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Switching power supply unit

  • US 20080198632A1
  • Filed: 02/15/2008
  • Published: 08/21/2008
  • Est. Priority Date: 02/20/2007
  • Status: Active Grant
First Claim
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1. A switching power supply unit, comprising:

  • a transformer including a first transformer coil and a second transformer coil magnetically coupled to each other,a first bidirectional switching circuit disposed between the first transformer coil and a first DC power supply, and configured to include at least one switch array configured of a pair of switches connected in series,a second bidirectional switching circuit disposed between the second transformer coil and AC voltage input/output terminals, and configured such that switch arrays are connected in parallel to each other, each of the switch arrays being configured of a pair of switches connected in series,a third bidirectional switching circuit disposed between the second switching circuit and the AC voltage input/output terminals, and configured to include at least one switch array configured of a pair of switches connected in series, anda control section controlling the first to third switching circuits.

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