JPH01212640A - Electric power source system for vehicle - Google Patents

Abstract

PURPOSE:To obtain the small-sized and lightweight constitution of the whole input circuit part at a low cost by arranging the input circuit part only on one train and connecting each electric power source device of each train connected each other, with the input circuit part through a straight pull line. CONSTITUTION:A DC stringing electric power source supplies electricity into the input circuit part 5 of the first train 2 as special train through a pantagrah 1. The electricity supplied into the input circuit part 5 is supplied into an electric power source device 6 through a filter circuit consisting of a switch 7, high speed breaker 8, reactor 9, and a condenser 12. At this time, the electricity supplied into the input circuit part 5 is also supplied into the electric power source device 6 of the second train 3 through a straight pull line 14. Further, in each electric power source device 6, the DC electric power is converted to the AC electric power independently each other by using a semiconductor device, and an AC load is driven by the AC electric power.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicle power supply system that supplies power to an AC load of each connected vehicle.

[Conventional technology]

FIG. 2 is a circuit diagram showing a conventional vehicle power supply system. In the figure, 1 is a pantograph, 2 is a first vehicle, and 3
4 is the second vehicle connected to the first vehicle 2, and 4 is each vehicle 2.
．． 3 is a wheel, 5 is an input circuit unit, and 6 is a power supply device ◇In addition, in the input circuit unit 5, 7 is a switch, 8 is a high-speed circuit breaker, 9 is a reactor, and 10 is a contactor (or a component with an equivalent function). ), 11 is a current limiting resistor, 12 is a capacitor, and 13 is a short-circuit thyristor. 14 is a through line to the second vehicle 3 which does not have the pantograph 1.

Next, the operation will be explained. DC overhead wire power is supplied to the first vehicle 2 through the pantograph 1.

The supplied DC power is first supplied to the power supply device 6 through a filter circuit including a switch 7, a high-speed circuit breaker 8, a reactor 9, and a capacitor 12 in the first vehicle 2. This power supply device 6 having an AC load generally uses a semiconductor device, and drives the AC load with power obtained by converting DC power into AC. In FIG. 2, the load circuit is omitted. Conversion from DC to AC can be done by directly converting the output of a filter circuit into AC using an inverter circuit, or by converting the output of a filter circuit directly to AC using an inverter circuit, or by converting the output to AC power through an inverter circuit after converting it to constant voltage power through a filter circuit. There is also. In either case, harmonics as switching noise are generated in the power supply device 6 because the switching function of the semiconductor device is used to convert h1 direct current to alternating current. If this harmonic flows out to the rail as a return current, there is a risk of causing trouble to traffic lights, etc. In order to prevent such harmonics from flowing out, the above-mentioned filter circuit is indispensable.

In addition, in order to prevent LC resonance and suppress inrush current of the filter circuit consisting of the reactor 9 and capacitor 12,
A contactor 10 and a current limiting resistor 11 are inserted between the reactor 9 and the capacitor 12, and when the power is turned on, power is applied to the capacitor 12 through the current limiting resistor 11. Then, after the capacitor 12 reaches a certain voltage,
Contactor 10 is closed and power is supplied to power supply 6 through contactor 10. Note that any switching element can be used as the contactor 10 as long as it has an equivalent function; for example, a thyristor can be used instead of the contactor 10.

In addition, to protect the input circuit section 5 from overvoltage, a short-circuit thyristor is generally used, and when the capacitor 12 becomes overvoltage, the short-circuit thyristor 13 is made conductive to generate an overcurrent, which activates the high-speed circuit breaker 8. to shut off the input power and protect the circuit from overvoltage.

Therefore, the input circuit section 5 is an essential circuit in the above-described vehicle power supply system having an AC load. Similarly, pantograph 1. In the second vehicle 3 that does not have a power supply, the power supplied through the lead-in line 14 is supplied to the power supply device 6 through the input circuit section 5 of the second vehicle 3, and the same as in the case of the vehicle 2 of M1 described above. to safely supply AC power to the load circuit.

[Problem to be solved by the invention]

Since the conventional vehicle power supply system is configured as described above, the first vehicle 2. It is necessary to provide an input circuit section 5 for each power supply device 6 of the second vehicle 3, which is a problem in that the power supply system goes against the desire for compactness and weight reduction required for vehicles, and also becomes expensive. There was. On the other hand, if the power supply system 6 is centralized and mounted on a specific vehicle with emphasis on downsizing and weight reduction of the power supply system, the AC power supply may be passed between each vehicle 2 and 3 to supply the AC load. Therefore, there was a problem that it became impossible to control AC loads such as coolers for each vehicle.

This invention was made to solve the above-mentioned problems, and it is possible to make the power supply system of a vehicle smaller, lighter, and cheaper, and to provide a vehicle power supply that can independently drive AC loads for each vehicle. The purpose is to obtain a system.

[Rounding method to solve the problem]

In the vehicle power supply system according to the present invention, an input circuit unit having a cutoff circuit and a filter circuit for input to each power supply device in a plurality of connected vehicles is installed in a specific vehicle among the vehicles, and the input circuit unit is installed in a specific vehicle among the vehicles. The power supply devices of each vehicle are individually connected to the section via lead-through lines.

[Effect]

The power supply device in this invention is provided for each connected vehicle, but since these receive DC power through the input circuit section provided in a specific vehicle, they receive regular power that is overvoltage protected or current limited. In response, we have made it possible to stably operate AC loads for each vehicle, and installed the input circuit section only in specific vehicles, making the overall configuration more compact.

It is possible to reduce the weight and further reduce the chance of receiving adverse effects such as interference with signals from ground equipment.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 1 is a pantograph, 2 is a first vehicle as a specific vehicle, 3 is a second vehicle, 4 is a wheel, and 5 is a centralized input circuit section, which is a first vehicle as a specific vehicle. It is provided only in vehicle 2.

6 is a power supply device. Further, in the input circuit section 5, 7
8 is a high-speed circuit breaker; switch 7 and high-speed circuit breaker 8 are configured as an input circuit breaker. 9 is a reactor, 10 is a contactor or a component having an equivalent function, 11 is a current limiting resistor, 12 is a capacitor, and 13 is a short-circuit thyristor. Further, 14 is a lead-through line to the second vehicle 3. Note that the reactor 9 and the capacitor 12 constitute a filter circuit.

Next, the operation will be explained. DC overhead wire power is supplied to the input circuit section 5 of the first vehicle 20 through the pantograph 1. The output of the input circuit section 5 is supplied to the power supply device 6 of the first vehicle 2, and is also supplied to the power supply device 6 of the second vehicle 3 through the lead-in line 14. The power supply device 6 of each vehicle 2.3 uses a semiconductor device to independently convert DC power into AC power, and independently drives each AC load with this AC power. Note that the necessity and operation of the input circuit section 5 are exactly the same as in the conventional case described above, so a description thereof will be omitted.

The input circuit section 5 centralized in the first vehicle 2 supplies power to a plurality of power supply devices, compared to a conventional vehicle power supply system in which each vehicle 2.3 is provided with an input circuit section. Since this is necessary, the structure of the input circuit section for one car is somewhat larger, but the overall size and weight can be sufficiently reduced. This is because the components and structure constituting the input circuit section 5 are affected by load capacity and other factors, such as interference with ground equipment such as traffic lights, short-circuit current and overhead line voltage when the overvoltage protection circuit is activated. This is because there are many. .

〔Effect of the invention〕

As described above, according to the present invention, an input circuit section having a cutoff circuit and a filter circuit for input to each power supply device for each vehicle is provided only in a specific vehicle, and the power supply for each vehicle is connected through this input circuit section. Since the device is configured to supply DC power, the overall configuration of the input circuit can be made smaller, lighter, and less expensive, and the input circuit is less susceptible to external disturbances. This has the effect of being able to control the alternating current load for each vehicle.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a vehicle power supply system according to an embodiment of the present invention, and FIG. 2 is a circuit diagram showing a conventional vehicle power supply system. 2 is a specific vehicle (first vehicle), 3 is a second vehicle, 5 is an input circuit section, and 6 is a power supply device. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] In a vehicle power supply system in which each of a plurality of connected vehicles is provided with an AC load and a power supply device that independently supplies power to the AC load, the vehicle power supply system has a cutoff circuit and a filter circuit for input to each of the power supply devices. A vehicle characterized in that an input circuit unit is installed in a specific vehicle among the vehicles, and the input circuit unit is connected to the power supply device of each vehicle including the specific vehicle through a lead-through line. power system.