| 摘要 |
PROBLEM TO BE SOLVED: To provide a control device for a resonance DC-DC converter that can operate stably regardless of the size of a load. SOLUTION: The converter has bridge-connected switches S<SB>1</SB>-S<SB>4</SB>wherein; one end of the primary winding of a transformer 6 is connected to the interconnection point of S<SB>1</SB>and S<SB>2</SB>; the other end of the primary winding is connected to the interconnection point of S<SB>3</SB>and S<SB>4</SB>; diodes D1, D2 are reverse-connected in parallel to S<SB>1</SB>and S<SB>2</SB>respectively while at the same time capacitors SC1, SC2 are severally connected in parallel; diodes D3, D4 are reverse-connected in parallel to S<SB>3</SB>and S<SB>4</SB>respectively; a reactor 2 and a capacitor 5 are connected in series to the primary winding of the transformer; a reactor 3 is connected between the other end of the primary winding of the transformer and S<SB>3</SB>; and a reactor 4 is connected between the other end of the primary winding of the transformer and S<SB>4</SB>. With this as the object, a means is provided for forcibly on/off-controlling switchings S<SB>1</SB>-S<SB>4</SB>when the difference between a designated voltage V* for the load and a detected voltage V<SB>o</SB>of the load is equal to or below a prescribed value and the phase difference of phase differences control has reached the lower limit of the permitted range. COPYRIGHT: (C)2003,JPO
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