×

Switching power supply device

  • US 5,644,479 A
  • Filed: 10/18/1994
  • Issued: 07/01/1997
  • Est. Priority Date: 10/27/1993
  • Status: Expired due to Term
First Claim
Patent Images

1. A switching power supply device comprising:

  • a series circuit constituted by a first switch means which is connected to an input voltage and which is repeatedly turned on and off, and a second switch means which is repeatedly turned on and off to alternate with said first switch means;

    a first capacitor connected to one end of said second switch means;

    a transformer having a primary winding connected to said second switch means and said first capacitor and having at least one secondary winding;

    a series circuit constituted by a second capacitor, and a rectifier diode connected across said at least one secondary winding of said transformer;

    a series circuit constituted by an inductance element and a smoothing capacitor connected across said rectifier diode; and

    a control circuit for controlling turning on and turning off of said first and second switch means in order to control an output voltage, said output voltage being a voltage across said smoothing capacitor.

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