JP2000261984A - Uninterruptive power unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an uninterruptive power unit by which a faulty converter can be maintained, without lowering the cooling capacity during power supply and also the opening and closing of a circuit during power supply can be performed safely and easily. SOLUTION: This power unit is provided with a lid 41 which blocks a ventilation path inside an air duct 12, and a pin 49 and a guide pin 48 are fixed to the lid 41. The lid 41 moves vertically along the guide hole 50 provided in the air duct 12 and opens and closes a ventilation port 42. A slide plate 47 outside the air duct 12 is attached to the rail 44 for mounting and removing of a power converter freely moving the in the forward and backward direction via a guide hole 45. The guide pin 48 pieces the slant guide hole 52 in the slide plate 47 and converts the motion of the lid 41 into vertical motion by the forward and backward motion of the slide plate 47, and opens the ventilation port 42 of the air duct 12. The connector 26 of a power converter 20 engages with a copper bus bar and is electrically connected with an external circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an uninterruptible power supply.

[0002]

2. Description of the Related Art FIG. 7 is a perspective view of a conventional uninterruptible power supply having a partially broken surface. In the figure, each power conversion device 78 is disposed in the left-right direction on the upper part of the housing 76, and a panel component 77 is mounted below the power conversion device 78. Each power conversion device 78 has a built-in semiconductor switch for DC / AC conversion or DC / AC conversion. The semiconductor switch generates heat during operation, and if the amount of generated heat increases, the semiconductor switch itself may be destroyed. Therefore, the semiconductor switch is mounted on the cooling fin. A ventilation fan 79 for forced air cooling is mounted above the cooling fins.

An AC terminal and a DC terminal of a bridge circuit using the semiconductor switch are provided as electrical connection terminals 73 on the front side of the uninterruptible power supply 70 in consideration of front maintenance. The entire forced-air cooling ventilation path of the uninterruptible power supply 70 takes in cooling air from the ventilation hole 75 at the lower front of the front door 74 to cool the panel components 77 and collectively ventilate the cooling fan through the cooling fins of the power converter 78. 79
Is exhausted to the upper surface of the housing 76. A ceiling plate 71 is provided on the upper surface of the housing 76, and a ventilation hole 72 for exhausting air is provided in the ceiling plate 71.

[0004]

However, in the conventional uninterruptible power supply 70, the forward converter for AC / DC conversion or the reverse converter for DC / AC conversion fails, and the alternate AC / DC converter fails.
In a state where the circuit is switched by a selection switch to a forward or reverse converter capable of DC or DC / AC conversion and power is continuously supplied to the load, any of the failed power converters 78 is maintained or repaired for the purpose of maintenance. Case 76
In order to take it out, it is necessary to separate a wiring material, such as an electric wire, from the electrical connection terminal 73 of the power conversion device 78 with a tool or the like, but this involves a very dangerous operation during power supply. Further, if the power converter 78 is taken out of the housing 76, the ventilation hole 72 for exhausting the ceiling plate 71 is opened, and the ventilation fan 79 of the remaining normal power converter 78 causes the ventilation hole 79 to open. 72
This causes a problem that the normal cooling function of the uninterruptible power supply 70 performing forced air cooling cannot be maintained.

[0005] The present invention has been made in view of such a point, and in the case of maintenance or the like of a power conversion device 78 that has failed during power supply, the uninterruptible power supply 70 In order to maintain the cooling performance of
A plate that can be automatically opened and closed in conjunction with the attachment / detachment of the power converter 78 is provided in a part of the cooling ventilation path of the power converter 78 that performs forced air cooling, and the power converter 78
The electric connection terminal 73 is equipped with a wiring device such as a connector that can be connected with one touch without using a tool or the like, so that the circuit can be opened and closed safely and easily, and the cooling performance is reduced during power supply. It is an object of the present invention to provide an uninterruptible power supply device that can maintain a failed power conversion device 78 without causing it to operate, and at the same time, can safely and easily open and close a circuit during power supply.

[0006]

According to the present invention, a plate capable of automatically opening and closing a ventilation hole in accordance with attachment / detachment of the power converter is provided at one location of a ventilation path by forced air cooling of each power converter. Thereby, even if the power converter is taken out of the housing for maintenance or the like during power supply, the cooling performance is not reduced. At the same time, by changing the wiring method of tightening electric wires etc. with screws to the electrical connection terminals of the power conversion device to the connection method by inserting and removing connectors etc., it is possible to automatically open and close the circuit as the power conversion device is attached and detached Become.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to solve the above-mentioned problems, an uninterruptible power supply according to the present invention has three or more power converters 20 constituted by a bridge circuit using a semiconductor switch 27. The conversion devices 20 are forward conversion devices 2 from AC to DC, and at least one conversion device 20 is a reverse conversion device 3 from DC to AC, and at least one of the conversion devices 20 is A forward / inverse conversion device 4 that is selectively operated to perform either the forward conversion from AC to DC or the inverse conversion from DC to AC.
Is connected to an AC power supply 61 via a selection switch 8, the AC terminal of the inverter 3 is connected to the load RL via the selection switch 8, and the AC terminal of the inverter 4 is connected via the selection switch 8. Connected to the load RL via another selection switch 8 and all the DC terminals of the power converter 20 are connected to the open / close switch 7 respectively.
And a cooling device that is connected to the storage battery 62 via the power supply device and collectively cools the power conversion devices 20. The cooling device separates one of the power conversion devices 20 and supplies power during maintenance or repair. The feature is that a mechanism for automatically maintaining the cooling of the power conversion device 20 is provided.

The uninterruptible power supply according to the present invention has a bridge circuit using a semiconductor switch 27, a smoothing capacitor 23 connected to a DC terminal, and a circuit switching function at the AC terminal and the DC terminal of the bridge circuit. It is characterized by having a detachable mechanism.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of an uninterruptible power supply according to one embodiment of the present invention, which has a partially broken surface. In the uninterruptible power supply 1, the power converters are arranged vertically.
The upper stage is a forward / reverse converter 4 capable of AC / DC conversion or DC / AC conversion, the middle stage is a forward converter 2 for AC / DC conversion, and the lower stage is an inverse converter 3 for DC / AC conversion. A selection switch 8 and an open / close switch 7 connected to a DC terminal and an AC terminal of the power conversion device are arranged on the left side of each power conversion device, that is, the forward / reverse conversion device 4, the forward conversion device 2, and the reverse conversion device 3, Another panel component 5 is mounted on the lower part of the housing 6. A wind tunnel 12 is provided at the rear of each power conversion device. Ventilation holes are opened in the wind tunnel 12 so as to match ventilation holes on the back of each power conversion device. A ventilation fan 11 is arranged above the wind tunnel 12. The flow of the wind by forced air cooling is taken in through a ventilation hole 10 at the lower front of the front door 9, passes through each power converter, and is exhausted to the upper surface of the housing 6 by the collective ventilation fan 11 through the wind tunnel 12.

FIG. 2 is a schematic diagram of a power converter of an uninterruptible power supply according to one embodiment of the present invention. (A) is a front view, (b) is a side view, and (c) is a rear view. The power converter 20 is formed in a box with a front plate 22, a cover 28, and a base plate 24. In the box, a semiconductor switch 27 forms a bridge circuit and is mounted on the cooling fin 25. One end face of the cooling fin 25 coincides with the cover rear face 29, and one end face faces the front face and is fixed to the base plate 24.
The same ventilation holes 30 as the five sections are opened. The smoothing capacitor 23 at the DC end is mounted between the front plate 22 and the cooling fin 25. The DC terminal and the AC terminal of the bridge circuit are connected to a connector 26 mounted on the lower rear side of the base plate 24 by an electric wire or the like. The flow of the air in the forced air cooling is sucked in from the ventilation holes 21 of the front plate 22, removes the heat of the semiconductor switch 27 through the cooling fins 25, and then exhausted from the ventilation holes 30 on the back surface 29 of the cover.

FIG. 3 is a ventilation path diagram by forced air cooling of the uninterruptible power supply according to one embodiment of the present invention. The ventilation path of each power converter 20 in forced air cooling is shown.
The flow of the air in the forced air cooling is taken in from the ventilation holes on the front plate of each power converter 20, takes heat of the semiconductor switch through the cooling fins, and is exhausted to the wind tunnel 12 from the ventilation holes on the back surface 29 of the cover. The flow of the wind exhausted to the wind tunnel 12 rises in the wind tunnel 12 and exhausts outside the uninterruptible power supply. The ventilation fan 11 enhances the flow of these winds and efficiently cools the semiconductor switches.

FIG. 4 is a partially enlarged detailed view of the vicinity of the wind tunnel of the uninterruptible power supply according to one embodiment of the present invention. The opening / closing mechanism of the ventilation path of the power converter in forced air cooling and the electrical connection with the external circuit will be described. A cover 41 that closes the ventilation path is provided inside the ventilation hole of the wind tunnel 12.
A pin 49 and a guide pin 48 are fixed to the lid 41, and these pins are connected to the guide holes 5 provided in the wind tunnel 12.
It is constrained to move up and down along zero. That is, when the lid 41 moves upward, the ventilation holes 42 are opened, and when the lid 41 moves downward, the ventilation holes 42 are closed.

Further, a slide plate 47 is provided outside the wind tunnel 12.
Is provided, and the slide plate 47 is provided with the power conversion device 20.
A bush 46 is mounted on a rail 44 provided on the housing side to attach and detach the power converter via a guide hole 45 so as to be movable in the front-rear direction, and is restricted by the movement in the same direction as the attaching and detaching direction of the power converter 20. ing. That is, the slide plate 47 moves rearward at the same time as the insertion of the power converter 20, and moves forward when the slide plate 47 is pulled out. The guide pin 48 fixed to the lid 41 is provided with the inclined guide hole 5 of the slide plate 47.
2, the front and rear movement of the slide plate 47 is converted into a vertical movement of the lid 41 via the inclined guide hole 52, and a mechanism capable of opening and closing the ventilation hole 42 of the wind tunnel 12 is provided. When the power converter 20 is mounted on the housing, the connector 26 fixed to the power converter 20 (see FIG. 2)
Is fitted with the copper bus bar 43 provided on the housing side, and is electrically connected to an external circuit.

FIG. 5 is a circuit diagram of a power converter of an uninterruptible power supply according to one embodiment of the present invention. In the figure, six semiconductor switches SW are denoted by S1 to S6, respectively. A bridge circuit of AC terminals c1 and c2 can be formed by using S1-S3, a bridge circuit of AC terminals c2 and c3 can be formed by using S4-S5, and a bridge circuit of AC terminals c1 and c3 can be formed by using S2-S6. A smoothing capacitor C is connected between the DC terminals a and b.

FIG. 6 is a circuit diagram of an uninterruptible power supply according to one embodiment of the present invention. The AC terminal of the forward converter 2 for AC / DC conversion is connected to an AC power source 6 through a selection switch 8.
1, the DC terminal is connected to a storage battery 62 via an open / close switch 7. The AC terminal of the forward / inverting converter 4 capable of AC / DC conversion or DC / AC conversion is selectively connected to an AC power supply 61 or a load RL by a selection switch 8, and the DC terminal is connected to a storage battery 62 via an on / off switch 7. ing. The AC terminal of the inverter 3 for DC / AC conversion is connected to the load RL via the selection switch 8 and the DC terminal is
Is connected to the storage battery 62 via the.

[0016]

As described above, in the uninterruptible power supply according to the present invention, when one of the power converters is separated for maintenance or repair, cooling for cooling the power converters collectively is performed. A mechanism that automatically maintains the cooling of the power converter during power supply by the device, that is, equipped with a lid that can be automatically opened and closed according to the attachment and detachment of the power converter in the ventilation path by forced air cooling, Since the connector is used for the electrical connection terminal to the circuit, the failed power converter can be safely and easily maintained during power supply without lowering the cooling performance.

[Brief description of the drawings]

FIG. 1 is a perspective view of an uninterruptible power supply according to an embodiment of the present invention, which has a partially broken surface.

FIGS. 2A and 2B are schematic diagrams of a power converter of an uninterruptible power supply according to an embodiment of the present invention, wherein FIG. 2A is a front view, FIG. 2B is a side view, and FIG.

FIG. 3 is a diagram of a ventilation path by forced air cooling of the uninterruptible power supply according to one embodiment of the present invention.

FIG. 4 is a partially enlarged detailed view of the vicinity of a wind tunnel of the uninterruptible power supply according to one embodiment of the present invention.

FIG. 5 is a circuit diagram of a power converter of the uninterruptible power supply according to one embodiment of the present invention.

FIG. 6 is a circuit diagram of an uninterruptible power supply according to one embodiment of the present invention.

FIG. 7 is a perspective view of a conventional uninterruptible power supply having a partially broken surface.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Uninterruptible power supply 2 Forward conversion device 3 Reverse conversion device 4 Forward / reverse conversion device 5 Panel parts 6 Case 7 Opening / closing switch 8 Selection switch 9 Front door 10 Ventilation hole 11 Ventilation fan 12 Wind tunnel 20 Power conversion device 21 Ventilation hole 22 Front plate Reference Signs List 23 smoothing capacitor 24 base plate 25 cooling fin 26 connector 27 semiconductor switch 28 cover 29 cover back surface 30 ventilation hole 41 lid 42 ventilation hole 43 copper bus bar 44 rail 45 guide hole 46 bush 47 slide plate 48 guide pin 49 pin 50 guide hole 52 guide Hole 61 AC power supply 62 Storage battery 70 Uninterruptible power supply device 71 Ceiling plate 72 Ventilation hole 73 Electrical connection terminal 74 Front door 75 Ventilation hole 76 Housing 77 Board parts 78 Power conversion device 79 Ventilation fan a, b DC terminal c1, c2 c3 AC terminal SW Semiconductor Switch S1-S6 Semiconductor switch C Smoothing capacitor

Claims (2)

[Claims] 1. A power conversion device comprising at least three power conversion devices constituted by a bridge circuit using a semiconductor switch, wherein at least one of the power conversion devices has a forward conversion from AC to DC. Device (2), of which at least one converter (20) is a DC-to-AC converter (3), of which at least one converter (2)
0) is a forward / inverting conversion device (4) that can be selectively operated for both forward conversion from AC to DC and reverse conversion from DC to AC, and the AC terminal of the forward conversion device (2) is a selection switch. The AC terminal of the inverter (3) is connected to the load (RL) via the selection switch (8), and the AC terminal of the inverter (3) is connected to the AC power supply (61) via the switch (8). Is connected to an AC power supply (61) via a selection switch (8) and to a load (RL) via another selection switch (8), and all DC terminals of the power converter (20) are A cooling device that is connected to the storage battery (62) via the open / close switch (7) and collectively cools the power conversion devices (20); and the cooling device separates one of the power conversion devices (20). Power conversion device (
An uninterruptible power supply comprising a mechanism for automatically maintaining the cooling of 0). 2. A bridge circuit using a semiconductor switch (27), and a smoothing capacitor (23) connected to a DC terminal.
2. The uninterruptible power supply according to claim 1, further comprising an attachment / detachment mechanism having a circuit opening / closing function at an AC terminal and a DC terminal of the bridge circuit.