| 摘要 |
PROBLEM TO BE SOLVED: To provide a transformerless type system linkage inverter apparatus which enables soft switching operations of all switching devices with a relatively simple structure. SOLUTION: After a DC power supplied by a solar battery 1 is stepped up by a step-up circuit 4, the stepped-up power is converted into an AC power by an inverter circuit and supplied to a linked commercial AC power system 3. A zero-voltage switching circuit 6 is inserted between the step-up circuit 4 and the inverter circuit 5. When the step-up circuit 4 and the inverter circuit 6 practice switching operations, a control unit 9 forms resonance circuit with the zero-voltage switching circuit so as to have all switching devices. The devices practice switching operations in a system linkage inverter apparatus, practice switching operations at a zero voltage, and reduce a voltage to zero between DC bus-bars with which the step-up circuit 4 and the inverter circuit 5 are connected to each other. |
