PHOTOVOLTAIC MODULE
First Claim
1. A photovoltaic module comprising:
- a solar cell module including a plurality of solar cells, a first conductive line connected to a first solar cell among the plurality of solar cells, and a second conductive line connected to a second solar cell among the plurality of solar cells; and
a junction box attached to a back surface of the solar cell module,wherein the junction box includes a power conversion unit including a capacitor unit located between the first conductive line and the second conductive line,wherein, when shading occurs in some of the plurality of solar cells, the power conversion unit selects a second current, a level of which is lower than a level of a first current that was selected before the shading occurs, without bypass for at least one of the first conductive line and the second conductive line,wherein the power conversion unit further includes;
an input voltage detector to detect an input voltage at opposite ends of the capacitor unit; and
a controller configured to select the first current, andwherein, when a voltage variation rate of the input voltage detected by the input voltage detector is a predetermined value or more, the controller determines that the shading occurs, and selects the second current.
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Accused Products
Abstract
A photovoltaic module includes a solar cell module including multiple solar cells, and first and second conductive lines connected respectively to first and second solar cells among the solar cells, and a junction box attached to the solar cell module. The junction box includes a power conversion unit including a capacitor unit located between the first and second conductive lines, a converter unit to change the level of a DC voltage at opposite ends of the capacitor unit and to output the DC voltage, and a controller to control the converter unit. When shading occurs in some of the solar cells, the power conversion unit supplies a second current, the level of which is lower than the level of a first current supplied before shading occurs, whereby the possibility of generation of a hot spot may be reduced despite the absence of bypass diodes when shading occurs.
0 Citations
18 Claims
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1. A photovoltaic module comprising:
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a solar cell module including a plurality of solar cells, a first conductive line connected to a first solar cell among the plurality of solar cells, and a second conductive line connected to a second solar cell among the plurality of solar cells; and a junction box attached to a back surface of the solar cell module, wherein the junction box includes a power conversion unit including a capacitor unit located between the first conductive line and the second conductive line, wherein, when shading occurs in some of the plurality of solar cells, the power conversion unit selects a second current, a level of which is lower than a level of a first current that was selected before the shading occurs, without bypass for at least one of the first conductive line and the second conductive line, wherein the power conversion unit further includes; an input voltage detector to detect an input voltage at opposite ends of the capacitor unit; and a controller configured to select the first current, and wherein, when a voltage variation rate of the input voltage detected by the input voltage detector is a predetermined value or more, the controller determines that the shading occurs, and selects the second current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A photovoltaic module comprising:
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a solar cell module including a plurality of solar cells, a first conductive line connected to a first solar cell among the plurality of solar cells, and a second conductive line connected to a second solar cell among the plurality of solar cells; and a junction box attached to a back surface of the solar cell module, wherein the junction box includes a power conversion unit, which includes a capacitor unit located between the first conductive line and the second conductive line, a converter unit to change a level of a DC voltage at opposite ends of the capacitor unit and to output the level-changed DC voltage, and a controller to control the converter unit, wherein, when shading occurs in some of the plurality of solar cells, the power conversion unit selects a second current, a level of which is lower than a level of a first current that was selected before the shading occurs, wherein the power conversion unit further includes; an input voltage detector to detect an input voltage at opposite ends of the capacitor unit; and the controller configured to select the first current, and wherein when a voltage variation rate of the input voltage detected by the input voltage detector is a predetermined value or more, the controller determines that the shading occurs, and selects the second current. - View Dependent Claims (16)
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17. A photovoltaic module comprising:
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a solar cell module including a plurality of solar cells, a first conductive line connected to a first solar cell among the plurality of solar cells, and a second conductive line connected to a second solar cell among the plurality of solar cells; and a junction box attached to a back surface of the solar cell module, wherein the junction box includes a power conversion unit, which includes a capacitor unit located between the first conductive line and the second conductive line, a converter unit to change a level of a DC voltage at opposite ends of the capacitor unit and to output the level-changed DC voltage, an inverter unit to convert the level-changed DC voltage into an AC voltage and to output the AC voltage, and a controller to control the converter unit and the inverter unit, wherein, when shading occurs in some of the plurality of solar cells, the power conversion unit selects second current, a level of which is lower than a level of first current that was selected before the shading occurs, wherein the power conversion unit further includes; an input voltage detector to detect an input voltage at opposite ends of the capacitor unit; and the controller configured to select the first current, and wherein, when a voltage variation rate of the input voltage detected by the input voltage detector is a predetermined value or more, the controller determines that the shading occurs, and selects the second current. - View Dependent Claims (18)
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Specification