends signal.Detection power supply 1 and power cell 3 are for example configured to power supply 1 with the presence or absence of abnormal circuit With the abnormal circuit detected such as the overheat of power cell 3, overcurrent, main power voltage rapid drawdown and power failure.

(the guard mode involution control of field power supply)

Below, the involution control to guard mode is illustrated.Fig. 2 be represent by guard mode involution when action stream Cheng Tu.

When protection circuit 16 detects that superconducting magnet 2 occurs abnormal, by protection circuit 16 by passing through protective relay 4 Contact 4a is closed, and makes the output current of power cell 3 be 0 by current control circuit 9.Now, as shown in IA in Fig. 1, surpass The electric current passed through in loop 2L passes through the loop A including superconducting coil 2L and the contact 4a of protective relay 4.On the other hand, The electric current IB passed through from the transistor 7 of power cell 3 is changed into 0.When detecting the exception of power supply 1 and power cell 3, situation with This is identical.

Here, in the case where superconducting coil 2L is quenched, due to superconducting coil 2L be in normal conducting state and There is resistance, thus IA rapid decays.But, the factor such as noise may cause the misoperation of protection circuit 16.In addition, also there is this The situation of kind, i.e.,：Wink pressure occurs in superconducting coil 2L but superconducting state is just reverted to afterwards.In addition, main power source and inapparent electricity Pressure rapid drawdown may also cause protection circuit 16 to be acted.In these cases, because superconducting coil 2L is in the state of superconduction, Therefore loop A resistance is minimum, and electric current IA, which is changed into 0, may need the time of about 1 day.Although electric current can be made by break contact 4a IA is changed into 0, but this operation will cause superconducting coil 2L to quench.The infringement that will be brought to superconducting coil 2L is quenched by force.

Here, in field power supply 101, flow as shown in Figure 2 is controlled like that.When involution button 32 is pressed (S1, the abbreviation of step 1), current command circuit 10 is using the detected value (current value) of the 1st shunt resistance 5 as desired value, to electricity The output current value of flow control circuit 9.The detected value (current value) that current control circuit 9 reads in the 1st shunt resistance 5 is used as desired value (S2).Then, current control circuit 9 regard the desired value of the 1st shunt resistance 5 read in as setting value (S3).In addition, electric current Control circuit 9 by current command circuit 10, read in the value of sweep speed set in advance or from sweep speed setting apparatus The value (S4) of 33 sweep speed.Then, current command circuit 10 is improved to current control circuit 9 according to predetermined sweep speed The current instruction value of output so that the detected value (output current value of power cell 3) of the 2nd shunt resistance 8 is consistent with setting value (S5).S2~S5 is performed repeatedly, untill IA is consistent with IB.Then, when confirming as IA=IB, the 31 pairs of protections of involution circuit Relay 4 sends the signal for disconnecting its contact 4a, and contact 4a disconnects (S6).In addition, on IA=IB, IB may be actually the 2nd The detected value of shunt resistance 8, it is also possible to the current instruction value exported from current command circuit 10 to current control circuit 9.This Outside, in above-mentioned flow, read in the value of the 1st shunt resistance 5 every time in S2, but because processing time is short, decay therebetween Coil current (IA) is minimum, accordingly it is also possible to using the method for performing S3~S6 repeatedly after Exactly-once S2.

(the 2nd embodiment)

Fig. 3 is the structure chart for the field power supply 201 for representing the 2nd embodiment of the present invention.With the difference of the 1st embodiment Part is only that the position of the 1st shunt resistance (the 1st current detector).In the present embodiment, the 1st shunt resistance 5 is set In the position arranged side by side with superconducting coil 2L.So, the 1st shunt resistance 5 is arranged on and the contact 4a of protective relay can be closed The position that the electric current IA passed through after conjunction in superconducting coil 2L is detected.In other words, the 1st shunt resistance 5 be arranged on The position of contact 4a series connection, also, the output loop B for the power cell 3 being arranged under the 4a closure states of contact and described super The loop A of loop 2L sides common part.

In the present embodiment, current control circuit 9 improves the output current of power cell 3 according to predetermined sweep speed Value so that the detected value (current detection value) of the 1st shunt resistance 5 is changed into 0.The detected value of 1st shunt resistance 5 refers to mutually for 0 The IA of reverse flow is consistent with IB.When confirming as IA=IB, current control circuit 9 sends break contact 4a to protective relay 4 Signal, contact 4a disconnect.

In addition, as variation, may be configured as：When involution button 32 is pressed, by the detected value of the 1st shunt resistance 5 Desired value is set to the additive value of the detected value of the 2nd shunt resistance 8, the inspection of the 2nd shunt resistance 8 is made according to predetermined sweep speed Measured value is consistent with the desired value, afterwards break contact 4a.Here, it is preferred that successively repeatedly implement the 1st shunt resistance 5 detected value and The addition calculation of the detected value of 2nd shunt resistance 8, and desired value is updated successively.IA is greater than IB relative to IB reverse flows Electric current, therefore the 1st shunt resistance 5 detected value be " IA-IB ".The detected value of 2nd shunt resistance 8 is " IB ".Therefore, the 1st The additive value of the detected value of the detected value of shunt resistance 5 and the 2nd shunt resistance 8 is " IA ".

As another variation, combine and controlled as follows with above-mentioned control mode, i.e.,：When involution button 32 is pressed When, the detected value for making the 1st shunt resistance 5 and 0 is controlled according to predetermined sweep speed unanimously, also, sweep according to predetermined Retouch the inspection that speed is controlled the detected value and the 2nd shunt resistance 8 of the detected value for making the 2nd shunt resistance 8 and the 1st shunt resistance 5 The additive value of measured value is consistent.Then, stage break contact 4a earlier was controlled such that in following two stages, i.e.,： The detected value of 1st shunt resistance 5 stage consistent with 0；The detected value of 2nd shunt resistance 8 and the detected value of the 1st shunt resistance 5 The stage consistent with the additive value of the detected value of the 2nd shunt resistance 8., can be more promptly according to above-mentioned excitation power supply Involution is to normal condition (non-shorting state).

As described above, according to the present invention, using the 1st shunt resistance 5 and the detected value of the 2nd shunt resistance 8, making power cell 3 output current value is consistent with the current value passed through in superconducting coil 2L, afterwards break contact 4a, is touched thus, it is possible to prevent from disconnecting Cataclysm occurs for electric current after point.Therefore, it is possible to prevent quenching for superconducting coil 2L.That is, according to the present invention, even if due to abnormal shape State carries out error detection and causes the terminal shortcircuit of output two of field power supply (power cell 3), also can be by making the defeated of power cell 3 Going out current value, rear break contact 4a consistent with the current value passed through in superconducting coil 2L is (non-short come promptly involution to normal condition Line state).

In addition, in accordance with the invention it is possible to promptly involution is to normal condition, even if thus, for example, because improving protection circuit 16 abnormal state detection grade and cause the occurrence frequency of misoperation to increase and occur misoperation, involution to normal condition And do not need the too many time.That is, obstacle is not produced to the abnormal state detection grade quenched etc. yet (want involution even if improving To normal condition and do not need the too many time), can make contact 4a to the detection level of abnormality more delicately by improving Acted, therefore, the damage to field power supply (101,201) or superconducting magnet 2 can be better protected from compared to prior art It is bad.It is abnormal on exception, main power voltage rapid drawdown, power failure of generation etc. inside field power supply, it is same.

In addition, in the 1st embodiment, being detected using the electric current to passing through in the superconducting coil 2L in the A of loop 1st shunt resistance 5, and using its detected value as desired value, as variation, may be configured as：In normal state, the 1st is utilized The detected value of shunt resistance 5 controls the output current value of power cell 3, when by guard mode involution, utilizes the 2nd shunt resistance 8 detected value controls the output current value of power cell 3.As described above, the control in field power supply 101 is specially：Just Switch the current detector controlled for output current when normal state and involution.On the other hand, compared to the output of normal condition Current control, by guard mode involution when output current control can use relatively low precision.That is, said structure is excellent Point：2nd shunt resistance 8 under guard mode (state of contact 4a closures), is led to using the current detector of lower accuracy Cross the 1st shunt resistance 5 of degree of precision (can also show to the current detecting that the electric current passed through in superconducting coil 2L carries out higher precision Show).

In addition, in the 1st embodiment, the 2nd shunt resistance 8 is used to implement power cell 3 when normal condition and involution Output current value is controlled, and the 1st shunt resistance 5 can be only used for display.In this case, when by guard mode involution, behaviour The show value of 1st shunt resistance 5 can be set as involution setting value and increase the output current value of power cell 3 by author, When IA is consistent with IB, break contact 4a completes involution.Moreover, in the above description, finally whether confirming IA and IB by operator Unanimously.Then, operator presses the button of break contact 4a in a manual manner.

(the 3rd embodiment)

Fig. 4 is the structure chart for the field power supply 301 for representing the 3rd embodiment of the present invention.Present embodiment and the 1st is implemented Mode difference is essentially consisted in：The field power supply 301 of present embodiment possesses 2 (multiple) power cells.Alternatively, it is also possible to The power cell for making field power supply possess more than 3.

As shown in figure 4, field power supply 301 includes power supply 1, the 1st power cell 13, the 2nd power cell 23, the 1st branch electricity 5 (the 1st current detectors) of resistance, main control circuit 12 (main control unit), distributor 14 (instruction distributor), sweep speed are set Determine device 33, protection circuit 16 (protection device), involution button 32 and involution circuit 131.

(the 1st current detector)

1st shunt resistance 5 is the current detector for the output current value for detecting that field power supply 301 is overall.In addition, the 1st electricity Current sensor is arranged on can detect the loop for the contact 4a for including superconducting coil 2L and protective relay 4 under guard mode The position of output current value (the overall output current value of 2 power cells 12 and 13) in A.

(power cell)

2 power cells 13 and 23 are connected with power supply 1.1st power cell 13 possesses the transistor 17 as amplifier (be usually multiple transistors), the 2nd shunt resistance 18 (the 2nd current detector) of the output current value of detection power cell 13 and Control the current control circuit 19 (current control device) of the output current value of power cell 13.

The structure of 2nd power cell 23 is identical with the 1st power cell 13, and the 2nd power cell 23 possesses as amplifier Transistor 27 (being usually multiple transistors), (the 2nd electric current of the 2nd shunt resistance 28 of the output current value of detection power cell 23 Detector) and control power cell 23 output current value current control circuit 29 (current control device).

Alternatively, it is also possible to by main control circuit 12, distributor 14, switch 30, involution circuit 131, involution button 32 and sweep Retouch the building block (the shared building block of power cell 13 and 23) that speed setting apparatus 33 regards power cell 13 and 23 as.

(main control unit)

Main control unit 12 is used for the output current value for setting and controlling field power supply 301 overall, the main control circuit 12 Set-up function part possess D/A converting circuit (DAC)., will by setting the output current value that field power supply 301 need to be kept Command value, output to the control in main control circuit 12 are used as from the output current value of microcomputer circuit being modeled via DAC Part.

The control section of main control circuit 12 is configured to：To the output current command value of distributor 14 so that the 1st shunt resistance 5 detected value (current value) is equal with the setting output current value that field power supply 301 is overall.Specifically, consist of：Obtain The detected value of 1st shunt resistance 5 and the deviation of setting output current value, the electricity being directly proportional to the output of distributor 14 and gained deviation Flow command value.

(instruction distributor)

Distributor 14 is configured to：By the current instruction value exported by main control circuit 12 be assigned to each power cell (13, 23).In addition, when the current capacity of the 1st power cell 13 and the 2nd power cell 23 is equal, distributor 14 is equably to by leading The current instruction value that control circuit 12 is exported is allocated.The current capacity ratio of 1st power cell 13 and the 2nd power cell 23 is 2：When 3, distributor 14 is with 2：3 ratio is allocated to the current instruction value exported by main control circuit 12.

(on current control circuit 19 and 29)

Here, the current control circuit 19 and 29 for being arranged at each power cell 13 and 23 is configured to：Control each power cell 13 and 23 output current value so that the detected value (current value) of the 2nd shunt resistance 18 and 28 by distributor 14 with being distributed and defeated The current instruction value gone out is equal.

Protective relay 4 is configured to：When receiving the signal for carrying out self-protection circuit 16, contact 4a is closed.In addition, also to Being used for produced by the controller (not shown) of protection circuit 16 (protection device) input as having used microcomputer etc. represents The internal abnormality signal 100 of the unusual conditions such as voltage dip is abnormal, power failure.The letter from involution circuit 131 is received in addition, working as Number when (IA=IB1+IB2 state), the break contact 4a of protective relay 4.

(switch)

Switch 30 be used for the signal from main control circuit 12 and the signal from involution circuit 131 are switched over and incite somebody to action One of them input distributor 14.Switch 30 is started by involution circuit 131.

(action of field power supply)

Below, the action to the normal condition (nonprotected state) of field power supply 301 is illustrated.

(since the 4a closure states of contact, make in non-protected circuit start (contact 4a closure states) or non-involution pattern IA is consistent with IB, is then turned off the sequence of states untill the 4a of contact) normal condition under, the field power supply 301 of present embodiment With prevent or mitigate electric current Biased flow phenomenon function.Here Biased flow phenomenon refers to：The inside of some power cell because Certain reason and when the problems such as generating means is bad or conductor is deteriorated, pass through other normal power cells to producing the work(of problem The output current of rate unit is compensated, so as to cause electric current to other above-mentioned normal power cell bias currents.

As the situation for producing electric current Biased flow phenomenon, for example, due to the cooling device that is set in the 1st power cell 13 (not Diagram) performance reduce and cause the temperature in the 1st power cell 13 to increase, thus compared to other normal 2nd power cells 23, electric current largely flows through the 1st power cell 13.In this case, in order to the excessive electric current passed through in the 1st power cell 13 Compensate, the electric current passed 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 1st The grade element deterioration of transistor 17 in power cell 13 may also cause Biased flow phenomenon.

According to the field power supply 301 of present embodiment, main control circuit 12 is controlled with to the 1st power cell 13 and The output current command value of 2 power cell 23 to export electricity obtained by the voltage produced by the two ends for determining the 1st shunt resistance 5 Flow valuve reaches the output current value of setting in entirety current settings instruction department (not shown), and distributor 14 is to the 1st power cell 13 and the 2nd power cell 23 distributes the current instruction value exported by main control circuit 12.Moreover, (the 2nd work(of the 1st power cell 13 Rate unit 23) current control circuit 19 (current control circuit 29) be controlled so that pass through determine the 2nd shunt resistance 18 The output current value detected by voltage that the two ends of (the 2nd shunt resistance 28) are produced reaches that the electric current distributed by distributor 14 refers to Make value.Thus, the grade element generation part of transistor 17 in the 1st power cell 13 is bad, and occurring the 1st power cell 13 can not In the case of the given electric current of output, the current instruction value compensated to it is sent by main control circuit 12, and pass through distributor 14 pair of the 1st power cell 13 and the 2nd power cell 23 distribution current instruction value.Moreover, the current control electricity of the 1st power cell 13 The current control circuit 29 of the power cell 23 of road 19 and the 2nd is controlled such that the current-order for reaching and being distributed by distributor 14 Value, therefore, will not cause normal 2nd power cell 23 to occur extreme electric current bias current, in this way, it is possible on the whole by electricity Levelling homogenizing is so as to prevent electric current Biased flow phenomenon.

In addition, compared to the magnifying power of main control circuit 12, the amplification of current control electric current 19 and current control circuit 29 Rate is smaller.Therefore, the current control circuit 29 of the power cell 23 of current control circuit 19 and the 2nd of the 1st power cell 13 is allowed In the presence of slight Biased flow phenomenon, and strict current control is carried out by main control circuit 12, entirely through electric current be expected reality Now stabilize.That is, it can prevent field power supply 301 from occurring extreme Biased flow phenomenon on the whole.

In addition, using high-precision resistor compared to the shunt resistance 5 of the 2nd shunt resistance the 18 and 28, the 1st.Thus, it is possible to Reduce the cost of field power supply 301.

In addition, distributor 14 not necessarily uses the structure of present embodiment.As long as can be by overall system control (excitation electricity The current instruction value in source 301 overall (power cell is overall)) it is divided into the current-order of each power cell 13 and 23 to input.

(explanation of guard mode)

In addition, when protection circuit 16 detects to quench in superconducting coil 2L galvanizations, its signal is via protection electricity Road 16 enters main control circuit 12 and current-order is set into 0.Thus, the IB1 and IB2 exported from power component 17 and 27 is changed into 0.At the same time, protection circuit 16 closes contact 4a.Contact 4a is passed through by superconducting coil 2L electric current IA before.Here, When superconducting coil 2L is quenched really, IA sharp-decays.On the other hand, when error detection is quenched, IA does not almost decay, thus Decay needs the long period.

Therefore, when pressing involution button 32, involution circuit 131 is first by the output switching of main control circuit 12 to involution The output of circuit 131.30 contacts that 30b is switched to by 30a will be switched.In the same manner as main control circuit 12, the detected value of electric current Involution circuit 131 is inputted by the 1st shunt resistance 5.Involution circuit 131 using the detected value of the 1st shunt resistance 5 as desired value, and Command value for gradually stepping up current-order is generated according to the value of sweep speed setting apparatus 33 and distributor 14 is outputed it to. In the same manner as normal condition (nonprotected state), 2 power cells of distributor 14 pair (13 and 23) distribution current-order.Work as instruction When electric current reaches desired value IA according to the sweep speed determined by involution circuit 131,2 power cells (13 and 23) distributed Electric current IB1, IB2 aggregate value it is consistent with IA.

As described above, field power supply 301 has the field power supply identical function with the 1st, the 2nd embodiment, i.e.,：Involution Circuit 131 starts, and utilizes the detected value (inspection of the 2nd shunt resistance 18 and 28 of the 1st shunt resistance 5 and the 2nd shunt resistance 18 and 28 The aggregate value of measured value), make the overall output current value of power cell consistent with the current value passed through in superconducting coil 2L, break afterwards Contact 4a is opened, thus prevents that cataclysm occurs for electric current after break contact 4a.

In addition, the difference of involution pattern and normal mode is：In the normal mode, measured by the 1st shunt resistance 5 whole The electric current of body, and being exported to distributor 14 makes it correct the error between overall instruction；In involution pattern, only to distributor The current instruction value that 14 outputs are generated by involution circuit 131.As a result, according to the precision of the 2nd shunt resistance 18 and 28 to IB1 and IB2 is controlled.Here, for example, from the viewpoint of cost cutting, the 2nd shunt resistance 18 and 28 is more overall using precision The low current detector (the low current detector of current detection accuracy) of shunt (the 1st shunt resistance 5).Further, since being double The control system of weight, therefore each unit (power cell 13 and 23) uses relatively low feedback oscillator.Therefore, compared to normal mode Formula, IB1, IB2 are coarse value.(IB1+IB2) ≈ IA, as long as substantially uniform, afterwards just can involution into normal mode, because This, it is allowed to there are some errors.

When IB1+IB2 and IA are substantially uniform, involution circuit 131 transmits current current value IA to main control circuit 12. Then, switch 30 is switched into 30a sides, simultaneously switches off contact 4a.Then, in the normal mode, current control is carried out by electric current Remain setting electric current value IA.In addition, the value that IA can be stored using main control circuit 12 when quenching generation.If using inspection Current value IA is surveyed, when returning to normal mode, is produced between the current value for the superconducting coil 2L for wanting to be controlled originally A little error, therefore, is now finely adjusted by usual way again.

In addition, in the 3rd embodiment, circuit structure is illustrated for point main control circuit 12 and involution circuit 131, Functionally, exist and the current detection value of the 1st shunt resistance 5 is used as feedback signal (main control circuit) and by the 1st branch The current detection value of resistance 5 is used as the difference of desired value (involution circuit), and the output valve of distributor 14 is slightly different, but On circuit structure, the signal input of the 1st shunt resistance 5 is received, the signal of sweep speed setting apparatus 33 is received, generates predetermined sweep Retouch speed current signal these aspect be identical.Generally, these processing are to carry out simulation by microcomputer and D/A converter to turn Exported after changing, therefore, whether (1) has the input of involution button 32, the processing of the detected value of (2) the 1st shunt resistances 5 Difference of content of signal that difference, (3) are exported to distributor etc. is the minute differences of the program of built-in microcomputer, thus excellent Choosing forms as one main control circuit 12 and involution circuit 131.

(the 4th embodiment)

Fig. 5 is the structure chart for the field power supply 401 for representing the 4th embodiment of the present invention.The excitation electricity of present embodiment Source 401 is the variation of the field power supply 301 of the 3rd embodiment.As shown in figure 5, field power supply 401 includes power supply 1, the 1st work( Rate unit 13, the 2nd power cell 23, the 1st shunt resistance 5 (the 1st current detector), main control circuit 12 (main control unit), Distributor 14 (instruction distributor), sweep speed setting apparatus 33, protection circuit 16 (protection device), involution button 32 and involution Circuit 231.

Hereinafter, illustrated to for example closing the involution control after the 4a of contact by protection circuit 16.Pass through the 1st branch electricity Resistance 5 is detected after IA current value, in this, as desired value control (IB1+IB2), when carrying out involution action, by for calculating The adder 304 for going out the aggregate value of the current detection value of the 2nd shunt resistance 18 and the 2nd shunt resistance 28 is obtained (IB1+IB2).By Adder is risen by switch 302 and 303 to the input switching signal of main control circuit 12, to replace the 1st under normal mode The signal of shunt resistance 5.Switch 302 and 303 is acted (switching) according to the signal from involution circuit 231.

When IA is consistent with (IB1+IB2), by the double-throw contact 4a of involution circuit 231 and switch 302 and 303 so as to involution To normal condition (break contact 4a.Switch 302 and 303 switches to 302a and 303a respectively.).When switch 302 and 303 respectively by Normal mode when switching to 302a and 303a, it is involution pattern to be switched to respectively during 302b and 303b.Furthermore, it is also possible to always The detected value of the 1st shunt resistance 5 is inputted to main control circuit 12, to correspond to the IA gradually decayed.

In involution pattern (involution control), due to the current detecting using the 2nd shunt resistance 18 and 28 for preventing bias current The aggregate value of value replaces the 1st shunt resistance 5, therefore, for cost in terms of consideration, the 2nd shunt resistance 18 and 28 can use The current detector of lower accuracy.In this case, the accuracy of detection of electric current is reduced (during involution pattern) only in involution.But It is to be changed into normal mode after involution, starts to be controlled with the 1st shunt resistance 5 (overall shunt), therefore, electricity afterwards Flow control precision involution is normal.The acting as of this involution pattern prevents superconducting coil 2L from there is larger curent change in involution From without making its generation the phenomenon such as quench, the error (error of amperometric determination precision) of above-mentioned degree can't produce larger electricity Rheology, so, in the absence of any problem.

(the 5th embodiment)

Fig. 6 is the structure chart for the field power supply 501 for representing the 5th embodiment of the present invention.The excitation electricity of present embodiment Source 501 eliminates the 1st shunt resistance 5 used in the field power supply 101 of the 1st embodiment, the substitute is storage electricity Road 50 is incorporated into power cell 43.Storage circuit 50 be to by involution circuit 31 close contact 4a back contact 4a closing moments or The storage device that the output current value of power cell 43 before the closing moment is stored.In addition, in the example shown in Fig. 6 In, employ the structure for the detected value that shunt resistance 8 (current detector) is stored by storage circuit 50, it would however also be possible to employ by storing Circuit 50 stores the structure of the current instruction value sent to current control circuit 9.Storage device is varied, except battery back Outside RAM, also Nonvolatile memory devices.In addition, being stored in generally for digitlization via ADC (analog-digital converter) etc. In storage device.

In addition, the involution circuit 31 of present embodiment is configured to such re-setting device, i.e.,：Closed by protection circuit 16 After conjunction contact 4a, make the output current value of power cell 43 using the detected value of shunt resistance 8 and the storage value of storage circuit 50 Consistent with the current value passed through in superconducting coil 2L, break contact 4a is so as to by guard mode involution afterwards.Hereinafter, carry out specific Explanation.

For example, when detecting that superconducting magnet 2 occurs abnormal, protection circuit 16 is almost simultaneously to storage circuit 50, electric current Instruction circuit 10 and protective relay 4 send signal.Output current value of the storage circuit 50 to power cell 43 at the moment enters Row storage.Current command circuit 10 will be set to 0 to the current instruction value that current control circuit 9 is sent, so that power cell 43 It is output as 0.In addition, closing contact 4a by the action of protective relay 4, so that the output short-circuit of power cell 43. In addition, protection circuit 16 is (normal before storage circuit 50 can be reduced to 0 to the contact 4a outputs for closing preceding and power cell 43 State) output current value send signal to storage circuit 50 at the time of stored.

In addition, certainly, when carrying out including the control of abnormality processing by microcomputer or sequence controller, these dresses The signal of built-in wink stopping detecting circuit is difficult to input protection circuit 16 (when detecting the stopping time in wink, to outside carry out state in putting Output, sequence controller itself stop, therefore can not be used afterwards), therefore, separately set wink stopping detecting circuit and should Signal input protection circuit 16, or, for example, microcomputer or sequence controller if being not used in abnormality processing, will The signal input protection circuit 16 of built-in wink stopping detecting circuit in these devices.Moreover, in order that the microcomputer being controlled Calculation machine, sequence controller or other equipment wink stopping detecting circuit detect still to be able in the wink of main power source temporarily (such as 3 after stopping Second or so) function in its power unit, it is necessary to have than generally big electrochemical capacitor, or set and changeable driven for battery Dynamic device, wherein, above-mentioned control includes abnormality processing.

Here, when flase drop measures superconducting magnet 2 and occurs abnormal, electric current IA is made to decay by L and R, but due to L poles Big R is minimum therefore decay very little, such as by only decaying within 5 minutes about 1%.On the other hand, the state if operator notes abnormalities, Then operator presses involution button 32.Thus, involution circuit 31 reads in such as 200A of storage circuit 50 storage value, by power The output IB of unit 43 is controlled in 200A.Send IB is controlled into instruction in 200A at the time of, involution circuit 31 judge IB with IA reaches unanimously, the break contact 4a of involution circuit 31.Even if in fact, IA decays to 198A, if the difference of this degree, no Can cause that superconducting magnet 2 is quenched or field power supply 501 breaks down in itself, and directly by the electric current passed through in magnet adjust to 200A。

According to field power supply 501, a current detector is used.Originally, if miniature calculating will be used in control Machine then due to calculating and storing almost all by the program (software) of microcomputer come correspondence, therefore has as premise The advantage of the current detector as hardware component can be omitted.

(the 6th embodiment)

Fig. 7 is the structure chart for the field power supply for representing the 6th embodiment of the present invention.The field power supply of present embodiment 601 be the variation of the field power supply 501 of the 5th embodiment.In the present embodiment, power cell 53 also includes timer 51 And amendment circuit 52.

Elapsed time from the time of timer 51 is the output current value of the measure storage power unit 53 of storage circuit 50 Timer.In addition, amendment circuit 52 is the correcting device of current value, the current value is used for the process determined according to timer 51 The correction value of time and the unit interval prestored are modified to the storage value of storage circuit 50.

In addition, the involution circuit 31 of present embodiment is configured to：Closed by protection circuit 16 after the 4a of contact, involution circuit 31 using shunt resistance 8 detected value and be corrected the storage value of the revised storage circuit 50 of circuit 52 and make power cell 53 Output current value is consistent with the current value passed through in superconducting coil 2L, afterwards break contact 4a.Hereinafter, it is specifically described.

For example, it is assumed that because exception occurs for error detection superconducting magnet 2 and causes the action of protective relay 4 to close contact 4a Close, operator notes abnormalities state after 5 minutes, operator presses involution button.Now, involution circuit 52 reads in storage circuit 50 Such as 200A storage value, and read in the value in such as 5 minutes (elapsed time of measure) of timer 51.Then, correct Circuit 52 speculates the IA that (calculating) should decay according to the value of 200A and 5 minute.If the short time, then attenuation curve For straight line., can be by correcting electricity if decay 0.4A per minute attenuation rate and correction value are pre-stored within into amendment circuit 52 Road 52 is easily calculated the 2A that should decay for 5 minutes.If contact 4a closing times and operator are pressed into involution button The difference of time is for a long time that, as premise, amendment circuit 52 can be made to carry out more complicated calculating.For example, can prestore L and R, makes amendment circuit 52 carry out more complicated calculating, for example, being obtained according to above-mentioned L and R value and the elapsed time determined The decay of electric current.If premised on being controlled using microcomputer, amendment circuit 52 is preferably with storage circuit 50 etc. Other circuits are integrated and are made up of microcomputer.

Then, involution circuit 31 reads in correction value 198A (200-0.4 × 5), and the output IB controls of power cell 53 are existed 198A.Send IB is controlled into instruction in 198A at the time of, it is consistent that involution circuit 31 judges that IB reaches with IA, involution circuit 31 Break contact 4a.

Field power supply 601 is also equipped with timer 51 and amendment circuit 52, therefore, compared to field power supply 501, more can may be used By ground by guard mode involution.Additionally, it is preferred that setting revertible time restriction in field power supply 501 and field power supply 601. Being preferably set up that revertible time restriction causes in field power supply 501 within such as 10 minutes being capable of involution so that encouraging In magnetoelectricity source 601, although depending on the size of calculation error, but being capable of involution within such as 3 hours.In addition, with the 1st branch electricity The method shown in the field power supply 501,601 of the grade of storage circuit 50 is replaced in resistance 5, is used not only for field power supply 101, Er Qieneng It is enough in field power supply 201,301 and 401.

(detecting the processing after voltage dip)

In above-mentioned whole embodiments, detect that the processing after voltage dip is as described below.If for example, miniature calculating Machine (not shown) detects voltage dip, then the command value for making electric current is 0, and contact 4a is closed.When contact 4a is closed, Electric current circulation in superconducting magnet 2 via the contact, electric current continues through superconducting coil 2L.Resistance in superconducting magnet 2 is 0, It is in addition, minimum in the resistance of connection field power supply and wire, the contact resistance of contact, the shunt 5 of superconducting magnet 2 etc., This consumption ratio for the energy that superconducting magnet 2 is stored is minimum, and if the shorter time, the electric current passed through would not be reduced.Example Such as, if abnormality continues 5 minutes, attenuation rate is only about 1%.

Assuming that operator confirms because of voltage dip to cause after abnormality, involution button is pressed, for example, in 200A electricity When flowing down the device used and decaying to IA=198A in the short-circuit state, adjusted by involution processing to IB=198A, disconnect and touching Point 4a is switched to after the electric current that is carried out by power cell supplies, can again involution to 200A.Therefore, to the operation using magnetic field There is no actual damage, involution can be carried out.Restored electricity the function of confirmation in addition it is also possible to be accompanied with wink stopping detecting circuit, and Using the confirmation signal that restores electricity, to replace the push of involution button 32.On the other hand, have a power failure even if carrying with UPS only Control system is backed up, under many circumstances, because power system is in large scale thus can not back up, now, that is, enabled Can not also power cell be started by being enough controlled, therefore, and contact 4a short circuit is effective.

More than, embodiments of the present invention are illustrated, but the present invention is not limited to above-mentioned embodiment, and can Various changes are carried out in the scope described in claim.

Claims (3)

1. the field power supply of superconducting magnet, excitation is carried out to possessing the superconducting magnet of superconducting coil, it is characterised in that including：

Power supply；

Power cell, is connected with the power supply；

Protection device, when detecting that the superconducting magnet occurs abnormal, closure makes the two ends of the output of the power cell short The contact on road and be set as guard mode；And

1st current detector, is arranged in the loop for possessing the superconducting coil and the contact, for detecting in the loop Current value,

Wherein, the power cell has：

Amplifier；

2nd current detector, detects the output current value of the power cell；And

Current control device, controls the output current value,

The field power supply of the superconducting magnet also includes：

Re-setting device, after the contact is closed by the protection device, the re-setting device is at least with the 1st electric current The detected value of detector, the output current value is improved according to predetermined sweep speed, makes the output current value and described super The current value passed through in loop is consistent, and the contact is disconnected afterwards so as to by the guard mode involution；And

Involution button, for indicating that the re-setting device involution control starts.

2. the field power supply of superconducting magnet as claimed in claim 1, it is characterised in that the re-setting device is configured to：When When the involution button is pressed, the detected value of the 1st current detector is read in as desired value, and by the 2nd electric current The detected value of detector makes two detected values consistent, the contact is disconnected afterwards as currency according to predetermined sweep speed.

3. the field power supply of superconducting magnet as claimed in claim 2, it is characterised in that the 1st current detector is set The position of the output current value can be detected in the loop by putting,

The current control device is configured to：In normal condition, controlled using the detected value of the 1st current detector described defeated Go out current value, when by the guard mode involution, the output current is controlled using the detected value of the 2nd current detector Value, thus, enters in the normal condition and during by the guard mode involution to the current detector controlled for output current Row switching.