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公开(公告)号：US09112467B1
公开(公告)日：2015-08-18
申请号：US13652939
申请日：2012-10-16
Applicant: Cirrus Logic, Inc.
Inventor： John Christopher Tucker , Daniel John Allen , John L. Melanson , Ammisetti Prasad
CPC classification number: H03G3/004 , H02M3/07 , H03F1/0227 , H03F1/025 , H03F3/183 , H03F2200/03 , H03F2200/211 , H03F2200/507 , H03G3/20 , H03G3/3031
Abstract: An energy-efficient consumer device audio power output stage with gain control provides improved battery life and reduced power dissipation without clipping the audio output signal. A power supply having a selectable operating mode supplies the power supply rails to the power amplified output stage. The operating mode is controlled in conformity with an input audio signal level, which may be determined from a volume control setting of the device and/or from a signal level detector that determines the amplitude of the signal being amplified. The gain applied to the audio input signal is reduced for a predetermined time period when a higher output voltage of the power supply is selected, to avoid clipping the audio output signal.
Abstract translation: 具有增益控制功能的节能消费电子设备音频功率输出级能够提高电池寿命，降低功耗，同时不会影响音频输出信号。 具有可选操作模式的电源将电源轨提供给功率放大输出级。 操作模式根据输入音频信号电平进行控制，输入音频信号电平可以根据设备的音量控制设置和/或从确定被放大的信号的幅度的信号电平检测器确定。 当选择电源的较高输出电压时，施加到音频输入信号的增益在预定时间段内减小，以避免削波音频输出信号。
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Patent Agency Ranking
公开(公告)号：US09912312B2
公开(公告)日：2018-03-06
申请号：US14182850
申请日：2014-02-18
Applicant: Cirrus Logic, Inc.
Inventor： Ullas Pazhayaveetil , Jeffrey May , Gautham Kamath , John Christopher Tucker , Christian Larsen
CPC classification number: H02M3/158 , G01R21/06 , G01R27/2611 , G06F1/3203 , H02M3/156 , H03F3/187 , H03F3/2175 , H03G3/004
Abstract: A controller of a boost converter may be configured to dynamically adjust conditions within the boost converter by monitoring conditions in the boost converter. For example, the controller may determine an current inductance value for an inductor of the boost converter by monitoring a current through the inductor. When the inductance value of the inductor is known, a slope compensation value may be used in determining a transition time between charging the inductor of the boost converter and discharging the inductor.
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公开(公告)号：US09287839B1
公开(公告)日：2016-03-15
申请号：US14056108
申请日：2013-10-17
Applicant: Cirrus Logic, Inc.
Inventor： Christophe Jean-Francois Amadi , Jason Lee Wardlaw , Emmanuel A. Marchais , Dylan Alexander Hester , Daniel John Allen , John Christopher Tucker
CPC classification number: H03F3/45659 , H03F1/02 , H03F1/26 , H03F1/34 , H03F3/187 , H03F3/45475 , H03F3/45753 , H03F2200/03 , H03F2203/45138 , H03F2203/45212 , H03F2203/45526 , H03F2203/45586 , H03G3/32
Abstract: A DC servo loop may track DC offset changes of an input signal and apply feedback to amplifiers to adjust a DC offset of the input signal. The DC servo loop may include digital loop tracking and analog loop tracking components. The digital loop tracking components may track small changes in the DC offset. When the DC offset exceeds a certain threshold, analog loop tracking may be activated to apply feedback to the amplifiers to adjust the DC offset. The adjustments to the DC offset may be delayed until an amplitude of the input signal exceeds a threshold to reduce contribution to noise in the input signal.
Abstract translation: DC伺服环路可以跟踪输入信号的DC偏移变化，并将反馈应用于放大器以调整输入信号的直流偏移。 DC伺服环路可以包括数字环路跟踪和模拟环路跟踪组件。 数字环路跟踪组件可以跟踪DC偏移的小变化。 当DC偏移超过某个阈值时，可以激活模拟环路跟踪以将反馈应用于放大器以调整DC偏移。 DC偏移的调整可能被延迟，直到输入信号的幅度超过阈值以减小输入信号中对噪声的贡献。
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公开(公告)号：US09705458B1
公开(公告)日：2017-07-11
申请号：US14812405
申请日：2015-07-29
Applicant: Cirrus Logic, Inc.
Inventor： John Christopher Tucker , Daniel John Allen , John L. Melanson , Ammisetti Prasad
CPC classification number: H03G3/004 , H02M3/07 , H03F1/0227 , H03F1/025 , H03F3/183 , H03F2200/03 , H03F2200/211 , H03F2200/507 , H03G3/20 , H03G3/3031
Abstract: An energy-efficient consumer device audio power output stage with gain control provides improved battery life and reduced power dissipation without clipping the audio output signal. A control circuit controls a power supply that supplies the power supply rails to the power amplified output stage. The voltage of the power supply rails is controlled in conformity with an input audio signal level, which may be determined from a volume control setting of the device and/or from a signal level detector that determines the amplitude of the signal being amplified. The gain applied to the audio input signal is reduced for a predetermined time period when a higher output voltage of the power supply is selected, to avoid clipping the audio output signal.
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公开(公告)号：US20150032396A1
公开(公告)日：2015-01-29
申请号：US14182850
申请日：2014-02-18
Applicant: Cirrus Logic, Inc.
Inventor： Ullas Pazhayaveetil , Jeffrey May , Gautham Kamath , John Christopher Tucker , Christian Larsen
IPC: G01R27/26
CPC classification number: H02M3/158 , G01R21/06 , G01R27/2611 , G06F1/3203 , H02M3/156 , H03F3/187 , H03F3/2175 , H03G3/004
Abstract: A controller of a boost converter may be configured to dynamically adjust conditions within the boost converter by monitoring conditions in the boost converter. For example, the controller may determine an current inductance value for an inductor of the boost converter by monitoring a current through the inductor. When the inductance value of the inductor is known, a slope compensation value may be used in determining a transition time between charging the inductor of the boost converter and discharging the inductor.
Abstract translation: 升压转换器的控制器可以被配置为通过监视升压转换器中的条件来动态地调节升压转换器内的状况。 例如，控制器可以通过监视通过电感器的电流来确定升压转换器的电感器的电流电感值。 当电感器的电感值已知时，可以使用斜率补偿值来确定对升压转换器的电感器充电和放电电感器之间的转换时间。
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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
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.
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