公开(公告)号：US10756689B2

公开(公告)日：2020-08-25

申请号：US16001502

申请日：2018-06-06

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Eric Lindemann ,  John L. Melanson ,  Eric J. King

IPC: H03G5/02 ,  H03G3/00 ,  H03G7/00 ,  H03G3/30 ,  H04R3/04 ,  G10L21/0272 ,  H03F3/183 ,  H03G11/00 ,  H03G9/00 ,  H03F3/217 ,  H03G9/02 ,  H03F1/02 ,  H03F3/187 ,  H04R17/00 ,  G10L25/21 ,  H03G5/00 ,  H03G5/16

Abstract: A system may include an input configured to receive a first signal representative of a second signal to be driven to an amplifier input of an amplifier, processing circuitry configured to process the first signal in order to generate the second signal from the first signal such that the processing circuitry limits a current driven by the amplifier to an output load of the amplifier, and an output configured to drive the second signal to the amplifier input.

公开(公告)号：US10128803B2

公开(公告)日：2018-11-13

申请号：US15136548

申请日：2016-04-22

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Tejasvi Das ,  John L. Melanson ,  Eric J. King

IPC: H03F3/183 ,  H03K5/1536 ,  H04R3/00 ,  H03F1/02 ,  H03F1/30 ,  H03F3/187 ,  H03F3/217

Abstract: An audio amplifier circuit for providing an output signal to an audio transducer may include a power amplifier and a control circuit. The power amplifier may include an audio input for receiving an audio input signal, an audio output for generating the output signal based on the audio input signal, and a power supply input for receiving a power supply voltage, wherein the power supply voltage is variable among at least a first supply voltage and a second supply voltage greater than the first supply voltage. The control circuit may be configured to predict, based on one or more characteristics of a signal indicative of the output signal, an occurrence of a condition for changing the power supply voltage, and responsive to predicting the occurrence of the condition, change, at an approximate zero crossing of the signal indicative of the output signal, the power supply voltage.

公开(公告)号：US20160308445A1

公开(公告)日：2016-10-20

申请号：US15130453

申请日：2016-04-15

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Eric J. King ,  Siddharth Maru ,  John L. Melanson

IPC: H02M3/158 ,  H02M1/44

CPC classification number: H02M3/158 ,  H02M1/42 ,  H02M1/44 ,  H02M2003/1566 ,  H03F1/0227

Abstract: A switching power stage for producing an output voltage to a load may include a configurable switched mode power converter and a controller. The power converter may include a power inductor, a plurality of switches arranged to sequentially operate in a plurality of switch configurations, and an output for producing the output voltage, the output comprising a first output terminal and a second output terminal. The controller may be configured to, for at least one range of magnitudes of the output voltage, control the plurality of switches to operate in at least three switching phases per switching cycle of the power converter in order to generate the output voltage, wherein switching cycles of the power converter are substantially approximately equal in period and control the plurality of switches to apply for each of the at least three switching phases a respective switch configuration of the plurality of switch configurations.

Abstract translation: 用于产生负载的输出电压的开关功率级可以包括可配置开关模式功率转换器和控制器。 功率转换器可以包括功率电感器，多个开关，被布置为依次操作多个开关配置，以及用于产生输出电压的输出，该输出包括第一输出端子和第二输出端子。 控制器可以被配置为，对于输出电压的大小的至少一个范围，控制多个开关以在功率转换器的每个开关周期的至少三个开关阶段中工作，以便产生输出电压，其中开关周期 功率转换器的周期基本上近似相等，并且控制多个开关以向至少三个开关阶段中的每一个应用多个开关配置的相应开关配置。