JP2007115726A - Capacitor device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a capacitor device which can be used in an environment of moisture prevention/high temperature/high humidity without extending peeling of a lead wire and a sealing material to a capacitor element, even if stress is applied to an input line or an output line using the lead wire of the capacitor element at the time of working. <P>SOLUTION: The capacitor device is provided with a capacitor main body 1, and input/ouptut terminals 2 and 3 connected to the capacitor main body. The capacitor main body 1 is provided with the capacitor elements 4, the input/output line 5 connecting the capacitor elements to the input/output terminals 2 and 3 and having bending parts 6 and 8, the sealing material 9 sealing the capacitor elements 4 and the input/output line 5 comprising at least the bending parts 6 and 8 and a cabinet 10 filled with the sealing material. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to moisture prevention of a capacitor device used in a hot and humid environment.

  Conventionally, the invention relating to moisture-proofing of capacitor devices has a capacitor element wrapped with a metallized film housed in a casing (case), and a resin laminated epoxy resin (silicone resin) is placed in the opening of the casing In order to seal the capacitor body, there is a case in which a casing is filled with urethane resin and cured (for example, see Patent Document 1).

Japanese Patent Laying-Open No. 2003-289011 (FIG. 1)

  However, the capacitor device described in Patent Document 1 is an invention that prevents the inflow of moisture into the housing by the resin laminated mica plate, and the input line or output line using the lead wire connected to the capacitor element has a linear structure. For this reason, when stress is applied to the lead wire during processing of the capacitor device, the lead wire and the sealing material are peeled off, creating a gap between them, and moisture flows from the gap. There is a problem in that the capacitor element absorbs moisture, the capacitance of the capacitor device changes, and the performance degradation such as an increase in dielectric loss tangent, which is a material constant of the capacitor element, and a decrease in insulation resistance occur.

  Further, Patent Document 1 merely shows the capacitance of the capacitor element due to the difference in resin structure and components of the resin laminated mica plate disposed in the opening of the housing. In the capacitor element having a lower resistance to moisture such as a mica capacitor than the wound capacitor element, there is a problem that the increase in the dielectric loss tangent and the decrease in the insulation resistance, which have a great influence, are not mentioned.

  The present invention has been made to solve the above-described problems, and even if stress is applied to the input line or output line using the lead wire of the capacitor element during processing, the lead wire and the seal are sealed. It is an object of the present invention to provide a capacitor device that can be used in a moisture-proof, high-temperature and high-humidity environment without peeling off from the sealing material and the capacitor element.

  The capacitor device according to the invention of claim 1 includes a capacitor body and an input / output terminal connected to the capacitor body, the capacitor body connects the capacitor element and the capacitor element to the input / output terminal, An input / output line having a bent portion, the capacitor element, a sealing material for sealing the input / output line including at least the bent portion, and a casing filled with the sealing material. It is.

  The capacitor device according to a second aspect of the present invention is the capacitor device according to the first aspect, wherein the bent portion is bent in a plane perpendicular to the bottom surface of the casing.

  The capacitor device according to a third aspect of the present invention is the capacitor device according to the first aspect, wherein the bent portion is bent in a horizontal plane with respect to a bottom surface of the casing.

  As described above, according to the first aspect of the present invention, even when stress is applied to the input line or the output line of the capacitor element, the separation between the input line or the output line and the sealing material for sealing is the capacitor element. Capacitor devices that do not reach the limit can be obtained.

  According to the second aspect of the present invention, it is possible to obtain a capacitor device that is miniaturized in the direction perpendicular to the bottom surface of the housing even if the input / output line is provided with a bent portion.

  According to the third aspect of the present invention, it is possible to obtain a capacitor device that is miniaturized in the direction of the horizontal plane with respect to the bottom surface of the housing, even if the input / output line is provided with a bent portion.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an external view of a capacitor device according to the embodiment, FIG. 2 is a cross-sectional view of the capacitor device according to the embodiment, FIG. 2A shows a single capacitor element, and FIG. 3 (parallel connection), FIG. 3 is a comparison diagram of material constants after evaluation of moisture resistance (moisture resistance performance) before and after moisture-proof measures for the capacitor device, FIG. 3 (a) is a capacitor device before moisture-proof measures, FIG. 3 (b) 4 is a comparison diagram of capacitance before and after moisture proof measures, FIG. 5 is a comparison diagram of dielectric loss tangent before and after moisture proof measures, and FIG. 6 is a comparison diagram of insulation resistance before and after moisture proof measures. 1 and 2, reference numeral 1 denotes a capacitor body, 2 denotes an input terminal connected to the capacitor body 1, 3 denotes an output terminal connected to the capacitor body, 4 denotes a capacitor element, and 5 denotes a capacitor element 1 as an input terminal 2. Input line to connect, 6 is input A bent portion formed on the input line 5 between the child 2 and the capacitor element 4, 7 is an output line connecting the capacitor element 1 to the output terminal 3, and 8 is an output between the output terminal 3 and the capacitor element 4. The bent portion formed on the line 7, 9 is a sealing material for sealing the capacitor element 4, the input line 5 including at least the bent portion 6, and the output line 7 including the bent portion 8, and 10 is the sealing material 9. It is a housing to be filled. In the drawings, the same reference numerals denote the same or corresponding parts, and detailed descriptions thereof are omitted.

  The capacitor body 1 of the capacitor device has an input terminal 2 and an output terminal which are input / output terminals, and the capacitor element 4 is housed in a housing 10 formed of resin, and a sealing material is provided in the housing 10. 9 is filled and fixed. The input line 5 and the output line 7 connected to the capacitor element 4 have bent portions 6 and 8 that are bent in a plane perpendicular to the bottom surface of the housing 10, and are connected to the input terminal 2 and the output terminal, respectively. Further, a plurality of capacitor elements may be connected side by side. In that case, as shown in FIG. 2 (b), capacitor elements 4 (a), 4 (b), 4 (c) are arranged in parallel and bent portions 6 (a), 6 (b), 6 (c) May be connected to the input / output terminal by the input line 5 having the above and the output line 7 having the bent portions 8 (a), 8 (b), 8 (c), or the capacitor elements 4 may be arranged in series. Such a configuration can be applied to a capacitor device having a large capacitance. The input / output terminals may be omitted by integrating the input / output terminals and the input / output lines.

  Next, description will be made on evaluation of moisture resistance (moisture resistance). In the capacitor device used for the evaluation, the capacitor element 4 was a 3 kV, 0.1 μF mica capacitor. As a sample for evaluation, three capacitor devices having one capacitor element 4 shown in FIG. 2A are manufactured as a capacitor device after taking measures against moisture and moisture, and the same capacitor element 4 is used and there is no bent portion. Three capacitors having straight (bar-shaped) input / output lines were manufactured to provide a capacitor device before taking measures against moisture and moisture. Note that even if the input / output lines are straight and the position of the opening of the housing 10 is different, the moisture resistance of the capacitor device is not affected.

  In the evaluation test, a heat shock test (−30 ° C./+60° C., 100 cycles each for 1 hour) was followed by a high temperature and high humidity test (85 ° C., 85% RH, 1000 hours). To confirm the performance of the capacitor device, we measured the material constants of capacitance, dielectric loss tangent, and insulation resistance. The timing of the measurement was before the start of the test, during the test, and after the test was completed. The measurement during the test was performed after 50 cycles in the case of heat shock, and approximately every 168 hours in the case of the high temperature and high humidity test. In addition, the capacitor device before the countermeasure was measured up to 672 hours, and the capacitor device after the countermeasure was measured up to 1000 hours. In the measurement during the test, the measurement was performed after taking out from the thermostat and leaving it for 2 hours or more. The test results are shown in FIG. In addition, the data before and after the countermeasures for the number of heat shock tests and the high-temperature and high-humidity test time are shown in Fig. 4, Fig. 5 and Fig. 6, respectively. A comparison diagram of dielectric loss tangent and a comparison diagram of insulation resistance before and after moisture-proof measures are shown. From FIG. 3, the measurement after the heat shock test is almost unchanged from the initial value both before and after the measure, but in the measurement after the high-temperature and high-humidity test, the performance is deteriorated due to the influence of moisture prevention. However, the magnitude of the performance deterioration is greatly improved in the capacitor after the countermeasure as compared with that before the countermeasure. That is, the capacitance increased about 3% before the countermeasure after the high-temperature and high-humidity test, but decreased to about 1% after the countermeasure. In addition, the dielectric loss tangent increased from 0.002 to 0.014 (7 times) before the countermeasure after the high temperature and high humidity test, but greatly improved from 0.003 to 0.006 (2 times) after the countermeasure. Yes. In addition, the insulation resistance decreased from 8000 MΩ to 17 MΩ before the countermeasure after the high temperature and high humidity test, resulting in an insulation failure. Further, as shown in FIG. 2 (b), a similar test was performed on a capacitor device in which a plurality of capacitor elements were connected side by side, and a similar high moisture resistance performance result was obtained.

  As a result of the evaluation test, in a capacitor device using a capacitor element whose performance is significantly deteriorated with respect to humidity such as mica, by providing a bent portion in the input / output line, when it is used for a long time in a high temperature and humidity environment, The speed of performance deterioration such as capacitance, dielectric loss tangent, insulation resistance, etc. can be suppressed compared to conventional products. That is, when the input / output line of the capacitor element 4 is bent in a plane perpendicular to the bottom surface of the housing 10 and a stress is applied to the input / output line at the time of processing the capacitor device, the linear portion of the input / output line Even if peeling occurs from the sealing material, it is difficult for stress to be applied after the bent portion, so that moisture can be prevented from entering up to the bent portion. Further, by making the input / output line flat, the adhesion between the input / output line and the sealing material is increased, and moisture resistance can be maintained even when external stress is applied to the input / output line.

Other Embodiments Another embodiment of the present invention will be described with reference to FIG. FIG. 7 is a perspective view of a capacitor device according to another embodiment, in which the same reference numerals denote the same or corresponding parts, and a detailed description thereof will be omitted. The capacitor device shown in FIG. 7 has bent portions 6 and 8 in which an input line 5 and an output line 7 connected to the capacitor element 4 are bent in a horizontal plane with respect to the bottom surface of the housing 10, respectively. And connected to. This can be applied when the thickness of the capacitor cannot be increased for mounting. Even when the input line of the capacitor element 4 is bent in a horizontal plane, the same effect as in the case of bending in the vertical plane can be obtained, and the capacitor device can be downsized.

1 is an external view of a capacitor device according to an embodiment of the present invention. It is sectional drawing of the capacitor | condenser apparatus by embodiment of this invention. FIG. 3 is a comparison diagram of material constants after evaluation of moisture resistance (moisture resistance) before and after moisture resistance measures for the capacitor device of the present invention. It is a comparison figure of the electrostatic capacitance before and after the moisture proof measures of this invention. It is a comparison figure of the dielectric loss tangent before and behind the moisture proof measures of this invention. It is a comparison figure of the insulation resistance before and behind the moisture proof measures of this invention. It is a perspective view of the capacitor | condenser apparatus by other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Capacitor main body, 2 ... Input terminal, 3 ... Output terminal, 4 ... Capacitor element, 5 ... Input line, 6 ... Bending part, 7 ... Output line, 8 ... Bending part, 9 ... Sealing material, 10 ... Housing

Claims (3)

A capacitor body; and an input / output terminal connected to the capacitor body. The capacitor body includes a capacitor element, an input / output line having the bent portion connected to the capacitor element, and the capacitor. The capacitor | condenser apparatus which has a sealing material which seals the said input / output track | line including an element and the said bending part at least, and the housing | casing filled with this sealing material. The capacitor device according to claim 1, wherein the bent portion is bent in a plane perpendicular to a bottom surface of the housing. The capacitor device according to claim 1, wherein the bent portion is bent in a horizontal plane with respect to a bottom surface of the housing.

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