Power supply for class d amplifier in energy efficient applications
AssigneeRGB Systems, Inc.
InventorEric Mendenhall
Life of this patent
Estimating the term…
Abstract
A power supply for use with Class D amplifiers in energy efficient applications is described herein. The power supply reduces the effects of off side charging and improves cross regulation. The topology of the power supply can be designed to minimize quiescent mode losses through resonant switching of some or all active switches. Additionally, the power supply can be implemented without external resonant inductors, the power supply can be implemented with smaller capacitors that have longer lifetime ratings, the switching losses present in a power factor correction stage of the power supply can be reduced, and/or a modified power factor correction choke can be utilized to reduce energy loss.
Claims20
An apparatus comprising:
- a positive output;
- a negative output;
- a first transformer comprising a first primary side and a first secondary side, wherein the first primary side comprises a first set of transistors and a first inductor coupled to the first set of transistors, and wherein the first inductor produces a magnetized inductance;
- a second transformer comprising a second primary side and a second secondary side;
- a second set of transistors coupled to the second primary side of the second transformer, wherein the first transformer is configured to drive the second set of transistors;
- a first set of synchronous rectifiers coupled to the second secondary side of the second transformer, wherein the first set of synchronous rectifiers are further coupled to the positive output, and wherein the first transformer is further configured to drive the first set of synchronous rectifiers;
- and
- a second set of synchronous rectifiers coupled to the second secondary side of the second transformer, wherein the second set of synchronous rectifiers are further coupled to the negative output and the first set of synchronous rectifiers, and wherein the first transformer is further configured to drive the second set of synchronous rectifiers.
(canceled)
A method comprising:
- driving, by a first transformer, a first set of transistors, wherein a second transformer comprises a primary side and a secondary side, and wherein the first set of transistors is coupled to the primary side, wherein the first transformer comprises a second primary side and a second secondary side, wherein the second primary side comprises a second set of transistors and a first inductor coupled to the second set of transistors, and wherein the first inductor produces a magnetized inductance;
- driving, by the first transformer, a first set of synchronous rectifiers, wherein the first set of synchronous rectifiers is coupled to the secondary side;
- driving, by the first transformer, a second set of synchronous rectifiers, wherein the second set of synchronous rectifiers is coupled to the secondary side;
- generating, by the first set of synchronous rectifiers, a positive output;
- and
- generating, by the second set of synchronous rectifiers, a negative output.
(canceled)
Dependencies are inferred from the claim text.