The inverter system that converts DC input into AC output and provides AC output to the load (such as FL transistor) can detect circuit current changes caused by abnormal discharge without touching the current path. Regarding the inverter that converts DC input into AC output and provides AC output to the load, the change in circuit current of the inverter is detected by the change in magnetic flux caused by the change in circuit current caused by discharge. For example, if a current change occurs in the circuit current of the inverter due to open circuit discharge or ground fault discharge in the current path of the load including the inverter, a magnetic flux change occurs in the space between the circuit wiring and the core gap. Transformer for inverter
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