JP4850793B2 - Capacitor layout - Google Patents

Description

  The present invention relates to a capacitor arrangement structure, and more particularly to a plurality of capacitor arrangement structures.

Conventionally, capacitor arrangement structures are disclosed in, for example, Japanese Patent Application Laid-Open No. 2004-186640 (Patent Document 1) and Japanese Patent Application Laid-Open No. 6-275471 (Patent Document 2).
JP 2004-186640 A JP-A-6-275471

The conventional capacitor arrangement structure has a problem of increased vibration.
Accordingly, the present invention has been made to solve the above-described problems, and provides a capacitor arrangement structure capable of preventing vibration of the arranged capacitor.

A capacitor arrangement structure according to one aspect of the present invention includes flat or rectangular first and second capacitor elements arranged so as to be adjacent to each other. The first and second capacitor elements are formed by laminating and winding a first insulating film, a cathode electrode, a second insulating film and an anode electrode, and having a shape in which a cylinder is crushed in a radial direction, A gap between the first and second capacitors is filled with a padding material, and the longitudinal direction of the first capacitor element and the longitudinal direction of the second capacitor element are parallel to each other, and the second capacitor element is The first capacitor element is disposed at a position shifted by half the length of the first capacitor element in the longitudinal direction .

  In the capacitor arrangement structure configured as described above, the first and second capacitor elements are arranged at a position shifted by half the length thereof, so that the first and second capacitor elements are prevented from vibrating as a unit. it can. As a result, the vibration of the capacitor can be reduced.

  Embodiments of the present invention will be described below with reference to the drawings. In the following embodiments, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

(Embodiment 1)
FIG. 1 is an electric circuit diagram showing a configuration of a main part of a load driving device in which the capacitor arrangement structure according to the first embodiment of the present invention is used. Referring to FIG. 1, load drive device 10 includes a converter 20, an inverter 30, a control device 40, capacitors C1 and C2, power supply lines PL1 to PL3, and output lines 62 to 66. Converter 20 is connected to battery B through power supply lines PL1 and PL3, and inverter 30 is connected to converter 20 through power supply lines PL2 and PL3. Inverter 30 is connected to motor generator MG as an electric load via output lines 62-66.

  The battery B is a direct current power source, and is a secondary battery such as a nickel metal hydride battery or a lithium ion battery. Battery B supplies the generated DC power to converter 20 and is charged by the DC power received from converter 20.

  Motor generator MG is, for example, a three-phase AC synchronous motor generator, and generates a driving force by AC power received from load driving device 10. The motor generator MG is also used as a generator, generates AC power by power generation action (regenerative power generation) during deceleration, and supplies the generated AC power to the load driving device 10.

  Converter 20 includes an upper arm and a lower arm each made of a semiconductor module, and a reactor L. The upper arm and the lower arm are connected in series between the power supply lines PL2 and PL3, and the upper arm connected to the power supply line PL2 includes a power transistor Q1 and a diode D1 connected in antiparallel to the power transistor Q1. The lower arm connected to the power supply line PL3 includes a power transistor Q2 and a diode D2 connected in antiparallel to the power transistor Q2. Reactor L is connected between power supply line PL1 and the connection point of power transistors Q1, Q2.

  Converter 20 boosts the DC current received from battery B using reactor L, and supplies the boosted boosted voltage to power supply line PL2. Converter 20 charges battery B with a DC voltage received from inverter 30.

  Inverter 30 includes a U-phase arm 52, a V-phase arm 54, and a W-phase arm 56. Each of U-phase arm 52, V-phase arm 54, and W-phase arm 56 is connected in parallel between power supply lines PL2 and PL3, and includes an upper arm and a lower arm made of semiconductor modules. The upper arm and the lower arm in each phase arm are connected in series between power supply lines PL2 and PL3.

  The upper arm of the U-phase arm 52 includes a power transistor Q3 and a diode D3 connected in antiparallel to the power transistor Q3. The lower arm of the U-phase arm 52 is antiparallel to the power transistor Q4 and the power transistor Q4. It consists of a connected diode D4. The upper arm of the V-phase arm 54 includes a power transistor Q5 and a diode D5 connected in antiparallel to the power transistor Q5. The lower arm of the V-phase arm 54 is antiparallel to the power transistor Q6 and the power transistor Q6. And a diode D6 connected to. The upper arm of W-phase arm 56 includes power transistor Q7 and diode D7 connected in antiparallel to power transistor Q7. The lower arm of W-phase arm 56 is antiparallel to power transistor Q8 and power transistor Q8. And a diode D8 connected to. The connection point of each power transistor in each phase arm is connected to the anti-neutral point side of the coil of the corresponding phase of motor generator MG via the corresponding output line.

  Inverter 30 converts a DC voltage received from power supply line PL2 into an AC voltage based on a control signal from control device 40, and outputs the AC voltage to motor generator MG. Inverter 30 rectifies the AC voltage generated by motor generator MG into a DC voltage and supplies it to power supply line PL2.

  First capacitor C1 is connected between power supply lines PL1 and PL3, and smoothes the voltage level of power supply line PL1. Second capacitor C2 is connected between power supply lines PL2 and PL3, and smoothes the voltage level of power supply line PL2.

  Control device 40 calculates each phase coil voltage of motor generator MG based on the torque command value of motor generator MG, each phase current value, and the input voltage of inverter 30, and power transistors Q3-Q8 are calculated based on the calculation result. A PWM (pulse width modulation) signal to be turned on / off is generated and output to the inverter 30. Here, each phase current value of motor generator MG is detected by a current sensor incorporated in a semiconductor module constituting each arm of inverter 30. This current sensor is disposed in the semiconductor module so as to improve the S / N ratio. Further, control device 40 calculates the duty ratio of power transistors Q1 and Q2 for optimizing the input voltage of inverter 30 based on the torque command value and the motor speed described above, and based on the calculation result, power transistor Q1. , Q2 is generated and output to the converter 20.

  Further, control device 40 controls switching operations of power transistors Q1 to Q8 in converter 20 and inverter 30 in order to convert AC power generated by motor generator MG into DC power and charge battery B.

  In load drive device 10, converter 20 boosts a DC voltage received from battery B based on a control signal from control device 40, and supplies the boosted voltage to power supply line PL2. Inverter 30 receives the DC voltage smoothed by second capacitor C2 from power supply line PL, converts the received DC voltage into an AC voltage, and outputs the AC voltage to motor generator MG.

  Inverter 30 converts the AC voltage generated by the regenerative operation of motor generator MG into a DC voltage and outputs the DC voltage to power supply line PL2. Converter 20 receives the DC voltage smoothed by capacitor C2 from power supply line PL, and steps down the received DC voltage to charge battery B.

  The capacitor device includes a first capacitor C1 and a second capacitor C2. A positive electrode (P pole) of the first capacitor C1 is connected to the power supply line PL1, and a negative electrode (N pole) is connected to the electric line PL3. The positive electrode (P pole) of second capacitor C2 is connected to power supply line PL2, and the negative electrode (N pole) of second capacitor C2 is connected to power supply line PL3.

  FIG. 2 is a perspective view of the capacitor shown in FIG. FIG. 3 is a plan view of the capacitor viewed from the direction indicated by arrow III in FIG. Referring to FIGS. 2 and 3, a first capacitor element 1a and a second capacitor element 1b are arranged in directions orthogonal to each other in a capacitor case 2a as a box. The direction in which the long side 21a of the first capacitor element 1a extends is the long side direction indicated by the arrow 11a. The direction in which the long side 21b of the second capacitor element 1b extends is the longitudinal direction indicated by the arrow 11b of the second capacitor element. Two first capacitor elements 1a are arranged with their long sides adjacent to each other, and a second capacitor element 1b is arranged next to the first capacitor elements 1a so as to extend in a direction orthogonal to the first capacitor element 1a. Two second capacitor elements 1b are adjacent to each other and contact the long sides 21b.

  The capacitor case 2a is provided with bus bars 3a and 3b. The bus bars 3a and 3b as electrodes are electrically connected to the first capacitor element 1a and the second capacitor element 1b, and electric power is transferred between the first capacitor element 1a and the second capacitor element 1b.

  In this embodiment, the structure of the first capacitor C1 is shown, but the second capacitor C2 has the same structure.

  The capacitor case 2a is filled with a potting material 4a. The potting material 4a functions to confine the first capacitor element 1a and the second capacitor element 1b in the capacitor case 2a.

  2 and 3, the capacitor case 2a has a quadrangular shape, but is not limited to this shape, and may be a circular shape or a polygonal shape.

  FIG. 4 is an exploded perspective view of one capacitor element. Referring to FIG. 4, first capacitor element 1a may be, for example, a film capacitor. Specifically, the first capacitor element 1a of the film capacitor has a shape in which an insulating film 113, a cathode electrode 114, an insulating film 113, and an anode electrode 115 are laminated. The insulating film 113 is made of a highly insulating material such as polyethylene terephthalate (PET) or polyethylene naphthalate (PEN). In addition, a relatively low dielectric constant film such as polypropylene (PB) can be used as the insulating film.

  As the cathode electrode 114 and the anode electrode 115, a material having a low electric resistance such as silver, aluminum, or copper can be used.

  FIG. 5 is a perspective view of the film capacitor. Referring to FIG. 5, film capacitor first capacitor element 1 a formed by being wound in the process shown in FIG. 4 has an upper surface 111 and a lower surface 112.

  FIG. 6 is a perspective view showing a process of deforming the capacitor element. Referring to FIG. 6, the side surface orthogonal to upper surface 111 and lower surface 112 is pressed in the direction indicated by the arrow. Thereby, the planar side surface 117 is formed, and the first capacitor element 1a has a flat shape. The first capacitor element 1a may be oval or rectangular. That is, the side surface is flattened by applying force to the first capacitor element 1a in the direction indicated by the arrow D.

  The first capacitor element 1a and the second capacitor element 1b are not necessarily film capacitors but may be electrolytic capacitors. Moreover, the 1st capacitor | condenser element 1a and the 2nd capacitor | condenser element 1b may be comprised with the ultra capacitor | condenser etc. other than a film capacitor.

In this embodiment, the shape is not flat, a plurality of first capacitor element 1a having a shape crushed circle column radially and 1b, the bus bar 3a for guiding input and output power, and 3b, and the capacitor bus bar therein A capacitor case 2a to be stored and a potting material 4a to fill these gaps are provided. The first capacitor element 1a and the second capacitor element 1b are not always oriented in the same radial direction in any row, but at least one of the rows in the capacitor case 2a is rotated 90 ° in the radial direction. Installed inside.

  When electric power including a fluctuation component for driving a motor of an electric vehicle is input to a capacitor, vibration is generated between the electrodes of the first capacitor element 1a and the second capacitor element 1b, and this vibration is transmitted to the capacitor case via the potting material 4a. 2a, noise may be generated, or the vibration of the capacitor case 2a may be transmitted to other components to generate vibration.

FIG. 7 is a perspective view of a capacitor according to a comparative example. FIG. 8 is a plan view seen from the direction indicated by the arrow VIII in FIG. 7 and 8 show a configuration according to the comparative example, and all the first capacitor elements 1a are arranged in the same direction. In such a configuration, since the arrangement directions of the first capacitor element 1a are all the same direction, the vibration of the first capacitor element 1 is transmitted to the capacitor case 2b without being canceled. On the other hand, in the configuration shown in FIGS. 2 and 3, the first capacitor and the second capacitor vibrate at the current drive frequency.

  FIG. 9 is a perspective view of the second capacitor element, and FIG. 10 is a side view seen from the direction indicated by the arrow A in FIG. Referring to FIG. 9 and FIG. 10, the capacitor element is arranged so that the contraction part in the X-axis direction and the expansion part in the Y direction are in contact with each other as shown in FIG. 10, and these vibrations cancel each other. Thereby, the vibration transmitted to the capacitor case 2a can be reduced. As a result, vibration from the capacitor case 2a is reduced, and vibration from the capacitor case 2a to other components is reduced.

  FIG. 11 is a perspective view of a capacitor arrangement structure according to another example. FIG. 12 is a plan view seen from the direction indicated by arrow XII in FIG. As shown in FIG. 11 and FIG. 12, when there is one each of the first capacitor element 1a and the second capacitor element 1b, that is, when there are two in total, one is installed by rotating 90 degrees in the radial direction. May be.

  FIG. 13 is a perspective view of a capacitor arrangement structure according to another aspect. FIG. 14 is a plan view seen from the direction indicated by the arrow XIV in FIG. As shown in FIGS. 13 and 14, when there are three capacitor elements, one capacitor element may be installed by rotating 90 ° in the radial direction.

  FIG. 15 is a perspective view of a capacitor arrangement structure according to another aspect. FIG. 16 is a plan view from the direction indicated by the arrow XVI in FIG. As shown in FIGS. 15 and 16, when there are four capacitor elements, the two may be installed by rotating 90 degrees in the radial direction. In the case of having four capacitor elements, it is effective for reducing vibrations to have the elements rotated by 90 ° in both the XY directions.

  FIG. 17 is a perspective view of a capacitor arrangement structure according to another aspect. FIG. 18 is a plan view seen from the direction indicated by arrow XVIII in FIG. As shown in FIGS. 17 and 18, an element capacitor rotated by 90 ° in the radial direction may be arranged in either one of the XY directions.

  The capacitor arrangement structure of the first embodiment includes flat or rectangular first or second capacitor elements 1a and 1b arranged so as to be adjacent to each other, and the longitudinal direction of the first capacitor element 1a is the second capacitor element 1b. First and second capacitor elements 1a and 1b are arranged so as to form an angle of 90 ° with respect to the longitudinal direction. The same number of the plurality of first capacitor elements 1a and the plurality of second capacitor elements 1b are arranged.

(Embodiment 2)
FIG. 19 is a perspective view of a capacitor arrangement structure according to the second embodiment of the present invention. 20 is a plan view seen from the direction indicated by the arrow XX in FIG. Referring to FIGS. 19 and 20, the first capacitor element 1 a and the second capacitor element 1 e can be shifted in the axial direction to reduce vibration. As described above, the principle of vibration reduction is such that the bulging part and the concave part in the Y-axis direction are adjacent to each other to cancel vibrations. The first capacitor element 1a and the second capacitor element 1e are arranged so as to extend in the same direction. Specifically, the direction in which the long side 21a of the first capacitor element 1a extends (longitudinal direction indicated by the arrow 11a of the first capacitor element 1a) and the direction in which the long side 21e of the second capacitor element 1e extends (second capacitor element). The second capacitor element 1e is arranged at a position shifted by half (L) of the length (2L) of the first capacitor element 1a.

  FIG. 21 is a perspective view of a capacitor arrangement structure according to another aspect. FIG. 22 is a plan view of the capacitor viewed from the direction indicated by arrow XXII in FIG. Referring to FIGS. 21 and 22, even when there are two capacitor elements, first capacitor element 1c and second capacitor element 1b are shifted from each other by a distance L in the axial direction.

  FIG. 23 is a perspective view of a capacitor element arrangement structure according to another aspect. FIG. 24 is a plan view seen from the direction indicated by arrow XXIV in FIG. Referring to FIGS. 23 and 24, an example is shown in which the number of capacitor elements is three and is shifted in the axial direction. The first capacitor element 1c and the second capacitor element 1b are arranged so as to be shifted by half the length of the first capacitor element 1c.

  FIG. 25 is a perspective view of a capacitor arrangement structure according to another aspect. FIG. 26 is a plan view seen from the direction indicated by XXVI in FIG. Referring to FIGS. 25 and 26, when there are four capacitor elements, they may be arranged so as to be shifted in the axial direction. 25 and 26, the two second capacitor elements 1e are arranged so as to be shifted from the first capacitor element 1a.

  FIG. 27 is a perspective view of a capacitor element arrangement structure according to another aspect. FIG. 28 is a plan view seen from the direction indicated by arrow XXVIII in FIG. Referring to FIGS. 27 and 28, only one second capacitor element 1e may be arranged at a position shifted from first capacitor element 1a.

  At this time, the shifted second capacitor element 1e may be any part of the four capacitor elements arranged in parallel.

  FIG. 29 is a perspective view of a capacitor arrangement structure according to another aspect. FIG. 30 is a plan view seen from the direction indicated by arrow XXX in FIG. Referring to FIGS. 29 and 30, a third capacitor element 1 f smaller than first capacitor element 1 a and second capacitor element 1 e may be provided. The third capacitor element 1f is provided at the end of the second capacitor element 1e. When the second capacitor element 1e is shifted with respect to the first capacitor element 1a, a gap is generated at the end portion. In order to fill this gap, a third capacitor element 1f is provided. That is, the capacitor elements to be used do not have to be the same size, and may be configured so as to cancel vibrations by installing so that the bulging portion and the concave portion are adjacent to each other. The long side 21f of the third capacitor element 1f is provided along the longitudinal direction indicated by the arrow 11f.

  The longitudinal direction of the first capacitor element 1a and the longitudinal direction of the second capacitor element 1b are parallel to each other, and the second capacitor element 1b has a length in the longitudinal direction of the first capacitor element 1a with respect to the first capacitor element 1a. It is arranged at a position shifted by half.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1 is an electric circuit diagram showing a configuration of a main part of a load driving device in which a capacitor arrangement structure according to Embodiment 1 of the present invention is used. It is a perspective view of the capacitor | condenser shown in FIG. FIG. 3 is a plan view of the capacitor viewed from a direction indicated by an arrow III in FIG. 2. It is a disassembled perspective view of one capacitor | condenser element. It is a perspective view of a film capacitor. It is a perspective view which shows the process of deform | transforming a capacitor | condenser element. It is a perspective view of the capacitor | condenser according to a comparative example. It is the top view seen from the direction shown by arrow VIII in FIG. It is a perspective view of a 2nd capacitor element. It is the side view seen from the direction shown by the arrow A in FIG. It is a perspective view of the arrangement structure of the capacitor according to another situation. It is the top view seen from the direction shown by arrow XII in FIG. It is a perspective view of the arrangement structure of the capacitor according to another situation. It is the top view seen from the direction shown by arrow XIV in FIG. It is a perspective view of the arrangement structure of the capacitor according to another situation. It is a top view from the direction shown by arrow XVI in FIG. It is a perspective view of the arrangement structure of the capacitor according to another situation. It is the top view seen from the direction shown by arrow XVIII in FIG. It is a perspective view of the capacitor | condenser arrangement structure according to Embodiment 2 of this invention. It is the top view seen from the direction shown by arrow XX in FIG. It is a perspective view of the arrangement structure of the capacitor according to another situation. It is the top view of the capacitor | condenser seen from the direction shown by arrow XXII in FIG. It is a perspective view of the arrangement structure of the capacitor according to another situation. It is the top view seen from the direction shown by arrow XXIV in FIG. It is a perspective view of the arrangement structure of the capacitor according to another situation. It is the top view seen from the direction shown by XXVI in FIG. It is a perspective view of the arrangement structure of the capacitor according to another situation. It is the top view seen from the direction shown by arrow XXVIII in FIG. It is a perspective view of the arrangement structure of the capacitor according to another situation. It is the top view seen from the direction shown by arrow XXX in FIG.

Explanation of symbols

  1a 1st capacitor | condenser element, 1b 2nd capacitor | condenser element, 3a, 3b Bus bar, 11a, 11b Arrow, 21a, 21b Long side.

Claims (1)

Comprising flat and rectangular first and second capacitor elements arranged adjacent to each other;
The first and second capacitor elements are formed by laminating and winding a first insulating film, a cathode electrode, a second insulating film and an anode electrode, and having a shape in which a cylinder is crushed in the radial direction. ,
The gap between the first and second capacitors is filled with podding material,
The longitudinal direction of the first capacitor element and the longitudinal direction of the second capacitor element are parallel to each other, and the second capacitor element has a length in the longitudinal direction of the first capacitor element with respect to the first capacitor element. Capacitor arrangement structure that is arranged at a position shifted by half .

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