| 摘要 |
PURPOSE:To stop an inverter quickly by detecting DC in case that this mixes in DC power by any cause. CONSTITUTION:The DC from a DC power source 1 such as a solar battery, a fuel cell, etc., is converted into AC by controlling PWM by means of an inverter bridge 2, and it connects with an AC system. Moreover, a commercial frequency inverter bridge is made of a bridge 7a using GTO thyristors. And, a current detector 8 detects the current of a diode bridge 5. That is, DC components are detected by comparing the area in every half cycle of this output with the average value of the output current with a current detector 8 for detecting the current of the inverter output. And, on condition that this value has become the set value, the inverter is stopped or cut off the system. |
