CN215956042U - Switch power supply - Google Patents

Abstract

The embodiment of the utility model discloses a switching power supply, and relates to the technical field of power electronics. The method comprises the following steps: the power distribution system comprises an alternating current power distribution unit, a rectifying unit, a direct current power distribution unit and a control unit, wherein the output end of the alternating current power distribution unit is electrically connected with the input end of the rectifying unit, the output end of the rectifying unit is electrically connected with the direct current power distribution unit, and the control unit is respectively electrically connected with the alternating current power distribution unit, the rectifying unit and the direct current power distribution unit; the direct current distribution unit comprises a plurality of paths of load down current shunts, each path of load down current shunt comprises a first circuit breaker and a first contactor, a first end main contact of the first contactor is electrically connected with the output end of the rectification unit, a second end main contact of the contactor is connected with a first end of the circuit breaker in series, and a second end of the first circuit breaker is a load output end; and the coil terminal of the first contactor is electrically connected with the control unit. The utility model can independently control and manage the load branches.

Description

Switch power supply

Technical Field

The utility model relates to the technical field of power electronics, in particular to a switching power supply.

Background

At present, telecommunication operator is according to the difference of business demand, and the power supply requirement to communication base station also is different, for optimizing power supply efficiency and reduce cost, realizes carrying out the differentiation power supply management to 2G, 3G, 4G, 5G access network and different operator user is the technical problem that awaits solution urgently.

In some existing differentiated power supply solutions, for example, a customer power supply modular power supply can perform unified management on power supply for each user on a load, but cannot realize separate control management in a branch way, and is inconvenient to realize differentiated power supply management according to different requirements.

SUMMERY OF THE UTILITY MODEL

In view of this, the embodiment of the present invention provides a switching power supply, which can independently control and manage load branches, so as to facilitate implementing differentiated power supply management according to different requirements.

In order to achieve the above object of the present invention, a switching power supply according to an embodiment of the present invention includes: the power distribution system comprises an alternating current power distribution unit, a rectifying unit, a direct current power distribution unit and a control unit, wherein the output end of the alternating current power distribution unit is electrically connected with the input end of the rectifying unit, the output end of the rectifying unit is electrically connected with the direct current power distribution unit, and the control unit is respectively electrically connected with the alternating current power distribution unit, the rectifying unit and the direct current power distribution unit; the direct current distribution unit comprises a plurality of paths of load down current shunts, each path of load down current shunt comprises a first circuit breaker and a first contactor, a first end main contact of the first contactor is electrically connected with the output end of the rectification unit, a second end main contact of the contactor is connected with a first end of the circuit breaker in series, and a second end of the first circuit breaker is a load output end; and the coil terminal of the first contactor is electrically connected with the control unit.

Optionally, the first contactor is an on-board contactor.

Optionally, the dc power distribution unit further includes a plurality of paths of power protection lower electric load branches, each path of power protection lower electric load branch includes a second circuit breaker, a first end of the second circuit breaker is electrically connected with an output end of the rectifying unit, a second end of the second circuit breaker is a load output end, and a second end of the second circuit breaker is electrically connected with the control unit.

Optionally, the dc distribution unit further includes a standby power supply branch, the standby power supply branch includes a battery pack, a third circuit breaker and a second contactor, the positive pole of the battery pack with the positive output end of the rectifying unit is electrically connected, the negative pole of the battery pack with the first end series connection of the third circuit breaker, the second end of the third circuit breaker with the first end series connection of the second contactor, the second end of the second contactor with the negative output end of the rectifying unit is electrically connected, the first end of the third circuit breaker still with the control unit is electrically connected.

Optionally, a shunt is further connected in series in the load discharging electrical shunt, the electrical protection discharging electrical load shunt, and the standby power supply shunt, and the shunt is further electrically connected to the control unit.

Optionally, the ac power distribution unit includes an input lightning protection circuit, and an output lightning protection circuit is disposed at an output end of the rectification unit.

Optionally, the first circuit breaker, the second circuit breaker and the third circuit breaker are respectively 1U pluggable circuit breakers, and the second contactor is a 1U magnetic latching contactor.

Optionally, the switching power supply further comprises a case, the case is divided into an upper layer and a lower layer, the direct current distribution unit and the control unit are located on the upper layer inside the case, the direct current distribution unit and the control unit are adjacently arranged on the left and right sides, the alternating current distribution unit and the rectification unit are arranged on the lower layer inside the case, and the alternating current distribution unit and the rectification unit are adjacently arranged on the left and right sides. The alternating current distribution unit is located in the space of 1U x 2U on the left side of the lower layer in the case, and the direct current distribution unit is located in the space of 19 inches on the left side of the upper layer in the case.

Compared with the prior art of unified management of the household standby power, the switching power supply provided by the embodiment of the utility model at least improves the direct-current power distribution unit, the direct-current power distribution unit comprises a plurality of paths of load power-down branches, each path of load power-down branch comprises a first circuit breaker and a first contactor, a first end main contact of the first contactor is electrically connected with the output end of the rectifying unit, a second end main contact of the contactor is connected with the first end of the circuit breaker in series, the second end of the first circuit breaker is a load output end, and a coil terminal of the first contactor is electrically connected with the control unit. Therefore, the first contactors for on-off control are respectively arranged in the electric shunts under each load and are electrically connected with the control unit, and the load shunts can be independently controlled and managed, so that differentiated standby power management can be realized according to different requirements.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic circuit diagram of a switching power supply according to an embodiment of the present invention;

FIG. 2 is a circuit diagram of a switching power supply according to another embodiment of the present invention;

FIG. 3 is a front view of an embodiment of a switching power supply of the present invention;

FIG. 4 is a top view of an embodiment of the switching power supply of the present invention with the top cover removed;

fig. 5 is a top view of the switching power supply of the embodiment of the utility model with the upper structure of the chassis removed;

FIG. 6 is a rear view of an embodiment of a switching power supply of the present invention;

fig. 7 is an isometric view of one embodiment of a switching power supply of the present invention;

fig. 8 is a schematic circuit diagram of a switching power supply according to another embodiment of the utility model.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

It should be apparent that numerous technical details are set forth in the following specific examples in order to provide a more thorough description of the present invention, and it should be apparent to one skilled in the art that the present invention may be practiced without some of these details. In addition, some methods, means, components and applications thereof known to those skilled in the art are not described in detail in order to highlight the gist of the present invention, but the implementation of the present invention is not affected thereby. The embodiments described herein are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 8, a Switching Mode Power Supply (Switching Mode Power Supply) according to an embodiment of the present invention is suitable for industrial control, Power and communication devices.

As shown in fig. 1, the switching power supply includes: the power distribution system comprises an alternating current power distribution unit, a rectifying unit, a direct current power distribution unit and a control unit, wherein the output end of the alternating current power distribution unit is electrically connected with the input end of the rectifying unit, the output end of the rectifying unit is electrically connected with the direct current power distribution unit, and the control unit is respectively electrically connected with the alternating current power distribution unit, the rectifying unit and the direct current power distribution unit;

the alternating current distribution unit outputs alternating current to a rectifying unit consisting of four AC/DC rectifying modules through a printed board plug connector; after the rectifying unit converts the 220V alternating current into 48V direct current, the direct current is distributed to the direct current distribution unit through the busbar; the direct current distribution unit is used for carrying out electric quantity distribution management and realizing a load shunt differential power supply function.

The direct current distribution unit comprises a plurality of paths of load down current shunts, each path of load down current shunt comprises a first circuit breaker and a first contactor, a first end main contact of the first contactor is electrically connected with the output end of the rectification unit, a second end main contact of the contactor is connected with a first end of the circuit breaker in series, and a second end of the first circuit breaker is a load output end; and the coil terminal of the first contactor is electrically connected with the control unit. With continued reference to fig. 1, in some embodiments, the dc distribution unit includes a three-way load lower electrical shunt, which controls the on/off of each of the three-way load lower electrical shunt through a first contactor on the load lower electrical shunt, respectively, so as to achieve independent control of power-up and power-down. The first circuit breakers of the three-way load lower electric shunt circuit respectively adopt three 100A circuit breakers QF 8-QF 10; the first contactors on the electric branch under the three-way load are onboard contactors KM 2-KM 4 respectively.

Referring to fig. 2, in some embodiments, the under-load electrical shunt includes a large-capacity under-load electrical shunt and a small-capacity under-load electrical shunt, wherein different types of under-load electrical shunts can be set according to specific electrical load combinations, and in fig. 2, the large-capacity under-load electrical shunt includes three paths, the paths use first circuit breakers of 100A (ampere) current respectively, and the small-capacity under-load electrical shunt includes four paths, the paths use first circuit breakers of 63A current respectively; of course, in practical applications, the first circuit breaker with the corresponding rated operating current may be specifically selected according to the power of the specific electrical load.

The first contactors on the electric branch under the low-capacity load are onboard contactors KM 5-KM 8 respectively.

It can be understood that, with the advance of the deployment of the 5G base station power supply, the power consumption of the base station is increased, the density of the built station is increased, the site selection of the base station is difficult, especially, the capacity expansion and reconstruction of the base station is limited by the space, the implementation of the capacity expansion project of the station is limited by the volume of the power supply of the communication base station, and the technical problem to be solved is to push the-48V base station communication power supply to develop towards the direction of small volume and high density.

Compared with the traditional communication base station standby power equipment adopting independent electronic components to be assembled on a PCB (printed Circuit Board), in the embodiment, the onboard contactors are respectively adopted by the first contactors on the electric branches under the three loads, so-called onboard is integrated, the utilization rate of the installation space of the existing base station can be improved, and the structural design difficulty and the material cost can be reduced.

In addition, it can be understood that, in the design of the existing intelligent circuit breaker, a chip and an MOS device generally need to be configured separately to implement power-on and power-off control of an electrical shunt under load, the chip needs to be designed for direct current lightning protection, and the MOS device is a high-power switching device, and the heat dissipation problem of the MOS device needs to be considered when the circuit is designed.

In this embodiment, the first contactor is through adopting board-mounted contactor, and the direct current contactor board AP5 that is integrated with first contactor is carried out power-on, power-off control by the control unit, and direct current contactor board AP5 need not to dispose chip and MOS tube device, when reducing whole volume, has avoided the direct current lightning protection problem and the heat dissipation problem that exist in the design of current intelligent circuit breaker, can effectively reduce the design degree of difficulty and the cost of structure.

As shown in fig. 1 and fig. 2, in some embodiments, each of the under-load electrical shunts further includes a first shunt, for example, first shunts RS6, RS7 and RS8 are respectively disposed for three under-load electrical shunts, the first shunts RS6, RS7 and RS8 may be flat shunts for collecting current of the under-load electrical shunt, a first end of the first shunt is electrically connected to the output end of the rectifying unit, a second end of the first shunt is electrically connected to the first end main contact of the first contactor, the first shunt is further electrically connected to the control unit for sending the collected current of the under-load electrical shunt to the control unit, and the control unit performs power metering according to the collected current and controls on and off of the under-load electrical shunt.

Specifically, a coil terminal of the first contactor is electrically connected with the control unit through a direct current contactor board AP5, and a secondary signal acquisition terminal of the first shunt is electrically connected with the control unit. Therefore, the control unit judges whether the current of each branch circuit exceeds the current limiting threshold value or not under the load by detecting the current of each branch circuit, and when the current of each branch circuit exceeds the current limiting threshold value, the control unit cuts off the power supply of the load of the branch circuit by controlling the coil of the contactor.

With continued reference to fig. 1, in some embodiments, the dc power distribution unit further includes multiple power protection down load branches, each power protection down load branch including a second circuit breaker, a first end of the second circuit breaker being electrically connected to the output of the rectification unit, and a second end of the second circuit breaker being a load output.

In the communication base station, the electric protection level can be set for each branch of the electric protection lower electric load, so that the power supply of part of important loads can be uniformly cut off according to specific needs, the battery pack of the standby electric branch is protected, and the service life of the battery pack is prevented from being reduced due to over-discharge.

With continued reference to fig. 1, as with the under-load electrical shunt, in some embodiments, each of the electrical protection under-load electrical load shunts further includes a second shunt, and for example, the second shunts RS2, RS3, RS4 and RS5 are respectively disposed for four under-load electrical shunts, and the second shunts RS2, RS3, RS4 and RS5 may employ on-board shunts for collecting current of the under-load electrical shunt, which is similar to the advantage of employing on-board contactors, and by employing the on-board shunts, the overall structure volume may be reduced, and the space utilization may be improved. And the first end of the second shunt is electrically connected with the output end of the rectifying unit, and the second end of the second shunt is electrically connected with the first end of the second circuit breaker.

In some embodiments, the output end of the rectifying unit is also provided with an output lightning protection circuit FL 2.

In some embodiments, the dc power distribution unit includes four protection-under-voltage load shunts, and the four protection-under-voltage load shunts correspondingly adopt four 63A breakers QF 4-QF 7.

In order to ensure that the communication base station part equipment can still maintain normal operation in the case of mains power outage, in some embodiments, the dc power distribution unit further includes a backup power supply branch (i.e. a battery branch in fig. 1 and 2), where the backup power supply branch includes a battery pack, a third circuit breaker, and a second contactor, an anode of the battery pack is electrically connected to an anode output terminal of the rectification unit, a cathode of the battery pack is connected in series with a first end of the third circuit breaker, and a second end of the third circuit breaker is connected in series with a first end of the second contactor, and preferably, the second contactor is a 1U magnetic holding contactor; the second end of the second contactor is electrically connected with the negative output end of the rectifying unit, the first end of the third circuit breaker is also electrically connected with the control unit, and the third circuit breaker is at least used for protecting the safety of the battery pack.

When the voltage of the busbar is lower than a set threshold value, the control unit controls the second contactor to uniformly turn off the power-off protection load shunt circuit.

When the power-on and power-off control is required to be separately performed for the power-off load shunt of the electrical protection, as shown in fig. 2, the AP4 in fig. 1 is replaced by a printed board with a board-mounted contactor, and the control unit can separately power on and power off the corresponding power-off load shunt (similar to the circuit topology of the power-off load shunt at the left side in fig. 2) by controlling the third contactors KM5 to KM 8.

For an application example in which the electrical protection lower electrical load branches are modified to be individually controllable like in fig. 2, since each electrical protection lower electrical load branch is provided with a contactor, the second contactor KM1 of the backup power supply branch can be eliminated to simplify the circuit topology. The input ends of the standby power supply shunt circuit, the power protection lower electric load shunt circuit and the load lower electric shunt circuit are respectively and electrically connected with the output end of the rectifying unit through the busbar. The third breaker in the supply backup shunt employs two 125A battery breakers QF2 and QF 3.

In some embodiments, the power supply backup circuit further includes a third shunt, and illustratively, the third shunt RS1 is disposed corresponding to the power supply backup circuit, and the third shunt RS1 may be a flat shunt for collecting current of the power supply backup shunt. In summary, in some embodiments, shunts RS1 to RS8 are respectively connected in series in the under-load electrical shunt, the under-electrical-protection electrical load shunt, and the backup power supply shunt, the shunts are further electrically connected to the control unit, the shunts are configured to collect shunt currents and send the currents to the control unit, and the control unit performs, after receiving the currents, first metering of electric quantity and second charging and discharging management of the battery pack.

In some embodiments, the ac power distribution unit is configured to implement functions of lightning protection and input power metering in addition to completing access of three-phase ac power; therefore, the alternating current power distribution unit comprises an input lightning protection circuit FL1 and a metering unit AP 2.

Referring to fig. 5, the lightning protection circuit FL1 selects on-board class C lightning protection as the protection of the input power; the metering unit AP2 selects a three-phase electric energy metering board to be plugged on the AC distribution base board AP1, voltage signals are collected through pins, and current collection is realized by leading a three-phase live wire to respectively penetrate through an onboard Hall current sensor TA1, TA2 and TA 3; and the alternating current power supply and the acquired signal information are respectively transmitted to the rectifying unit and the control unit through the golden finger plug-in connector.

Referring to fig. 3 to 7, the switching power supply further includes a case, the inside of the case is divided into an upper layer and a lower layer, the dc power distribution unit and the control unit are located on the upper layer of the inside of the case, the dc power distribution unit and the control unit are adjacently arranged on the left and right sides, the ac power distribution unit and the rectification unit are located on the lower layer of the inside of the case, and the ac power distribution unit and the rectification unit are adjacently arranged on the left and right sides.

The alternating current distribution unit is located in the space of 1U x 2U on the left side of the lower layer in the case, and the direct current distribution unit is located in the space of 19 inches on the left side of the upper layer in the case.

Specifically, the first circuit breaker is connected with a first state detection circuit, which is used for detecting the output voltage state of the electrical shunt circuit under the load, and the other end of the first state detection circuit is connected to a contactor board AP 5; the second breaker is connected with a second state detection circuit and is used for detecting the output voltage state of the electric load shunt circuit under the electric protection; the other end of the second state detection circuit is connected to a contactor board AP 4; the first state detection circuit and the second state detection circuit are respectively provided with a diode for isolating the electric signals between the branches, and the circuit formed by the diodes can also be called as a backflow prevention circuit.

Therefore, by using the working principle that the diode is switched on in the forward direction and switched off in the reverse direction, the problem that when one path is switched off, the voltage of the other path is transmitted to the node, and a voltage difference cannot be formed, so that the control unit is difficult to detect the state of the switched-off path can be prevented.

And a battery state detection circuit is connected to the third breaker, and the voltage state detection of the battery is detected by the battery state detection circuit.

Namely, the second ends of the first circuit breaker, the second circuit breaker and the third circuit breaker are respectively and electrically connected with the control unit through a battery detection board AP3, an electric protection shunt current detection board AP4 and a direct current contactor board AP5, and the on-off state of the circuit breakers is judged in a voltage detection mode; the secondary terminals of the first shunt and the third shunt are respectively and electrically connected with the control unit, the secondary terminal of the second shunt is electrically connected with the control unit through a shunt current detection plate AP4, the control unit performs current metering by collecting signals of the secondary terminal of the shunt, and the control unit performs voltage metering by collecting positive and negative busbar voltage signals, so that load shunt electric quantity calculation and charge and discharge management of the battery pack are performed; the coil wiring terminal of the first contactor is electrically connected with the control unit through the direct current contactor board AP5, the coil wiring terminal of the second contactor is electrically connected with the control unit, and the control unit carries out open and closed control management on the first contactor and the second contactor through the judgment of positive and negative busbar voltage and the judgment of each shunt current.

Referring to fig. 1 to 5 and 8, in this embodiment, the control unit is a 1U by 4U control unit, and is connected to the ac power distribution base plate AP1, the battery detection plate AP3, the shunt current detection plate AP4, the contactor plate AP5, and the rectifier unit to collect information of the ac power distribution unit, the dc power distribution unit, and the rectifier unit and monitor and manage the units; three on-board contactors KM 2-KM 4 of the direct current distribution unit can be independently powered on and powered off, and can realize the functions of remotely defining shunt capacity and remotely turning on and off breakers QF 8-QF 10 in an electric shunt under a load by communicating with an upper computer.

Furthermore, the current and the bus voltage of each shunt RS 1-RS 8 of the direct current unit can be collected, and the electric quantity can be measured and counted. The control unit in this embodiment integrates the functions of the modular power supply and the differentiated power backup device, so that the size and cost of the hardware respectively configured for the controllers are reduced, the arrangement can be completed in a 1U by 2U space on the premise of not increasing the hardware cost and space, and the space is saved.

The switching power supply provided by the embodiment of the utility model is characterized in that at least through improving the direct current distribution unit, the direct current distribution unit comprises a plurality of paths of load down current branches, each path of load down current branch comprises a first circuit breaker and a first contactor, a first end main contact of the first contactor is electrically connected with the output end of the rectifying unit, a second end main contact of the first contactor is connected with a first end of the circuit breaker in series, a second end of the first circuit breaker is a load output end, and a coil terminal of the first contactor is electrically connected with the control unit. Therefore, the first contactors for on-off control are respectively arranged in the electric shunts under each load and are electrically connected with the control unit, and the load shunts can be independently controlled and managed, so that differentiated standby power management can be realized according to different requirements.

Furthermore, the switching power supply provided by the embodiment of the utility model can be used as a customized micro switching power supply product, the communication base station is expanded and built by adopting the switching power supply, the space of the base station can be saved, the functions of a modular power supply and differentiated standby power equipment are achieved, and the switching power supply has high working reliability and low cost.

It is noted that, herein, the terms "upper", "lower", and the like, indicate orientations or positional relationships and are used for convenience in describing the present invention and for simplicity in description, but do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through an intermediate. Relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. As will be appreciated by one of ordinary skill in the art, the situation may be specified.

The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (9)

1. A switching power supply, comprising: the power distribution system comprises an alternating current power distribution unit, a rectifying unit, a direct current power distribution unit and a control unit, wherein the output end of the alternating current power distribution unit is electrically connected with the input end of the rectifying unit, the output end of the rectifying unit is electrically connected with the direct current power distribution unit, and the control unit is respectively electrically connected with the alternating current power distribution unit, the rectifying unit and the direct current power distribution unit;

the direct current distribution unit comprises a plurality of paths of load down current shunts, each path of load down current shunt comprises a first circuit breaker and a first contactor, a first end main contact of the first contactor is electrically connected with the output end of the rectification unit, a second end main contact of the contactor is connected with a first end of the circuit breaker in series, and a second end of the first circuit breaker is a load output end;

and the coil terminal of the first contactor is electrically connected with the control unit.

2. The switching power supply according to claim 1, wherein the first contactor is an on-board contactor.

3. The switching power supply according to claim 1, wherein the dc distribution unit further comprises a plurality of circuit protection power down load branches, each circuit protection power down load branch comprises a second circuit breaker, a first end of the second circuit breaker is electrically connected to the output terminal of the rectifying unit, a second end of the second circuit breaker is a load output terminal, and a second end of the second circuit breaker is electrically connected to the control unit.

4. The switching power supply according to claim 2 or 3, wherein the dc power distribution unit further comprises a backup power supply branch, the backup power supply branch comprises a battery pack, a third circuit breaker and a second contactor, an anode of the battery pack is electrically connected to an anode output terminal of the rectifying unit, a cathode of the battery pack is connected in series to a first end of the third circuit breaker, a second end of the third circuit breaker is connected in series to a first end of the second contactor, a second end of the second contactor is electrically connected to a cathode output terminal of the rectifying unit, and a first end of the third circuit breaker is further electrically connected to the control unit.

5. The switching power supply according to claim 3, wherein a shunt is further connected in series in each of the under-load electrical shunt, the under-voltage electrical load shunt, and the backup power supply shunt, and the shunt is further electrically connected to the control unit.

6. The switching power supply according to claim 1, wherein the ac power distribution unit includes an input lightning protection circuit, and an output lightning protection circuit is provided at an output end of the rectifying unit.

7. The switching power supply according to claim 1, wherein the first circuit breaker, the second circuit breaker and the third circuit breaker are 1U pluggable circuit breakers, and the second contactor is a 1U magnetically held contactor.

8. The switching power supply according to claim 6, further comprising a case, wherein the case is divided into an upper layer and a lower layer, the dc distribution unit and the control unit are located at an upper layer of the case, the dc distribution unit and the control unit are disposed adjacent to each other in the left-right direction, the ac distribution unit and the rectifying unit are disposed at a lower layer of the case, and the ac distribution unit and the rectifying unit are disposed adjacent to each other in the left-right direction.

9. The switching power supply according to claim 8, wherein the ac power distribution unit is located in a space of 1U × 2U on the left side of the lower layer inside the cabinet, and the dc power distribution unit is located in a space of 19 inches on the left side of the upper layer inside the cabinet.

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