JP7195734B2 - Resistors and capacitors with resistors - Google Patents

Description

The present invention relates to a resistor and a capacitor with a resistor for discharging a main circuit capacitor mounted on a motor control inverter device of an electric vehicle.

As shown in FIG. 2, conventionally, in an electric vehicle, an inverter device 11 is connected to a high voltage battery 12 in order to control a motor 15 as a power source. In order to reduce the voltage across the main circuit capacitor 13 mounted in the inverter device 11 to a target value within a predetermined time after turning off the power of the vehicle, the charge of the main circuit capacitor 13 is constantly discharged. A resistor 16 is provided.

Also, in the event of an electric vehicle collision, etc., the voltage across the main circuit capacitor 13 must be rapidly reduced to the target voltage. switch 19 is turned on.

As the normal discharge resistor 16 and the rapid discharge resistor 17, for example, a cement resistor 21 shown in FIG. 3 is used. The cement resistor 21 includes an insulating substrate (not shown), a film resistor element (not shown) printed on the insulating substrate, and a resistor for connecting the film resistor element in parallel to the main circuit capacitor 13 (see FIG. 2). The lead wires 22 and terminals 26, the porcelain case 23 that accommodates the insulating substrate, the film resistive element, and part of the lead wires 22 and is sealed with cement 24, and the porcelain case 23 is connected to the motor control inverter device 11 (see FIG. 2). ), and a bracket 25 mounted on the porcelain case 23 by claws 25a.

Since the cement resistor 21 can be attached at a position away from the main circuit capacitor 13 via the lead wire 22 and the terminal 26, there is no need to consider the effect on the main circuit capacitor 13, which is vulnerable to heat. The size can be reduced to the extent that the structure can be made smaller. However, in addition to the high manufacturing cost of the cement resistor 21 itself, it is also necessary to manually connect the terminals 26, which increases the installation cost.

On the other hand, a cement resistor 31 shown in FIG. 4 is used for the same purpose as the cement resistor 21 described above. The cement resistor 31 includes an insulating substrate (not shown), a film resistive element (not shown) printed on the insulating substrate, terminals 32 for connecting the film resistive element in parallel to the main circuit capacitor 13, an insulating A porcelain case 34 that accommodates the substrate, the film resistance element and part of the terminals 32 and is sealed with cement 33, and a through hole 35 for attaching the porcelain case 34 to the housing of the main circuit capacitor 13 (see FIG. 2) or the like. and

This cement resistor 31 eliminates the lead wire 22 of the cement resistor 21 and exposes the terminal 32 to the outside. The mounting cost can be kept lower than that of the container 21. - 特許庁However, in order to automatically attach the terminal 32 to the housing of the main circuit capacitor 13 or the like, it is necessary to improve the accuracy of the positional relationship between the terminal 32 and the through hole 35, and there is a problem that the manufacturing cost is higher than that of the cement resistor 21. rice field.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to reduce both the manufacturing cost and the mounting cost of a resistor or the like mounted in a motor control inverter device for an electric vehicle.

In order to achieve the above object, the present invention provides a resistor to be attached to a main circuit capacitor mounted in a motor control inverter device of an electric vehicle, comprising an insulating substrate made of a ceramic material, and printed on the insulating substrate, a film resistive element for discharging the charge of the main circuit capacitor; a circuit pattern printed on the insulating substrate so as to enable parallel connection of the film resistive element to the main circuit capacitor; and a plurality of through holes for mounting the insulating substrate to the housing of the main circuit capacitor .

Since the resistor according to the present invention is formed by printing the film resistive element and the circuit pattern on the surface of the insulating substrate, the manufacturing cost can be significantly reduced as compared with the conventional resistor. In addition, since the terminals of the circuit pattern can be connected to the terminals on the main circuit capacitor side provided on the housing of the main circuit capacitor by soldering or the like using an automatic mounting machine line or the like, the installation cost can be kept low. . Furthermore, since the heat generated in the film resistance element is released to the outside as it is, the influence on the heat-sensitive main circuit capacitor can be minimized and the size of the resistor can be reduced. In addition, since the resistor has a plurality of through-holes formed in the insulating substrate for mounting the insulating substrate to the housing of the main circuit capacitor, the plurality of through-holes can be utilized by an automatic mounting machine. A line or the like may be used to secure the resistor to the housing of the main circuit capacitor.

Further, the resistor may include an overcoat that covers the film resistance element and the circuit pattern, and the overcoat can protect the film resistance element and the circuit pattern.

Furthermore, the resistor may include a plurality of film resistive elements, and the circuit pattern may include a plurality of terminals for connection to the main circuit capacitor.

Further, the present invention is a capacitor with a resistor, characterized in that any one of the resistors described above is attached to the housing of the main circuit capacitor. This makes it possible to provide a resistor-equipped capacitor with low manufacturing and mounting costs.

As described above, according to the present invention, it is possible to reduce both the manufacturing cost and the mounting cost of resistors and the like mounted on the motor control inverter device of an electric vehicle.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the resistor concerning this invention, Comprising: (a) is a top view, (b) is a bottom view, (c) is a right side view. 1 is a schematic circuit diagram for explaining the configuration of a motor control inverter device for an electric vehicle; FIG. It is a figure which shows the conventional resistor, (a) is a top view, (b) is a bottom view, (c) is a right side view. It is a figure which shows the conventional resistor, (a) is a top view, (b) is a bottom view, (c) is a right side view.

Next, a mode for carrying out the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of a resistor according to the present invention. This resistor 1 includes an insulating substrate 2, a film resistance element 3 as a constant discharge resistance printed on the surface 2a of the insulating substrate 2, A circuit pattern 4 for connecting the film resistive element 3 in parallel to a main circuit capacitor mounted in a motor control inverter device, an overcoat 5 covering the film resistive element 3 and a part of the circuit pattern 4, and a resistor 1 as main components. and a through hole 6 for attachment to a circuit capacitor housing (not shown).

The insulating substrate 2 is made of an insulating material such as ceramic in the form of a rectangular flat plate. Further, through holes 6 are formed on both left and right sides of the insulating substrate 2, and through holes 7 are formed inside the terminal portions 4a to 4d of the circuit pattern 4. As shown in FIG. The through holes 6 and 7 are formed in the soft state of the insulating substrate 2 before firing, and the film resistance element 3 and the circuit pattern 4 are printed after firing.

The film resistance element 3 functions as the constant discharge resistance 16 (see FIG. 2), and its resistance value is, for example, about 100 kΩ.

The circuit pattern 4 is made of silver, copper, nickel, or the like, and has a plurality of terminals 4a to 4d, two or more, at both ends of the film resistance element 3. FIG.

The overcoat 5 covers the surfaces of the film resistance element 3 and the circuit pattern 4 in order to protect them, and is formed by applying a glass paste or the like and then curing it.

As described above, the through holes 6 are formed in the insulating substrate 2 in a soft state before baking, and accurate positioning is possible even after baking. It can be fixed to the capacitor housing (not shown).

The resistor 1 having the above configuration has a simple configuration in which the film resistance element 3 and the circuit pattern 4 are printed on the surface of the insulating substrate 2, and the mounting through holes 6 are drilled. Since there is no need to fill the cement resistors 21 and 31, the manufacturing cost can be greatly reduced.

When the resistor 1 is attached to the housing of the main circuit capacitor, an automatic mounting machine line is used to insert a protrusion made of resin or the like protruding from the housing side into the through hole 6, and then the top portion protruding from the through hole 6 is inserted. are fixed to the insulating substrate 2 by melting or the like, and the terminal portions 4a to 4d of the circuit pattern 4 are connected to terminals on the main circuit capacitor side provided in the housing of the main circuit capacitor by soldering or the like. As a result, the fixing and terminal connection of the resistor 1 can be automatically performed, and the mounting cost can be kept low.

In the above embodiment, the surface 2a of the insulating substrate 2 is provided with the film resistance element 3 as a constant discharge resistance. film resistor elements may be provided. Also, a plurality of film resistive elements 3 may be provided.

1 resistor 2 insulating substrate 2a surface 3 film resistor element 4 circuit patterns 4a to 4d terminal portion 5 overcoats 6, 7 through hole

Claims (4)

A resistor attached to a main circuit capacitor mounted in a motor control inverter device of an electric vehicle,
an insulating substrate made of a ceramic material;
a film resistive element printed on the insulating substrate for discharging the main circuit capacitor;
a circuit pattern printed on the insulating substrate to enable parallel connection of the film resistive element to the main circuit capacitor ;
and a plurality of through holes formed in the insulating substrate for mounting the insulating substrate to the housing of the main circuit capacitor . 2. The resistor of claim 1, further comprising an overcoat covering said film resistive element and said circuit pattern. 3. The resistor according to claim 1 , wherein a plurality of said film resistive elements are provided, and said circuit pattern is provided with a plurality of terminal portions for connection to said main circuit capacitor. 4. A capacitor with a resistor, wherein the resistor according to claim 1 is mounted in a housing of said main circuit capacitor.

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