JP4344973B2 - Power converter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure of a power conversion device including a semiconductor element for power conversion and its accessory parts, a secondary battery, or a push button switch.
[0002]
[Prior art]
Computers and communication devices may malfunction if there are large fluctuations in the voltage or frequency of commercial power supplied to them. Also, even if the commercial power supply is in a very short time, if a power failure occurs, important data may be destroyed and normal operation may not be possible. Therefore, in preparation for such an unforeseen accident of the commercial power supply, an uninterruptible power supply device is frequently used as a power conversion device that can back up a power failure with a secondary battery and maintain a voltage and frequency at a constant value. Along with the downsizing of computers and the like, the uninterruptible power supply has also been reduced in capacity, and the semiconductor elements for power conversion used for this have been mounted on the printed board together with the control circuit from the conventional stack structure. It has become to.
[0003]
FIG. 6 is a structural diagram showing the internal structure of a conventional small-capacity uninterruptible power supply, in which FIG. 6 (a) is a front view thereof and FIG. 6 (b) is a right side view thereof. In many cases, this small capacity uninterruptible power supply is placed on the shelf below the rack where the equipment is installed.
The lower half of the small-capacity uninterruptible power supply device shown in FIG. 6 is a battery chamber 1. In this case, for example, a sealed lead-acid battery 2 is used as a secondary battery in preparation for a power failure of the commercial power supply. In 6, three are installed. The upper half of the small-capacity uninterruptible power supply is a power conversion device room 10 that houses various devices and circuits for power conversion. This power conversion device room 10 has a device mounting plate 11. A reactor 12 (three in FIG. 6) constituting a filter circuit is mounted on one surface of the device mounting plate 11, and a print is mounted on the other surface. A plate 13 is attached. A power conversion semiconductor element 14 is mounted on the printed board 13 together with a control circuit, and heat generated when the semiconductor element 14 operates is transferred to the heat radiation fin 15. The cooling air that flows in the direction of the arrow shown in the figure (from left to right in FIG. 6A) by operating the cooling fan 16 draws heat from the radiating fins 15 and discharges it outside the small-capacity uninterruptible power supply. Yes. In addition, the cooling air which the cooling fan 16 flows also flows into the reactor 12, and the heat generated from this is also released to the outside of the apparatus.
[0004]
Since the lead storage battery 2 installed in the battery chamber 1 is generally a sealed type, there is normally no risk of leakage of the internal electrolyte. However, if for some reason a crack occurs in the case of the lead storage battery 2 and the internal electrolyte leaks out, the electrolyte is corrosive, so it corrodes the surrounding equipment and is dangerous due to chemical reaction with the surrounding materials. Inconveniences such as generation of a new gas may occur. In order to prevent the leakage of the electrolyte from adversely affecting the surroundings, the lead storage battery 2 is housed in the battery chamber 1 in a state of being placed on the electrolyte receiver 3.
[0005]
FIG. 7 is a structural view showing a conventional example of a push button cover for protecting a push button switch attached to the surface of the uninterruptible power supply.
In order to start / stop the uninterruptible power supply and to set the operating value during operation, etc., the uninterruptible power supply is not shown, but a plurality of push button switches are installed in a place where the device can be operated easily. However, in order to facilitate the installation work and wiring work of this, and to reduce the installation space, the push button switch is mounted on the printed board together with the LED for display and other parts. Often it is attached to the surface of the device. However, the printed board and its mounting parts are exposed and unsightly as they are, and they may be damaged. In order to protect the parts and improve the appearance, the entire printed board is covered with the push button cover 22. At this time, in order to operate the push button switch via the push button cover 22, In FIG. 7, two windows 23 (shaded portions) are opened in the push button cover 22, and the pressure unit 24 is positioned in the window 23. The pressure unit 24 is configured to be coupled to the periphery of the window 23 through a thin coupling leg 25, and the pressure unit 24 and the coupling leg 25 together with the push button cover 22 are made of a synthetic resin (for example, acrylonitrile butadiene styrene resin). , Abbreviated as ABS resin). Reference numeral 27 denotes an LED display window.
[0006]
When the cross-sectional area of the coupling leg 25 is large, the amount of bending of the coupling leg 25 is small even when the pressing portion 24 is pressed with a strong force, and therefore the operation of the push button switch becomes difficult. Therefore, the push button switch can be operated by lightly pressing the pressure unit 24 with the fingertip, and the cross-sectional area of the coupling leg 25 is set so that the pressure unit 24 can return to its original position by its own elasticity when the fingertip is released. Must be reduced.
[0007]
[Problems to be solved by the invention]
As is apparent from the conventional example of FIG. 6 described above, the power conversion device room 10 is divided into two parts by the device mounting plate 11, so that the cooling air generated by the operation of the cooling fan 16 is also divided into two parts. Flowing into. Therefore, the semiconductor element 14 and the reactor 12 are cooled by separate air flows. Therefore, for example, if the heat generation amount of the semiconductor element 14 is larger than the heat generation amount of the reactor 12, the flow rate of the cooling air flowing to the semiconductor element 14 side is less than that flowing to the reactor 12 side. The element 14 is thermally destroyed and the uninterruptible power supply cannot be operated. In other words, the cooling air generated by the cooling fan 16 is provided with an extra facility such as a damper so that the heat generation amount of each of the semiconductor element 14 and the reactor 12 and the allowable temperature limit thereof can be appropriately distributed, and the flow rate can be distributed. There are drawbacks that must be adjusted to avoid inappropriateness. Therefore, if the capacity of the cooling fan 16 is increased so that a sufficient amount of cooling air can be obtained even if the flow rate is inappropriately distributed, the above-mentioned drawbacks can be avoided. In addition, there is a drawback that energy is wasted.
[0008]
In addition, when the conventional small capacity uninterruptible power supply shown in FIG. 6 is placed on a shelf, if the height to the upper end of the shelf is lower than the height of the small capacity uninterruptible power supply, it is installed in another location. However, this is inconvenient because it is far from the computer, and the electric wire laid between the computer and the computer becomes long. Therefore, even if the small-capacity uninterruptible power supply is tilted backward or forward, it is stored in a shelf and installed near the computer. At this time, the lead storage battery 2 has a different posture from the conventional one. If the electrolytic solution of the lead storage battery 2 leaks out in this posture, the electrolytic solution cannot be received by the electrolytic solution tray 3, and therefore, the corrosive electrolytic solution has a drawback of invading the surroundings.
[0009]
The push button cover 22 is integrally molded by pressurizing and injecting ABS resin into the mold, but if the resin injection port at this time is provided as inconspicuous as possible, for example, point A, injection is performed from here. There is no guarantee that the ABS resin will spread to the thin coupling legs 25. Therefore, when there is a portion having an extremely small cross-sectional area such as the coupling leg 25, a resin injection port is provided in this portion so that a defect does not occur because the resin flow is insufficient. In other words, the push button cover 22 is provided with a resin injection port for integral molding on the coupling leg 25, thereby avoiding molding defects due to poor resin flow.
[0010]
FIG. 8 is a partial structural view of a push button cover partially showing a conventional example in a state after integral molding when a resin injection port is provided on the coupling leg. Surplus resin 26 remains. This is because, in order to completely spread the resin inside the mold, it is necessary to inject more resin than necessary, and this excess resin becomes the surplus resin 26. Therefore, the excess resin 26 adhering to the coupling leg 25 when the push button cover 22 is taken out from the mold is removed manually by using a file, but the coupling leg 25 is damaged unless care is taken. There is a fear. As described above, since the cross-sectional area of the coupling leg 25 is small, if it is scratched, the waist becomes weak or breaks, which may hinder the operation of the push button switch.
[0011]
Accordingly, an object of the present invention is to arrange the power converter housing device so as to effectively cool the air to suppress the increase in size of the device and waste of energy, and the power converter can be installed even in a different mounting posture. It is to prevent the leakage of the secondary battery electrolyte from causing damage to the surroundings and from causing defects in the narrow cross-sectional area when the synthetic resin push button cover is integrally formed.
[0012]
[Means for Solving the Problems]
To achieve the above object, the present invention provides a printed board on which a power semiconductor element is mounted, a filter circuit including a reactor, a cooling fan, a secondary battery, and a push button mounted on the printed board. In the power conversion device including the switch, the power semiconductor element mounted on the printed board with the cooling airflow generated by the cooling fan, the airflow passage for collectively cooling the reactor, and the secondary battery are installed. In any case where the secondary battery is in a specific posture or a posture that is 90 degrees different from the secondary battery, the secondary battery covers the electrolyte receiving pan capable of storing the electrolyte leaking from the secondary battery, and the push button switch. A pressurizing part corresponding to the push button switch and a coupling leg that couples the pressurizing part with elasticity and flexibility. Synthetic resin is injected from the vicinity of the coupling leg and integrally molded. It shall be equipped with a push button that cover.
[0013]
In the present invention, an opening is provided at a location corresponding to the push button switch of the push button cover that covers the push button switch mounted on the surface of the printed board constituting the power conversion device, and the pressurizing portion is provided in the opening. The pressurizing part and the periphery of the opening are joined by a joint leg having elasticity and flexibility, and the pressurization part and the joint leg are molded integrally with a synthetic resin together with the push button cover. In the power conversion device including the push button cover having the configuration, a synthetic resin injection port for molding the push button cover integrally is provided near the coupling leg.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a structural diagram showing a first embodiment of the present invention, and shows a right side cross section of an uninterruptible power supply as a power converter.
The names, applications, and functions of the battery chamber 1, lead storage battery 2, power conversion device chamber 10, reactor 12, printed board 13, semiconductor element 14, and heat radiation fin 15 illustrated in the first embodiment of FIG. 6 (b) is the same as the conventional example described above, and the description of the same part is omitted.
[0015]
In the first embodiment of FIG. 1, the device arrangement in the power conversion device room 10 occupying the upper half of the uninterruptible power supply is different from the conventional example shown in FIG. 14 and the radiating fin 15 can be cooled together by the cooling air flow, and the cooling air flow generated by the cooling fan 16 is not divided into two by the device mounting plate 11.
[0016]
FIG. 2 is a structural diagram showing a second embodiment of the present invention. FIG. 2 (a) is a front view of an uninterruptible power supply as a power converter, FIG. 2 (b) is a right side view thereof, FIG. 2 (c) represents a plan view thereof. However, the right side view of FIG. 2B is the same as that of the first embodiment already described in FIG.
[0017]
The reactor 12 is cooled by the cooling air flow generated in the direction of the arrow by the cooling fan 16, and when the plurality of reactors 12 are arranged in a straight line along the cooling air flow (see FIG. 6A), The cooling effect of the leeward reactor 12 is lower than that of the leeward reactor 12. Therefore, since the plurality of reactors 12 are arranged so as not to be in a straight line along the cooling air flow (see FIGS. 2A and 2C), sufficient cooling air is supplied also to the leeward side. .
[0018]
FIG. 3 is a structural view showing a third embodiment of the present invention, and shows a state in which two electrolyte receiving trays are combined in an L shape. That is, the lower electrolyte receiver 4 and the lateral electrolyte receiver 5 are combined in an L shape, and the lead storage battery 2 is accommodated therein. When the electrolyte leaks in the state shown in the drawing, the lower electrolyte receiver 4 on the lower side of the lead storage battery 2 receives the electrolyte, but in the state rotated 90 degrees, the lateral electrolyte receiver 5 is below the lead storage battery 2. This will catch the leakage of electrolyte.
[0019]
The usage state of the electrolytic solution tray in the combination shown in FIG. 3 is illustrated in the first embodiment described above with reference to FIG. That is, in the battery chamber 1 in the lower half of the uninterruptible power supply apparatus, there are a lower electrolyte receiver 4 and a lateral electrolyte receiver 5 combined in an L shape, and the lead storage battery 2 is accommodated therein. Therefore, when the uninterruptible power supply is in the illustrated upright state, the lower electrolyte receiver 4 receives leakage of the electrolyte. When the uninterruptible power supply is in an upright state, it is tilted so that the left side is down. At this time, there is a lateral electrolyte receiver 5 under the lead storage battery 2 to catch the leakage of the electrolyte. In FIG. 1, in order to reduce the overall height, the lead storage battery 2 is installed sideways.
[0020]
FIG. 4 is a structural view showing a fourth embodiment of the present invention, and shows an enlarged window portion of the push button cover. In the fourth embodiment, a resin injection port for molding the push button cover 22 is provided in the peripheral portion of the window 23. Even if the peripheral portion of the window 23 is damaged when removing the surplus resin 26, there is no particular problem, and since the resin injection port is close to the coupling leg 25, it is possible to suppress the occurrence of defects when the push button cover 22 is molded.
[0021]
FIG. 5 is a structural view showing a fifth embodiment of the present invention, and shows an enlarged window portion of the push button cover. In the fifth embodiment, since the resin inlet for molding the push button cover 22 is provided in the pressurizing portion 24, the resin always passes through the coupling leg 25 when the push button cover 22 is molded. Therefore, it is possible to avoid the possibility of forming defects. Further, there is no particular problem even if the pressurizing portion 24 is damaged when the excess resin 26 is removed.
[0022]
【The invention's effect】
Conventional power converters have various devices attached to both sides of a device mounting plate in the device. Therefore, since the inside of the apparatus is divided into two by this equipment mounting plate, the cooling air flow is also divided into two, but it is difficult to properly distribute the flow rate. Therefore, the capacity of the cooling fan is increased more than necessary to cool the equipment, so that there is a disadvantage that the entire apparatus becomes large and wastes energy. On the other hand, in the present invention, by arranging the devices so that there is only one passage for the cooling air, the capacity of the cooling fan is not increased, and adjustment of the flow rate distribution is not required. The effect that can suppress the waste and waste of energy.
[0023]
In addition, if the electrolyte of the secondary battery stored in the power converter leaks out, there is a risk of damaging the leading device, but in the present invention, two electrolyte receivers are combined in an L shape and the secondary battery is contained therein. By storing the battery, the L-shaped electrolyte receiver catches the leakage of the electrolyte even when the power conversion device is installed in a posture different from the normal posture by 90 degrees for convenience of installation. The effect of preventing fouling and corrosion can be obtained.
[0024]
The push button switch attached to the surface of the power converter is operated by pressing a pressurizing portion provided on a synthetic resin push button cover covering the switch. The pressure part and the thin coupling leg are integrally molded together with the push button cover. Conventionally, since the resin inlet is provided in the coupling leg when integrally molding, the excess resin remaining in the inlet There was a risk of damaging the thin connecting legs when removing the skin. In the present invention, the resin injection port is provided in the pressurizing portion, so that the resin can be surely spread even with the thin joint legs during integral molding, and the risk of damaging the thin joint legs when removing excess resin can be avoided. can get.
[Brief description of the drawings]
FIG. 1 is a structural diagram illustrating a first embodiment of the present invention. FIG. 2 is a structural diagram illustrating a second embodiment of the present invention. FIG. 3 is a structural diagram illustrating a third embodiment of the present invention. 4 is a structural diagram showing a fourth embodiment of the present invention. FIG. 5 is a structural diagram showing a fifth embodiment of the present invention. FIG. 6 is a structural diagram showing an internal structure of a conventional small capacity uninterruptible power supply. FIG. 7 is a structural diagram showing a conventional example of a push button cover for protecting a push button switch attached to the surface of an uninterruptible power supply. FIG. 8 shows a state after integral molding when a resin injection port is provided on a coupling leg. Partial structure diagram of push button cover partially showing conventional example [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Battery chamber 2 Lead acid battery 3 as a secondary battery 3 Electrolyte receptacle 4 Lower electrolyte receptacle 5 Lateral electrolyte receptacle 10 Power conversion equipment chamber 11 Equipment mounting plate 12 Reactor 13 Print board 14 Semiconductor element 15 Radiation fin 16 Cooling fan 22 push button cover 23 window 24 pressure part 25 coupling leg 26 surplus resin 27 LED display window

Claims (5)

In a power converter including a printed board on which a power semiconductor element is mounted, a filter circuit including a reactor, a cooling fan, a secondary battery, and a push button switch mounted on the printed board,
An air flow path for collectively cooling the power semiconductor element mounted on the printed board with the cooling air flow generated by the cooling fan and the reactor;
In the case where the secondary battery is installed and the secondary battery is in a specific posture or a posture different from this by 90 degrees, an electrolytic solution tray capable of storing the electrolytic solution leaking from the secondary battery;
Covering the push button switch, having a pressure part corresponding to the push button switch and a coupling leg for coupling the pressure part with elasticity and flexibility, and injecting synthetic resin from the vicinity of the coupling leg to integrally mold A power conversion device comprising a molded push button cover. The power conversion device according to claim 1,
A power conversion device , wherein a plurality of reactors constituting the filter circuit are installed in the air flow passage so as not to be in a straight line along a direction of the cooling air flow . The power conversion device according to claim 1,
The said electrolytic solution tray is comprised by combining two boxes which consist of a bottom and a surrounding wall in L shape, The power converter device characterized by the above-mentioned. An opening is provided at a location corresponding to the push button switch of the push button cover that covers the push button switch mounted on the surface of the printed board constituting the power conversion device, and the pressurizing portion is located in the opening, and this pressurization is performed. A push button cover having a configuration in which the pressing portion and the coupling leg are integrally molded with a synthetic resin together with the push button cover. In the power converter provided,
A power conversion device characterized in that a synthetic resin injection port for molding the push button cover integrally is provided near the coupling leg . In the power converter according to claim 1 or 4,
A power conversion device characterized in that an inlet for the synthetic resin is provided in the pressurizing portion .

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