| 摘要 |
PROBLEM TO BE SOLVED: To stably detect a DC component.SOLUTION: An inverter 6 converts DC power of a solar cell 2 to AC power and outputs the AC power by interconnecting with a power system. A current detector 18 detects output current of the inverter 6 and generates an output current detection signal. An A/D converter 20 converts the output current detection signal to a digital output current detection signal and supplies the digital output current detection signal to a control unit 16. The control unit 16 functions as a low-pass filter for extracting low frequency components of the digital output current detection signal and integrating the components, and outputs a stop signal for the inverter 6 when the integrated value is equal to or larger than a predetermined reference value. |
