JP2010092910A - Circuit with capacitor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stop a capacitor from functioning before the capacitor is broken, a pressure valve operates, etc. <P>SOLUTION: Circuits 1, 10 with a capacitor each include a fuse 3 connected in series with a power source 2 for supplying electric power, a capacitor 7 having anode-side and cathode-side terminals 14 (14a, 14b), and a switch 5 connected to the capacitor 7 in parallel and forming a short circuit for stopping the capacitor 7 from functioning on detecting a replacement period of the capacitor 7. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a circuit with a capacitor.

  Among conventional capacitors, a capacitor element obtained by winding a separator with a separator as a separator between two electrode foils (cathode foil and anode foil) is housed in a case Exists. In such a capacitor, the airtightness inside the case is improved so that the electrolytic solution constituting the capacitor element does not leak out of the case. However, if the capacitor is used for a long period of time, gas is generated due to decomposition of the internal electrolyte, etc., and the inside of the case becomes an abnormally high pressure, and the capacitor may burst.

  Therefore, a thin portion may be provided on the case surface as a pressure valve. The thin-walled portion is lower in strength than the other portions. Therefore, if the inside of the case reaches a certain pressure or higher, it is destroyed first. Therefore, the momentum of bursting when the capacitor bursts can be reduced (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 10-22180 (claims, etc.)

  In the capacitor of the type described in Patent Document 1, the pressure valve is destroyed before the inside of the case reaches an abnormally high pressure, and vaporized electrolyte or the like is released from that portion. However, when the pressure valve is operated in this way, mist of the electrolytic solution is generated. The user misunderstands this mist as smoke caused by combustion, and reports it to the fire department or the like as ignition.

  Therefore, an object of the present invention is to provide a circuit with a capacitor that can stop the function of the capacitor before the capacitor is destroyed or the pressure valve is activated.

  In order to achieve this object, one aspect of a circuit with a capacitor according to the present invention includes a fuse connected in series to a power supply for supplying power, a capacitor having terminals on the anode side and the cathode side, a capacitor, A switch that is connected in parallel and that forms a short-circuit path that detects the replacement time of the capacitor and stops the function of the capacitor.

  The capacitor includes a capacitor element, a case having an opening for accommodating the capacitor element, and a sealing plug for sealing the opening of the case, and the sealing plug increases an internal pressure of the capacitor. The switch is preferably deformed or displaced, and the switch preferably forms a short circuit path by deformation or displacement of the sealing plug.

  In addition, it has a conductor disposed away from at least one of the anode side terminal and the cathode side terminal, and the sealing plug is deformed or displaced so that the conductor is connected to the anode side terminal and the cathode side. Are preferably electrically connected to each other to form a short circuit of the switch.

  Further, the capacitor and the switch are preferably one component as a detection capacitor.

  According to the present invention, the function of the capacitor can be stopped before the capacitor is destroyed or the pressure valve is operated.

  Hereinafter, an embodiment of a circuit with a capacitor according to the present invention will be described with reference to the drawings. FIG. 1 is a circuit diagram showing a configuration of a circuit 1 with a capacitor according to an embodiment of the present invention.

  The circuit with a capacitor 1 includes a power source 2, a fuse 3, a rectifying element 4, a switch 5, an operation unit 6, and a capacitor 7. The switch 5 and the capacitor 7 are collectively referred to as a capacitor circuit 8.

  In the present embodiment, the power source 2 is an AC power source that supplies power. The supplied alternating current is converted into direct current by the rectifying element 4. Note that a DC power supply may be used instead of the AC power supply. In that case, the rectifying element 4 may be omitted.

  The fuse 3 is a device that cuts a circuit when a current higher than the rated current flows. In addition, since the fuse 3 is connected in series to the power supply 2, when the fuse 3 is opened, both the current flowing through the operating unit 6 and the capacitor 7 are cut off. As the fuse 3, for example, a tubular fuse having a structure in which a thin metal wire made of a material soluble at high temperature is stretched in a hollow body can be used. When such a fuse 3 is placed in an electric circuit, a fine metal wire usually behaves as a conductor. However, when a current exceeding the allowable current flows in the electric circuit due to some abnormality, a large Joule heat is generated in the thin metal wire. Then, the fine metal wire is melted by the Joule heat. As a result, the entire circuit is disconnected.

  The rectifying element 4 functions as a so-called AC / DC converter that converts alternating current into direct current. The rectifying element 4 is composed of, for example, a diode bridge circuit. The diode bridge circuit is a bridge connection of four diodes. Therefore, the AC voltage input to the diode bridge circuit is output as a rectified DC voltage. A circuit composed of the power supply 2 and the fuse 3 is connected to the input side of the diode bridge circuit. On the other hand, a circuit mainly composed of the switch 5, the operation unit 6, and the capacitor 7 is connected to the output side of the diode bridge circuit.

  The switch 5 is connected in parallel with the capacitor 7. Further, the switch 5 is in an OFF state, that is, a state in which no current flows through the switch 5 while the capacitor 7 is operating normally. On the other hand, when the replacement time of the capacitor 7 is detected, an ON state, that is, a short circuit that forms a side path through which a current flows through the switch 5 is formed. The trigger for switching the switch 5 ON or OFF may be a mechanical object or an electrical signal.

  The operation unit 6 is a load that consumes electric energy, and is a device that is operated by the power supply 2. The operating unit 6 is connected in parallel to the capacitor 7 and the switch 5. Therefore, the direct current supplied through the rectifying element 4 is further smoothed by the capacitor 7 and supplied to the operating unit 6.

  The capacitor 7 is connected in parallel to the operating unit 6 in order to smooth the current supplied to the operating unit 6. As the capacitor 7, any capacitor may be used. For example, an inexpensive and large-capacity aluminum electrolytic capacitor or the like can be used.

  Next, the operation of the circuit with capacitor 1 according to the first embodiment will be described.

  When the power source 2 supplies AC power, the AC current is converted into DC current by the rectifying element 4. Further, when the capacitor 7 is in a normal state, since the switch 5 is OFF, the direct current smoothed by the capacitor 7 is supplied to the operating unit 6.

  On the other hand, when an abnormality or replacement time of the capacitor 7 is detected, the switch 5 is turned on and the capacitor circuit 8 is short-circuited. Therefore, a larger current flows through the fuse 3 than when the switch 5 is OFF. Then, Joule heat generated in the fine metal wire of the fuse 3 is increased by the large current, and the fine metal wire is blown. That is, since the entire circuit is opened, not only the capacitor 7 but also the current flowing through the operating unit 6 is cut off.

  When the circuit 1 with a capacitor as described above is used, an abnormality or / and replacement time of the capacitor 7 is detected, and the entire circuit is disconnected. That is, by setting the time when the switch 5 is turned on before the pressure valve is activated, the capacitor 7 is not continuously used until the pressure valve ruptures. Further, since the pressure valve does not rupture, the electrolytic solution does not adhere to the entire apparatus. Moreover, since it is not misunderstood as smoke generated by the fire that has occurred in the past, there are fewer reports to the fire department. In addition, since the circuit 1 with the capacitor is disconnected and cannot be restored, the user can clearly know the replacement time of the capacitor 7.

  Further, for example, when the fuse 3 is cut and the circuit 1 with the capacitor is not operated, and it is difficult to determine whether the fuse 3 is cut or not, the operating unit 6 is operated for whatever reason. It ’s hard to tell if it ’s gone. For this reason, it is preferable to use the fuse 3 which can visually confirm the presence or absence of the thin metal wire inside the fuse 3. When such a fuse 3 is used, the replacement time of the capacitor 7 and the fuse 3 can be easily understood. An example of such a fuse 3 is one in which a thin metal wire is covered with a hollow body made of a material having a high total light transmittance. This is because the user can confirm the replacement time of the capacitor 7 and the fuse 3 by visually confirming the presence or absence of a thin metal wire inside the fuse 3.

(Second Embodiment)
Next, the configuration of the circuit with capacitor 10 according to the second embodiment of the present invention will be described with reference to FIG. The circuit with capacitor 10 according to the second embodiment is the same in electrical circuit as the circuit with capacitor 1 according to the first embodiment. However, in the second embodiment, the capacitor 7 and the switch 5 in the first embodiment are configured as the detection capacitor 11. The positive electrode 11a and the negative electrode 11b are connected to the detection capacitor 11. As a result, the detection capacitor 11 forms the capacitor circuit 8. In the following description, the same number is attached | subjected to the structure similar to the circuit 1 with a capacitor | condenser which concerns on 1st Embodiment, and description is abbreviate | omitted.

  FIG. 3 is a perspective view showing an example of the detection capacitor 11 in the second embodiment. In the following description, the left and right directions on the paper surface of the detection capacitor 11 are the X1 and X2 directions, the back and front sides of the paper are the Y1 and Y2 directions, and the vertical directions are the Z1 and Z2 directions, respectively.

  The detection capacitor 11 according to the second embodiment is a cylindrical electrolytic capacitor whose central axis extends in the Z direction. In the present embodiment, the detection capacitor 11 is mainly composed of a capacitor body 12 and a seat plate 13. Specifically, the seat plate 13 is disposed so as to cover one of the axial ends of the cylindrical capacitor body 12. Further, from the surface of the seat plate 13 in the Z1 direction, two terminals 14a and 14b forming part of the capacitor body 12 protrude in the Z1 direction.

  FIG. 4 is an exploded perspective view of the detection capacitor 11 of FIG. FIG. 5 is a cross-sectional view of the capacitor main body 12 taken along a plane perpendicular to the XY plane including the WW line of FIG.

  In the present embodiment, the capacitor body 12 is mainly composed of a case 21, a capacitor element 22, and a sealing plug 23 as shown in FIG. The side surface of the capacitor body 12 and the surface in the Z2 direction are constituted by a case 21. On the other hand, the surface of the capacitor body 12 in the Z1 direction is such that the case 21 is exposed to the outer peripheral portion (see FIG. 5), and the sealing plug 23 is fitted inside the portion surrounded by the case 21. Further, the internal terminal 41a and the internal terminal 41b of the capacitor element 22 extend in the Z1 direction from the surface in the Z1 direction of the capacitor body 12, that is, the surface in the Z1 direction of the sealing plug 23. Moreover, the terminal 14a and the terminal 14b are each arrange | positioned in the part which the internal terminal 41a and the internal terminal 41b of the sealing plug 23 contact | abut (refer FIG. 5). That is, the length L excluding the internal terminal 41 a and the internal terminal 41 b is slightly smaller in the Z-axis direction than the case 21, the cup-shaped case 21, and the outer periphery having the same diameter as the inner periphery of the case 21 The capacitor body 12 is mainly composed of a sealing plug 23 having

  The radius of the capacitor body 12 is 6 to 20 mm, and the length of the detection capacitor 12 excluding the terminal 14 in the Z-axis direction is 15 to 100 mm. However, it is not limited to these values. Further, a caulking portion which is a side surface of the case 21 and is recessed inward in the radial direction of the capacitor main body 12 may be formed between the capacitor element 22 and the sealing plug 23.

  Next, the case 21 will be described.

  The case 21 houses the capacitor element 22 and has a role of sealing so that the electrolyte or the like does not volatilize or leak. In the present embodiment, the case 21 has a cylindrical shape having a bottom surface 31, and a side surface 32 is provided substantially perpendicularly to the bottom surface 31 from the end of the circular bottom surface 31. An opening 33 is formed on the surface facing the bottom surface 31. As a material of such a case 21, it is preferable to use a material having high airtightness, and for example, it is preferable to use aluminum having high heat resistance, airtightness, and corrosion resistance.

  The capacitor element 22 is arranged inside the case 21 as shown in FIG. Further, a sealing plug 23 is disposed on the end face side in the Z1 direction of the capacitor element 22 (see FIG. 5). Note that the internal terminal 41a and the terminal 41b included in the capacitor element 22 (hereinafter referred to as the internal terminal 41 when referring to both the internal terminal 41a and the internal terminal 41b) are the terminal 14a and the terminal 14b included in the sealing plug 23. (Hereinafter, and in the drawings, when referring to both the terminal 14a and the terminal 14b, they are referred to as the terminal 14).

  Next, the configuration of the capacitor element 22 itself will be described. FIG. 6 is an exploded perspective view for explaining the configuration of the capacitor element 22.

  The capacitor element 22 mainly includes an internal terminal 41 and a winding part 42. The winding part 42 is mainly composed of an anode foil 43, a cathode foil 44 and a separating paper 45.

  The winding part 42 is configured by winding a laminated body in which an isolation sheet 45 as an isolation member is interposed between an anode foil 43 and a cathode foil 44. Further, the electrolytic solution is permeated into the separating paper 45 of the winding portion 42. Further, an internal terminal 41a and an internal terminal 41b are connected to the anode foil 43 and the cathode foil 44, respectively.

  As the anode foil 43, it is preferable to use a valve metal (so-called valve metal), but a material other than the valve metal may be used. As the cathode foil 44, it is preferable to use an aluminum foil having a large surface area by performing an etching process. Similar to the anode foil 43, an anode foil 43 having an aluminum oxide film formed by anodic oxidation on the surface of the cathode foil 44 may be used.

  The separating paper 45 functions as a separator for preventing the anode foil 43 and the cathode foil 44 from physically contacting each other. In addition, since the electrolytic solution penetrating the separator paper 45 reaches the fine irregularities formed by etching, the separator paper 45 penetrated by the electrolytic solution functions as the cathode of the capacitor element 22. As the separating paper 45, it is more preferable to use paper that is not produced from a synthetic fiber but is made from a naturally occurring cellulose material such as manila hemp or vegetal pulp. Since natural paper generally has better heat resistance than synthetic paper, it becomes more preferable when used as separator paper 45. Furthermore, it is preferable to use natural paper as the separating paper 45 because halogen ions and the like generated from the halide contained in most of the synthetic fibers do not cause corrosion of other members of the capacitor body 12.

  As the conductive electrolyte for infiltrating the separating paper 45, a solvent having polyhydric alcohols such as ethylene glycol and glycerin as a main solvent and solutes such as ammonium borate and organic acid ammonium being used as a solute is used. preferable. In order to impregnate the separating paper 45 with the electrolytic solution, the winding portion 42 in which the separating paper 45 is interposed between the anode foil 43 and the cathode foil 44 is impregnated with the electrolytic solution by dip impregnation or the like. In addition, by impregnating the winding portion 42 with the electrolyte under vacuum or under reduced pressure, the electrolyte easily enters the fine irregularities of the anode foil 43, the cathode foil 44, and the separating paper 45.

  In the second embodiment, the internal terminal 41 is a member for electrically connecting the terminal 14 to the anode foil 43 or the cathode foil 44. The end of the internal terminal 41 on the Z2 direction side is connected to the anode foil 43 and the cathode foil 44 by welding or caulking, respectively. The internal terminal 41 connected to the anode foil 43 and the cathode foil 44 protrudes substantially parallel to each other in the Z1 direction, and the Z1 side end of the internal terminal 41 is connected to the Z2 direction side of the terminal 14 by welding or caulking. Yes. As long as the internal terminal 41 and the terminal 14 can be electrically connected, they may be connected by means other than welding or caulking. As the internal terminal 41, a conductive material is used to electrically connect the anode foil 43 and the cathode foil 44 and the terminal 14. The internal terminal 41 is made of, for example, a metal foil.

  Next, the configuration of the sealing plug 23 will be described. FIG. 7 is a perspective view of the sealing plug 23.

  The sealing plug 23 mainly has a sealing plug main body 51 and a terminal 14 for electrically connecting to an internal terminal 41 extending from the capacitor element 22. The sealing plug 23 is used to seal the opening 33 of the case 21. The sealing plug main body 51 is configured by a member that is deformed so as to protrude in the Z1 direction by the pressure inside the case 21 when the pressure inside the case becomes a predetermined pressure or more. Further, the sealing plug body 51 is preferably made of a material that is impermeable to the electrolyte solution used.

As the material of the sealing plug body 51 as described above, for example, an elastic body having an apparent hardness of 65 to 85 IRHD / M (measured value measured by the M method of the international rubber hardness test) is preferably used. An elastic body having an apparent hardness of 65 to 85 IRHD / M has an appropriate elasticity and strength. Therefore, when the pressure inside the case 21 is low, deformation is unlikely to occur, but the pressure for operating the pressure valve The sealing plug 23 can be deformed with the same or low pressure. For example, when the diameter of the sealing plug 23 mainly composed of an elastic body having an apparent hardness of 65 to 85 IRHD / M is about 12.5 mm, the sealing is performed when the pressure inside the case 21 is about 15 to 18 kg / cm ^2. The plug 23 is deformed. When the diameter of the sealing plug 23 is about 40 mm, the sealing plug 23 is deformed when the pressure inside the case 21 is about 5 to 7 kg / cm ² . As such an elastic body, for example, an elastic rubber such as natural rubber (NR), styrene butadiene (SBR), ethylene propylene terpolymer (EPT) or isobutylene / isoprene rubber (IIR) can be used. Among these, it is more preferable to use isobutylene / isoprene rubber (IIR) which has a particularly high airtightness and does not allow the electrolyte to permeate as vapor. Among isobutylene / isoprene rubbers, it is particularly preferable to use vulcanized isobutylene / isoprene rubber having higher heat resistance. As the vulcanized isobutylene / isoprene rubber, for example, vulcanized isobutylene / isoprene rubber such as sulfur vulcanization, quinoid vulcanization, resin vulcanization or peroxide vulcanization can be used.

  The terminal 14 included in the sealing plug 23 is a conductive member that penetrates the sealing plug body 51 in the Z-axis direction. Accordingly, the terminal 14 is electrically connected to the anode foil 43 and the cathode foil 44 via the internal terminal 41. Further, the terminal 14 a electrically connected to the anode foil 43 is connected to the positive electrode side of the circuit 10 with a capacitor. On the other hand, the terminal 42b electrically connected to the cathode foil 44 is connected to the negative electrode side of the circuit 10 with a capacitor. The terminal 14 and the internal terminal 41 may be connected by any method as long as they are electrically connected. For example, a binding portion for binding the internal terminal 41 may be formed on the Z2 direction side of the terminal 14, and the internal terminal 41 may be tied to the terminal 14. Alternatively, the internal terminal 41 and the terminal 14 may be connected by welding or caulking.

  In the second embodiment, the terminal 14 mainly has a connection part 52, a pedestal part 53, a penetrating part 54, and a contact part 55. The connecting portion 52 is a portion that extends in the Z1 direction and is connected to become the positive electrode 11a or the negative electrode 11b of the detection capacitor 11. The pedestal portion 53 is a member that is connected substantially perpendicularly to the connection portion 52 and the through portion 54, and is a member that is disposed along the surface of the sealing plug 23 in the Z1 direction. Further, the area of the XY plane of the pedestal portion 53 is larger than the cross section of the penetrating portion 54 in the Z1 direction. The through portion 54 is a columnar member extending in the Z1 direction, and is a portion that penetrates the through hole 56 of the sealing plug 23 in the Z-axis direction. Further, the Z2 direction side of the penetrating portion 54 is connected to the internal terminal 41. In order to prevent the penetration part 54 from being inserted through the penetration hole 56 and then coming out of the penetration hole 56, the penetration part 54 can be developed into a morning glory shape by biting the sealing plug 23. The through portion 54 may be fixed to the sealing plug 23 by riveting.

  Further, on the surface of the pedestal portion 53 in the X1 direction, a cylindrical contact portion 55 that is lower than the height of the connection portion 52 in the Z1 direction is disposed. The contact portion 55 is disposed at a position overlapping with a conductor 63 described later in the Z direction, and also functions as a conductor.

  Next, the structure of the seat plate 13 will be described. FIG. 8 is a perspective view when the seat plate 13 is viewed in the Z2 direction from below in FIG. FIG. 9 is a plan view in which the inside of the seat plate 13 can be seen. Further, FIG. 10 is a cross-sectional view of the detection capacitor 11 taken along a plane including the TT line shown in FIG. 3 and perpendicular to the XY plane.

  The seat plate 13 mainly includes a circular top plate 61, a side wall 62, and a conductor 63. The side wall 62 is erected on the outer peripheral portion of the top plate 61 in the Z2 direction substantially perpendicular to the top plate 61. The inner periphery of the side wall 62 is substantially the same as the outer periphery of the case 21. Therefore, the seat plate 13 is mounted so as to cover the end of the capacitor body 12 in the Z1 direction.

  Further, in the seat plate 13, through holes 64 are provided in portions overlapping the terminals 14 of the top plate 61 in the Z-axis direction. Therefore, when the seat plate 13 is attached to the capacitor body 12, the terminal 14 can project through the through hole 64 in the Z1 direction.

  Further, on the outer peripheral portion of the surface of the top plate 61 on the Z2 direction side, a rotating ring-shaped convex portion 65 adjacent to the side wall 62 is formed with a height α in the Z direction. Accordingly, when the capacitor main body 12 and the seat plate 13 are fitted together, at least the Z1 of the sealing plug 23 is equal to the height α at which the convex portion 65 protrudes in the Z2 axial direction from the surface of the top plate 61 on the Z2 direction side. A gap is formed between the surface of the direction and the surface of the top plate 61 in the Z2 direction.

  A groove portion 66 (see FIG. 3) is provided on the surface of the top plate 61 in the Z1 direction. The groove 66 is formed so as to have an inclination of, for example, 50 degrees with respect to a line connecting the two through holes 64. A through hole 67 is formed in the region of the groove 66. The through-holes 67 are formed at two positions 180 degrees symmetrically with respect to the circle including the two through-holes 64 (circle indicated by K in FIG. 9) or in an area outside the circle. .

  Further, one conductor 63 is disposed on the surface of the seat plate 13 on the Z2 side. As the conductor 63, for example, a wire mainly composed of metal can be used. The conductor 63 has a central portion disposed inside the seat plate 13, and both end portions thereof are exposed to the outside through the through holes 67 and 67. A portion of the conductor 63 outside the through hole 67 is bent along the groove 66, and is disposed so as to be accommodated in the groove 66 and exposed to the outside. Therefore, in the region between the two through holes 67, the conductor 63 is exposed on the surface of the top plate 61 on the Z2 direction side.

  A portion of the conductor 63 exposed to the Z2 direction side of the top plate 61 is opposed to the contact portion 55 of the terminal 14 via a gap. The shortest distance β between the surface on the Z2 direction side of the conductor 63 inside the seat plate 13 and the surface on the Z1 direction side of the contact portion 55 is, for example, about 0.1 mm to 2.0 mm. In particular, when the distance is 0.2 to 1.0 mm, the ON / OFF of the switch 5 in FIG. 2 can be easily switched. That is, in the circuit with a capacitor 10 according to the second embodiment, the conductor 63 and the contact portion 55 become the switch 5.

  Next, the operation of the capacitor-equipped circuit 10 using the detection capacitor 11 will be described.

  When power is supplied from the power supply 2 to the circuit 10 with a capacitor in a state where the top plate 61 of the detection capacitor 11 and the contact portion 55 are not in contact with each other, the capacitor body 12 smoothes the direct current supplied to the operating portion 6. Functions as a capacitor.

  On the other hand, when the electrolytic solution inside the capacitor body 12 sealed by the case 21 and the sealing plug 23 is gasified due to the ambient environment or usage time of the detection capacitor 11, the internal pressure of the capacitor body 12 increases. Due to the internal pressure of the capacitor body 12, the sealing plug 23 of the capacitor body 12 is deformed and protrudes in the Z1 direction.

  FIG. 11 is a cross-sectional view showing a case where the sealing plug 23 protrudes in the Z1 direction due to an increase in the internal pressure of the capacitor body 12. When the sealing plug 23 protrudes in the Z1 direction, the gap distance β formed between the surface on the Z2 direction side of the conductor 63 and the surface on the Z1 direction side of the contact portion 55 is shortened. When the gap distance β is zero, that is, when the anode-side contact portion 55 and the cathode-side contact portion 55 are electrically connected via the conductor 63, the detection capacitor 11 is short-circuited. That is, the switch 5 is turned on. Therefore, a large current flows through the fuse 3, the fine metal wire arranged inside the fuse 3 is melted, and the entire circuit with capacitor 10 is cut (see FIG. 2).

  When the detection capacitor 11 as described above is used, an increase in the internal pressure of the capacitor body 12 can be detected and the switch 5 can be turned on. Therefore, the power supply to the capacitor body 12 can be stopped before the capacitor body 12 or the sealing plug 23 is destroyed. In particular, since the switch 5 is operated using the internal pressure of destruction of the capacitor body 12 rather than measuring the temperature inside the capacitor body 12, etc., the malfunction can be reduced.

  Further, by using such a detection capacitor 11, it is possible to cut off the power supply to the entire circuit 10 with a capacitor before reaching the use limit of the capacitor body 12. Not only the power supply to the capacitor body 12 is stopped, but also the function of the operation unit 6 is stopped by stopping the power supply to the entire circuit 10 with the capacitor, so that the user can easily know the life of the capacitor body 12. Can do.

  While the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be implemented in various modifications. For example, in the first embodiment and the second embodiment, the number of the operation units 6 is one, but two or more operation units 6 may be provided in parallel to the capacitor 7. Alternatively, a plurality of capacitors 7 may be provided, and one operating unit 6 may be provided for each capacitor 7. Further, when a short circuit occurs in the capacitor circuit 8 without providing the fuse 3, a warning or the like may be displayed or a buzzer may be sounded. Further, the circuits 1 and 10 with capacitors may not have either one or both of the power supply 2 and the operation unit 6.

  Moreover, in 2nd Embodiment, although the form which the sealing plug 23 deform | transforms was shown, the form which members other than the sealing plug 23 deform | transform may be sufficient. For example, the case 21 may be deformed or expanded as the internal pressure of the capacitor body 12 increases.

  Moreover, in 2nd Embodiment, although the form which the sealing plug 23 deform | transforms with the internal pressure of the capacitor | condenser main body 12 was shown, it does not restrict to a deformation | transformation. For example, any method may be used as long as the surface of the sealing plug 23 is displaced such that the volume of the sealing plug 23 expands or the sealing plug 23 itself is pushed out. Further, when the sealing plug 23 is pushed out, a resin or metal having a low elastic modulus may be used as the sealing plug 23.

  Further, in each of the above-described embodiments, the dimension or shape related to each component is illustrated, but the present invention is not limited to the illustrated dimension or shape. For example, the case 21 is assumed to have a cylindrical shape, but is not limited to such a shape. For example, when the capacitor element 22 is not a cylindrical shape, various shapes such as a quadrangular prism or a sphere can be adopted as a shape that matches the shape of the capacitor element 22. A case 21 having a shape different from that of the capacitor element 22 may be employed. For example, even if the capacitor element 22 has a cylindrical shape, the case 21 can also have a rectangular parallelepiped shape. However, by making the shape of the case 21 along the capacitor element 22, the capacitor 7 or the capacitor body 12 can be further downsized.

  In the second embodiment, the detection capacitor 11 includes the seat plate 13 as the detection capacitor 11, but the seat plate 13 is not essential. The conductive member 10 such as the conductor 63 is disposed away from at least one of the anode-side terminal 14a serving as the positive electrode 11a and the cathode-side terminal 14b serving as the negative electrode 11b, and the sealing plug 23 extends in the Z1 direction. Similar effects can be obtained if the conductors are arranged so as to electrically connect the anode-side terminal 14a and the cathode-side terminal 14b when protruding. For example, in the first modification shown in FIG. 12, the conductor 71a and the conductor 71c extending from each terminal of the capacitor main body 12a toward the other terminal are arranged apart from each other at positions overlapping in the Z direction. . Therefore, when the sealing plug 23 protrudes in the Z1 direction, the conductor 71b on the side close to the sealing plug 23 comes into contact with the other conductor 71a, so that the switch 5 including the conductors 71a and 71b is turned on.

  Moreover, in 2nd Embodiment, although the form which provides the conductor 63 in the seat board 13 side was illustrated, it is not restricted to such a form. For example, as shown in FIG. 13, the conductor 63 a is disposed between the two terminals 14 on the Z1 direction side surface of the sealing plug 23 on the sealing plug 23 side of the capacitor body 12 b. Then, on the side of the seat plate 13c, the contact portion 82a and the contact portion 82b connected to each terminal 14 may be arranged so as to be separated from each other at a position overlapping the conductor 81 in the Z-axis direction.

  Further, in each of the above-described embodiments, the internal terminal 41 as a so-called tab terminal is connected to the terminal 14 and pulled out of the case member, but is not limited to such a form. For example, the capacitors 1 and 10 having so-called lead terminals that are connected to the anode foil 43 and the cathode foil 44 and drawn out to the outside of the sealing plug 23 may be used. When the lead terminal is used, for example, the contact portion can be formed by bending a lead wire connected to the lead terminal. That is, when the sealing plug 23 is deformed or displaced, the lead wires come into contact with each other at the contact portion, and a short circuit can be formed.

  Further, in the second embodiment, the conductor 63 disposed on the seat plate 13 is exemplified as a wire, but is not limited to the wire. For example, a foil or a layer made of metal may be used. In addition, any material may be used as long as it is a conductive substance, not limited to metal. However, among these, it is preferable to use a metal having a low electric resistance.

  Further, in the second embodiment, the detection capacitor 11 having the seat plate 13 is illustrated as the detection capacitor 11, but the seat plate 13 is disposed so as to be able to contact and separate from the capacitor body 12. It may be reusable. Conversely, the seat plate 13 may be fixed to the capacitor body 12. When the seat plate 13 is fixed to the capacitor main body 12, it can be used more stably even under vibration.

  Further, the capacitor 7 or the detection capacitor 11 arranged in the circuits with capacitors 1 and 10 does not prevent the provision of the pressure valve. When the capacitor 7 or the detection capacitor 11 has a pressure valve, safety can be further improved. Further, when a pressure valve is provided in the detection capacitor 11, it can be dealt with by adjusting the material of the sealing plug 23 and the gap β so that the switch 5 is turned on at a pressure lower than the pressure at which the pressure valve operates. .

  Further, in each of the above-described embodiments, the circuits with capacitors 1 and 10 have the fuse 3, but are devices other than the fuse 3 and have a function of cutting the electric circuit as the current value increases. A device may be used.

It is a circuit diagram showing a circuit with a capacitor concerning a 1st embodiment of the present invention. It is the circuit diagram of the circuit with a capacitor | condenser which concerns on the 2nd Embodiment of this invention, and its principal part enlarged view. It is a perspective view of the capacitor | condenser for a detection used for the circuit with a capacitor | condenser shown in FIG. FIG. 4 is an exploded perspective view of the detection capacitor of FIG. 3. FIG. 5 is a cross-sectional view when the capacitor body of the detection capacitor shown in FIG. 4 is cut along a plane perpendicular to the Y axis including the WW line shown in FIG. 3. It is a perspective view explaining the capacitor | condenser element of the capacitor | condenser for a detection shown in FIG. FIG. 5 is a perspective view of a sealing plug and a terminal of the detection capacitor shown in FIG. 4. It is a perspective view at the time of seeing the seat plate of the capacitor | condenser for a detection shown in FIG. 4 from the back side. It is a top view at the time of seeing the seat board shown in FIG. 8 from the back side. FIG. 4 is a cross-sectional view of the detection capacitor shown in FIG. 3 cut along a plane perpendicular to the Y axis including a TT line shown in FIG. 3. FIG. 11 is a cross-sectional view illustrating a state in which a switch is ON in the detection capacitor illustrated in FIG. 10. FIG. 6 is a cross-sectional view for explaining a first modification of the detection capacitor shown in FIG. 3. FIG. 10 is a cross-sectional view for explaining a second modification of the detection capacitor shown in FIG. 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,10 ... Circuit 2 with capacitor ... Power supply 3 ... Fuse 5 ... Switch 6 ... Operation part 7 ... Capacitor 8 ... Capacitor circuit 11 ... Detection capacitor 12 ... Capacitor body 13 ... Seat plate 14 ... Terminal 14a ... Terminal 14b on the anode side ... cathode side terminal 21 ... case 22 ... capacitor element 23 ... sealing plug 41 ... internal terminal 42 ... winding part 51 ... sealing plug body 52 ... connection part 53 ... pedestal part 54 ... penetrating part 55 ... contact part 56 ... through hole 61 ... Top plate 62 ... Side wall 63 ... Conductor

Claims (4)

A fuse connected in series to a power source for supplying power;
A capacitor having terminals on the anode side and the cathode side;
A circuit with a capacitor having a switch connected in parallel with the capacitor and forming a short circuit that detects a replacement time of the capacitor and stops the function of the capacitor. The circuit with a capacitor according to claim 1,
The capacitor includes a capacitor element;
A case having an opening for accommodating the capacitor element;
A sealing plug for sealing the opening of the case, and
The sealing plug is deformed or displaced by increasing the internal pressure of the capacitor,
The circuit with a capacitor, wherein the switch forms the short-circuit path by deformation or displacement of the sealing plug. In the circuit with a capacitor according to claim 1 or 2,
It has a conductor that is arranged apart from at least one of the terminal on the anode side or the terminal on the cathode side,
When the sealing plug is deformed or displaced, the conductor is a terminal on the anode side,
A circuit with a capacitor, wherein the short-circuit path of the switch is formed by electrically connecting the terminal on the cathode side. In the circuit with a capacitor according to any one of claims 1 to 3,
The circuit with a capacitor, wherein the capacitor and the switch are one component as a detection capacitor.

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