JPH1198716A - Uninterruptible power supply unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress common-mode noises by means of only one magnetic material, by so providing a magnetic circuit common to the connection paths of an uninterruptible power supply unit with its AC power supply and its load as to insert the magnetic circuit into the connection paths. SOLUTION: In addition to a rectifier 12, a battery 13, and an inverter 14, an uninterruptible power supply unit 20 has a common-mode choke 21 comprising windings 21a, 21b and such a magnetic material 21c common to the windings 21a, 21b as a ferrite core. Further, connecting an AC power supply 1 and a load 2 with the interruptible power supply unit 20 via the windings 21a, 21b, the polarities as shown in the figure are given respectively to the windings 21a, 21b to suppress common-mode noises generated in the uninterruptible power supply unit 20 between it and the earth from leaking to the external. As a result, the common-mode noises accompanied by the switching operations of the uninterruptible power supply unit 20 can be suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an uninterruptible power supply, and more particularly to a circuit for suppressing common mode noise generated from the uninterruptible power supply.

[0002]

2. Description of the Related Art FIG. 5 is a circuit diagram showing a conventional example of this type of uninterruptible power supply. 5, reference numeral 1 denotes an AC power supply such as a commercial power supply, 10 denotes an uninterruptible power supply, and 2 denotes a load of the uninterruptible power supply 10. The uninterruptible power supply 10 has a common mode choke 11, a rectifier 12, for example, a bridge connection of a diode, a storage battery 13, and an inverse conversion, for example, a bridge connection of a semiconductor switch composed of an anti-parallel circuit of a transistor and a diode. And a common mode choke 15. When the AC power supply 1 is healthy, the AC input from the AC power supply 1 is supplied to the rectifier 12.
, And the DC is converted into an AC having a desired frequency and voltage by an inverter 14 and supplied to the load 2.
When a power failure occurs, the inverter 1
By supplying DC power to the load 4, the load 2 functions as an uninterruptible power supply according to a known technique.

[0003]

In the conventional uninterruptible power supply device 10 shown in FIG. 5, common mode noise generated between the rectifier 12 and the inverter 14 between the ground and the ground due to the switching operation of the rectifier 12 and the inverter 14 is generated by the AC power supply. Common mode chokes 11 and 15 are provided to suppress adverse effects on a device (not shown) connected to 1 and a device as a load 2.

In recent years, high-speed operation of transistors, diodes, and the like constituting the rectifier and the inverter has become possible.
As a result, it has become possible to increase the switching frequency of the element and make the uninterruptible power supply more compact. However, when the switching frequency is set to a high frequency, the common mode noise is also set to a higher frequency. As a result, the common mode choke that suppresses the common mode noise also requires high frequency characteristics, and the magnetic material of the common mode choke is expensive. Have become necessary.

[0005] An object of the present invention is to solve the above-mentioned problems, and
It is an object of the present invention to provide an uninterruptible power supply device that can suppress the common mode noise using a single magnetic material.

[0006]

According to the first aspect of the present invention, when the AC power supply is sound, the AC input from the AC power supply is converted into DC by a rectifier composed of a semiconductor switch, and the DC is composed of a semiconductor switch. An uninterruptible power supply that converts an AC of a desired frequency and voltage into an AC with a desired inverter and feeds the load to the load, and supplies DC power to the inverter from a storage battery installed therein when the AC power is out of power. A common magnetic circuit is inserted into a connection path from the AC power supply to the uninterruptible power supply and a connection path from the uninterruptible power supply to the load.

In a second aspect of the present invention, when the AC power supply is sound, the AC input from the AC power supply is converted into DC by a rectifier comprising a semiconductor switch, and the DC is converted by a reverse converter comprising a semiconductor switch. An uninterruptible power supply that converts a desired frequency and voltage into an alternating current and supplies power to a load, and supplies a direct current to the inverter from a storage battery provided outside when the alternating current power is interrupted. A common magnetic circuit is inserted into each connection path to the uninterruptible power supply and the connection path from the uninterruptible power supply to the load.

According to a third aspect of the present invention, when the AC power supply is sound, the AC input from the AC power supply is converted into DC by a rectifier composed of a semiconductor switch, and the DC is converted by a reverse converter composed of a semiconductor switch. The AC power of a desired frequency and voltage is converted and supplied to the load, and when the rectifier or the inverter fails, the AC power is supplied directly to the load. In an uninterruptible power supply that supplies DC power to a converter, a common magnetic circuit is inserted into each connection path from the AC power supply to the uninterruptible power supply and the connection path from the uninterruptible power supply to the load. Set up.

In a fourth aspect of the present invention, when the AC power supply is sound, the AC input from the AC power supply is converted into DC by a rectifier comprising a semiconductor switch, and the DC is converted by a reverse converter comprising a semiconductor switch. The AC power of a desired frequency and voltage is converted and supplied to the load, and when the rectifier or the inverter fails, the AC power is supplied directly to the load. In the uninterruptible power supply for supplying DC power to the converter, a common magnetic circuit for a connection path from the AC power supply and the storage battery to the uninterruptible power supply, and a connection path from the uninterruptible power supply to the load. Insert.

According to the present invention, by providing a magnetic circuit of one magnetic material in common for a plurality of connection paths from the uninterruptible power supply to the outside, which are caused by differences in devices constituting the uninterruptible power supply, The common mode noise can be suppressed.

[0011]

FIG. 1 is a circuit diagram of an uninterruptible power supply according to a first embodiment of the present invention, in which components having the same functions as those of the conventional circuit shown in FIG. Is attached. The uninterruptible power supply 20 shown in FIG. 1 includes a common mode choke 21 in addition to the rectifier 12, the storage battery 13, and the inverter 14. The common mode choke 21 includes a winding 21a, a winding 21b, and windings 21a and 21b.
b, for example, a magnetic material 2 such as a ferrite core.
1c.

That is, in FIG. 1, the uninterruptible power supply 2
0, the AC power supply 1 is connected via the winding 21a, the uninterruptible power supply 20 is connected to the load 2 via the winding 21b, and the windings 21a and 21b are made to have the polarities as shown in the drawing. It is apparent from the known technology that the common mode choke 21 can suppress the leakage of the common mode noise generated between the ground and the inside of the uninterruptible power supply 20 to the outside.

FIG. 2 is a circuit diagram of an uninterruptible power supply according to a second embodiment of the present invention, in which components having the same functions as those of the conventional circuit shown in FIG. I have. The uninterruptible power supply 30 shown in FIG.
A common mode choke 31 is provided in addition to the inverter 14. This common mode choke 31 has a winding 31a.
, Winding 31b, winding 31c, windings 31a to 31c
For example, a magnetic material 31 such as a ferrite core
d.

In the uninterruptible power supply 30, the AC power supply 1
When the power is healthy, the AC input from AC power supply 1
2, the direct current is converted into an alternating current having a desired frequency and voltage by an inverter 14, and is supplied to the load 2. When the AC power supply 1 is out of power, the inverter 3 Supplies the load 2 with the function of an uninterruptible power supply according to a known technique.

That is, in FIG. 2, the uninterruptible power supply 3
0, the AC power supply 1 is connected via the winding 31a, the uninterruptible power supply 30 is connected to the storage battery 3 via the winding 31b, and the uninterruptible power supply 30 is connected to the load 2 via the winding 31c. , The winding 31a, the winding 31b, and the winding 31c have polarities as shown in FIG.
It is clear from the well-known technique that the common mode choke 31 can suppress the leakage of the common mode noise generated between the ground and the ground to the outside.

FIG. 3 is a circuit diagram of an uninterruptible power supply according to a third embodiment of the present invention. Components having the same functions as those of the conventional circuit shown in FIG. I have. The uninterruptible power supply 40 shown in FIG.
A changeover switch 41 and a common mode choke 42 are provided in addition to the storage battery 13 and the inverter 14. The common mode choke 42 includes a winding 42a, a winding 42b, a winding 42c, and a magnetic material 42d such as a ferrite core, which is commonly used for the windings 42a to 42c.

In the uninterruptible power supply 40, the AC power supply 1
When the power is healthy, the AC input from AC power supply 1
2, the direct current is converted into an alternating current having a desired frequency and voltage by an inverter 14, and is fed to the load 2, and the rectifier 1
When the inverter 2 or the inverter 14 is out of order, this is detected by a circuit (not shown), and the changeover switch 41 is switched to the AC power supply 1 to supply power directly from the AC power supply 1 to the load 2. By supplying DC power from the installed storage battery 13 to the inverter 14, the load 2
Has a function of an uninterruptible power supply by a known technique.

That is, in FIG. 3, the uninterruptible power supply 4
0 is connected to the AC power supply 1 via the windings 42a and 42b, and the uninterruptible power supply 40 is connected to the load 2 via the winding 42c.
Are connected, and the windings 42a, 42b, and 42c are set to have the polarities as shown in FIG.
It is apparent from the known technique that the common mode choke 42 can suppress the leakage of the common mode noise generated between the ground and the inside to the outside.

FIG. 4 is a circuit diagram of an uninterruptible power supply according to a fourth embodiment of the present invention. Components having the same functions as those of the conventional circuit shown in FIG. I have. The uninterruptible power supply 50 shown in FIG.
In addition to the inverter 14, a changeover switch 51 and a common mode choke 52 are provided. The common mode choke 52 includes a winding 52a, a winding 52b, a winding 52c,
Common to the winding 52d and the windings 52a to 52d, for example,
And a magnetic material 52e such as a ferrite core.

In the uninterruptible power supply 50, the AC power supply 1
When the power is healthy, the AC input from AC power supply 1
2, the direct current is converted into an alternating current having a desired frequency and voltage by an inverter 14, and is fed to the load 2, and the rectifier 1
When the inverter 2 or the inverter 14 is out of order, this is detected by a circuit (not shown), and the changeover switch 51 is switched to the AC power supply 1 side to feed power directly from the AC power supply 1 to the load 2. By supplying DC power to the inverter 14 from the installed storage battery 3, the load 2
Has a function of an uninterruptible power supply by a known technique.

That is, in FIG. 4, the uninterruptible power supply 5
0, the AC power supply 1 is connected via the windings 52a and 52b, the uninterruptible power supply 50 is connected to the storage battery 3 via the winding 52c, and the uninterruptible power supply 50 is connected to the load 2 via the winding 52d. By connecting the windings 52a, 52b, 52c, and 52d to polarities as shown in the drawing, common mode noise generated between the ground in the uninterruptible power supply 50 leaks out. It is clear from the well-known technique that this can be suppressed by the common mode choke 52.

The embodiment of the present invention can also be applied to an uninterruptible power supply in which the uninterruptible power supply includes a plurality of sets of rectifiers and inverters, and these are configured in a parallel redundant configuration.

[0023]

According to the present invention, a magnetic circuit made of one magnetic material is provided in common for a plurality of connection paths from the uninterruptible power supply to the outside, which are caused by differences in equipment constituting the uninterruptible power supply. Thereby, the common mode noise can be suppressed. In particular, in a small-capacity uninterruptible power supply provided to a power supply of a personal computer or the like, a connection terminal to the outside in the uninterruptible power supply is arranged close to the uninterruptible power supply, so that a common mode choke using the magnetic material in common is used. Easy to install.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram of an uninterruptible power supply according to a first embodiment of the present invention;

FIG. 2 is a circuit diagram of an uninterruptible power supply according to a second embodiment of the present invention;

FIG. 3 is a circuit configuration diagram of an uninterruptible power supply according to a third embodiment of the present invention;

FIG. 4 is a circuit configuration diagram of an uninterruptible power supply according to a fourth embodiment of the present invention.

FIG. 5 is a circuit configuration diagram of an uninterruptible power supply showing a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... AC power supply, 2 ... Load, 3 ... Storage battery, 10 ... Uninterruptible power supply, 11 ... Common mode choke, 12 ... Rectifier,
DESCRIPTION OF SYMBOLS 13 ... Storage battery, 14 ... Inverter, 15 ... Common mode choke, 20 ... Uninterruptible power supply, 21 ... Uninterruptible power supply, 31 ... Common mode choke, 40 ... Uninterruptible power supply, 41 ... changeover switch,
42: common mode choke, 50: uninterruptible power supply,
51: changeover switch, 52: common mode choke.

Claims (4)

[Claims] When the AC power supply is sound, the AC input from the AC power supply is converted to DC by a rectifier comprising a semiconductor switch, and the DC is converted to a desired frequency and voltage by an inverter provided by a semiconductor switch. An uninterruptible power supply that converts the AC power to a load and supplies DC power to the inverter from a storage battery installed inside when the AC power is out of power. An uninterruptible power supply characterized in that a common magnetic circuit is inserted in a path and a connection path from the uninterruptible power supply to the load. 2. When the AC power supply is sound, the AC input from the AC power supply is converted into DC by a rectifier composed of a semiconductor switch, and the DC is converted to a desired frequency and voltage by an inverse converter composed of a semiconductor switch. In the uninterruptible power supply that converts the AC power to the load and feeds the load, and when the AC power supply is out of power, supplies DC power to the inverter from a storage battery provided outside, the uninterruptible power supply from the AC power supply and the storage battery Wherein a common magnetic circuit is inserted in each of the connection paths and the connection path from the uninterruptible power supply to the load. 3. When the AC power supply is sound, the AC input from the AC power supply is converted into DC by a rectifier comprising a semiconductor switch, and the DC is converted to a desired frequency and voltage by an inverter provided by a semiconductor switch. The AC power is supplied directly to the load when the rectifier or the inverter fails, and DC power is supplied from the storage battery installed inside to the inverter when the AC power fails. In the uninterruptible power supply for supplying, a common magnetic circuit is inserted in each connection path from the AC power supply to the uninterruptible power supply and a connection path from the uninterruptible power supply to the load. Uninterruptible power supply. 4. When the AC power supply is sound, the AC input from the AC power supply is converted into DC by a rectifier composed of a semiconductor switch, and the DC is converted to a desired frequency and voltage by an inverse converter composed of a semiconductor switch. The AC power is supplied directly to the load when the rectifier or the inverter fails, and when the AC power fails, the DC power is supplied to the inverter from a storage battery installed outside. In the uninterruptible power supply for supplying the, a common magnetic circuit is inserted in each connection path from the AC power supply and the storage battery to the uninterruptible power supply, and a connection path from the uninterruptible power supply to the load. Uninterruptible power supply characterized.