| 摘要 |
An inverter system which converts DC input into AC output and supplies the AC output to a load such as an FL tube (4) detects change in a circuit current due to anomaly such as discharge without contacting with a current route (14, 16, 52, 54, 70, 72). Relating to an inverter (2) which converts DC input (12) into AC output and supplies the AC output to a load (4), change in a circuit current of the inverter (2) is detected through the medium of magnetic flux change ( DELTA phi ) due to the change in the circuit current caused by discharge. For example, if change in a current occurs in the circuit current of the inverter (2) by disconnection discharge or ground-fault discharge occurring in a current route (14, 16, 52, 54, 70, 72) including a load (4) of the inverter (2), magnetic flux change ( DELTA phi ) occurs in circuit wiring (14, 16, 52, 54, 70, 72) and a space of a core gap (25) of a transformer (22) of the inverter (2). The change in the circuit current is detected through the medium of the magnetic flux change ( DELTA phi ) without contacting with the circuit wiring (14, 16, 52, 54, 70, 72) or the transformer (22). <IMAGE> |
