| 摘要 |
A power supply device and a voltage resonance method are provided, which are free from a reduced switching loss, as well as from the situation in which soft switching operations for generating an alternating magnetic field cannot be executed. A first charging device is connected in series with a first switching device, a second switching device is connected in series with the first charging device, and a magnetic field generating device is connected between a power supply line and a node between the first charging device and the second switching device. A second charging device is connected in parallel with the second switching device, a first rectifying device is connected in parallel with the first switching device, and a second rectifying device connected in parallel with the second switching device. A switching control circuit controls driving of the first and second switching devices, such that it alternately turns on the first switching device and the second switching device, more specifically, turns off the first switching device before turning on the second switching device.
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