IP Library › Granted Patent US 7,352,158
Granted Patent B2
US 7,352,158 · App. 11/123,745 · Granted Apr 1, 2008

SEPIC synchronous rectification

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Quick Facts
Patent No.
US 7,352,158
App. No.
11/123,745
Granted
Apr 1, 2008
Kind
B2
Abstract

A SEPIC converter having synchronous rectification, accommodating changes in the converter duty cycle, and the ringing conditions when the converter changes operation from a continuous mode to a discontinuous mode, and back. Conductive losses are significantly reduced.

Claims (7)

1. A power converter comprising:

a SEPIC power converter circuit having an input adapted to receive an input signal and providing an output signal at an output, the circuit having a duty cycle, and further comprising a synchronous rectifier responsive to changes in the duty cycle, wherein the synchronous rectifier comprises a dual slope integrator.

2. The power converter of claim 1 , wherein the synchronous rectifier reduces ringing in the output signal when the converter changes from a continuous mode to a discontinuous mode, and back.

3. The power converter of claim 2 , wherein a frequency of the ringing decreases as a load applied to the output decreases.

4. The power converter of claim 1 , wherein the synchronous rectifier provides a reduction in conductive losses in the converter circuit.

5. The power converter of claim 1 , wherein the integrator includes an inductor capturing energy.

6. The power converter of claim 5 , wherein the integrator is controlled by a gate, and captures an on-time of the gate.