| 摘要 |
PROBLEM TO BE SOLVED: To materialize the cost reduction of a power circuit adaptable to a wide range and the downsizing of a circuit board. SOLUTION: This switching power circuit is equipped with two sets of compound resonance type converters in each of which a partial resonance voltage circuit is combined with a current resonance type converter equipped with a half bridge circuit, and they are connected in parallel with each other to DC input voltage. Each half bridge has the pair of switching elements Q1 and Q2 and the pair of switching elements Q3 and Q4. This circuit switches switching elements Q1 and Q4, making use of a first drive (for high side) signal outputted from one control IC2. Moreover, this switches switch elements Q2 and Q3, by making use of a second drive (for low side) signal. Besides, it is constituted so that this circuit performs the switching control so that it may be in a parallel operation mode where two converters operate at AC 150V or lower, and that it may be in a single operation mode where one converter operates at AC150V or higher. COPYRIGHT: (C)2004,JPO
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