JPH0568301A - Auxiliary power supply for vehicle - Google Patents

Abstract

PURPOSE:To sustain operation through remaining normal CVCF inverters by disconnecting failed CVCF inverters from a system by means of a switch, short- circuiting an input side filter capacitor, and then releasing a load by means of an output side switch. CONSTITUTION:DC voltage taken in through a pantograph 1 and a DC reactor 2 is divided through a plurality of filter capacitors(FC) 3-5 connected, respectively, with CVCF inverters 9-11. The inverters 9-11 are operated synchronously and the outputs therefrom are shaped through AC filters 12-14 and combined through a three-phase transformer 18 to produce an AC output for operating various auxiliary machines in a vehicle. Upon failure of the CVCF 9, for example, it is disconnected by means of a switch 6 and a CF 3 is short-circuited to open switches 15, 19. Remaining CVCFs 10, 11 then perform DC/AC conversion and power is fed from the transformer 18 to low power loads, e.g. a controller and a fluorescent light 21 thus sustaining the operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle auxiliary power supply device.

[0002]

2. Description of the Related Art As an auxiliary power supply device for a vehicle, a static conversion device has been generally used in the past, and most of them have a DC / DC that always obtains a constant DC voltage with respect to a change in overhead line voltage.
It is composed of a DC converter and an inverter that supplies electric power to a vehicle controller, an electric light, a compressor, an air conditioner, etc. based on the output of the DC / DC converter.

Further, in recent years, as a medium-capacity power supply device compatible with decentralization of vehicle auxiliary power supply, an overhead wire voltage is divided by filter capacitors connected in series, and a CVCF inverter for synchronous operation is connected to each filter capacitor. A capacitor voltage dividing type multi-stage connected inverter having a configuration in which the outputs of the respective CVCF inverters are combined by a three-phase transformer and then electric power is supplied to a load has also been put into practical use.

[0004]

However, in any of these types of vehicle auxiliary power supply units, maintenance is easy, but since semiconductor elements are controlled by complicated electronic circuits, noise is generated during business operation. It may stop suddenly. In that case, since the control device required to drive the vehicle depends on the output of the CVCF inverter for its control power source, it becomes difficult to drive the vehicle, and the interior lights also go out, which leads to a safety problem. There was a possibility that the above problem would occur.

Further, in the case of the capacitor voltage dividing type multi-stage connection inverter system, even if only one system out of a plurality of CVCF inverters operating in synchronization fails, another healthy CVC will operate.
There was a problem that the F inverter could not be operated and wasted. Therefore, in order to prevent such a problem, another auxiliary power supply that is in operation employs a method of performing extended power supply.However, since the capacity of each device is designed in consideration of the extended power supply, the capacity is normally reduced. There was a problem that it was excessive and wasted on equipment.

The present invention has been made in view of the above-mentioned conventional problems, and even if a failure occurs in one of the CVCF inverters which are synchronously operated without performing the extended power feeding, this failure occurs. It is an object of the present invention to provide an auxiliary power supply device for a vehicle, which is capable of disconnecting the established system, continuing the synchronous operation of other healthy CVCF inverters, and supplying electric power to a minimum required load.

[0007]

According to the present invention, an overhead wire voltage is divided by a plurality of filter capacitors connected in series to a DC power source input, CVCF inverters are connected to the respective filter capacitors, and these CVCF inverters are connected. After synchronous operation, the output was wave-shaped by an AC filter and then combined by a three-phase transformer to obtain an AC output, and the lighting device and vehicle controller were connected to the output of this three-phase transformer together with the air conditioner. In the vehicle auxiliary power supply,

At the input of each of the CVCF inverters,
Normally, each filter capacitor is connected to the CVCF inverter, and both ends of each filter capacitor are short-circuited by switching, and a changeover switch that can disconnect the CVCF inverter from the system is provided, and the output unit of each CVCF inverter and the input unit of the air conditioner are provided. Each of them has a disconnecting switch that is normally closed and opens when an abnormality occurs.

When one system out of a plurality of CVCF inverters operating synchronously fails, the failed CVCF inverter is disconnected from the system by the changeover switch, its filter capacitor is short-circuited, and the failed C
The disconnection switch connected to the filter capacitor on the output side of the VCF inverter and the disconnection switch connected to the air conditioner are opened.

[0010]

In the vehicle auxiliary power supply device of the present invention, the voltage is divided by the plurality of filter capacitors connected in series to the DC power supply, and the CV connected to each filter capacitor.
DC voltage is input to the CF inverter, and each C
The VCF inverter converts DC / AC and outputs AC power. Then, this AC power is combined into a three-phase transformer,
It is supplied to vehicle control devices, vehicle interior lights, air conditioners, and the like.

When a failure occurs in one of the CVCF inverters, the failed CVCF inverter is disconnected from the system by a changeover switch, its filter capacitor is short-circuited, and a filter capacitor on the output side of the failed CVCF inverter is used. Open the disconnecting switch connected and the disconnecting switch connected to the air conditioner, perform DC / AC conversion with the remaining normal CVCF inverter, combine with a three-phase transformer, and consume relatively little power. The power supply to the vehicle control device and the interior light of the vehicle will be continued.

Thus, even if one of the plurality of CVCF inverters fails, the failed CVCF inverter is disconnected and the other healthy CVCF inverters continue to operate in synchronization, which is the minimum required for operation. Power can be supplied to the load.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 shows a circuit configuration of an embodiment of the present invention, showing an embodiment of a vehicle auxiliary power supply device for dividing an overhead line voltage into three. In FIG. 1, a DC reactor 2 is connected to a pantograph 1 that collects current from a DC overhead wire. The DC reactor 2 is connected to the positive electrode side of the filter capacitor 3 among the filter capacitors 3 to 5 connected in series.

The terminal voltages of the filter capacitors 3 to 5 are supplied to three CVCs via the changeover switches 6 to 8, respectively.
The changeover switches 6 to 8 are connected to the F inverters 9 to 11, respectively, and the changeover switches 6 to 8 normally output the terminal voltages of the filter capacitors 3 to 5 to the CVCF inverters 9 to 9.
When a failure occurs, both ends of the filter capacitors 3 to 5 are short-circuited by a switching operation.

The AC filter circuits 12 to 14 are connected to the outputs of the CVCF inverters 9 to 11, respectively, and the outputs of the AC filter circuits 12 to 14 are cut off by three-phase transformers via disconnection switches 15 to 17, respectively. Bowl 18
It is connected to the.

The output of the three-phase transformer 18 is connected to a vehicle controller 20, a fluorescent lamp 21 as an interior lamp, and an air conditioner 22 via a disconnect switch 19. Next, the operation of the vehicle auxiliary power supply device having the above configuration will be described.

When the CVCF inverters 9 to 11 are all sound, the changeover switches 6 to 8 are all set to CVCF.
It is connected to the inverters 9 to 11 side, and the disconnection switches 15 to 17 and 19 are all closed.

In this state, the DC power taken in from the pantograph 1 passes through the DC filter reactor 2, and the overhead voltage is divided into 3 by the action of the filter capacitors 3 to 5, and the CVCF inverters 9 to 11 are switched. 6-8.

In each of the CVCF inverters 9 to 11, the DC input is converted into AC power of commercial frequency containing harmonic components, and the AC output of commercial frequency containing these harmonic components is supplied to the AC filter circuits 15 to 17. As a result, the harmonic components are attenuated, the commercial frequency alternating current after this is input to the three-phase transformer 18, and the AC power of the commercial frequency is output by being combined there, and this is used for vehicle control. It is supplied to the device 20, the fluorescent lamp 21, and the air conditioner 22.

Now, 1 of CVCF inverters 9-11
On the other hand, when the CVCF inverter 9 fails, the changeover switch 6 is changed over to the side where the filter capacitor 3 is short-circuited, and the disconnection switches 15 and 19 are opened. As a result, the CVCF inverter 9 is disconnected, the air conditioner 22 is also disconnected, and the remaining healthy CVC is removed.
The F inverters 10 and 11 continue the synchronous operation.

At this time, from the three-phase transformer 18, the output reduced to 2/3 before the failure is supplied to the vehicle control device 20 and the fluorescent lamp 21 which are loads, but the operation is still performed. Therefore, it is possible to continue the operation, prevent the vehicle control device 20 that is indispensable to the operation of the vehicle from being stopped, and at the same time, prevent turning off the interior light that may cause a security problem.

Here, the CVCF inverters 9-11 are used.
If, for example, the CVCF inverter 9 fails, the CVCF inverter 10, so that the primary voltage of the three-phase transformer 18 is the same as when operating at a voltage divided by three.
The phase of 11 is controlled.

In this way, even if one of the plurality of CVCF inverters fails, only the failed inverter is disconnected and the sound CVCF inverter continues to operate. Power supply to loads that are indispensable for operating trains such as the control device 20 and the fluorescent lamps 21 and for safety can be continued, and only air conditioners that are not so important for operation can be disconnected from the load and slightly The train can continue to operate even if there is a decline in service.

[0025]

As described above, according to the present invention, even if one CVCF inverter fails, this failed CVC inverter
Only the F inverter is disconnected, and at the same time, a device that is not essential for vehicle operation is disconnected by a high-load device such as an air conditioner, the remaining healthy CVCF inverters continue to operate synchronously, and are combined by a three-phase transformer to operate. Since the power is continuously supplied to the minimum required load, the capacity of the inverter does not have to be the capacity that takes into consideration the extended power supply even when there is a failure, as in the past. There is no need to waste, and even if the CVCF inverter fails, it is possible to continue operating the vehicle by continuing to supply electric power to the vehicle control device and interior lights, and to operate without fear of causing security problems. The operation can be continued.

[Brief description of drawings]

FIG. 1 is a circuit block diagram of an embodiment of the present invention.

[Explanation of symbols]

 1 Pantograph 2 DC reactor 3-5 Filter capacitor 6-8 Changeover switch 9-11 CVCF inverter 12-14 AC filter circuit 15-17 Disconnection switch 18 Three-phase transformer 19 Disconnection switch 20 Vehicle control device 21 Fluorescent lamp 22 Air conditioner

Claims (1)

[Claims] 1. An overhead wire voltage is divided by a plurality of filter capacitors connected in series to a DC power input, CVCF inverters are connected to the respective filter capacitors, and these CVCF inverters are operated synchronously to output the AC voltage. In a vehicle auxiliary power supply device in which a waveform is shaped by a filter and then combined by a three-phase transformer to obtain an AC output, and the lighting device and the vehicle control device are connected to the output of the three-phase transformer together with the air conditioner, Usually, each filter capacitor is connected to the CVCF inverter at the input part of each CVCF inverter, and a changeover switch capable of short-circuiting both ends of each filter capacitor by switching and disconnecting the CVCF inverter from the grid is provided. Section and the input section of the air conditioner If a disconnection switch that is normally closed and that opens when there is an abnormality is provided, and one of the CVCF inverters operating in synchronization fails, the failed CVCF inverter is disconnected from the system by the changeover switch and its filter is used. A vehicle auxiliary power supply device configured to short-circuit a capacitor and open a disconnect switch connected to a filter capacitor on the output side of a defective CVCF inverter and a disconnect switch connected to an air conditioner.