KR102288879B1 - Battery charging device - Google Patents

Abstract

Disclosed is a battery charging device that can be manufactured at a low unit cost without using a complex circuit structure and a large number of elements. The present invention is a power supply unit for generating power; a battery unit including a plurality of batteries charged by receiving power generated from the power supply unit and a charging switch connected to each of the plurality of batteries; and a control unit for controlling on/off of the charging switch.

Description

Battery charging device

The present invention relates to a battery charging device capable of selecting a battery to be connected to a power supply unit according to the state of charge of each battery in order to transmit maximum power from a power supply unit to a battery.

Recently, an electric vehicle (EV) using an electric battery capable of being charged and discharged as a power source or a hybrid vehicle (HEV) using an electric battery and another power source together has been commercialized as an eco-friendly vehicle. One of the major drawbacks of these electric vehicles is that they have a long charging time. Although there are differences by car model, slow charging takes at least 4 to 10 hours, and fast charging takes at least 30 minutes and up to 1 hour.

As such, there is a problem that the minimum time for fast charging is also about three times longer than the average refueling time of a general car of 10 minutes, and furthermore, there is a problem that fast charging requires only charging up to 80% of the battery capacity in consideration of the battery life.

In order to overcome this problem, an electric vehicle of a battery replacement method and an electric vehicle charging station can be an alternative. The system is disclosed.

On the other hand, a photovoltaic system may be installed in such a battery replacement charging station and used to charge the battery.

In the case of the power control circuit included in the conventional photovoltaic system, the maximum power operating point is instantaneously set to output the maximum power according to the current-voltage (IV) curve of the photovoltaic panel, which is changed according to the change in temperature and insolation. is configured to be controlled.

However, since such a power control circuit has a complex structure and has a large number of elements and a large number of controllers, the installation cost and failure rate are inevitably increased, and it is an obstacle to the spread of the above-described battery replacement type electric vehicle charging stations. can be

Unexamined Patent Publication No. 10-2019-0046159

An object of the present invention is to provide a battery charging device capable of increasing power transfer efficiency when charging a battery only with a simple power control circuit structure that can be configured at a low unit cost.

An object of the present invention is to provide a battery charging device that can be manufactured at a low cost without using a complex circuit structure and a large number of elements.

Another object of the present invention is to provide a battery charging device capable of reducing a failure rate during operation.

Another object of the present invention is to provide a battery charging device having high power transfer efficiency.

In order to achieve the above object, a battery charging apparatus according to the present invention includes a power supply unit for generating power; a battery unit including a plurality of batteries charged by receiving power generated from the power supply unit and a charging switch connected to each of the plurality of batteries; and a control unit for controlling on/off of the charging switch, wherein the control unit controls on/off of the charging switch to select a battery to which power generated from the power unit is to be transmitted among the plurality of batteries do.

Here, the battery unit includes a plurality of charging modules provided between the power supply unit and the ground and respectively connected in series, the charging module includes a plurality of charging units connected in parallel, and the charging unit includes one battery and the one It may include one charging switch connected to the battery of

In addition, the charging module may further include a bypass switch connected in parallel with the plurality of charging units.

The controller may monitor an output voltage of the power supply and an output current of the power supply, and calculate a voltage of a maximum power operating point according to an external temperature of the battery charging device and an amount of solar radiation supplied to the power supply.

In addition, the control unit monitors the voltage of each of the plurality of batteries, and using the calculated voltage of the maximum power operating point and the monitored voltage of each of the plurality of batteries, power generated from the power supply unit among the plurality of batteries A battery to be transferred may be selected, and a charging switch connected to the selected battery may be turned on.

Meanwhile, the battery unit may further include a control battery for compensating for a difference between the calculated maximum power operating point voltage and voltages across the battery unit.

In addition, the power system according to an embodiment of the present invention may further include a cut-off switch provided between the power supply unit and the battery unit, and when the control unit controls the cut-off switch to be off, the Power is transferred to the battery unit to charge the battery, and when the control unit controls the cut-off switch to be turned on, the power supply unit and the battery unit are cut off so that the battery is not charged.

In addition, the power system according to an embodiment of the present invention may further include a reverse current prevention device provided between the power supply unit and the battery unit to prevent a reverse current from flowing from the battery unit to the power supply unit.

The present invention provides a battery charging device in which a charging unit including a battery and a switch is configured in a matrix structure, thereby providing a battery charging device that can be manufactured at a low cost without using a complex circuit structure and a large number of elements.

In addition, the present invention provides a battery charging device that does not use a large number of devices, thereby reducing the failure rate during operation of the battery charging device.

In addition, the present invention can select a battery that can receive the maximum power from the power supply by controlling the on/off switch according to the state of charge of each battery, so that the power transfer efficiency when charging the battery can be improved.

1A shows a current-voltage (IV) curve according to a temperature change when the amount of insolation is 1 kW/m2.
Figure 1b shows the current-voltage (IV) curve according to the change in insolation when the temperature is 25 °C.
Fig. 2 shows the maximum power operating point in the changed current-voltage (IV) curve.
Figure 3a shows the power-voltage (PV) curve according to the temperature change when the amount of insolation is 1kW/m ^{2 .}
Figure 3b shows the power-voltage (PV) curve according to the change in insolation when the temperature is 25 °C.
4 shows the structure of a power control circuit of a conventional solar power generation system.
5 is a schematic diagram of a battery charging apparatus according to an embodiment of the present invention.
6 shows a state of charge (SOC) corresponding to a battery voltage.
7 illustrates the operation of the battery charging device in the case of a temperature of 75°C and an insolation amount of 1kW/m ^{2 according to an embodiment of the present invention.}
8 illustrates the operation of the battery charging device when the temperature is 0°C and the insolation is 1 kW/m ^{2 according to an embodiment of the present invention.}
9 shows the operation of the battery charging device in the case of a temperature of 25 °C and an insolation amount of 1 kW/m ^{2 according to an embodiment of the present invention.}
10 illustrates the operation of the battery charging device when the temperature is 25°C and the amount of insolation is 200W/m ^{2 according to an embodiment of the present invention.}

Hereinafter, the accompanying drawings are provided by way of example only so that the technical idea of the present invention can be sufficiently conveyed to those of ordinary skill in the art, and the present invention is not limited to the drawings presented below and is embodied in any other form. can be

In addition, the '... Terms such as 'unit' and 'module' mean a unit that processes at least one function or operation, which may be implemented as hardware or software or a combination of hardware and software.

Figure 1a shows the current-voltage (IV) curve according to the temperature change when the amount of insolation is 1kW/m2, and Figure 1b shows the current-voltage (IV) curve according to the change in the amount of insolation when the temperature is 25 °C, Fig. 2 shows the maximum power operating point in the changed current-voltage (IV) curve.

The solar panel used in the solar power generation system of the battery charging station changes its output power according to the amount of insolation and temperature. The performance of the solar panel can be expressed through an I-V curve representing the output current and output voltage that determines the output power, and a P-V curve representing the output power and output voltage.

Referring to FIGS. 1A and 1B , the output voltage and output current curves of the solar cell panel change depending on the amount of insolation and temperature changes and the presence or absence of clouds, dew, and other substances where the solar power generation system is installed, so that the output power is changed. It can be seen that, referring to FIG. 2 , it can be seen that the area of the rectangle formed by the maximum power operating point means the maximum power that can be output from the corresponding IV curve.

Figure 3a shows the power-voltage (PV) curve according to the temperature change when the insolation amount is 1kW/m ² , and Figure 3b shows the power-voltage (PV) curve according to the insolation change when the temperature is 25 °C .

As can be seen in FIGS. 3A and 3B , the conventional power control circuit is an MPPT that varies the input voltage of the converter connected to the output of the solar panel in order to track the maximum power operating point of the PV curve that is changed according to the change in temperature and solar radiation. take control

Here, the MPPT control is a control for maximizing the efficiency of photovoltaic power generation, and it is a control that allows the system to always operate at a maximum power point (MPP) so that power can be used to the maximum.

Various MPPT algorithms such as Perturbation and Obsevation (P&O) method and Incremental Conductance (InCond) method are known as methods for controlling the maximum power operating point tracking control.

4 shows the structure of a power control circuit of a conventional solar power generation system.

In the case of a power control circuit of a conventional solar power generation system installed in an electric vehicle battery charging station, the maximum power using the above-described MPPT algorithm is used to output the maximum power according to the IV curve of the solar panel that is changed according to changes in temperature and solar radiation. It is configured to instantaneously control the operating point.

This power control circuit is a circuit with high precision in outputting the maximum power that can be generated from the solar cell panel. In the case of a power stage through which the power generated from the solar cell panel passes, an input capacitor, an input inductor, a switch, and an output diode , output capacitors, and a total of 6 or more elements of the current/voltage sensing unit are used. In addition, in the case of a control stage that generates a switch control signal by sensing the current and voltage at the input side of the power stage, a maximum power operating point tracking controller, a PI controller, a switch control signal generator, etc. are used.

In addition, in actual use, two circuits of FIG. 4 are interleaved in parallel to reduce output current ripple. That is, in actual use, the element used in the circuit structure of FIG. 4 is doubled.

Table 1 below shows the percentage of solar power installation cost composition surveyed by the Institute of Production Technology in 2015.

Installation cost configuration items Price composition ratio (%) solar panel module 38 Power control circuit and enclosure 17 Junction panel and monitoring device 5 Installation structure and installation work 17 Electrical design and electrical work/lightning/grounding 14 Safety Diagnosis/Supervision 4 management/expense 5 total 100

Referring to Table 1, a complex power control circuit having a large number of elements and a large number of controllers as shown in FIG. 4 accounts for about 17% of the cost of the solar power generation facility.

Table 2 below shows the failure rate of the solar power generation system investigated by the Energy Agency of the Ministry of Economy, Trade and Industry in Japan in 2012.

configuration items Failure rate (%) solar panel module 19 power control circuit 65 junction box One monitoring device 15 total 100

Referring to Table 2, in the photovoltaic power generation system using the power control circuit of FIG. 4 having a large number of elements and a large number of controllers, about 65% of the failure rate is occupied by the power control circuit.

As confirmed in Tables 1 and 2 above, it can be seen that the inclusion of the power control circuit having a complex structure as shown in FIG. 4 in the solar power generation system of the battery charging station is a burden to the user in terms of installation and maintenance costs.

Battery replacement method In the case of electric vehicle charging stations, since the number of batteries and the state of battery charge vary depending on the situation, the solar power generation system that applies the maximum power operating point tracking control method that always has higher precision than necessary by the conventional complex power control circuit structure. Rather than using it, it is necessary to introduce a battery charging device with a circuit that reduces cost and failure rate by simplifying the circuit structure and control method while maintaining the maximum power operating point tracking control performance.

Hereinafter, a battery charging apparatus according to an embodiment of the present invention will be described with reference to FIG. 5 .

Referring to FIG. 5 , the battery charging apparatus according to an embodiment of the present invention includes a power supply unit 1000 , a battery unit 2000 , and a control unit 3000 .

The power supply unit 1000 is a component that generates power, and may be a solar panel that converts light energy into electrical energy, and in this case, the solar panel is a combination of solar cell modules that can convert sunlight into DC power and output it. can be configured. The solar cell module may be formed of a combination of series connection, parallel connection, or series-parallel connection of solar cells.

_{The battery unit 2000 includes a plurality of batteries B ij} charged by receiving power generated from the power supply unit 1000 _{and a charging switch SW ij} connected to each of the plurality of batteries. In this case, 1≤i≤M, 1≤j≤N, and i, j, M, and N are natural numbers.

Here, each battery (B _ij ) is a discharged battery of the electric vehicle, and is a battery left in a charging station after being replaced with a fully charged battery.

In an embodiment of the present invention, the battery is limitedly described as a charging object for power supply of an electric vehicle, but an object that can be charged through the application of current or voltage to a moving object or an electric device containing a charging object such as a fuel cell or battery. It is a concept that includes all

At this time, the _{state of charge (SOC) of each battery B ij} may be different from each other. In some cases, a battery is replaced with a heavily discharged state and a certain battery is replaced with a slightly discharged state. because there is That is, the voltages of each battery B _ij may also be different from each other.

The charging switch (SW _ij ) is connected to the positive terminal of each battery (B _ij ) and connects the connected battery (B _ij ) to the circuit line when operating on, and connects the connected battery (B _ij ) to the circuit line when operating off can be blocked from

At this time, the charging switch SW _ij may be any device as long as it becomes conductive (on state) or non-conduction (off state) to determine whether to flow a current.

More specifically, the battery unit 2000 includes a charging unit (CU _{ij ) consisting of one charging switch (SW ij} ) and one battery (B _ij ), and a plurality of these charging units (CU _ij ) are connected in parallel. The charging module 2100-i constitutes, and the charging modules 2100-i are respectively connected in series and are provided between the power supply unit 1000 and the ground.

Alternatively, the ground may not be connected only to the batteries in the M-th row as shown in FIG. 5 , but all batteries included in the battery unit 2000 may be configured to be connected or disconnected through an additional switch configuration with the ground.

At this time, as can be seen from FIG. 5 , the charging unit CU _ij is in the form of a matrix consisting of M rows and N columns, and the charging unit CU _ij , the battery B _ij ) and the charging switch SW _ij may be sequentially numbered.

For example, the charging unit located in the second column of the third row may be numbered and expressed as _{CU 32} , the battery as B ₃₂ , and the charging switch as SW _{32 .}

The charging module 2100-i includes a plurality of charging units (CU _ij ) connected in parallel in one row. When the charging switch (SW _ij ) included in each charging unit (CU _ij ) is turned on, the charging switch ( a battery (B _ij) is charged with a current to the battery (B _ij) is connected to the SW _ij) flows. _{In this way, one or more batteries B ij to} be charged may be selected from each charging module 2100 - i .

Meanwhile, the charging module 2100 - i may further include a bypass switch 2300 - i connected in parallel to the _{plurality of charging units CU ij .}

Here, the bypass switch 2300 - i is a switch that forms a detour path in order not to charge any battery in the charging module 2100 - i . As can be seen from FIG. 5 , since the bypass switch 2300-i is a switch that is not connected to any battery, when the bypass switch 2300-i is turned on, the charging module including the bypass switch 2300-i In (2100-i), neither battery is connected to the circuit line.

The controller 3000 controls the on/off of the charging switch SW _{ij included in the charging unit CU ij} to receive the power generated from the power supply unit 1000 among the _{plurality of batteries B ij , B ij} ) is a selectable configuration.

More specifically, the control unit 3000 _{monitors the output voltage (V p} ) and the output current (I _p ) of the power supply unit 1000 , and the maximum power according to the temperature outside the battery charging device and the amount of insolation supplied to the power supply unit 1000 . The voltage at the operating point can be calculated.

As described above, in order to track and control the maximum power operating point of the solar panel, the operating point of voltage or current needs to be moved.

In addition, since the operating point and voltage of the operating point that can generate and transmit the maximum power are changed according to the temperature and the amount of insolation, the operating point that can transmit the maximum power is the current according to the temperature and the amount of insolation as shown in FIGS. 1A and 1B- It can be calculated by the voltage (IV) curve.

Therefore, the control unit 3000, the maximum power operation using the temperature outside the battery charging device, the amount of solar radiation supplied to the power supply unit 1000, the output current (I _p ) and the output voltage (V _{p ) output from the power supply unit 1000 .} The voltage at the point can be calculated.

In this case, the controller 3000 may directly monitor the amount of insolation, temperature, output current I _p , and output voltage V _p , or may receive measured values from an external device.

_{In addition, the control unit 3000 monitors the voltage of each of the plurality of batteries B ij} included in the battery unit 2000 , and the voltage of the maximum power operating point calculated above and the monitored plurality of batteries B _ij , respectively. using a voltage to select the battery (B _ij), electric power is delivered is generated from the power supply section 1000 of the plurality of battery (B _ij), and turns on the charging switch (SW _ij) connected to a battery (B _ij), can

Previously, since the voltage of the maximum power transmission operating point was calculated, the controller 3000 monitors the charging voltage V _{ij of each battery B ij} , and then configures a voltage required to transmit the maximum power. Select one or more batteries (B _ij ) and turn on the charging switch (SW _ij ).

At this time, one or more batteries B _ij may be selected for each charging module 2100-i, and the batteries B _ij selected for each charging module 2100-i are connected in series from the power supply unit 1000 to the ground. A power transmission path to be connected is formed.

As described above with reference to FIG. 4 , the power control circuit of the conventional solar power generation system directly changes the output voltage or output current of the solar panel according to the known MPPT algorithm to track the maximum power operating point, thereby operating the maximum power with high precision. track the points

However, although the MPPT control method has high precision, it has to configure a complex circuit structure and requires a large number of elements and controllers, so the manufacturing cost and failure rate are high. If you check the current voltage of the loads (here, it means batteries discharged to different levels) and connect to configure the voltage required for tracking the maximum power operating point, you can achieve similar performance to MPPT control with a simple circuit structure. It is based on the fact that

Meanwhile, in the battery charging apparatus of the present invention, the battery unit 2000 may further include a control battery 2550 for compensating for a difference between the calculated maximum power operating point voltage and the voltage across the battery unit 2000 . .

At this time, the control battery 2550 _{is not used to be provided to the user after charging like other batteries B ij} , but the difference between the voltage at the maximum power operating point and the voltage across the battery unit 2000 is within a predetermined error range. As a configuration that serves to compensate for satisfaction, any charging unit CU _ij included in each charging module 2100 - i may include a control battery 2550 .

For example, as shown in FIG. 5 , the control battery 2550 may be included in the charging unit 2500 located in the N-th column of the first charging module 2100-1.

The power control circuit of the conventional photovoltaic power generation system may have a section in which it cannot operate at all due to insufficient voltage gain at a very low output voltage output in cloudy and cloudy weather with little insolation.

However, in the present invention, the voltage of the control battery 2500 that supplies the voltage necessary to configure the maximum power operating point voltage is preset to be similar to the voltage output by the power supply unit 1000 in cloudy weather, so that the power supply unit ( 1000) output power can be obtained.

In addition, the battery charging apparatus of the present invention may further include a cut-off switch 4000 provided between the power supply unit 1000 and the battery unit 2000 .

Here, when the control unit 3000 controls the cutoff switch 4000 to be off, as described above, the power generated from the power supply unit 1000 through the on/off control _{of the charging switch SW ij by the control unit 3000 is} It is transferred to the battery unit 2000 and the battery B _{ij in which the charging switch SW ij} is turned on is charged.

Conversely, when the control unit 3000 controls the cut-off switch 4000 to be on, the current output from the power supply unit 1000 flows to the ground through the cut-off switch 4000, so the power supply unit 1000 and the battery unit 2000) is cut off, power supply from the power supply unit 1000 to the battery unit 2000 is stopped, so that charging can be simply cut off.

At this time, the cut-off switch 4000 is a device that determines whether to flow a current by conducting (on state) or non-conducting (off state). For example, a metal oxide semiconductor field effect transistor (MOSFET) as a semiconductor switch is used. may be, but is not limited thereto.

In addition, the battery charging device of the present invention is provided between the power supply unit 1000 and the battery unit 2000, the reverse current preventing element 5000 for preventing the reverse current from flowing from the battery unit 2000 to the power supply unit 1000. may include more.

Here, the reverse current prevention device 5000 may be a diode as shown in FIG. 5 , but is not limited thereto.

Hereinafter, a more specific example of the battery charging device of the present invention will be described with reference to FIGS. 6 to 10 .

6 illustrates a state of charge (SOC) corresponding to a battery voltage.

Here, FIG. 6 is only for helping the understanding of the specific embodiment described in FIGS. 7 to 10, and it is clear to those skilled in the art that the SOC for each battery picture may be different depending on the battery manufacturer. am.

7 to 10, for convenience, the battery unit 2000 configured in the form of a matrix of 3 rows and 7 columns (M=3, N=7) will be described as an example. At this time, although the cut-off switch 4000 and the reverse current prevention device 5000 are illustrated in FIGS. 7 to 10 , this is not an essential configuration, and the embodiment of the present invention includes the power supply unit 1000, the battery unit 2000 and the control unit ( 3000 (not shown in FIGS. 7 to 10) may be configured.

In addition, although it is illustrated that the ground is connected only to the batteries in the last row of the battery unit 2000 having a matrix structure in FIGS. 7 to 10 , all batteries included in the battery unit 2000 are connected to the ground and ground through an additional switch configuration. It may also be configured to connect or block.

7 illustrates the operation of the battery charging device in the case of a temperature of 75°C and an insolation amount of 1kW/m ^{2 according to an embodiment of the present invention.}

Referring to FIG. 7 , when the external temperature of the battery charging device is 75°C and the amount of solar radiation supplied to the power supply unit 1000 is 1kW/m ² , it can be seen that the voltage at the maximum power operating point is about 325V.

Control unit 3000 is, since each of both the SOC of the battery (B _ij) monitor, it is possible to select a battery (B _ij) that can be created close to the voltage across the battery unit (2000) to the maximum 325V. Here, as close as possible may mean that a preset error range is satisfied.

The control unit 3000 receives the output voltage and output current of the power supply unit 1000, calculates the maximum power operating point according to the external temperature of the battery charging device and the amount of solar radiation supplied to the power supply unit 1000, and the current voltage is 300V battery ( B ₁₃ ) can be selected. Then, the controller 3000 turns on the charging switch SW _{13 connected to the selected battery B 13} , and the bypass switches 2300-2,2300- of the remaining charging modules 2100-2,2100-3 3) is turned on to form a power transmission path as shown in FIG. 7 .

At this time, the control unit 3000 is in a state in which the cutoff switch 4000 is turned off.

8 illustrates the operation of the battery charging device when the temperature is 0°C and the insolation is 1 kW/m ^{2 according to an embodiment of the present invention.}

Referring to FIG. 8 , when the external temperature of the battery charging device is 0°C and the amount of solar radiation supplied to the power supply unit 1000 is 1kW/m ² , it can be seen that the voltage at the maximum power operating point is about 475V.

As shown in FIG. 8 , the controller 3000 may _{select two batteries B 25} , B ₃₁ having a current voltage of 240V to make the voltage across the battery unit 2000 480V. Then, the control unit 3000 turns on the charging switches SW ₂₅ , SW _{31 connected to the selected batteries B 25} , B ₃₁ , and the bypass switch 2300-1 of the remaining charging module 2100-1. By turning on the power transmission path as shown in FIG. 8 can be formed.

At this time, the control unit 3000 is in a state in which the cutoff switch 4000 is turned off.

9 shows the operation of the battery charging device in the case of a temperature of 25 °C and an insolation amount of 1 kW/m ^{2 according to an embodiment of the present invention.}

Referring to FIG. 9 , when the external temperature of the battery charging device is 25°C and the amount of solar radiation supplied to the power supply unit 1000 is 1 kW/m ² , it can be seen that the voltage at the maximum power operating point is about 425V.

As shown in FIG. 9 , the controller 3000 may _{select a battery B 11} having a current voltage of 180V and a battery B ₃₁ having a current voltage of 240V to set the voltage across the battery unit 2000 to 420V. Thereafter, the control unit 3000 turns on the charging switches SW ₁₁ , SW _{31 connected to the selected battery B 11} , B ₃₁ , and the bypass switch 2300-2 of the remaining charging module 2100-2. By turning on the power transmission path as shown in FIG. 9 can be formed.

At this time, the control unit 3000 is in a state in which the cutoff switch 4000 is turned off.

10 illustrates the operation of the battery charging device when the temperature is 25°C and the amount of insolation is 200W/m ^{2 according to an embodiment of the present invention.}

Referring to FIG. 10 , when the external temperature of the battery charging device is 25°C and the amount of solar radiation supplied to the power supply unit 1000 is 200W/m ² , it can be seen that the voltage at the maximum power operating point is about 400V.

As shown in FIG. 10 , the controller 3000 may _{select a battery B 27} having a current voltage of 390V and make the voltage across the battery unit 2000 to 390V. Thereafter, the controller 3000 turns on the charging switch SW _{27 connected to the selected battery B 27} , and the bypass switches 2300-1, 2300- of the remaining charging modules 2100-1,2100-3 3) is turned on to form a power transmission path as shown in FIG. 10 .

At this time, the control unit 3000 is in a state in which the cutoff switch 4000 is turned off.

As described above, according to the present invention, by presenting a battery charging device comprising a charging unit including a battery and a switch in a matrix structure, a battery charging device that can be manufactured at a low cost without using a complex circuit structure and a large number of elements is provided. It is possible to reduce the failure rate during operation of the battery charging device by providing a battery charging device that does not use a large number of elements.

In addition, the present invention can select a battery that can receive the maximum power from the power supply by controlling the on/off switch according to the state of charge of each battery, so that the power transfer efficiency when charging the battery can be improved.

In addition, in the power control circuit structure using the conventional MPPT, a power conversion loss of about 5% occurs due to the loss of the converter included in the circuit structure, but in the present invention, only a diode is included as a reverse current prevention device in the power transmission path, or , or other circuit elements are not included in the power transmission path, so that loss during power transmission can be minimized.

This is because even if the battery charging device configured with the matrix structure according to the present invention does not precisely control the voltage value of the maximum power operating point as in the conventional power control circuit structure for performing MPPT control, the power conversion efficiency is higher, so that the final output power is It means it could be bigger.

The embodiments given as examples for the purpose of description of the present invention are merely one embodiment in which the present invention is embodied, and combinations are possible in various forms in order to realize the gist of the present invention. Therefore, the present invention is not limited to the above embodiments, and as claimed in the claims below, anyone with ordinary skill in the art to which the invention pertains can implement various modifications without departing from the gist of the present invention. It will be said that there are technical features of the present invention to the extent.

1000: power supply
2000: battery unit
2100-i : charging module
CUij : Charging unit
Bij: battery
SWij: charging switch
2500: charging unit
2550: battery for control
2300-i : Bypass switch
3000: control
4000: disconnect switch
5000: reverse current prevention device

Claims (8)

a power supply unit for generating power;
a battery unit including a plurality of batteries charged by receiving power generated from the power supply unit and a charging switch connected to each of the plurality of batteries; and
Including; a control unit for controlling the on-off of the charging switch;
The control unit selects a battery to which power generated from the power supply unit is to be transmitted among the plurality of batteries by controlling on/off of the charging switch,
By monitoring the output voltage of the power supply and the output current of the power supply, calculating the voltage of the maximum power operating point according to the temperature outside the battery charging device and the amount of solar radiation supplied to the power supply,
The voltage of each of the plurality of batteries is monitored, and a battery to which power generated from the power supply unit is to be transmitted is selected from among the plurality of batteries using the calculated voltage of the maximum power operating point and the monitored voltage of each of the plurality of batteries. and turning on a charging switch connected to the selected battery. According to claim 1,
The battery unit,
and a plurality of charging modules provided between the power supply unit and the ground and connected in series, respectively,
The charging module includes a plurality of charging units connected in parallel,
The charging unit comprises one battery and one charging switch connected to the one battery. 3. The method of claim 2,
The charging module is
The battery charging device further comprising a bypass switch connected in parallel with the plurality of charging units. delete delete According to claim 1,
The battery unit,
The battery charging device further comprising a control battery for compensating for a difference between the calculated maximum power operating point voltage and the voltage across the battery unit. According to claim 1,
Further comprising a cut-off switch provided between the power supply unit and the battery unit,
When the control unit controls the cut-off switch to be off, the power generated from the power supply unit is transferred to the battery unit to charge the battery,
When the control unit controls the cut-off switch to be on, the power supply unit and the battery unit are cut off so that the battery is not charged. a power supply unit for generating power;
a battery unit including a plurality of batteries charged by receiving power generated from the power supply unit and a charging switch connected to each of the plurality of batteries;
a control unit for controlling on/off of the charging switch; and
a reverse current prevention device provided between the power supply unit and the battery unit to prevent a reverse current from flowing from the battery unit to the power supply unit;
The control unit is
By controlling on/off of the charging switch, selecting a battery to which power generated from the power supply unit is transmitted among the plurality of batteries,
By monitoring the output voltage of the power supply and the output current of the power supply, calculating the voltage of the maximum power operating point according to the temperature outside the battery charging device and the amount of solar radiation supplied to the power supply,
The voltage of each of the plurality of batteries is monitored, and a battery to which power generated from the power supply unit is to be transmitted is selected from among the plurality of batteries using the calculated voltage of the maximum power operating point and the monitored voltage of each of the plurality of batteries. and turning on a charging switch connected to the selected battery.

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