| 摘要 |
A switching power supply unit is capable of performing zero-voltage switching in the entire load region to reduce switching loss and noise and improve the voltage transmission efficiency. The switching power supply unit has a main switching device, and an auxiliary switching device for controlling resonance so as to prevent power loss accompanying a switching action of the main switching device. A control circuit varies the OFF period, during which the main switching device and the auxiliary switching device are OFF simultaneously, according to power consumption by a load on an apparatus in which the switching power supply unit is installed.
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