KR20220005295A - DC-DC converter for charge current and load sharing control - Google Patents

Abstract

A DC-DC converter for charging current and load sharing control is provided. According to an embodiment of the present invention, the DC-DC converter, in which a renewable energy generation current is input to an input terminal and a load and a rechargeable battery are formed in parallel to an output terminal, comprises: a first ammeter that measures an output current therein; a second ammeter that measures an external current; a control unit that receives and calculates measured current values of the first ammeter and the second ammeter to output a control output. A current line on one side of the rechargeable battery is connected to the second ammeter so that the control unit detects both the output current and a battery charging/discharging current to control the output current according to the amount of the battery charging/discharging current.

Description

DC-DC converter for charge current and load sharing control

The present invention relates to a DC-DC converter for controlling charging current and load sharing, and more particularly, to a method for efficiently managing power in each converter when a plurality of converters simultaneously supply power to a battery and a load. It relates to DC-DC converters.

Demand for renewable energy such as solar power and wind power is increasing in order to deplete resources and protect the environment. Since it is difficult to continuously generate such renewable energy because it is greatly affected by environmental factors such as climate, an ESS (Energy Storage System) such as a battery is used in combination for this purpose. Such a battery charges the generated power and continuously supplies power in the discontinuous power generation section.

As such, as a converter for the use of renewable energy, a buck-boost converter capable of generating a constant voltage and current for both a low voltage and a high voltage is widely used. However, since battery charging or power supply is not smooth with one converter, it is common to drive a plurality of converters in parallel to charge a battery or supply power to a load, and in this case, parallel control for sharing the supply of the load Skills are essential.

In addition, in order to protect the battery, it is essential to control the converter by detecting the charging and discharging currents of the battery because the current charged and discharged from the battery must be within a limited value.

As such technology, in 'DC-DC converter for solar energy storage system and its control method (Public No. 10-2019-0137246)', battery consumption is minimized by maintaining only a minimized function in the solar energy storage system. Disclosed are a DC-DC converter that blocks overdischarge of a battery by appropriately switching between a sleep mode and a cutoff mode that prevents overdischarge of a battery by physically blocking a circuit connected to a battery, and a method for controlling the same.

However, in this way, it is not possible to separately check the actual charge/discharge current supplied to the battery and the load current supplied to the load, but only the output current of the converter can be checked. There was a problem that I couldn't control it.

In particular, when the charge/discharge current of the battery is excessively input or overcharged, the lifespan of the battery may be rapidly reduced, and battery damage may occur. In addition, when a plurality of DC-DC converters are connected in parallel, it is difficult to control the load current in each converter, so there is a limit to evenly sharing the load. Therefore, new technology development is urgently required.

KR 10-2019-0137246 A

DC capable of simultaneously controlling the charging and discharging current of the battery in each converter by calculating the battery charge/discharging current and the load current respectively from the DC-DC converters connected in parallel, and at the same time controlling the load current to evenly distribute the load of each converter It aims to provide a -DC converter.

In order to achieve the above object, a DC-DC converter for charging current and load sharing control according to an embodiment of the present invention is a DC-DC converter in which a renewable energy generation current is input to an input terminal, and a load and a battery are formed in parallel to an output terminal. A DC converter comprising: a first ammeter for measuring an output current therein; a second ammeter for measuring an external current; a control unit for receiving the measured current values of the first ammeter and the second ammeter, calculating and outputting a control output; It consists of including, by connecting the current line of one side of the battery to the second ammeter, the control unit senses the output current and the battery charge/discharge current at the same time to control the output current according to the amount of the battery charge/discharge current do it with

In the case of using the DC-DC converter for controlling the charging current and load sharing by connecting n DC-DC converter output terminals to the battery and the load in parallel, the second ammeters of each DC-DC converter have a current line on one side of the battery. are connected in series to control the output current by sensing each output current and battery charge/discharge current in each DC-DC converter.

The DC-DC converter for controlling the charging current and the load sharing includes a third ammeter for measuring an external current; It further comprises to connect the ground-side current line of the battery to the second ammeter and the third ammeter in series, and connect the load-end grounding line to the line between the second ammeter and the third ammeter, and the output current in the first ammeter , the second ammeter detects battery charge/discharge current, and the third ammeter detects battery charge/discharge current and load current, and the control unit calculates the output current, battery charge/discharge current, and load current to control the output current make it as

In the case of using the DC-DC converter for controlling the charging current and load sharing by connecting n DC-DC converter output terminals to the battery and the load in parallel, the battery ground-side current is supplied to the second ammeters of each DC-DC converter. a battery current sensing line connecting the lines in series; A line extending in series from the end of the battery current sensing line, a load current sensing line connecting the third ammeters of the respective DC-DC converters in series; and connected to a load terminal between the battery current sensing line and the load current sensing line. By connecting the ground line, the output current in the first ammeter of each DC-DC converter, the battery charge/discharge current in the second ammeter, and the battery charge/discharge current and load current in the third ammeter are sensed and delivered to the control unit, The control unit controls the output current by calculating the output current, the battery charge/discharge current, and the load current.

In order to achieve the above object, in a DC-DC converter for charging current and load sharing control according to another embodiment of the present invention, a new renewable energy generation current is input to an input terminal, and a load and a battery are formed in parallel to an output terminal. - A DC converter comprising: a first ammeter for measuring an output current therein; a second ammeter for measuring an external current; a control unit that receives the measured current values of the first ammeter and the second ammeter, calculates, and outputs a control output; A technical gist of the present invention is to connect the load-side current line to the second ammeter to detect the output current and the load current in the control unit to calculate the battery charge/discharge current amount and to control the output current.

In the DC-DC converter for controlling the charging current and load sharing, when n output terminals of the DC-DC converter are connected in parallel to the battery and the load, the load-side current line is connected to the second ammeters of each DC-DC converter. By connecting them in series, each DC-DC converter detects each output current and load current, and calculates the battery charge/discharge current to control the output current.

The present invention by means of solving the above problems has an effect that each converter can measure the output current, the battery charge/discharge current, and the load current.

Therefore, it is possible to protect the battery through instantaneous control of the battery charge/discharge current and to control the real-time sharing of load power through load current control.

In addition, there is an advantage that stable power supply is possible in connection with the renewable energy power system.

1 is a circuit diagram for detecting a converter output current and a battery charge/discharge current according to an embodiment of the present invention;
2 is a circuit diagram showing a case in which two converters are connected in parallel in the related art.
3 is a circuit diagram for detecting a converter output current and a battery charge/discharge current when two converters are connected in parallel according to an embodiment of the present invention.
4 is a circuit diagram for detecting a converter output current, a battery charge/discharge current, and a load current according to an embodiment of the present invention.
5 is a circuit diagram for detecting a converter output current, a battery charge/discharge current, and a load current when a plurality of converters are connected in parallel according to an embodiment of the present invention.
6 is a circuit diagram for detecting a converter output current, a battery charge/discharge current, and a load current when two converters are connected in parallel according to an embodiment of the present invention.
7 is a circuit diagram for detecting a converter output current, a battery charge/discharge current, and a load current when two converters are connected in parallel according to another embodiment of the present invention.
8 is a control block diagram for a battery current and load sharing in a converter parallel connection circuit according to an embodiment of the present invention.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings 1 to 6 . On the other hand, in the drawings and detailed description, general renewable energy generation stage, ammeter, converter Illustrations and references to configurations and actions that can be easily understood by those skilled in this field from etc. have been simplified or omitted. In particular, in the drawings and detailed descriptions, detailed descriptions and illustrations of specific technical configurations and actions of elements not directly related to the technical features of the present invention are omitted, and only the technical configurations related to the present invention are briefly illustrated or described. did

As shown in FIG. 1, an electric circuit including a DC-DC converter for charging current and load sharing control according to an embodiment of the present invention includes a renewable energy generation stage 100, a converter 200, a battery ( 300) and a load 400 . The current generated in the renewable energy generation stage 100 is controlled while passing through the converter 200 and supplied to the battery 300 and the load 400 .

Here, the converter 200 will be described using a buck-boost converter as an example. The buck-boost converter consists of a buck switch and a protective diode for switching and controlling the output voltage with respect to a high input voltage, and includes a boost switch, a boost inductor, and a diode for maintaining the output voltage with respect to a low input voltage. In addition, an ammeter such as a current sensor is included to detect the output current of the converter. In the embodiment of the present invention, such a buck-boost converter is shown, but the present invention is not limited thereto, and can be applied to various converters.

)와 부하로 공급되는 부하전류(

)를 따로 구분하여 확인할 수 없고, 단지 컨버터의 전류센서(210a, 210b)에서 검출되는 출력전류 (

,

)만을 확인할 수 있으므로, 배터리의 충/방전 전류와 부하전류를 제어할 수 없는 단점이 있다. 특히, 배터리의 경우 과충전이 되거나, 충/방전 전류가 과다하게 입력되는 경우에는 배터리의 수명이 급격하게 감소하고, 배터리 소손이 발생할 수 있는 문제점이 있다.The conventional converter 200 has an advantage that a parallel circuit can be configured simply by sharing an output terminal as shown in FIG. 2 , but the actual charge/discharge current (

) and the load current (

) cannot be checked separately, only the output current (

,

) can be checked, so the charge/discharge current and load current of the battery cannot be controlled. In particular, when the battery is overcharged or when the charge/discharge current is excessively input, the lifespan of the battery is rapidly reduced and battery damage may occur.

)를 별도로 검출할 수 있어야 하므로 도 1과 같이 컨버터(200)는 컨버터(200)의 출력전류(

)를 검출하는 제1 전류계(210), 외부전류를 검출하는 제2 전류계(220) 및 제1 전류계(210)와 제2 전류계(220)의 측정 전류값을 입력받아 연산하고 제어출력을 출력하는 제어부(240)를 포함하여 구성되도록 한다.Therefore, in order to prevent burnout and shortening of lifespan due to overcharging and charging/discharging current of the battery, the charge/discharge current (

) must be separately detectable, so as shown in FIG. 1 , the converter 200 has an output current (

) of the first ammeter 210 to detect, the second ammeter 220 to detect an external current, and the measured current values of the first ammeter 210 and the second ammeter 220 to calculate and output a control output It is configured to include the control unit 240 .

)를 검출할 수 있게 되는 것이다.At this time, when a current line of one side of the battery 300 is connected to the second ammeter 220 , the second ammeter 220 is an external current as the charge/discharge current (

) can be detected.

)와 배터리(300) 충/방전 전류(

)를 동시에 감지하여 배터리(300) 충/방전 전류(

)에 따라 컨버터(200) 출력전류(

)를 제어시킴으로써 배터리의 과충전을 방지할 수 있게 된다.The control unit 240 is the converter 200 output current (

) and the battery (300) charge/discharge current (

) at the same time to detect the battery 300 charge/discharge current (

) according to the converter 200 output current (

) to prevent overcharging of the battery.

)를 검출할 수 있게 되는 것이다.In addition, when the current control of the load 400 is more important than the current control of the battery 300, such as when constant power must be supplied to the load 400 for 24 hours, the second ammeter 220 of the converter 200 ) may be connected to one side current line of the load 400 instead of the one side current line of the battery 300 . When a current line on one side of the load 400 is connected to the second ammeter 220 , the second ammeter 220 uses the load 400 charge/discharge current (

) can be detected.

Therefore, it is selected whether to connect the current line on one side of the battery 300 or the current line on the one side of the load 400 to the second ammeter 220 according to more important matters among the protection of the battery 300 and the load 400 sharing. so you can control it.

)를 측정할 수 있다.On the other hand, when the output terminals of the plurality of converters 200 are connected in parallel to the battery 300 and the load 400 and used, one side current line of the battery 300 is connected in series to the second ammeters 220 of each converter 200 . By connecting the charge/discharge current (

) can be measured.

)를 검출하기 위하여 도 3과 같이 회로가 구성될 수 있다. 배터리(300)의 일측 전류선로가 양측 컨버터(200a, 200b)의 각 제2 전류계(220a, 220b)와 직렬 연결되어 각 컨버터(200a, 200b)에서 배터리(300) 충/방전 전류(

)를 검출할 수 있는 것이다.Looking at an embodiment in which the two converters 200 are connected in parallel, the battery 300 charging/discharging current (

), the circuit may be configured as shown in FIG. 3 . A current line on one side of the battery 300 is connected in series with each of the second ammeters 220a and 220b of the converters 200a and 200b on both sides, so that the charge/discharge current of the battery 300 in each converter 200a, 200b (

) can be detected.

)와 배터리(300) 충/방전 전류(

)를 검출하면 배터리(300) 충전전류량에 따라 제어부(240)에서 컨버터(200) 출력전류(

)를 제어시킴으로써 배터리(300)의 충/방전 전류(

)를 제어할 수 있으므로 배터리(300)의 과충전을 방지할 수 있으며, 이를 통하여 배터리(300)의 소손 및 수명 감소를 억제할 수 있다.As described above, in each converter 200, the converter 200 output current (

) and the battery (300) charge/discharge current (

) is detected, the converter 200 output current (

) by controlling the charge/discharge current (

.

)는 검출할 수 없으므로, 정확한 부하 분담이 불가능하며, 이는 컨버터(200) 상태에 따라 수시로 바뀌므로 부하(400) 분담 제어는 이루어지지 않는 문제점이 여전히 존재한다.However, in each converter 200, the current of the other converter 200 or the load 400 current (

) cannot be detected, so accurate load sharing is not possible, and since this changes frequently depending on the state of the converter 200, there is still a problem in that load 400 sharing control is not performed.

)를, 제2 전류계(220)에서는 배터리(300) 충/방전 전류(

)를, 제3 전류계(230)에서는 배터리(300) 충/방전 전류(

)와 부하(400) 전류(

)가 더해진 전체 전류(

)를 검출할 수 있게 된다. 제어부(240)에서는 이렇게 검출된 배터리(300) 충/방전 전류(

)와 부하(400) 전류(

)가 더해진 전체 전류(

)에서 배터리(300) 충/방전 전류(

)를 이용하면 부하(400) 전류(

)를 산출할 수 있다.Accordingly, the converter 200 is configured to further include a third ammeter 230 as shown in FIG. 4 , and connect the ground-side current line of the battery 300 to the second ammeter 220 and the third ammeter 230 in series. and a ground-side current line of the load 400 is connected to a line between the second ammeter 220 and the third ammeter 230 . Through this, in the first ammeter 210, the output current (

), in the second ammeter 220, the battery 300 charge/discharge current (

), in the third ammeter 230, the battery 300 charge/discharge current (

) and load 400 current (

) plus the total current (

) can be detected. In the control unit 240, the detected battery 300 charge/discharge current (

) and load 400 current (

) plus the total current (

) in the battery 300 charge/discharge current (

) using the load 400 current (

) can be calculated.

), 배터리(300) 충/방전 전류(

), 부하(400) 전류(

)를 각각 산출할 수 있는 것이다.That is, in the converter 200 in this way, the converter 200 output current (

), battery 300 charge/discharge current (

), load 400 current (

) can be calculated separately.

)와 배터리(300) 충/방전 전류(

), 부하(400) 전류(

)를 검출하면 배터리(300) 충전전류량과 컨버터(200)의 부하(400) 분담에 따라 제어부(240)에서 컨버터(200) 출력전류(

)를 제어시킴으로써 배터리(300)의 충/방전 전류(

)를 제어할 수 있으므로 배터리(300)의 과충전을 방지하고, 균등한 부하(400) 분담이 가능하다.As described above, in the converter 200, the converter 200 output current (

) and the battery (300) charge/discharge current (

), load 400 current (

) is detected, the output current (

) by controlling the charge/discharge current (

) can be controlled to prevent overcharging of the battery 300 and to evenly distribute the load 400 .

,

,

)를, 제2 전류계(220)에서는 배터리(300)의 충/방전 전류(

)를, 제3 전류계(230)에서는 배터리(300)의 충/방전 전류(

)와 부하(400) 전류(

)가 더해진 전류(

)를 각각 측정할 수 있다.On the other hand, when the output terminals of the plurality of converters 200 are connected in parallel to the battery 300 and the load 400, as shown in FIG. 5 , the second ammeters 220 of each converter 200 are connected to the battery 300 . A load in which the third ammeter 230 of each converter 200 is connected in series to a battery current sensing line 250 to which the ground-side current line of The current sensing line 260 is connected, and the ground-side current line of the load 400 is connected between the battery current sensing line 250 and the load current sensing line 260 to connect the first ammeter 210 of each converter 200. ) in the output current (

,

,

), in the second ammeter 220, the charge/discharge current of the battery 300 (

), in the third ammeter 230, the charge/discharge current of the battery 300 (

) and load 400 current (

) plus the current (

) can be measured individually.

)와 부하(400) 전류(

)가 더해진 전류(

)에서 배터리(300) 충/방전 전류(

)를 이용하여 부하(400) 전류(

)를 산출할 수 있다.In the controller 240 of each converter 200, the battery 300 charge/discharge current (

) and load 400 current (

) plus the current (

) in the battery 300 charge/discharge current (

) using the load 400 current (

) can be calculated.

,

,

), 배터리(300) 충/방전 전류(

), 부하(400) 전류(

)를 각각 산출할 수 있는 것이다.That is, in each converter 200 in this way, the converter 200 output current (

,

,

), battery 300 charge/discharge current (

), load 400 current (

) can be calculated separately.

)와 부하(400) 전류(

)를 검출하기 위하여 도 6과 같이 회로가 구성될 수 있다. 먼저, 배터리(300)의 접지측 전류선로를 양측 컨버터(200a, 200b)의 각 제2 전류계(220a, 220b)와 각 제3 전류계(230a, 230b)에 직렬 연결시킨다. 또한, 배터리(300)의 접지측 전류선로 중 제2 전류계(220a, 220b)는 모두 지나고, 제3 전류계(230a, 230b)로 입력되기 전 지점에 부하(400)의 접지측 전류선로를 연결시킨다.Looking at an embodiment in which the two converters 200 are connected in parallel, the battery 300 charging/discharging current (

) and load 400 current (

), the circuit may be configured as shown in FIG. 6 . First, the ground-side current line of the battery 300 is connected in series to each of the second ammeters 220a and 220b and each of the third ammeters 230a and 230b of the converters 200a and 200b on both sides. In addition, all of the second ammeters 220a and 220b of the ground-side current lines of the battery 300 pass, and the ground-side current line of the load 400 is connected to a point before being input to the third ammeters 230a and 230b. .

That is, the battery current sensing line 250 is connected so that the ground-side current line of the battery 300 is connected in series to each of the second ammeters 220a and 220b of the converters 200a and 200b on both sides, and the second ammeter 220a , 220b), the ground-side current line of the load 400 is connected to the end of the battery current sensing line 250 so that it is serially connected to each of the third ammeters 230a and 230b of the converters 200a and 200b on both sides. The load current sensing line 260 is connected.

)가 검출되고, 제3 전류계(230a, 230b)에서는 배터리(300) 충/방전 전류(

)와 부하(400) 전류(

)가 더해진 전류(

)가 검출되므로 각 컨버터(200a, 200b)의 제어부(240)에서 연산을 통해 부하(400) 전류(

)도 검출할 수 있게 되는 것이다.At this time, in the second ammeter (220a, 220b), the battery 300 charge / discharge current (

) is detected, and in the third ammeters 230a and 230b, the battery 300 charge/discharge current (

) and load 400 current (

) plus the current (

) is detected, so the load 400 current (

) can also be detected.

)가 제3 전류계(230)에서 직접 검출될 수 있도록 하는 결선방법을 제시하고 있다. 배터리(300)의 접지측 전류선로가 양측 컨버터(200a, 200b)의 각 제2 전류계(220a, 220b)에 직렬 연결되도록 하는 배터리전류 감지선로(250)를 결선시키고, 부하(400)측 전류선로가 양측 컨버터(200a, 200b)의 각 제3 전류계(230a, 230b)에 직렬 연결되도록 하는 부하전류 감지선로(260)를 결선시켜 제2 전류계(220a, 220b)에서는 배터리(300) 충/방전 전류만 검출하고, 제3 전류계(230a, 230b)에서는 부하(400) 전류만 검출할 수 있게 되는 것이다.Looking at another embodiment, in Figure 7, the load 400 current (

) to be directly detected by the third ammeter 230 is presented. The battery current sensing line 250 is connected so that the ground-side current line of the battery 300 is connected in series to each of the second ammeters 220a and 220b of the converters 200a and 200b on both sides, and the load 400 side current line is connected in series to each of the third ammeters 230a and 230b of the both sides of the converters 200a and 200b, and the second ammeter 220a, 220b has a battery 300 charging/discharging current. is detected, and only the load 400 current can be detected by the third ammeters 230a and 230b.

)를, 제3 전류계(230)에서는 부하(400) 전류(

)를 각각 검출하므로, 배터리(300) 충/방전 전류의 순시 제어와 실시간 부하(400) 분담제어가 가능하며, 제2 전류계(220)들의 전류센서 부담을 고려할 수 있다는 이점이 있다.Unlike the method shown in FIG. 6 , the connection by the method shown in FIG. 7 is the battery 300 charging/discharging current (

), in the third ammeter 230, the load 400 current (

), instantaneous control of the battery 300 charging/discharging current and real-time load 400 sharing control are possible, and there is an advantage that the current sensor burden of the second ammeters 220 can be considered.

)와 부하(400) 전류(

) 분담을 위한 제어 실시 예로서, 컨버터(200)의 지령 전압을 생성하기 위한 제어부(240)의 실시예를 나타낸다. FIG. 8 shows the actual battery 300 charging/discharging current (

) and load 400 current (

) as a control embodiment for sharing, an embodiment of the control unit 240 for generating a command voltage of the converter 200 is shown.

은 각각 도 5에서 컨버터(200a)의 출력전류, 컨버터(200b)의 출력전류, 배터리(300) 충/방전 전류, 배터리(300) 지령전류를 나타내며, 도 7에서 두 컨버터(200)의 출력전류의 합은 배터리(300) 충/방전 전류와 부하(400) 전류의 합과 같으므로, 각 컨버터(200)에서 다른 컨버터(200)의 전류는 다음과 같이 산출될 수 있다.the input value

is the output current of the converter 200a in FIG. 5, the output current of the converter 200b, the battery 300 charge/discharge current, and the battery 300 command current, respectively, in FIG. 7, the output currents of the two converters 200 Since the sum of is equal to the sum of the battery 300 charge/discharge current and the load 400 current, the current of the other converter 200 in each converter 200 can be calculated as follows.

=

+

-

· Converter 200a:

=

+

-

=

+

-

· Converter 200b:

=

+

-

)를 제어하기 위한 오차Δ

는 다음과 같이 산출될 수 있다.In addition, the battery 300 charge / discharge current (

) to control the errorΔ

can be calculated as follows.

=

-

· Δ

=

-

은 배터리(300)의 충/방전 전류 지령치이고,

는 제2 전류계(220)로부터 구해지는 실제 배터리(300)의 충/방전 전류를 나타내고 있다.At this time,

is the charge/discharge current command value of the battery 300,

represents the charging/discharging current of the actual battery 300 obtained from the second ammeter 220 .

는 컨버터(200a)에서 본 오차이므로, 다음과 같이 산출될 수 있다.Error Δ between the two converters 200a and 200b for load sharing

Since is the error seen in the converter 200a, it can be calculated as follows.

=

-

· Δ

=

-

는 다음과 같이 계산될 수 있다.Accordingly, the control output voltage outputted from the controller 240 of the converters 200a and 200b of FIG. 8 .

can be calculated as follows.

는 제어기의 비례이득(10)이고,

은 제어기의 적분이득(20)이며,

는 제어기의 안티-와인드업 제어이득(30)을 나타낸다. 제어출력전압

는 제어부(240)의 전압 제한에 의해서 제한되어 최종 지령전압

가 벅-부스터 컨버터의 지령전압으로 결정된다. 이때 전압 제한값

과

는 사용자의 부하(400) 상태나 배터리(300)의 최대 충전 및 최대 방전 전압을 고려하여 결정 될 수 있다.only,

is the proportional gain (10) of the controller,

is the integral gain (20) of the controller,

denotes the anti-windup control gain 30 of the controller. Control output voltage

is limited by the voltage limit of the control unit 240, so that the final command voltage

is determined by the reference voltage of the buck-boost converter. At this time, the voltage limit value

class

may be determined in consideration of the user's load 400 state or the maximum charging and maximum discharging voltages of the battery 300 .

In this way, in a parallel system combining the ESS such as the buck-boost converter 200 and the battery 300 for the renewable energy generation stage 100 in this way, instantaneous control of the charging and discharging current of the battery 300 and the load (400) A parallel circuit may be connected so that the load sharing for the current can be simultaneously performed in each converter 200.

Through this, when a plurality of converters 200 simultaneously supply power to the battery 300 and the load 400, there is an advantage that each converter 200 can control the load 400 uniformly, and efficient power management is possible. It has the effect that it is possible. In addition, there is an advantage that the charging/discharging current of the battery 300 can be instantaneously controlled in real time to protect the battery 300 .

As described above, although the DC-DC converter for charging current and load sharing control according to the embodiment of the present invention has been illustrated according to the above description and drawings, this is merely an example and does not depart from the technical spirit of the present invention. It will be well understood by those skilled in the art that various changes and modifications can be made without departing from the scope of the present invention.

100: Renewable energy generation group
200: converter
210: first ammeter
220: second ammeter
230: the third ammeter
240: control unit
250: battery current sensing line
260: load current sensing line
300: battery
400: load

Claims (6)

In the DC-DC converter in which a renewable energy generation current is input to an input terminal and a load and a battery are formed in parallel to an output terminal,
a first ammeter for measuring the output current therein;
a second ammeter for measuring an external current;
a control unit that receives the measured current values of the first ammeter and the second ammeter, calculates, and outputs a control output;
consists of,
By connecting a current line of one side of the battery to the second ammeter,
DC-DC converter for charge current and load sharing control, characterized in that the control unit senses the output current and the battery charge/discharge current at the same time and controls the output current according to the amount of the battery charge/discharge current. According to claim 1,
The DC-DC converter is
When n DC-DC converter output terminals are connected in parallel to the battery and load,
A current line on one side of the battery is connected in series to the second ammeters of each of the DC-DC converters.
DC-DC converter for charging current and load sharing control, characterized in that each DC-DC converter detects each output current and battery charge/discharge current to control the output current. According to claim 1,
The DC-DC converter is
a third ammeter for measuring an external current;
consists of more
Connecting the ground-side current line of the battery to the second ammeter and the third ammeter in series,
The load terminal ground line is connected to the line between the second ammeter and the third ammeter,
In the first ammeter, the output current,
In the second ammeter, the battery charge/discharge current,
The third ammeter detects battery charge/discharge current and load current.
DC-DC converter for charging current and load sharing control, characterized in that the control unit controls the output current by calculating the output current, battery charge/discharge current, and load current. 4. The method of claim 3,
The DC-DC converter is
When n DC-DC converter output terminals are connected in parallel to the battery and load,
a battery current sensing line connecting the battery ground-side current line in series to the second ammeters of each of the DC-DC converters;
A line extending in series to an end of the battery current sensing line, a load current sensing line connecting the third ammeters of each of the DC-DC converters in series;
finalize
A load end ground line is connected between the battery current sensing line and the load current sensing line,
In the first ammeter of each DC-DC converter, the output current,
In the second ammeter, the battery charge/discharge current,
Charging current, characterized in that the third ammeter senses the battery charge/discharge current and load current and transmits it to the control unit, and the control unit controls the output current by calculating the output current, battery charge/discharge current, and load current DC-DC converter for load sharing control. In the DC-DC converter in which a renewable energy generation current is input to an input terminal and a load and a battery are formed in parallel to an output terminal,
a first ammeter for measuring the output current therein;
a second ammeter for measuring an external current;
a control unit that receives the measured current values of the first ammeter and the second ammeter, calculates, and outputs a control output;
consists of,
By connecting the load-side current line to the second ammeter,
A DC-DC converter for charging current and load sharing control, characterized in that the control unit detects the output current and the load current, calculates the amount of battery charge/discharge current, and controls the output current. 6. The method of claim 5,
The DC-DC converter is
When n DC-DC converter output terminals are connected in parallel to the battery and load,
A load-side current line is connected in series to the second ammeters of each DC-DC converter.
A DC-DC converter for charge current and load sharing control, characterized in that each DC-DC converter detects each output current and load current, and controls the output current by calculating the battery charge/discharge current.

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