JP5144303B2 - Film capacitor - Google Patents

Description

  The present invention provides a wound body having a configuration in which a first electrode pattern and a second electrode pattern are wound in a state of being opposed to each other with a dielectric film interposed therebetween, and electrically connected to one end of the wound body The present invention relates to a film capacitor having a connected first terminal part and a second terminal part electrically connected to the other end of the wound body, and in particular, a film capacitor having both a self-healing function and a self-safety mechanism. About.

  Conventionally, film capacitors having both a self-healing function and a self-protection mechanism are disclosed in, for example, Patent Documents 1 to 5.

  The film capacitor described in Patent Document 1 prevents the unnecessary operation of the fuse mechanism against an overload current by changing the width of the fuse mechanism by forming a cross in the shape of a slit and changing the width of the fuse mechanism. ing.

  However, since it has a configuration in which a large number of slits are provided and a large number of segments are arranged, there is a problem in that a heat dissipation path cannot be secured and there is a limit in improving the allowable current value.

  The film capacitor described in Patent Document 2 has a configuration in which a region in which a predetermined number of segmented electrodes are arranged is separated and arranged, thereby improving the safety function, inrush current at power-on, short-circuit discharge, etc. The purpose is to ensure good current resistance against a sudden overcurrent.

  However, in Patent Document 2, since regions where a predetermined number of segmented electrodes are arranged are separated from each other, similarly to Patent Document 1, a heat dissipation path cannot be secured, and an allowable current is also allowed. There is a problem that there is a limit to the improvement of the value.

  In the film capacitor described in Patent Document 3, even when a microdestructor that cannot be cleared occurs by forming a region in which a predetermined number of microblocks are arranged separately at electrode separators, even if microdestruction that cannot be cleared occurs, The purpose is to prevent.

  However, even in this Patent Document 3, since the regions in which a predetermined number of micro blocks are arranged are separated from each other, a heat dissipation path cannot be ensured as in Patent Document 2, and an allowable current is also allowed. There is a problem that there is a limit to the improvement of the value.

  The film capacitor described in Patent Document 4 has a configuration in which a large number of divided small electrode portions are connected to a large electrode portion formed continuously in the length direction of the film. Although the heat dissipation path of the split small electrode part connected directly to the large electrode part is secured, the heat dissipation path of the split small electrode part aligned in the width direction of the film is not secured. However, there is a problem that the allowable current value is limited.

  Therefore, the present inventors have proposed a film capacitor that has good heat dissipation and heat dispersibility, can have both a self-healing function and a self-protection mechanism, and can be applied to various applications ( (See Patent Document 5).

JP-A-8-31690 Japanese Patent No. 3710873 Japanese Patent No. 3454403 JP 2005-12082 A JP 2007-299921 A

  However, in the film capacitor described in Patent Document 5, since each minute section is connected by only one narrow fuse portion, the loss in the film capacitor is increased, tan δ is increased, and the self-heating temperature is increased. To rise. That is, although the resistance value of each fuse part is very small, since only one fuse part is connected in series, the total film capacitor adds up to increase loss and tan δ.

  Therefore, the present invention reduces the loss inside the film capacitor and reduces tan δ by connecting a plurality of fuse sections adjacent to each other so that there are a plurality of fuse parts in parallel, and the self-heating temperature is reduced. Providing a film capacitor that has a self-healing function and a self-protection function that can improve the withstand voltage (breakdown voltage) and also has good heat dissipation and heat dispersibility. For the purpose.

  The film capacitor according to the present invention includes a wound body having a configuration in which a first electrode pattern and a second electrode pattern are wound in a state of facing each other with a dielectric film interposed therebetween, and one end portion of the wound body A film capacitor having a first terminal portion electrically connected to the second terminal portion and a second terminal portion electrically connected to the other end of the wound body, wherein the first electrode pattern is A first extraction electrode portion extending continuously along the longitudinal direction of the dielectric film, a plurality of first capacitor electrode portions extending substantially at right angles from the first extraction electrode portion, and between the first capacitor electrode portions And a second capacitor electrode part connected to the first capacitor electrode part, wherein the second electrode pattern extends continuously along the longitudinal direction of the dielectric film. Two extraction electrode portions, A plurality of third capacitor electrode portions each extending substantially at right angles from the extraction electrode portion; and a fourth capacitor electrode portion disposed between the third capacitor electrode portions and connected to the third capacitor electrode portion. The width of the fourth capacitor electrode portion along the longitudinal direction of the dielectric film is wider than the width of the first capacitor electrode portion along the longitudinal direction of the dielectric film, and the third capacitor electrode portion The width along the longitudinal direction of the dielectric film of the second capacitor electrode portion is set wider than the width along the longitudinal direction of the dielectric film, and the first extraction electrode portion of the first electrode pattern is The dielectric film is formed to extend to one side end of the dielectric film so as to be electrically connected to the first terminal portion, and the second extraction electrode portion of the second electrode pattern has the second end. So as to be electrically connected to a part, relates to a film capacitor having both a self-healing function and a self-security mechanism, characterized in that it is formed to extend to the other side edge of the dielectric film.

  In the present invention, the second capacitor electrode portion of the first electrode pattern is separated into a plurality of first sections arranged along the width direction and the length direction of the dielectric film, Among the first sections, the first section adjacent to the first capacitor electrode part and the first capacitor electrode part are connected via a narrow first fuse part, and among the plurality of first sections, The plurality of the first compartments adjacent to the first extraction electrode portion and the first extraction electrode portion are connected via a narrow second fuse portion and arranged along the width direction of the dielectric film. Are connected via a narrow third fuse part, and the plurality of first sections arranged along the length direction of the dielectric film are connected via a narrow fourth fuse part. Connected to the second electrode pattern The fourth capacitor electrode portion is separated into a plurality of second sections arranged along the width direction and the length direction of the dielectric film, and the third capacitor electrode of the plurality of second sections. The second section adjacent to the first section and the third capacitor electrode section are connected via a narrow fifth fuse section, and the second section adjacent to the second extraction electrode section among the plurality of second sections. Two sections and the second extraction electrode section are connected via a narrow sixth fuse section, and the plurality of second sections arranged along the width direction of the dielectric film are narrow seventh. The plurality of second sections connected via a fuse portion and arranged along a length direction of the dielectric film are connected via narrow eighth fuse portions, respectively.

  Furthermore, the width of the first capacitor electrode portion is smaller than the width of the first capacitor electrode portion and the width of the first fuse portion between the first extraction electrode portion and the first capacitor electrode portion of the first electrode pattern. A ninth fuse portion is formed, and is narrower than the second capacitor electrode portion between the second extraction electrode portion and the second capacitor electrode portion of the second electrode pattern, and the second fuse. A tenth fuse portion wider than the width of the portion is formed.

  As described above, according to the present invention, a plurality of fuse portions are connected to each other so as to be adjacent to each other so as to be diversified, so that the loss inside the film capacitor is reduced and tan δ is reduced. As a result, an increase in the self-heating temperature can be suppressed. Since the self-heating temperature is lowered, the film capacitor itself is not easily affected by heat, and the allowable current and operating temperature range are improved. Of course, since the number of fuse parts connected to the first section and the second section is large, even if several fuse parts are disconnected during self-healing (clearing), a decrease in capacitance is suppressed. The Therefore, even if the drive voltage is increased, the change in capacitance is small while self-healing is occurring. This leads to an improvement in withstand voltage (breakdown voltage).

  In the present invention, the wound body includes a first dielectric film in which the first electrode pattern is formed on one side, and a second dielectric film in which the second electrode pattern is formed on one side, The first electrode pattern and the second electrode pattern may be overlapped so as not to contact each other, and the overlapped first dielectric film and second dielectric film may be wound.

  In the present invention, the wound body has a dielectric film in which the first electrode pattern is formed on one side and the second electrode pattern is formed on the other side, and electrode patterns are formed on both sides. The dielectric film spacer may be superposed, and the superposed dielectric film and the dielectric film spacer may be wound.

  Moreover, in this invention, the both ends of the width direction of the said dielectric film may each be cut into the waveform. Here, as the waveform, for example, a waveform conforming to a sine wave or a triangular wave, a semicircular shape, or the like can be considered.

  As described above, according to the film capacitor according to the present invention, the loss inside the film capacitor is reduced by connecting a plurality of fuse sections adjacent to each other so as to be diverse in parallel. This reduces tan δ, suppresses the rise in self-heating temperature, and also improves the withstand voltage (breakdown voltage), and also has a self-recovery function and self-safety with good heat dissipation and heat dispersibility. A film capacitor having both functions can be obtained.

  Hereinafter, embodiments of the film capacitor according to the present invention will be described with reference to FIGS.

  First, as shown in FIG. 1, a film capacitor according to the first embodiment (hereinafter referred to as a first film capacitor 10 </ b> A) is electrically connected to a wound body 12 and one end of the wound body 12. The first terminal portion 14 is connected to the other end, and the second terminal portion 16 is electrically connected to the other end of the wound body 12.

  As shown in FIG. 2, the wound body 12 has a configuration in which the first electrode pattern 18 </ b> A and the second electrode pattern 18 </ b> B are wound with the dielectric film 20 being opposed to each other.

  In particular, the wound body 12 of the first film capacitor 10A includes a first dielectric film 22A having a first electrode pattern 18A formed on one side and a second electrode pattern on one side, as shown in FIGS. The second dielectric film 22B on which the 18B is formed is overlaid so that the first electrode pattern 18A and the second electrode pattern 18B do not come into contact with each other, and the overlaid first dielectric film 22A and the second dielectric film are overlapped. It is configured by winding 22B.

  The first dielectric film 22A and the second dielectric film 22B may be composed of PP (polypropylene), PET (polyethylene terephthalate), PPS (polyphenylene sulfide), PEN (polyethylene naphthalate), PI (polyimide), etc., respectively. it can. The width Wa of the first dielectric film 22A and the second dielectric film 22B is 10 to 200 mm, preferably 10 to 100 mm. The thickness ta (see FIG. 3) is several μm to several tens of μm, preferably 1.5 to 30 μm.

The first electrode pattern 18A and the second electrode pattern 18B can be formed of a vapor deposition film such as aluminum, zinc, or an alloy of aluminum and zinc. The thickness tb of the first electrode pattern 18A and the second electrode pattern 18B is preferably such that the sheet resistance satisfies 1 to 20 ohm / mm ² , for example, 100 to 1000 angstroms.

  The capacitance value of the first film capacitor 10A is several nF to several hundred μF, and preferably several tens μF to several hundred μF. For example, several hundred volts (direct current) is assumed as the rated voltage, and several tens of amperes are assumed as the rated current.

  The overall shape includes a cylindrical shape as shown in FIG. 1, a flat shape as shown in FIG.

  As shown in FIGS. 2 and 5A, the first electrode pattern 18A includes a first extraction electrode portion 24A that extends continuously along the longitudinal direction of the first dielectric film 22A, and the first extraction electrode portion 24A. A plurality of first capacitor electrode portions 26A extending substantially at right angles from each other, and a second capacitor electrode portion 26B disposed between the first capacitor electrode portions 26A and connected to the first capacitor electrode portion 26A.

  Similarly, as shown in FIG. 2 and FIG. 5B, the second electrode pattern 18B includes a second extraction electrode portion 24B extending continuously along the longitudinal direction of the second dielectric film 22B, and the second extraction pattern 24B. A plurality of third capacitor electrode portions 26C extending substantially at right angles from the electrode portion 24B, and a fourth capacitor electrode portion 26D disposed between the third capacitor electrode portions 26C and connected to the third capacitor electrode portion 26C. Have.

  Here, the width W4 along the longitudinal direction of the second dielectric film 22B of the fourth capacitor electrode portion 26D is wider than the width W1 along the longitudinal direction of the first dielectric film 22A of the first capacitor electrode portion 26A, and The width W2 along the longitudinal direction of the first dielectric film 22A of the second capacitor electrode portion 26B is wider than the width W3 along the longitudinal direction of the second dielectric film 22B of the third capacitor electrode portion 26C.

  When the wound body 12 is used, as shown in FIGS. 3 and 5C, the first capacitor electrode portion 26A of the first electrode pattern 18A and the fourth capacitor electrode portion 26D of the second electrode pattern 18B are connected to each other. The first dielectric film 22A or the second dielectric film 22B is sandwiched between the second capacitor electrode part 26B of the first electrode pattern 18A and the third capacitor electrode part 26C of the second electrode pattern 18B. Alternatively, it is preferable that the second dielectric films 22B overlap with each other.

  The first extraction electrode portion 24A of the first electrode pattern 18A is formed to extend to one side end 30a of the first dielectric film 22A so as to be electrically connected to the first terminal portion 14. . Similarly, the second extraction electrode portion 24B of the second electrode pattern 18B extends to the other side end 32b of the second dielectric film 22B so as to be electrically connected to the second terminal portion 16. Has been.

  As shown in FIG. 5A, the second capacitor electrode portion 26B of the first electrode pattern 18A is separated into a plurality of first sections 34 arranged along the width direction of the first dielectric film 22A.

  The plurality of first sections 34 are connected to the first capacitor electrode section 26A via the first fuse sections 36 each having a narrow width. Among the plurality of first sections 34, the first section 34 adjacent to the first extraction electrode section 24A is adjacent. The section 34 and the first extraction electrode portion 24A are connected via a narrow second fuse section 38, and the plurality of first sections 34 arranged along the width direction of the first dielectric film 22A are each narrow. The plurality of first sections 34 connected via the third fuse portion 40 and arranged along the length direction of the first dielectric film 22A are connected via the narrow fourth fuse portion 50, respectively. Yes. In the example of FIG. 5A, six first sections 34 are arranged along the width direction of the first dielectric film 22A, and two first sections 34 are formed along the length direction of the first dielectric film 22A. An example is shown.

  Similarly, as shown in FIG. 5B, the fourth capacitor electrode portion 26D of the second electrode pattern 18B has a plurality of second sections 42 arranged along the width direction and the length direction of the second dielectric film 22B. Have been separated.

  The plurality of second sections 42 are connected to the third capacitor electrode section 26C via the narrow fifth fuse section 44, respectively, and the second section 42 of the plurality of second sections 42 adjacent to the second extraction electrode section 24B. The section 42 and the second extraction electrode portion 24B are connected via a narrow sixth fuse section 46, and the plurality of second sections 42 arranged along the width direction of the second dielectric film 22B are each narrow. The plurality of second sections 42 connected through the seventh fuse portion 48 and arranged along the length direction of the second dielectric film 22B are connected through the narrow eighth fuse portion 52, respectively. Yes. In the example of FIG. 5B, six second sections 42 are arranged along the width direction of the second dielectric film 22B, and two second sections 42 are formed along the length direction of the second dielectric film 22B. An example is shown.

  Thereby, in the first film capacitor 10A, even if an abnormality occurs, the first film capacitor 10A can be electrically separated in units of the first section 34 and the second section 42. Can be avoided. In addition, a wide first capacitor electrode portion 26A is disposed between the first fuse portion 36 and the first extraction electrode portion 24A, and a wide third capacitor electrode is disposed between the fifth fuse portion 44 and the second extraction electrode portion 24B. Since the capacitor electrode portion 26C is arranged, the first capacitor electrode portion 26A and the third capacitor electrode portion 26C can be effectively used as a heat dissipation path. That is, in the first film capacitor 10A, it is possible to deal with various applications such as a sufficient heat dissipation path and an improved allowable current value.

  Further, the first film capacitor 10A includes a first capacitor electrode portion 26A and a second capacitor electrode portion 26B, and a plurality of first sections 34 arranged between the first capacitor electrode portions 26A include the first capacitor electrode portion 26A. And the first section 34 adjacent to the first extraction electrode section 24A is connected to the first extraction electrode section 24A via the second fuse section 38, and each first section 34 are connected to each other through a narrow third fuse portion 40 and a fourth fuse portion 50, and similarly, a plurality of second sections 42 arranged between the third capacitor electrode portions 26C are formed in the first fuse portion 40C. 3 capacitor electrode portion 26C and fifth fuse portion 44 are connected, and second section 42 adjacent to second extraction electrode portion 24B is connected to second extraction electrode portion 24B via sixth fuse portion 46. Further, the second compartment 42, and the connection form through a seventh fuse unit 48 and the eighth fuse portion 52 of the narrow, respectively.

  That is, a plurality of fuse sections are connected to each other so that they are adjacent to each other so as to be diversified in parallel, so that the loss inside the film capacitor is reduced and tan δ is reduced. An increase in temperature can be suppressed. Moreover, since the self-heating temperature is lowered, the first film capacitor 10A itself is not easily affected by heat, and the allowable current and the operating temperature range are improved. Of course, since the number of fuse parts connected to the first section 34 and the second section 42 is large, even if several fuse parts are disconnected during self-healing (clearing), the capacitance is reduced. It is suppressed. Therefore, even if the drive voltage is increased, the change in capacitance is small while self-healing is occurring. This leads to an improvement in withstand voltage (breakdown voltage).

  Further, as shown in FIG. 5A, the first fuse pattern 24A is narrower than the first capacitor electrode portion 26A between the first extraction electrode portion 24A and the first capacitor electrode portion 26A, and the first fuse. A ninth fuse portion 54 wider than the width of the portion 36 and the second fuse portion 38 is formed.

  Similarly, as shown in FIG. 5B, the width between the second extraction electrode portion 24B and the third capacitor electrode portion 26C in the second electrode pattern 18B is narrower than the width of the third capacitor electrode portion 26C, and the fifth A tenth fuse portion 56 wider than the width of the fuse portion 44 is formed.

  In this case, for example, even if there is a wide range of defects including a single first capacitor electrode portion 26A, it can be electrically separated into units of the first capacitor electrode portion 26A. Such as an overlap between the first capacitor electrode portion 26A of the first electrode pattern 18A and the fourth capacitor electrode portion 26D of the second electrode pattern 18B, and the second of the first electrode pattern 18A. The self-security mechanism also functions when the overlap between the capacitor electrode portion 26B and the third capacitor electrode portion 26C of the second electrode pattern 18B is deviated.

  In the above-described example, six first sections 34 are arranged between the first capacitor electrode portions 26A along the width direction of the first dielectric film 22A, and 2 along the length direction of the first dielectric film 22A. Two first sections 34 are arranged, and similarly, six second sections 42 are arranged between the third capacitor electrode portions 26C along the width direction of the second dielectric film 22B. Although the example which arranged the 2nd division 42 along the length direction was shown, the number to arrange is arbitrary, for example, like film capacitor 10Aa concerning a modification shown in Drawing 6A-Drawing 6C, the 1st Between the capacitor electrode portions 26A, six first sections 34 are arranged along the width direction of the first dielectric film 22A, and four first sections 34 are arranged along the length direction of the first dielectric film 22A. Similarly, the third condenser Between the electrode portions 26C, six second sections 42 are arranged along the width direction of the second dielectric film 22B, and four second sections 42 are arranged along the length direction of the second dielectric film 22B. You may do it.

  Also in this case, the first capacitor electrode portion 26A and the third capacitor electrode portion 26C can be effectively used as a heat dissipation path. In particular, since the number of the first sections 34 and the second sections 42 is made larger than that of the first film capacitor 10A, even if an abnormality occurs, it is possible to more reliably avoid a large decrease in capacity at the time of the abnormality. can do.

  Next, a film capacitor according to a second embodiment (hereinafter referred to as a second film capacitor 10B) will be described with reference to FIG.

  As shown in FIG. 7, the second film capacitor 10B has substantially the same configuration as the first film capacitor 10A described above, but one side end 30a and the other side end 30b of the first dielectric film 22A are respectively It is cut into a waveform (for example, a sine wave), and is different in that one side end 32a and the other side end 32b of the second dielectric film 22B are each cut into a waveform. In FIG. 7, for example, a waveform conforming to a sine wave is shown as a waveform, but a waveform conforming to a triangular wave, a semicircular shape, and the like are conceivable.

  When one side end 30a and the other side end 30b of the first dielectric film 22A and one side end 32a and the other side end 32b of the second dielectric film 22B are formed on a straight line, respectively, When the winding body 12 is used, the first extraction electrode portion 24A and the second extraction electrode portion 24B are not easily exposed from one end and the other end of the winding body 12, and the first terminal portion 14 and the second terminal There is a possibility that the electrical connection with the portion 16 is not good. In addition, the adhesion between each end of the wound body 12 and the first terminal portion 14 or the second terminal portion 16 may become a problem.

  Therefore, one side end 30a and the other side end 30b of the first dielectric film 22A are each cut into a waveform, and one side end 32a and the other side end 32b of the second dielectric film 22B are each cut into a waveform. Accordingly, when the wound body 12 is formed, the first extraction electrode portion 24A and the second extraction electrode portion 24B are easily exposed from one end and the other end of the winding body 12, and the first terminal The electrical connection with the portion 14 and the second terminal portion 16 can be improved, and the adhesion with the first terminal portion 14 and the second terminal portion 16 can also be improved. This can avoid the passage of a large local current and can improve the reliability.

  Next, a film capacitor according to a third embodiment (hereinafter referred to as a third film capacitor 10C) will be described with reference to FIGS.

  The third film capacitor 10C has substantially the same configuration as the first film capacitor 10A described above, but the wound body 12 is different as follows.

  That is, as shown in FIGS. 8 and 9, the wound body 12 of the third film capacitor 10C has the first electrode pattern 18A formed on one side and the second electrode pattern 18B formed on the other side. The dielectric film 60A and the spacer 60B having no electrode pattern formed on both sides are overlapped, and the overlapped dielectric film 60A and the spacer 60B are wound.

  Since the other configuration is the same as that of the first film capacitor 10A described above, a duplicate description thereof is omitted.

  In the above example, a rectangle is illustrated as the first section 34 and the second section 42, but other shapes such as a triangle, a parallelogram, a hexagon, and the like are also possible.

[First Experimental Example]
Next, a first experimental example is shown. In this first experimental example, the DC bias characteristics (capacitance change rate with respect to the DC bias voltage) were measured for the example and the comparative example.

  The example has the same configuration as the first film capacitor 10A, the comparative example has the same configuration as the film capacitor shown in FIG. 7 of Patent Document 5 described above, and the capacitance values of the example and the comparative example are It was made to be the same.

  The measuring method is as follows.

(1) Each electrostatic capacity of an Example and a comparative example is measured.

(2) Examples and comparative examples are fixed to a withstand voltage jig.

(3) Turn on the power and automatically boost the voltage at a speed of 100 V / sec.

(4) Hold for 60 seconds when the set voltage is reached (500 V in this case) (use timer).

(5) Turn off the power.

(6) After confirming that the voltage is 0 V, the film capacitor according to the example and the film capacitor according to the comparative example are removed from the withstand voltage jig.

(7) The capacitances of the examples and comparative examples are measured, and the rate of change is plotted.

(8) Repeat (2) to (7) described above. The DC bias voltage is stepped up by 100V (500V → 600V → 700V →... → 1800V).

  The measurement results are shown in FIG.

  From this measurement result, if the withstand voltage value (breakdown voltage value) is a voltage value at which the capacitance value starts to decrease, the withstand voltage value of the comparative example is 1000 V, and the withstand voltage value of the example is 1200 V. It was.

  Moreover, when the transition of the capacitance change rate at the withstand voltage value or higher is seen, it can be seen that the comparative example changes more greatly (the inclination is larger) than the example.

[Second Experimental Example]
Next, a second experimental example is shown. In this second experimental example, the current load characteristic, that is, the value when the temperature change becomes constant when a constant current is passed (temperature change ΔT [° C.]) is measured for the above-described example and comparative example. It is a thing.

  The measuring method is as follows.

(1) As shown in FIG. 12, the terminals of the first film capacitor 10A according to the example and the film capacitor 70 according to the comparative example are soldered.

(2) As shown in FIG. 12, a T-type thermocouple 72 is attached to the center of each side surface of the first film capacitor 10A according to the example and the film capacitor 70 according to the comparative example.

(3) The first film capacitor 10A according to the example and the film capacitor 70 according to the comparative example are accommodated in a resin case (not shown), and resin (for example, urethane resin) is cast.

(4) As shown in FIG. 11, a parallel circuit of an AC power source 74 and a test coil 76 is provided at each terminal of the first film capacitor 10A according to the example housed in the resin case and the film capacitor 70 according to the comparative example. The parallel resonance circuit 78 is configured and a current load test is performed.

(5) The load current is monitored with a Rogowski coil and oscilloscope (not shown).

(6) Each temperature (and temperature change) of the first film capacitor 10A according to the example and the film capacitor 70 according to the comparative example is measured by connecting the attached thermocouple 72 to a data logger.

(7) The load current is first set to 10 amperes, the load current is set to 15A from the time when the temperature change becomes constant, the load current is set to 20A from the time when the temperature change becomes constant again, and the temperature change becomes constant again. The measurement is finished at the time.

  The measurement results are shown in Table 1 below and FIG.

  First, as shown in Table 1 and FIG. 13, the dielectric loss tangent tan δ (initial value) of the first film capacitor 10A according to the example is 0.23 [%], and the dielectric loss tangent tan δ of the film capacitor 70 according to the comparative example. The (initial value) was 0.35 [%].

  At a load current value = 10 amperes, the temperature change of the film capacitor 70 according to the comparative example became constant after 45 minutes from the start of measurement, and the value (temperature change ΔT) was 3.1 ° C. Met. On the other hand, the temperature change of the first film capacitor 10A according to the example became constant after 45 minutes from the start of measurement, and the value (temperature change ΔT) was 2.5 ° C., which is a comparative example. The value was lower.

  Similarly, when the load current value = 15 A, the temperature change of the film capacitor 70 according to the comparative example becomes constant after 53 minutes from the start of measurement of the load current = 15 A, and the value (temperature change ΔT). Was 6.5 ° C. On the other hand, the temperature change of the first film capacitor 10A according to the example became constant after 53 minutes from the start of the measurement, and the value (temperature change ΔT) was 5.5 ° C., which is a comparative example. The value was lower.

  Similarly, when the load current value = 20 A, the temperature change of the film capacitor 70 according to the comparative example becomes constant after 55 minutes from the start of measurement of the load current = 20 A, and the value (temperature change ΔT). Was 12.0 ° C. On the other hand, the temperature change of the first film capacitor 10A according to the example became constant after 55 minutes from the start of the measurement, and its value (temperature change ΔT) was 10.2 ° C. The value was lower.

  Thus, it can be seen that the example has a lower self-heating temperature than the comparative example.

  The film capacitor according to the present invention is not limited to the above-described embodiment, and can of course have various configurations without departing from the gist of the present invention.

It is a perspective view which shows an example of the external shape of a 1st film capacitor. It is a perspective view which abbreviate | omits and shows a structure of the winding body of a 1st film capacitor. It is sectional drawing which abbreviate | omits and shows the structure of a 1st film capacitor. It is a perspective view which shows the other example of the external shape of a 1st film capacitor. FIG. 5A is a plan view showing the first film capacitor with a part of the first dielectric film and the first electrode pattern omitted, and FIG. 5B is a part of the second dielectric film and the second electrode pattern omitted. FIG. 5C is a perspective view showing a partially omitted state where the first dielectric film and the second dielectric film are overlapped. 6A is a plan view showing a modification of the first film capacitor with a part of the first dielectric film and the first electrode pattern omitted, and FIG. 6B is a part of the second dielectric film and the second electrode pattern. FIG. 6C is a perspective view showing a partially omitted state in which the first dielectric film and the second dielectric film are superposed. It is a perspective view which abbreviate | omits and shows a structure of the winding body of a 2nd film capacitor. It is a perspective view which abbreviate | omits and shows a structure of the winding body of a 3rd film capacitor. It is sectional drawing which abbreviate | omits and shows a structure of a 3rd film capacitor. It is a graph which shows the measurement result of the 1st example of an experiment (DC bias characteristic: capacitance change rate to DC bias voltage). It is a circuit diagram which shows the parallel resonant circuit used in the 2nd experiment example (current load characteristic). It is explanatory drawing which shows the example of attachment of the thermocouple to a film capacitor. It is a graph which shows the measurement result of the 2nd example of an experiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10A ... 1st film capacitor 10B ... 2nd film capacitor 10C ... 3rd film capacitor 12 ... Winding body 14 ... 1st terminal part 16 ... 2nd terminal part 18A ... 1st electrode pattern 18B ... 2nd electrode pattern 20, 60A ... dielectric film 22A ... first dielectric film 22B ... second dielectric film 24A ... first extraction electrode part 24B ... second extraction electrode part 26A ... first capacitor electrode part 26B ... second capacitor electrode part 26C ... third Capacitor electrode portion 26D ... fourth capacitor electrode portion 34 ... first section 36 ... first fuse portion 38 ... second fuse portion 40 ... third fuse portion 42 ... second compartment 44 ... fifth fuse portion 46 ... sixth fuse portion 48 ... 7th fuse part 50 ... 4th fuse part 52 ... 8th fuse part 54 ... 9th fuse part 56 ... 10th fuse part 60B ... Spacer

Claims (3)

A wound body having a configuration in which the first electrode pattern and the second electrode pattern are wound in a state of being opposed to each other with a dielectric film interposed therebetween, and a first electrically connected to one end of the wound body A film capacitor having one terminal part and a second terminal part electrically connected to the other end of the wound body,
The first electrode pattern includes a first extraction electrode portion that continuously extends along a longitudinal direction of the dielectric film, and a plurality of first capacitor electrode portions that extend substantially perpendicularly from the first extraction electrode portion, respectively. A second capacitor electrode part disposed between the first capacitor electrode parts and connected to the first capacitor electrode part,
The second electrode pattern includes a second extraction electrode portion that continuously extends along a longitudinal direction of the dielectric film, and a plurality of third capacitor electrode portions that extend substantially perpendicularly from the second extraction electrode portion, respectively. A fourth capacitor electrode portion disposed between the third capacitor electrode portions and connected to the third capacitor electrode portion,
The width of the fourth capacitor electrode portion in the longitudinal direction of the dielectric film is wider than the width of the first capacitor electrode portion in the longitudinal direction of the dielectric film, and the third capacitor electrode portion has the width in the longitudinal direction. The width along the longitudinal direction of the dielectric film of the second capacitor electrode portion is set wider than the width along the longitudinal direction of the dielectric film,
The first extraction electrode portion of the first electrode pattern is formed to extend to one side end of the dielectric film so as to be electrically connected to the first terminal portion,
The second extraction electrode portion of the second electrode pattern is formed to extend to the other side end of the dielectric film so as to be electrically connected to the second terminal portion. In film capacitors that have both self-healing function and self-protection mechanism
The second capacitor electrode portion of the first electrode pattern is separated into a plurality of first sections arranged along the width direction and the length direction of the dielectric film,
Of the plurality of first sections, the first section adjacent to the first capacitor electrode part and the first capacitor electrode part are connected via a narrow first fuse part,
Among the plurality of first sections, the first section adjacent to the first extraction electrode section and the first extraction electrode section are connected via a narrow second fuse section,
The plurality of first sections arranged along the width direction of the dielectric film are connected via narrow third fuse portions, respectively.
The plurality of first sections arranged along the length direction of the dielectric film are connected through narrow fourth fuse portions, respectively.
The fourth capacitor electrode part of the second electrode pattern is separated into a plurality of second sections arranged along the width direction and the length direction of the dielectric film,
Among the plurality of second sections, the second section adjacent to the third capacitor electrode part and the third capacitor electrode part are connected via a narrow fifth fuse part,
Among the plurality of second sections, the second section adjacent to the second extraction electrode section and the second extraction electrode section are connected via a narrow sixth fuse section,
The plurality of second sections arranged along the width direction of the dielectric film are connected via narrow seventh fuse portions, respectively.
The plurality of second sections arranged along the length direction of the dielectric film are connected to each other through a narrow eighth fuse part,
Ninth narrower than the first capacitor electrode part and wider than the first fuse part between the first extraction electrode part and the first capacitor electrode part of the first electrode pattern. A fuse part is formed,
A tenth narrower width than the second capacitor electrode portion and wider than the second fuse portion between the second extraction electrode portion and the second capacitor electrode portion of the second electrode pattern. A film capacitor in which a fuse portion is formed. The film capacitor according to claim 1,
The wound body includes a first dielectric film having the first electrode pattern formed on one side, a second dielectric film having the second electrode pattern formed on one side, the first electrode pattern and the A film capacitor, wherein the film capacitor is configured such that the first dielectric film and the second dielectric film are overlapped and wound so as not to contact the second electrode pattern. The film capacitor according to claim 1 or 2,
Both ends of the dielectric film in the width direction are each cut into a corrugated shape.

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