US 7,023,714 B2 · Voltage converter for a power supply

Abstract

A SEPIC type voltage converter (101) comprises a transformer (40) having a primary winding (41) and a storage capacitor (33) connected in series, and a controllable switch (51) coupled in parallel with said series combination. The transformer has a first secondary winding (421) and a first rectifying diode (431) connected in series, and a first capacitor (441) coupled in parallel with said series combination, one terminal of said first capacitor (441) being coupled to an output terminal (451). The voltage converter also comprises feedback means (50; 53, 52) coupled to said output terminal (451) and controlling said controllable switch (51). The transformer further has a second secondary winding (62) and a second rectifying diode (63) connected in series, wherein this series combination is also coupled to said output terminal (451) in order to limit the voltage across the storage capacitor.

Claims11

Dependent claims

A voltage converter (1;

201) comprising:
an energy storage section (111) comprising a first series combination of a storage capacitor (33) and a first inductor (41;
141);
a controllable switch (51) coupled in parallel with said first series combination;
an energy transfer section (112) comprising a second series combination of a first rectifying diode (431;
143) and a first smoothing capacitor (441;
144), the first rectifying diode being coupled to the first inductor;
a first output terminal (451) coupled to a node between said first rectifying diode (431;
143) and a first smoothing capacitor (441;
144);
feedback means (50;
53, 52) coupled to said output terminal (451) for controlling said controllable switch (51);
and
voltage clamping means (60;
160) for clamping a voltage across the storage capacitor (33).

12 more elements

Dependencies are inferred from the claim text.

Voltage converter for a power supply

Life of this patent

Voltage converter for a power supply

Life of this patent

Abstract

Claims11