JPH1066201A - Controlling device for power supply for electric car - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the overload of a CVCF inverter auxiliary power supply in order to minimize its capacity. SOLUTION: In this controlling device for a power supply for an electric car, a connection change-over controlling part 23 monitors the opening and closing signals 21 of the doors of electric cars and controls the changing-over action of a connection changing-over switch 13 in response to the opening and closing actions of the doors to drive a VVVF inverter 6, which backs up a CVCF inverter auxiliary power supply. This design requires high power of the auxiliary power supply to increase cooling capability because cool air leaks out of the cars when doors are opened and closed while a train stops at a station with air conditioners turned on especially in summer time. However, it is possible to back up the high power required in the auxiliary power supply by a unit of the VVVF inverter. Therefore, it is unnecessary to increase the capacity of the CVCF inverter auxiliary power supply 12. The separate installation of another auxiliary power supply is not required, either, to make up for the running-short capacity of the auxiliary power supply.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle power supply control device for outputting an auxiliary power supply from a variable voltage variable frequency inverter for a main motor drive power supply of an electric vehicle in place of an auxiliary power supply as required.

[0002]

2. Description of the Related Art In recent years, a control device for controlling a main motor of a railway vehicle has been known as a resistance control for controlling a DC main motor and an individually controlled variable voltage variable frequency (VVVF) for controlling an induction main motor from a chopper device. Inverters are becoming mainstream, and VVVF inverters are becoming smaller capacity VVVF inverters that control one or two main motors instead of large capacity VVVF inverters that control four or eight main motors. on the other hand,
An auxiliary power supply device for supplying a stable low-voltage power supply to various electric devices mounted on a railway vehicle has a constant voltage and constant frequency (C
VCF) is becoming an inverter auxiliary power supply.

[0003] These VVVF inverter devices and CVC
The F-inverter auxiliary power supply has a strong system commonality because its output is a three-phase AC and the capacity is almost the same. Sometimes it operates independently, but when the CVCF inverter auxiliary power supply fails, one VVVF
A system for replacing an inverter device with a CVCF inverter auxiliary power device, that is, a dual mode VVV
An F / CVCF system has been developed and put into practical use.

[0004] The basic configuration of this dual mode VVVF / CVCF system is as shown in FIG. 1. The power taken in from a power overhead line by a pantograph 1 is converted into a predetermined AC power by a variable voltage variable frequency inverter control. Variable voltage variable frequency (VVVF) inverter devices 6 to 9 supplied to the main motors 2 to 5, respectively
And a constant-voltage constant-frequency (CVCF) inverter auxiliary power supply that converts overhead power into constant-voltage / constant-frequency inverter-controlled AC power of a predetermined voltage and a predetermined current and supplies the AC power to a load 11 composed of various electric devices via a transformer 10 12 are provided. On the output side of one VVVF inverter device 6, a changeover switch 13 for switching connection of output power to the main motor 2 and the load 11 is provided,
When the CVCF inverter auxiliary power supply 12 fails, the switching signal is set to receive the failure signal 14 and supply the output power of the VVVF inverter 6 to the load 11 side.

[0005]

However, such a conventional dual mode VVVF / CVCF vehicle power supply control device has the following problems.
In the case of a train having about 8 to 10 cars as a general commuter train, the CVCF inverter auxiliary power capacity required per train is often about 140 kVA to 200 kVA × 2 cars, while the actual CVCF inverter auxiliary power is required. Since the capacity of the device is shared between the VVVF inverter device and the inverter unit, the maximum capacity is 140k due to cooling capacity restrictions.
It is about VA, and the power supply capacity may be insufficient depending on the applied vehicle. Therefore, it is necessary to separately install an auxiliary power supply dedicated to cover the insufficient auxiliary power supply capacity, and the hardware coordination between the main circuit system and the auxiliary power supply system cannot be completely achieved. There was a point.

The present invention has been made in view of such a conventional problem, and covers the insufficient auxiliary power supply capacity while minimizing the capacity of the auxiliary power supply with respect to a fluctuating auxiliary power load. It is an object of the present invention to provide a dual-mode vehicle power supply control device that can be widely applied to various vehicle formations without separately installing a dedicated auxiliary power supply device for the vehicle.

[0007]

According to a first aspect of the present invention, there is provided a vehicle power supply control apparatus for supplying and controlling electric power to a plurality of main motors for driving a vehicle. An auxiliary power supply for outputting auxiliary power to be supplied to various on-board equipment of the vehicle; and the on-board equipment for supplying the auxiliary power from one of the variable voltage variable frequency inverters in parallel with the auxiliary power supply. And switching control means for monitoring a door opening / closing operation of the vehicle and controlling a switching operation of the switching means in response to a door opening / closing operation.

In the vehicle power supply control apparatus according to the first aspect of the present invention, the switching control means monitors the door opening / closing operation of the vehicle, controls the switching operation of the switching means in response to the door opening / closing operation, and controls the variable voltage. Auxiliary power supply is supplied from one of the variable frequency inverters to the vehicle-mounted device in parallel with the auxiliary power supply.

Therefore, particularly when the vehicle stops at the station and opens and closes the doors during the cooling operation in summer, since the cool air leaks out of the room, large power of the auxiliary power supply is required to increase the cooling capacity of the cooler. However, at this time, the large power required for the auxiliary power supply can be backed up by one of the variable voltage variable frequency inverter devices, and there is no need to increase the capacity of the auxiliary power supply device. There is no need to separately install a dedicated auxiliary power supply for covering the power supply capacity, and it is possible to minimize the capacity of the auxiliary power supply with respect to a fluctuating auxiliary power load.

According to a second aspect of the present invention, there is provided a vehicle power supply control device comprising: a plurality of variable voltage variable frequency inverter devices for supplying and controlling electric power to a plurality of main motors for driving a vehicle; An auxiliary power supply that outputs auxiliary power to be supplied to the on-board equipment; and a switching unit that supplies the auxiliary power to the on-board equipment in parallel with the auxiliary power supply from one of the variable voltage variable frequency inverters. Calculating the effective value of the current value detected by the auxiliary power supply current detecting means for detecting the current flowing into the on-board device and the auxiliary power supply current detecting means, and the effective current value exceeds a preset reference value. A switching control means for controlling a switching operation of the switching means.

In the vehicle power supply control device according to the second aspect of the present invention, the switching control means calculates an effective value of the current value detected by the auxiliary power supply current detection means, and calculates the effective value of the current with a predetermined reference value. When the value exceeds the reference value, the switching operation of the switching means is controlled so that one of the variable voltage variable frequency inverter devices supplies auxiliary power to the vehicle-mounted device in parallel with the auxiliary power device. .

Therefore, the large power required for the auxiliary power supply can be backed up by one of the variable voltage variable frequency inverters before the auxiliary power supply generates a high temperature due to an overload, and the auxiliary power supply can be enlarged. There is no need to increase the capacity of the auxiliary power supply, and there is no need to install a separate auxiliary power supply to cover the shortage of auxiliary power capacity. Can be suppressed.

According to a third aspect of the present invention, there is provided a vehicle power supply device comprising: a plurality of variable voltage variable frequency inverter devices for supplying and controlling electric power to a plurality of main motors for driving the vehicle; An auxiliary power supply that outputs auxiliary power to be supplied to the on-board equipment; and a switching unit that supplies the auxiliary power to the on-board equipment in parallel with the auxiliary power supply from one of the variable voltage variable frequency inverters. Auxiliary power supply current detecting means for detecting a current flowing to the on-board device, and switching for controlling a switching operation of the switching means when a current value detected by the auxiliary power supply current detecting means exceeds a preset reference value. Control means.

In the vehicle power control apparatus according to the third aspect of the present invention, the switching control means compares the current value of the current flowing to the on-board equipment detected by the auxiliary power supply current detection means with a predetermined reference value, and Control the switching operation of the switching means when the output voltage exceeds the
Auxiliary power supply is supplied from the table to the vehicle-mounted equipment in parallel with the auxiliary power supply device.

Therefore, when the auxiliary power supply is overloaded, the large power required for the auxiliary power supply can be backed up by one of the variable voltage variable frequency inverters, and the auxiliary power supply needs to have a large capacity. Therefore, there is no need to separately install a dedicated auxiliary power supply for covering the insufficient auxiliary power supply capacity, and it is possible to minimize the capacity of the auxiliary power supply for a fluctuating auxiliary power load.

According to a fourth aspect of the present invention, there is provided a vehicle power supply control device comprising: a plurality of variable voltage variable frequency inverter devices for supplying and controlling electric power to a plurality of main motors for driving a vehicle; An auxiliary power supply that outputs auxiliary power to be supplied to the on-board equipment; and a switching unit that supplies the auxiliary power to the on-board equipment in parallel with the auxiliary power supply from one of the variable voltage variable frequency inverters. Switching control means for controlling the switching operation of the switching means in response to the switching operation of the vehicle for running or powering.

In the vehicle power supply control apparatus according to the fourth aspect of the present invention, the switching control means controls the switching operation of the switching means in response to the switching operation of the running or power running of the vehicle. Auxiliary power supply is supplied from the table to the vehicle-mounted equipment in parallel with the auxiliary power supply device. In this way, instead of operating the auxiliary power supply at full power and supplying the auxiliary power, the variable voltage variable frequency inverter does not need to drive the main motor. By diverting the power to the power supply, the load on the auxiliary power supply device is reduced, the heat generation is suppressed, and it is possible to cope with a temporary overload that may occur later.

According to a fifth aspect of the present invention, there is provided a vehicle power supply control device comprising: a plurality of variable voltage variable frequency inverter devices for supplying and controlling electric power to a plurality of main motors for driving a vehicle; An auxiliary power supply that outputs auxiliary power to be supplied to the on-board equipment; and a switching unit that supplies the auxiliary power to the on-board equipment in parallel with the auxiliary power supply from one of the variable voltage variable frequency inverters. A switching control means for monitoring a load applied to the vehicle, comparing the load with a predetermined reference value, and controlling a switching operation of the switching means according to the magnitude of the reference value.

In the vehicle power control apparatus according to the fifth aspect of the present invention, the switching control means monitors the adaptive load of the vehicle, compares it with a predetermined reference value, and controls the switching operation of the switching means according to the magnitude of the load. Auxiliary power supply is supplied from one of the variable frequency inverters to the vehicle-mounted device in parallel with the auxiliary power supply. This reduces the load on the auxiliary power supply by operating the variable voltage variable frequency inverter as the auxiliary power supply when the load of the vehicle is large, instead of supplying the auxiliary power while operating the auxiliary power supply at full power. In addition, heat generation is suppressed, and it is possible to cope with a temporary overload that may occur later.

According to a sixth aspect of the present invention, in the vehicle power supply control apparatus of the first to fifth aspects, when the one variable voltage variable frequency inverter is operated in parallel with the auxiliary power supply, synchronous operation is performed. Thus, the phase of the auxiliary power can be matched.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a first embodiment of the present invention. The vehicle power supply control device of the first embodiment switches one of the VVVF inverter devices to the CVCF inverter operation by a door opening command when the station stops. Thus, the peak load of the auxiliary power supply is dealt with, and the vehicle is returned to the VVVF inverter device again by the door closing command immediately before departure and used for driving the main motor.

As shown in FIG. 1, a pantograph 1 converts a power taken from an electric power line into a predetermined AC power by VVVF inverter control, and converts the power into a plurality of main motors 2.
A plurality of VVVF inverter devices 6 to 9 that supply power to each of the VVVF inverters 5 to 5 are installed, and a CVCF inverter auxiliary power supply device 12 is installed for a vehicle load 11. Then, one VVVF inverter device 6 is connected to the CVCF
In order to supply power to the vehicle load 11,
A changeover switch 13 is provided.

The changeover switch 13 is switched by a failure signal 14 from the CVCF inverter auxiliary power supply 12 and receives a door opening / closing command 21 and a switching command signal 22
Is set so as to be switched also by a signal from the switching control unit 23 that outputs the.

The switching operation of the changeover switch 13 by the changeover control unit 23 is the setting shown in the timing chart of FIG. In general, the load capacity of the auxiliary power supply often peaks when the train stops at the station, especially in summer, when the vehicle stops at the station and the door opens, the hot air flows into the car, and the cool air flows out of the car. The temperature rises sharply and the cooling load increases. Further, since some types of air conditioning control when the doors are opened include a control for forcibly operating the cooler with the maximum capacity when the vehicle stops at the station, the load capacity of the auxiliary power supply tends to increase further. Also, from the viewpoint of maintainability, air compressors have recently become mainstream, with AC types becoming the mainstream, showing a large percentage of the load on the auxiliary power supply unit. In order to perform this operation, the compressor is often operated when the vehicle stops at the station, and the load capacity of the auxiliary power supply is further increased.

To cope with such a large-capacity auxiliary power load, the switching control unit 23 operates the change-over switch 13 in response to the door opening / closing command 21 to change the VVVF inverter 6 from the VVVF inverter operation to the CVCF inverter operation. To supply power to the vehicle load 11 and back up the CVCF inverter auxiliary power supply device 12 as a backup BK.

In the vehicle power supply control device of the first embodiment, if the CVCF inverter auxiliary power supply device 12 fails and a failure signal 14 is input, the changeover switch 13 is switched, and the VVVF inverter device 6 operates as a CVCF inverter device. To supply the auxiliary power to the vehicle load 11, and when the vehicle stops at the station and opens the door, the switching control unit 23 switches the switching switch 13 to switch the VVVF inverter device 6 to the CVCF inverter. It can be operated as a device, and can back up the load 11 with the power of the VVVF inverter device 6 in parallel with the power of the CVCF inverter auxiliary power device 12.
For this reason, even if the capacity of the CVCF inverter auxiliary power supply 12 alone as the auxiliary power supply is at level A in FIG. 2, the output BK of the VVVF inverter 6 can be backed up to cover the peak load P. When the VVVF inverter device 6 is operated in the CVCF inverter operation and is operated in parallel with the CVCF inverter auxiliary power supply device 12, the VVVF inverter device 6 is operated synchronously in order to make the phases of the output powers coincide.

In the first embodiment, the VVVF inverter device 6 is controlled by increasing or decreasing the capacity of the auxiliary power supply load.
Switching to the CF inverter operation to back up the CVCF inverter auxiliary power supply 12,
It is possible to cope with a large load capacity of the auxiliary power supply without increasing the power capacity of the VCF inverter auxiliary power supply 12 or installing a separate auxiliary power supply.

Next, a second embodiment of the present invention will be described with reference to FIGS. The vehicle power supply control device of the second embodiment monitors the load current of the CVCF inverter auxiliary power supply, calculates the effective current value, and exceeds the reference value corresponding to the upper limit of the thermal assurance of the auxiliary power supply. With VVV
One of the F inverter devices is switched to the CVCF inverter operation to cope with thermal overload, and an auxiliary power load 11 is connected to the secondary side of the transformer 10 on the output side of the CVCF inverter auxiliary power device 12. A current detector 25 for detecting a current flowing through the circuit, a load current effective value calculator 26 for calculating an effective value of the current detected by the current detector 25, and a CVCF
A switching control unit 27 for comparing a value set in advance as a reference value corresponding to the thermal assurance upper limit of the inverter auxiliary power supply device 12 and switching the changeover switch 13 when a current effective value exceeding the reference value is calculated; It is a configuration provided with. The other components are the same as those of the first embodiment, and the common portions are denoted by the same reference numerals, and the detailed description is omitted.

In the vehicle power supply control device according to the second embodiment, as shown in the timing chart of FIG. 4, the load capacity of the auxiliary power supply fluctuates due to the operation of the cooler and the compressor. The current effective value calculation is performed at 26, and this is compared with the reference value at the switching control unit 27. When the thermal continuity rating (set to the reference value) of the CVCF inverter auxiliary power supply 12 is exceeded, the changeover switch 13 is turned on. Operate the VVVF inverter device 6 to C
It is switched to operate as a VCF inverter device, and the CVCF inverter auxiliary power supply device 12 is backed up.

Thus, the rated capacity of the CVCF inverter auxiliary power supply 12 can be suppressed to the steady load level shown in FIG. 4A by the backup BK of the VVVF inverter 6 switched to operate as the CVCF inverter. It is possible to cope with a large load capacity without increasing the power capacity of the CVCF inverter auxiliary power supply 12 or installing a separate auxiliary power supply.

Next, a third embodiment of the present invention will be described with reference to FIGS. The feature of the vehicle power supply control device according to the third embodiment is basically that of the third embodiment shown in FIG.
This embodiment is the same as that of the first embodiment, and responds to the fluctuation of the capacity of the auxiliary power supply load 11 by backing up the VVVF inverter apparatus 6 without increasing the rated capacity of the CVCF inverter auxiliary power supply apparatus 12. ,
The switching of the VVVF inverter device 6 is determined based on the actual current flowing to the auxiliary power supply load, and a short-time overload (generally, 2
The difference is that backup is performed by the VVVF inverter device 6 when the overload of 10% is detected for 10 seconds.

That is, as shown in FIG.
A current detector 25 for detecting the current on the secondary side of the current detector 25; a load current detector 28 for receiving a current detection signal from the current detector 25 to obtain an actual load current; And a changeover control unit 29 that operates the changeover switch 13 when an actual current exceeding the reference value is detected in comparison with the reference value corresponding to the reference value. The other components are the same as those of the first embodiment, and the common portions are denoted by the same reference numerals, and the detailed description is omitted.

In the vehicle power supply control device according to the third embodiment, as shown in the timing chart of FIG. 6, the load current detection unit 28 receives the current detection signal detected by the current detector 25 and This is compared with the reference value corresponding to the short-time overload in the switching control unit 29, and when the actual load current exceeds the reference value corresponding to the short-time overload of the CVCF inverter auxiliary power supply 12, the changeover switch 13 is turned on. By operating, the VVVF inverter device 6 is switched to operate as a CVCF inverter device, and the CVCF inverter auxiliary power supply device 12 is backed up.

As a result, the rated capacity of the CVCF inverter auxiliary power supply 12 can be suppressed to the steady load level shown in FIG. 6A by the backup BK of the VVVF inverter 6 switched to operate as the CVCF inverter. It is possible to cope with a large load capacity without increasing the power capacity of the CVCF inverter auxiliary power supply 12 or installing a separate auxiliary power supply.

In the third embodiment, a reference value setting unit 29a for variably setting a reference value to be set in the switching control unit 29 is provided, and the reference value of the rated current of the CVCF inverter auxiliary power supply 12 is set to 50%. If the value is variably set continuously between% and 100% or in increments of 10%, an optimum reference value can be set according to the actual situation.

Next, a fourth embodiment of the present invention will be described with reference to FIGS. The vehicle power supply control device according to the fourth embodiment includes a CVCF inverter auxiliary power supply device 1.
2 so that the main motor 2 is not always operated at full power.
Is not required to be driven, that is, only one VVVF is provided during a period in which the notch command 30 from the master controller is turned off.
By controlling the inverter device 6 to the CVCF inverter operation and supplying the auxiliary power load 11 to the auxiliary power load 11, so that the CVCF inverter auxiliary power device 12 is rested, the amount of heat generated by the CVCF inverter auxiliary power device 12 is reduced. Even after a temporary overload occurs, the overheating state is prevented. For this purpose, the vehicle power supply control device according to the fourth embodiment includes a switching control unit 31 that monitors a notch command 30 from a master controller and causes the switching switch 13 to perform a switching operation when the notch is turned off. The other components are the same as those of the first embodiment, and the detailed description thereof will be omitted by assigning the same reference numerals to the common parts.

In the vehicle power supply control device according to the fourth embodiment, as shown in the timing chart of FIG.
9 stops and only during the period T when the vehicle is running
The changeover switch 13 is operated by the changeover control unit 31 to operate one VVVF inverter device 6 as a CVCF inverter to perform the backup BK of the CVCF inverter auxiliary power supply device 12. With this control, the total auxiliary power supply capacity is doubled during the notch-off period T, and as described above, the amount of heat generated by the CVCF inverter auxiliary power supply device 12 is suppressed. It can be avoided.

Next, a fifth embodiment of the present invention will be described with reference to FIGS. In the vehicle power supply control device according to the fifth embodiment, the load of the cooling equipment that consumes a large amount of auxiliary power is greatly influenced by the riding rate. When the response load exceeds a predetermined reference value, the changeover switch 13 is provided so that the passenger is full and needs cooling today, and therefore the CVCF inverter auxiliary power supply 12 is backed up by the VVVF inverter 6 for the cooling load. Is switched. In order to achieve this object, the vehicle power supply control device according to the fifth embodiment takes in the adaptive load signal 32 of the vehicle and compares it with a predetermined level value. 13 is provided with a switching control unit 33 for performing a switching operation. Note that, for the other components, the same portions as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the vehicle power supply control apparatus according to the fifth embodiment, as shown in the timing chart of FIG. 10, since a large number of passengers got in at the station A, the adaptive load of the vehicle increased and the predetermined level value was reduced. If it exceeds, the switching control unit 32 switches the changeover switch 13 to switch the VVVF inverter device 6 to the CVCF inverter operation, and
The backup of the CF inverter auxiliary power supply device 12 was performed, the auxiliary power supply capacity was doubled, and the number of passengers getting off at station B was large, and the adaptive load fell below a predetermined level.
3 is returned to the original state, the VVVF inverter device 6 is again operated as a VVVF inverter, and the auxiliary power capacity is CV
The power capacity of only the CF inverter auxiliary power unit 12 is
Further, if the load increases due to the large number of passengers getting in at the station C, the VVVF inverter device 6 can be switched to the CVCF inverter operation again to back up the auxiliary power supply device 12. In this manner, in the vehicle power supply control device according to the fifth embodiment, in response to the increase or decrease in the operating load of the cooling equipment depending on the number of passengers, the number of passengers is determined from the change in the adaptive load of the vehicle. When there are many passengers, one of the VVVF inverters is switched to the CVCF inverter operation to back up the CVCF inverter auxiliary power supply to increase the auxiliary power capacity. Electric power can be provided, and overload of the CVCF inverter auxiliary power supply device 12 can be prevented.

In the fifth embodiment, the switching control unit 33 sets the load ratio as 1 as the comparison level value of the adaptive load.
By providing the comparison level setting device 33a that can variably set the response load corresponding to 00% to 250%, it is possible to set the optimum comparison level value according to the actual situation.

[0041]

As described above, according to the first aspect of the present invention,
The switching control means monitors the door opening / closing operation of the vehicle, controls the switching operation of the switching means in response to the door opening / closing operation, and assists one of the variable voltage variable frequency inverters in parallel with the auxiliary power supply. Power supply is supplied to the on-vehicle equipment, so the cool air leaks out of the room especially when the door is opened and closed during the cooling operation in summer, requiring large power from the auxiliary power supply to increase the cooling capacity In this case, the large power required for the auxiliary power supply can be backed up by one of the variable voltage variable frequency inverter devices, and the auxiliary power supply does not need to have a large capacity. The capacity of the auxiliary power supply can be minimized, and there is no need to separately install a dedicated auxiliary power supply for covering the insufficient auxiliary power supply.

According to the second aspect of the present invention, the effective value of the current flowing into the on-vehicle equipment is monitored, and when the effective value exceeds a preset reference value, the large power required for the auxiliary power supply is changed by the variable voltage. Auxiliary power supply is supplied from one of the frequency inverters to the on-vehicle equipment in parallel with the auxiliary power supply so as to be backed up. Therefore, the auxiliary power supply does not need to have a large capacity and fluctuates. The capacity of the auxiliary power supply device can be minimized with respect to the auxiliary power supply load, and it is not necessary to separately provide a dedicated auxiliary power supply device for covering the insufficient auxiliary power supply capacity.

According to the third aspect of the present invention, when the actual current flowing to the on-vehicle equipment is monitored and exceeds a preset reference value, the auxiliary power supply is controlled by one of the variable voltage variable frequency inverters. Since the backup is performed, the capacity of the auxiliary power supply does not need to be large, and the capacity of the auxiliary power supply can be minimized with respect to the fluctuating auxiliary power supply load. There is no need to separately install a dedicated auxiliary power supply for covering the minute.

According to the fourth aspect of the present invention, the switching control means controls the switching operation of the switching means in response to the switching operation of the vehicle for running or powering, and the auxiliary power supply from one of the variable voltage variable frequency inverter devices. Since the auxiliary power is supplied to the on-vehicle equipment in parallel with the device, the auxiliary power is not supplied while operating the auxiliary power at full power. When the line operation is not required, the variable voltage variable frequency inverter device is operated at a constant voltage and constant frequency to back up the auxiliary power supply, reduce the load on the auxiliary power supply device and suppress heat generation, which will occur later The auxiliary power supply alone can cope with a possible temporary overload.

According to the fifth aspect of the present invention, the switching control means monitors the adaptive load of the vehicle, compares it with a predetermined reference value, and controls the switching operation of the switching means according to the magnitude of the reference value. The auxiliary power supply is supplied to the on-vehicle equipment in parallel with the auxiliary power supply from one of the power supply units. Therefore, in a state where the cooling load increases and the riding rate is high, the auxiliary power supply is controlled by one of the variable voltage variable frequency inverters. The auxiliary power supply does not need to have a large capacity, the capacity of the auxiliary power supply can be minimized against a fluctuating auxiliary power load, and the auxiliary power supply capacity is insufficient. There is no need to separately install a dedicated auxiliary power supply for covering the minute.

According to the invention of claim 6, when one of the variable voltage variable frequency inverters is operated in a backup manner in order to supply auxiliary power to the on-vehicle equipment in parallel with the auxiliary power supply, it is synchronized with the auxiliary power supply. Since the operation is performed, the phase of the auxiliary power supply can be matched.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram according to a first embodiment of the present invention.

FIG. 2 is a timing chart showing the operation of the first embodiment.

FIG. 3 is a circuit block diagram according to a second embodiment of the present invention.

FIG. 4 is a timing chart showing the operation of the second embodiment.

FIG. 5 is a circuit block diagram according to a third embodiment of the present invention.

FIG. 6 is a timing chart showing the operation of the third embodiment.

FIG. 7 is a circuit block diagram according to a fourth embodiment of the present invention.

FIG. 8 is a timing chart showing the operation of the fourth embodiment.

FIG. 9 is a circuit block diagram according to a fifth embodiment of the present invention.

FIG. 10 is a timing chart showing the operation of the fifth embodiment.

FIG. 11 is a circuit block diagram of a conventional example.

FIG. 12 is a timing chart showing the operation of the conventional example.

[Explanation of symbols]

2-5 Main motor 6-9 Variable voltage variable frequency (VVVF) inverter device 10 Transformer 11 Load 12 Constant voltage constant frequency (CVCF) inverter device 13 Changeover switch 14 Failure signal 21 Door opening / closing command 22 Switching command 23 Switching control unit 25 Current Detector 26 Load current effective value calculation unit 27 Switching control unit 28 Load current detection unit 29 Switching control unit 29a Reference value setting unit 30 Notch command 31 Switching control unit 32 Adaptive load signal 33 Switching control unit 33a Comparison level setting unit

Claims (6)

[Claims] 1. A plurality of variable voltage variable frequency inverter devices for supplying and controlling electric power to a plurality of main motors for driving a vehicle, and an auxiliary power supply to be supplied to various mounted devices of the vehicle. An auxiliary power supply device for outputting, switching means for supplying the auxiliary power supply from the one of the variable voltage variable frequency inverter devices to the mounted device in parallel with the auxiliary power supply device, and monitoring a door opening / closing operation of the vehicle. And a switching control means for controlling a switching operation of the switching means in response to a door opening / closing operation. 2. A plurality of variable voltage variable frequency inverter devices for supplying and controlling electric power to each of a plurality of main motors for driving a vehicle, and an auxiliary power supply to be supplied to various mounted devices of the vehicle. An auxiliary power supply for outputting; a switching unit for supplying the auxiliary power from the one of the variable voltage variable frequency inverters to the on-board device in parallel with the auxiliary power supply; and detecting a current flowing into the on-board device Calculating an effective value of a current value detected by the auxiliary power supply current detecting means, and performing a switching operation of the switching means when the effective current value exceeds a preset reference value. A vehicle power supply control device comprising: a switching control means for controlling. 3. A plurality of variable voltage variable frequency inverter devices for supplying and controlling electric power to each of a plurality of main motors for driving a vehicle, and an auxiliary power supply to be supplied to various mounted devices of the vehicle. An auxiliary power supply device for outputting, a switching unit for supplying the auxiliary power supply from one of the variable voltage variable frequency inverter devices to the mounted device in parallel with the auxiliary power supply device, and detecting a current flowing to the mounted device. A vehicle power supply comprising: an auxiliary power supply current detection unit; and a switching control unit that controls a switching operation of the switching unit when a current value detected by the auxiliary power supply current detection unit exceeds a preset reference value. Control device. 4. A plurality of variable voltage variable frequency inverter devices for supplying and controlling electric power to each of a plurality of main motors for driving a vehicle, and an auxiliary power supply for supplying various mounted devices of the vehicle. An auxiliary power supply device for outputting, switching means for supplying the auxiliary power supply from one of the variable voltage variable frequency inverter devices to the on-board device in parallel with the auxiliary power supply device, and switching of the running or powering of the vehicle. A vehicle power control device comprising: a switching control unit that controls a switching operation of the switching unit in response to an operation. 5. A plurality of variable voltage variable frequency inverter devices for supplying and controlling electric power to each of a plurality of main motors for driving a vehicle, and an auxiliary power supply for supplying various mounted devices of the vehicle. An auxiliary power supply device for outputting, switching means for supplying the auxiliary power supply to the mounted device in parallel with the auxiliary power supply device from one of the variable voltage variable frequency inverter devices, and monitoring a load adaptation of the vehicle; A vehicle power supply control device comprising: a switching control unit that compares a predetermined reference value and controls a switching operation of the switching unit according to the magnitude of the reference value. 6. When the one variable voltage variable frequency inverter device is operated in parallel with the auxiliary power supply device,
The vehicle power supply control device according to any one of claims 1 to 5, wherein the vehicle power supply control device performs a synchronous operation.