KR101557847B1 - Small photovoltaic system for home - Google Patents

Abstract

The present invention uses a small-sized solar cell module as a solar cell power generation device and uses a high-capacity and high-safety lithium iron phosphate secondary cell as an energy storage device, thereby enabling long-term energy use and prolonging the service life of the energy storage device The present invention relates to a small-sized PV system for household use, and more particularly, to a midnight power supply unit for supplying commercial power supplied at nighttime; A solar battery unit which is formed so as to be movable and condenses sunlight to convert it into electric energy, and supplies the solar energy; An energy storage device that charges electric energy supplied from a solar battery unit or a commercial power supply supplied from a late night power supply unit in response to a charge control signal inputted from the outside and supplies electric energy stored in response to an external discharge control signal, part; An inverter for receiving the DC electric energy of the energy storage unit and converting the DC electric energy into AC electric energy; And a control device for outputting a charge request signal to the energy storage device during the charge time and outputting a discharge request signal to the energy storage device during the discharge time. Accordingly, it is easy to install because it generates energy only through sunlight without supplying power from the outside, and a highly efficient lithium iron phosphate secondary battery is a storage means for storing electric energy generated from the sunlight, Extension of the life span has the advantage of having excellent economy without burdening electric power and maintenance cost.

Description

{Small photovoltaic system for home}

The present invention relates to a small-sized solar power generation system for household use, and more particularly, to a solar power generation system using a small-sized solar cell module as a photovoltaic power generation device and using a lithium- , And a home small-sized photovoltaic power generation system capable of prolonging the service life of the energy storage device.

Solar energy is an eco-friendly energy source that is not depleted. Recently, it has been attracting attention as an important future energy source that has been actively researched and developed by governments and companies in various countries to overcome the energy crisis due to depletion of fossil fuels.

For industrial use of such solar energy, solar cells that convert solar energy into electricity, energy storage devices that can store the power generated by solar cells, control devices that control the charging and discharging of energy storage devices Is required.

 At present, an important concern of solar energy utilization is the reliability of long-term use of design and energy storage device in the direction that anyone can use easily by downsizing the flow of solar energy utilization that has been focused on large power generation. can do.

In recent years, in addition to large-scale solar cell power generation facilities, it has also been necessary to store the power obtained from small solar cells in energy storage means by applying solar energy to outdoor lighting such as street lights and road safety, The system for driving the illumination through the reserved power according to the present invention has been actively developed. The illumination system using the solar light is different from the conventional illumination supplied with the external power, And convenience of maintenance and retention. Therefore, it is receiving much attention and expectation from related organizations.

However, in the case of such a solar lighting system, there is a distinction from a power generation system that stores energy through solar power generation for other purposes, and the solar lighting system is structurally limited in size, There is still a difficult problem with energy storage and use.

Korean Unexamined Patent Publication No. 10-2011-0079035 [Title of the invention: Solar light collecting means and boiler heat source complementary switching system] Korean Registered Patent No. 10-1126076 [Description of the Invention: Solar Collecting Device and Solar Light Concentration Control System Using Reflector and Control Method Thereof]

In order to meet such a demand, the present invention uses a small-scale solar cell module as a solar cell power generation device and uses a lithium-ion secondary battery having a high capacity and safety as an energy storage device, Which is capable of prolonging the service life of the solar cell.

It is another object of the present invention to provide a small-sized solar power generation system for households which can easily understand and use photovoltaic power generation by installing a solar cell module optimized for an apartment veranda constituting a majority of domestic residential buildings.

It is another object of the present invention to provide a small-sized solar power generation system for home use that can be used as an auxiliary power device for camping which is excellent in mobility and safety.

In addition, the present invention provides a small-sized solar power generation system for home use that can be installed in various types of spaces such as apartment areas, a pantry, a pension, a general house, and a ship (yacht) .

A small-sized solar power generation system according to an embodiment of the present invention includes a late-night power supply unit for supplying commercial power supplied at night; A solar battery unit which is formed so as to be movable and condenses sunlight to convert it into electric energy, and supplies the solar energy; An energy storage unit that charges electric energy supplied from a solar battery unit or a commercial power supply unit supplied from the nighttime power supply unit in response to a charge control signal inputted from the outside and supplies energy stored in response to an external discharge control signal to the outside A device section; An inverter for receiving the DC electric energy of the energy storage unit and converting the DC electric energy into AC electric energy; And a control unit for outputting a charge request signal to the energy storage unit during the charging time and outputting a discharge request signal to the energy storage unit during the discharging time.

As an embodiment related to the present invention, an AC power connection part and a DC power connection part are separately provided, an AC power connection part is connected to an inverter, and a DC power connection part can be connected to a control device.

In an embodiment related to the present invention, the energy storage unit is composed of a plurality of battery cells, and the control device checks charge states for each of the plurality of battery cells, controls the checked charge state to be displayed externally, And an output unit outputting a state of charge of the energy storage unit in response to the control of the apparatus.

As an embodiment related to the present invention, the control device may display the charge amount of the present energy storage unit through the output unit, and calculate and provide the usage time corresponding to the charge amount.

As an embodiment related to the present invention, the energy storage unit may be made of lithium iron phosphate (LiFePO4) secondary battery configured in series and in parallel.

As an embodiment related to the present invention, the control device can set the battery use cut-off value of the energy storage unit, and when the cut-off value is set, the charge voltage of the energy storage unit is maintained at the set cut- And a display unit for displaying the steady state and the low voltage state differently according to the control of the control unit.

In an embodiment related to the present invention, the display unit may include a red light emitting diode and a green light emitting diode.

According to another aspect of the present invention, there is provided a miniature solar power generating system for household use, comprising: a case; An energy storage unit, an inverter, and a control unit are provided on the inside of the case, and a display unit, an output unit, and an input unit are provided on one side of an upper side of the case. A wheel is provided on a lower surface of the case. A handle may be provided.

In the embodiment of the present invention, the control device has a charge time and a discharge time set in advance, outputs a charge request signal to the energy storage unit during the charge time, outputs a discharge request signal to the energy storage unit during the discharge time, The energy storage unit charges electric energy supplied from a solar battery unit or a commercial power supply supplied from a midnight power supply unit in response to a charge control signal input from a control unit and supplies electric energy stored in response to a discharge control signal input from the control unit to an external And the inverter can supply the DC electric energy of the energy storage unit and convert it into AC electric energy.

The present invention is easy to install because it generates energy only through sunlight without the need for external power supply from the outside, and a highly efficient lithium iron phosphate secondary battery is a storage means for storing electric energy generated from the sunlight, Extension of the life span has the advantage of having excellent economy without burdening electric power and maintenance cost.

In addition, the present invention is designed to be suitable for a common residential facility such as an apartment constituting a majority of domestic residential facilities, and is effective for educational use which can change a paradigm for energy use.

In addition, the present invention makes it possible to make reasonable use of energy in the home, and it can be used as a power device for camping, which has recently been expanded in the market.

In addition, the present invention has an effect that it is possible to easily install and use the electric power for night construction in the same place as the external construction where the generator should be used without any additional wiring connection.

In addition, the present invention employs a LiFePO4 secondary battery having excellent safety, so that it can be easily and safely used by anyone for home use.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing the appearance of a small household solar power generation system according to the present invention; FIG.
2 is a block diagram for explaining the construction of a small household solar power generation system according to the present invention.
FIG. 3 is a view for explaining a state in which a small home solar power generation system according to the present invention is installed in a home.
FIG. 4 is a view for explaining charging states and discharging states of solar and night-time electric power according to time zones in a small household solar power generation system according to the present invention.

It is noted that the technical terms used in the present invention are used only to describe specific embodiments and are not intended to limit the present invention. In addition, the technical terms used in the present invention should be construed in a sense generally understood by a person having ordinary skill in the art to which the present invention belongs, unless otherwise defined in the present invention, Should not be construed to mean, or be interpreted in an excessively reduced sense. In addition, when a technical term used in the present invention is an erroneous technical term that does not accurately express the concept of the present invention, it should be understood that technical terms can be understood by those skilled in the art. In addition, the general terms used in the present invention should be interpreted according to a predefined or prior context, and should not be construed as being excessively reduced.

Furthermore, the singular expressions used in the present invention include plural expressions unless the context clearly dictates otherwise. In the present invention, terms such as "comprising" or "comprising" and the like should not be construed as encompassing various elements or various steps of the invention, Or may further include additional components or steps.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like or similar elements throughout the several views, and redundant description thereof will be omitted.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. It is to be noted that the accompanying drawings are only for the purpose of facilitating understanding of the present invention, and should not be construed as limiting the scope of the present invention with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing the appearance of a small household solar power generation system according to the present invention; FIG. 2 is a block diagram for explaining the construction of a small household solar power generation system according to the present invention. FIG. 3 is a view for explaining a state in which a small home solar power generation system according to the present invention is installed in a home. FIG. 4 is a view for explaining charging states and discharging states of solar and night-time electric power according to time zones in a small household solar power generation system according to the present invention.

1, the small household solar power generating system according to the present invention includes a case 100 and an energy storage unit 200, an inverter 300, and a control unit 300 shown in FIG. 2, A display unit 500, an output unit 600 and an input unit 700 are provided on one upper side of the case and a wheel 800 is provided on a lower surface of the case 100 , And a handle (900) is provided on a side surface of the case (100). At this time, the case 100 preferably includes a high-strength metal frame and a high-strength polycarbonate material as a secondary battery having a large load is incorporated therein

In addition, the case 100 is provided with a cable 1200 connected to the night-time power supply unit (1000 in Fig. 2) and the solar battery unit (1100 in Fig. 2), respectively.

A DC power connection part 1300 and an AC power connection part 1400 are connected to one side of the case 100 and connected to a plug provided in a load (electronic product) operated by a DC power source and a load (electronic product) .

In this case, the midnight power supply unit 1000 is supplied with the commercial power supplied in the middle of the night, so that the secondary battery of the energy storage unit 200 is charged.

The solar battery unit 1100 is configured to be movable, and collects sunlight to convert it into electrical energy, and then charges the secondary battery of the energy storage unit 200.

The energy storage unit 200 charges electric energy supplied from the solar cell unit 1100 or a commercial power supplied from the late night power supply unit 1000 in response to a charge control signal input from the control device 400, And supplies the electric energy stored in response to the discharge control signal input from the controller 400 to the outside.

The energy storage unit 200 is composed of a lithium-iron phosphate (LiFePO 4) secondary battery configured in series and in series. In the case of a lithium-iron phosphate (LiFePO 4) secondary battery, the battery has a minimum energy of 50 Ah or more. Cycle life, and stable performance at high temperatures.

The energy storage unit 200 includes a plurality of battery cells.

The inverter 300 receives the DC electric energy of the energy storage unit 200 and converts it into AC electric energy.

The AC power supply connection part 1400 is connected to the inverter 200 and the DC power connection part 1300 is connected to the control device 400. The AC power supply connection part 1400 and the DC power connection part 1300 are separately provided. It is connected.

The control device 400 outputs a charge request signal to the energy storage unit 200 during the charging time and outputs a discharge request signal to the energy storage unit 200 during the discharge time Output.

The control device 400 checks the state of charge of each of the plurality of battery cells and controls the state of the checked state of charge to be displayed through the output unit 600.

That is, the output unit 600 outputs the charged state of the energy storage unit 200 to the outside in response to the control of the control device 400, so that the user can easily recognize the state of charge.

The control device 400 displays the current charge amount of the energy storage unit 200 through the output unit 600 and calculates and provides the usage time corresponding to the charge amount.

The control device 400 allows the battery use cut-off value of the energy storage device 200 to be set. When the cut-off value is set, the charge voltage of the energy storage device 200 is set to be equal to or greater than a set cut- Control is performed so as to be displayed in a steady state when it is maintained, and is displayed in a low-voltage state when it is lowered to a cutoff value or less. In other words, the display unit 500 including the red light emitting diode and the green light emitting diode lights up the green light emitting diode in the steady state and the red light emitting diode in the low voltage state according to the control of the control device 400.

The operation of the small household solar power generation system constructed as described above will be described below.

(Small home PV system)

As shown in FIG. 1, the home small solar power generation system is in the form of a movable box, and the wheels 800 are provided on the lower surface of the housing, so that a female or an underpowered knob 900 You can grab and drag the solar power system to the desired location.

In addition, a connector for connecting a load (an electronic product) driven by a DC power source and a connector for connecting a load (an electronic product) driven by an AC power source are provided on one side of a home small-

In addition, the display unit 500, the output unit 600, and the input unit 700 are provided on the upper surface that can be easily recognized by users.

4, the solar cell unit 1100 may be installed in a direction in which the sunlight is easily taken out from the verandah. Therefore, the solar battery unit 1100 and the small household solar power generation system are connected to each other by a cable 1200. The cable 1200 can secure a sufficient distance between the solar power generation unit and the small- And if the cable 1200 can be used shortly, it is possible to provide a cable winding device inside the small household solar power generation system, so that the cable 1200 can be realized without inconvenience.

In addition, when the solar battery module 1100 is installed on the veranda by providing a clamp, it is easy to install the solar battery module 1100 in accordance with the solar radiation direction.

(Charging and charging of small household PV systems Discharge mode )

Assuming that the sunrise is at 7:00 am and the sunset is at 6:00 pm and the nighttime power time is from 11:00 pm to 6:00 am as shown in FIG. 4, the control device 400 is operated from 11:00 pm to 6:00 am The energy storage unit 200 is connected to the midnight power supply unit 1000 so that the midnight power is supplied to the energy storage unit 200 and the energy storage unit 200 is charged by the night power.

The controller 400 receives the loads (electronic products) connected to the AC power connection unit 1400 and the DC power connection unit 1300 from the charged energy storage unit 1000 using the nighttime power from 6:00 am to 6:00 pm, So that the driving power is supplied. At this time, the driving power supplied to the load (electronic product) requiring AC power is supplied through the inverter 300.

The controller 400 disconnects the energy storage unit 200 and the midnight power supply unit 1000 at the current time of seven o'clock and outputs the energy storage unit 200 and the solar battery unit 1100 And the energy storage unit 200 is charged by the electric energy generated by the sunlight.

The control device 400 is connected to the AC power connection unit 1400 and the DC power connection unit 1300 from the energy storage unit 200 charged by the electric energy generated by the sunlight from 6 PM to 11 PM So that the driving power is supplied to the load (electronic product).

That is, the small household solar power generation system implemented by the present invention automatically starts AC (alternating current) charging at the time of the night time power and automatically performs DC (direct current) charging when the sunrise time comes During the DC charging, the loads (electronic components) are activated using the energy charged with AC.

At this time, the control device 400 outputs the charge amount of the energy storage unit 200 through the output unit 600 to allow the user to know the charge amount, Time information on how many hours (electronic product) connected to the photovoltaic system can be used is output through the output unit 600 so that the user can recognize the time and use the load (electronic product).

In addition, the control device 400 stores a cut-off reference voltage for a battery, recognizes a charge voltage for a plurality of batteries constituting the energy storage unit 200, And the status is displayed through the display unit 500 in comparison. For example, when the charging voltage of the plurality of batteries is greater than the battery use cutoff voltage, the control device 400 causes the green light emitting diode of the display unit 500 to be turned on, and conversely, the plurality of battery charging voltages are higher than the battery use cutoff voltage The control device 400 causes the red light emitting diode of the display unit 500 to be turned on so that the user can visually recognize the red light emitting diode easily.

On the other hand, the control device 400 provides an information setting change menu item through the output unit 600 so that the user can change the sunrise time, the sunset time, and the battery use cutoff voltage stored in the control device 400, 700) to change the value. Here, the output unit 600 may also implement a touch pad, and in this case, the separate input unit 700 may be omitted.

(Energy of household small-sized photovoltaic power generation system The storage unit Monitoring mode )

The household solar power generation system includes a temperature sensor 1600. The temperature sensor 1600 senses the ambient temperature of the energy storage unit 200 that is raised by the heat generated during charging and outputs the sensed temperature to the control unit 400. [ . Then, the control device 400 compares the preset temperature with the temperature sensed by the temperature sensor 1600, and when the temperature is higher than the preset temperature, the control unit 400 operates the alarm unit 1700 so that the user can know the operation, .

In the case where an abnormal phenomenon occurs in the small household solar power generation system as described above, the control device 400 may be used in a case where the home small-sized photovoltaic power generation system is installed outside the house, for example, The alarm unit 1700 generates an alarm signal through the alarm unit 1700. The alarm unit 1700 also determines whether there is a telephone number registered in advance, generates a warning message when a telephone number exists, (1800) to the registered telephone number so that the manager (user) can know it, and the follow-up action can be made quickly.

(For small household PV systems Solar power Rotation drive mode )

The solar battery unit 1100 is installed in a supporting device (not shown) capable of rotating and driving, and the solar battery unit 1100 follows the sunlight It can also be implemented to move. At this time, the rear surface of the solar battery module 1100 further includes coupling means that can be coupled to the supporting device.

That is, the illuminance sensor 1500 is provided in the home small-size solar power generation system, and the illuminance of the current position is detected to output the illuminance value. Then, the control device 400 recognizes the direction in which the current sunlight is most strongly incident according to the illuminance value input by the illuminance sensor 1500. At this time, the control device 400 determines whether the recognized direction is opposite to the solar battery unit 1100, and controls the rotation driving unit of the supporting device based on the determination result, so that the rotation driving unit is rotated in a predetermined direction do. Therefore, the small-sized solar power generation system in which the present invention is applied outdoors allows the solar cell unit 1100 to move as the sun moves from sunrise to sunset so that more electricity can be produced through the solar cell unit 1100.

In the case of the solar cell adopted in the present invention, there are limitations on the use of electric power in that the standard is limited. In order to efficiently use such limited electric power, the control device employed in the present invention must be designed as a circuit driven with low power It is essential. The control device is designed to minimize the power consumed and is designed to store the generated power in the energy storage unit as little as possible.

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 essential characteristics thereof. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100: Case 200: Energy storage unit
300: Inverter 400: Control device
500: display unit 600: output unit
700: input unit 800: wheel
900: Handle 1000: Midnight power supply
1100: Solar panel 1200: Cable
1300: DC power connection part 1400: AC power connection part
1500: illuminance sensor 1600: temperature sensor
1700: alarm part 1800: communication part

Claims (9)

A night-time power supply unit for supplying a commercial power supply supplied at night;
A solar battery unit which is formed so as to be movable and condenses sunlight to convert it into electric energy, and supplies the solar energy;
A charging control unit for charging the battery with electric power supplied from the solar battery unit or a commercial power supply supplied from the nighttime power supply unit in response to a charging control signal inputted from the outside and supplying the electric energy stored in response to an external discharge control signal A storage unit;
An inverter for receiving the DC electric energy of the energy storage unit and converting the AC electric energy into AC electric energy;
A control unit for outputting a charge request signal to the energy storage unit during a charge time and outputting a discharge request signal to the energy storage unit during a discharge time, the charge time and the discharge time being preset; And
And a case having the energy storage unit, the inverter, and the control unit disposed inside and having a display unit, an output unit, and an input unit on one upper surface,
The case is connected to the night power supply unit and the solar battery unit which are located outdoors in a state of being placed indoors by a cable and the cable winding apparatus is provided inside the case so that the cable can be used even when the length of the cable is short ,
The solar cell unit is installed in a veranda, and a clamp is provided to facilitate installation in the veranda in accordance with the solar radiation direction,
A temperature sensor for sensing an ambient temperature raised by heat generated during charging of the energy storage unit and outputting the detected ambient temperature to the control unit; And an alarm unit for activating the control unit when the temperature of the control unit is higher than a preset temperature after comparing the temperature sensed by the temperature sensor with a predetermined temperature. The method according to claim 1,
Wherein the AC power connection unit and the DC power connection unit are separately provided, the AC power connection unit is connected to the inverter, and the DC power connection unit is connected to the control device. The method according to claim 1,
The energy storage unit is composed of a plurality of battery cells,
The control device checks a state of charge for each of the plurality of battery cells, controls the state of the checked state of charge to be externally displayed,
And an output unit for outputting a state of charge of the energy storage unit in response to a control of the control unit. The method of claim 3,
Wherein the controller displays the current charge amount of the energy storage unit through the output unit and calculates and provides the usage time corresponding to the charge amount. The method according to claim 1,
Wherein the energy storage unit comprises a lithium-iron phosphate (LiFePO4) secondary battery constructed in a series-parallel manner. The method according to claim 1,
The control device may set a battery use cut-off value of the energy storage device. When the cut-off value is set, the control device displays a steady state when the charge voltage of the energy storage device is maintained at a set cut- And when the voltage falls below the cut-off value, the display is controlled to be in a low-voltage state,
Further comprising a display unit for displaying a steady state and a low-voltage state differently in response to a control of the control device. The method according to claim 6,
Wherein the display unit comprises a red light emitting diode and a green light emitting diode. delete delete

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