Photovoltaic module

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, 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 supplies a second current, a level of which is lower than a level of a first current that was supplied 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 supply 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 supplies the second current.

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, 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 supplies second current, a level of which is lower than a level of first current that was supplied 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 supply 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 supplies the second current.