KR20220151267A - Method of charging conversion and devices of self-power generation systems equipped with multiple charging stations - Google Patents

Abstract

The present invention relates to a method and an apparatus for switching charging of a self-power generation system which applies at least two or more rechargeable batteries to a self-power generation device having a power generation means such as a solar cell module, a wind power generation, a wave power generation, and a tidal power generation, and which compares and determines a charging current for each rechargeable battery to select and charge a rechargeable battery having a fast charging order, thereby preventing overcharging or over-discharging and achieving more stable and effective charging without reduction in life span or an explosion accident. The apparatus according to the present invention comprises: a power generation means for generating power; a charging control unit for stabilizing the power generated by the power generation unit, and then charging a rechargeable battery selected from a plurality of rechargeable batteries; a current sensor for sensing a charging current of the plurality of rechargeable batteries; a charging switch unit for comparing the sensed current with a reference current set in the charging control unit and selecting one of the plurality of rechargeable batteries, which has a fast charging order; and a switch unit for charging the selected battery by connecting the charging control unit to the selected battery.

Description

Method of charging conversion and devices of self-power generation systems equipped with multiple charging stations

The present invention relates to a charge switching method and apparatus for a self-generation system equipped with a plurality of rechargeable batteries, and more particularly, by comparing and monitoring the charging currents of the plurality of rechargeable batteries provided in the self-power generation system, but automatically selecting a rechargeable battery having a higher charging order. By allowing charging to take place, overcharging or overdischarging is prevented, and more stable and efficient charging is achieved without shortening of life or explosion.

In general, if you want to use a system (or device) that requires power in an unpowered area where commercial power is not supplied, mainly solar cell modules (solar cells) and/or wind power generators (or wind power and / or tidal power generation) to obtain power and then charge it to a rechargeable battery (Charging Battery) to have a self-powered power device (self-powered device), and also to prepare for emergencies or shutdowns, buildings or facilities of a certain size or more and facilities are obliged to have self-generating devices.

A lead acid battery or a lithium ion battery is mainly used as the charging battery of the self-generating device, and when charging and discharging with one rechargeable battery is repeated, the charging efficiency is lowered and the life of the rechargeable battery is rapidly shortened. If the rechargeable battery explodes due to overcharging, etc., there are various problems such as not only human casualties but also system shutdown due to power outage.

The problem to be solved by the present invention is to compare and monitor the charging current of multiple rechargeable batteries provided in a self-power generation system, but automatically select a rechargeable battery with a fast charging priority so that overcharging or overdischarging is prevented, and life is shortened or exploded. An object of the present invention is to provide a charging conversion method and device for a self-power generation system having a plurality of rechargeable batteries capable of achieving stable and efficient charging.

In the present invention, the charge switching device of a self-generation system equipped with a plurality of rechargeable batteries stabilizes the electric power produced by the electric power generating means and the electric power generating means, and then charges the rechargeable battery selected from among the plurality of rechargeable batteries. A charge control unit that detects the charging current of multiple rechargeable batteries, a current sensor that detects the charging current of the plurality of rechargeable batteries, and a charge switching unit that compares the current detected by the current sensor with the reference current set in the charging control unit and selects one of the plurality of rechargeable batteries with a higher charging order. and a switching unit for connecting the charging control unit to the selected rechargeable battery so that charging is performed.

The present invention is connected to a rechargeable battery A, which is charged by supplying charging power by a relay connected to a transistor connected to the first output terminal of the charge switching unit and performing a switching operation, and a transistor connected to the second output terminal of the charging switching unit. It includes a rechargeable battery B, which is charged by supplying charging power by a switching relay, and a current sensor that senses the charging current of the rechargeable batteries A and B and inputs them to the charging conversion unit.

The present invention relates to a transistor (Q1) connected to the first output terminal (OP1) of the charge switching unit, a relay (Ry1) connected to the transistor (Q1) for a switching operation, and switching on (ON) of the relay (Ry1). A rechargeable battery A, which is supplied and charged by charging power, a transistor Q2 connected to the second output terminal OP2 of the charge conversion unit, a relay Ry2 connected to the transistor Q2 and operating a switching operation, and a relay ( It includes a rechargeable battery B, which is charged by supplying charging power by switching on of Ry2), and a current sensor that senses the charging current of the rechargeable batteries A and B and inputs them to the charging conversion unit.

The present invention relates to a rechargeable battery A, which is charged by supplying charging power by an FET connected to a photocoupler connected to the first output terminal of the charge switching unit and performing a switching operation, and a photocoupler connected to the second output terminal of the charging switching unit. It includes a rechargeable battery B, which is charged by supplying charging power by a FET that is connected and operated by switching, and a current sensor that senses the charging current of the rechargeable batteries A and B and inputs the charged current to a charging conversion unit.

According to the present invention, a photocoupler (PC1) connected to the first output terminal (OP1) of the charge switching unit, a FET (Q3) connected to the photocoupler (PC1) and operating a switching operation, and switching on of the FET (Q3) A rechargeable battery A, which is charged by supplying charging power, a photocoupler (PC2) connected to the second output terminal (OP2) of the charge switching unit, a FET (Q4) connected to the photocoupler (PC2) and performing a switching operation, and a FET It includes a rechargeable battery B, which is charged by supplying charging power by switching on of Q4, and a current sensor that senses the charging current of the rechargeable batteries A and B and inputs them to the charging conversion unit.

The present invention includes a Burden resistor connected in parallel to the current sensor.

The rechargeable battery charge conversion method of the present invention includes the steps of a) inputting and storing the charging current of rechargeable battery A measured by applying charging power to rechargeable battery A to the charging conversion unit, b) charging battery B measured by applying charging power to rechargeable battery B Step of inputting and storing the charging current in the charging conversion unit, c) stopping charging if the charging current values of the rechargeable batteries A and B input to the charging switching unit are overcurrent, d) charging the rechargeable batteries A and B input to the charging switching unit If the current value is not overcurrent, comparing the charging current values of rechargeable battery A and rechargeable battery B, e) if the charging current value of rechargeable battery A is less than the charging current value of rechargeable battery B, charging battery B, and charging battery A is If the charging current value of rechargeable battery B is exceeded, charging battery A; f) If the charging current of rechargeable batteries A and B exceeds 50 mA, continue charging; Including moving steps.

The present invention compares and monitors the charging current of multiple rechargeable batteries A and B provided in a self-generating device with a current sensor (CT), but automatically selects a rechargeable battery with a fast charging priority to ensure constant charging, thereby preventing overcharging or overdischarging. It is prevented, and more stable and efficient charging is achieved without shortening of life or explosion accidents, and even if one of the batteries is defective, operating power is always supplied, so there is an effect that does not affect the operating system at all.

The present invention uses a plurality of rechargeable batteries A and B to maintain a constant state of charge, so that even if they are not charged from the solar cell module 2 for a considerable period of time due to a rainy season or rainy season, a plurality of charged batteries A and B are selected and It is a very useful invention that has effects such as being able to continuously receive system operating power.

1: A circuit block diagram of a charge switching device shown as an example of the present invention.
2: A circuit diagram of a charge switching device shown as an example of the present invention.
3: A circuit diagram of a charge switching device shown as another example of the present invention.
Figure 4: a flow chart of a charging conversion method shown as an example of the present invention.
Figure 5: A flow chart of a charging conversion method shown as an example of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the embodiments of the present invention, the same components in the drawings are described with the same reference numerals as much as possible, and specific descriptions of related well-known configurations or functions are omitted so as not to obscure the subject matter of the present invention. In addition, the accompanying drawings Matters expressed in may be different from the form actually implemented in the drawings schematically for easily explaining the embodiments of the present invention.

1 illustrates the configuration of a charge switching device 1 of the self-powered power system of the present invention. In the present invention, for convenience of description, the solar cell module 2 is taken as an example as a power generation means, but it can be applied to wind power generators, wave power generators, tidal power generators, and other various power generation devices, of course. Of course, it can also be applied to a self-generating system in which these generators are combined. And in the case of a rechargeable battery, a comparative description is made of a rechargeable battery A and a rechargeable battery B, but of course it can be composed of more than one.

The charge switching device 1 of the self-generation system of the present invention includes a solar cell module 2 in which power is generated by sunlight, and a constant voltage unit 8 and a constant current unit ( 9), a charging control unit (3) that automatically charges the batteries selected from among the batteries A and B after stabilization, a current sensor (CT) for detecting (detecting) the charging current of the batteries A and B, respectively, and a current sensor The current detected by (CT) is compared with the reference current set in the charging control unit 3, but the charging switching unit 5 selects one of the plurality of rechargeable batteries A and B with the highest charging order, and the charging control unit with the selected battery. It includes a switching unit 4 that connects (switches) (3) so that charging is made.

The charge control unit 3 includes a constant voltage unit 8 and a constant current unit 9 that stabilize the irregular voltage and current applied from the solar cell module 2, a micro controller unit (MCU), and a memory unit.

Examples of the plurality of rechargeable batteries A and B include secondary batteries such as lead storage batteries and lithium ion batteries.

The current sensor (CT) senses (detects) the charging current of the plurality of rechargeable batteries A and B and inputs it to the charging conversion unit 5, and may be a Hall IC, current sensor, ammeter, current transformer, or the like.

The switching unit 4 configures (connects) a charging circuit so that charging power can be supplied to the rechargeable battery according to the rechargeable battery selection signal output from the charging switching unit 5, and a relay or FET (Field Effective Transistor) ) and so on.

The charge switching unit 5 compares and determines the currents of the rechargeable batteries A and B input from the current sensor CT, selects a rechargeable battery having the highest charging order among the plurality of rechargeable batteries A and B, and then outputs a selection signal, The unit 4 configures a charging circuit by connecting one rechargeable battery and the charging control unit 3 according to the selection signal, so that the corresponding rechargeable battery is charged.

The present invention is connected to the transistor connected to the first output terminal of the charge switching unit 5 and is connected to the battery A to be charged by supplying charging power by switching on of a relay that performs a switching operation, and the charging switching unit ( The charging power is supplied by switching ON of the relay connected to the transistor connected to the second output terminal of 5) and detects the charging current of the rechargeable battery B and the rechargeable batteries A and B to be charged to the charging conversion unit. Includes a current sensor for input.

The present invention relates to a rechargeable battery A, which is charged by supplying charging power by an FET connected to a photocoupler connected to the first output terminal of the charge switching unit 5 and switching on (ON), and the charging switching unit 5 ) is connected to the photocoupler connected to the second output terminal of the battery B, which is charged by supplying charging power by a FET that switches on (ON), and the charging current of the rechargeable batteries A and B is detected and input to the charging conversion unit It includes a current sensor that

2 is a circuit configuration diagram of a charge switching device 1 configured to selectively charge one of a plurality of rechargeable batteries A and B using a relay, which is a switching element, and the first output terminal of the charging switching unit 5 The current limiting resistor (R1) and the base of the transistor (Q1) are sequentially connected to (OP1), the emitter of the transistor (Q1) is connected to the (-) power line, and +Vcc power is supplied to the collector of the transistor (Q1) The excitation coil of the relay (Ry1) is connected, the movable terminal of the relay (Ry1) is connected to the charging power supply line (3a) of the charging control unit (3), and the a contact of the relay (Ry1) is (+) of the rechargeable battery A terminal is connected, and the (-) terminal of rechargeable battery A is connected to the (-) power line.

The current limiting resistor R2 and the base of the transistor Q2 are sequentially connected to the second output terminal OP2 of the charge switching unit 5, and the emitter of the transistor Q2 is connected to a (-) power line, The excitation coil of the relay Ry2 to which +Vcc power is supplied is connected to the collector of the transistor Q2, the movable terminal of the relay Ry2 is connected to the charging power supply line 3a of the charging control unit 3, and the relay ( The (+) terminal of rechargeable battery B is connected to the a contact of Ry2), and the (-) terminal of rechargeable battery B is connected to the (-) power line.

A current sensor (CT) is installed adjacent to the charging power supply line (3a) to detect (detect) the charging current, and a Burden resistor (R3) is connected in parallel at both ends of the current sensor (CT), and the current sensor (CT) is connected in parallel. One end of the sensor CT is supplied with a voltage divided by resistors R4 and R5, and the other end of the current sensor CT is connected to the input of the charging conversion unit 5 to input the sensed charging current.

The current sensor (CT) is a kind of separate magnetic field detection sensor and measures the current by measuring the voltage at both ends of a Burden resistor (R3) connected in parallel.

The charging current input to the input terminal (IN) of the charging switching unit (5) by the current sensor (CT) is compared with the reference current previously set and stored in the memory unit (10) of the charging switching unit (5). Among the plurality of rechargeable batteries A and B, if a rechargeable battery with a higher charging priority is selected, for example, a rechargeable battery that needs to be charged first than other rechargeable batteries is selected and a selection signal is output, the corresponding transistor is turned on and the relay is switched on to charge the corresponding rechargeable battery. Charging is performed when power is applied.

3 is a circuit configuration diagram of a charge switching device 1a configured to selectively charge one of a plurality of rechargeable batteries A and B using an active switching element FET, and shows the first output terminal OP1 of the charge switching unit 5 ) is connected to the current limiting resistor (R6) and the light emitting element of the photocoupler (PC1), and to the light receiving element of the photocoupler (PC1) to which +Vcc power is supplied, the resistor (R8) and the gate of the FET (Q3) are connected. , The (-) terminal of the rechargeable battery A is connected to the drain of the FET (Q3), and the (+) terminal of the rechargeable battery A is connected to the charging power supply line (3a) of the charging control unit (3).

A current limiting resistor (R7) and a light emitting element of the photo coupler (PC2) are connected to the second output terminal (OP2) of the charge switching unit (5), and a light receiving element of the photo coupler (PC2) to which +Vcc power is supplied is connected. The resistor (R9) and the gate of the FET (Q4) are connected, the (-) terminal of the rechargeable battery B is connected to the drain of the FET (Q4), and the (+) terminal of the rechargeable battery B is the charging power supply line of the charging control unit (3). (3a) is connected.

The charging current input to the charging switching unit 5 by the current sensor CT is compared with the reference current previously set and stored in the memory unit 10 of the charging switching unit 5, and the charge switching unit 5 selects a rechargeable battery with a faster charging order among a plurality of rechargeable batteries A and B, for example, a rechargeable battery that needs to be charged first than other rechargeable batteries, and outputs a selection signal. When applied, charging is performed.

A current sensor (CT) is installed adjacent to the charging power supply line (3a) to detect (detect) the charging current, and a Burden resistor (R3) is connected in parallel at both ends of the current sensor (CT), and the current sensor (CT) is connected in parallel. One end of the sensor CT is supplied with a voltage divided by resistors R4 and R5, and the other end of the current sensor CT is connected to the input of the charging conversion unit 5 to input the sensed charging current.

A Burden resistor R3 connected in parallel to the current sensor CT is a resistor that amplifies a minute amount of current, and the output voltage Vout is obtained as shown in (Equation 1) below.

Vout = Current × Resistance ------------------------------------- (Equation 1)

The resistance R3 is a reference resistance and has the same resistance value.

In the current sensor (CT) in the present invention, fine fluctuations of the AC current may occur due to the flowing current, but after being amplified to an appropriate size by the Burden resistor (R3), the voltage divider resistor (R4) (R5) standardizes the fluctuation. voltage is determined. That is, when a voltage of +5V is supplied to the voltage dividing resistor R4, a reference voltage of +2.5V, which is half of +5V, is obtained by the other voltage dividing resistor R5.

The photocouplers (PC1) (PC2) protect their peripheral circuits by electrically insulating the high voltage and high current areas of rechargeable batteries A and B and the low voltage and low current area of the charge conversion unit 5, and block overcurrent, surge voltage, etc., Compared to the relay Ry1, there is an advantage in that the switching speed is faster.

The FETs (Q3) and (Q4) are preferably implemented as insulated gate type field effect transistors (Metal Oxide Semiconductor Field Effect Transistors, MOSFETs) having excellent durability among field effect transistors (FETs).

If the current detected by the current sensor CT2 is an analog signal, it is converted into a digital signal by an AD converter (not shown) and then stored in the memory unit 10. Even after charging of the selected rechargeable battery starts, the current sensor periodically (CT) reads the current to check how much charging has progressed. For example, when the charging current drops below 10 mA, it is determined that the charging is almost completed, and the charging switching unit 5 selects another rechargeable battery, and the other rechargeable battery is connected by a switching element (relay, FET) to perform charging.

As shown in FIG. 4, the rechargeable battery charging conversion method of the present invention includes the steps of a) applying charging power to rechargeable battery A and inputting and storing the measured charging current of rechargeable battery A to the charging conversion unit, b) applying charging power to rechargeable battery B Step of inputting and storing the measured charging current of rechargeable battery B in the charging conversion unit, c) stopping charging if the charging current values of rechargeable batteries A and B input to the charging conversion unit are overcurrent, d) charging battery A input to the charging conversion unit , Comparing the charging current values of rechargeable battery A and rechargeable battery B if the charging current value of B is not overcurrent, e) If the charging current value of rechargeable battery A is less than the charging current value of rechargeable battery B, charging battery B, and charging battery A If the charging current value exceeds the charging current value of rechargeable battery B, charging rechargeable battery A; f) If the charging current of rechargeable batteries A and B exceeds 50 mA, continue charging; moving to step a).

5 is a flow chart of a rechargeable battery charge switching method shown as an example of the present invention, in a state in which a reference value for charge comparison is stored in the memory unit 10 of the charge switching unit 5, charging currents of rechargeable batteries A and B are compared to charge the order. As a method of selecting and charging the fast (requiring charging first) rechargeable battery, the rechargeable battery is charged alternately according to the charging order while monitoring the charging current.

That is, "H" is output to the first output terminal (OP1) of the charge switching unit (5) and "L" is output to the second output terminal (OP2) in order to check the charging current charged in the rechargeable battery A, When the transistor Q1 is turned on and the movable terminal of the relay Ry1 is connected to the contact a, charging power is supplied to the rechargeable battery A through the charging power line 3a (step S1), and the charging power A current sensor (CT) close to the line (3a) measures (senses) the charging current of the rechargeable battery A, and then inputs it to the input terminal (IN) of the charge conversion unit (5) and stores it in the memory unit (10) (S2 step).

Next, in order to check the charging current charged in the rechargeable battery B, "H" is output to the second output terminal (OP2) of the charge switching unit (5) and "L" is output to the first output terminal (OP1), and the transistor As (Q2) is turned on and the movable terminal of the relay (Ry2) is connected to the contact a, the charging power of the charging control unit (3) is supplied to the rechargeable battery B through the charging power line (3a). (step S3), the current sensor (CT) close to the charging power line (3a) measures (sensing) the charging current of the rechargeable battery B, and then inputs it to the input terminal (IN) of the charging conversion unit (5) to the memory unit. It is stored in (10) (step S4).

The charging conversion unit 5 stops charging the rechargeable batteries A and B (step S6) when the input charging current values of the rechargeable batteries A and B exceed the set overcurrent of 10A (step S5), and If the charging current value of is not an overcurrent of less than 10A, compare the charging current values of rechargeable battery A and rechargeable battery B, but if the charging current value of rechargeable battery A is less than the charging current value of rechargeable battery B (step S7), the charging switching unit 5 2 "H" is output through the output terminal (OP2), the transistor (Q2) is turned on, and the operating terminal of the relay (Ry2) is connected to the contact a, and the battery A through the charging power line (3a). Since the charging power is supplied to, the rechargeable battery B is charged (step S8), and if the charging current of the rechargeable battery B exceeds the set 50 mA, it continues to charge, and if the charging current of the rechargeable battery B does not exceed the set 50 mA, it is fully charged ( full charge) (step S9) and moves to the first step (step S1).

In addition, when the charging current values of the rechargeable battery A and the rechargeable battery B are compared, but the charging current value of the rechargeable battery A exceeds the charging current value of the rechargeable battery B (step S7), the first output terminal (OP1) of the charging switching unit (5) By outputting "H", the transistor (Q1) is turned on, and the movable terminal of the relay (Ry1) is connected to the contact a, and charging power is supplied to the rechargeable battery A through the charging power line (3a), so that the rechargeable battery If A is charged (step S10), and the charging current of rechargeable battery A exceeds the set 50 mA, it continues to be charged, and if the charging current of rechargeable battery A does not exceed the set 50 mA, it is judged as full charge ( Step S11) Moves to the first step (step S1) and repeats the above charging process, so that the batteries A and B are alternately charged according to the order in which they are charged. Since it is supplied stably at all times, there is an effect that does not affect system operation at all.

In the present invention, when a photocoupler and an FET are used instead of the transistor Q1 and the relay Ry1 as shown in FIG. 3, the first output terminal OP1 of the charge switching unit 5 is used to check the charging current charged in the rechargeable battery A. ), "H" is output, and "L" is output to the second output terminal (OP2), while the photocoupler (PC1) and FET (Q3) are turned on and switched on Since the (-) terminal of the rechargeable battery A is connected to the (-) power line and the (+) terminal of the rechargeable battery A is always connected to the charging power line (3a) of the charging control unit (3), charging power is supplied to the rechargeable battery A ( Step S1), the current sensor (CT) adjacent to the charging power line (3a) measures (sensing) the charging current of the rechargeable battery A, and then inputs it to the input terminal (IN) of the charging conversion unit (5) to the memory unit (10). ) is stored (step S2).

Next, in order to check the charging current charged in the rechargeable battery B, "H" is output to the second output terminal (OP2) of the charge switching unit (5) and "L" is output to the first output terminal (OP1). As the coupler (PC2) and FET (Q4) are turned on and switched on, the (-) terminal of rechargeable battery B is connected to the (-) power line and the (+) terminal of rechargeable battery B is charged Since the charging power line 3a of the control unit 3 is always connected, charging power is supplied to the rechargeable battery B (step S3), and the current sensor CT close to the charging power line 3a measures the charging current of the rechargeable battery B. After measuring (sensing), it is input to the input terminal (IN) of the charging conversion unit 5 and stored in the memory unit 10 (step S4).

The charging conversion unit 5 stops charging the rechargeable batteries A and B (step S6) when the input charging current values of the rechargeable batteries A and B exceed the set overcurrent of 10A (step S5), and If the charging current value of is less than 10A and is not an overcurrent, compare the charging current values of rechargeable battery A and rechargeable battery B, but if the charging current value of rechargeable battery A is less than the charging current value of rechargeable battery B (step S7), 2 “H” is output through the output terminal (OP2), the photocoupler (PC2) and FET (Q4) are turned on, and the battery B is charged (step S8) as the switching is turned on. If the charging current of B exceeds the set 50 mA, charging continues, and if the charging current of rechargeable battery B does not exceed the set 50 mA, it is judged as full charge (step S9) and returns to the first step (step S1). to be moved

In addition, when the charging current values of the rechargeable battery A and the rechargeable battery B are compared, but the charging current value of the rechargeable battery A exceeds the charging current value of the rechargeable battery B (step S7), the first output terminal (OP1) of the charging switching unit (5) " By outputting H", the photocoupler (PC1) and the FET (Q3) are turned on and switched on to charge the battery A (step S10), and the charging current of the battery A is set to 50 mA. If the state exceeds , it is continuously charged, and if the charging current of the rechargeable battery A does not exceed the set 50 mA, it is determined as full charge (step S11) and moves to the first step (step S1) to repeat the charging process. Therefore, the alternating charging of the rechargeable batteries A and B is achieved, and therefore, since the operating power is stably supplied to the system using the charging power of the rechargeable batteries A and B, there is an effect that does not affect the operation of the system at all.

The charging control unit 3 charges the selected (switched) rechargeable battery among rechargeable batteries A and B selected by the charging switching unit 5 while controlling the charging current and charging voltage, and the charging of the entire rechargeable battery is fully charged (full charge). ), charging is stopped, and if charging by electricity consumption or discharging is required, charging is measured according to the flow process of FIG. 4 .

The present invention compares and monitors the charging current of multiple rechargeable batteries A and B provided in a self-generating device with a current sensor (CT), but automatically selects a rechargeable battery with the highest charging priority and continuously charges, so that the rechargeable batteries A and B are charged. Efficiency is improved, overcharging or overdischarging is prevented, and more stable and efficient charging is achieved without shortening of life or explosion.

In the present invention, since at least two or more plurality of rechargeable batteries are continuously charged according to the charging order and the power supply state is maintained at all times, even if they are not charged from the solar cell module 2 for a considerable period of time due to rainy season or rainy season, the plurality of rechargeable batteries that are charged It can be used continuously by selecting A or B, and even if one battery is defective, operating power is always supplied through the other battery, so there is an advantage that the system operation is not affected at all.

The present invention described above is not limited to the present embodiment and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope without departing from the technical spirit of the present invention, which is in the technical field to which the present invention belongs. It is self-evident to those skilled in the art.

(1)(1a)--charge conversion device (2)--solar cell module
(3)--charging control unit (4)--switching unit
(5)-Charging conversion part (8)-Constant voltage part
(9)--constant current part (10)--memory part
(A)(B)--rechargeable battery (CT)--current sensor
(Q1)(Q2)--Transistor (Q3)(Q4)--FET
(R)--resistance (Ry1)(Ry2)--relay
(PC1)(PC2)--Photocoupler

Claims (5)

power generation means;
a charging control unit that stabilizes the power generated by the power generating means and then charges the selected rechargeable battery from among a plurality of rechargeable batteries;
a current sensor for sensing charging current of multiple rechargeable batteries;
a charge switching unit that compares the current sensed by the current sensor with the reference current set in the charging control unit and selects one of the plurality of rechargeable batteries with a higher charging order;
a switching unit that connects the charging control unit to the selected rechargeable battery so that charging is performed;
Charge switching device of a self-powered power generation system provided with a plurality of rechargeable batteries comprising a. The method of claim 1,
A rechargeable battery A that is charged by supplying charging power by a relay connected to a transistor connected to a first output terminal of the charging conversion unit and performing a switching operation;
a rechargeable battery B supplied with charging power by a relay connected to a transistor connected to the second output terminal of the charging switching unit and performing a switching operation;
a current sensor that detects the charging current of the rechargeable batteries A and B and inputs the current to the charging conversion unit;
Charge switching device of a self-powered power generation system provided with a plurality of rechargeable batteries comprising a. The method of claim 1,
a rechargeable battery A connected to a photocoupler connected to the first output terminal of the charging conversion unit and being charged by supplying charging power by an FET that performs a switching operation;
a rechargeable battery B connected to a photocoupler connected to the second output terminal of the charging conversion unit and charged by supplying charging power by an FET that performs a switching operation;
a current sensor that detects the charging current of the rechargeable batteries A and B and inputs the current to the charging conversion unit;
Charge switching device of a self-powered power generation system provided with a plurality of rechargeable batteries comprising a. The method according to any one of claims 1 to 3,
a burden resistor connected in parallel to the current sensor;
A charge switching device of a self-powered power generation system provided with a plurality of batteries including a. a) inputting and storing the charging current of the rechargeable battery A measured by applying the charging power to the rechargeable battery A to the charging conversion unit;
b) applying charging power to rechargeable battery B and inputting and storing the measured charging current of rechargeable battery B into a charging conversion unit;
c) stopping charging when the charging current values of the rechargeable batteries A and B input to the charging conversion unit are overcurrent;
d) comparing the charging current values of the rechargeable batteries A and B if the charging current values of the rechargeable batteries A and B input to the charging conversion unit are not overcurrent;
e) charging the rechargeable battery B when the charging current value of the rechargeable battery A is less than the charging current value of the rechargeable battery B, and charging the rechargeable battery A when the charging current value of the rechargeable battery A exceeds the charging current value of the rechargeable battery B;
f) if the charging currents of the rechargeable batteries A and B exceed 50 mA, continue to charge them, and if they do not exceed 50 mA, determine that they are fully charged and go to step a);
Charge conversion method of a self-powered power generation system provided with a plurality of rechargeable batteries comprising a.

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