JP6048955B2 - Power supply for electromagnet - Google Patents

Description

  The present invention relates to an electromagnet power supply device for applying a pulsed large current to an electromagnet used in an accelerator or the like, and more particularly, to a wiring mode for connecting a plurality of units constituting the electromagnet power supply device.

  Accelerators used in fields such as physical chemistry experiments and medicine are equipped with an electromagnet power supply device for applying a pulsed large current to an electromagnet. As a general electromagnet power supply device that has been conventionally used, for example, there is an electromagnet power supply device 1 shown in FIG.

  As shown in the figure, the electromagnet power supply device 1 includes a first output terminal 2 and a second output terminal 3 connected to both ends of the electromagnet 30, and a pulsed first electromagnet from the first output terminal 2 to the electromagnet 30. A first current source 10 for applying a current i1 and a second current source 20 for applying a pulsed second electromagnet current i2 from the second output terminal 3 to the electromagnet 30 are provided. According to the electromagnet power supply device 1, an electromagnet current having a desired polarity can be applied to the electromagnet 30 by operating either the first current source 10 or the second current source 20.

  In addition, as shown in FIG. 2, the electromagnet power supply device 1 maintains the first electromagnet current i1 at the top and the first start-up / fall-down unit 12 responsible for the rise and fall of the first electromagnet current i1. The first sustaining unit 13 and the first current source 10 and the second electromagnet current i2 at the top, and the second electromagnet current i2 at the top. A first current source including a second current source 20 configured with the second maintaining unit 23 to be maintained, or a plurality of first rise / fall units 12a to 12f connected in series as shown in FIG. 10 and a second current source 20 including a plurality of second rise / fall units 22a to 22f connected in series.

  In such an electromagnet power supply device 1, the first startup / falling units 12, 12 a to 12 f and the second startup / falling units 22, 22 a to 22 f have the current shown in FIG. A current source having a configuration shown in FIG. 4B can be used as the first sustaining unit 13 and the second sustaining unit 23. Each of the current sources shown in FIGS. 4A and 4B has been proposed by the applicant in Japanese Patent Application No. 2011-111274.

  By the way, in a power supply device that handles a large current, various problems due to the inadequate wiring routing (current path) through which the large current flows often become a problem. Specifically, when the current path is not appropriate, the inductance of the current path may increase, or noise generated from a strong magnetic field may adversely affect peripheral electric circuits.

  In this regard, Patent Document 1 proposes a power electronics circuit mounting structure in which a forward path and a return path of a large current wiring are arranged next to each other. According to this mounting structure, it is possible to reduce the reactance parasitic on the large current wiring and to reduce noise.

JP 2001-217389 A

  However, there is still no electromagnet power supply device with measures for reducing inductance and noise.

  The present invention has been made in view of the above circumstances, and the problem is that the power supply device for an electromagnet that can reduce the inductance of the wiring through which a large current flows and the noise generated from the wiring can be reduced. Is to provide.

In order to solve the above-described problems, an electromagnet power supply device according to the present invention includes a first output terminal and a second output terminal connected to both ends of an electromagnet, and a pulsed first electromagnet from the first output terminal to the electromagnet. A first current source for applying a current; a second current source for applying a pulsed second electromagnet current from the second output terminal to the electromagnet; and an intermediate wiring interconnecting the first current source and the second current source The first current source includes a first combined startup / shutdown unit in which a plurality of units for starting up and shutting down the first electromagnet current are connected in series; A first sustaining unit for maintaining the first electromagnet current after being raised at the top, and a first wiring for sending the first electromagnet current to the first output terminal, and the second current source is configured to raise the second electromagnet current and Multiple users The second composite rise / fall unit of Tsu bets made in series connection, a second sustain unit maintaining the second electromagnet current after start-up at the top, first sends the second electromagnet current to the second output terminal The first wiring includes a wiring that interconnects a plurality of units constituting the first combined start-up / fall-down unit, a first composite start-up / fall-down unit, and a first maintenance unit. And the second wiring includes a wiring for connecting a plurality of units constituting the second composite startup / shutdown unit to each other, a second composite startup / shutdown unit, and a second maintenance unit. the include wiring and connecting to each other, the first wiring and the second wiring form a loop-shaped current path as a whole, an intermediate wiring connects the first sustain unit and the second sustain unit mutually, Characterized in that it is routed to run parallel with the-loop-like current path.

  In this configuration, when the first electromagnet current flows through the first wiring and the second wiring constituting the loop-shaped current path, the first electromagnet current is passed through the intermediate wiring routed so as to run parallel to the current path. A current of the same size but opposite direction flows. In this configuration, when the second electromagnet current flows through the first wiring and the second wiring, a current having the same magnitude and opposite direction as the second electromagnet current flows through the intermediate wiring. Therefore, according to this configuration, the magnetic field formed around the first wiring and the second wiring is weakened by being canceled by the magnetic field formed around the intermediate wiring, and the first wiring, the second wiring, and the middle Loop inductance caused by wiring can be reduced.

  The intermediate wiring of the electromagnet power supply device is preferably grounded for safety.

In these electromagnet power supply devices , a plurality of units constituting the first combined start-up / fall-down unit on the side of the first maintenance unit so as to sandwich the first maintenance unit and the second maintenance unit arranged adjacent to each other Are arranged in a vertical row, and a plurality of units constituting the second combined start-up / fall-down unit are preferably arranged in a vertical row on the side of the second maintenance unit. According to this configuration, it is easy to run the intermediate wiring side by side with the first wiring and the second wiring, while reducing the installation space (footprint) of the electromagnet power supply device and making it compact.

  ADVANTAGE OF THE INVENTION According to this invention, the power supply apparatus for electromagnets which can reduce the inductance emitted from the wiring from which a large current flows, and the noise emitted from this wiring can be provided.

It is a block diagram which shows the circuit structure of the power supply device for electromagnets. It is a block diagram which shows the circuit structure of the power supply device for electromagnets. It is a block diagram which shows the circuit structure of the power supply device for electromagnets. (A) is a circuit diagram of a 1st and 2nd starting / falling unit, (B) is a circuit diagram of a 1st and 2nd maintenance unit. It is a side surface schematic diagram which shows the installation aspect of the power supply device for electromagnets which concerns on this invention. It is a side surface schematic diagram which shows the installation aspect of the power supply apparatus for electromagnets which concerns on a comparative example.

  Hereinafter, an embodiment of an electromagnet power supply device according to the present invention will be described by dividing it into a circuit configuration and an installation mode with reference to the accompanying drawings.

[Circuit configuration]
The electromagnet power supply device 1 according to an embodiment of the present invention is for applying an electromagnet current having a desired polarity to the electromagnet 30 and has a first output connected to both ends of the electromagnet 30 as shown in FIG. A terminal 2 and a second output terminal 3, a first current source 10 for applying a pulsed first electromagnet current i1 from the first output terminal 2 to the electromagnet 30, and a pulsed first from the second output terminal 3 to the electromagnet 30. And a second current source 20 for applying two electromagnet currents i2.

  The first current source 10 includes a first combined startup / shutdown unit in which six first startup / shutdown units 12 a to 12 f are connected in series, and a first sustaining unit 13. The first start-up / fall-down unit 12a has a PO terminal connected to the first output terminal 2 via the wiring 11a and a NO terminal connected to the PO terminal of the first start-up / fall-down unit 12b via the wiring 11c. It is connected to the. In addition, the NO terminal of the first start-up / fall-down unit 12b is connected to the PO terminal of the first start-up / fall-down unit 12c via the wiring 11c (see FIG. 5). Hereinafter, similarly, the adjacent first start-up / fall-down units are connected to each other by the wiring 11c. In the first sustaining unit 13, the PO terminal is connected to the NO terminal of the first rise / fall unit 12f via the wiring 11b, and the NO terminal constitutes the second current source 20 via the intermediate wiring 4. The second maintenance unit 23 is connected to the PO terminal.

  The wirings 11a, 11b, and 11c correspond to the “first wiring” of the present invention. In the electromagnet power supply device 1 according to the present embodiment, the first electromagnet current i1 is sent to the first output terminal 2 through the first wiring.

  The second current source 20 is configured symmetrically with the first current source 10 with the intermediate wiring 4 interposed therebetween. Specifically, the second current source 20 includes a second combined startup / shutdown unit in which six second startup / shutdown units 22 a to 22 f are connected in series, and a second sustaining unit 23. . The second start-up / fall-down unit 22a has a NO terminal connected to the second output terminal 3 via the wiring 21a and a PO terminal connected to the NO terminal of the second start-up / fall-down unit 22b via the wiring 21c. It is connected to the. In addition, the PO terminal of the second startup / shutdown unit 22b is connected to the NO terminal of the second startup / shutdown unit 22c via the wiring 21c (see FIG. 5). Hereinafter, similarly, the adjacent second rise / fall units are connected to each other by the wiring 21c. In the second maintenance unit 23, the NO terminal is connected to the PO terminal of the second rise / fall unit 22f via the wiring 21b, and the PO terminal constitutes the first current source 10 via the intermediate wiring 4. It is connected to the NO terminal of the first maintenance unit 13.

  The wirings 21a, 21b and 21c correspond to the “second wiring” of the present invention. In the electromagnet power supply device 1 according to the present embodiment, the second electromagnet current i2 is sent to the second output terminal 3 through the second wiring.

  As shown in FIG. 3, the intermediate wiring 4 is grounded.

  In the electromagnet power supply device 1 according to the present embodiment, current sources shown in FIG. 4A are used as the first startup / falling units 12a to 12f and the second startup / falling units 22a to 22f. Yes. The current source includes a first charging power source E1 that outputs a first voltage (for example, several thousand volts), a first capacitor C1 that is charged with the first voltage, and four switching elements SW1 to SW4 that are H-bridge connected. And.

  The switching elements SW1 to SW4 constitute a bridge circuit unit, and a connection point between the first switching element SW1 and the second switching element SW2 is a PO terminal, and a connection point between the third switching element SW3 and the fourth switching element SW4 is a NO terminal. ing. The bridge circuit unit is connected in parallel to the first capacitor C1.

  The switching elements SW1 to SW4 are power semiconductor elements such as IGBTs (Insulated Gate Bipolar Transistors). Gates which are control terminals of the switching elements SW1 to SW4 are connected to a control unit (not shown), and the switching elements SW1 to SW4 are turned on or off under the control of the control unit.

  The current source serving as the first start-up / fall-down units 12a to 12f discharges the first capacitor C1 that has been charged to several thousand volts in advance through the first switching element SW1 that is turned on, thereby causing the PO terminal The discharge current of the first capacitor C1 is output from the first, thereby causing the first electromagnet current i1 to rise to the top at once. Further, the current source that becomes the first rise / fall units 12a to 12f causes the first capacitor C1 to regenerate the current flowing from the NO terminal, thereby causing the first electromagnet current i1 to fall at once from the top.

  The current source serving as the second start-up / fall-down units 22a to 22f is configured to discharge the first capacitor C1, which has been charged to several thousand volts in advance, through the third switching element SW3 that is turned on, so that the NO terminal The discharge current of the first capacitor C1 is output from the first, and thereby the second electromagnet current i2 is raised to the top at once. Further, the current source that becomes the second rise / fall units 22a to 22f causes the first capacitor C1 to regenerate the current that has flowed from the PO terminal, thereby causing the second electromagnet current i2 to fall from the top at once.

  In the electromagnet power supply device 1 according to the present embodiment, the current source shown in FIG. 4B is used as the first maintenance unit 13 and the second maintenance unit 23. The current source includes a second charging power source E1 that outputs a second voltage (for example, hundreds of volts), a second capacitor C2 that is charged with the second voltage, and a third voltage that is lower than the second voltage (for example, , 100V), a third capacitor C3 charged with a third voltage, a rectifier element D connected in series to the third capacitor C3, and four switching elements SW5 connected in H-bridge To SW8.

  The switching elements SW5 to SW8 constitute a bridge circuit unit, and the connection point between the fifth switching element SW5 and the sixth switching element SW6 is the PO terminal, and the connection point between the seventh switching element SW7 and the eighth switching element SW8 is the NO terminal. ing. The bridge circuit unit is connected in parallel to the second capacitor C2 and a series circuit of the third capacitor C3 and the rectifying element D.

  Similar to the switching elements SW1 to SW4, the switching elements SW5 to SW8 are power semiconductor elements such as IGBTs. Gates that are control terminals of the switching elements SW5 to SW8 are connected to a control unit (not shown), and the switching elements SW5 to SW8 are turned on or off under the control of the control unit.

  The current source serving as the first sustaining unit 13 discharges the second capacitor C2 that has been charged to a few tens of volts in advance through the fifth switching element SW5 after the first electromagnet current i1 is raised to the top. Thereafter, the third capacitor C3, which has been charged to about 100V in advance, is discharged through the fifth switching element SW5, so that the discharge currents of the second capacitor C2 and the third capacitor C3 are output from the PO terminal. One electromagnet current i1 is maintained at the top.

  The current source serving as the second sustaining unit 23 discharges the second capacitor C2 that has been charged to hundreds of tens of volts in advance through the seventh switching element SW7 after the second electromagnet current i2 is raised to the top. After that, the third capacitor C3, which has been charged to about 100V in advance, is discharged through the seventh switching element SW7, so that the discharge currents of the second capacitor C2 and the third capacitor C3 are output from the NO terminal. A 2 electromagnet current i2 is maintained at the top.

[Installation mode]
As shown in FIG. 5, in the electromagnet power supply device 1 according to this embodiment, the first current source 10 and the second current source 20 are arranged symmetrically. More specifically, the first current source 10 is configured such that the first sustaining unit 13 that constitutes the first current source 10 and the second sustaining unit 23 that constitutes the second current source 20 are disposed adjacent to each other. A plurality of first rise / fall units 12a to 12f and a plurality of second rise / fall units 22a to 22f constituting the second current source 20 are respectively arranged in a vertical row (stacked in a vertical direction). Yes. The first startup / falling units 12a to 12f and the second startup / falling units 22a to 22f are accommodated in a rack (not shown).

  The first wiring 11 (wirings 11a, 11b, 11c) that connects the PO terminal, the NO terminal, and the first output terminal 2 of each unit included in the first current source 10 is made of a metal plate (for example, a copper plate), It is routed so that the length is the shortest. The second wiring 21 (wirings 21a, 21b, 21c) that connects the PO terminal, the NO terminal, and the second output terminal 3 of each unit included in the second current source 20 is also made of a metal plate and has a length. It is routed to be the shortest. Thereby, the first wiring 11 and the second wiring 21 form a loop-shaped current path as a whole.

  On the other hand, the intermediate wiring 4 does not connect the NO terminal of the first sustaining unit 13 and the PO terminal of the second sustaining unit 23 in the shortest time, but is arranged in parallel with a loop-shaped current path composed of the first wiring 11 and the second wiring 21. It is drawn to run. As a result, the intermediate wiring 4 also forms a loop-shaped current path. That is, the electromagnet power supply device 1 according to the present embodiment includes an outer current path composed of the first wiring 11 and the second wiring 21 and an inner current composed of the intermediate wiring 4 wired adjacent to the current path. There is a road. As a result, the area S of the loop surrounded by the first wiring 11 (wirings 11a, 11b, 11c), the second wiring 21 (wirings 21a, 21b, 21c) and the intermediate wiring 4 (the hatched portion in the figure) is reduced. In addition, the loop inductance can be reduced.

  When the first current source 10 applies the first electromagnet current i1 to the electromagnet 30, that is, when the first electromagnet current i1 flows counterclockwise through the current path composed of the first wiring 11 and the second wiring 21. In the intermediate wiring 4, a current having the same magnitude as the first electromagnet current i1 flows clockwise. On the other hand, when the second current source 20 applied the second electromagnet current i2 to the electromagnet 30, that is, the second electromagnet current i2 flowed clockwise in the current path composed of the first wiring 11 and the second wiring 21. In this case, a current having the same magnitude as the second electromagnet current i2 flows through the intermediate wiring 4 counterclockwise.

  That is, in the electromagnet power supply device 1 according to the present embodiment, when a current flows in one of two current paths that run in parallel, a current of the same magnitude always flows in the opposite direction in the other current path. For this reason, according to the electromagnet power supply device 1, the magnetic field formed around the first wiring 11 and the second wiring 21 is offset by the magnetic field formed around the intermediate wiring 4, and noise that adversely affects the surroundings is generated. Generation | occurrence | production can be reduced and the loop inductance resulting from the 1st wiring 11, the 2nd wiring 21, and the intermediate wiring 4 can be reduced.

  When the intermediate wiring 4 is routed so as to have the shortest length, a current path that runs parallel to the current path including the first wiring 11 and the second wiring 21 is not formed as shown in FIG. For this reason, the area S ′ of the loop surrounded by the first wiring 11 (wirings 11a, 11b, and 11c), the second wiring 21 (wirings 21a, 21b, and 21c), and the intermediate wiring 4 (the hatched portion in the figure). As a result, the loop inductance increases. Therefore, in this case, noise cannot be reduced or inductance cannot be reduced.

  As mentioned above, although one Embodiment of the power supply device for electromagnets concerning this invention was described, this invention is not limited to the said embodiment.

  For example, the first current source 10 according to the present invention is not limited to one including a plurality of first start / stop units 12 a to 12 f and one first sustain unit 13, and is pulsed with respect to the electromagnet 30. Any current source capable of applying the first electromagnet current i1 can be used. The same applies to the second current source 20.

  Further, the routing of the first wiring 11, the second wiring 21, and the intermediate wiring 4 is not limited to the mode shown in FIG. 5 and can be changed as appropriate. However, in the present invention, it is necessary that the first wiring 11 and the second wiring 21 form a loop-shaped current path as a whole, and the intermediate wiring 4 runs parallel to the current path.

  Further, the intermediate wiring 4 may not be grounded. However, when the intermediate wiring 4 is not grounded, it is necessary to consider that the operator does not get an electric shock by covering the intermediate wiring 4 with an appropriate insulating material.

DESCRIPTION OF SYMBOLS 1 Electromagnet power supply device 2 1st output terminal 3 2nd output terminal 4 Intermediate wiring 10 1st current source 11 1st wiring 12, 12a-12f 1st rise / fall unit 13 1st maintenance unit 20 2nd current source 21 2nd wiring 22, 22a-22f 2nd starting / falling unit 23 2nd maintenance unit 30 Electromagnet

Claims (3)

A first output terminal and a second output terminal connected to both ends of the electromagnet, a first current source for applying a first electromagnet current pulsed in the electromagnet from the first output terminal, said second output terminal An electromagnet power supply device comprising: a second current source that applies a pulsed second electromagnet current to the electromagnet; and an intermediate wiring that interconnects the first current source and the second current source,
The first current source includes a first combined startup / shutdown unit formed by connecting a plurality of units that start and stop the first electromagnet current in series, and the first electromagnet current after startup. A first maintenance unit for maintaining at the top, and a first wiring for sending the first electromagnet current to the first output terminal;
The second current source includes a second combined startup / shutdown unit formed by connecting a plurality of units that start and stop the second electromagnet current in series, and the second electromagnet current after startup. A second maintenance unit for maintaining at the top, and a second wiring for sending the second electromagnet current to the second output terminal;
The first wiring interconnects a plurality of units constituting the first combined startup / shutdown unit, and connects the first composite startup / shutdown unit and the first maintenance unit to each other. Including wiring to
The second wiring interconnects a plurality of units constituting the second composite startup / shutdown unit, and connects the second composite startup / shutdown unit and the second maintenance unit to each other. Including wiring to
The first wiring and the second wiring form a loop-shaped current path as a whole,
The intermediate wiring is routed so as to connect the first maintenance unit and the second maintenance unit to each other and run in parallel with the loop-shaped current path.
A power supply device for an electromagnet.   The electromagnet power supply device according to claim 1, wherein the intermediate wiring is grounded. A plurality of units constituting the first combined start-up / fall-down unit are arranged in a vertical row on the side of the first maintenance unit so as to sandwich the first maintenance unit and the second maintenance unit arranged adjacent to each other. are, according to claim 1 or claim 2, wherein a plurality of units constituting the second composite rise / fall unit on a side of the second sustain unit is arranged in tandem Electromagnet power supply.

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