JPH0471303A - Controller for electric vehicle - Google Patents

Abstract

PURPOSE:To reduce the weight and to simplify the structure by employing a unit constituted of a main circuit arm comprising two semiconductor elements connected in series for formation of a converter and an inverter, containing each unit in a container having same shape and then connecting the unit. CONSTITUTION:Two semiconductor elements 5, 5 are connected in series to constitute a main circuit arm 6 and a single unit 17 is constituted of main circuit arms 6 for two phases. AC voltage collected 2 from an overhead line 3 is transformed through two transformers 1 thence fed to the units 17 in a converter 4, and then DC outputs from the units 17 are connected in parallel and fed to an inverter 7. The inverter 7 comprises a single unit 17 identical to that in the converter 4 and a unit 19 including the main circuit arm 6 and an overcurrent protective circuit 9, and the inverter 7 produces three-phase VVVF power U-W for driving an induction motor 8. The units 17, 19 are contained in identical containers 18. According to the constitution, wiring is simplified, component can be employed commonly resulting in reduction of the size and the weight.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention receives power from an AC feeder line, converts it to DC using a converter, converts it to 3-phase AC using an inverter, and supplies power to an induction motor, etc. This invention relates to an electric vehicle control device that performs control.

[Conventional technology]

Fig. 3 shows the circuit configuration of this type of conventional electric vehicle control device. The main transformer (4) is a converter connected to the secondary winding of the main transformer (1), which converts single-phase AC from the main transformer (1) into DC. The main circuit arm (6) is made up of two arms connected in series with each other, each consisting of a semiconductor element (5) such as a GT○ thyristor, for four phases, and as shown in the figure, the main transformer (1
), a single-phase bridge is formed for each secondary winding, and the output sides thereof are connected in parallel.

In this way, the reason for the parallel configuration of two bridges is to improve the smoothness of the DC voltage supplied to the inverter (7) by shifting the phase of the gate signal to the semiconductor element (5) of both bridges. The main purpose is to

(71 is an inverter connected to the output side of the converter (4), which converts the DC output from the converter (4) into three-phase AC and supplies power to the induction motor (8). , U, V, and W. The main circuit arm (6) is composed of three phases. (9) is a protection circuit consisting of a Zyristor and a reverse conduction diode that conduct during overvoltage.

Figures 4 and 5 are concrete structural diagrams of the converter (4) and inverter (to), respectively.As shown in the figures, the main circuit arm (6) and protection circuit (9) of both are single units. (13) is housed in a container (10) and cooled by cooling air from an electric blower (12) arranged through a duct (11). (13) is the exhaust side of each main circuit arm (6). These are peripheral parts installed in the casing, such as resistors, that generate a relatively large amount of heat.The above-mentioned devices are housed in an outer box (14), and an air filter (15) is installed on the air inlet side. Further, (16) is a peripheral component housed in a separate chamber formed on the side surface of the outer box (14), and is composed of components with a relatively small calorific value.

Note that the arrows in the figure indicate the flow of cooling air.

[Problem to be solved by the invention]

As mentioned above, the conventional electric vehicle control device has a main circuit arm (
6) Since each phase is housed in a container (10), the wiring between the containers (10) is complicated and there is a large amount of wiring, and the shape of the duct (11>) is also complicated, which increases the overall size of the device. There was a problem in that both weights increased.

This invention was made to solve the above-mentioned problems, and aims to simplify the wiring and equipment configuration, and to obtain a small and lightweight electric vehicle control device.

[Means and effects for solving the problem] The electric vehicle control device according to the present invention accommodates each of the two phases of the main circuit arm of the converter in a common container as a unit with interconnections between them. The converter is composed of a main circuit unit consisting of a main circuit unit 1 and a main circuit unit 1 containing two phases of the main circuit arm of an inverter housed in a common container as a unit with wiring between them. The main circuit unit can be shared with the inverter and the inverter.

In this case, the number of terminals drawn out from the container to the DC side is reduced, and the distribution line is simplified. Furthermore, the number of containers is reduced to nearly half, and the containers can be used both for converters and inverters, so the overall structure of the device is simple, lightweight, and compact.

〔Example〕

FIG. 1 is a layout diagram showing an electric vehicle control device according to an embodiment of the present invention, and FIG. 2 is a circuit configuration diagram thereof. Here, the main circuit arms (6) for two phases are housed in a common container (18) as one main circuit unit (17). Specifically, the main circuit arms (6) of the first and second phases of the converter (4), the main circuit arms (6) of the third and fourth phases of the converter (4), and the main circuit arms (6) of the inverter (7). U
The main circuit arms (6) of the phase and ■phase are combined to form No. and I units, respectively, and have the same configuration. Here, even if the main circuit unit (17) of the converter (4) and the inverter (71) has the same configuration, there will be no major difference in rating selection for the following reason. As shown, the converter (4) has a parallel configuration of two single-phase bridges mainly to improve the waveform of the DC output voltage.As a result, the capacity of one arm of the converter (4) is reduced, and the converter (4) and inverter ( This is because the ratings of the capacitance, etc. of the semiconductor element ((5)) are relatively close to that of the sword.

In addition, the W-phase main circuit arm (6) of the inverter (7) is combined with its protection circuit (9), and the N (1, 2 units 1-
(19) is housed in a container (20) having the same shape as the container (18) of the No. 1 unit.

The main circuit arm (
Among the terminals such as 6), those connected to the same polarity on the DC side are wired inside the container, reducing the number of lead-out terminals to the outside of the container by half.

A total of four units (+7) (19) are housed in a common outer box (21) as shown in Figure 1, and are connected to the duct (1).
1) is cooled with a common cooling air by an electric blower (12) disposed through the air blower (12). Note that the unit for the inverter (7) is placed on the leeward side so that the loss generated as a whole is reduced. Also, (22) is for each unit l-(17)(1
9), and specifically includes an anode reactor, a voltage detection element, a capacitor, a resistance element, etc. connected to the semiconductor element (5) and the protection circuit (9).

As described above, since the main circuit arms for two phases are housed in a common container, the parts and space necessary for mounting and insulating each main circuit arm can be saved or omitted, and the The number of wires outside the container, which tend to increase in size and shape due to the above conditions, is significantly reduced, making it possible to downsize the entire device.

Furthermore, since the number of containers is reduced and they are all of the same shape, it is possible to arrange them with a good space factor, reducing the overall space and simplifying assembly.

Furthermore, since the main circuit unit of the converter (4) and the inverter (7) is shared, maintenance and management of spare equipment becomes easier and more economical.

In addition, since the converter (4) and inverter (7) are integrated into a common outer box (21), the amount of wiring is small and installation and removal from the vehicle body is easy.
Since there are fewer external wirings, it is also advantageous in terms of inductive interference.

In the above embodiment, the case where the main circuit arm (6) constituting the converter (4) has four phases has been described, but the present invention is not necessarily limited to a four-phase configuration.

Further, in the above embodiment, the peripheral components are configured integrally with the main circuit unit, but depending on the specific contents of the components, the peripheral components may be arranged individually.

〔Effect of the invention〕

Since the present invention is configured as described above, the number and types of containers that house semiconductor devices are reduced, wiring outside the container is simplified, and the overall device configuration is simple, lightweight, and compact, making maintenance and spare parts easier. The management of the containers is also simple and economical.

[Brief explanation of drawings]

FIG. 1 is a layout and structure diagram of an electric vehicle control device according to an embodiment of the present invention, FIG. 2 is a circuit configuration diagram thereof, FIG. 3 is a circuit configuration diagram showing a conventional electric vehicle control device, and FIG. 4 and the fifth
The figure is a diagram of its layout and structure. In the figure, (41 is a converter, (51 is a semiconductor element, (6) is a main circuit arm, (7) is an inverter, (17 is a
) is the main circuit unit I, and (18) is the container. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] A converter that connects two arms made of semiconductor elements in series to form a main circuit arm for one phase, and converts single-phase alternating current to direct current by using this main circuit arm for even-numbered phases. and an inverter that converts the direct current into three-phase alternating current using three phases of the main circuit arms, and each of the main circuit arms is housed in a container, wherein two of the main circuit arms of the converter The main circuit unit consists of a main circuit unit in which each phase is housed in a common container as a unit with wiring between them, and the two phases of the main circuit arm of the inverter are connected as a unit with wiring between them. An electric vehicle control device comprising a main circuit unit housed in a common container so that the converter and the inverter can share the main circuit unit.