JPH0793761B2 - Electric vehicle guidance obstacle prevention device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a dielectric fault prevention device for an electric vehicle that collects and controls electric power from the outside, and particularly relates to vehicle body grounding.

[Conventional technology]

Figure 2 shows, for example, "The 22nd Domestic Symposium on Cybernetics on Railroads, 421" held in November 1985.
It is a block diagram of the conventional inverter control device shown in,
In the figure, (1) is a collector such as a pantograph that collects DC power from an electric wire such as an overhead wire, (2) is a switch for turning on and off the main circuit, and (3a) is the same as the collector (1). A three-phase inverter configured by a GTO thyristor installed in the first vehicle to control the conversion of direct current into an alternating current, (4a) is a three-phase induction motor installed in the first vehicle, and (3b) is the first vehicle. Differently, a three-phase inverter having the same structure as the three-phase inverter (3a) installed in the second vehicle where the current collector (1) is not installed, (4b) is a three-phase induction motor installed in the second vehicle, (5) is a ground switch, (6) is a return circuit to the rail of the vehicle constituted by an earth brush, wheels, etc.,
(7a) and (7b) are crossovers between positive and negative vehicles that supply power to the three-phase inverter (3b), and (8a) and (8b) are conductivity of the three-phase inverters (3a) and (3b), respectively. Box grounding between the equipment box and the vehicle body, and (9) grounding of the vehicle body to the first vehicle having the same potential as the return circuit (6).

Next, the operation will be described. A DC voltage is collected by a collector (1), a DC voltage is applied to the three-phase inverters (3a), (3b) by turning on a switch (2), and a three-phase AC voltage is generated by the inverter operation. This makes 3
The speed of the vehicle can be adjusted by controlling the drive of the phase induction motors (4a) (4b).

The three-phase AC voltage generated by the inverter operation is a three-phase variable voltage in which the DC voltage is converted by the switching operation of the power semiconductors, such as GTO, thyristor, and transistor, which constitute the three-phase inverters (3a) and (3b). Voltage variable frequency AC voltage. The detailed operation of this controller system is described in detail in the literature and is not directly related to the present invention, and therefore omitted.

When this device is installed on the car body, the grounding to the car body is performed by box grounding (8a) and (8b) in order to equalize the electric potential with the car body and to absorb the induced noise current and the radiated noise to ground. , Positive or negative side of the car body and power supply circuit,
That is, a vehicle body ground (9) is provided to connect the current collector (1) side and the opposite pole.

[Problems to be solved by the invention]

Since the conventional electric vehicle induction failure prevention device is configured as described above, the main circuit and the three-phase inverters (3a), (3b), and dv / dt generated when switching the control element of the power semiconductor are used. A spike current that passes through the stray capacitance existing between the induction motors (4a), (4b), etc. is generated.

The path through which the spike current flows will be described with reference to FIG. In the figure, (10) is a power semiconductor control element such as a GTO thyristor, and (11) is a stray capacitance existing between the main circuit wiring component and the equipment box of the three-phase inverter (3). As indicated by the arrow in the figure, the spike current is generated when dv / dt generated by switching of the control element (10) passes through the stray capacitance (11), and the control element (10), stray capacitance (11), and three-phase Vehicle grounding (9), grounding switch (5) through the box grounding between the equipment box of the inverter (3) and the vehicle body or the mounting portion to the vehicle body
Flows back to the control element (10).

When the spike current generated by such abrupt dv / dt flows across the vehicles, it flows through the crossovers (7b) that electrically connect the vehicles, so as shown in FIG. There has been a problem that a signal device or the like having the loop (12) installed in the device causes an inductive failure to malfunction the signal device.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an inductive obstacle prevention device for an electric vehicle that can prevent malfunction of signal equipment.

[Means for solving problems]

The inductive fault prevention device for an electric vehicle according to the present invention grounds the device boxes of the control devices dispersedly arranged between the connected vehicles to the vehicle body, and connects the positive or negative side of the power supply circuit, that is, the current collector (1 ) Side is the one with the input potential of the opposite pole grounded to each car body.

[Action]

The spike current generated by dv / dt generated in the control device according to the present invention is returned to the control device by the grounding of the vehicle body of each vehicle and the control device to prevent the influence on the outside.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. First
In the figure, the devices having the same reference numerals as those in FIG.
(5b) is the grounding switch installed in the second vehicle without the current collector (1) installed, (6b) is the return circuit of the second vehicle, (9b) is the return circuit (6b) The vehicle body is grounded to the second vehicle of the same potential.

The spike current generated based on the switching control of the internal control element of the three-phase inverter (3b) of the second vehicle is 3
Return from the conductive equipment box of the three-phase inverter (3b) to the inside of the three-phase inverter (3b) by backflowing the body ground (9b) and the ground switch (5b) through the box ground (8b) or the mounting part to the vehicle body. To do. This route is shown by the one-dot chain line arrow in FIG. 1, but since the route does not include a connecting line between vehicles, it is possible to prevent a spike current based on switching control from passing between vehicles.

Although the control device has been described as a three-phase inverter in the above embodiment, this may be any device that is configured by a power control element that generates a spike current based on switching control. An uninterruptible power supply that supplies power can be considered in the same way.

〔The invention's effect〕

As described above, according to the present invention, the path of the spike current based on the switching control of each control device (3a, 3b) is formed for each vehicle, so that the path does not include a crossover between the vehicles. Therefore, it is possible to prevent the spike current from passing between the vehicles, and it is possible to prevent the signal device or the like installed between the rails from inducing an obstacle and causing the signal device to malfunction.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a grounding system according to an embodiment of the present invention, FIG. 2 is an explanatory view showing a conventional grounding system, FIG. 3 is an explanatory view showing a spike current path, and FIG. It is an explanatory view showing a crossing route. In the figure, (1) is a current collector, (3a) and (3b) are three-phase inverters, (4a) and (4b) are drive motors, (7a) is a crossover wire, (8a) and (8b) are box grounds,
(9) (9a) is the ground contact with the vehicle body. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. An inductive fault prevention device for an electric vehicle, comprising: a first control device (3a) and a second control device (3b), wherein the electric vehicle is a current collector (1) and this current collector. A first vehicle equipped with a first control device (3a) supplied with DC power from (1) and power from the current collector (1) of the first vehicle via a crossover (7a). Second control device supplied (3b)
Control device (3a) by connecting to a second vehicle equipped with
The drive motors (4a) and (4b) are controlled by (3b), and the first control device (3a) stores a rectifying element for controlling electric power switching in the first equipment box, The equipment box is grounded to the vehicle body (8a), and the opposite pole from the collector side is grounded to the vehicle body (9). The second control device (3b) is connected to the second equipment box. A rectifying element for switching control of electric power is housed, the second equipment box is grounded (8b) to the vehicle body, and the opposite pole from the collector side is grounded to the vehicle body (9b). An inductive fault prevention device for an electric vehicle, wherein a path of a spike current based on switching control of a control device (3a, 3b) is formed for each of the first vehicle and the second vehicle.