| 摘要 |
PROBLEM TO BE SOLVED: To supply a compact and inexpensive resonance type power supply device, with high power conversion efficiency.SOLUTION: The resonance type power supply device has high power conversion efficiency. The resonance type power supply device detects time t1 at which a current flowing through a resonance element becomes zero and t2 at which the current flowing through the resonance element becomes a peak value, and sets an ON period of a synchronous rectification element at 2×(t2 - t1) to reduce loss of the synchronous rectification element.SELECTED DRAWING: Figure 1 |
