KR200482636Y1 - A POWER SUPPLY DEVICE FOR Remote Radio Head - Google Patents

Abstract

The present invention relates to a power supply for an RRH, and in accordance with the present invention, it is provided in an RRH 110, receives a commercial AC power, converts it into a DC voltage and a current for operating the RRH main body 114, 114 to an AC / DC power module 112; An AC / DC charger 122 for receiving a commercial AC power and converting it into an input voltage and a current of the rechargeable battery 124 and outputting the converted input voltage and current; DC power supply 112 to the RRH main body 114 when the supply of DC power from the AC / DC power module 112 to the RRH main body 114 is interrupted, And a rechargeable battery 124 for supplying an emergency power source. This has the advantage of significantly lowering the cost of the product and improving the installation workability.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a power supply for an RRH,

The present invention relates to a power supply for an RRH, and more particularly, to a power supply for an RRH that is suitable for significantly lowering the cost of a product and improving installation workability.

In the LTE-A system, which is a standard of the next generation mobile communication system, Coordinated Multi Point (CoMP) method and Multi User-MIMO (MU-MIMO) method, which are not supported in the existing standard, are expected to be supported.

Here, the CoMP system refers to a system in which two or more base stations or cells cooperate with each other to improve communication performance between a terminal and a base station (cell or sector) in a shadow area. The CoMP scheme can be classified into cooperative MIMO type joint processing (CoMP-JP: CoMP-Joint Processing) and CoMP-Coordinated Scheduling / beamforming (CoMP-CS)

In a joint processing (CoMP-JP) scheme, a UE can instantaneously receive data simultaneously from each base station performing CoMP and can combine received signals from each base station to improve reception performance.

In contrast, in the cooperative scheduling / beamforming scheme (CoMP-CS), the UE can instantaneously receive data through one base station through beamforming.

In the MU-MIMO technique, a base station allocates each antenna resource to another UE, and selects and schedules a UE capable of a high data rate for each antenna. This MU-MIMO scheme is a technique for improving system throughput.

On the other hand, the widespread use of portable devices such as smart phones has led to a rapid increase in the amount of wireless data, which has led to the need to upgrade the mobile communication network, which has been optimized mainly for voice services, around data services.

In the process of reconfiguring the wireless network, an additional base station (base station) is required, which requires a great deal of resources.

In order to solve these problems, the RRH (Remote Radio Head) is one of the methods for providing data high-speed wireless data service while minimizing the cost required for upgrading the communication network.

FIG. 1 shows a block diagram of a conventional power supply for RRH.

1, the conventional RRH power supply device includes a rectifier box 22 for rectifying commercial AC power to a DC voltage (DC 48 V voltage in the case of the RRH of the currently implemented communication system) A battery box 24 charged with 48 V DC power outputted from the rectifier box 22 and used as an emergency power source of the RRH during a power failure and a DC voltage output from the rectifier box 22 DC converter 11 that converts the RRH voltage V to an RRH operating voltage (DC 27 V or DC 28 V in the case of the RRH currently installed in the field) and supplies it to the RRH main body 12 (i.e., the RRH system itself) do.

The rectifier box 22 and the battery box 24 are provided in the housing 30 and the DC / DC converter 11 is provided in the RRH 10.

However, the conventional power supply for RRH has the following problems.

First, in the prior art, the rectifier box 22 is also used for charging the battery box 24, which requires a very large capacity, that is, a rectifier of a large capacity. As a result, There was a problem.

Secondly, since the rectifier box 22 employed in the prior art is a large-capacity rectifier, it is very heavy, so it is difficult for the operator to carry heavy Rectifier box when installing the RRH, so that the RRH installation workability is poor, There was a problem that the installation work space was wide because it was very large.

Thirdly, since the battery box 24 was supplied with current from the rectifier box 22, the battery box 24 and the rectifier box 22 had to be provided in one closed housing 30, The hydrogen gas generated in the rectifier box 22 is exploded by an arc generated in the rectifier box 22 having a large capacity.

Fourthly, a rectifier box 22 for charging the battery box 24 must be additionally provided. The DC / DC converter 11 for reducing the DC voltage output from the rectifier box 22 is provided with two- There is a problem that efficiency is lowered as a whole.

Fifth, since the two-stage conversion of the rectifier box 22 for charging the battery box 24 and the DC / DC converter for reducing the voltage output from the rectifier box 22 is required, the overall system reliability (MTBF) There was a problem of deterioration.

Sixth, since the rectifier box 22 must be installed in a one-to-one correspondence with the RRH 10, it is impossible to install a plurality of RRHs in one battery box 24.

1. Patent Document: Japanese Patent Application Laid-Open No. 10-2014-0054082 (Publication date: 2014.05.08) 2. Patent Literature: Laid-open Patent Publication No. 10-2013-0131183 (Published date: December 3, 2013)

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a power supply for RRH,

First, it does not adopt the rectifier box used in the power supply of the conventional RRH, but has the AC / DC power module in place of the conventional DC / DC converter and charges the rechargeable battery by the low cost AC / DC charger So that the overall cost of the power supply can be significantly lowered because it is not necessary to employ an expensive rectifier box,

Secondly, since a very light and small size charger and AC / DC power module can be installed without installing a conventional heavy rectifier box, it is possible to install the entire power supply device easily, simply and quickly, And to minimize the space occupied by the installation,

Third, there is no need to incorporate a rectifier box in a battery enclosure in which a battery is installed, and only a small DC charger can be provided. Thus, explosion of a battery enclosure can be prevented from occurring,

Fourth, it is possible to supply the DC operation voltage and current to the RRH with only one configuration of the AC / DC power module without adopting the rectifier box and DC / DC converter employed in the power supply of the conventional RRH, thereby increasing the efficiency And,

Fifth, DC power can be supplied by only one AC / DC power module without the two-step conversion of the rectifier box for charging the battery box and the DC / DC converter for reducing the voltage output from the rectifier box as in the prior art (MTBF) of the entire system by simplifying the power supply,

Sixth, it is an object of the present invention to provide a power supply for RRH which is suitable for installing a plurality of RRHs in one rechargeable battery by varying the capacity of rechargeable batteries.

In order to achieve the above object, the power supply for RRH, which is provided in the RRH, includes an AC / DC converter that receives a commercial AC power, converts it into a DC voltage and current for operating the RRH main body, Power module; An AC / DC charger that receives a commercial AC power and converts the input AC voltage into an input voltage and a current of the rechargeable battery; And a rechargeable battery for receiving and charging a charging current output from the AC / DC recharger and supplying emergency power to the RRH body when DC power supply to the RRH body is interrupted in the AC / DC power module .

The power supply for the RRH further includes a DC / DC converter provided between the rechargeable battery and the RRH main body for down-converting or boosting an input voltage applied from the rechargeable battery and outputting it to the RRH main body .

The power supply for the RRH includes a first switch provided at an output terminal of the rechargeable battery to intermittently charge the recharge power supplied from the rechargeable battery to the RRH main body, and a second switch provided at an output terminal of the DC / And a second switch for interrupting the charging power output from the converter to the RRH main body.

The power supply for the RRH according to the present invention is characterized in that the AC / DC charger and the DC / DC converter are provided together in a battery housing storing the rechargeable battery.

The power supply for RRH, which is the present invention having the above-described configuration, has the following effects.

First, it does not adopt the rectifier box used in the power supply of the conventional RRH, but has the AC / DC power module in place of the conventional DC / DC converter and charges the rechargeable battery by the low cost AC / DC charger It is not necessary to adopt an expensive rectifier box, and as a result, the overall cost of the power supply device can be remarkably reduced.

Second, since it is unnecessary to install a conventional heavy rectifier box, it is possible to install an AC / DC power module and install the entire power supply easily, because a very light and small size charger (DC charger itself is very small and light in comparison with a rectifier box) There is an effect that it can be carried out easily and quickly, the installation workability can be improved, and the installation occupied space can be minimized.

Third, there is no need to incorporate a rectifier box as in a conventional battery housing, and only a small DC charger is required. Therefore, there is an effect of preventing the explosion of the battery housing from occurring.

Fourth, because it is possible to supply the DC operating voltage and current to the RRH with only one configuration of the AC / DC power module without adopting the rectifier box and DC / DC converter employed in the power supply of the conventional RRH, There is an effect that the efficiency can be increased.

Fifth, DC power can be supplied by only one AC / DC power module without the two-step conversion of the rectifier box for charging the battery box and the DC / DC converter for reducing the voltage output from the rectifier box as in the prior art So that the reliability (MTBF) of the entire system can be improved.

Sixth, there is an effect that a plurality of RRHs can be installed in one rechargeable battery by varying the capacity of rechargeable batteries.

1 is a block diagram of a conventional RRH power supply apparatus.
2 is a block diagram of a power supply for RRH according to an embodiment of the present invention.

Hereinafter, a preferred embodiment of the power supply for RRH according to the present invention will be described in detail with reference to the accompanying drawings.

As shown in the figure, the power supply for RRH according to an embodiment of the present invention includes an AC / DC power module 112, an AC / DC charger 122, and a rechargeable battery 124 .

The AC / DC power module 112 is provided in the RRH 110 and supplies the rated power to the RRH main body 114, that is, the RRH system. The AC / DC power module 112 receives the commercial AC power, (For example, 27 V or 47 V) and a current (for example, 13 A) capable of operating the RRH main body 114 and outputs the converted power to the RRH main body 114.

The AC / DC power module 112 may be implemented as a single PCB module. The AC / DC power module 112 includes a PFC (Power Factor) circuit unit (not shown) for full-wave rectifying and outputting an AC input and a PFC By controlling the PFC circuit section to follow the waveform of the input voltage by feedforward control of CCM (Continuous Conduction Mode) method connected to the circuit section, the input current waveform becomes sinusoidal type, the power factor is improved, and the PFC circuit section A DC / DC converter (not shown) connected to an output terminal of the PFC circuit unit for converting a DC voltage input from the PFC circuit unit into AC by high frequency switching, (Not shown) for detecting the output voltage from the DC / DC circuit unit, and comparing the output voltage outputted from the DC / DC circuit unit with a preset reference voltage, And a DC / DC PWM control circuit part (not shown) for controlling the AC / DC ratio of the DC / DC circuit part, And a high-speed rectification and filter unit (not shown) for generating a square-wave voltage as a pure DC voltage.

The AC / DC power module 112 may have a full brick size (116.8 mm * 61 mm * 13 mm).

In the conventional case, in order to supply power to the RRH main body, the rectifier box and the DC / DC converter are subjected to a two-stage process. Therefore, when the efficiency of the rectifier box is 90% and the efficiency of the DC / DC converter is 94% The efficiency of the AC / DC power module 112 is 91.5%, so that the efficiency is increased by at least 6% as compared with the conventional case, and the power charge can be saved accordingly It will be.

The AC / DC power module 112 may be replaced with a DC / DC converter located in a conventional RRH.

In addition, there is no need to perform a two-step conversion of the rectifier box for charging the battery box and the DC / DC converter for reducing the voltage output from the rectifier box, It is possible to improve the reliability (MTBF) of the entire system by simplifying the power supply.

The AC / DC charger is configured to charge the rechargeable battery 124. The AC / DC charger receives the commercial AC power and converts it into the input voltage and current of the rechargeable battery 124 and outputs the converted voltage.

Since the AC / DC charger 122 continuously charges the rechargeable battery 124 while supplying power from the commercial AC power source directly to the RRH 110, the capacity of the AC / DC charger 122 is completely independent The capacity is small enough.

Therefore, a DC charger outputting a current in the unit of mmA and a DC voltage in the range of 3 to 6 V suffices, so that the price of the product is significantly lower than that of a conventional rectifier box, so that the price of the RRH power supply as a whole is lowered will be.

In addition, since it is not necessary to install a conventional heavy rectifier box and an AC / DC charger 122 of a very small size and a small size can be installed, there is an advantage that the entire power supply device can be installed easily, The advantage is that it can improve the performance and minimize the space occupied by the installation.

When the DC power supply from the AC / DC power module 112 to the RRH main body 114 is interrupted, the charging battery 124 receives the charging current outputted from the AC / DC charging device 122, And the emergency power source is supplied to the RRH main body 114.

In addition, the rechargeable battery 124 can freely select a voltage.

The rechargeable battery 124 may be installed inside the battery enclosure 130. In this case, it is not necessary to equip the rectifier box having a large volume and weight inside the battery enclosure 130, It is sufficient to reduce the size of the battery housing 130 so that there is no fear of explosion of the battery housing 130 as in the conventional case.

That is, the AC / DC charger 122 and the DC / DC converter 126 are provided together in the battery housing 130 storing the rechargeable battery 124.

Since the commercial AC power source is directly supplied to the RRH 110, the capacity of the rechargeable battery 124 can be changed so that a plurality of RRHs 110 can be connected to one rechargeable battery 124, As shown in FIG.

Specifically, the rechargeable battery 124 branches at the first node N1 between the AC / DC power module 112 and the RRH main body 114 to supply the emergency DC power to the RRH main body 114. [

In the power supply for RRH according to an embodiment of the present invention, an input voltage provided between the rechargeable battery 124 and the RRH main body 114 and supplied from the rechargeable battery 124 is stepped up or boosted, And a DC / DC converter 126 for outputting to the main body 114.

According to this, since a constant voltage can be supplied to the RRH main body 114 in an emergency, there is an advantage that the system of the RRH 110 can be stabilized.

The power supply for RRH according to an embodiment of the present invention is provided with an output terminal of the rechargeable battery 124 and is provided between the second node N2 and the rechargeable battery 124, DC converter 126 is provided between the output terminal of the first node N1 and the output terminal of the DC / DC converter 126. The first switch 124a is connected to the RRH main body 114, And a second switch 126a for interrupting the charging power output to the RRH main body 114. [

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It is self-evident to those who have.

Therefore, the above-described embodiments are to be considered as illustrative rather than restrictive, so that the present invention is not limited to the above description, but may be modified within the scope of the appended claims and equivalents thereof.

110: RRH 112: AC / DC power module
114: RRH main body 122: AC / DC charger
124: rechargeable battery 124a: first switch
126: DC / DC converter 126a: second switch
130: Battery housing N1: First node
N2: second node

Claims (1)

An AC / DC power module 112 provided in the RRH 110 for receiving commercial AC power and converting it into a DC voltage and current for operating the RRH main body 114 and outputting the DC voltage and current to the RRH main body 114,
An AC / DC charger 122 for receiving a commercial AC power and converting it into an input voltage and a current of the rechargeable battery 124 and outputting the converted input voltage and current,
DC power supply 112 to the RRH main body 114 when the supply of DC power from the AC / DC power module 112 to the RRH main body 114 is interrupted, A rechargeable battery 124 for supplying emergency power,
A DC / DC converter 126 provided between the rechargeable battery 124 and the RRH main body 114 for stepping down or boosting the input voltage applied from the rechargeable battery 124 and outputting it to the RRH main body 114 ≪ / RTI >
The rechargeable battery 124 branches from a first node N1 between the AC / DC power module 112 and the RRH main body 114 to supply emergency power to the RRH main body 114,
The AC / DC power module 112 is configured in a full brick size,
And is connected between the second node N2 between the AC / DC charger 122 and the DC / DC converter 126 and the rechargeable battery 124 to charge the rechargeable battery 124 to the RRH body 114 A first switch 124a for interrupting power supply,
A second switch 126a provided between the first node N1 and the output terminal of the DC / DC converter 126 for interrupting the charging power output from the DC / DC converter 126 to the RRH main body 114 ≪ / RTI >
The AC / DC charger 122 and the DC / DC converter 126 are provided together with the battery housing 130 storing the rechargeable battery 124,
The AC / DC power module (112)
A power factor (PFC) circuit section for full-wave rectifying and outputting an AC input,
The PFC circuit section is connected to the PFC circuit section to control the PFC circuit section so as to follow the waveform of the input voltage according to the feed forward control of CCM (Continuous Conduction Mode) A PFC PWM control circuit unit for improving the power factor and controlling the stable output voltage of the PFC circuit unit,
A DC / DC circuit unit connected to an output terminal of the PFC circuit unit to convert a DC voltage input from the PFC circuit unit into AC by high frequency switching,
A DC / DC PWM control circuit part for detecting an output voltage outputted from the DC / DC circuit part and controlling a duty (on-off ratio) of the main switch by comparing the output voltage with a predetermined reference voltage;
And a high-speed rectification and filter unit connected to an output terminal of the DC / DC circuit unit for rectifying a square-wave voltage and generating a rectified square-wave voltage into a pure DC voltage by removing a back electromotive force from the AC voltage of a high- Features a power supply for RRH.

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