JPH0445362Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a storage box that is provided under the floor of an electric car and houses various control devices for the electric car.

[Prior Art] A storage box for a VVVF inverter device (PWM type VVVF inverter device), which is an underfloor storage box for a control device in a conventional electric vehicle, will be described.

The conventional VVVF inverter device (PWM type VVVF inverter device) for electric vehicles has U,
Inverter units for each of the three-phase V and W phases and gate control units for these inverter units are assembled together with a filter reactor, a chopper control device for dynamic brakes, and a gate control unit of the chopper control device for dynamic brakes. They are stored in separate storage boxes, and are installed on both sides of the electric car's moving direction under the floor of the electric car. The width of these storage boxes is approximately 1/3 of the vehicle body width. Wiring between each storage box is done after each storage box is attached to the vehicle body. Therefore, this is shown in the figure and explained.

First, Figure 4 shows the VVVF in the case of a centralized filter reactor, which has been widely used in the past.
A main circuit connection diagram of the inverter device is shown. In the figure, 1 is a breaker, 2 is a centralized filter reactor, and 3U, 3V, 3W are VVVF
These are inverter sections for each of the U, V, and W phases of the inverter device, and are each composed of a filter capacitor 4U and a thyristor 5U, a filter capacitor 4V and a thyristor 5V, and a filter capacitor 4W and a thyristor 5W. 6 is a dynamic brake resistor, and 7 is a chopper control device for the dynamic brake. Also,
PP, P ₀ , P are the specified lines on the high voltage side of the DC power supply, N is the neutral line of the DC power supply, U, V, W
indicate the U-phase line, V-phase line, and W-phase line of AC, respectively. That is, the DC sent to the DC power supply line P is transmitted to the inverter sections 3U and 3 of each U, V, and W phase.
It is converted into three-phase alternating current by V and 3W. Further, FIGS. 5a and 5b show an example of a structural diagram of a storage box for a conventional VVVF inverter device mounted under the floor of the body of an electric vehicle. Figure 5a is a side view of the electric car as seen from the direction of movement;
is the vehicle body, 21 is the underfloor surface of the vehicle body 20, 30 and 32 are storage boxes provided on both sides of the lower part of the vehicle body 20,
50 is a common bus bar using the Giso electric wire toy method,
The main circuit DC power supply voltage bus N of this common bus 50,
P ₀ , P, B and AC power side three-phase U, V, W phase bus lines U, V, W correspond to lines with the same symbols in FIG. 4. Reference numeral 51 denotes a connection line that connects the devices in each storage box and the common bus. Moreover, Fig. 5b is a plan view seen from below of the electric car, and 30, 32, 34
and 36 are storage boxes, and 50 is a common bus bar. The storage box 30 houses filter capacitors 4U, 4V, 4W and thyristors 5U, 5V, 5W that constitute the inverter sections 3U, 3V, 3W of the VVVF inverter device.
A gate control section 8 (not shown in FIG. 4) for these thyristors 5U, 5V, and 5W is housed in the . The storage box 34 also includes a power generation brake chopper control device 7 and a gate control section 9 thereof.
(not shown in Figure 4) is, and the storage box 3
6 house filter reactors 2, respectively. Note that each device in these storage boxes 30 to 36 is connected to a predetermined bus bar of the common bus bar 50 for each storage box by the connection line 51 after the storage boxes 30 to 36 are installed, as described above. , the wiring shown in FIG. 5b conceptually shows this.

[Problems to be solved by the invention] As mentioned above, in conventional electric cars, various control devices for electric cars installed under the floor of the car body are stored separately in several storage boxes. Ta. When wiring between storage boxes using this separate box method, especially when the harmonic current component is large and the operating frequency is high, such as in a VVVF inverter device, such a separate box method is recommended. However, due to the long wiring, there was a problem with stability of operation. Furthermore, there is a problem in that the harmonic current component becomes large and causes an induction disturbance to other equipment, especially to various signal equipment distributed on the ground.

This idea was devised to solve these problems, and was designed to stabilize the operation of control devices with high operating frequencies, and to provide guidance to various signal equipment, etc. distributed on the ground by such control devices. The object of the present invention is to provide an underfloor storage box for a control device in an electric vehicle that reduces interference.

[Means for Solving the Problems] In view of the above-mentioned objectives, this invention provides various control devices for electric cars provided under the floor of the body of the electric car on both sides of the electric car in the direction of movement of the electric car. A storage box that stores a common bus bar extending along the moving direction of the electric car in the center of the underfloor and interconnecting the various control devices, and connection lines connecting these common bus bars and the various control devices, the storage box having a side surface. The side surface portion extends approximately the same width as the vehicle body so as to integrally cover the various control devices and the common bus bar from the surrounding side surface, and the top surface portion has a top surface portion and a bottom surface portion. The space between the underfloor surface of the vehicle and the various control devices and the common bus bar extends approximately the same width as the vehicle body so as to cover the various control devices and the common bus bar from above. The side surface portion has a shield structure that extends over the entire surface to cover the bus bar and the connection wire from below to approximately the same width as the width of the vehicle body, and blocks electrical noise generated therefrom; The present invention is provided in an underfloor storage box for a control device in an electric vehicle, which integrally stores the various control devices, a common bus bar, and a connection line through a top surface and a bottom surface.

[Function] In this invention, various control devices installed under the floor of the electric car body, a common bus bar, and the connecting wires connecting these are integrated into one storage box having approximately the same width as the car body. This allows the wiring between each part to be shortened. In addition, the entire bottom of the storage box has a shield structure to block electromagnetic waves, which blocks electrical noise generated by control equipment, etc., and drastically reduces the influence of induced disturbances on each ground equipment. . In addition, by wiring the common bus in the upper center of the storage box and increasing the distance between the common bus and ground equipment, the effects of induction disturbances can be further reduced.

[Example] Figures 1a and 1b show an example of an underfloor storage box for a control device in an electric car of this invention.
FIG. 1A is a side view of the storage box of the VVVF inverter device, and FIG. 1B is a side view of the electric vehicle as seen from the moving direction, and FIG. 1B is a plan view of the electric vehicle as viewed from below. In both figures, 38 is a storage box that integrally houses the inverter section of the VVVF inverter device, its gate control section, the dynamic brake chopper control device and its gate control section, and the common bus and connection wires that connect these. , its width is approximately equal to the width of the vehicle body 20. 38a is a storage box 38
This bottom surface portion 38a has a shield structure that blocks electromagnetic waves over the entire surface. Further, 38b indicates a side surface portion, and 38c indicates a top surface portion. Other parts are the same as the conventional one.

As shown in FIG. 1b, inside the storage box 38, the U-phase filter capacitor 4U and thyristor 5U of the VVVF inverter device, the V-phase filter capacitor 4V and thyristor 5V are on one side, and the W-phase filter is on one side. A capacitor 4W, a thyristor 5W, a gate control section 8 for each phase's thyristors 4U, 4V, and 4W, and a dynamic brake chopper control device 7 and its gate control section 9 are arranged on the other side. Further, as can be seen from FIGS. 1a and 1b, the common bus bar 50 is connected to this storage box 3.
The filter capacitor 4, which is the main circuit part of the VVVF inverter device, is wired in the upper center of the VVVF inverter device.
U, 4V, 4W, thyristor 5U, 5V, 5W,
The dynamic brake chopper control device 7 is connected to a predetermined busbar of the common busbar 50 by a connection line 51. These connection lines 51 can be short because the various devices and busbars are housed in one storage box.

Furthermore, as another embodiment, a storage box in which a filter reactor is also housed will be described. Conventionally,
The filter reactor was placed in a separate position in a centralized manner as can be seen in FIGS. 4 and 5b. In this embodiment, the filter reactor is also divided into three equal parts, distributed in U, V, and W phases, and housed together with the VVVF inverter device and the dynamic brake chopper control device in one storage box. Therefore, FIG. 2 shows a main circuit connection diagram of a VVVF inverter device when the filter reactor is of a distributed type. In Fig. 2, the difference from the conventional main circuit connection diagram in Fig. 4 is that the split filter reactor 2U,
Other parts are the same as the conventional one except that 2V and 2W are dispersed in each U, V, and W phase. In addition, FIGS. 3a and 3b show examples in which this filter reactor is dispersed.
A structural diagram of a storage box for the VVVF inverter device is shown, in which FIG. 3a is a side view seen from the direction of movement of the electric vehicle, and FIG. 3b is a plan view seen from the bottom of the electric vehicle. In both figures, 40 is a storage box that integrally houses a VVVF inverter device, a dynamic brake chopper control device, a filter reactor, a common bus bar, and a connection line, and its width is approximately the same as the width of the vehicle body 20. Reference numeral 40a designates the bottom part of the storage box 40, and the bottom part 40a can have a shield structure over its entire surface. Also, 40
b and 40c indicate the side surface and top surface of the storage box 40, respectively.

As shown in FIG. 3b, inside the storage box 40 are a U-phase split filter reactor 2U, a filter capacitor 4U, and a thyristor 5U, and a V-phase split filter reactor 2V, a filter capacitor 4V, and a thyristor. 5V is integrated into one side, W-phase split filter reactor 2W, filter capacitor 4W and thyristor 5W, chopper control device 7 for dynamic brake, gate control section of VVVF inverter device and gate control section of chopper control device 7 for dynamic brake. A common gate control unit 10 is arranged on the other side. Further, as can be seen from FIGS. 3a and 3b, the common bus 50 is wired at the upper center of this storage box 40, and is connected to the VVVF
Split filter reactor 2U, 2V, 2W, filter capacitor 4U, 4V, 4W, thyristor 5U, 5V, 5W, which is the main circuit part of the inverter device
The dynamic brake chopper control device 7 is connected to a predetermined busbar of the common busbar 50 by a short connection line 51. Note that the individual divided filter reactors 2U, 2V, and 2W divided into three equal parts are interconnected by a common bus 50 and function as one reactor.

[Effects of the invention] As described above, according to this invention, the various control devices arranged under the floor of the electric car body, the common bus bar, and the connection wires that respectively connect the various control devices and the common bus bar can be integrated into one The storage box has a width that maximizes the width of the electric car and the car body, and its bottom has a shield structure over the entire surface, so each signal distributed on the ground can be stored in a storage box. It is possible to easily reduce inductive disturbances to equipment, etc., and the wiring between storage boxes can be made as short as possible, so that control devices with high operating frequencies such as VVVF inverters can be operated reliably. Further, by arranging the common bus bar at the upper center of the storage box, the distance from each signal equipment on the ground is increased, so that the effects of induction disturbances can be further reduced.

[Brief explanation of the drawing]

Figures 1a and 1b are views showing an underfloor storage box for a control device according to a first embodiment of this invention;
Figure a is a side view of the electric car as seen from the direction of movement, Figure 1b
The figure is a plan view seen from below, Figure 2 is a main circuit connection diagram of the VVVF inverter device which is the control device in the second embodiment of this invention, Figures 3a and 3.
Figure b is a diagram showing an underfloor storage box for a control device according to a second embodiment of the invention, Figure 3a is a side view seen from the moving direction of the electric car, Figure 3b is a plan view seen from below, and Figure Figure 4 is a main circuit connection diagram of a conventional VVVF inverter device, Figures 5a and 5b are diagrams showing the underfloor storage box for the control device in a conventional electric car, and Figure 5a is a view from the direction of movement of the electric car. The side view, FIG. 5b, is a plan view seen from below. In the figure, 20 is the vehicle body, 21 is the underfloor surface, and 3
8 and 40 are storage boxes, 38a and 40a are bottom parts, 3
8b and 40b are side parts, 38c and 40c are upper surface parts, 50 is a common bus bar, and 51 is a connection line. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Scope of claim for utility model registration] Various control devices for electric vehicles installed under the floor of the body of the electric vehicle on both sides in the direction of movement of the electric vehicle;
Similarly, storage boxes 38 and 40 are provided in the center of the underfloor for storing a common bus bar extending along the moving direction of the electric car and interconnecting the various control devices, and connection lines connecting the common bus bar and the various control devices. In addition, side parts 38b, 40b, top part 38c, 40c
and bottom portions 38a, 40a, the side portions 38b, 40b extend over approximately the same width as the vehicle body so as to integrally cover the various control devices, the common bus bar, and the connection line from the surrounding side surface; The upper surface portions 38c, 40c extend between the underfloor surface of the vehicle body and the various control devices, the common bus bar, and the connection line so as to cover these from above over a width that is approximately the same as the width of the vehicle body, and the bottom surface portion 38a , 40a extends over a width approximately equal to the width of the vehicle body so as to cover the various control devices, the common bus bar, and the connection wires from below, and has a shield structure covering the entire surface to block electrical noise generated from these. The side portions 38b, 40b and the top portions 38c, 4
An underfloor storage box for a control device in an electric vehicle, which integrally stores the various control devices, a common bus bar, and a connection line using the bottom surface portions 38a and 40a.