JP3225018B2 - Power supply for vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an auxiliary power supply,
VCF (constant voltage constant frequency) inverter and VVVF
(Variable voltage variable frequency) The present invention relates to a vehicle power supply device using an inverter.

[0002]

2. Description of the Related Art Conventionally, a power supply device for a vehicle includes an auxiliary power supply device as a power supply for an air conditioner (cooler), an interior light, a control device for a vehicle, etc., in addition to a main power supply device for a driving source for traveling. Used.

[0003] By the way, such an auxiliary power supply device has been mainly used a motor generator so far. However, recently, with the progress of power electronics, stationary type converters using semiconductor elements such as GTO thyristors and giant transistors have been used in place of motor generators. A VVVF inverter whose frequency and voltage can be varied is used for an air conditioner, which is a main load, in order to perform optimal control, and a CVCF inverter for supplying commercial power is used for an interior light and a vehicle control device. ing.

[0004]

However, according to the apparatus using such a stationary type converter, the apparatus using the conventional motor generator is technically stable although the maintenance is troublesome. If stable maintenance is performed properly, stable operation with few failures can be expected.However, in the case of a static converter, ordinary maintenance is hardly necessary, but since control is performed by a complicated electronic circuit, noise etc. There is a possibility that the operation may be easily stopped. In the case of the VVVF inverter, such an operation stop of the auxiliary power supply device only stops the operation of the air conditioner and has no significant effect. However, in the case of the CVCF inverter, the control by the vehicle control device becomes difficult and the vehicle control device becomes difficult. In addition to making the car inoperable, the interior lights could also be turned off and cause security problems.

Therefore, conventionally, a dual system is constructed by using two CVCF inverters, and one of the CVCF inverters is always used to supply power to the load. The CVCF inverter has been switched to enable continuous power supply to the load. However, always preparing such unused inverters is not only wasteful in equipment but also disadvantageous in terms of economy.

The present invention has been made in view of the above circumstances, and provides an economically advantageous vehicle power supply device capable of continuing to supply power to a required minimum load even if a CVCF inverter fails. The purpose is to:

[0007]

According to the first aspect of the present invention,
A constant voltage / constant frequency inverter connected to a DC power supply and supplying output power to a first load via an AC filter; and a variable voltage variable connected to the DC power supply and supplying output power to a second load. A frequency inverter,
An output side of the variable voltage variable frequency inverter, switch means for connecting the output side of the constant voltage constant frequency inverter and the AC filter, and detecting a failure of the constant voltage constant frequency inverter, together to switch the frequency inverter to the constant-voltage constant-frequency operation, by closing the switch means, before the constant-voltage constant-frequency output power from the variable voltage variable frequency inverter
Switching means for supplying the first load via the AC filter .

As a result, according to the first aspect of the present invention,
When the constant-voltage / constant-frequency inverter stops operating to supply power to the first load by the inverter, the switching operation of the switching means causes the variable-voltage / variable-frequency inverter to operate at a constant-voltage / constant-frequency, and the output power is reduced to the As a result, the vehicle can be controlled continuously by the vehicle control device used as the first load, and the lighting of the interior light can be continued, so that safety in safety can be improved. Can also be secured.
Then, the output of the variable voltage variable frequency inverter is supplied to the first load through an AC filter connected to the output side of the constant voltage constant frequency inverter, so that the variable voltage variable frequency inverter has a new AC filter. , It is possible to remove the high frequency component and supply power to the first load.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a circuit configuration of the embodiment. In the figure, reference numeral 1 denotes a pantograph, and the pantograph 1 is configured to collect DC power from an overhead wire (not shown). Then, the DC power obtained from the pantograph 1 is supplied to the DC / DC converter 2. The DC / DC converter 2 always outputs a constant DC voltage with respect to a variation in the overhead line voltage.

The output of the DC / DC converter 2 is CVC
F inverter 3 and VVVF inverter 4. The CVCF inverter 3 outputs a constant-voltage / constant-frequency output including a high-frequency component, that is, an AC power of a commercial frequency including a high-frequency component by the switching operation. The output of the CVCF inverter 3 is applied to an AC filter 6 via a switch 5, where the high frequency component is removed, and the output is applied to a load 7. In this case, the load 7 includes an in-vehicle light and a vehicle control device driven by a commercial power supply. The switch 5 opens when the operation of the CVCF inverter 3 stops.

The VVVF inverter 4 outputs a variable frequency AC power including a high frequency component by its switching operation. The output of the VVVF inverter 4 is provided to a load 9 via a switch 8.
In this case, the load 9 is configured by a compressor of an air conditioner (cooler) in which the optimal control is performed by the AC power of the variable frequency. The switch 8 opens in synchronization with the switch 5 when the operation of the CVCF inverter 3 stops.

The output of the VVVF inverter 4 is supplied to the AC filter 6 via a switch 10. The switch 10 closes when the operation of the CVCF inverter 3 stops.
The auxiliary switch 11 linked to the switch 10 is connected to the VVVF inverter 4. This auxiliary switch 11 is for forcibly shifting the VVVF inverter 4 to the commercial frequency operation.

Next, the operation of the embodiment configured as described above will be described. When the operation of the CVCF inverter 3 is normal, the switches 5 and 8 are closed, and the switch 10 and the auxiliary switch 11 are open.

In this state, when DC power is collected from an overhead wire (not shown) by the pantograph 1, the DC power becomes D
It is provided to C / DC converter 2. And DC / D
The constant DC voltage output from C converter 2 is CV
It is provided to CF inverter 3 and VVVF inverter 4.

Then, the CVCF inverter 3 outputs a constant-voltage / constant-frequency output including a high-frequency component, that is, AC power of a commercial frequency including a high-frequency component, and is supplied to the AC filter 6 via the switch 5. Then, the high frequency component is removed by the AC filter 6 and applied to the load 7, so that the control device and the interior light of the vehicle are driven by the commercial power supply. On the other hand, the VVVF inverter 4 also outputs variable-frequency AC power including high-frequency components and supplies the variable-frequency AC power to the load 9 via the switch 8. The compressor of the vehicle air conditioner (cooler) performs optimal control using the variable frequency AC power. Will be performed.

In this state, when a failure occurs in the CVCF inverter 3 and the operation is stopped, the switches 5 and 8 are switched to the open state, and the switch 10 and the auxiliary switch 11 are switched to the closed state.

Then, when the switch 5 is opened, the CVC
The F inverter 3 is disconnected, and the load 9 such as a vehicle air conditioner (cooler) is also disconnected by opening the switch 8. Further, the closing operation of the switch 10 causes the VVVF inverter 4 to be connected to the AC filter 6 side.
In this state, the VVVF inverter 4 operates the auxiliary switch 1
1 forcibly shifts to the commercial frequency operation, so that the commercial frequency AC power including the high frequency component by the VVVF inverter 4 is supplied to the AC filter 6 where the high frequency component is removed and the load 7 is removed. And the control device and the interior light of the vehicle are driven.

Accordingly, when the operation of the CVCF inverter 3 is stopped, the power supply to the load 7 can be continued using the sound VVVF inverter 4. In addition to the difficulty of control by the vehicle control device, the vehicle running becomes impossible, and the vehicle running control by the vehicle control device can be performed more reliably than the one in which the interior light is turned off and a problem occurs in security. At the same time, the lighting of the interior light can be continued, and safety in security can be ensured. In this case, since the power supply to the load 9 by the VVVF inverter 4 is stopped, the operation of the air conditioner is stopped, and a decrease in service to passengers is inevitable. It can be minimized.

Also, compared with a conventional system using two CVCF inverters to form a dual system, there is no need to prepare an inverter that is not used at all times, so that waste in equipment can be eliminated. It can be economically advantageous.

It should be noted that the present invention is not limited to the above-described embodiment, and can be appropriately modified and implemented without changing the gist. For example, in the above-described embodiment, a contact switch 5 is used as switching means for switching the VVVF inverter 4 to the load 7 side by stopping the operation of the CVCF inverter 3.
Although 8, 10, and 11 are used, a non-contact semiconductor switch can be used for such a switching means.

[0021]

According to the present invention, when power supply to the first load becomes impossible due to the stoppage of the operation of the constant voltage constant frequency inverter, the switching operation of the switching means causes the variable voltage variable frequency inverter to operate in the constant voltage constant frequency operation. By letting
The output power can be continuously supplied to the first load. At this time, power can be supplied from the variable voltage variable frequency inverter to the first load via the constant voltage constant frequency side AC filter, so that a high frequency component can be supplied without providing a new AC filter on the variable voltage side. The removed power can be supplied to the first load.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a circuit configuration according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Pantograph, 2 ... DC / DC converter, 3 ... CVCF inverter, 4 ... VVVF inverter, 6 ... AC filter, 7, 9 ... Load, 5, 8, 10, 11 ... Switch.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B60L 1/00 B60L 9/18 H02M 7/48

Claims (1)

(57) [Claims] 1. A constant voltage / constant frequency inverter connected to a DC power supply and supplying output power to a first load via an AC filter; and an output power connected to the DC power supply and supplied to a second load. A variable voltage variable frequency inverter to be supplied; an output side of the variable voltage variable frequency inverter; switch means for connecting between the output side of the constant voltage constant frequency inverter and the AC filter; By detecting the failure and switching the variable voltage variable frequency inverter to the constant voltage constant frequency operation and closing the switch means, the constant voltage constant frequency output power from the variable voltage variable frequency inverter is filtered by the AC filter. Through the first
Switching means for supplying the load to the load.