Single-phase photovoltaic inverter

A single-phase photovoltaic inverter that converts direct current electric power supplied from a single-phase photovoltaic module into alternating current electric power, the single-phase photovoltaic inverter comprising:

• an input terminal including a first input terminal connecting to a positive polarity of the single-phase photovoltaic module and a second input terminal connecting to a negative polarity of the single-phase photovoltaic module;
• an inverter unit configured to convert direct current electric power supplied through the input terminal into alternating current electric power and supply the converted alternating current electric power to a grid;
• and
• a leakage current measuring unit connected in parallel with the inverter unit and configured to measure a leakage current delivered through the input terminal,
• wherein the leakage current measuring unit comprises:
• a first insulated transformer having one end connected with the first input terminal, and configured to amplify a leakage current flowing to a ground;
• a first current transformer having one end connected with the other end of the first insulated transformer and having the other end connected with the ground, and configured to measure the leakage current amplified by the first insulated transformer;
• a second insulated transformer having one end connected with the second input terminal, and configured to amplify the leakage current flowing to the ground;
• a second current transformer having one end connected with the other end of the second insulated transformer and the other end connected with the ground, and configured to measure the leakage current amplified by the second insulated transformer;
• a first sensing line configured to deliver the leakage current measured by the first current transformer to a controller;
• and
• a second sensing line configured to deliver the leakage current measured by the second current transformer to the controller.