KR100913824B1 - Uninterruptible power supply having over-charge prevention function - Google Patents

Uninterruptible power supply having over-charge prevention function Download PDF

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KR100913824B1
KR100913824B1 KR1020070050339A KR20070050339A KR100913824B1 KR 100913824 B1 KR100913824 B1 KR 100913824B1 KR 1020070050339 A KR1020070050339 A KR 1020070050339A KR 20070050339 A KR20070050339 A KR 20070050339A KR 100913824 B1 KR100913824 B1 KR 100913824B1
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charging voltage
storage battery
battery
setting unit
temperature
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KR1020070050339A
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KR20080103262A (en
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김종구
김세환
안양임
이성열
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(주)아이비티
이성열
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    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00302—Overcharge protection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/484—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring electrolyte level, electrolyte density or electrolyte conductivity
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
    • H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
    • H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery
    • 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
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

본 발명은 축전지의 온도 상승에 의한 과충전을 방지하기 위한 과충전 방지기능이 부가된 무정전 전원장치에 관한 것으로서, 축전지를 구비하며, 상용전원라인의 단전시 상기 축전지에 저장된 전력을 부하측에 공급하는 무정전 전원장치에 있어서, 상기 축전지 내부에 설치되어 축전지 내에 수용된 전해액의 높이를 검출하는 레벨센서; 및 상기 축전지의 부동 충전전압을 설정하는 부동 충전전압 설정부와, 상기 부동 충전전압에 비해 상대적으로 낮은 축전지의 충전전압을 설정하는 온도보상 충전전압 설정부와, 상기 레벨센서에 의해 검출된 전해액의 레벨이 기준치 이상으로 상승하면 상기 온도보상 충전전압 설정부로 절체하고 상기 레벨센서에 의해 검출된 전해액의 레벨이 기준치 미만으로 내려가면 상기 부동 충전전압 설정부로 절체하여 축전지에 연결하는 충전모드 절체부를 포함하는 충전장치;를 포함하여 구성된 것을 특징으로 한다.The present invention relates to an uninterruptible power supply with an overcharge protection function for preventing overcharging due to an increase in temperature of a storage battery. An apparatus, comprising: a level sensor installed inside the storage battery to detect a height of an electrolyte contained in the storage battery; And a floating charging voltage setting unit for setting a floating charging voltage of the storage battery, a temperature compensation charging voltage setting unit for setting a charging voltage of a storage battery which is relatively lower than the floating charging voltage, and an electrolyte solution detected by the level sensor. And a charging mode switching unit for switching to the temperature compensation charging voltage setting unit when the level rises above the reference value, and switching to the floating charging voltage setting unit when the level of the electrolyte detected by the level sensor falls below the reference value to connect to the storage battery. Charging device; characterized in that configured to include.

무정전 전원장치, UPS, 축전지, 온도센서, 충전모드 절체부 Uninterruptible power supply, UPS, battery, temperature sensor, charging mode switch

Description

과충전 방지기능이 부가된 무정전 전원장치{Uninterruptible power supply having over-charge prevention function}Uninterruptible power supply having over-charge prevention function

도 1은 본 발명에 따른 무정전 전원장치의 일예를 보인 구성도1 is a configuration diagram showing an example of an uninterruptible power supply according to the present invention

도 2는 본 발명에서 충전모드 절체부의 일예를 보인 회로도2 is a circuit diagram showing an example of a charging mode switching unit in the present invention;

<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for the main parts of the drawings>

10 : 큐비클 12 : 축전지10: cubicle 12: storage battery

14 : 충전장치 20 : 온도센서14: charging device 20: temperature sensor

22 : 레벨센서 24 : 쿨링팬22: level sensor 24: cooling fan

30 : 충전모드 절체부 32 : 균등 충전전압 설정부30: charging mode switching unit 32: equal charging voltage setting unit

34 : 부동 충전전압 설정부 36 : 온도보상 충전전압 설정부34: floating charging voltage setting unit 36: temperature compensation charging voltage setting unit

본 발명은 과충전 방지기능이 부가된 무정전 전원장치에 관한 것으로서, 보다 상세하게는 축전지의 온도 상승에 의한 과충전을 방지하여 축전지의 수명을 보 전할 수 있도록 한 과충전 방지기능이 부가된 무정전 전원장치에 관한 것이다.The present invention relates to an uninterruptible power supply with an overcharge protection function, and more particularly, to an uninterruptible power supply with an overcharge protection function that prevents overcharging due to an increase in temperature of a battery to preserve the life of the battery. will be.

일반적으로, 무정전 전원장치(UPS;Uninterruptible Power Supply)는 상시 전원이 살아있어야 하는 서버장치 혹은 지하철 스크린도어 등의 부하에 무정전으로 전원을 공급하는 장치이다. 통상, 이러한 무정전 전원장치에는 축전지가 설치되며, 축전지에 저장된 전력은 무정전 전원장치에 인입되는 전원라인의 단전시 부하측에 공급된다.In general, an uninterruptible power supply (UPS) is an apparatus for uninterrupted power supply to a load such as a server device or a subway screen door that requires constant power. Typically, such an uninterruptible power supply is provided with a storage battery, the power stored in the battery is supplied to the load side when the power supply line is drawn into the uninterruptible power supply.

종래 무정전 전원장치에서, 축전지는 두 가지 모드로 충전되었다. 일반적으로 축전지는 다수개의 셀을 직렬로 연결한 상태에서 충전전압을 설정하고, 축전지에 흐르는 전류의 변화에 대응하여 축전지의 충전과 방전을 반복하는 부동충전 방식으로 충전된다. 하지만, 이러한 부동충전을 장시간 실시할 경우 셀당 전압차가 발생되므로, 셀당 전압 편차를 다운시키기 위한 목적으로 수개월에 한번씩 균등충전을 실시한다. 균등충전 방식은 부동충전 방식에 비해 높은 셀당 전압을 정해진 시간동안 강제로 인가하여 전체 셀을 균등하게 충전하는 방식으로서, 타이머에 의해 설정된 시간 후에는 균등 충전모드에서 다시 부동 충전모드로 복귀하여 축전지를 충전하게 된다. 예컨대, 부동충전 방식에서 셀당 충전전압이 대략 1.34V/Cell로 설정됨에 비해, 균등충전 방식에서는 셀당 충전전압이 대략 1.42V/Cell로 설정된다.In conventional uninterruptible power supplies, the batteries have been charged in two modes. In general, a battery is charged by a floating charging method of setting a charging voltage in a state in which a plurality of cells are connected in series, and repeating charging and discharging of the battery in response to a change in current flowing through the battery. However, when the floating charge is performed for a long time, a voltage difference is generated per cell, and thus, an equal charge is performed every few months for the purpose of reducing the voltage variation per cell. The equal charging method is to charge the entire cell evenly by forcibly applying a high voltage per cell for a predetermined time compared to the floating charging method.After the time set by the timer, the equal charging mode returns to the floating charging mode and returns to the floating charging mode. Will charge. For example, in the floating charging method, the charging voltage per cell is set to about 1.34 V / Cell, whereas in the equal charging method, the charging voltage per cell is set to about 1.42 V / Cell.

그러나 부동 충전모드에서 축전지를 충전하는 중에, 주변의 온도 상승 또는 전해액의 교체 지연 등에 의해 축전지의 온도가 상승하는 경우, 각 셀의 충전전류 가 상승하고, 이에 따라 충전전압이 하락하면서 이를 보상하기 위해 축전지가 과충전되는 경우가 빈번히 발생되고 있다. 이러한 축전지의 과충전은 축전지의 수명을 단축시키는 가장 큰 원인이 되며, 예기치 못한 축전지의 수명 단축으로 인해 무정전 전원공급이 이루어지지 않는 등의 문제점으로 이어진다.However, when charging the battery in the floating charging mode, when the temperature of the battery rises due to a rise in the ambient temperature or a delay in replacement of the electrolyte, the charging current of each cell rises, thereby reducing the charging voltage to compensate for this. Frequently, the battery is overcharged. The overcharging of the battery is the biggest cause of shortening the life of the battery, leading to problems such as uninterruptible power supply due to unexpected shortening of the battery life.

본 발명은 상기와 같은 문제점을 해결하기 위하여 제안된 것으로서, 무정전 전원장치에 있어 축전지의 온도 상승을 검출하여 축전지의 부동 충전전압을 강제로 다운시킴으로써, 축전지의 과충전을 방지하고 축전지의 수명을 보전하여, 예기치 못한 축전지 수명단축으로 인한 전원불량을 방지하고 안정적인 운전을 기할 수 있도록 된 과충전 방지기능이 부가된 무정전 전원장치를 제공함에 그 목적이 있다.The present invention has been proposed to solve the above problems, in the uninterruptible power supply by detecting the temperature rise of the battery by forcibly down the floating charging voltage of the battery, to prevent the overcharge of the battery and to preserve the life of the battery It is an object of the present invention to provide an uninterruptible power supply with an overcharge protection function to prevent power failure due to unexpected shortening of battery life and to allow stable operation.

상기와 같은 목적을 달성하기 위한 본 발명의 과충전 방지기능이 부가된 무정전 전원장치는, 축전지를 구비하며, 상용전원라인의 단전시 상기 축전지에 저장된 전력을 부하측에 공급하는 무정전 전원장치에 있어서, 상기 축전지 내부 또는 일측에 설치되어 축전지의 온도를 검출하는 온도센서; 및 상기 축전지의 부동 충전전압을 설정하는 부동 충전전압 설정부와, 상기 부동 충전전압에 비해 상대적으로 낮은 축전지의 충전전압을 설정하는 온도보상 충전전압 설정부와, 상기 온도센서에 의해 검출된 축전지의 온도가 상한 설정치 이상으로 상승하면 상기 온도보상 충전 전압 설정부로 절체하고 상기 온도센서에 의해 검출된 축전지의 온도가 하한 설정치 이하로 내려가면 상기 부동 충전전압 설정부로 절체하여 축전지에 연결하는 충전모드 절체부를 포함하는 충전장치;를 포함하여 구성된 것을 특징으로 한다.In the uninterruptible power supply having an overcharge protection function of the present invention for achieving the above object, the uninterruptible power supply is provided with a storage battery, and supplies the power stored in the storage battery to the load side when the commercial power supply line is disconnected. A temperature sensor installed inside or on one side of the battery to detect a temperature of the battery; And a floating charging voltage setting unit for setting a floating charging voltage of the storage battery, a temperature compensation charging voltage setting unit for setting a charging voltage of a storage battery which is relatively lower than the floating charging voltage, and a storage battery detected by the temperature sensor. When the temperature rises above the upper limit setting value, the battery is transferred to the temperature compensation charging voltage setting unit. When the temperature of the battery detected by the temperature sensor falls below the lower limit setting value, the charging mode switching unit is transferred to the floating charging voltage setting unit and connected to the storage battery. It characterized in that it comprises a; charging device including.

본 발명의 일실시예로서, 상기 축전지 내부에는 축전지 내에 수용된 전해액의 높이를 검출하는 레벨센서가 더 설치되며, 상기 충전모드 절체부는 상기 레벨센서에서 검출된 전해액의 레벨이 기준치 이상으로 상승하면 상기 온도보상 충전전압 설정부로 절체하고, 기준치 미만으로 내려가면 상기 부동 충전전압 설정부로 절체하도록 구성될 수 있다.In one embodiment of the present invention, a level sensor for detecting the height of the electrolyte contained in the battery is further installed inside the battery, and the charging mode switching unit is the temperature when the level of the electrolyte detected by the level sensor rises above the reference value; The control unit may be configured to switch to the compensation charging voltage setting unit, and to switch to the floating charging voltage setting unit when it is lowered below the reference value.

본 발명의 다른 실시예로서, 상기 축전지에 근접하여 축전지측으로 에어를 송풍하는 쿨링팬이 더 설치되며, 상기 쿨링팬은 상기 온도센서에 의해 검출된 축전지의 온도가 상한 설정치 이상으로 상승하거나 상기 레벨센서에 의해 검출된 전해액의 레벨이 기준치 이상으로 상승하면 작동되도록 구성될 수 있다.In another embodiment of the present invention, a cooling fan that blows air toward the storage battery in close proximity to the storage battery is further installed, and the cooling fan rises above the upper limit of the temperature of the storage battery detected by the temperature sensor or the level sensor. It can be configured to operate when the level of the electrolyte solution detected by rises above the reference value.

바람직하게는, 상기 부동 충전전압 설정부 및 온도보상 충전전압 설정부는 각각 충전전압을 가변 조절하는 가변저항을 포함하여 구성된다.Preferably, the floating charging voltage setting unit and the temperature compensation charging voltage setting unit are each configured to include a variable resistor for varying the charging voltage.

또한, 상기 충전장치는 부동 충전전압 설정부에서 설정된 부동 충전전압에 비해 상대적으로 높은 균등 충전전압을 설정하는 균등 충전전압 설정부를 더 포함 하며, 상기 충전모드 절체부는 외부의 수동 스위치가 입력되거나 설정된 시간이 도래하면 정해진 시간동안 상기 균등 충전전압 설정부로 절체하여 축전지에 연결할 수 있다.The charging device may further include an equal charging voltage setting unit configured to set a relatively high equalizing charging voltage compared to the floating charging voltage set by the floating charging voltage setting unit, and the charging mode switching unit may be configured to input or set an external manual switch. After this arrival, the battery can be connected to the storage battery by switching to the equal charging voltage setting unit for a predetermined time.

이하, 본 발명의 바람직한 실시예를 첨부된 도면 및 실시예를 참조하여 상세히 설명한다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings and embodiments.

먼저, 본 발명은 무정전 전원장치에 있어, 축전지의 온도 변화를 검출하여 축전지의 온도가 상한 설정치 이상으로 상승될 때 부동 충전전압을 강제로 다운시킴으로써, 축전지 온도 상승에 따른 과충전을 방지하는 것을 특징으로 한다. 이하의 설명에서는 축전지의 온도 변화에 따라 축전지의 충전전압을 변화시키는 구성에 대하여 중점적으로 설명하며, 축전지의 전압을 승압하여 부하측에 공급하는 인버터 및 기타 무정전 전원장치의 일반적인 구성에 대해서는 자세한 설명을 생략하기로 한다.First, the present invention is characterized in that in the uninterruptible power supply, by detecting the temperature change of the battery and forcibly lowering the floating charging voltage when the temperature of the battery rises above the upper limit, thereby preventing overcharging due to the rise of the battery temperature. do. The following description focuses on the configuration of changing the charging voltage of the battery according to the temperature change of the battery, and omits detailed description of the general configuration of the inverter and other uninterruptible power supply that boosts the voltage of the battery and supplies it to the load side. Let's do it.

도 1은 본 발명에 따른 무정전 전원장치의 일예를 보인 구성도이다. 이를 참조하면, 통상의 무정전 전원장치와 마찬가지로, 본 발명의 무정전 전원장치는 박스 형태의 큐비클(10) 내에 설치된다. 큐비클(10) 내에는 다수의 축전지(12)가 장치되며, 도시되지 않았지만, 본 발명의 무정전 전원장치는 내부에 상용전원라인의 단전을 검출하고, 상용전원라인의 단전시 축전지(12)에 저장된 전원을 부하측에 공급하는 설비들이 내장 설치된다. 또한, 도 1에서 개념적으로 도시된 바와 같이, 축전지(12)에는 상용전원에 의해 축전지(12)를 충전하는 충전장치(14)가 연결된다. 충 전장치(14)는 상용전원을 축전지(12)의 충전전압으로 다운시키는 정류회로 및 각 축전지(12)에 정류전원을 공급하여 축전지(12)들을 충전하는 충전회로 등으로 구성될 것이다. 이러한 정류회로 및 충전회로 등은 통상의 무정전 전원장치와 다름없으므로, 자세한 설명을 생략한다.1 is a configuration diagram showing an example of an uninterruptible power supply according to the present invention. Referring to this, like the conventional uninterruptible power supply, the uninterruptible power supply of the present invention is installed in the cubicle 10 in the form of a box. In the cubicle 10, a plurality of storage batteries 12 are installed, although not shown, the uninterruptible power supply of the present invention detects a power failure of a commercial power line therein, and is stored in the storage battery 12 at the time of power failure of the commercial power line. Facilities that supply power to the load side are built in. In addition, as conceptually shown in FIG. 1, the storage device 12 is connected to a charging device 14 for charging the storage battery 12 by a commercial power source. The charging device 14 may be composed of a rectifying circuit for lowering the commercial power to the charging voltage of the battery 12 and a charging circuit for charging the battery 12 by supplying the rectified power to each battery 12. Since the rectifier circuit, the charging circuit, and the like are the same as those of the conventional uninterruptible power supply, detailed descriptions thereof will be omitted.

도 1에 도시된 바와 같이, 축전지(12)의 내부 혹은 외부 일측에 축전지(12)의 온도를 검출하는 온도센서(20)가 설치된다. 또한, 각 축전지(12) 내부에는 전해액의 높이를 검출하는 레벨센서(22)가 더 설치될 수 있다. 온도센서(20)와 레벨센서(22)의 출력은 충전장치(14)에 전달되며, 충전장치(14)는 축전지(12)의 온도 상승 또는 전해액의 레벨 상승을 검출하여 축전지(12)의 부동 충전전압을 강제로 다운시킨다.As illustrated in FIG. 1, a temperature sensor 20 for detecting a temperature of the storage battery 12 is installed inside or outside one side of the storage battery 12. In addition, a level sensor 22 for detecting the height of the electrolyte may be further installed inside each storage battery 12. The outputs of the temperature sensor 20 and the level sensor 22 are transmitted to the charging device 14, and the charging device 14 detects a rise in the temperature of the storage battery 12 or a rise in the level of the electrolyte, thereby floating the storage battery 12. Force the charge voltage down.

도 1에서와 같이, 충전장치(14)는 균등 충전전압 설정부(32)와, 부동 충전전압 설정부(34)와, 온도보상 충전전압 설정부(36)와, 충전모드 절체부(30)를 포함한다. 충전모드 절체부(30)는 충전모드에 따라 균등 충전모드, 부동 충전모드, 온도보상 충전모드를 선택하여 충전장치(14)와 축전지(12)를 연결하는 절체수단으로서, 계전기 또는 PLC(Programmable Logic Controller)로 구성된다.As shown in FIG. 1, the charging device 14 includes an equal charging voltage setting unit 32, a floating charging voltage setting unit 34, a temperature compensation charging voltage setting unit 36, and a charging mode switching unit 30. It includes. The charging mode switching unit 30 is a switching means for connecting the charging device 14 and the battery 12 by selecting an even charging mode, a floating charging mode, and a temperature compensation charging mode according to the charging mode, and relay or programmable logic (PLC). Controller)

도 2의 회로도에 도시된 바와 같이, 각각의 충전전압 설정부(32)는 가변저항(VR1, VR2, VR3)을 포함하여 구성될 수 있다. 예컨대, 균등 충전전압 설정부(32)는 가변저항(VR1)을 축전지(12) 셀당 충전전압이 1.42V/Cell이 되도록 세팅하는 것으로 균등 충전전압을 설정한다. 또한, 부동 충전전압 설정부(34)는 가변저항(VR2)을 세팅하여 축전지(12) 셀당 충전전압을 1.34V/Cell로 설정하며, 온도보상 충전전 압 설정부(36)는 가변저항(VR3)을 세팅하여 축전지(12) 셀당 충전전압을 1.30V/Cell로 설정한다.As shown in the circuit diagram of FIG. 2, each charging voltage setting unit 32 may include variable resistors VR1, VR2, and VR3. For example, the equal charge voltage setting unit 32 sets the equal charge voltage by setting the variable resistor VR1 such that the charge voltage per cell of the storage battery 12 is 1.42 V / Cell. In addition, the floating charging voltage setting unit 34 sets the variable resistor VR2 to set the charging voltage per cell of the battery 12 to 1.34 V / Cell, and the temperature compensation charging voltage setting unit 36 sets the variable resistance VR3. ) To set the charging voltage per cell of the battery 12 to 1.30V / Cell.

충전모드 절체부(30)가 균등 충전전압 설정부(32)와 부동 충전전압 설정부(34)를 절체하는 것은 종래와 유사하다. 예컨대, 충전모드 절체부(30)는 평상시 1.34V/Cell의 부동 충전전압을 충전회로에 공급한다. 이때, 도 2의 회로도에서 계전기 RY2 접점이 폐쇄되면서, 부동 충전전압 설정부(34)가 충전회로에 연결될 것이다. 그리고 각각의 축전지 셀당 전압 편차를 없애기 위한 균등 충전은 수개월에 한번씩 혹은 관리감독자가 외부의 균등 충전 스위치를 입력할 때 실시된다. 이때, 도 2의 회로도에서 계전기 RY1 접점이 폐쇄되면서, 균등 충전전압 설정부(32)가 충전회로에 연결되며, 부동 충전모드에 비해 높은 1.42V/Cell의 균등 충전전압이 충전회로에 공급될 것이다. 부동 충전모드에서는 축전지(12)에 흐르는 전류 변화에 따라 축전지의 충전과 방전이 반복될 수 있으나, 균등 충전모드에서는 일정 시간 균등 충전전압이 강제로 인가된다. 균등 충전모드의 시간은 초기 설정치에 따라 달라질 수 있으며, 대략 2시간으로 설정된다. 2시간의 균등 충전이 완료되면, 충전모드 절체부(30)는 다시 계전기 RY1 접점을 개방하고, RY2 접점을 폐쇄시켜 부동 충전모드로 복귀한다.The charging mode switching unit 30 alternates between the equal charging voltage setting unit 32 and the floating charging voltage setting unit 34 is similar to the prior art. For example, the charging mode switching unit 30 normally supplies a floating charging voltage of 1.34 V / Cell to the charging circuit. At this time, the relay RY2 contact is closed in the circuit diagram of Figure 2, the floating charging voltage setting unit 34 will be connected to the charging circuit. And even charging is performed every few months or when the supervisor inputs an external equal charging switch to eliminate voltage deviations per battery cell. At this time, as the relay RY1 contact is closed in the circuit diagram of FIG. 2, the equal charging voltage setting unit 32 is connected to the charging circuit, and the equal charging voltage of 1.42 V / Cell higher than the floating charging mode will be supplied to the charging circuit. . In the floating charging mode, charging and discharging of the battery may be repeated according to a change in current flowing through the battery 12. In the equal charging mode, a uniform charging voltage is forcibly applied for a predetermined time. The time of the even charging mode may vary depending on the initial setting and is set to approximately 2 hours. When 2 hours of equal charging is completed, the charging mode switching unit 30 opens the relay RY1 contact again, closes the RY2 contact, and returns to the floating charging mode.

본 발명의 무정전 전원장치는 앞서 언급한 바와 같이, 축전지(12)의 온도 상승에 따른 과충전을 방지하기 위해 축전지(12)측에 온도센서(20)가 설치된다. 온도센서(20)는 바이메탈일 수 있으며, 축전지(12)의 온도변화를 그에 대응하는 전압치로 출력하는 통상의 센서수단일 수 있다. 충전모드 절체부(30)는 온도센서(20)에서 검출된 온도값이 상한 설정치 이상으로 상승되면, 계전기 RY2 접점을 개방하고, RY3 접점을 폐쇄시켜 온도보상 충전전압 설정부(36)로 절체된다. 본 실시예에서 온도보상 충전전압 설정부(36)는 축전지(12) 셀당 충전전압이 부동 충전전압에 비해 낮은 1.30V/Cell이 되도록 가변저항(VR3)을 세팅하는 것으로, 온도보상 충전전압을 설정한다. 따라서, 축전지(12)의 온도가 상승하여 충전전류가 상승하여도, 축전지(12)의 충전전압을 강제로 다운시킴으로써, 축전지(12)가 과충전되는 것을 방지할 수 있다.In the uninterruptible power supply of the present invention, as mentioned above, the temperature sensor 20 is installed on the storage battery 12 side to prevent overcharging due to the temperature rise of the storage battery 12. The temperature sensor 20 may be bimetal, and may be conventional sensor means for outputting a temperature change of the battery 12 to a voltage value corresponding thereto. When the temperature value detected by the temperature sensor 20 rises above the upper limit set value, the charging mode switching unit 30 is switched to the temperature compensation charging voltage setting unit 36 by opening the relay RY2 contact and closing the RY3 contact. . In the present embodiment, the temperature compensation charge voltage setting unit 36 sets the variable resistor VR3 such that the charge voltage per cell of the storage battery 12 is 1.30V / cell lower than the floating charge voltage, thereby setting the temperature compensation charge voltage. do. Therefore, even when the temperature of the storage battery 12 rises and the charging current rises, the charging voltage of the storage battery 12 is forcibly reduced, whereby the battery 12 can be prevented from being overcharged.

충전모드 절체부(30)가 온도보상 충전전압 설정부(36)로 절체된 상태에서, 온도센서(20)에서 검출된 온도값이 하한 설정치 이하로 내려가면, 충전모드 절체부(30)는 다시 계전기 RY3 접점을 개방하고, RY2 접점을 폐쇄시켜 부동 충전전압 설정부(34)로 복귀한다. 본 실시예에서, 온도센서(20)에서 검출된 온도값의 상한 설정치는 40℃, 하한 설정치는 30℃로 설정된다. 한편, 온도센서(20)의 상한 설정치 및 하한 설정치는 축전지(12)의 용량 및 규격 등에 의해 다른 값으로 설정될 수도 있음은 물론이다. 본 발명에서 온도보상 충전모드는 부동 충전모드와 마찬가지로, 온도보상 충전전압을 기준으로 축전지(12)를 충방전하는 제2의 부동 충전모드로서 기능한다.When the charging mode switching unit 30 is transferred to the temperature compensation charging voltage setting unit 36 and the temperature value detected by the temperature sensor 20 falls below the lower limit setting value, the charging mode switching unit 30 again The relay RY3 contact is opened, and the RY2 contact is closed to return to the floating charging voltage setting unit 34. In this embodiment, the upper limit set value of the temperature value detected by the temperature sensor 20 is set to 40 ° C, and the lower limit set value to 30 ° C. On the other hand, the upper limit set value and the lower limit set value of the temperature sensor 20 may be set to other values depending on the capacity and size of the storage battery 12, of course. In the present invention, the temperature compensation charging mode functions as the second floating charging mode for charging and discharging the battery 12 based on the temperature compensation charging voltage, similarly to the floating charging mode.

본 발명에서 충전모드 절체부(30)는 축전지(12) 내부의 전해액 레벨에 따라 온도보상 충전전압 설정부(36)로 절체될 수도 있다. 충전모드 절체부(30)는 레벨센서(22)에서 검출된 전해액의 레벨이 기준치 이상으로 상승되면, 위에서와 마찬가지로 부동 충전전압 설정부(34)에서 온도보상 충전전압 설정부(36)로 절체되며, 전해 액의 레벨이 기준치 미만으로 내려가면 다시 부동 충전전압 설정부(34)로 복귀하도록 작동된다.In the present invention, the charging mode switching unit 30 may be transferred to the temperature compensation charging voltage setting unit 36 according to the electrolyte level inside the battery 12. When the level of the electrolyte detected by the level sensor 22 rises above the reference value, the charging mode switching unit 30 is transferred from the floating charging voltage setting unit 34 to the temperature compensation charging voltage setting unit 36 as above. When the level of the electrolyte falls below the reference value, the floating charge voltage setting unit 34 is operated again.

이와 같이, 본 발명의 무정전 전원장치는 온도센서(20)에 의한 축전지 온도변화 검출 및 레벨센서(22)에 의한 전해액 레벨 검출을 병행하여, 축전지(12)의 부동 충전전압을 조정함으로써, 축전지(12)의 충전전류 상승에 의한 과충전을 보다 확실하게 방지할 수 있다.As described above, the uninterruptible power supply of the present invention adjusts the floating charge voltage of the battery 12 by detecting the temperature change of the battery by the temperature sensor 20 and the detection of the electrolyte level by the level sensor 22. It is possible to more reliably prevent overcharge due to the increase of the charging current in 12).

한편, 본 발명의 다른 실시예에 따르면, 축전지(12)에 근접하여 축전지(12)측으로 에어를 송풍하는 쿨링팬(24)이 더 설치될 수 있다. 바람직하게는, 쿨링팬(24)은 축전지(12) 혹은 큐비클(10)의 외측에 장착되는 히트싱크 등에 설치된다. 쿨링팬(24)은 별도의 드라이버에 의해 작동되거나 충전모드 절체부(30)에 의해 작동될 수 있다. 예컨대, 통상의 쿨링팬 드라이버와 마찬가지로 쿨링팬(24)의 정격에 맞는 DC 전원을 발생시키고, 이 DC 전원을 쿨랭팬(24)에 공급하는 스위칭소자를 포함하여 쿨랭팬 드라이버를 구성할 수 있을 것이다. 이때, 충전모드 절체부(30)에 구비된 계전기 RY3 접점이 쿨링팬(24)의 드라이버측에 병설되거나 쿨랭팬(24)의 구동을 스위칭하는 스위칭소자가 계전기 RY3의 다른 접점이다. 따라서, 쿨링팬(24)은 충전모드 절체부(30)가 온도보상 충전전압 설정부(36)로 절체될 때 동기되어 작동된다.On the other hand, according to another embodiment of the present invention, a cooling fan 24 for blowing air toward the storage battery 12 in close proximity to the storage battery 12 may be further installed. Preferably, the cooling fan 24 is installed in a heat sink or the like mounted outside the storage battery 12 or the cubicle 10. The cooling fan 24 may be operated by a separate driver or by the charging mode switching unit 30. For example, the cooling fan driver may be configured to include a switching element that generates a DC power supply corresponding to the rating of the cooling fan 24 and supplies the DC power to the cooling fan 24, similar to a general cooling fan driver. . At this time, the relay RY3 contact point provided in the charging mode switching unit 30 is provided on the driver side of the cooling fan 24 or the switching element for switching the driving of the cooling fan 24 is another contact point of the relay RY3. Thus, the cooling fan 24 is operated in synchronization when the charging mode switching unit 30 is switched to the temperature compensation charging voltage setting unit 36.

전술한 바와 같은 본 발명의 무정전 전원장치는 축전지(12)의 온도 상승에 따라 충전모드 절체부(30)에서 부동 충전전압 설정부(34)를 온도보상 충전전압 설정부(36)로 절체함으로써, 축전지(12)의 부동 충전전압을 강제로 다운시킨다. 따라 서, 축전지(12)의 온도 상승에 의해 발생될 수 있는 과충전을 방지하며, 이에 따라 축전지(12)가 과충전에 의해 수명이 단축되는 현상을 방지할 수 있게 된다. 또한, 축전지(12)의 수명이 온전히 보전됨에 따라 예기치 못한 전력 중단과 같은 사고를 예방하고, 안정적인 무정전 공급을 수행할 수 있는 장점이 있다.In the uninterruptible power supply of the present invention as described above, by switching the floating charging voltage setting unit 34 from the charging mode switching unit 30 to the temperature compensation charging voltage setting unit 36 in accordance with the temperature rise of the storage battery 12, The floating charging voltage of the storage battery 12 is forcibly lowered. Therefore, the overcharge that may be generated by the temperature rise of the storage battery 12 is prevented, and thus the battery 12 may be prevented from shortening the life due to the overcharging. In addition, as the lifespan of the storage battery 12 is maintained intact, there is an advantage of preventing an accident such as unexpected power interruption and performing a stable uninterrupted supply.

이상 설명한 본 발명은 전술한 실시예 및 첨부된 도면에 의해 한정되는 것이 아니고, 본 발명의 기술적 사상을 벗어나지 않는 범위 내에서 여러 가지 치환, 변형 및 변경이 가능하다는 것이, 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에게 있어 명백할 것이다.The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the technical field of the present invention without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

이상에서 설명한 바와 같이, 본 발명에 따른 무정전 전원장치는 축전지의 온도 상승에 의한 충전전류 상승에 기인하여 축전지가 과충전되는 것을 방지함으로써, 축전지의 수명을 온전히 보전하고, 예기치 못한 전력중단 등의 사고를 미연에 방지할 수 있는 효과가 있다.As described above, the uninterruptible power supply device according to the present invention prevents the battery from being overcharged due to the increase in the charging current caused by the temperature rise of the battery, thereby preserving the life of the battery completely, and unexpected accidents such as power interruption. There is an effect that can be prevented in advance.

또한, 본 발명에 따르면, 축전지의 온도 상승에 대응하여 부동 충전전압을 강제로 다운시킴과 동시에, 축전지의 온도를 떨어뜨리기 위한 냉각팬을 작동시킴으로써, 축전지가 보다 신속하게 원래의 부동 충전모드로 복귀되도록 하는 효과가 있다. Further, according to the present invention, the storage battery returns to the original floating charging mode more quickly by forcibly lowering the floating charging voltage in response to the temperature increase of the storage battery and operating a cooling fan for lowering the temperature of the storage battery. It is effective to make.

Claims (5)

축전지를 구비하며, 상용전원라인의 단전시 상기 축전지에 저장된 전력을 부하측에 공급하는 무정전 전원장치에 있어서,In the uninterruptible power supply device having a storage battery, and supplies the power stored in the storage battery to the load side when the commercial power line is disconnected, 상기 축전지 내부에 설치되어 축전지 내에 수용된 전해액의 높이를 검출하는 레벨센서; 및A level sensor installed inside the storage battery and detecting a height of an electrolyte solution contained in the storage battery; And 상기 축전지의 부동 충전전압을 설정하는 부동 충전전압 설정부와, 상기 부동 충전전압에 비해 상대적으로 낮은 축전지의 충전전압을 설정하는 온도보상 충전전압 설정부와, 상기 레벨센서에 의해 검출된 전해액의 레벨이 기준치 이상으로 상승하면 상기 온도보상 충전전압 설정부로 절체하고 상기 레벨센서에 의해 검출된 전해액의 레벨이 기준치 미만으로 내려가면 상기 부동 충전전압 설정부로 절체하여 축전지에 연결하는 충전모드 절체부를 포함하는 충전장치;를 포함하여 구성되는 것을 특징으로 하는 과충전 방지기능이 부가된 무정전 전원장치. A floating charging voltage setting unit for setting a floating charging voltage of the storage battery, a temperature compensation charging voltage setting unit for setting a charging voltage of a storage battery which is relatively lower than the floating charging voltage, and a level of the electrolyte detected by the level sensor. And a charging mode switching unit for switching to the temperature compensation charging voltage setting unit when the temperature rises above the reference value, and switching to the floating charging voltage setting unit when the level of the electrolyte detected by the level sensor is lower than the reference value and connected to the storage battery. Uninterruptible power supply with an overcharge protection function, characterized in that it comprises a device. 제 1항에 있어서,The method of claim 1, 상기 축전지 내부 또는 일측에는 축전지의 온도를 검출하는 온도센서가 더 설치되며, 상기 충전모드 절체부는 상기 온도센서에 의해 검출된 축전지의 온도가 상한 설정치 이상으로 상승하면 상기 온도보상 충전전압 설정부로 절체하고 상기 온도센서에 의해 검출된 축전지의 온도가 하한 설정치 이하로 내려가면 상기 부동 충전전압 설정부로 절체하여 축전지에 연결하는 것을 특징으로 하는 과충전 방지기능이 부가된 무정전 전원장치.A temperature sensor for detecting the temperature of the battery is further installed inside or on one side of the battery, and the charging mode switching unit switches to the temperature compensation charging voltage setting unit when the temperature of the battery detected by the temperature sensor rises above an upper limit set value. The uninterruptible power supply having an overcharge protection function, characterized in that when the temperature of the battery detected by the temperature sensor falls below the lower limit set value, the battery is transferred to the floating charging voltage setting unit and connected to the battery. 제 2항에 있어서,The method of claim 2, 상기 축전지에 근접하여 축전지측으로 에어를 송풍하는 쿨링팬이 더 설치되며, 상기 쿨링팬은 상기 온도센서에 의해 검출된 축전지의 온도가 상한 설정치 이상으로 상승하거나 상기 레벨센서에 의해 검출된 전해액의 레벨이 기준치 이상으로 상승하면 작동되는 것을 특징으로 하는 과충전 방지기능이 부가된 무정전 전원장치.A cooling fan is further provided to blow air toward the storage battery in proximity to the storage battery, and the cooling fan has a temperature of the battery detected by the temperature sensor rising above an upper limit setting value or the level of the electrolyte detected by the level sensor is increased. Uninterruptible power supply with overcharge protection, characterized in that when the operation rises above the reference value. 제 1항에 있어서,The method of claim 1, 상기 부동 충전전압 설정부 및 온도보상 충전전압 설정부는 각각 충전전압을 가변 조절하는 가변저항을 포함하여 구성된 것을 특징으로 하는 과충전 방지기능이 부가된 무정전 전원장치.And the floating charging voltage setting unit and the temperature compensation charging voltage setting unit are each configured to include a variable resistor for varying the charging voltage. 제 1항에 있어서,The method of claim 1, 상기 충전장치는 부동 충전전압 설정부에서 설정된 부동 충전전압에 비해 상대적으로 높은 균등 충전전압을 설정하는 균등 충전전압 설정부를 더 포함하며, 상 기 충전모드 절체부는 외부의 수동 스위치가 입력되거나 설정된 시간이 도래하면 정해진 시간동안 상기 균등 충전전압 설정부로 절체하여 축전지에 연결하는 것을 특징으로 하는 과충전 방지기능이 부가된 무정전 전원장치.The charging device may further include an equal charging voltage setting unit for setting a relatively high equalizing charging voltage compared to the floating charging voltage set by the floating charging voltage setting unit, wherein the charging mode switching unit has an external manual switch input or a set time. The uninterruptible power supply with an overcharge protection function, characterized in that the switching to the equal charging voltage setting unit for a predetermined time to connect to the storage battery.
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