JPH1014133A - Power backup device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continue the power supply to AC load stably by switching the output circuit of an optional inverter device from a vehicle motor to AC load, out of a plurality of inverters for a vehicle at the tie of fault of an inverter device for power supply to AC load. SOLUTION: If fault occurs in a CVCF inverter 10c, each changeover switch is switched interlockedly, and changeover switches 15a, 15c, 16a, and 16c are opened, and changeover switches 15b and 16b are closed. On the other hand, a VVVF inverter 10b is changed over to the i/o circuit of the CVCF inverter 10c at the time of i/o circuit being sound by opening the changeover switches 15a, 16a and closing the switches 15b, 16b. Therefore, the VVVF inverter 10b converts the voltage of a DC power source 1 inputted through a DC high-speed breaker 2b, a DC reactor 4c, and a changeover switch 15b into AC, and supplies it to AC load 12 through the changeover switch 16b and an inverter transformer 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle for performing a power supply backup and a stable power supply to an AC load even when an AC load power supply inverter device for supplying an AC load mounted on the vehicle fails. The present invention relates to a power backup device.

[0002]

2. Description of the Related Art As is well known, a vehicle includes a vehicle inverter device as a variable voltage variable frequency power supply for driving a vehicle motor connected to an axle, and a predetermined power supply for supplying power to an AC low-voltage equipment mounted on the vehicle. An AC load power supply inverter device as a voltage predetermined frequency power supply is provided as a power supply facility. For example, in a train having eight trains as one train, usually two or four vehicle inverters are installed for two to three cars, and only one arbitrary car is exchanged. An inverter device for load power supply is installed. Further, the inverter device for supplying AC load is a vehicle 1
Although only one unit is mounted on the train, it supplies power to AC loads such as an AC compressor for brake control and an air conditioner in the vehicle, and is an important facility as a power supply facility.

FIG. 8 is a circuit diagram of a conventional vehicle power supply device described in, for example, Japanese Patent Application Laid-Open No. 5-64455. In FIG. 8, 1 is a high-voltage DC power supply, 2 is a DC high-speed circuit breaker inserted into an output circuit of the DC power supply, 3 is a switching element for a chopper, and 4 is an input provided on the input side of the switching element. DC reactor for 5
Is a filter capacitor for input provided on the input side of the switching element 3, 6 is a flywheel diode for chopper, 7 is a DC reactor for output provided on the output side of the switching element 3, and 8 is the same switching element. The switching element 3, filter capacitors 5 and 8, the flywheel diode 6, and the DC reactor 7 constitute a chopper circuit 9 with an output filter capacitor provided on the output side of 3. Reference numeral 10 denotes an AC load power supply inverter device (hereinafter referred to as a CVCF inverter) for converting DC into AC having a predetermined voltage and a predetermined frequency in which the switching elements 10a to 10f are connected to a three-phase bridge, and 11 denotes an output of the CVCF inverter 10. A transformer for an inverter provided on the side is an AC load such as an AC compressor and an air conditioner.

[0004] Next, the operation of the conventional vehicle power supply device configured as described above will be described. First, when the DC high-speed circuit breaker 2 is turned on, the voltage of the DC power supply 1 is changed via the DC high-speed circuit breaker 2 and the DC reactor 4 to the chopper circuit 9.
Is applied to the filter capacitor 5. Chopper circuit 9
The switching element 3, which controls the main operation of the above, is ON-OFF controlled by a conduction ratio control device (not shown) to adjust the passing current and adjust the voltage across the filter capacitor 8 to a predetermined voltage. The filter capacitor 8 serves as a power source for the CVCF inverter 10, and the power is finally supplied to an AC load 12 such as an AC compressor or an air conditioner. The conduction ratio of the switching element 3 is controlled and adjusted so that the voltage supplied to the switch 12 becomes constant. CVCF comprising switching elements 10a to 10f
The inverter 10 uses the filter capacitor 8 as a DC power supply, converts the DC into a three-phase AC, and outputs the AC to the inverter transformer 11. Next, the inverter transformer 11 sets C
The AC voltage output from the VCF inverter 10 is boosted or stepped down and supplied to the AC load 12. Although the vehicle inverter for supplying power to the vehicle motor is not shown in the vehicle power supply device shown in FIG. 8, it is actually provided separately and independently.

[0005]

The conventional vehicle power supply device is configured as described above, and only one AC load power supply inverter device is mounted for one vehicle set. When the AC load power supply inverter device breaks down, there is a problem that a stable AC power cannot be supplied to the AC load.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem. Even when an AC load power supply inverter device fails, the power supply to the AC load is backed up and the AC load is supplied. It is an object of the present invention to obtain a power supply backup device for a vehicle in which power supply to a vehicle can be stably continued.

[0007]

According to a first aspect of the present invention, there is provided a vehicle power supply backup device which converts a direct current supplied from a direct current power supply into an alternating current having a variable voltage and a variable frequency, and supplies power to a vehicle motor. An inverter device for converting a DC supplied from a DC power supply into an AC having a predetermined voltage and a predetermined frequency, and supplying the AC load with an AC load. Switching means for switching an output circuit of any vehicle inverter device from a vehicle motor to an AC load among the vehicle inverter devices, and supplying an AC having a predetermined voltage and a predetermined frequency from the arbitrary vehicle inverter device to the AC load. It is a thing.

A vehicle power supply backup device according to a second aspect of the present invention includes a plurality of vehicle inverter devices for converting a DC supplied from a DC power supply into an AC having a variable voltage and a variable frequency and supplying power to a vehicle motor. An AC load power supply inverter that converts a DC supplied from a DC power supply into an AC having a predetermined voltage and a predetermined frequency, and supplies an AC load; and a failure detection device that detects a failure of the AC load power supply inverter. Among the plurality of vehicle inverter devices, a switching device operated by an output signal of the failure detection device includes:
Switching means for switching an output circuit of an arbitrary vehicle inverter device from a vehicle motor to an AC load.

According to a third aspect of the present invention, in the vehicle power supply backup device according to the first or second aspect, an arbitrary vehicle inverter device and an AC load power supply inverter device are the same. It is designed to be installed in a vehicle.

According to a fourth aspect of the present invention, there is provided a vehicle power supply backup device which converts a DC supplied from a DC power supply into an AC having a variable voltage and a variable frequency, and supplies power to a vehicle motor; A first AC load power supply inverter that converts a DC supplied from a power supply into an AC having a predetermined voltage and a predetermined frequency and supplies power to the AC load, and is always synchronously operated with the first AC load power supply inverter. A second AC load power supply inverter device for converting a DC supplied from a DC power supply into an AC having a predetermined voltage and a predetermined frequency and supplying the AC load with the AC power. When one of the inverter devices breaks down, power is supplied to the AC load only by the other second or first AC load power supply inverter device.

Further, a vehicle power supply backup device according to a fifth aspect of the present invention is a vehicle inverter device for converting a DC supplied from a DC power supply into an AC having a variable voltage and a variable frequency and supplying power to a vehicle motor; An inverter for feeding an AC load that converts a DC supplied from a power supply into an AC having a predetermined voltage and a predetermined frequency, and supplies an AC load with an AC load. A backup inverter device for converting into an alternating current. The backup inverter device supplies an alternating current of a variable voltage and a variable frequency to the vehicle motor when the vehicle inverter device fails. Sometimes, an alternating current having a predetermined voltage and a predetermined frequency is supplied to an AC load.

Further, a vehicle power supply backup device according to a sixth aspect of the present invention is a vehicle inverter device for converting a DC supplied from a DC power supply into an AC having a variable voltage and a variable frequency and supplying power to a vehicle motor; A first and a second AC load power supply inverter capable of converting a DC supplied from a power supply into an AC having a predetermined voltage and a predetermined frequency and supplying power to an AC load; a first AC load power supply inverter and a second AC load power supply inverter; A switching switch for switching an output circuit of the inverter for AC load power supply with respect to the AC load, wherein the first and second AC load power supply inverters are normally operated by the changeover switch while operating the first and second AC load power supply inverter devices. Power is supplied to the AC load from one of the devices, and is switched when an abnormality occurs in one of the first and second AC load power supply inverter devices. It is obtained so as to power the AC load from the other by a switch.

According to a seventh aspect of the present invention, there is provided a vehicle power supply backup device according to the first aspect, further comprising a sensor for detecting an output of an AC load power supply inverter device. When the output of the inverter device falls below a predetermined value, the output circuit of the vehicle inverter device is switched to an AC load. Further, the vehicle power supply backup device according to claim 8 of the present invention is the vehicle power supply backup device according to claim 1 or 2, wherein an AC load supply inverter device supplies power to an AC load from an arbitrary vehicle inverter device when the AC load supply inverter device fails. In this circuit, an AC reactor is provided.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In the figure, 1 is a high-voltage DC power supply, 2
Reference numerals a and 2b denote DC high-speed circuit breakers, 4a to 4c denote DC reactors, 10a and 10b denote vehicle inverter devices (hereinafter referred to as Vs) for converting input DC into AC having a variable voltage and variable frequency.
It is called a VVF inverter. ), 10c is an AC load power supply inverter device (hereinafter, referred to as a CVCF inverter) for converting an input DC into an AC having a predetermined voltage and a predetermined frequency.
And mounted on the same vehicle as the VVVF inverters 10a and 10b. 11 is a CVCF inverter 10c
Inverter provided on the output side of the inverter, 12 is an AC load, 13a and 13b are DC contactors, and 14a and 14b are supplied with AC of variable voltage variable frequency output from VVVF inverters 10a and 10b. Vehicle motors 15a, 15b, 15 for driving the axles of the vehicle at different rotational speeds
c is a changeover switch provided on the input side of the VVVF inverter 10b and the CVCF inverter 10c;
a, 16b and 16c are VVVF inverters 10b and C
A change-over switch provided on the output side of the VCF inverter 10c, the change-over switches 16a, 16b, 1
6c and the changeover switches 15a, 15b, 15c
Are opened and closed in conjunction with each other.

Next, the operation will be described. Now, CV
When the CF inverter 10c is in a healthy state, the changeover switches 15a, 15c, 16a, 16c are closed, and the changeover switches 15b, 16b are open. In this state, the VVVF inverter 10a converts the voltage of the DC power supply 1 input via the DC high-speed circuit breaker 2a, the DC contactor 13a, and the DC reactor 4a into an AC having a variable voltage and variable frequency, and supplies the AC to the vehicle motor 14a. The vehicle motor 14a rotates the axle of the vehicle according to the output of the VVVF inverter 10a. Similarly, VVV
The F inverter 10b converts the voltage of the DC power supply 1 input via the DC high-speed circuit breaker 2a, the DC contactor 13b, the DC reactor 4b, and the changeover switch 15a into an AC having a variable voltage and a variable frequency, and outputs the AC to the vehicle motor 14b. And the vehicle motor 14b is connected to the VVVF inverter 10b.
The axle of the vehicle is rotationally driven according to the output of the vehicle.

On the other hand, the CVCF inverter 10c converts the voltage of the DC power supply 1 input through the DC high-speed circuit breaker 2b, the DC reactor 4c, and the changeover switch 15c into an AC having a predetermined voltage and a predetermined frequency, and converts the voltage through the inverter transformer 11. To the AC load 12, and the AC load 12 performs a normal operation by the supplied AC. In this state, if a failure occurs in the CVCF inverter 10c, the changeover switches are switched in conjunction with each other, the changeover switches 15a, 15c, 16a, 16c are opened, and the changeover switches 15b, 16b are closed. As a result, the power supply from the VVVF inverter 10b to the vehicle motor 14b is cut off by opening the switch 16a,
The axle cannot be driven, but the vehicle is
When the vehicle is driven by the vehicle 4a and several vehicles are organized, the vehicle motor is driven by a VVVF inverter installed in another vehicle, so that there is no problem in running. The failed CVCF inverter 10c has its input / output circuit disconnected from the circuit by opening the changeover switches 15c and 16c. On the other hand, the input / output circuit of the VVVF inverter 10b is switched to the input / output circuit of the CVCF inverter 10c in a normal state by opening the changeover switches 15a and 16a and closing the changeover switches 15b and 16b. Therefore, the VVVF inverter 1
Ob converts the voltage of the DC power supply 1 input through the DC high-speed circuit breaker 2b, the DC reactor 4c, and the changeover switch 15b into AC, and supplies the AC to the AC load 12 through the changeover switch 16b and the inverter transformer 11.

Here, since it is necessary to supply an alternating current of a predetermined voltage and a predetermined frequency to the AC load 12, the inverter device 10b starts the operation of outputting the alternating current of the variable voltage and the variable frequency before the failure (VVVF operation) to the predetermined voltage. The operation must be switched to an operation that outputs an alternating current of frequency (CVCF operation). However, a control program for the VVVF operation and a control program for the CVCF operation are stored in a ROM that stores a control program for controlling the inverter 10b. If the control program is switched in accordance with the switching operation of the changeover switches 15a to 15c and 16a to 16c, it is possible to easily switch from VVVF operation to CVCF operation. Here, according to the first embodiment,
Since the input / output circuit of the VVVF inverter 10b is switched to the input / output circuit of the CVCF inverter 10c in the normal state by the changeover switch, power can be supplied to the AC load under the same conditions as those in the normal state. Further, since the power supplied to the AC load is supplied via the DC high-speed circuit breaker 2b, the current flowing through the DC high-speed circuit breaker 2a does not increase, and unnecessary trip accidents can be prevented. effective.

Embodiment 2 FIG. FIG. 2 is a diagram showing a second embodiment of the present invention, in which the same parts as those in the first embodiment shown in FIG. 2, reference numerals 17a to 17c denote electromagnetic contactors for direct current, and 18a to 18c.
c is an AC electromagnetic contactor, which corresponds to the changeover switches 15a to 15c and 16a to 16c in FIG. Reference numeral 19b denotes a control device of the CVCF inverter 10c, and when the failure of the CVCF inverter 10c is detected, the DC electromagnetic contactors 17a to 17c and the AC electromagnetic contactor 1
A fault detection signal is generated at 8a to 18c to perform a switching operation. 19a is the VVVF inverter 10
b, which switches the inverter 10b from VVVF operation to CVCF operation in response to a failure detection signal generated by the control device 19b.

That is, when the CVCF inverter 10c is in a healthy state, the failure detecting signal is not generated from the control device 19b, so that the DC electromagnetic contactors 17a and 17c and the AC electromagnetic contactors 18a and 18c are closed and the DC The electromagnetic contactor 17b for AC and the electromagnetic contactor 18b for AC are open. In this healthy state, the vehicle motors 14a and 14b are supplied with AC of variable voltage and variable frequency output from the VVVF inverters 10a and 10b to rotationally drive the axle, while the output of the CVCF inverter 10c is output to the AC load. An alternating current of a predetermined voltage and a predetermined frequency is supplied. Now, when the control device 19b detects a failure due to a loss of the output voltage of the CVCF inverter 10c or the like, a failure detection signal is generated in the DC electromagnetic contactors 17a to 17c and the AC electromagnetic contactors 18a to 18c. Vessels 17a, 1
7c and the AC electromagnetic contactors 18a and 18c are opened, and the DC electromagnetic contactor 17b and the AC electromagnetic contactor 18b are closed. As a result, the vehicle motor 14b and the CVCF inverter 10c are disconnected from the circuit as in the first embodiment of FIG. The inverter 10b is connected to the control device 19b
The operation mode is switched from the VVVF operation to the CVCF operation by the control device 19a having received the failure detection signal. As a result, the AC load 12 is supplied with AC having a predetermined voltage and a predetermined frequency output from the inverter 10b, and can operate in the same manner as in a normal state.

Embodiment 3 FIG. 3 is a view showing a third embodiment of the present invention, and the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals. In FIG. 3, 20a, 20b,
Reference numerals 21a and 21b denote changeover switches, and reference numeral 24 denotes a VVVF inverter device, which incorporates a CVCF inverter unit 10d together with the VVVF inverters 10a and 10b. That is, when the CVCF inverter 10c is in a healthy state, the changeover switches 20b and 21b are closed, and
21a is open, and power is supplied to the AC load 12 by the CVCF inverter 10c. Now, CVC
When a failure occurs in the F inverter 10c, the changeover switches 20a, 20b, 21a, 21b are switched, and C
The VCF inverter unit 10d is operated in the CVCF to supply power to the AC load 12 and perform the same operation as in the normal state.

Embodiment 4 FIG. FIG. 4 is a view showing a fourth embodiment of the present invention, and the same parts as those in FIGS. 1 to 3 are denoted by the same reference numerals. In FIG. 4, reference numerals 22a to 22c and 23a to 23c are changeover switches. In the embodiment shown in FIG. 4, when a failure occurs in the CVCF inverter 10c, the AC load 1 is output from the CVCF inverter unit 10d.
2 and when a failure occurs in the VVVF inverter 14a or 14b, the CVCF inverter unit 10d
The VVF operation is performed to supply power to the vehicle motor 14a or 14b. That is, if all the inverters are healthy, the changeover switches 20b, 21b, 22a, 2
3a is closed and the other changeover switches 20a, 21
a, 22b, 22c, 23b and 23c are opened to supply power to the AC load 12 from the CVCF inverter 10c, and to the vehicle motors 14a and 14b for the VVVF inverter 10c.
Power is supplied from a and 10b.

If the CVCF inverter 10c fails, the changeover switches 20a, 21a, 22a, 23
a, and the other changeover switches 20b, 21b,
By opening 22b, 22c, 23b and 23c, power is supplied to the AC load 12 from the CVCF inverter unit 10d, and power is supplied to the vehicle motors 14a and 14b from the VVVF inverters 10a and 10b. Next, when the VVVF inverter 10a fails, the changeover switch 20
b, 21b, 22b, 22c, 23a are closed, and the other changeover switches 20a, 21a, 22a, 23b, 2
3c, the AC load 12 is supplied with power from the CVCF inverter 10c, and the vehicle motor 14a is supplied with power by driving the inverter unit 10d with VVVF operation.
4b is supplied with power from the VVVF inverter 10b. Further, when the VVVF inverter 10b fails, the changeover switches 20b, 21b, 22a, 23b, 23
c, and the other changeover switches 20a, 21a,
22b, 22c, and 23a are opened to supply power to the AC load 12 from the CVCF inverter 10c, and the vehicle motor 14
a is supplied from the VVVF inverter 10a, and the vehicle motor 14b is supplied with power by the VVVF operation of the inverter unit 10d.

Embodiment 5 FIG. 5 is a view showing a fifth embodiment of the present invention, and the same parts as those in FIGS. 1 to 4 are denoted by the same reference numerals. In FIG. 5, 11a is an inverter transformer provided on the output side of the CVCF inverter unit 10d, and 11b is an inverter transformer provided on the output side of the CVCF inverter 10c. Also, the CVCF inverter unit 10d is always connected to the CVCF inverter 10c.
They are operated synchronously. In the embodiment shown in FIG. 5, the CVCF inverter 10c and the CVCF inverter unit 10d are operated synchronously, so that these two CVCF inverters 10c and
Power is supplied to the AC load 12 by d.

When a failure occurs in the CVCF inverter 10c, the power supply from the CVCF inverter 10c stops, but the CVCF inverter unit 10d is operating normally, and the AC load 12 is supplied with power by the CVCF inverter unit 10d. In this case, an operation such as switching is not required, and the power supply is backed up instantaneously, and the stability of power supply to the AC load is improved. Similarly, when the CVCF inverter unit 10d fails, power is supplied to the AC load 12 by the normally operating CVCF inverter 10c.

Embodiment 6 FIG. FIG. 6 shows a sixth embodiment of the present invention, in which the same parts as those in FIGS. 1 to 5 are denoted by the same reference numerals. 6, the CVCF inverter unit 10d is built in the VVVF inverter device 24 as in FIG. The CVCF inverter 10c corresponds to the first AC load power supply inverter device according to claim 6, and the CVCF inverter unit 10d corresponds to the second AC load power supply inverter device according to claim 6. Is what you do. 25a and 25
Reference numeral b denotes a changeover switch that is operated in conjunction with each other to switch the output circuits of the CVCF inverter 10c and the CVCF inverter unit 10d that supply power to the AC load 12.

When the CVCF inverter 10c is operating normally, the changeover switch 25a is closed and the changeover switch 25b is open. And CVCF
Power is supplied to the AC load 12 by the inverter 10c. On the other hand, the CVCF inverter unit 10d
Although the operation is always synchronized with the F inverter 10c, the changeover switch 25a is closed and the changeover switch 25b
Is open, the CVCF inverter unit 10d
Is not supplied to the AC load 12. That is, when the changeover switches 25a and 25b are switched, the CVCF inverter unit 10d always supplies power to the AC load 12 with the same voltage and frequency as the power supplied to the AC load 12 by the CVCF inverter 10c. Driving.

Now, when a failure occurs in the CVCF inverter 10c, this is detected and the changeover switch 25a
Is opened, and the changeover switch 25b is closed. With this switching operation, the power supply from the CVCF inverter 10c to the AC load 12 is stopped, and the CVCF inverter 10c is supplied from the CVCF inverter unit 10d to the AC load 12.
The power supply with the same power as the power from is started. For this reason,
The effect on the load due to the failure of the CVCF inverter 10c is avoided. Even when the CVCF inverter 10c fails, the VVV is applied to the vehicle motors 14a and 14b.
Since the power supply from the F inverters 10a and 10b is continued, the vehicle motors 14a and 14b operate normally without reducing the power supply.

Embodiment 7 FIG. 7 is a view showing a seventh embodiment of the present invention, and the same parts as those in FIGS. 1 to 6 are denoted by the same reference numerals. In FIG. 7, 26 is an AC load 1
2 is a sensor (hereinafter, referred to as a voltage sensor) that detects a decrease in the AC voltage supplied to the power supply 2. Voltage sensor 26 is CVCF
When the inverter 10c operates normally and power is supplied from the CVCF inverter 10c to the AC load 12, the CVC
It is provided to detect a decrease in the output of the CVCF inverter 10c due to a failure of the F inverter 10c or the like. 27a is a control device of the CVCF inverter 10c. When the voltage detected by the voltage sensor 26 becomes lower than a preset voltage, the control device 27a
When it is determined that some abnormality has occurred in the F inverter 10c, a failure detection signal is generated in the AC electromagnetic contactors 18a, 18b, and 18c, and the switching operation is performed. 2
Reference numeral 7b denotes a control device for the VVVF inverter 10b.
The F inverter 10b is switched from VVVF operation to CVCF operation. Reference numeral 28 denotes an AC reactor for suppressing harmonics, which is provided in series with the AC electromagnetic contactor 18b, that is, provided in a circuit for supplying power from the VVVF inverter 10b to the AC load.

When the CVCF inverter 10c is operating normally, the AC electromagnetic contactors 18a and 18c are closed,
The AC electromagnetic contactor 18b is opened, and power is supplied to the AC load 12 from the CVCF inverter 10c. Now, CV
If an abnormality occurs in the CF inverter 10c and the output of the CVCF inverter 10c decreases, the AC voltage supplied to the AC load 12 decreases. When the voltage detected by voltage sensor 26 becomes lower than a preset voltage, control device 27a determines that some abnormality has occurred in CVCF inverter 10c, generates a failure detection signal, and generates AC electromagnetic contactors 18a, 18c. And close 18b. At the same time, the control device 27b receives the failure detection signal of the control device 27a and sets the VVVF inverter 10b to VVV.
Switch from F operation to CVCF operation. Voltage sensor 26
Is provided, when an abnormality occurs in the CVCF inverter 10c, the abnormality can be promptly detected and the switching operation can be automatically performed. In addition, since the AC reactor 28 is provided, it is possible to suppress harmonic components generated when switching the power supply from the VVVF inverter 10b to the AC load 12, to improve the reliability of each device configuring the AC load 12, and to reduce the induction trouble. This has the effect of reducing the problem.

[0030]

As described above, according to the first aspect of the present invention, when the AC load power supply inverter fails, the output circuit of any vehicle inverter among the plurality of vehicle inverters can be used. Since the vehicle motor is switched to an AC load, and an AC of a predetermined voltage and a predetermined frequency is supplied to the AC load from the arbitrary vehicle inverter device,
There is an effect that the power supply to the AC load becomes stable and the reliability can be improved.

According to the second aspect of the present invention, there is provided a failure detecting device for detecting a failure of the inverter device for supplying an AC load, and a plurality of vehicle inverters are provided by a switching device operated by an output signal of the failure detecting device. Among the devices, the output circuit of any vehicle inverter device is switched from the vehicle motor to the AC load, so that the power supply is automatically backed up in conjunction with the failure of the AC load power supply inverter device, and the AC load There is an effect that power supply becomes stable and reliability can be improved.

According to the third aspect of the present invention, since the vehicle inverter device and the AC load power supply inverter device are installed in the same vehicle, it is possible to prevent useless wiring between vehicles. There is. According to the fourth aspect of the present invention, the first and second AC load power supply inverter devices that are operated synchronously are provided, and when one of the first or second AC load power supply inverter device is out of order, the other is used. The second or first AC load power supply inverter device has an effect of stabilizing power supply to an AC load configured to supply power to the AC load, thereby improving reliability. Moreover, the switching operation is not required, and the power supply is backed up instantaneously, so that the stability of the power supply to the AC load is improved.

According to a fifth aspect of the present invention, there is provided a backup inverter for converting a DC supplied from a DC power supply into an AC having a variable voltage and a variable frequency or an AC having a predetermined voltage and a predetermined frequency. In the event of a failure, an AC of a variable voltage and a variable frequency is supplied to the vehicle motor, and in the event of a failure of the AC load power supply inverter device, an AC of a predetermined voltage and a predetermined frequency is supplied to the AC load. This has the effect of stabilizing the power supply to the device and improving the reliability.

According to the invention of claim 6, there are provided first and second AC load power supply inverter devices capable of supplying power to an AC load, and the first and second AC load power supply inverter devices are constantly operated. The AC load is supplied from one of the first and second AC load power supply inverter devices by a changeover switch, and when an abnormality occurs in one of the first and second AC load power supply inverter devices, the changeover switch supplies the AC load from the other. Since power is supplied to the AC load, power supply to the AC load and the vehicle motor is stabilized with a simple configuration, and there is an effect that reliability can be improved.

According to the seventh aspect of the present invention, a sensor for detecting the output of the AC load power supply inverter device is provided, and it is detected that the output of the AC load power supply inverter device has dropped below a predetermined value. Since the output circuit of the vehicle inverter device is switched to an AC load, when an abnormality occurs in the AC load power supply inverter device, the abnormality is automatically detected and power supply to the AC load is supplied to the vehicle inverter device. Can be switched to Claim 8
According to the invention according to the present invention, the AC reactor for suppressing harmonics is provided in the connection circuit that connects the output side of the vehicle inverter device and the output side of the AC load supply inverter device. Is supplied to the AC load via the AC reactor, and there is an effect that harmonic components generated when switching the power supply from the vehicle inverter device to the AC load can be suppressed.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a vehicle power supply backup device according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a vehicle power supply backup device according to a second embodiment of the present invention.

FIG. 3 is a circuit diagram showing a vehicle power supply backup device according to a third embodiment of the present invention.

FIG. 4 is a circuit diagram showing a vehicle power supply backup device according to a fourth embodiment of the present invention.

FIG. 5 is a circuit diagram showing a vehicle power supply backup device according to a fifth embodiment of the present invention.

FIG. 6 is a circuit diagram showing a vehicle power supply backup device according to a sixth embodiment of the present invention.

FIG. 7 is a circuit diagram showing a vehicle power supply backup device according to a seventh embodiment of the present invention.

FIG. 8 is a circuit diagram showing a conventional vehicle power supply backup device.

[Explanation of symbols]

1 DC power supply, 2a, 2b DC high-speed circuit breaker, 4
a to 4c DC reactor, 10a, 10b Inverter for vehicle, 10c Inverter for AC load power supply, 11, 11a, 11b Inverter transformer, 1
2 AC load, 13a, 13b DC contactor, 14
a, 14b Vehicle motor, 15a to 15c, 16a to 1
6c changeover switch, 17a-17bc DC magnetic contactor, 18a-18c AC magnetic contactor, 19
a, 19b Control device, 20a, 20b, 21a, 21
b 22a-22c, 23a-23c changeover switch, 24 vehicle inverter device, 25a, 25b changeover switch, 26 voltage sensor, 27a, 27b
Control device.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location H02M 7/48 9181-5H H02M 7/48 T

Claims (8)

[Claims] A plurality of vehicle inverter devices for converting a DC supplied from a DC power supply into an AC having a variable voltage and a variable frequency and supplying power to a vehicle motor, and converting the DC supplied from the DC power supply into an AC having a predetermined voltage and a predetermined frequency. An AC load power supply inverter device that converts and supplies power to an AC load. When the AC load power supply inverter device fails, an output circuit of an arbitrary vehicle inverter device among the plurality of vehicle inverter devices is supplied from a vehicle motor. A power supply backup device for a vehicle, comprising switching means for switching to a load and feeding an AC having a predetermined voltage and a predetermined frequency from the arbitrary vehicle inverter device to the AC load. 2. A plurality of vehicle inverter devices for converting a DC supplied from a DC power supply into an AC having a variable voltage and a variable frequency and supplying power to a vehicle motor, and converting the DC supplied from the DC power supply into an AC having a predetermined voltage and a predetermined frequency. A plurality of inverters for a vehicle using an AC load power supply inverter device for converting and supplying power to an AC load, a failure detection device for detecting a failure of the AC load power supply inverter device, and a switching device operated by an output signal of the failure detection device; A power supply backup device for a vehicle, comprising switching means for switching an output circuit of an arbitrary vehicle inverter device from a vehicle motor to an AC load. 3. The vehicle power supply backup device according to claim 1, wherein an arbitrary vehicle inverter device and an AC load power supply inverter device are installed in the same vehicle. 4. A vehicle inverter device for converting a DC supplied from a DC power supply into an AC having a variable voltage and a variable frequency, and converting a DC supplied from the DC power supply into an AC having a predetermined voltage and a predetermined frequency. A first AC load power supply inverter that supplies power to an AC load, and is always operated synchronously with the first AC load power supply inverter to convert a DC supplied from a DC power supply into an AC having a predetermined voltage and a predetermined frequency. A second AC load power supply inverter device for converting and supplying power to the AC load, and when one of the first or second AC load power supply inverter device fails, the other second or first AC power supply device A power supply backup device for a vehicle, wherein power is supplied to the AC load only by a load power supply inverter device. 5. A vehicle inverter device for converting a DC supplied from a DC power supply into an AC having a variable voltage and a variable frequency, and converting a DC supplied from the DC power supply into an AC having a predetermined voltage and a predetermined frequency. An inverter device for feeding an AC load to an AC load, a backup inverter device for converting a DC supplied from a DC power supply into an AC having a variable voltage and a variable frequency or an AC having a predetermined voltage and a predetermined frequency. When the vehicle inverter device fails, an alternating current of a variable voltage and variable frequency is supplied to the vehicle motor, and when the inverter device for supplying an AC load fails, an alternating current of a predetermined voltage and a predetermined frequency is supplied to the AC load. Power backup device for vehicles. 6. A vehicle inverter device for converting a DC supplied from a DC power supply into an AC having a variable voltage and a variable frequency, and converting a DC supplied from the DC power supply into an AC having a predetermined voltage and a predetermined frequency. A first and second AC load power supply inverter device capable of supplying power to an AC load, and switching an output circuit for the AC load of the first AC load power supply inverter device and the second AC load power supply inverter device. A changeover switch, and while the first and second AC load power supply inverter devices are normally operated, the changeover switch supplies power to the AC load from one of the first and second AC load power supply inverter devices, When an abnormality occurs in one of the first and second AC load power supply inverter devices, the changeover switch causes the exchange from the other. A power supply backup device for a vehicle, characterized by supplying power to a flow load. 7. A sensor for detecting the output of the AC load power supply inverter device, wherein when the output of the AC load power supply inverter device falls below a predetermined value, the output circuit of the vehicle inverter device is switched to an AC load. The power supply backup device for a vehicle according to claim 1, wherein: 8. The vehicle power supply backup device according to claim 1, wherein an AC reactor is provided in a circuit that supplies power to the AC load from the vehicle inverter device when the AC load supply inverter device fails.