JPH06169535A - Power source unit - Google Patents

Abstract

PURPOSE:To supply economical power source units of enhanced operating ratio by reducing the capacity at start up. CONSTITUTION:A group of power supply units comprising three power source units (1-3) to supply power to loads (5-16), and one back-up power source unit 4 to supply power, in place of a power source unit (1, 2, or 3) if it fails, to the loads to which the failed power source unit was supplying power. When loads require larger power for starting than for steady operation, the loads belonging to first power source unit are divided into two groups; the first power source unit supplies power to start one group of loads, and the back-up power source unit supplies power to start the other group of loads. After starting, the two groups of loads are re-connected into one group and are supplied power from the first power source unit. This applies to the loads belonging to the second power source unit; the loads are started by the second power source unit and back-up unit. Means 23-29 are provided to start up to n-th group of loads separately.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device for supplying electric power to a plurality of loads by using a plurality of power supply devices.

[0002]

2. Description of the Related Art Generally, in a system having a plurality of power supply devices for supplying power to loads such as a plurality of electric motors, a backup power supply device is often prepared for the purpose of improving the reliability of the system. FIG. 3 is a circuit diagram showing a configuration example of this type of system.

In FIG. 3, 1 to 3 are regular power supply devices (hereinafter, simply referred to as "common machine"), 4 are backup power supply devices (hereinafter, simply referred to as "backup machine"), 5
Numerals 16 to 16 are loads such as electric motors, 17 to 19 are switches for turning on a regular machine, and 20 to 22 are switches for turning on a backup machine.

In normal operation, the switches 17 to 19 are on and the switches 20 to 22 are off, and each load group is operated only by the service machines 1 to 3. When a failure occurs in any of the service machines during operation, the service machine in which the failure has occurred is disconnected, and instead, the backup machine 4 is connected to continue operation. For example, when the regular machine 1 fails, the switch 17 is turned off to disconnect the regular machine 1 and the switch 20 is turned on to connect the backup machine 4.

In a system having such a configuration, when a load that requires a larger amount of electric power at the time of startup than at the time of normal operation is started, the capacity of the commercial machine is determined according to the startup capacity of the load, and after startup, the Some of the capabilities (eg,
If the starting load capacity is twice that of normal operation, 50% of the capacity)
Will be running at.

[0006]

As described above, in the conventional system, since the capacity of the regular machine is determined according to the starting capacity of the load, there is a difference from the operating capacity during normal operation, and the operating rate decreases. At the same time, the external shape and cost increase, and the capital investment efficiency decreases, which is uneconomical.

In view of the above-mentioned problems, an object of the present invention is to use a backup machine already existing in the system to compensate for the difference between the starting capacity and the normal operating capacity when the load is started, and Match the capacity to the normal operating capacity,
It is an object of the present invention to provide a power supply device which has a smaller capacity at the time of startup than that of the conventional method and which is more economical.

[0008]

In order to achieve the above object, the present invention has n power supply devices for supplying power to a plurality of loads, and when any one of the power supply devices fails. , In a power supply device having one backup power supply device so that power can be supplied to the load group shared by the power supply device instead of the power supply device, each load is started up more than in normal operation. When it has a starting characteristic that requires a large amount of power, it divides the load group belonging to the first power supply unit, one load group is started by the first power supply unit, and the other load group is backed up. After the power supply for power supply is started up and the start-up is completed, the divided load groups are commonly connected again and the first power supply device is normally operated. Then, the above is applied to the load group belonging to the second power supply device. Similarly, the second power supply and back Tsu activated by up power supply device is provided with means for repeated division started until the n-th.

[0009]

When the load is started by the above means, first, the load group belonging to the first power supply unit is divided into two, and the backup machine supplements half of the load start-up capacity to start the load. After that, when the activation of the load group belonging to the first power supply device is completed, the two divided load groups are connected again in common and brought into the normal operation state by the first power supply device. Second
The loads belonging to the power supply devices of the second and subsequent power supplies are sequentially started in the same manner, and the load is divided and started, so that the regular machine can be suppressed to the minimum capacity corresponding to the normal operation.

[0010]

FIG. 1 shows the configuration of one embodiment of the present invention. Figure 1
In, the normal machines 1 to 3, the backup machine 4, the loads 5 to 16 of the electric motor, the normal machine loading contactors 17 to 19, the backup machine loading contactors 20 to 22, the backup machine loading contactors 23 to 25 at startup, The load group division contactors 26 to 28, and the operation control device 29. Next, the startup sequence according to this embodiment will be described with reference to the time chart shown in FIG. In Fig. 1, in the initial state of this system, the contactors 17 to 25 are OFF, and the contactors are
26 to 28 are ON. When the motor is started, the operation control device 29 first outputs an "operation" signal to the regular machine 1, the regular machine 2, the regular machine 3 and the backup machine 4. The regular machine 1, the regular machine 2, and the regular machine 3 that have received this "running" signal
And the backup machine 4 sets the output required for starting the motor.

Next, a "start" signal is output from the operation control device 29 to the regular machine 1, and the regular machine 1 receiving this signal turns off the contactor 26, and thereafter turns on the contactors 17 and 23.
When turned on, the motor group corresponding to the regular machine 1 is started. When the start-up is completed, the commercial machine 1 turns off the contactor 23 and then turns on the contactor 26 to bring it into a normal operation state. Here, the service machine 1 outputs a "startup complete" signal to the operation control device 29, and the operation control device 29 which receives this "startup completion" signal outputs a "startup" signal to the next service machine 2. The normal machine 2 repeats the same operation as in the case of the common machine 1 and the similar operation is repeated in the case of the common machine 3 in sequence, whereby the respective motor groups are divided and activated. According to this embodiment, the following effects can be obtained. 1. You can determine the capacity of the regular machine according to the normal operating capacity,
Cost reduction and miniaturization can be achieved. 2. By using the existing backup machine, it is possible to perform the split start-up without adding a new power supply device to supplement the capacity at the time of starting the motor.

[0012]

According to the present invention, even when a load that requires electric power larger than the normal operating capacity is started at the time of startup, the capacity of the commercial machine is not increased, and a new device can be installed even during split startup. It is possible to provide a more economical power supply device without adding.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a time chart for explaining the operation of the above embodiment.

FIG. 3 is a block diagram of a conventional device.

[Explanation of symbols]

 1 to 3 ... Power supply for regular use 4 ... Power supply for backup 5 to 16 ... Load of electric motor 17 to 19 ... Switch to turn on regular machine 20 to 22 ... Switch to turn on backup machine 23 to 25 ... Turn on backup machine at startup Switches 26-28 ... Load group division switch 29 ... Operation control device

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kuniyuki Araki 1-1-1 Shibaura, Minato-ku, Tokyo Inside Toshiba Headquarters Office

Claims (1)

[Claims] 1. When there are n power supply devices for supplying electric power to a plurality of loads, and any one of the power supply devices fails, the load group shared by the power supply devices is In a power supply device provided with one backup power supply device so that power can be supplied instead of the power supply device, when each load has a start-up characteristic that requires a larger amount of power at start-up than during normal operation, The load group belonging to the first power supply unit is divided, one load group is activated by the first power supply unit, the other load group is activated by the backup power supply unit, and after the activation is completed, the divided load group is divided. The common connection is made again and normal operation is performed with the first power supply device, and then the second power supply device and the backup power supply device are also started for the load group belonging to the second power supply device. And start divided up to the nth A power supply device characterized by repeating.