JPH0629351U - Switching device for AC uninterruptible power supply - Google Patents

Abstract

(57) [Summary] [Purpose] In a switching device for an AC power supply device used in an AC uninterruptible power supply system having two or more AC uninterruptible power supplies, even if the load is a computer, etc., power is supplied without shutting down the system. An object of the present invention is to provide a switching device for an AC power supply device that can be continued. [Composition] A commercial power supply or an AC uninterruptible power supply 3 or 4 that supplies uninterruptible power with an inverter power supply system at all times, and if there is no power supply from one system to another system, Alternating current changeover switch 9,1
In an AC power supply system having 0, an AC uninterruptible power supply characterized by turning on the AC changeover switch of another system after the AC changeover switch of the system supplying the electric power is in a predetermined phase after being turned OFF. Device switching device.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an AC uninterruptible power supply system, and more specifically, it is composed of an AC uninterruptible power supply unit that supplies uninterruptible power by two or more systems of commercial power supplies or a constant inverter power supply system. Switching device of AC uninterruptible power supply used for standby redundancy system that can switch to power supply from AC uninterruptible power supply of other system without interruption when power supply becomes impossible due to equipment failure It is a thing.

[0002]

[Prior art and its problems]

 A conventional embodiment will be described with reference to the drawings. FIG. 5 shows the configuration of this type of AC power supply device. 1 and 2 are commercial power sources, 3 and 4 are AC uninterruptible power sources, 5 is a changeover control circuit, 6 is a changeover switch, and 7 is a load.

Conventionally, an electromagnetic contactor is used for the changeover switch 6 as shown in FIG. 5, so that the time (t ₁ −t ₀₎ for switching from the AC uninterruptible power supply 3 to the AC uninterruptible power supply 4 as shown in FIG. ) Usually takes over 100 msec. Therefore, if the load is a computer, etc., it may lead to system down.

The present invention has been made to solve the above-mentioned drawbacks, and an object thereof is to provide a switching device for an AC power supply device that can continue power supply without shutting down the system even when the load is a computer or the like. To do.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is provided with two or more power supplies such as an AC uninterruptible power supply for supplying uninterruptible power, and an AC changeover switch for switching to another system when power cannot be supplied from one system. In the switching device of the alternating current power supply device used in the provided alternating current power supply system, a thyristor element is used for the changeover switch of the alternating current uninterruptible power supply, and the thyristor element is controlled with a certain specified phase difference. .

[0006]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of an AC power supply device using the switching device of the present invention. 1 and 2 are commercial power supplies, 3 and 4 are AC uninterruptible power supplies, 8 is a switching control circuit, 9 and 10 are changeover switches, and 7 is a load.

In the present invention, since thyristor elements are used for the changeover switches 9 and 10 as shown in FIG. 1, the time (t) for switching from the AC uninterruptible power supply 3 to the AC uninterruptible power supply 4 as shown in FIG. _3- t ₂ ) takes only a few msec. Therefore, even if the load is a computer, the system will not go down.

Further, in the present invention, the OFF-ON timing of the changeover switch is set as shown in FIG. 3 in order to prevent cross current between the AC uninterruptible power supplies. The changeover switch uses the thyristor element as described above, but since the thyristor element is a natural commutation type, the changeover source switch is turned off (t ₄ ) and the changeover destination switch is turned on (t ₄ ). ₅ ) It is controlled as follows.

For example, in the case of a load with a power factor of 1.0 to 0.7 (delay), the delay of the load current phase is MAX 46 °, so if the ON timing is 46 ° or later, the thyristor element will spontaneously extinguish. There is no cross current because it exists.

The configuration of the switching control circuit for controlling this is shown in FIG. 3 and 4 are AC uninterruptible power supplies, 8 is a switching control circuit, 9 and 10 are changeover switches, 11 and 12 are AC zero-cross detection circuits, 13 and 14 are OFF timing detection circuits, 15 is a switching flip-flop circuit, and 16 are Reference numeral 17 is an ON timing delay circuit.

When the AC uninterruptible power supply 3 fails and power cannot be supplied, the switching switch 9 is turned off as shown in FIG. 3 (time t ₄ ). Further, this OFF signal passes through the switching flip-flop circuit 15 and is delayed by the ON timing delay circuit 17 for a prescribed time (generally about 5 msec), and then an ON signal is sent to the changeover switch 10 (time t ₅ ) AC Start supplying power from uninterruptible power supply 4 to the load. Further, since the switching flip-flop circuit 15 sends the ON signal to either the switching switch 9 or 10, even if the switching control circuit 8 malfunctions, power can be supplied to the load from either the AC uninterruptible power supply 3 or 4. Is.

[0012]

[Effect of device]

 As described above, the present invention is an AC uninterruptible system used for a standby redundant system that can switch to power supply from another system when power supply from one system becomes impossible in two or more power sources. If applied to a power supply unit, switching can be performed without interruption, so power can be supplied without shutting down the system even when the load is a computer or the like.

[Brief description of drawings]

FIG. 1 is a block diagram of a switching system using a switching device of an AC power supply device of the present invention.

FIG. 2 is a waveform diagram of the voltage of each part of the AC power supply device using the switching device according to the present invention.

FIG. 3 is a waveform diagram showing OFF-ON timing of the switching device according to the present invention.

FIG. 4 is a block diagram showing a configuration of a switching control circuit according to the present invention.

FIG. 5 is a block diagram of a switching system using a switching device of a conventional AC power supply device.

FIG. 6 is a waveform diagram of voltages at various parts in the conventional switching system.

[Explanation of symbols]

 1, 2 Commercial power supply 3, 4 AC uninterruptible power supply 5 Switching control circuit (for electromagnetic contactor) 6 Electromagnetic contactor 7 Load 8 Switching control circuit (for thyristor element) 9, 10 Changeover switch 11, 12 AC zero-cross detection circuit 13, 14 OFF timing detection circuit 15 Switching flip-flop circuit 16, 17 ON timing delay circuit

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Yoshinori Harima 2-6 Yoyogi, Chiyoda-ku, Tokyo Within East Japan Railway Company (72) Futoshi Yamamoto 6-6 Josaimachi, Takatsuki-shi, Osaka Yuasa Battery stock company

Claims (1)

[Scope of utility model registration request] 1. A power supply having two or more systems, such as a commercial power supply or an AC uninterruptible power supply that supplies uninterruptible power by a constant inverter power supply system, and switches to another system when power supply from one system becomes impossible. In an AC power supply system equipped with an AC switching switch, the AC switching switch of the other system is turned ON after the AC switching switch of the system supplying the electric power has reached a certain specified phase after being turned OFF. Switching device for power failure power supply.