公开(公告)号：US09912238B1

公开(公告)日：2018-03-06

申请号：US14182939

申请日：2014-02-18

Applicant: Cirrus Logic, Inc.

Inventor： Ullas Pazhayaveetil ,  Jeffrey May ,  Gautham D. Kamath ,  John Christopher Tucker ,  Christian Larsen

IPC: G05F1/00 ,  H02M3/158 ,  H02M3/156

CPC classification number: H02M3/158 ,  G01R21/06 ,  G01R27/2611 ,  G06F1/3203 ,  H02M3/156 ,  H03F3/187 ,  H03F3/2175 ,  H03G3/004

Abstract: During operation of a boost converter conditions may exist that result in a reverse current through the boost converter, such as when a load drop from the boost converter occurs. During the reverse current period, inductance value determinations made during a forward current period may be used to estimate a magnitude of the reverse current and this estimate used by a controller to control the boost converter and return the boost converter to normal operation. The controller may control the boost converter by changing a ratio of charging and discharging time for an inductor of the boost converter, decreasing a bandwidth of the boost converter, and/or increasing a resistance of the boost converter.

公开(公告)号：US09742370B2

公开(公告)日：2017-08-22

申请号：US15350431

申请日：2016-11-14

Applicant: Cirrus Logic, Inc.

Inventor： Ullas Pazhayaveetil ,  Jeffrey May ,  Anu Chakravarty ,  Gautham D. Kamath ,  John C. Tucker ,  Christian Larsen

IPC: H03G3/00 ,  G01R27/26 ,  G01R21/06 ,  G06F1/32 ,  H02M3/158 ,  H03F3/187 ,  H03F3/217

CPC classification number: H02M3/158 ,  G01R21/06 ,  G01R27/2611 ,  G06F1/3203 ,  H02M3/156 ,  H03F3/187 ,  H03F3/2175 ,  H03G3/004

Abstract: Audio amplification may be improved by controlling an audio amplifier based on the audio signal being amplified. For example, when the audio signal level increases or decreases, a boost voltage provided to an audio amplifier by a boost converter may also be increased or decreased. In another example, when the audio signal level decrease below a certain level, the audio amplifier may be switched from amplifying the audio signal with a boost converter input to amplifying the audio signal with a low voltage input. Control of the audio amplifier may be implemented in a digital boost converter controller coupled to the boost converter and/or the audio amplifier.

公开(公告)号：US09768689B1

公开(公告)日：2017-09-19

申请号：US14183096

申请日：2014-02-18

Applicant: Cirrus Logic, Inc.

Inventor： Ullas Pazhayaveetil ,  Jeffrey May ,  Gautham D. Kamath ,  Michael Kost

IPC: H02M3/158 ,  H02M3/156

CPC classification number: H02M3/158 ,  G01R21/06 ,  G01R27/2611 ,  G06F1/3203 ,  H02M3/156 ,  H03F3/187 ,  H03F3/2175 ,  H03G3/004

Abstract: Thermal levels in an inductor of a boost converter may be managed by implementing peak current limits for the boost converter. For example, an inductor may be allowed to conduct above a certain peak current limit for a certain period of time before the current is reduced by a controller to a low current limit. The controller may hold the low current limit in place for a certain period of time, after which the current through the inductor is allowed to again exceed the low current limit. However, if the high current limit is again exceeded or sustained for a certain period of time, the low current limit may be again imposed by the controller.

公开(公告)号：US20170063318A1

公开(公告)日：2017-03-02

申请号：US15350431

申请日：2016-11-14

Applicant: Cirrus Logic, Inc.

Inventor： Ullas Pazhayaveetil ,  Jeffrey May ,  Anu Chakravarty ,  Gautham D. Kamath ,  John C. Tucker ,  Christian Larsen

IPC: H03G3/00 ,  H03F3/217 ,  H03F3/187

CPC classification number: H02M3/158 ,  G01R21/06 ,  G01R27/2611 ,  G06F1/3203 ,  H02M3/156 ,  H03F3/187 ,  H03F3/2175 ,  H03G3/004

Abstract: Audio amplification may be improved by controlling an audio amplifier based on the audio signal being amplified. For example, when the audio signal level increases or decreases, a boost voltage provided to an audio amplifier by a boost converter may also be increased or decreased. In another example, when the audio signal level decrease below a certain level, the audio amplifier may be switched from amplifying the audio signal with a boost converter input to amplifying the audio signal with a low voltage input. Control of the audio amplifier may be implemented in a digital boost converter controller coupled to the boost converter and/or the audio amplifier.

Abstract translation: 可以通过基于被放大的音频信号控制音频放大器来改善音频放大。 例如，当音频信号电平增加或减小时，升压转换器提供给音频放大器的升压电压也可以增加或减小。 在另一示例中，当音频信号电平降低到低于某一水平时，可以利用升压转换器输入将音频放大器切换成放大音频信号，以便以低电压输入放大音频信号。 可以在耦合到升压转换器和/或音频放大器的数字升压转换器控制器中实现音频放大器的控制。