US 2019/0379293 A1 · SYNCHRONOUS RECTIFIER CONTROL

Abstract

A synchronous rectifier control circuit includes a drain voltage input, a gate voltage output, a gate voltage generation circuit, a burst detection circuit, an on-time monitor circuit, and a burst mode reset circuit. The gate voltage generation circuit includes a first input coupled to the drain voltage input, and an output coupled to the gate voltage output. The burst detection circuit includes a first input coupled to the drain voltage input, and an output coupled to a second input of the gate voltage generation circuit. The on-time monitor circuit includes an input coupled to the output of the gate voltage generation circuit. The burst mode reset circuit includes a first input coupled to the drain voltage input, a second input coupled to an output of the on-time monitor circuit, and an output coupled to a second input of the burst detection circuit.

Claims20

Dependent claims

A synchronous rectifier control circuit, comprising:

a drain voltage input;
a gate voltage output;
a gate voltage generation circuit comprising:
a first input coupled to the drain voltage input;
and
an output coupled to the gate voltage output;
a burst detection circuit comprising:
a first input coupled to the drain voltage input;
and
an output coupled to a second input of the gate voltage generation circuit;
a burst mode reset circuit comprising:
an input coupled to the drain voltage input;
and
an output coupled to a second input of the burst detection circuit.

11 more elements

A switch-mode power supply, comprising:

a transformer;
a synchronous rectifier coupled to a secondary winding of the transformer;
a synchronous rectifier control circuit coupled to the synchronous rectifier, and
comprising:
an input coupled to a drain terminal of the synchronous rectifier;
an output coupled to a gate terminal of the synchronous rectifier;
a gate voltage generation circuit comprising:
a first input coupled to the input of the synchronous rectifier control circuit;
and
an output coupled to the output of the synchronous rectifier control circuit;
a burst detection circuit comprising:
a first input coupled to the input of the synchronous rectifier control circuit;
and
an output coupled to a second input of the gate voltage generation circuit;
and
a burst mode reset circuit comprising:
an input coupled to the input of the synchronous rectifier control circuit;
and
an output coupled to a second input of the burst detection circuit.

16 more elements

Dependencies are inferred from the claim text.

Facts

Application

16/427,094Filed 30 May 2019

Priority

11 Jun 2018

Published

12 Dec 2019

Term ends

Not estimatedThe source records don’t support an estimate.

Classification9 codes

H02M 3/33592
Having at least one active switching element at the secondary side of an isolation transformer: having a synchronous rectifier circuit or a…
H02M 1/08
Details of apparatus for conversion: circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in…
H02M 1/0035
Control circuits allowing low power mode operation, e.g. in standby mode: using burst mode control
H02M 1/0058
Transistor switching losses: by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current…

Synchronous rectifier control

Life of this patent

Synchronous rectifier control

Life of this patent

Abstract

Claims20