WO2012083746A1 - 一种无线分布式基站供电*** - Google Patents

一种无线分布式基站供电*** Download PDF

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Publication number
WO2012083746A1
WO2012083746A1 PCT/CN2011/080576 CN2011080576W WO2012083746A1 WO 2012083746 A1 WO2012083746 A1 WO 2012083746A1 CN 2011080576 W CN2011080576 W CN 2011080576W WO 2012083746 A1 WO2012083746 A1 WO 2012083746A1
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WO
WIPO (PCT)
Prior art keywords
switch
boosting
voltage
capacitor
circuit
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PCT/CN2011/080576
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English (en)
French (fr)
Inventor
唐倬
曹喜
莫少勇
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华为技术有限公司
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2011/080576 priority Critical patent/WO2012083746A1/zh
Priority to CN2011800024157A priority patent/CN102439835A/zh
Publication of WO2012083746A1 publication Critical patent/WO2012083746A1/zh

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/08—Three-wire systems; Systems having more than three wires
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to a wireless distributed base station power supply system.
  • the power supply needs to be remotely transmitted to the RRU (Remote Radio Unit) to supply power thereto.
  • RRU Remote Radio Unit
  • the existing wireless distributed base station power supply system includes: a battery, an AC to DC converter, a bus bar, a power distribution unit for distributing power, a remote cable, and an RRU, wherein the battery pool and the AC to DC The converter is connected in parallel through the input end of the bus bar, and the output end of the bus bar is connected to the input end of the switch in the power distribution unit, the output end of the switch is connected to the input end of the cable, and the output end of the cable is connected to the RRU.
  • the AC power When the AC power is normal, the AC power is converted to a DC output by a converter that is AC-to-DC.
  • the RRU is supplied to the RRU through the switch and the remote cable, and the battery is also floated.
  • the AC to DC converter When the power is cut off, the AC to DC converter is turned off, and the battery is discharged to supply power to the RRU.
  • the output voltage of the battery terminal When the battery is discharged for a period of time, the output voltage of the battery terminal gradually decreases. When the battery terminal voltage drops to 43V, the system will cut off the battery discharge circuit and stop supplying power to the RRU.
  • the present invention provides a wireless distributed solution in order to solve the problem that the cable cross-section becomes large due to the low battery voltage, the height of the power distribution unit is increased, the distance of the cable is limited, and the RRU life is reduced.
  • Base station power supply system The technical solution is as follows:
  • a wireless distributed base station power supply system comprising: a battery, an AC to DC converter, a bus bar, a power distribution unit for distributing electrical energy, a remote cable, and a load;
  • the power distribution unit includes: a booster circuit and a first switch;
  • the battery and the AC to DC converter are connected in parallel through an input end of the bus bar, an output end of the bus bar is connected to an input end of the boost circuit, and an output end of the boost circuit is connected to the An input end of the first switch, an output end of the first switch is connected to an input end of the remote cable, an output end of the remote cable is connected to the load; and the boost circuit has a boosting a fixed point, when the voltage of the bus bar is higher than or equal to the boosting set point, the boosting circuit is inactive, in a through state, when the voltage of the bus bar is lower than the boosting set point, The boost circuit begins to operate.
  • the boosting circuit By adding a boosting circuit to the wireless distributed base station power supply system, when the battery voltage becomes lower and the voltage of the bus bar is lower than a certain value, the boosting circuit starts to work to increase the voltage of the bus bar to a set value, thereby ensuring the bus bar.
  • the output voltage is not less than the system setting value, which reduces the cable section and the height dimension of the power distribution unit, reduces the material cost of the cable, increases the cable's distance, and extends the RRU life.
  • FIG. 1 is a schematic structural diagram of a wireless distributed base station power supply system according to an embodiment of the present invention
  • FIG. 2 is another schematic structural diagram of a wireless distributed base station power supply system according to an embodiment of the present invention
  • FIG. 3 is another schematic structural diagram of a wireless distributed base station power supply system according to an embodiment of the present invention.
  • an embodiment of the present invention provides a wireless distributed base station power supply system, including: a battery 101, an AC to DC converter 102, a bus bar 103, a power distribution unit 104 for distributing power, and a remote
  • the power distribution unit 104 includes: a booster circuit 108 and a first switch 106;
  • the battery 101 and the AC to DC converter 102 are connected in parallel through the input terminal of the bus bar 103, and the output of the bus bar 103 is connected.
  • the output end of the boosting circuit 108 is connected to the input end of the first switch 106, the output end of the first switch 106 is connected to the input end of the remote cable 105, and the output end of the remote cable 105 is connected.
  • the boosting circuit 108 has a boosting setting point. When the voltage of the bus bar 103 is higher than or equal to the boosting set point, the boosting circuit 108 does not operate, and is in a through state, when the voltage of the bus bar 103 is lower than the rise. When the fixed point is pressed, the booster circuit 108 starts operating.
  • n loads 0 is a natural number of ⁇ 3 ⁇ 4, and the output of the bus bar 103 is allocated as n branches, and each branch includes a boost circuit, a first switch, and a remote line. Cable, and load, see Figure 1 for the connections of the components in each branch.
  • the wireless distributed base station power supply system may further include: a second switch 109, the second switch 109 is connected in parallel with the boosting circuit 108; when the voltage of the bus bar 103 is higher than or equal to the boosting set point, the second The switch 109 is closed, the boosting circuit 108 is inactive, and is in a through state. When the voltage of the bus bar 103 is lower than the boosting set point, the second switch 109 is turned off, and the boosting circuit 108 starts operating.
  • n is a natural number
  • the output of the bus bar is allocated as n branches, each of which includes a boost circuit, a first switch, a remote cable, and a load.
  • the second switch the connection of each component in each branch is shown in Figure 2.
  • the first switch 106 or the second switch 109 may be an electrical device circuit breaker, or may be a MOSTEKMetal Oxid Semiconductor Field Effect Transistor, an IGBT (Insulated Gate Bipolar Transistor), an insulated gate bipolar transistor. ) Power semiconductor switching elements.
  • each branch includes a first switch 106, and the first of each path i Switch 106 is shown as QFi.
  • first switch 106 of the first branch is represented as QF1
  • first switch 106 of the nth branch is represented as QFn.
  • each branch includes a first switch 106 and a second switch 109, and the first of each branch i
  • a switch 106 is shown as QFi
  • a second switch 109 in each branch i is represented as Si.
  • the second switch 109 of the first branch is represented as S1
  • the second switch 109 of the nth branch is represented as Sn.
  • the load 107 can be a radio remote unit RRU, and an input capacitor of the RRU is connected to an electrolytic capacitor. Need to explain Yes, if the wireless distributed base station power supply system has n branches, that is, there are n ⁇ (ie, RRUU R rats..., RRUn), there are corresponding n electrolytic capacitors (Cl, C-2, ..., Cn).
  • the booster circuit 108 may be a circuit having a boost function such as B00ST, BUCK-BOOST, CUK, etc., and the specific implementation circuit is not limited in this embodiment.
  • the booster circuit 108 is a BOOST circuit
  • the booster circuit 108 is composed of an inductor L, a first MOSFET tube Q, a first diode D, and a first capacitor C; one end of the inductor L and the source of the first MOSFET tube Q
  • the other end of the inductor L is the negative input terminal of the booster circuit 108, the source of the first MOSFET tube Q is the positive input terminal of the booster circuit 108, the source of the first MOSFET tube Q and the first diode D
  • the negative pole is connected, the drain of the first MOSFET tube Q is connected to one end of the first capacitor C, the other end of the first capacitor C is connected to the anode of the first diode D, and the two ends of the first capacitor C are boost circuits The output of 108.
  • each branch includes a boosting circuit 108, and the composition of the boosting circuit 108 in each of the paths i is represented as an inductance Li,
  • the first MOSFET tube Qi, the first diode Di, and the first capacitor Ci for example, for the first branch, the composition of the boosting circuit 108 is represented as an inductor L1, a first MOSFET tube Q1, and a first diode D1. And a first capacitor C1.
  • the composition of the boosting circuit 108 is represented by an inductor Ln, a first MOSFET tube Qn, a first diode Dn, and a first capacitor Cn.
  • FIG. 3 shows n branches.
  • the combination of the boosting circuit 108 and the first switch 106 may further include: a second capacitor C', a second diode D', and a varistor RV; the first switch 106 is a second MOSFET tube Q'
  • the circuit structure of the booster circuit 108 and the first switch 106 is integrated as shown in FIG.
  • one end of the second capacitor C' is connected to the cathode of the second diode D', and the other end of the second capacitor C' is The source of the second MOSFET tube Q' is connected, the drain of the second MOSFET tube Q' is connected to the anode of the second diode D', and the cathode of the second diode D' is connected to the anode input terminal of the booster circuit 108.
  • the anode of the second diode D' is connected to the negative input terminal of the booster circuit 108, and the output terminal of the booster circuit 108 is connected to the varistor RV.
  • the storage medium mentioned may be a read only memory, a magnetic disk or an optical disk or the like.
  • the above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., which are within the spirit and scope of the present invention, should be included in the protection of the present invention. Within the scope.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

本发明提供一种无线分布式基站供电***，涉及无线通信领域，包括：电池、交流到直流的变换器、汇流母线、用于分配电能的配电单元、拉远线缆、以及负载；配电单元包括升压电路和第一开关；电池与变换器通过汇流母线的输入端并联，汇流母线的输出端连接升压电路的输入端，升压电路的输出端连接第一开关的输入端，第一开关的输出端连接拉远线缆的输入端，拉远线缆的输出端连接负载；升压电路具有一升压整定点，当汇流母线的电压高于或等于升压整定点时，升压电路不工作，当其低于升压整定点时，升压电路开始工作。本发明通过上述方案，在电池供电情况下，减小线缆截面和配电单元高度，降低线缆物料成本，提高线缆拉远距离，延长RRU寿命。

Description

一种无线分布式基站供电*** 技术领域
本发明涉及无线通信领域， 特别涉及一种无线分布式基站供电***。 背景技术 说
在无线分布式基站供电***中， 电源需要远距离传输给 RRU ( Remote Radio Unit , 射 频拉远单元）， 为其供电。
现有的无线分布式基站供电***包括： 电池、 交流到直流的变换器、 汇流母线、 用于 分配电能的配电单元、 拉远线缆、 以及 RRU， 其中， 电书池与交流到直流的变换器通过汇流母 线的输入端并联， 汇流母线的输出端连接配电单元中开关的输入端， 开关的输出端连接拉 远线缆的输入端， 拉远线缆的输出端连接 RRU。
在交流电正常的情况下， 交流电经过交流到直流的变换器形成 -53V直流输出， 经过开 关和拉远线缆给 RRU供电， 同时也对电池进行浮充电。 当停电后， 交流到直流的变换器关 闭， 由电池放电给 RRU进行供电。 当电池经过一段时间的放电， 电池端输出电压逐渐降低， 当电池端电压下降到 43V时， ***为保护电池会将电池放电回路切断， 停止对 RRU供电。
由于汇流母线存在的最低输出电压 U¾IN为电池下电时的电池端电压 43V，而 RRU的最低 输入电压 UbMIN 为一个固定值， 通常为 36V， 因此， 在拉远线缆上允许的最大压降为 A UMX= Ua-Ub=7V„ 以铜质导线为例， R=2 X L/57S= A U X Ub/P。 由此可以看出： （1 )在拉远距离（L) 和 RRU功率 (P)保持不变情况下， 由于电池端输出电压逐渐降低， 致使 A U减小， 使得线缆 截面变大， 物料成本增高， 并且， 随着线缆截面增大， 配电单元的高度尺寸也要增加。 （2 ) 在 RRU功率 (Ρ)保持不变情况下， 受最大压降为 A U x=7V的限制， 线缆的拉远距离 (L)也受 到限制。 （3 ) 由于 RRU输入侧存在电解电容， 在电池供电情况下电池电压不断变低， 拉远 线缆上的电流不断增大， 而引起线缆上的压降 A U不断增大， RRU107 的工作模式是在不发 射功率 （静态） 和发射功率 （动态） 之间不停地切换， 而且频率较高， 导致线缆上的电流 不断快速变化， 使得拉远线缆上的压降也不断波动， 从而在电解电容上造成纹波电流， 降 低电解电容的寿命和 RRU的使用寿命。
针对电池供电情况下， 由于电池电压变低引起的线缆截面变大、 配电单元高度尺寸增 力口、 线缆拉远距离受到限制、 以及 RRU寿命降低等问题， 现有技术还没有相应的解决方案。 发明内容
为了解决由于电池电压变低引起的的线缆截面变大、 配电单元高度尺寸增加、 线缆的 拉远距离受到限制、 以及 RRU寿命降低等问题， 本发明实施例提供了一种无线分布式基站 供电***。 所述技术方案如下：
一种无线分布式基站供电***， 所述***包括： 电池、 交流到直流的变换器、 汇流母 线、 用于分配电能的配电单元、 拉远线缆、 以及负载； 所述配电单元包括： 升压电路和第 一开关；
所述电池与所述交流到直流的变换器通过所述汇流母线的输入端并联， 所述汇流母线 的输出端连接所述升压电路的输入端， 所述升压电路的输出端连接所述第一开关的输入端， 所述第一开关的输出端连接所述拉远线缆的输入端， 所述拉远线缆的输出端连接所述负载; 所述升压电路具有一升压整定点， 当所述汇流母线的电压高于或等于所述升压整定点 时， 所述升压电路不工作， 处于直通状态， 当所述汇流母线的电压低于所述升压整定点时， 所述升压电路开始工作。
本发明实施例提供的技术方案的有益效果是：
通过在无线分布式基站供电***中增加升压电路， 当电池电压变低致使汇流母线的电 压低于一定值时， 升压电路开始工作提高汇流母线的电压到到整定值， 从而保证汇流母线 的输出电压在任何情况下都不小于***整定值， 减小了线缆截面和配电单元的高度尺寸， 降低了线缆的物料成本， 提高了线缆的拉远距离， 并且延长了 RRU寿命。 附图说明
为了更清楚地说明本发明实施例中的技术方案， 下面将对实施例描述中所需要使用的 附图作简单地介绍， 显而易见地， 下面描述中的附图仅仅是本发明的一些实施例， 对于本 领域普通技术人员来讲， 在不付出创造性劳动的前提下， 还可以根据这些附图获得其他的 附图。
图 1是本发明实施例提供的一种无线分布式基站供电***的结构示意图；
图 2是本发明实施例提供的一种无线分布式基站供电***的另一结构示意图； 图 3是本发明实施例提供的一种无线分布式基站供电***的另一结构示意图； 图 4是本发明实施例提供的升压电路和第一开关集成的电路结构示意图。 具体实施方式
为使本发明的目的、 技术方案和优点更加清楚， 下面将结合附图对本发明实施方式作 进一步地详细描述。
参见图 1，本发明实施例提供了一种无线分布式基站供电***，该***包括： 电池 101、 交流到直流的变换器 102、 汇流母线 103、 用于分配电能的配电单元 104、 拉远线缆 105、 以及负载 107; 配电单元 104包括： 升压电路 108和第一开关 106; 电池 101与交流到直流 的变换器 102通过汇流母线 103的输入端并联， 汇流母线 103的输出端连接升压电路 108 的输入端， 升压电路 108的输出端连接第一开关 106的输入端， 第一开关 106的输出端连 接拉远线缆 105的输入端， 拉远线缆 105的输出端连接负载 107; 升压电路 108具有一升压 整定点， 当汇流母线 103的电压高于或等于升压整定点时， 升压电路 108不工作， 处于直 通状态， 当汇流母线 103的电压低于升压整定点时， 升压电路 108开始工作。
需要说明的是， 当为 n个负载供电时， 0为≡¾ 1自然数， 汇流母线 103的输出端分配成 n个支路， 每个支路都包括升压电路、 第一开关、 拉远线缆、 以及负载， 每个支路中各部件 的连接参见图 1。
参见图 2，进一步，无线分布式基站供电***还可以包括：第二开关 109，第二开关 109 与升压电路 108并联； 当汇流母线 103的电压高于或等于升压整定点时， 第二开关 109闭 合， 升压电路 108不工作， 处于直通状态， 当汇流母线 103的电压低于升压整定点时， 第 二开关 109断开， 升压电路 108开始工作。
需要说明的是， 当为 n个负载供电时， n为 1自然数， 汇流母线的输出端分配成 n个 支路， 每个支路都包括升压电路、 第一开关、 拉远线缆、 负载、 以及第二开关， 每个支路 中各部件的连接参见图 2。
其中，第一开关 106或第二开关 109可以是电器件断路器，也可以是 MOSFEKMetal Oxid Semiconductor Field Effect Transistor , 金属氧化物半导体场效应晶体管）、 IGBT (Insulated Gate Bipolar Transistor, 绝缘栅双极型晶体管）等功率半导体开关元件。
需要说明的是， 如果无线分布式基站供电***有 n个支路， 对于图 1所示的实施例， 则每一支路中都包括一第一开关 106， 每一支路 i中的第一开关 106表示为 QFi， 例如， 第 1支路的第一开关 106表示为 QF1， 第 n支路的第一开关 106表示为 QFn。 如果无线分布式 基站供电***有 n个支路， 对于图 2所示的实施例， 则每一支路中都包括一第一开关 106 和一第二开关 109，每一支路 i中的第一开关 106表示为 QFi，每一支路 i中的第二开关 109 表示为 Si，例如，第 1支路的第二开关 109表示为 S1，第 n支路的第二开关 109表示为 Sn。
其中， 负载 107可以为射频拉远单元 RRU， RRU的输入侧连接一电解电容。 需要说明的 是，如果无线分布式基站供电***有 n个支路，也即有 n个■ (即 RRUU R鼠…、 RRUn), 则相应有 n个电解电容 （C-l、 C-2、 …、 C-n)。
其中， 升压电路 108可以是 B00ST、 BUCK-BOOST, CUK等具有升压功能的电路， 本实施 例并不限定其具体的实现电路。 当升压电路 108为 BOOST电路时， 升压电路 108由电感 L、 第一 M0SFET管 Q、 第一二极管 D、 以及第一电容 C组成； 电感 L的一端与第一 M0SFET管 Q 的源极相连， 电感 L的另一端为升压电路 108的负极输入端， 第一 M0SFET管 Q的源极为升 压电路 108的正极输入端，第一 M0SFET管 Q的源极与第一二极管 D的负极相连，第一 M0SFET 管 Q的漏极与第一电容 C的一端相连， 第一电容 C的另一端与第一二极管 D的正极相连， 第一电容 C的两端为升压电路 108的输出端。
需要说明的是， 如果无线分布式基站供电***有 n个支路， 则每一支路中都包括一升 压电路 108， 每一支路 i中的升压电路 108的组成表示为电感 Li、第一 M0SFET管 Qi、第一 二极管 Di、 以及第一电容 Ci， 例如， 对于第 1支路， 升压电路 108的组成表示为电感 Ll、 第一 M0SFET管 Ql、 第一二极管 Dl、 以及第一电容 Cl， 对于第 n支路， 升压电路 108的组 成表示为电感 Ln、 第一 M0SFET管 Qn、 第一二极管 Dn、 以及第一电容 Cn
根据负载 107和升压电路 108结构的描述， 无线分布式基站供电***的具体结构参见 图 3。 需要说明的是， 图 3示出了 n个支路。
进一步的， 升压电路 108与第一开关 106的组合形态还可以包括： 第二电容 C'、 第二 二极管 D'、 以及压敏电阻 RV; 以第一开关 106为一第二 M0SFET管 Q' 为例， 升压电路 108 和第一开关 106集成的电路结构参见图 4: 第二电容 C' 的一端与第二二极管 D' 的负极相 连， 第二电容 C' 的另一端与第二 M0SFET管 Q' 的源极相连， 第二 M0SFET管 Q' 的漏极与 第二二极管 D' 正极相连， 第二二极管 D' 的负极与升压电路 108的正极输入端相连， 第二 二极管 D' 的正极与升压电路 108的负极输入端相连， 升压电路 108的输出端与压敏电阻 RV相连。
本实施例通过升压电路， 配电单元的最低输出电压 Uc被大幅提升， 允许在拉远线缆上 的最大压降为 A U=Uc - UbMIN也大大增加， 以铜质导线为例， R=2 X L/57S= A U X Ub/P， 由此 可见： （ 1 ) 在拉远距离 (L)和 RRU功率 (P)保持不变的情况下， Δ U增加可使电缆截面积 (S) 减少， 配电单元的高度尺寸也相应减小， 从而节省大量的物料成本。 （2)在电缆截面积 (S) 和 RRU功率 (P)保持不变的情况下， A U增加可使电缆的拉远距离 (L)增加， 提高了线缆的拉 远距离。 （3) 由于配电单元的最低输出电压 Uc 被大幅提升， RRU输入电压 Ub也被大幅提 升， 在拉远距离 (L)、 电缆截面积 (S)和 RRU功率 (P)不变情况下， A U变小， 使得 RRU在切 换工作模式时拉远线缆上的电压波动也变小， 从而减少流入电解电容的纹波电流， 提高了 电解电容的寿命， 相应的提高了 RRU的使用寿命。 本领域普通技术人员可以理解实现上述实施例的全部或部分步骤可以通过硬件来完 成， 也可以通过程序来指令相关的硬件完成， 所述的程序可以存储于一种计算机可读存储 介质中， 上述提到的存储介质可以是只读存储器， 磁盘或光盘等。 以上所述仅为本发明的较佳实施例， 并不用以限制本发明， 凡在本发明的精神和原则 之内， 所作的任何修改、 等同替换、 改进等， 均应包含在本发明的保护范围之内。

Claims

权 利 要 求 书
1、 一种无线分布式基站供电***， 其特征在于， 所述***包括： 电池、 交流到直流的变 换器、 汇流母线、 用于分配电能的配电单元、 拉远线缆、 以及负载； 所述配电单元包括： 升 压电路和第一开关；
所述电池与所述交流到直流的变换器通过所述汇流母线的输入端并联， 所述汇流母线的 输出端连接所述升压电路的输入端， 所述升压电路的输出端连接所述第一开关的输入端， 所 述第一开关的输出端连接所述拉远线缆的输入端， 所述拉远线缆的输出端连接所述负载； 所述升压电路具有一升压整定点，当所述汇流母线的电压高于或等于所述升压整定点时， 所述升压电路不工作， 处于直通状态， 当所述汇流母线的电压低于所述升压整定点时， 所述 升压电路开始工作。
2、 根据权利要求 1所述的***， 其特征在于， 所述配电单元还包括： 第二开关， 所述第 二开关与所述升压电路并联；
当所述汇流母线的电压高于或等于所述升压整定点时， 所述第二开关闭合， 当所述汇流 母线的电压低于所述升压整定点时， 所述第二开关断开。
3、根据权利要求 1或 2所述的***， 其特征在于， 所述升压电路由电感 L、第一 MOSFET 管、 第一二极管、 以及第一电容组成；
所述电感 L的一端与所述第一 MOSFET管的源极相连，所述电感 L的另一端为所述升压电 路的负极输入端，所述第一 MOSFET管的源极为所述升压电路的正极输入端，所述第一 MOSFET 管的源极与所述第一二极管的负极相连，所述第一 MOSFET管的漏极与所述第一电容的一端相 连， 所述第一电容的另一端与所述第一二极管的正极相连， 所述第一电容的两端为所述升压 电路的输出端。
4、 根据权利要求 3所述的***， 其特征在于， 所述第一开关为一第二 MOSFET管， 所述 ***还包括： 第二电容、 第二二极管、 以及压敏电阻；
所述第二电容的一端与所述第二二极管的负极相连， 所述第二电容的另一端与所述第二 MOSFET管的源极相连， 所述第二 MOSFET管的漏极与所述第二二极管正极相连， 第二二极管 的负极与所述升压电路的正极输入端相连， 所述第二二极管的正极与所述升压电路的负极输 入端相连， 所述升压电路的输出端与所述压敏电阻相连。
5、根据权利要求 1所述的***， 其特征在于， 所述负载为射频拉远单元， 所述射频拉远 单元的输入侧连接一电解电容。
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