JP2003249778A - Cabinet rack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the height of a power source circuit part in a lower part of the conventional cabinet rack, and further the height of a cabinet rack, and prevent malfuction which is to be caused by power source noise and spurious radiation. <P>SOLUTION: In the power source circuit in the lower part of a cabinet rack, a transformer or an inductor constituted by collecting a plurality of unit transformers or inductors whose height is uniform are used as a power source circuit of low height by using a transformer or an inductor in which a plurality of unit windings are installed on a closed magnetic path core. The noise filter function for a high frequency band in which a capacitor or a ferrite core is loaded is imparted to a bus-bar for power supply which stretches upward from the power source circuit in the lower part of a cabinet, and a radio wave absorbent is arranged between plug-in units, thereby constituting a cabinet rack. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cabinet rack for accommodating electronic equipment, and more particularly to a power supply circuit and an EMI (electromagnetic interference) countermeasure filter constituting the power supply circuit.

[0002]

2. Description of the Related Art In recent years, electronic equipment that accommodates electronic equipment and electronic circuits and cabinet racks from surge voltage such as lightning, or external noise, has advanced sophistication of protection performance and high internal density. The demand for storage is increasing. As shown in FIG. 2, this type of cabinet rack accommodates a large number of plug-in units 5 shown in FIG. 3 from the top and bottom of a rectangular frame with angles and the like, and the four side faces from the front or front and back. And a side plate is screwed to the other surface. As for the internal configuration, the power supply line is drawn into the lower power supply circuit 2, and the transformer placement section 3 and the noise filter section 4 are passed through the intermediate section and the upper subrack to supply power with the bus bar 12. There is also a type in which a ventilation hole for collecting air and a ventilation hole for discharging air are provided in the lower part of the cabinet rack and the fan is rotated to forcibly cool air in order to dissipate heat generated by the internal circuit.

Since a block-shaped transformer or inductor as shown in FIG. 4 is used as a conventional transformer or inductor of a power supply circuit in the lower part of a cabinet rack, if the space ratio around the transformer or inductor is large and the height is low. There wasn't. Since such a transformer or inductor is used, the power supply circuit section 2 in the lower part of the cabinet rack becomes high as shown in FIG. 2, the accommodation rate of the plug-in unit is low, and the height of the entire rack is high.

Further, AA 'which is a schematic diagram for explaining FIG.
As shown in the cross-sectional view, power was supplied to the layers above the lower power supply circuit via the bus bar, but intermodulation occurred between the sub racks of each layer via the bus bar and superimposition on the power supply caused malfunctions. It was the cause. A metal plate was placed between the plurality of plug-in units 5 housed in the subrack 1 shown in FIG. 3 for shielding and grounding to the cabinet rack cabinet, but it was induced in the shield plate by the effect of residual inductance. It was difficult to drop the noise component to the ground, and unnecessary radiation from the internal circuit of the plug-in unit was reflected by the metal shield plate and interfered with the adjacent circuit. Therefore, interference due to unnecessary radiation between the internal circuits of the plug-in unit has been a cause of malfunction of the electronic device.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a power supply circuit at a lower portion of a conventional cabinet rack, in particular, a transformer or an inductor is made to have a low profile, and a space ratio around the transformer or the inductor is made small, so that the upper layer of the rack can be provided. This is to increase the accommodation rate and to prevent the intermodulation between layers in the rack from being superimposed on the power supply. It is also necessary not to cause interference due to unnecessary radiation between the circuits of the plug-in unit in the subrack of each level of the cabinet rack.

[0006]

In a cabinet rack having a power supply circuit at a lower part of a housing, the power supply circuit is configured by using surge absorbing means and at least one of a transformer, an inductor, and a noise filter, and particularly a transformer. Alternatively, the inductor is configured by assembling a plurality of small transformers or inductors to reduce the height of the power supply circuit.

The conventional transformer or inductor shown in FIG. 4 is not in a block shape, but a plurality of small transformers or inductors can share the function as shown in FIG. Since the space can be reduced and the area can be effectively used to lower the height of the power supply circuit, a low-height cabinet rack as shown in FIG. 1 can be constructed. Alternatively, the power supply circuit section may be housed in a single thin rack, and a cabinet rack housing the subrack may be stacked thereon. Prepare a power supply circuit section with various ratings according to the requirements such as power supply voltage, maximum current, frequency band of noise attenuation, etc., and place the cabinet rack on the power supply circuit section suitable for the electronic circuit in the cabinet rack. It can be stacked and connected to the power supply circuit unit. Further, when the internal heat generation of the power supply circuit section is large, it is necessary to provide a separate heat dissipation structure so that heat transfer or convection does not occur in the subrack above the cabinet rack. Dividing the function of the transformer or inductor into multiple small transformers or inductors is a small transformer that minimizes the wasted space in consideration of the allowable area occupied by the power supply circuit and the layout of other components. Alternatively, the number and shape of inductors are determined.

Further, in the present invention, in a cabinet rack having a power supply circuit in a lower portion of a housing, the power supply circuit is composed of at least one of a surge absorbing means, a transformer, an inductor and a noise filter, and particularly the transformer or the inductor. In order to reduce the height of the power supply circuit, a plurality of unit windings are attached to a closed magnetic circuit core to form a transformer or an inductor.

As shown in FIG. 6, by mounting a plurality of unit windings 7 on a closed magnetic circuit core 6 formed by laminating magnetic steel sheets and sharing the electric power by each winding, it is possible to realize a low profile transformer or inductor. . Divide the function of the transformer or inductor into multiple windings by considering the allowable area of the power supply circuit and the layout of other components so that the number of windings is minimized. And the shape is determined as described above. Further, as shown in FIG. 9, a small transformer or inductor may be combined with a transformer or inductor having a plurality of unit windings mounted thereon.

Further, in the cabinet rack according to the present invention, a capacitor and / or a ferrite core is mounted on a power supply bus bar extending upward from a power supply circuit at a lower part of the housing to provide a high frequency band noise filter. Have a function.

External noise has a lot of low frequency components and is blocked by the power supply circuit. However, as a measure to prevent noise from being transmitted between the sub racks of each level in the cabinet rack through the bus bar that supplies power to each level, Capacitors and / or ferrite cores are mounted on the bus bars of each subrack, and a high-frequency band noise filter function is provided to prevent interference of high-frequency components between the subrack of each level in the cabinet rack. .

Further, the present invention is characterized in that a radio wave absorber is provided between a plurality of plug-in units 5 accommodated in the subrack of the cabinet rack to prevent reflection of unnecessary radiation on the shield plate. It is a cabinet rack.

By partitioning a plurality of plug-in units 5 housed in the subrack 1 shown in FIG. 3 by a partition wall (not shown) made of a radio wave absorber or attached with the radio wave absorber, a plug-in unit is formed. It is possible to prevent unnecessary radiation in the meantime from being reflected by the shield plate and to prevent interference of high frequency components, so that the electronic device does not malfunction.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION In a cabinet rack having a power supply circuit at the bottom of a housing, a transformer or an inductor of a power supply circuit configured by using at least one of surge absorbing means, a transformer, an inductor and a noise filter is installed. , A plurality of small transformers share the electric power to construct a low profile.

As shown in FIG. 5, the conventional block-shaped transformer or inductor shown in FIG. 4 is divided into four parts to form four small transformers or inductors. The power supply circuit can be reduced in height by sharing the power with a unit transformer or inductor that shares multiple power with a transformer or inductor, which in turn makes it possible to reduce the height of the power supply circuit in the cabinet rack and thus reduce the height of the cabinet rack. You can

Further, a transformer or an inductor is constructed by mounting a plurality of unit windings on a closed magnetic circuit core to construct a cabinet rack in which the power supply circuit has a low profile. As shown in FIG. 6, a plurality of unit windings 7 are mounted on the closed magnetic circuit core 6 formed by stacking magnetic steel plates, and the unit windings share the electric power.
Since it is possible to reduce the height of the transformer or inductor, it is possible to reduce the height of the power circuit of the cabinet rack.
The height of the cabinet rack can be reduced as described above.

Further, in the above cabinet rack, as shown in the AA 'sectional view which is a schematic diagram for explaining in FIG. 1, from the power supply circuit in the lower part of the housing to the power supply bus bar 12 extending upward. For each subrack of the hierarchy, a cabinet rack is configured to supply power through the high frequency band noise filter function 13.

In the cabinet rack described above, a partition wall (not shown) made of a radio wave absorber or having a radio wave absorber attached between a plurality of plug-in units 5 accommodated in the subrack 1 shown in FIG. Interference due to unnecessary radiation between the partition and the plug-in unit 5 is prevented.

[0019]

[Embodiment 1] In order to configure the power supply filter circuit shown in FIG. 11, the transformer 10, the inductor 11 and the capacitor 8 are arranged at the same height and arranged as shown in FIG. It is arranged in a part (surge absorber is not shown). An arrester, a varistor or the like is used as the surge absorbing means, but since it is small, it does not pose a problem when arranging the arrangement. By arranging the heights of the components to be the same, we were able to reduce the wasted space and reduce the height.

[0020]

Second Embodiment Similarly, in order to form the power supply filter circuit shown in FIG. 10, the inductor 11 is made up of two inductors as shown in FIG. 12, and the capacitors 8 are arranged at symmetrical corners. , Placed in a part of the power circuit at the bottom of the cabinet rack.

[0021]

Third Embodiment Similar to the second embodiment, in order to construct the power supply filter circuit of FIG. 10, the inductor 11 has a closed magnetic circuit in which two unit windings are laminated with the same magnetic steel sheet as illustrated in FIG. It was attached to the core to form a common mode inductor, and capacitors were placed on both ends and placed in a part of the power circuit under the cabinet rack.

[0022]

[Embodiment 4] In the cabinet rack described above, as shown in the AA 'sectional view which is a schematic diagram for explaining in FIG. As a noise filter function 13 for the high frequency band, a cabinet rack that supplies power through a feedthrough capacitor is configured at the input portion of the subrack 1 of each layer of the power supply bus bar 12 that extends to.

[0023]

Fifth Embodiment As a radio wave absorber on each partition wall of a plurality of plug-in units 5 accommodated in the subrack 1 shown in FIG.
A non-woven wave absorber containing carbon powder was attached (not shown) and housed in a subrack. As a result, unnecessary radiation from the circuit of the plug-in unit in the subrack is absorbed by the radio wave absorber and can be prevented from being reflected by the shield plate, so that there is no interference between the circuits and the device does not malfunction. Depending on the frequency to be attenuated, it is possible to use a radio wave absorber mixed with nickel-zinc ferrite powder, and the attenuation frequency band can be selected by changing the thickness of the non-woven wave radio wave absorber. . Furthermore, the attenuation frequency band can be widened by using a radio wave absorber in which carbon powder and nickel-zinc ferrite powder are mixed.

[0024]

According to the present invention, the power transformer or the inductor at the lower portion of the conventional cabinet rack is made low in height, the space ratio around the transformer or the inductor is made small, the power supply circuit section is made low in height, and the cabinet rack is made low in height. can do. Further, noise of the hierarchy in the cabinet rack does not overlap with the power source, and interference of unnecessary radiation does not occur between the circuits of the plug-in unit in the subrack, so that the electronic circuit does not malfunction.

[Brief description of drawings]

1 shows a perspective view of a cabinet rack according to the invention and a cross-sectional view which is a schematic diagram for explanation.

FIG. 2 shows a perspective view of a cabinet rack of the present invention and a cross-sectional view which is a schematic diagram for explanation.

FIG. 3 shows a subrack accommodating a plug-in unit.

FIG. 4 shows an example of a conventional transformer or inductor.

FIG. 5 shows an arrangement example of a configuration using a small transformer or an inductor.

FIG. 6 is an explanatory diagram in which a plurality of unit windings are mounted on a closed magnetic circuit core.

FIG. 7 shows an arrangement example in which a filter is composed of an inductor and a capacitor.

FIG. 8 shows an example of a circuit diagram of a power supply noise filter.

FIG. 9 shows an arrangement example of a transformer and an inductor.

FIG. 10 shows a power supply filter circuit diagram.

FIG. 11 shows another circuit diagram example of the power supply noise filter.

FIG. 12 shows a configuration example of a power supply noise filter.

[Explanation of symbols]

1 subrack 2 power supply 3 transformer placement section 4 Noise filter section 5 plug-in unit 6 closed magnetic circuit core 7 windings 8 capacitors 9 Surge absorption element (varistor) 10 transformers 11 inductor 12 bus bars 13 High frequency band noise filter function

─────────────────────────────────────────────────── ─── Continued Front Page (51) Int.Cl. ⁷ Identification Code FI Theme Coat (Reference) H05K 9/00 G06F 1/00 312L

Claims (4)

[Claims] 1. In a cabinet rack having a power supply circuit at a lower part of a housing, the power supply circuit includes at least one of a surge absorbing means, a transformer, an inductor, and a noise filter, and the transformer or the inductor has a plurality of small sizes. A cabinet rack that is made up of a transformer or inductor and has a low profile. 2. In a cabinet rack having a power supply circuit at the bottom of a housing, the power supply circuit is composed of at least one of surge absorbing means, a transformer, an inductor, and a noise filter, and the transformer or inductor is a plurality of units. A cabinet rack characterized in that the winding is attached to a closed magnetic circuit core to reduce the height. 3. The cabinet rack according to claim 1, wherein the power supply bus bar extending upward from the power supply circuit at the bottom of the housing has a high frequency band noise filter function. Cabinet rack that is characterized. 4. The cabinet rack according to claim 1, further comprising a radio wave absorber between the plug-in units housed in the subrack.