JP2016162808A - Discharge resistor integrate capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a discharge resistor integrated capacitor which allows for compaction of the circuitry of a device such as an inverter.SOLUTION: A discharge resistor integrated capacitor includes a smoothing capacitor C10 connected between the positive and negative electrodes of a DC power supply B and smoothing the DC power, and a discharge resistor R10 connected in parallel with the smoothing capacitor, and discharging the charges stored in the smoothing capacitor. The discharge resistor is constituted of a flat type conductor 6A provided on a dielectric plate 5 disposed on one side of a capacitor case 16 for housing the smoothing capacitor. The opposite side 5b to the side 5a of the dielectric plate provided with the resistor part is disposed to abut against a predetermined conductive member (housing 100).SELECTED DRAWING: Figure 4

Description

  The present invention relates to a discharge resistor integrated capacitor in which a discharge resistor is provided integrally with a capacitor.

  In an inverter device mounted on an electric vehicle or the like, various technologies relating to an electric device having a circuit configuration using a smoothing capacitor, a discharge resistor, and a Y capacitor have been proposed (for example, Patent Document 1).

  In the device (inverter noise removal device) according to Patent Document 1 below, a pair of capacitors (same as above) that removes a high-frequency component leaking to the smoothing capacitor C1, the discharge resistor R1, and the smoothing circuit 501 that removes low-frequency components at the midpoint grounding. 2A, 2B) shown in the literature FIGS. 1 and 2 are arranged.

Japanese Patent Laid-Open No. 2005-12908

  In the apparatus according to the above-described prior art, a space for installing such a capacitor is required, which hinders downsizing the circuit unit.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a discharge resistance integrated capacitor capable of downsizing a circuit unit of a device such as an inverter.

  In order to achieve the above object, a discharge resistor integrated capacitor according to the present invention includes a smoothing capacitor connected between the positive and negative electrodes of a DC power source for smoothing DC power, and connected in parallel to the smoothing capacitor, A discharge resistor for discharging the charge accumulated in the battery, a cooler having a conductive material and grounded to the vehicle body, and an insulating plate interposed between the discharge resistor and the cooler. Is the gist.

  In the present invention, since an insulating plate is interposed between the discharge resistor and the cooler, a parasitic capacitance is formed between the discharge resistor and the cooler. By using this parasitic capacitance as a Y capacitor, the installation area for the Y capacitor can be reduced and the circuit unit can be further downsized as compared with the case where the Y capacitor is constituted by another member.

It is a perspective view which shows the structural example of the discharge resistance integrated capacitor which concerns on 1st Embodiment. It is a perspective view which shows the principal part of the discharge resistance integrated capacitor which concerns on 1st Embodiment. It is a top view which shows the structural example of the conductor pattern applied to the discharge resistance integrated capacitor which concerns on 1st Embodiment. It is sectional drawing which shows the principal part of the discharge resistance integrated capacitor which concerns on 1st Embodiment. It is a top view which shows the other structural example of the conductor pattern applied to the discharge resistance integrated capacitor which concerns on 1st Embodiment. It is a circuit diagram which shows the example of a circuit to which the discharge resistance integrated capacitor which concerns on 1st Embodiment is applied. It is a perspective view which shows the principal part of the discharge resistance integrated capacitor which concerns on 2nd Embodiment. It is sectional drawing which shows the principal part of the discharge resistance integrated capacitor which concerns on 2nd Embodiment.

  Hereinafter, an embodiment as an example of the present invention will be described in detail with reference to the drawings. Here, in the accompanying drawings, the same reference numerals are given to the same members, and duplicate descriptions are omitted. In addition, since description here is the best form by which this invention is implemented, this invention is not limited to the said form.

[Discharge Resistor Integrated Capacitor According to First Embodiment]
With reference to FIG. 1 to FIG. 6, a configuration example of a discharge resistor integrated capacitor 1A according to the first embodiment will be described.

  Here, FIG. 1 is a perspective view showing a configuration example of a discharge resistor integrated capacitor 1A according to the first embodiment, and FIG. 2 is a perspective view showing an essential part thereof.

  First, a discharge resistor integrated capacitor 1A according to the first embodiment is connected between positive and negative electrodes of a DC power source B (see FIG. 6) via a positive electrode 3 and a negative electrode 2 to smooth DC power. A smoothing capacitor C10 and a resistance unit 150 (see FIG. 2) that is connected in parallel to the smoothing capacitor C10 and constitutes a discharge resistor R10 (see FIG. 6) that discharges the electric charge accumulated in the smoothing capacitor C10 are provided.

  The smoothing capacitor C10 includes, for example, a plurality of capacitors (capacitors) connected in parallel, and the capacitors are accommodated in an insulating resin case (capacitor case) 16.

  The entire discharge resistor integrated capacitor 1A is housed in a casing 100 made of a conductive material such as metal.

  Further, the negative electrode 2 is grounded to the housing 100 via the conductor 15.

  Here, the structural example of the resistance part 150 which comprises the discharge resistance R10 is demonstrated with reference to FIGS.

  3 is a plan view showing a configuration example of a conductor pattern 6A as a kind of flat conductor applied to the discharge resistor integrated capacitor 1A, and FIG. 4 is a cross-sectional view showing a main part of the discharge resistor integrated capacitor 1A. FIG.

  In the example shown in FIGS. 1 to 3, the resistor 150 is formed of an epoxy resin or the like disposed on one surface of the capacitor case 16 that houses the smoothing capacitor C10 (in the example shown in FIG. 1, the lower surface of the capacitor case 16). The conductive pattern 6A is provided on the insulating plate 5.

  The conductor pattern 6A is, for example, a meandering pattern as shown in FIG. 3, and is composed of an etched thin film such as copper or aluminum.

  Instead of the conductor pattern 6A, a flat plate member formed by cutting a copper plate or an aluminum plate may be stuck on the insulating plate 5 or the like.

  Further, the resistance value of the resistor portion 150 formed of the conductor pattern 6A or the flat plate member can be set to, for example, about 60 kΩ, and the discharge resistor R10 that discharges the electric charge accumulated in the smoothing capacitor C10 at about 10 mA (FIG. 6). Reference).

  In FIG. 3, a high resistance portion having a higher electrical resistance than other portions may be arranged in the central portion 6 </ b> Aa of the conductor pattern 6 </ b> A surrounded by a virtual line. The high resistance portion can be formed, for example, by forming the conductive pattern 6A in the central portion 6Aa with a high resistance material, or by reducing the thickness of the conductive pattern 6A only in the central portion 6Aa.

  Thereby, the time constant to the DC power line 503 (see FIG. 6) can be reduced, and high-frequency noise can be reduced.

  Thus, in the discharge resistor integrated capacitor 1A according to the present embodiment, the discharge resistor R10 serves as the resistor portion 150 provided on the insulating plate 5 disposed on one surface of the capacitor case 16 that houses the smoothing capacitor C10. Since it is composed of the conductor pattern 6A (or flat plate member), the installation area in the circuit portion of various devices such as an inverter is reduced compared with the case where the discharge resistance is a separate member as in the prior art. The size of the part can be reduced.

  On the other hand, as shown in FIGS. 2 and 4, the discharge resistor integrated capacitor 1A according to the present embodiment has a surface 5b opposite to the surface 5a on which the resistance portion 150 (conductor pattern 6A) of the insulating plate 5 is provided. Since the conductive pattern 6A and the casing 100 are disposed close to each other with the insulating plate 5 in between, the conductive pattern 6A and the casing 100 are disposed in contact with a predetermined conductive member (the bottom surface of the conductive casing 100 in the example shown in FIG. 4). A parasitic capacitance is formed between the conductor pattern 6A and the bottom surface of the housing 100.

  By using this parasitic capacitance as the Y capacitor CY in the circuit section of the device (inverter) as shown in FIG. 6, compared to the conventional case where the Y capacitors C2a and C2b are formed of separate members, The circuit area can be further reduced by reducing the installation area for the capacitor. Details of the circuit diagram shown in FIG. 6 will be described later.

The insulating plate 5 on which the conductor pattern 6A is installed can be made of a predetermined dielectric such as a SiO ₂ material.

  In this case, the capacitance value of the parasitic capacitance can be increased, and noise can be reduced more effectively.

  Further, as shown in FIGS. 2 and 4, the discharge resistor integrated capacitor 1A according to the present embodiment has a surface 5b opposite to the surface 5a on which the resistance portion 150 (conductor pattern 6A) of the insulating plate 5 is provided. Is disposed in contact with the bottom surface or the like of the conductive casing 100, so that the smoothing capacitor C10 or the like can be cooled (heat radiation) through the casing 100 or the like. That is, in this configuration example, the housing 100 itself also serves as a cooler.

  Instead of the conductor pattern 6A, a conductor pattern 6B having a central portion 6Ba as shown in FIG. 5 thicker than other portions may be used.

  As a result, the parasitic capacitance can be further increased, and noise can be effectively reduced.

  Here, a circuit example of an inverter 500A using the discharge resistor integrated capacitor 1A having the above-described configuration will be described with reference to FIG.

  As shown in FIG. 6, the inverter 500 </ b> A includes a DC smoothing circuit 501 connected to a battery B as a DC power source mounted on a vehicle, and a U phase, a V phase, and a W phase of the motor M and the generator G connected in parallel thereto. The three-phase AC conversion circuit 502 is connected to the other winding.

  Then, a separately arranged motor control device is controlled based on a control signal output to the signal circuit of the inverter 500B. During power running, a direct current supplied from the battery B via the direct current power line 503 is converted into U, V , W are converted into currents of respective phases, and the respective currents are sent to the three-phase coils of the motor M and the generator G through the three-phase AC power line 504.

  Further, during power generation or regeneration, the currents of the U, V, and W phases generated in the three-phase coils of the motor M and the generator G are supplied via the three-phase AC power line 504, which is converted into a DC current. It acts as a converter that sends it to the battery B via the DC power line 504.

  In such a circuit configuration, in the smoothing circuit 501A connected to the DC power line 503, the smoothing capacitor C10 that removes the low-frequency component, the discharge resistor R10, and the high-frequency component that leaks to the smoothing circuit 501A are removed by midpoint grounding. A Y capacitor CY is arranged.

  Here, in FIG. 6, the constituent members “smoothing capacitor C10”, “discharge resistor R10”, and “Y capacitor CY” corresponding to the part surrounded by the broken line are constituted by the discharge resistor integrated capacitor 1A according to the present embodiment. can do.

  Therefore, compared with the conventional case where the discharge resistor R1 and the Y capacitors C2a and C2b are separate members, the installation area in the circuit unit of various devices such as inverters can be reduced and the circuit unit can be downsized. As a result, it is possible to contribute to the miniaturization of the inverter itself and the miniaturization of a vehicle or the like on which the inverter is mounted.

[Discharge Resistor Integrated Capacitor According to Second Embodiment]
With reference to FIG. 7 and FIG. 8, a configuration example of the discharge resistor integrated capacitor 1B according to the second embodiment will be described.

  Here, FIG. 7 is a perspective view showing the main part of the discharge resistance integrated capacitor 1B according to the second embodiment, and FIG. 8 is a cross-sectional view showing the main part of the discharge resistance integrated capacitor 1B.

  In addition, about the structure similar to 1 A of discharge resistance integrated capacitors 1A which concerns on 1st Embodiment, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  In the discharge resistor integrated capacitor 1B according to the second embodiment, a cooler 200 is provided on the back surface 5b side of the insulating plate 5, as shown in FIGS.

  The cooler 200 is configured by a water cooling jacket, an air cooling jacket, or the like formed of a conductive material such as copper or aluminum.

  The cooler 200 can be fixed to a vehicle body 300 such as an electric vehicle.

  According to the discharge resistance integrated capacitor 1B according to the present embodiment, as with the discharge resistance integrated capacitor 1A according to the first embodiment, the installation area in the circuit unit of various devices such as an inverter is reduced. The circuit portion can be reduced in size.

  Moreover, since the surface 5b opposite to the surface 5a provided with the resistance portion 150 (conductor pattern 6A) of the insulating plate 5 is disposed in contact with the conductive cooler 200, the conductor pattern 6A, the cooler 200, and A parasitic capacitance is formed between the two.

  By using this parasitic capacitance as the Y capacitor CY in the circuit section of the device (inverter) as shown in FIG. 6, the Y capacitors C2a and C2b are formed as separate members as in the prior art. Thus, the installation area for the Y capacitor can be reduced, and the circuit portion can be further miniaturized.

  In addition, as shown in FIGS. 7 and 8, the discharge resistor integrated capacitor 1B according to the present embodiment has a surface 5b opposite to the surface 5a on which the resistance portion 150 (conductor pattern 6A) of the insulating plate 5 is provided. Since it is disposed in contact with the cooler 200 composed of a water cooling jacket, an air cooling jacket, or the like, the smoothing capacitor C10 or the like can be efficiently cooled (heat radiation).

  In place of the conductor pattern 6A, a conductor pattern 6B as shown in FIG. 5 may be used, or a flat plate member formed by cutting a copper plate or an aluminum plate may be used.

  Although the invention made by the present inventor has been specifically described based on the embodiments, the embodiments disclosed herein are illustrative in all respects and are not limited to the disclosed technology. Should not be considered. That is, the technical scope of the present invention should not be construed restrictively based on the description in the above embodiment, but should be construed according to the description of the scope of claims. All the modifications within the scope of the claims and the equivalent technique to the described technique are included.

1A, 1B ... Discharge resistor integrated capacitor B ... DC power supply (battery)
C10: Smoothing capacitor CY: Y capacitor R10: Discharge resistance 2 ... Negative electrode 3 ... Positive electrode 5 ... Insulating plate 6A, 6B ... Conductor pattern (flat plate conductor)
6Aa, 6Ba ... Central part 15 ... Conductor 16 ... Capacitor case 100 ... Housing 150 ... Resistor part 200 ... Cooler 300 ... Car body 500A ... Inverter

Claims (5)

A smoothing capacitor (C10) connected between the positive and negative electrodes of the DC power supply (B) to smooth the DC power;
A discharge resistor (R10) connected in parallel to the smoothing capacitor to discharge the charge accumulated in the smoothing capacitor;
A cooler (200) having a conductive material and grounded to the vehicle body (300);
An insulating plate (5) interposed between the discharge resistor (R10) and the cooler (200);
A discharge resistor integrated capacitor, comprising:   The discharge according to claim 1, wherein a capacitor is formed by the discharge resistor (R10), the insulating plate (5) and the cooler (200) when the discharge resistor (R10) is energized. Resistor integrated capacitor. The smoothing capacitor is housed in an insulating capacitor case (16),
The discharge resistance integrated capacitor according to claim 1 or 2, wherein the discharge resistance is formed by a conductor pattern (6A) disposed on a lower surface side of the capacitor case.   The discharge resistance integrated capacitor according to any one of claims 1 to 3, wherein the insulating plate is made of a predetermined dielectric.   5. The discharge resistance integrated capacitor according to claim 3, wherein a high resistance portion having a higher electric resistance than other portions is disposed in the central portion (6 Aa) of the conductor pattern.

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