KR100776708B1 - Pump operated by wind power and sunlight - Google Patents

Pump operated by wind power and sunlight Download PDF

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Publication number
KR100776708B1
KR100776708B1 KR1020070024545A KR20070024545A KR100776708B1 KR 100776708 B1 KR100776708 B1 KR 100776708B1 KR 1020070024545 A KR1020070024545 A KR 1020070024545A KR 20070024545 A KR20070024545 A KR 20070024545A KR 100776708 B1 KR100776708 B1 KR 100776708B1
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South Korea
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power
pump
wind
solar cell
energy
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KR1020070024545A
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Korean (ko)
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이준기
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(주)인텍에프에이
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0693—Details or arrangements of the wiring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S9/00—Lighting devices with a built-in power supply; Systems employing lighting devices with a built-in power supply
    • F21S9/04—Lighting devices with a built-in power supply; Systems employing lighting devices with a built-in power supply the power supply being a generator
    • F21S9/043—Lighting devices with a built-in power supply; Systems employing lighting devices with a built-in power supply the power supply being a generator driven by wind power, e.g. by wind turbines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/30—Electrical components
    • H02S40/38—Energy storage means, e.g. batteries, structurally associated with PV modules
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2210/00—Working fluids
    • F05D2210/10—Kind or type
    • F05D2210/11—Kind or type liquid, i.e. incompressible
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/60—Fluid transfer
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • 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
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S415/00—Rotary kinetic fluid motors or pumps
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S417/00—Pumps

Abstract

A pump operated by wind power and sunlight is provided to reduce operating expenses and simplify a system by not using a battery as a charging apparatus. A pump operated by wind power and sunlight includes a solar cell(100), a wind power generator(200), an interlock switch(300), a rectifier(400), a power converter(500), and a pump(600). The solar cell converts solar energy to DC electric power. The wind power generator converts wind power to AC electric power. The interlock switch receives the DC electric power and the AC electric power and selectively outputs them without interference. The rectifier converts the AC electric power received from the interlock switch to the DC electric power. The power converter converts the DC electric power to power type required for the pump. The pump operates with power supplied from the power converter.

Description

풍력 및 태양광을 이용한 양수 장치{Pump operated by wind power and sunlight}Pumping device using wind and solar power {Pump operated by wind power and sunlight}

도 1은 본 발명의 구성을 보인 블럭도.1 is a block diagram showing the configuration of the present invention.

< 도면의 주요부분에 대한 부호설명><Explanation of Signs of Major Parts of Drawings>

100 : 태양셀 200 : 풍력 발전기100: solar cell 200: wind generator

300 : 인터록 스위치 400 : 전류부300: interlock switch 400: current portion

500 : 전력 변환부 600 : 양수장치부500: power conversion unit 600: pumping unit

700 : 관개시설 700: irrigation facilities

본 발명은 풍력 및 태양광을 이용한 양수 장치에 관한 것으로, 특히 바람을 이용하여 전력을 발생하는 풍력 발전기와 태양으로부터 태양 에너지를 전달받아 전원을 발생시키는 태양 셀을 이용하여 물을 펌핑할 수 있도록 하는 풍력 및 태양광을 이용한 양수 장치에 관한 것이다. The present invention relates to a pumping device using wind power and solar light, and in particular, to allow water to be pumped using a wind generator generating power using wind and a solar cell generating power by receiving solar energy from the sun. It relates to a pumping device using wind and solar light.

일반적으로 수도 시설이 설치되지 않은 산간오지, 도서벽지 등에서는 전원을 연결할 수 있는 양수장치 즉, 펌프를 이용하여 지하 또는 저수지로부터 양수된 물을 펌핑하여 농업용수로 이용하거나, 또는 깨끗한 물은 식수로 사용하게 된다.In general, in mountainous areas and island walls where water facilities are not installed, pumping devices that can be connected to power supply, that is, pumped water from underground or reservoirs, are used as agricultural water, or clean water is used as drinking water. Done.

이러한 양수시설은 전력이 공급되는 곳에 한정되고, 전력이 공급되지 않는 곳에서는 디젤 발전기 등을 이용하여 모터 펌프를 동작시켜 식수 또는 농업용수를 공급받게 된다.Such a pumping facility is limited to a place where electric power is supplied, and where no electric power is supplied, a water pump or agricultural water is supplied by operating a motor pump using a diesel generator or the like.

그런데, 이러한 경우 발전기를 작동할 때 소비되는 연료의 비용이 과다하게 지출되어 제한적인 급수만이 가능하며, 연료를 구하기 위해서는 장거리 장시간을 이동해야 하는 번거로움을 가지고 있다. However, in this case, the cost of the fuel consumed when operating the generator is excessively limited, so that only limited water supply is possible, and it is troublesome to travel long distance long time to obtain fuel.

또한, 일반적인 자연 에너지 즉, 태양광, 풍력, 수력 등을 이용하는 경우 충전 장치를 이용하여 발생된 전력을 충전하여 자연 에너지가 공급되지 않는 경우 충전된 전력을 이용하게 되지만, 이는 기후 변화에 매우 둔감한 장치이므로 양수장치에 안정적인 전원을 공급하기가 매우 곤란하다.In addition, when using general natural energy, that is, solar, wind, hydropower, etc., the power generated by the charging device is charged, and when the natural energy is not supplied, the charged power is used, but it is very insensitive to climate change. As it is a device, it is very difficult to supply stable power to the pumping device.

다시 말하면, 전력을 충전하기 위하여 여러 가지의 자연 에너지 중 어느 하나를 통해서만 전력을 발생하므로 전력 발생 조건이 충족되지 않는 경우 전력의 충전이 곤란하다는 것이다.In other words, since power is generated only through any one of various kinds of natural energy to charge power, it is difficult to charge power when the power generation condition is not satisfied.

또한, 충전 장치로 밧데리를 사용하게 되는데, 이는 상당히 고가이며, 수명에 한계를 가지므로, 운영비용이 상승하게 되는 단점이 있다.In addition, the use of the battery as a charging device, which is quite expensive, and has a disadvantage in that the operating cost is increased, because it has a limited lifetime.

따라서, 본 발명은 상기한 바와 같은 문제점을 해결하기 위하여, 전력이 공급되지 않는 곳에서도 전력 또는 화석 연료의 에너지원이 없이도 풍력과 태양광에 의해서 원활한 전력 공급에 의한 용수의 공급이 이루어지도록 하여 에너지 절감 및 환경 친화적인 에너지를 얻도록 하는데 목적이 있다.Therefore, in order to solve the problems as described above, the energy is supplied to the water by a smooth power supply by the wind and sunlight even without power or fossil fuel energy source in the place where power is not supplied. The purpose is to obtain energy saving and environmentally friendly.

이러한 목적을 달성하기 위하여 본 발명은,In order to achieve this object, the present invention,

태양광 에너지를 직류 전기 에너지로 변환하는 태양 셀;Solar cells for converting solar energy into direct current electrical energy;

바람의 힘을 교류 전기 에너지로 변환하는 풍력 발전기;A wind generator that converts wind power into alternating electrical energy;

상기 태양 셀과 풍력 발전기의 출력인 직류 및 교류 전기 에너지를 인입받아 상호 간섭없이 선택적으로 절체시켜 출력하는 인터록 스위치;An interlock switch that receives DC and AC electrical energy output from the solar cell and the wind generator and selectively alternates and outputs the interference without mutual interference;

상기 인터록 스위치로부터 선택되어 공급되는 전기 에너지가 교류인 경우 직류 전원으로 정류시키는 정류부;A rectifier for rectifying the DC power when the electric energy selected from the interlock switch is AC;

상기 정류부로부터 공급되어진 직류 전원을 양수기의 소요 전원 형태로 변환하는 전력 변환부;A power converter converting the DC power supplied from the rectifier into the required power of the pump;

상기 전력 변환부로부터 공급되는 전원에 의하여 펌핑을 행하는 양수기;로 구성된 것을 특징으로 한다.And a pump for pumping by the power supplied from the power converter.

또한, 상기 전력 변환부는 태양 셀과 풍력 발전기의 출력 에너지의 크기를 감지하여 최대 출력점 추종 제어를 통하여 양수기를 구동시키도록 구성된다.In addition, the power converter is configured to sense the magnitude of the output energy of the solar cell and the wind generator to drive the pump through the maximum output point tracking control.

이와 같이 구성된 본 발명을 첨부한 도면을 참조하여 상세히 설명한다.The present invention configured as described above will be described in detail with reference to the accompanying drawings.

먼저, 자연 에너지를 전기 에너지로 변환하기 위하여 태양 셀(100)과 풍력 발전기(200)를 이용하게 되는데, 이는 태양의 일조량이 적은 날이나 바람이 적게 부는 날에 두 시스템 즉 태양 셀(100)과 풍력 발전기(200)의 상보 작용을 이용하기 위함이다.First, the solar cell 100 and the wind generator 200 are used to convert natural energy into electrical energy. That is, the solar cell 100 and the solar system 100 are used on the day when the sun is low or the day when the wind is low. This is to use the complementary action of the wind generator 200.

태양 셀(100)은 주간에 태양에서 발산되는 태양광 에너지를 모으는 PV 모듈을 다수 배치하여 구성하고, 지면과는 약간의 경사각을 두어 태양광을 최적으로 수집할 수 있도록 설치된다.Solar cell 100 is configured by arranging a large number of PV modules to collect the solar energy emitted from the sun during the day, and is installed so as to optimally collect sunlight with a slight inclination angle from the ground.

이러한 태양 셀(100)은 태양광을 직류 전원으로 변환하여 인터록 스위치(300)쪽으로 출력한다.The solar cell 100 converts sunlight into direct current power and outputs it toward the interlock switch 300.

풍력 발전기(200)는 바람의 힘을 이용하여 교류 전기 에너지로 변환하여 인터록 스위치(300)쪽으로 출력하게 된다.The wind generator 200 converts into alternating current electrical energy by using the force of the wind and outputs it toward the interlock switch 300.

인터록 스위치(300)는 상기 태양 셀(100) 및 풍력 발전기(200)로부터 발생된 직류 및 교류 전기 에너지를 상호 간섭없이 절체하여 정류부(400)로 제공하게 된다.The interlock switch 300 transfers DC and AC electrical energy generated from the solar cell 100 and the wind generator 200 without mutual interference to provide the rectifier 400.

정류부(400)는 인터록 스위치(300)로부터 공급되는 직류 전원을 전력 변환부(500)쪽으로 바이패스시키고, 또한 전원 발생단과 부하측과의 역접속을 방지한다.The rectifier 400 bypasses the DC power supplied from the interlock switch 300 toward the power converter 500, and also prevents reverse connection between the power generation stage and the load side.

반면에 인터록 스위치(300)로부터 교류 전원이 공급되는 경우 이를 직류 전 원 형태로 정류하여 출력하게 된다.On the other hand, when AC power is supplied from the interlock switch 300, it is rectified in the form of DC power and output.

전력 변환부(500)는 정류부(400)로부터 공급되는 직류 전원을 부하측인 양수기(600)의 전원 소모 형태에 따라 변환하게 되는데, 예를 들면 양수기(600)가 직류 모터를 사용하는 경우 전압과 전류량을 그에 적절하게 변환시키고, 교류 모터를 사용하는 경우 전원 컨버팅을 통하여 교류 전압과 전류를 갖는 전원을 형성하게 된다.The power converter 500 converts the DC power supplied from the rectifier 400 according to the power consumption of the water pump 600 on the load side. For example, when the water pump 600 uses a DC motor, the voltage and current amount In this case, a power source having an AC voltage and a current is formed through power conversion when using an AC motor.

이렇게 형성된 전원은 양수기(600)로 공급되어 식수 또는 농업 용수를 지하로부터 펌핑하게 된다.The power thus formed is supplied to the water pump 600 to pump drinking water or agricultural water from the basement.

이때, 전력 변환부(500)는 태양 셀(100)과 풍력 발전기(200)에서 발생되어 직류 전원 형태로 인입되는 두 시스템의 에너지를 측정하여 최대 출력점 추종(Maximum Power Point Tracking) 제어를 통하여 상시 최대 파워로 양수기(600)를 구동시키게 된다.
최대 출력점 추종 제어란, 2개 이상의 전력 발생원으로부터 발생된 전력의 차이가 발생하는 경우 더 높은 전력을 갖는 전력 발생원으로부터 전력을 공급받아 사용함으로써 현재 공급되는 다수의 전력중 최대 파워의 전력을 선택하여 사용하는 제어 방식이다.
예를 들면, 태양 셀(100)로부터 공급되는 전력량이 풍력 발전기(200)로부터 공급되는 전력량보다 큰 경우 이를 동시에 사용하게 되면 태양 셀(100)과 풍력 발전기(200)로부터의 전력이 평균치로 변환되므로, 태양 셀(100)의 전력이 풍부함에도 불구하고 전력량이 저하되는 경우가 발생하게 된다.
따라서, 이러한 경우에는 풍력 발전기(200)로부터 출력되는 전력은 배제시키고, 태양 셀(100)로부터 출력된 전력만을 선택함으로써 태양 셀(100)과 풍력 발전기(200)의 최대 출력점을 추종 즉 선택하도록 제어하는 것이다.
물론, 풍력 발전기(200)로부터 공급되는 전력량이 태양 셀(100)로부터 공급되는 전력량보다 큰 경우에도 이러한 최대 출력점 추종 제어 방식에 의하여 풍력 발전기(200)로부터의 전력만을 선택하여 사용하게 된다.
따라서, 양수기(600)는 현재 공급되는 2중의 전력원 중 더 큰 파워 즉, 상시 최대 파워로 펌핑을 행하여 관개시설(700)로 양수된 물을 공급한다.
이 양수된 물은 바로 용수가 필요한 장소로 흐르기도 하고, 별도의 양수 탱크에 저장되다가 필요한 식수나 농업용수로 사용할 수 있다. In this case, the power converter 500 measures energy of two systems generated by the solar cell 100 and the wind generator 200 and introduced into a DC power source, and is constantly controlled through maximum power point tracking. The pump 600 is driven at the maximum power.
Maximum output point tracking control is to select the power of the maximum power among the plurality of power currently supplied by using the power from the power source having a higher power when the difference in power generated from two or more power generation source occurs The control method used.
For example, when the amount of power supplied from the solar cell 100 is greater than the amount of power supplied from the wind generator 200, the power from the solar cell 100 and the wind generator 200 is converted into an average value when used simultaneously. In spite of the abundance of power of the solar cell 100, the amount of power may decrease.
Therefore, in this case, the power output from the wind generator 200 is excluded, and only the power output from the solar cell 100 is selected so that the maximum output point of the solar cell 100 and the wind generator 200 may be tracked or selected. To control.
Of course, even when the amount of power supplied from the wind generator 200 is greater than the amount of power supplied from the solar cell 100, only the power from the wind generator 200 is selected and used by the maximum output point following control scheme.
Accordingly, the pump 600 supplies the pumped water to the irrigation system 700 by pumping at a larger power, that is, the maximum power of the dual power sources currently supplied.
The pumped water flows directly to where the water is needed and can be stored in a separate pumping tank for use as drinking or agricultural water.

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전력이 공급되지 않거나 전력 사정이 좋지 않은 곳에 디젤 발전기를 이용하지 않고 순수자원인 풍력 및 태양광을 이용해서 원활한 용수의 공급이 이루어지는 것이다. Where no power is supplied or power is not good, a smooth supply of water is achieved by using wind and solar power, which are pure resources, without using a diesel generator.

이상에서 설명한 바와 같이, 본 발명의 풍력 및 태양광을 이용한 양수 장치에 의하면, 전기가 공급되지 않는 산간벽지 또는 오지에서도 청정에너지인 풍력과 태양광을 이용해서 원활한 용수의 공급이 이루어지도록 한 효과가 있다. As described above, according to the pumping device using the wind and solar light of the present invention, even in the mountain wall or remote areas where electricity is not supplied, the effect of smoothly supplying the water by using the wind and solar light, which is clean energy, is achieved. have.

이는 전력 발전소를 통한 전력 또는 연료 등의 에너지 없이도 모터 펌프의 동작이 가능하도록 하여 에너지 절감 및 환경 친화적이다. This enables the operation of the motor pump without energy such as power or fuel through the power plant, thereby saving energy and being environmentally friendly.

또한 충전 장치로 일반적으로 사용하는 밧데리를 사용하지 않기 때문에 수명의 한계 및 시스템이 간단하고 저렴해지는 효과가 있다.In addition, since the battery is not generally used as a charging device, there is a limit on the lifetime and the system becomes simple and inexpensive.

Claims (2)

태양광 에너지를 직류 전기 에너지로 변환하는 태양 셀;Solar cells for converting solar energy into direct current electrical energy; 바람의 힘을 교류 전기 에너지로 변환하는 풍력 발전기;A wind generator that converts wind power into alternating electrical energy; 상기 태양 셀과 풍력 발전기의 출력인 직류 및 교류 전기 에너지를 인입받아 상호 간섭없이 선택적으로 절체시켜 출력하는 인터록 스위치;An interlock switch that receives DC and AC electrical energy output from the solar cell and the wind generator and selectively alternates and outputs the interference without mutual interference; 상기 인터록 스위치로부터 선택되어 공급되는 전기 에너지가 교류인 경우 직류 전원으로 정류시키는 정류부;A rectifier for rectifying the DC power when the electric energy selected from the interlock switch is AC; 상기 정류부로부터 공급되어진 직류 전원을 양수기의 소요 전원 형태로 변환하는 전력 변환부;A power converter converting the DC power supplied from the rectifier into the required power of the pump; 상기 전력 변환부로부터 공급되는 전원에 의하여 펌핑을 행하는 양수기;로 구성되며,A pump for pumping by the power supplied from the power converter; 상기 전력 변환부는 태양 셀과 풍력 발전기의 출력 에너지의 크기를 감지하여 최대 출력점 추종 제어를 통해 양수기를 구동시키는 것을 특징으로 하는 풍력 및 태양광을 이용한 양수 장치.The power converter detects the magnitude of the output energy of the solar cell and the wind generator and drives the water pump through maximum output point following control. 삭제delete
KR1020070024545A 2007-03-13 2007-03-13 Pump operated by wind power and sunlight KR100776708B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101533248B1 (en) * 2008-09-22 2015-07-09 엘지전자 주식회사 Hybrid power converting apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200373968Y1 (en) 2004-11-09 2005-01-21 (주)에타솔라 Hybridr street light system with tracking

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200373968Y1 (en) 2004-11-09 2005-01-21 (주)에타솔라 Hybridr street light system with tracking

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101533248B1 (en) * 2008-09-22 2015-07-09 엘지전자 주식회사 Hybrid power converting apparatus

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