Ground fault detector and power conditioner

A power conditioner comprising:

• an inverter circuit converting a DC voltage inputted via a positive electrode input terminal and a negative electrode input terminal into an AC voltage;
• a voltage dividing circuit having one end connected to the positive electrode input terminal and another end connected to the negative electrode input terminal;
• and
• a ground fault detector receiving a voltage divided by the voltage dividing circuit as an input voltage signal, and detecting an occurrence of a ground fault based on a magnitude of a voltage of the input voltage signal,
• wherein
• the ground fault detector emits an AC ground fault detection signal when both of a first condition and a second condition are satisfied,
• the first condition is a condition where the input voltage signal includes a first voltage signal having a frequency equal to or higher than a predetermined first frequency and,
• the second condition is a condition where a deviation of the first voltage signal with respect to a predetermined AC ground reference potential is equal to or greater than a predetermined AC ground fault detection voltage.