公开(公告)号：US09215765B1

公开(公告)日：2015-12-15

申请号：US13889926

申请日：2013-05-08

Applicant: Cirrus Logic, Inc.

Inventor： Wesley L. Mokry ,  Michael A. Kost ,  Eric Jerome King

IPC: H05B37/00 ,  H05B39/00 ,  H05B33/08 ,  H02M7/217

CPC classification number: H05B37/02 ,  H02M1/36 ,  H02M7/217 ,  H02M2001/0045 ,  H05B33/0812 ,  Y02B20/343

Abstract: In accordance with embodiments of the present disclosure, a system and method for providing compatibility between a load having a reactive impedance during steady-state operation and a secondary winding of an electronic transformer driven by a leading-edge dimmer may include a first circuit and a second circuit. The first circuit may cause the load to have a substantially non-reactive impedance when the first circuit is enabled. The second circuit may enable the first circuit to cause the load to have the substantially non-reactive impedance during a duration of time following start-up of the electronic transformer and disable the first circuit after the duration such that the load has the reactive impedance during steady-state operation of the load.

Abstract translation: 根据本公开的实施例，用于在稳态操作期间具有无功阻抗的负载和由前沿调光器驱动的电子变压器的次级绕组之间提供兼容性的系统和方法可以包括第一电路和 第二电路。 当第一电路被使能时，第一电路可能导致负载具有基本上无电阻的阻抗。 第二电路可以使得第一电路使得负载在电子变压器起动之后的持续时间内具有基本上无功的阻抗，并且在持续时间之后禁用第一电路，使得负载在 负载的稳态运行。

公开(公告)号：US09209762B1

公开(公告)日：2015-12-08

申请号：US14061912

申请日：2013-10-24

Applicant: Cirrus Logic, Inc.

Inventor： Yousof Mortazavi ,  Arash Mashayekhi ,  Mohammad Ranjbar

IPC: H03F3/217 ,  H03F3/185

CPC classification number: H03F3/217 ,  H03F1/305 ,  H03F3/185 ,  H03F3/2171 ,  H03F3/2175

Abstract: In a switched-power amplifier that has controlled power supply rails, e.g., when a volume control is implemented by varying the power supply voltages, a rate-controlled power supply control circuit eliminates audible pops that would otherwise occur when a change in input level causes the power supply rail voltages to change. The control circuit generates control signals that control the regulators providing the power supply rails with a controlled rate of change such that asymmetry between the voltages of the power supply rail outputs during changes of the power supply rails is substantially reduced. The controlled rate of change is less than or equal to the slowest rate of change of the power supply outputs that supply the power supply rails of the switched-power amplifier.

Abstract translation: 在具有受控电源轨的开关功率放大器中，例如，当通过改变电源电压来实现音量控制时，速率控制的电源控制电路消除了当输入电平变化导致的可能出现的声音 电源轨电压发生变化。 所述控制电路产生控制信号，所述控制信号控制所述调节器为所述电源轨提供控制的变化率，使得在所述电源轨的变化期间所述电源轨输出的电压之间的不对称性大大降低。 控制变化率小于或等于提供开关功率放大器的电源轨的电源输出的最慢变化率。

公开(公告)号：US09209685B2

公开(公告)日：2015-12-08

申请号：US14088637

申请日：2013-11-25

Applicant: Cirrus Logic, Inc.

Inventor： Alfredo R. Linz ,  Shatam Agarwal ,  Kan Wang

IPC: H02M5/42 ,  H02M3/156 ,  H05B37/02 ,  H02M7/04 ,  H05B33/08

CPC classification number: H02M3/156 ,  H02M7/04 ,  H05B33/0851 ,  H05B37/0227

Abstract: A variable resistance device may be used in a dimmer compatibility circuit to reduce power dissipation in an integrated circuit of the dimmer compatibility circuit. For example, the integrated circuit may include switches coupled to resistors external to the integrated circuit. The integrated circuit may operate the switches to commutate among the external resistors and select a voltage drop that reduces a voltage at a drain voltage of the switches. The reduced drain voltage reduces power dissipation in the switches and instead dissipates the power in the external resistors.

Abstract translation: 可变电阻器件可用于调光器兼容性电路中以减少调光器兼容性电路的集成电路中的功率耗散。 例如，集成电路可以包括耦合到集成电路外部的电阻器的开关。 集成电路可以操作开关以在外部电阻器之间进行换向，并选择降压开关漏极电压的电压降。 降低的漏极电压降低了开关中的功耗，并消除了外部电阻器的电源。

公开(公告)号：US09208771B2

公开(公告)日：2015-12-08

申请号：US14062951

申请日：2013-10-25

Applicant: Cirrus Logic, Inc.

Inventor： Dayong Zhou ,  Yang Lu ,  Jon D. Hendrix ,  Jeffrey Alderson

IPC: G10K11/178

CPC classification number: G10K11/178 ,  G10K2210/1081 ,  G10K2210/3016 ,  G10K2210/3022 ,  G10K2210/3026 ,  G10K2210/3028

Abstract: An adaptive noise canceller adapts a secondary path modeling response using ambient noise, rather than using another noise source or source audio as a training source. Anti-noise generated from a reference microphone signal using a first adaptive filter is used as the training signal for training the secondary path response. Ambient noise at the error microphone is removed from an error microphone signal, so that only anti-noise remains. A primary path modeling adaptive filter is used to modify the reference microphone signal to generate a source of ambient noise that is correlated with the ambient noise present at the error microphone, which is then subtracted from the error microphone signal to generate the error signal. The primary path modeling adaptive filter is previously adapted by minimizing components of the error microphone signal appearing in an output of the primary path adaptive filter while the anti-noise signal is muted.

Abstract translation: 自适应噪声消除器使用环境噪声来适应次级路径建模响应，而不是使用另一噪声源或源音频作为训练源。 使用第一自适应滤波器从参考麦克风信号产生的抗噪声被用作用于训练辅助路径响应的训练信号。 错误麦克风处的环境噪声从误差麦克风信号中消除，从而仅保留抗噪声。 主路径建模自适应滤波器用于修改参考麦克风信号以产生与误差麦克风上存在的环境噪声相关的环境噪声源，然后将其从误差麦克风信号中减去以产生误差信号。 先前通过使主路径自适应滤波器的输出中出现的误差麦克风信号的分量最小化，同时抗噪声信号被静音，来先适应主路径建模自适应滤波器。

公开(公告)号：US20150323947A1

公开(公告)日：2015-11-12

申请号：US14706680

申请日：2015-05-07

Applicant: Cirrus Logic, Inc.

Inventor： Christophe J. Amadi ,  Siddharth Maru ,  Eric J. King

IPC: G05F1/575

CPC classification number: H03F1/083 ,  G05F1/575 ,  H02M3/158 ,  H03F1/0277 ,  H03F3/181 ,  H03F3/217 ,  H03F3/2178 ,  H03F2200/03 ,  H03F2200/372

Abstract: In accordance with embodiments of the present disclosure, a system may include an impedance estimator configured to estimate an impedance of a load and generate a target current based at least on an input voltage and the impedance, a voltage feedback loop responsive to a difference between the input voltage and an output voltage of the load, and a current controller configured to, responsive to the voltage feedback loop, the impedance estimator, and the input voltage, generate an output current to the load.A controller may be configured to sequentially apply switch configurations to a power converter to selectively activate or deactivate each of a plurality of switches of the power converter in accordance with a selected operational mode of the power converter, wherein the plurality of operational modes may include a single-ended buck mode for switching a polarity of the output voltage in which: during a charging phase, at least one of the plurality of switches is activated such that a power inductor is coupled between a first terminal of a power source and a particular one of the first output terminal and the second output terminal; and during a transfer phase, at least one of the plurality of switches is activated such that the power inductor is coupled between a second terminal of the power source and the particular one of the first output terminal and the second output terminal.A controller may be configured to sequentially apply a plurality of switch configurations of a power converter in order to operate the power converter as a differential output converter to switch a polarity of the output voltage, such that: during a charging phase of the power converter, a power inductor is coupled between one of a first terminal and a second terminal of the power source and one of a first terminal and a second terminal of the output load, during a transfer phase of the power converter, at least one of the plurality of switches is activated in order to couple the power inductor between the second terminal of the power source and one of the first terminal of the output load and the second terminal of the output load, wherein the output voltage comprises a differential voltage between the first terminal and the second terminal.A power converter may include a power inductor, a plurality of switches arranged to sequentially operate in a plurality of switch configurations, an output for producing the output voltage, wherein a first switch is coupled to a first output terminal of the output and a second switch is coupled to a second output terminal of the output, and a linear amplifier coupled to the output. The controller may be configured to, in a linear amplifier mode of the power stage, enable the linear amplifier to transfer electrical energy from an input source of the power stage to the load, and in at least one mode of the power stage other than the linear amplifier mode, sequentially apply switch configurations from the plurality of switch configurations to selectively activate or deactivate each of the plurality of switches in order to transfer the electrical energy from the input source to the load.

公开(公告)号：US09184661B2

公开(公告)日：2015-11-10

申请号：US13836423

申请日：2013-03-15

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Eric J. King

IPC: H02M3/335 ,  H05B33/08

CPC classification number: H02M3/335 ,  H05B33/0809 ,  H05B33/0815

Abstract: An electronic system includes a controller that actively controls a rate of charging and discharging of an energy storage capacitor to maintain compatibility with a dimmer. The controller actively controls charging of a capacitor circuit in a switching power converter to a first voltage level across the capacitor circuit. The controller further allows the capacitor to discharge to obtain a second voltage level across the capacitor circuit. The second voltage level is sufficient to draw a current through a phase-cut dimmer to prevent the dimmer from prematurely resetting. The first voltage is sufficient to allow the capacitor to discharge to the second voltage level during each cycle of the line voltage.

Abstract translation: 电子系统包括控制器，其主动地控制储能电容器的充电和放电速率以保持与调光器的兼容性。 控制器主动控制开关功率转换器中的电容器电路对电容器电路两端的第一电压电平的充电。 控制器还允许电容器放电以在电容器电路两端获得第二电压电平。 第二电压电平足以通过相位切割调光器画出电流，以防止调光器过早复位。 第一电压足以允许电容器在线路电压的每个周期期间放电到第二电压电平。

公开(公告)号：US20150296296A1

公开(公告)日：2015-10-15

申请号：US14252235

申请日：2014-04-14

Applicant: Cirrus Logic, Inc.

Inventor： Yang Lu ,  Dayong Zhou ,  Ning Li

IPC: H04R3/00 ,  H04R1/08

CPC classification number: H04R3/002 ,  G10K11/178 ,  G10K11/17817 ,  G10K11/17854 ,  G10K11/17881 ,  G10K11/17885 ,  G10K2210/108 ,  G10K2210/1081 ,  G10K2210/3028 ,  G10K2210/3049 ,  G10K2210/3056 ,  H04R1/08 ,  H04R1/1083 ,  H04R3/005 ,  H04R2410/05 ,  H04R2460/01

Abstract: A personal audio device includes an adaptive noise canceling (ANC) circuit that adaptively generates an anti-noise signal from a reference microphone signal and injects the anti-noise signal into the speaker or other transducer output to cause cancellation of ambient audio sounds. An error microphone is also provided proximate the speaker to provide an error signal indicative of the effectiveness of the noise cancellation. A secondary path estimating adaptive filter is used to estimate the electro-acoustical path from the noise canceling circuit through the transducer so that source audio can be removed from the error signal. Noise is injected so that the adaptation of the secondary path estimating adaptive filter can be maintained, irrespective of the presence and amplitude of the source audio. The noise is shaped by a noise shaping filter that has a response controlled in conformity with at least one parameter of the secondary path response.

Abstract translation: 个人音频设备包括自适应噪声消除（ANC）电路，其自适应地从参考麦克风信号产生抗噪声信号，并将抗噪声信号注入扬声器或其他换能器输出以引起环境音频声音的消除。 在扬声器附近还提供误差麦克风以提供指示噪声消除的有效性的误差信号。 二次路径估计自适应滤波器用于估计通过换能器的噪声消除电路的电声路径，从而可以从误差信号中去除源音频。 噪声被注入，使得可以维持二次路径估计自适应滤波器的适应，而不管源音频的存在和幅度如何。 噪声通过噪声整形滤波器成形，该滤波器的响应受到与次要路径响应的至少一个参数相一致的控制。

公开(公告)号：US09123321B2

公开(公告)日：2015-09-01

申请号：US13727718

申请日：2012-12-27

Applicant: Cirrus Logic, Inc.

Inventor： Jeffrey Alderson ,  Jon D. Hendrix ,  Dayong Zhou ,  Antonio John Miller ,  Chin Yong ,  Gautham Devendra Kamath

IPC: G01K11/16 ,  G10K11/16 ,  G10K11/178 ,  H04B3/23 ,  G10L21/0216

CPC classification number: G10K11/178 ,  G10K11/16 ,  G10K2210/00 ,  G10K2210/108 ,  G10K2210/3014 ,  G10K2210/3017 ,  G10K2210/3028 ,  G10K2210/30391 ,  G10L2021/02165 ,  H04B3/237

Abstract: A personal audio device, such as a wireless telephone, includes an adaptive noise canceling (ANC) circuit that adaptively generates an anti-noise signal from a reference microphone signal and injects the anti-noise signal into the speaker or other transducer output to cause cancellation of ambient audio sounds. An error microphone is also provided proximate to the speaker to provide an error signal indicative of the effectiveness of the noise cancellation. A secondary path estimating adaptive filter is used to estimate the electro-acoustical path from the noise canceling circuit through the transducer so that source audio can be removed from the error signal. Adaptation of adaptive filters is sequenced so that update of their coefficients does not cause instability or error in the update. A level of the source audio with respect to the ambient audio can be determined to determine whether the system may generate erroneous anti-noise and/or become unstable.

Abstract translation: 诸如无线电话的个人音频设备包括自适应噪声消除（ANC）电路，其自适应地从参考麦克风信号产生抗噪声信号，并将抗噪声信号注入扬声器或其他换能器输出以引起取消 的环境音频声音。 还提供了靠近扬声器的误差麦克风以提供指示噪声消除的有效性的误差信号。 二次路径估计自适应滤波器用于估计通过换能器的噪声消除电路的电声路径，从而可以从误差信号中去除源音频。 对自适应滤波器的适应进行排序，以便更新其系数不会导致更新中的不稳定或错误。 可以确定相对于环境音频的源音频的电平以确定系统是否可能产生错误的抗噪声和/或变得不稳定。

公开(公告)号：US09106989B2

公开(公告)日：2015-08-11

申请号：US14029159

申请日：2013-09-17

Applicant: Cirrus Logic, Inc.

Inventor： Ning Li ,  Antonio John Miller ,  Jon D. Hendrix ,  Jie Su ,  Jeffrey Alderson ,  Ali Abdollahzadeh Milani

IPC: H03B29/00 ,  H04R3/00 ,  G10K11/178

CPC classification number: H04R3/002 ,  G10K11/178 ,  G10K2210/1081 ,  G10K2210/3016 ,  G10K2210/3026 ,  G10K2210/3028 ,  H04R1/1083 ,  H04R2460/01

Abstract: Techniques for estimating adaptive noise canceling (ANC) performance in a personal audio device, such as a wireless telephone, provide robustness of operation by triggering corrective action when ANC performance is low, and/or by saving a state of the ANC system when ANC performance is high. An anti-noise signal is generated from a reference microphone signal and is provided to an output transducer along with program audio. A measure of ANC gain is determined by computing a ratio of a first indication of magnitude of an error microphone signal that provides a measure of the ambient sounds and program audio heard by the listener including the effects of the anti-noise, to a second indication of magnitude of the error microphone signal without the effects of the anti-noise. The ratio can be determined for different frequency bands in order to determine whether particular adaptive filters are trained properly.

Abstract translation: 用于估计诸如无线电话的个人音频设备中的自适应噪声消除（ANC）性能的技术通过在ANC性能低时通过触发纠正动作来提供鲁棒性，和/或通过在ANC性能时保存ANC系统的状态 高。 从参考麦克风信号产生抗噪声信号，并将其与节目音频一起提供给输出变换器。 ANC增益的量度通过计算提供环境声音的度量的误差麦克风信号的幅度的第一指示和包括抗噪声的影响的收听者听到的节目音频的第一指示与第二指示 的误差麦克风信号的幅度没有抗噪声的影响。 可以针对不同的频带来确定该比率，以便确定特定的自适应滤波器是否被适当地训练。

公开(公告)号：US20150222184A1

公开(公告)日：2015-08-06

申请号：US14612734

申请日：2015-02-03

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Eric J. King

IPC: H02M3/158

CPC classification number: H02M3/1582 ,  H02M3/1588 ,  H03F1/0227 ,  H03F3/181 ,  H03F3/217

Abstract: A switching power stage for producing an output voltage to a load may include a power converter and a controller. The power converter may include a power inductor and plurality of switches arranged to sequentially operate in a plurality of switch configurations. The controller may be configured to, based on a measured parameter associated with the switching power stage, select a selected operational mode of the power converter from a plurality of operational modes, and sequentially apply switch configurations from the plurality of switch configurations to selectively activate or deactivate each of the plurality of switches in order to transfer electrical energy from an input source of the power converter to the load in accordance with the selected operational mode.A switching power stage for producing an output voltage to a load may include a power converter and a controller. The power converter may include a power inductor and plurality of switches arranged to sequentially operate in a plurality of switch configurations. The controller may be configured to, based at least on an input signal to the switching power stage, determine the differential output voltage to be driven at the load, and based on the differential output voltage to be driven at the load, apply a switch configuration from the plurality of switch configurations to selectively activate or deactivate each of the plurality of switches in order to generate the differential output voltage.A method may include sequentially applying a plurality of switch configurations in a power converter to selectively activate or deactivate each of the plurality of switches in order operate the power converter as a differential output buck converter, such that: during a charging phase of the power converter, the power inductor is coupled between (i) one of a first terminal of a power source and a second terminal of the power source and (ii) one of a first terminal of the output load and a second terminal of the output load; during a transfer phase of the power converter, at least one of the plurality of switches is activated in order to couple the power inductor between the first terminal of the output load and a second terminal of the output load; and the output voltage comprises a differential voltage between the first and second terminal of the output load.