| 摘要 |
PROBLEM TO BE SOLVED: To enable a switching frequency coincident with a resonant frequency in a resonance type switching power supply.SOLUTION: A switching power supply 1 includes: a transformer 2 including a primary winding 6 and a plurality of secondary windings 71-7n to which a plurality of loads 81-8n are connected respectively; a plurality of capacitors C1-Cn respectively connected to the plurality of secondary windings 71-7n; a plurality of detection circuits 91-9n which respectively detects connection states to the plurality of secondary windings 71-7n of the plurality of loads 81-8n; switch elements 3a, 3b connected to the primary winding 6; and a control circuit 4 which controls the switching frequency of the switch elements 3a, 3b according to the connection states of the plurality of loads 81-8n detected by the plurality of detection circuits 91-9n.SELECTED DRAWING: Figure 1 |
