×

Switching power supply unit

  • US 8,339,808 B2
  • Filed: 06/14/2010
  • Issued: 12/25/2012
  • Est. Priority Date: 06/19/2009
  • Status: Expired due to Fees
First Claim
Patent Images

1. A switching power supply unit converting a DC input voltage inputted from an input terminal pair into a DC output voltage, and outputting the generated DC output voltage from an output terminal pair, the switching power supply unit comprising:

  • a transformer including;

    a primary winding arranged on the input terminal pair side and a first and a second secondary windings arranged on the output terminal pair side, the first and a second secondary windings being connected in series to each other;

    a magnetic core including two base-plates facing each other and four legs provided between the two base-plates to couple the two base-plates together, the four legs including a first pair of legs on a first diagonal line and a second pair of legs on a second diagonal line, the first and second diagonal lines intersecting each other in a plane along facing surfaces of the two base-plates;

    a first conductive member having through-holes allowing the four respective legs to pass therethrough, and configuring the primary winding which is wound around the legs; and

    a second conductive member having through-holes allowing the four respective legs to pass therethrough, and configuring the first and second secondary windings which are wound around the legs;

    an inverter circuit arranged between the input terminal pair and the primary winding, and including switching elements; and

    a rectifying-smoothing circuit arranged between the output terminal pair and the first and second secondary windings, and including first and second rectifying elements, first to third choke coils, and a capacitive element arranged between the output terminal pair;

    whereinthe first rectifying element is arranged between a first junction and one end of the capacitive element, the first junction being defined as a junction of one end of the first secondary winding and one end of the second choke coil;

    the second rectifying element is arranged between a second junction and the one end of the capacitive element, the second junction being defined as a junction of one end of the second secondary winding and one end of the third choke coil;

    a third junction is connected to the one end of the first choke coil, the third junction being defined as a junction of the other end of the first secondary winding and the other end of second secondary winding; and

    a fourth junction is connected to the other end of the capacitive element, the fourth junction being defined as a junction of the other end of the first choke coil, the other end of the second choke coil and the other end of the third choke coil.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×