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Switch-mode DC power supply, monolithic IC and hybrid IC for the same

  • US 6,134,123 A
  • Filed: 12/06/1999
  • Issued: 10/17/2000
  • Est. Priority Date: 12/06/1999
  • Status: Expired due to Term
First Claim
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1. A switch-mode dc power supply comprising:

  • (a) a series circuit comprising a primary winding of a HF transformer, a semiconductor switching element and a current detection unit connected between two output terminals of a rectifier/smoothing circuit;

    (b) a rectifier, connected to a end of a secondary winding of said HF transformer;

    (c) an output smoothing circuit connected between said rectifier and other end of said HF transformer;

    (d) a detection circuit connected to a connection point between said rectifier and said output smoothing circuit;

    (e) an adding circuit connected between said detection circuit and a connection point between said semiconductor switching element and said current detection unit;

    (f) a triangular wave generator connected to said adding circuit; and

    (g) a control signal generator connected between said adding circuit and a control electrode of said semiconductor switching element, and further connected to said triangular wave generator.

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