| 摘要 |
PROBLEM TO BE SOLVED: To protect a series resonance inverter against an in-phase overvoltage generated through ground fault, or the like, and to prevent the elements from being broken, while preventing erroneous operation of a controller. SOLUTION: An inverter 1 is connected with resonance capacitors 6A, 6B and a resonance coil comprising the primary winding of a current transformer CT 7 to constitute a series resonance inverter, which is protected against an in-phase overvoltage by providing a grounding circuit 2 comprising a coil 21 grounded at an intermediate point, thereby absorbing an in-phase overvoltage, generated due to grounding of the CT 7 on the primary thereof. |
