| 摘要 |
<p>A detection and control circuit for the DC content at the output side of a grid connected inverter comprises a sampling resistor unit (1) and a unit (2) for extracting, detecting and controlling the DC component therein. The sampling resistor unit (1) is connected in series in the circuit at the AC output side of the inverter. The sampling resistor unit (1) is connected to the unit (2) for extracting, detecting and controlling the DC component. The unit (2) for extracting, detecting and controlling the DC component is connected to an inversion circuit of the inverter. The sampling resistor unit (1) is a sampling resistor connected in series in the circuit at the output side of the inverter or an equivalent series resistor. The unit (2) for extracting, detecting and controlling the DC component comprises a DC component extracting and signal processing unit (10), an isolating circuit unit (20) and a control circuit (30) connected in succession. The present invention is simple in structure, accurate in its control, and low cost, and it can control the DC output content so as to meet the standards of various countries.</p> |
