Back to results
US 6,094,038 AGranted
Buck converter with inductive turn ratio optimization
AssigneeSemtech Corporation
InventorPatrice R. Lethellier
Life of this patent
Estimating the term…
Abstract
A DC--DC power converter circuit for converting relatively high input voltages to relatively low output voltages employs a buck-type circuit topology with a multiple winding inductor. An optional winding is provided to the inductor to clamp a voltage spike appearing on the drain of one of the switching devices. Optionally, two inductor windings may be capacitively coupled for better efficiency.
Claims24
A DC--DC synchronous converter, comprising:
- an input voltage node for connecting to an input voltage;
- an output voltage node for providing an output voltage;
- a fixed voltage node, such as ground;
- a first switching device having a first switching input, a first terminal and a second terminal;
- a second switching device having a second switching input, a first terminal and a second terminal;
- and
- an inductor having a series connected first winding and second winding, said first winding having a first number of turns and said second winding having a second number of turns, said inductor including a center tap connected to said first winding and said second winding, an input connected to said first winding and an output connected to said second winding,
- said first terminal of said first switching device connected to said input voltage node;
- said inductor input coupled to said second terminal of said first switching device;
- said second terminal of said second switching device connected to said fixed voltage node;
- said first terminal of said second switching device connected to said center tap;
- and
- said output of said inductor connected to said output voltage node.
10 more elements
A DC--DC synchronous converter, comprising:
- an input voltage node for connecting to an input voltage;
- an output voltage node for providing an output voltage;
- a fixed voltage node, such as ground;
- a first switching device having a first switching input, a first terminal and a second terminal;
- a second switching device having a second switching input, a first terminal and a second terminal;
- and
- an inductor having a first winding and a second winding, said first winding having a first number of turns and said second winding having a second number of turns, said first winding magnetically coupled to said second winding, each said winding having a first end and a second end,
- said first end of said first winding connected to said input voltage node;
- said second end of said first winding connected to said first terminal of said first switching device;
- said second terminal of said first switching device connected to said first terminal of said second switching device and to said first end of said second winding;
- said second terminal of said second switching device connected to said fixed voltage node;
- and
- said second end of said second winding connected to said output voltage node.
10 more elements
A DC--DC synchronous converter, comprising:
- an input voltage node for connecting to an input voltage;
- an output voltage node for providing an output voltage;
- a fixed voltage node, such as ground;
- a first switching device having a first switching input, a first terminal and a second terminal;
- a second switching device having a second switching input, a first terminal and a second terminal;
- and
- an inductor having a first winding, a second winding and a third winding, said first winding having a first number of turns, said second winding having a second number of turns and said third winding having a third number of turns, said first, second and third windings magnetically coupled to one another, each said winding having a first end and a second end, said first ends being all of the same polarity and said second ends being all of the opposite polarity to said first ends,
- said first end of said first winding connected to said input voltage node;
- said second end of said first winding connected to said first terminal of said first switching device;
- said second terminal of said first switching device connected to said first terminal of said second switching device and to said first end of said second winding;
- said second end of said second winding connected to said output voltage node;
- said second terminal of said second switching device connected to said fixed voltage node;
- said first end of said third winding connected to said fixed voltage node;
- said second end of said third winding connected to the anode of a diode;
- and
- a cathode of said diode connected to said output voltage node.
13 more elements
A DC--DC synchronous converter, comprising:
- an input voltage node for connecting to an input voltage;
- an output voltage node for providing an output voltage;
- a fixed voltage node, such as ground;
- a first switching device having a first switching input, a first terminal and a second terminal;
- a second switching device having a second switching input, a first terminal and a second terminal;
- and
- an inductor having a first winding, a second winding and a third winding, said first winding having a first number of turns, said second winding having a second number of turns and said third winding having a third number of turns, each said winding having a first end and a second end, said first ends being all of the same polarity and said second ends being all of the opposite polarity to said first ends;
- and
- said first end of said first winding connected to said input voltage node;
- said second end of said first winding connected to said first terminal of said first switching device and to a first lead of a first capacitor;
- said second terminal of said first switching device connected to said first terminal of said second switching device and to said first end of said second winding;
- said second end of said second winding connected to said output voltage node;
- said second terminal of said second switching device connected to said fixed voltage node;
- said first end of said third winding connected to said fixed voltage node;
- said second end of said third winding connected to the anode of a diode and to a second lead of said first capacitor;
- and
- a cathode of said diode connected to said output voltage node.
14 more elements
Dependencies are inferred from the claim text.