JP2568223Y2 - Resistor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resistor, and more particularly to a high-capacity resistor having a high withstand voltage suitable as a resistor for suppressing an inrush current generated in a vehicle starting motor circuit of an electric vehicle. The present invention provides a resistor.

[0002]

2. Description of the Related Art Generally, a vehicle starting motor circuit of an electric vehicle includes a motor (load) 25 and a main battery 2 as shown in FIG.
6, a relay 30 having a fuse 27, a motor drive switch 28, and an external signal input portion 29 is sequentially provided, and a resistor 3 is provided between the relay 30 and the motor 25.
1 and a condenser 32 is provided in parallel with the motor 25. By switching the relay 30, the resistor 31 is energized.

In the above circuit, as a measure against inrush current generated when the motor drive switch 28 is turned on, the capacitor 32 is charged through the resistor 31 when the circuit is connected, and after the potential difference between the main battery 26 and the capacitor 32 is reduced, Means is adopted in which the circuit of the relay 30 is switched by the external signal 29 and connected to the main circuit connected to the motor 25, thereby suppressing the rush current.

Conventionally, a resistor used for suppressing the inrush current at the time of circuit connection described above is required to have a high withstand voltage and a high capacity. Resistors are used to prevent abnormalities such as blown fuses, electric wire smoke, and relay contact welding due to inrush current.

[0005] Since the above-mentioned wound resistor does not take up a large space, it is not so large in capacity.
A wire wound resistor that can be guaranteed for a short time but cannot withstand continuous use for a long time is used. The main circuit which is switched by and does not pass through a resistor is connected.

[0006]

However, in the case of conventional wire wound resistors that are not so large in capacity, continuous use by the resistors themselves for a long time cannot be guaranteed. If not, a high load will be applied continuously, and the allowable capacity of the wound resistor will be exceeded, causing a problem such as melting. In addition, since the voltage at the time of the melting is high, there is a possibility that smoke and fire may be generated, and also explosive destruction may be caused, which is not preferable in terms of safety.

[0007]

According to the present invention, a semiconductor element having a positive temperature characteristic (hereinafter referred to as a "PTC element") is used in place of a conventional winding resistance for a resistor portion of a resistor. The above-mentioned problem is solved by utilizing the characteristics of the PTC element (the characteristic in which the resistance value suddenly changes when the temperature exceeds a certain specific temperature "Curie temperature").

That is, in the present invention , the glasses-type space is provided inside.
The glasses of case 1 having heat resistance and insulation provided with
A pair of glasses having conductivity and elasticity at the bottom of the mold space 2
The terminal plate 5 of the mold is provided, on its upper surface left, a multi several PTC element 7 having an ohmic electrode 8 is laminated placed so as not to contact with each other, the further the right and left laminated top on both sides, side The terminal plates 9, 9 having conductivity and elasticity provided with the terminals 10 in a protruding shape are mounted on the terminals 10, and the terminals 10 of the terminal plates 9, 9 are protruded outward from the case 1. sandwiched and heat resistance covered with a cover 13 having an insulating property, before the PTC element 7 are laminated Kifuku <br/> few left, and top of the terminal plate 9 and 9 and the terminal plate 5 of the bottom-most To keep the pressure
This is a high-voltage resistant high-capacity resistor characterized by fixing the case 1 and the cover 13.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of the resistor according to the present invention. In FIG. 1, reference numeral 1 denotes a ceramic case having heat resistance and insulation properties. And a screw hole 4 at each of the four corners.
Reference numeral 5 denotes a pair of eyeglass-shaped terminal plates that fits into the eyeglass-shaped space 2 of the case 1, and has a convex portion 6 formed by pressing at the center of the left and right circular portions. Reference numeral 7 denotes a P having ohmic electrodes 8 on both sides.
The diameter of the TC element is such that it fits into the left and right circular portions of the glasses-shaped space. 9 is a cutout 3 of the case on the side.
The terminal plate 9 has a protruding portion 11 formed by pressing at the center lower portion of the terminal plate 9, and the terminal 10 has a hole 12 for electrical connection. Reference numeral 13 denotes a heat-resistant and insulating ceramic cover similar to the case 1. The cover 13 has a projection 14 corresponding to the terminal plate 9 having the protruding terminal 10 on the lower surface, and the case 1 at four corners. It has a screw hole 15 corresponding to the screw hole 4. Reference numeral 16 denotes a mounting bracket made of a metal plate. The mounting bracket 16 has screw holes 17 corresponding to the screw holes 15 of the cover at four central corners, and has a mounting seat 19 having mounting holes 18 at two diagonal locations. . 20
Is a screw, 21 is a spring washer, and 22 is a nut.

[0010]

[Assembly procedure]

(1) The glasses-type terminal board 5 is placed in the glasses-type space 2 of the case 1. (2) a multi several PTC element 7, the same number stack placed on the right and left circular portion of the case 1. (3) The terminal plate 9 is placed on the left and right PTC elements 7 so that the terminal 10 is fitted into the notch 3 of the case 1. (4) In this state, the electrical leads to a one of the left and right top of the terminal plate 9 by Rifuku several PTC element 7, through the terminal plate 5 of the lowermost portion, the other double several PTC element 7 And is connected in series to the other terminal plate 9 at the top. (5) The cover 13 is put on the both terminal boards 9. (6) Place the mounting bracket 16 on the cover 13. (7) Screws 20 passed through the spring washers 21 are passed through the screw holes 17, 15, and 4 at the four corners, and are tightened and fixed with nuts 22 via the spring washers 21. (8) By the above procedure, as shown in FIG. 2, each of the left and right PTC elements 7 is in a state of holding the pressure by the upper and lower terminal plates 9, 9 and 5, and a high-capacity resistor having high voltage resistance is formed. can get.

[0011]

In a vehicle starting motor circuit for an electric vehicle,
In normal use, the inrush current when connecting the circuit is generally ms
Since the steady value is set in the ec order, the switching of the relay is performed in about one second and the main circuit is connected. The operation when the resistor according to the present invention is used in the above circuit is as follows.

First, the PTC due to the rush current at the time of circuit connection
As shown in Fig. 3, the current behavior of the device is as follows: After a large initial rise, the current rapidly attenuates due to a rapid increase in resistance due to self-heating. Can be.

Next, in the event of an abnormality such as when the relay is not switched, as described above, after a large current flows in the initial stage, the current is greatly attenuated, so that no large current flows thereafter and the circuit can be protected. .

[0014]

[Effect of the Invention] In the resistor according to the present invention, the PTC
By selecting and combining elements, a resistor having a desired capacity can be obtained, and the characteristics of the resistor are rapidly attenuated after a large initial current flows, so that the fuse is not easily blown by an inrush current. Further, even when the relay is not switched at the time of any abnormality, the characteristics of the PTC element are used, so that there is no danger of smoke or ignition due to the melting of the resistor. Therefore, although the resistor according to the present invention can be used for various applications, it is particularly suitable for a vehicle starting motor circuit of an electric vehicle.

Further, the resistor according to the present invention is extremely simple and small in structure, and the glasses-type space is provided inside the case.
Since it is provided, stacking and mounting of PTC elements is easy and
Since it is reliable and easy to assemble, it can be manufactured at low cost, and can be said to be extremely useful as a high-capacity resistor mounted in a narrow space such as an electric vehicle.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a resistor according to the present invention.

FIG. 2 is an upside-down vertical front view of the assembled state of the resistor according to the present invention.

FIG. 3 is a graph showing current behavior of a resistor using a PTC element.

FIG. 4 is a circuit diagram of a vehicle starting motor circuit in a conventional electric vehicle.

[Explanation of symbols]

1 Case 2 Glasses-type space 3 Notch
4 Screw hole 5 Terminal plate 6 Convex part 7 PTC element
8 Ohmic electrode 9 Terminal plate 10 Terminal 11 Convex part 1
2 hole 13 cover 14 convex part 15 screw hole 1
6 Bracket 17 Screw hole 18 Mounting hole 19 Mounting seat 2
0 screw 22 nut

Claims (1)

(57) [Scope of request for utility model registration] 1. A conductive and resilient eyeglass-shaped terminal plate 5 is provided at the bottom of a heat-resistant and insulating case 1 provided with an eyeglass-shaped space 2 therein. And ohmic electrodes 8 on both sides
And the double several PTC elements 7 are stacked placed so as not to contact with each other, further dependent on the needs of the laminated top, terminal plate having conductivity and elasticity having a terminal 10 to protrude to the side surface 9, 9 And place the terminals 10 of the terminal plates 9 and 9 on the case 1
From above in a state in which is projected outwardly from, covered with a cover 13 having an insulative heat resistance, the PTC element 7 that is laminated before Kifuku several lateral, top of the terminal plate 9 and 9 A high-voltage resistant high-capacity resistor characterized in that the case 1 and the cover 13 are fixed so as to hold the pressure between the case 1 and the terminal plate 5 at the bottom.