KR20210109255A - Reverse connection detection circuit and reverse connection detecting method - Google Patents

Abstract

A reverse connection line detection circuit according to an embodiment of the present invention includes: a photo coupler part including a light emitting element and a light receiving element, and connected to a (-) connection end of a power reception side; and a control part that senses the voltage of the output terminal of the light receiving element and detects the presence of a reverse connection line between a power transmission side and the power reception side.

Description

Reverse connection detection circuit and reverse connection detecting method

The present invention relates to a reverse connection detection circuit and a reverse connection detection method, and more particularly, to a reverse connection detection circuit and a reverse connection detection method for preventing internal element burnout by detecting the reverse connection between a power transmission side and a power reception side.

Recently, as problems such as global warming caused by the emission of carbon dioxide and the like accompanying the use of fossil fuels, accidents of nuclear power plants, and radioactive contamination by radioactive wastes become serious, interest in eco-friendly energy is increasing.

In particular, the solar power generation system has advantages in that there are few maintenance elements, low maintenance costs, and high energy production efficiency per generator area compared to other new energy sources. In addition, the power generation system using solar power is a situation in which the installation cost becomes cheaper according to the technological development and the supply is expanding.

On the other hand, in the case of photovoltaic power generation, there is a vacancy in power production that does not generate sufficient power due to changes in weather or night time when sunlight does not exist. Ensure stable power supply.

However, when installing a battery in a photovoltaic system, it is often the case that an operator confuses the DC polarity. In this case, product damage such as internal component burnout of the battery may occur, as well as jeopardize the safety of workers. Therefore, there is a need for a configuration for protecting a product even if reverse wiring occurs due to confuse DC polarity when installing a battery.

The technical problem to be solved by the present invention is to provide a reverse connection detection circuit and a reverse connection detection method for detecting the reverse connection between the power transmission side and the reception side to prevent internal element burnout, etc.

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

In order to solve the above technical problem, the reverse connection detection circuit according to an embodiment of the present invention includes a light emitting element and a light receiving element, the photo coupler unit connected to the (-) connection end of the power receiving side; and a controller configured to detect a reverse connection between the power transmission side and the power reception side by sensing the voltage of the output terminal of the light receiving element.

In addition, the light emitting device may be disposed in a direction in which a current flows when the power transmission side and the power reception side are reversely connected.

In addition, the light emitting device may be a diode, the (+) connection end of the power receiving side may be connected to the cathode of the light emitting device, and the (−) connection end of the receiving side may be connected to the anode of the light emitting device.

In addition, a voltage source may be connected to one end of the light receiving element, and the control unit may be connected to the other end.

In addition, when the control unit senses a voltage, it may include a blocking unit for blocking the supply of power from the power transmission side to the power reception side.

Also, the control unit may generate a reverse connection signal when the voltage sensed by the control unit is converted to an ADC and a reverse connection condition is satisfied.

In addition, the power receiving side may include a DC-DC converter to which the energy storage device is connected.

In order to solve the above technical problem, the reverse wiring detection method according to an embodiment of the present invention includes the steps of wiring a power transmission side and a power reception side; detecting, by a control unit connected to the photocoupler unit, a voltage according to the connection between the power transmission side and the power reception side; and determining, by the control unit, that the power transmission side and the power reception side are reverse-connected when the voltage is sensed.

Also, the method may include generating a reverse connection signal when the voltage sensed by the controller is converted to an ADC and a reverse connection condition is satisfied.

Also, when the control unit determines that the power transmission side and the power reception side are reversely connected, the method may include blocking power supply from the power transmission side to the power reception side.

According to the embodiments of the present invention, when the power transmission side and the power reception side are reversely connected, the power supply from the transmission side to the reception side can be automatically cut off, so that it is possible to prevent damage to internal elements of the product, etc., and improve product stability.

In addition, when the power transmission side and the reception side are reversely connected, the operator can recognize it through the reverse connection signal, so it is possible to take action to immediately connect the normal connection.

In addition, since the reverse connection between the power transmission side and the power reception side is detected through the photocoupler unit, it is possible to insulate the current between the reverse connection detection circuit and other components and circuits constituting the power reception side device.

In addition, in the reverse connection detection circuit of the power transmission side and the reception side through the photocoupler, an insulating material exists between the light emitting element and the light receiving element, and it can be stable from noise because an electric signal is transmitted as light, and the circuit design is simple and reliable this can be higher

The effect according to the present invention is not limited by the contents exemplified above, and more various effects are included in the present specification.

1 is a view for explaining a normal connection and an abnormal connection in a photovoltaic system.
2 is a block diagram of a reverse connection detection circuit according to an embodiment of the present invention.
3 shows an implementation example of a reverse connection detection circuit according to an embodiment of the present invention.
4 is a diagram for explaining an operation of a reverse connection detection circuit according to an embodiment of the present invention.
5 is a flowchart of a reverse connection detection method according to an embodiment of the present invention.
6 and 7 are flowcharts of a reverse connection detection method according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

However, the technical spirit of the present invention is not limited to some embodiments described, but may be implemented in various different forms, and within the scope of the technical spirit of the present invention, one or more of the components may be selected among the embodiments. It can be used by combining or substituted with .

In addition, the terms (including technical and scientific terms) used in this embodiment have a meaning that can be generally understood by those of ordinary skill in the art to which this embodiment belongs, unless specifically defined and described explicitly. may be interpreted, and the meanings of commonly used terms such as terms defined in advance may be interpreted in consideration of the contextual meaning of the related art.

In addition, the terminology used in the present embodiment is for describing the embodiments and is not intended to limit the present invention.

In the present specification, the singular form may also include the plural form unless otherwise specified in the phrase, and when it is described as "at least one (or one or more) of A and (and) B, C", it is combined with A, B, C It may include one or more of all possible combinations.

Also, in describing the components of the present embodiment, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the component from other components, and are not limited to the essence, order, or order of the component by the term.

And, when it is described that a component is 'connected', 'coupled', or 'connected' to another component, the component is directly 'connected', 'coupled', or 'connected' to the other component. In addition to the case, it may include a case of 'connected', 'coupled', or 'connected' by another element between the element and the other element.

In addition, when it is described as being formed or disposed on "above (above)" or "below (below)" of each component, "above (above)" or "below (below)" means that two components are directly connected to each other. It includes not only the case of contact, but also the case where one or more other components are formed or disposed between two components. In addition, when expressed as "upper (upper)" or "lower (lower)", the meaning of not only an upper direction but also a lower direction based on one component may be included.

1 is a view for explaining a normal connection and an abnormal connection in a photovoltaic system.

Figure 1 (a) shows a state in which the photovoltaic panel 10 and the DC-DC converter 31 are normally connected in the photovoltaic power generation system.

The photovoltaic power generation system may include a photovoltaic panel 10 , an inverter 20 , and a DC-DC converter 31 . A battery may be connected to the DC-DC converter 31 . The solar panel 10 may generate power using sunlight, and the generated power may be transmitted to a load through the inverter 20 or may charge the battery through the DC-DC converter 31 . The DC-DC converter 31 and the battery may constitute the battery module 30 .

1 (a) is a state in which the solar panel 10 is connected to the DC-DC converter 31 of the battery module 30 with the same polarity connected to the inverter 20 . On the other hand, (b) of FIG. 1 shows that the photovoltaic panel 10 of the photovoltaic system and the DC-DC converter 31 are abnormally connected, the polarity of the photovoltaic panel 10 connected to the inverter 20 and Conversely, the DC-DC converter 31 of the battery module 30 is in a reverse-connected state.

In the case of reverse wiring as shown in FIG. 1B , an overcurrent or reverse current flows through the battery module 30 , which may cause damage to internal elements of the battery, and may threaten the safety of the operator due to a short circuit.

However, even if the worker confuses the DC polarity and the solar power generation system and the battery are reversely connected, there is a problem in that it cannot be recognized until an accident such as product damage or non-operation occurs.

2 is a block diagram of a reverse connection detection circuit according to an embodiment of the present invention, and FIG. 3 shows an implementation example of the reverse connection detection circuit according to an embodiment of the present invention.

The reverse connection detection circuit 100 according to an embodiment of the present invention includes a photocoupler unit 110 and a control unit 120 , and may further include a blocking unit 130 .

The photocoupler unit 110 includes a light emitting element 111 and a light receiving element 112 .

More specifically, the photocoupler unit 110 is an optical coupling device in which a light emitting device 111 and a light receiving device 112 are combined to transmit a signal using light as a medium, and when a signal is input to the light emitting device 111, light is emitted and When the light is incident on the light receiving element 112 that receives the light, the light receiving element 112 is in a conductive state.

The light emitting device 111 is a device that converts electrical energy into light energy, and may include a gallium arsenide (GaAs) light emitting diode, a gallium phosphide (GaP) light emitting diode, a tungsten lamp, a neon lamp, and the like, and the light receiving device 112 . ) is a device that converts light energy into electrical energy, and a silicon photodiode, a PIN diode, a photo transistor, etc. may be used, but is not particularly limited thereto.

The photocoupler unit 110 is connected to the negative (-) connection end 1002 of the power receiving side, and the light emitting device 111 may be disposed in a direction in which current flows when the power transmitting side and the receiving side are reversely connected.

Specifically, the operator confuses the DC polarity, so that the (+) connection end 101 of the power transmission side is connected to the (-) connection end 1002 of the power reception side, and the (-) connection end 102 of the power transmission side is connected to the power reception If it is connected to the (+) connection terminal 1001 of the side, it is a reverse connection, and at this time, the current of the power supply 10 flows to the (-) connection terminal 1002 of the power receiving side.

That is, since the light emitting element 111 is arranged in the direction in which the current flows when the power transmission side and the power reception side are reversely connected, when the transmission side and the reception side are reversely connected, the power reception as shown in the current flow 11 in FIG. A current flows in the light emitting device 111 connected to the negative (-) connection terminal 1002 on the side, and the light emitting device 111 emits light.

Also, the light emitting device 111 may be a diode. A diode consists of an anode through which current flows and a cathode through which current flows. When the power transmitting side and the receiving side are reversely connected, the anode of the light emitting device 111 through which current flows is connected to the negative (-) connection terminal 1002 on the receiving side, and the cathode of the light emitting device 111 through which current flows is the receiving side. It may be connected to the (+) connection terminal 1001 of the side. Alternatively, the cathode of the light emitting device 111 through which current flows may be in a ground state.

One end of the light receiving element 112 may be connected to the voltage source 113 , and the control unit 120 may be connected to the other end of the light receiving element 112 . Specifically, when the light-receiving element 112 receives the light emitted from the light-emitting element 111 and enters a conductive state, the voltage source 113 connected to the input terminal of the light-receiving element 112 is a control unit connected to the output terminal of the light-receiving element 112 . A reference numeral 120 may sense a voltage obtained by dividing the voltage by the resistors R1 and R2.

Accordingly, when detecting a voltage at the output terminal of the light receiving element 112 , the control unit 120 may determine that the power transmission side and the power reception side are inversely connected.

When it is determined that the power transmission side and the power reception side are reversely connected by sensing the voltage, the control unit 120 may control the blocking unit 130 to cut off the power supply from the transmission side to the reception side. The blocking unit 130 may be disposed between the power reception side and the reverse connection detection circuit 100 , or may be disposed between the reverse connection detection circuit 100 and the battery module 30 .

In this case, the breaker 130 may be a switch or may be implemented as a Remote Control Circuit Breaker (RCCB). When the blocking unit 130 is an RCCB, the control unit 120 may remotely send a signal to the RCCB to cut off the power supply. The type of the blocking unit 130 is not particularly limited, but it is preferable that the (+) connection end 1001 and the (-) connection end 1002 on the power receiving side can be simultaneously disconnected.

The control unit 120 may generate a reverse connection signal when a predefined reverse connection condition is satisfied by converting the voltage detected by the control unit 120 to an analog-digital converter (ADC).

For example, since the voltage sensed by the controller 120 is an analog signal, the controller 120 may convert it into a digital signal to determine whether a predefined reverse connection condition is satisfied.

The meaning of the predefined reverse connection condition may mean whether the voltage is detected by the controller 120 itself, or may mean a critical range of the voltage sensed by the controller 120 .

The reverse connection signal may be a specific signal that allows the operator to recognize whether the reverse connection has been made, or may be a specific signal that displays whether the reverse connection has been made on a display unit outside the product. Alternatively, as a signal including information on which reverse wiring has occurred, it may be transmitted to the user terminal or to the outside.

4 is a diagram for explaining an operation of a reverse connection detection circuit according to an embodiment of the present invention.

The power source 10 may operate as a current source, and the current of the power source 10 flows from the transmitting side to the receiving side. For example, when the optimizer control method is applied to the output of the solar panel 10, the solar panel 10 operates as a current source in the associated system, so that the solar panel 10 uses the battery module ( 30), the current flows.

When the power transmission side and the power reception side are normally connected, that is, the (+) connection terminal 101 of the transmission side of the power supply 10 is connected to the (+) connection terminal 1001 of the reception side, and the power transmission of the power 10 When the (-) connection terminal 102 on the side is connected to the (-) connection terminal 1002 on the receiving side, the current of the power supply 10 flows from the (+) connection terminal 101 on the transmission side to the (+) connection terminal on the receiving side. ) flows to the connecting end (1001).

At this time, since the light emitting device 111 is disposed in a direction in which current flows only when the power transmission side and the power reception side are reversely connected, no current flows in the light emitting device 111 in the normal connection state as described above. That is, the reverse connection detection circuit 100 does not operate, and the current source of the power supply 10 flows through the capacitor 12 to the DC-DC converter 31 of the battery module 30 and operates normally.

However, when the power transmission side and the reception side are reversely connected, that is, the (+) connection terminal 101 of the transmission side of the power supply 10 is connected to the (-) connection terminal 1002 of the reception side, and the power supply 10 When the (-) connection terminal 102 of the power transmission side is connected to the (+) connection terminal 1001 of the reception side of (-) flows to the connecting end (1002).

At this time, since the light emitting device 111 is arranged in a direction in which current flows only when the power transmission side and the power reception side are reversely connected, current flows through the light emitting device 111 in the reverse connection state as described above. More specifically, the anode of the light emitting device 111 is connected to the (-) connection end 1002 of the power receiving side, and the cathode of the light emitting device 111 is connected to the (+) connection end 1001 of the power receiving side Since the cathode) is connected, a current flows as shown in the current flow 11 shown in FIG. 4 .

When a current flows through the light emitting device 111 to emit light, the light receiving device 112 receives the light and becomes a conductive state. The voltage source 113 connected to one end of the light receiving element 112 is sensed by the controller 120 connected to the other end of the light receiving element 112 . Referring to FIG. 4 , the voltage source 113 connected to the input terminal of the light receiving element 112 is divided by the resistors R1 and R2 connected to the output terminal of the light receiving element 112 , and the control unit 120 divides the voltage. voltage can be detected.

When detecting the voltage, the control unit 120 may determine that the power transmission side and the power reception side are reverse connected. In addition, when it is determined that the power transmission side and the power reception side are reversely connected, the control unit 120 may control the blocking unit 130 to cut off the power supply from the transmission side to the reception side. That is, it is possible to prevent the current source of the power supply 10 from being supplied to the battery module 30 .

In addition, the controller 120 may convert the sensed voltage to an analog-digital converter (ADC) to determine whether the reverse connection condition is satisfied, and generate a reverse connection signal when the reverse connection condition is satisfied. Through this, the operator can recognize whether there is a reverse connection between the power transmission side and the reception side, and can take action accordingly.

The reverse wiring detection circuit 100 may be implemented inside the battery module 30 that receives power, or may be implemented as a separate device disposed on the power transmission side and the power reception side, but is not particularly limited thereto.

Since the reverse wiring detection circuit 100 according to an embodiment of the present invention is implemented using a photocoupler, the advantages of the photocoupler can be used. Since the photocoupler transmits a signal using light, it is strong against noise, can insulate the current between each element constituting the photocoupler, and has the advantage of being able to ground each element. In addition, since the coupling capacitance of each element is relatively small, there is an advantage that the signal on the output side does not return to the input side. There is this.

5 is a flowchart of a reverse connection detection method according to an embodiment of the present invention, and FIGS. 6 and 7 are flowcharts of a reverse connection detection method according to another embodiment of the present invention. The detailed description of each step of FIGS. 5 to 7 corresponds to the detailed description of the reverse connection detection circuit of FIGS. 1 to 4 , and thus the redundant description will be omitted.

In order to detect the reverse connection between the power transmission side and the power reception side, if the transmission side and the reception side are connected in step S11, the control unit connected to the photocoupler unit in step S12 detects a voltage according to the connection between the transmission side and the reception side. If the voltage is not detected in step S12, the reverse connection detection operation is terminated. If the voltage is detected in step S12, the control unit determines that the power transmission side and the power receiving side are reverse connected in step S13.

After the controller detects the voltage in step S12, as shown in FIG. 6, the controller converts the detected voltage to an analog-digital converter (ADC) in step S14, and the converted value in step S15 satisfies the preset reverse wiring condition. This will generate a reverse connection signal.

Alternatively, after the control unit detects the voltage in step S12, as shown in FIG. 7, in step S13, the control unit determines that the power transmission side and the power reception side are reverse-connected, and in step S16, the control unit supplies the power from the transmission side to the reception side. can be controlled to block.

At this time, after step S12, steps S14 and S15 and steps S13 and S16 are integrated and the operation can be made at the same time, and the operation of step S13 and step S16 is made after step S14 and step S15, or after step S13 and S16 Steps S14 and S15 may be performed.

Those of ordinary skill in the art related to the present embodiment will understand that it can be implemented in a modified form within a range that does not deviate from the essential characteristics of the above description. Therefore, the disclosed methods are to be considered in an illustrative rather than a restrictive sense. The scope of the present invention is indicated in the claims rather than the foregoing description, and all differences within the scope equivalent thereto should be construed as being included in the present invention.

100: reverse wiring detection circuit
110: photo coupler unit
120: control unit
130: blocking unit

Claims (10)

a photo coupler unit including a light emitting element and a light receiving element and connected to a (-) connection end of the power receiving side; and
and a controller configured to sense a voltage of an output terminal of the light receiving element and detect whether a power transmission side and a power reception side are reversely connected. According to claim 1,
The light emitting device is a reverse connection detection circuit disposed in a direction in which current flows when the power transmission side and the power reception side are reversely connected. According to claim 1,
The light emitting device is a diode,
The (+) connection end of the power receiving side is connected to the cathode of the light emitting device,
The (-) connection end of the power receiving side is connected to the anode of the light emitting device reverse wiring detection circuit. According to claim 1,
A reverse wiring detection circuit in which a voltage source is connected to one end of the light receiving element and the control unit is connected to the other end. According to claim 1,
When the control unit senses the voltage,
Reverse wiring detection circuit including a blocking unit for cutting off the power supply from the transmitting side to the receiving side. According to claim 1,
The control unit is
A reverse connection detection circuit that converts the voltage detected by the controller to ADC and generates a reverse connection signal when the reverse connection condition is satisfied. According to claim 1,
The power receiving side,
A reverse wiring detection circuit including a DC-DC converter to which an energy storage device is connected. connecting the transmission side and the reception side;
detecting, by a control unit connected to the photocoupler unit, a voltage according to the connection between the power transmission side and the power reception side; and
and determining, by the controller, that the power transmission side and the power reception side are reversely connected when the voltage is sensed. 9. The method of claim 8,
and generating a reverse connection signal when a reverse connection condition is satisfied by converting the voltage detected by the controller to an ADC. 9. The method of claim 8,
and when the control unit determines that the power transmission side and the power reception side are reverse connected, cutting off power supply from the power transmission side to the power reception side.

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