公开(公告)号：US20150257218A1

公开(公告)日：2015-09-10

申请号：US14639843

申请日：2015-03-05

Applicant: Cirrus Logic, Inc.

Inventor： Erik J. Mentze ,  Karl Thompson

IPC: H05B33/08

CPC classification number: H05B33/0815 ,  H02M1/36 ,  H02M2001/0045 ,  H05B33/0812 ,  H05B33/0845 ,  H05B33/0851 ,  H05B33/0887 ,  H05B37/00

Abstract: Power consumption in a start-up circuit for a LED-based light bulb may be reduced by digitally switching a transistor of the start-up circuit coupled to the input voltage. When the transistor is digitally switched between on and off, a reduced amount of power is dissipated by the transistor, because it may not enter a saturation region of operation where the resistance of the transistor between drain and source terminals increases. The transistor may be coupled to a voltage regulator for generating one or more output voltages, including a supply voltage for a host controller IC. The transistor may be switched on and off by a digital signal generated by logic circuitry, which may decide to switch the transistor on and off based on a voltage level at an output of the voltage regulator.

Abstract translation: 通过数字地切换耦合到输入电压的启动电路的晶体管，可以减少基于LED的灯泡的启动电路中的功耗。 当晶体管在导通和截止之间进行数字切换时，晶体管消耗的功率减少，因为它可能不会进入饱和的工作区域，其中漏极和源极端子之间的晶体管的电阻增加。 晶体管可以耦合到电压调节器，用于产生一个或多个输出电压，包括用于主机控制器IC的电源电压。 晶体管可以由逻辑电路产生的数字信号导通和截止，逻辑电路可以基于电压调节器的输出端的电压电平决定开关晶体管。

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

IPC: H03F99/00 ,  H03G3/20 ,  H02M3/07 ,  H03F1/02

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。

公开(公告)号：US09088237B2

公开(公告)日：2015-07-21

申请号：US13827848

申请日：2013-03-14

Applicant: Cirrus Logic, Inc.

Inventor： Stephen James Sanchez ,  Marc John Kobayashi ,  Branislav Pjetar ,  John L. Melanson

IPC: H02P6/18

CPC classification number: H02P6/183 ,  H02P6/182

Abstract: A system for controlling motor switching in a sensorless BLDC having a stator with three stator windings and a permanent magnet rotor. The system includes a controller unit comprising a control signal generator, a memory device, a processing unit, a signal acquisition device, and an analog-to-digital converter. A power stage controlled by the controller unit has a plurality of switches and drives two windings of the three stator windings with a pulse width modulation signal and leaves one stator of the three stator windings undriven. The processing unit acquires a demodulated measured voltage on the undriven winding. The processing unit calculates a threshold at which the power stage will change which two windings of the three stator windings are driven when the demodulated measured voltage surpasses the threshold.

Abstract translation: 一种用于控制具有三个定子绕组的定子和一个永磁转子的无传感器BLDC中的电动机切换的系统。 该系统包括控制器单元，其包括控制信号发生器，存储器件，处理单元，信号采集器件和模数转换器。 由控制器单元控制的功率级具有多个开关并利用脉宽调制信号驱动三个定子绕组的两个绕组，并且使三个定子绕组中的一个定子不被驱动。 处理单元获取未驱动绕组上的解调测量电压。 当解调的测量电压超过阈值时，处理单元计算功率级将改变三个定子绕组的两个绕组被驱动的阈值。

公开(公告)号：US09035587B2

公开(公告)日：2015-05-19

申请号：US13827031

申请日：2013-03-14

Applicant: Cirrus Logic, Inc.

Inventor： John Laurence Melanson

IPC: H02P6/00 ,  H02P6/18

CPC classification number: H02P6/18 ,  H02P21/18 ,  H02P21/22 ,  H02P21/24

Abstract: A system and method of controlling a motor are disclosed. The system comprises a current observer for observing a motor current at a sampling rate and a proportionate-integral controller that provides a proportionate path and an integral path and at least forms part of a proportionate-integral control loop based on the motor current. The current observer observes a motor current of the motor at a sampling rate. The proportionate path calculates, for a present cycle of the sampling rate, a proportionate path term for the proportionate-integral control loop based on the motor current. The system outputs a respective motor output voltage to the motor in conformity with the proportionate path term calculated for the present cycle. In conformity with the motor current, the integral path calculates an integral path term for another respective motor output voltage to be used in a later cycle of the sampling rate.

Abstract translation: 公开了一种控制电动机的系统和方法。 该系统包括用于以采样率观察电动机电流的当前观察者，以及提供比例路径和积分路径的比例积分控制器，并且至少形成基于电动机电流的比例积分控制回路的一部分。 当前的观察者以采样率观察电动机的电动机电流。 比例路径针对采样率的当前周期计算基于电动机电流的比例积分控制回路的比例路径项。 系统根据为本周期计算的比例路径项将相应的电动机输出电压输出到电动机。 根据电动机电流，积分路径计算在随后的采样率循环中使用的另一个相应的电动机输出电压的积分路径项。

公开(公告)号：US20150104032A1

公开(公告)日：2015-04-16

申请号：US14578567

申请日：2014-12-22

Applicant: Cirrus Logic, Inc.

Inventor： Nitin Kwatra ,  Jeffrey Alderson ,  Jon D. Hendrix

IPC: G10L21/0208 ,  G10K11/175 ,  H04M1/20

CPC classification number: G10L21/0208 ,  G10K11/175 ,  G10K11/178 ,  G10K2210/108 ,  G10K2210/30231 ,  G10K2210/30391 ,  G10K2210/503 ,  H04M1/20

Abstract: A personal audio device, such as a wireless telephone, includes noise canceling 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 may also be provided proximate the speaker to estimate an electro-acoustical path from the noise canceling circuit through the transducer. A processing circuit uses the reference and/or error microphone, optionally along with a microphone provided for capturing near-end speech, to determine whether one of the reference or error microphones is obstructed by comparing their received signal content and takes action to avoid generation of erroneous anti-noise.

Abstract translation: 诸如无线电话的个人音频设备包括噪声消除电路，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到扬声器或其它换能器输出中以引起环境音频声音的消除。 还可以在扬声器附近提供误差麦克风以估计从噪声消除电路通过换能器的电声路径。 处理电路使用参考和/或误差麦克风，可选地与提供用于捕获近端语音的麦克风一起，通过比较其接收的信号内容来确定参考或误差麦克风中的一个是否被阻挡，并采取行动以避免产生 错误的抗噪声。

公开(公告)号：US08994306B2

公开(公告)日：2015-03-31

申请号：US13835101

申请日：2013-03-15

Applicant: Cirrus Logic, Inc.

Inventor： Marc John Kobayashi ,  Jason William Lawrence ,  Stephen James Sanchez ,  John L. Melanson ,  Miroslav Olijaca

IPC: H02P1/04 ,  H02P6/18

CPC classification number: H02P6/183 ,  H02P6/185

Abstract: The system and method disclose for the controlling of sequential phase switching in driving a set of stator windings of a multi-phase sensorless brushless permanent magnet DC motor. A motor controller controls a power stage that drives two windings of a set of three windings in the motor with pulse width modulated signal. A plurality of voltage values on an undriven winding of the set of three windings are sampled within a window of time, wherein a period beginning when the driven windings are energized and ending when the driven windings are de-energized encompasses the window of time. The sampled voltage values are processed. When the processed voltage values exceed a threshold, the motor controller changes which two windings are driven.

Abstract translation: 该系统和方法公开了用于控制驱动多相无传感器无刷永磁直流电动机的一组定子绕组中的顺序相位切换。 电机控制器控制功率级，通过脉宽调制信号驱动马达中一组三个绕组的两个绕组。 在三个绕组组中的未驱动绕组上的多个电压值在时间窗口内被采样，其中从被驱动绕组通电并且当从动绕组断电时结束的周期包括时间窗口。 对采样的电压值进行处理。 当处理的电压值超过阈值时，电机控制器改变驱动两个绕组。

公开(公告)号：US20150078559A1

公开(公告)日：2015-03-19

申请号：US14036136

申请日：2013-09-25

Applicant: Cirrus Logic, Inc.

Inventor： Anand Ilango ,  Daniel John Allen ,  Aniruddha Satoskar

IPC: H04R29/00

CPC classification number: H04R3/007 ,  G10K11/17854 ,  G10K11/17881 ,  G10K11/17885 ,  G10K2210/1081 ,  G10K2210/30232 ,  G10K2210/3045 ,  G10K2210/3049 ,  H03F1/0211 ,  H03F1/0227 ,  H03F1/52 ,  H03F3/181 ,  H03F3/183 ,  H03F3/185 ,  H03F3/52 ,  H03F2200/03 ,  H03F2200/462 ,  H03F2200/471 ,  H04R5/04 ,  H04R29/001 ,  H04R2420/05

Abstract: In accordance with systems and methods of the present disclosure, an audio device may include an electrical terminal, an audio circuit, and a transducer load detection circuit. The electrical terminal may couple a transducer device to the audio device. The audio circuit may generate an analog audio signal, wherein the analog audio signal is coupled to the electrical terminal The transducer load detection circuit may detect a load impedance of the transducer device when the transducer device is coupled to the audio device from characteristics measured at the electrical terminal.

公开(公告)号：US08981661B2

公开(公告)日：2015-03-17

申请号：US14084662

申请日：2013-11-20

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Eric King

IPC: H05B41/16 ,  H05B37/02 ,  H05B33/08

CPC classification number: H05B33/0815 ,  H05B33/0845 ,  H05B37/0263 ,  Y02B20/346

Abstract: A circuit for powering high-efficiency lighting devices from a thyristor-controlled dimmer operates a switching power circuit during active portions of half-cycles of the AC line voltage source that supplies the dimmer. A control circuit determines the durations of the active portions such that sufficient energy is transferred to operate the lighting devices until a next half-cycle of the AC line voltage, at which time the active portion of the half-cycle is terminated. A high impedance level is presented to the output of the dimmer until the next half-cycle commences.

Abstract translation: 用于从晶闸管控制的调光器供电高效率照明装置的电路在提供调光器的AC线路电压源的半周期的有效部分期间操作开关电源电路。 控制电路确定有效部分的持续时间，使得传送足够的能量以操作照明装置，直到AC线路电压的下一个半周期，此时半周期的有效部分终止。 高阻抗电平被提供给调光器的输出，直到下一个半周期开始。

公开(公告)号：US08970413B1

公开(公告)日：2015-03-03

申请号：US13799323

申请日：2013-03-13

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Rahul Singh ,  Prashanth Drakshapalli ,  Dale Brummel

IPC: H03M3/00 ,  H03M1/00

CPC classification number: H03M3/32

Abstract: A low power analog-to-digital converter (ADC) may sense current output of a geophone instead of voltage. The output of the geophone may be terminated through a resistor into a virtual ground of an integrator, which may be located inside a current mode delta-sigma analog-to-digital converter. The integrator may have a current mode or a charge mode feedback. Thus, the geophone may experience constant or substantially constant impedance terminated into a virtual ground. This approach may eliminate an instrumentation amplifier from a geophone sensing circuit, while still allowing for accurate sensing of geophone signals. The instrumentation amplifier is a major current consumer from the signal path, so its elimination may significantly reduce power consumption. The instrumentation amplifier may be eliminated, at least in part because of the provision of the resistance into a virtual ground of an integrator of the delta-sigma ADC.

Abstract translation: 低功耗模数转换器（ADC）可以感测地震检波器的电流输出而不是电压。 地震检波器的输出可以通过电阻器终止到积分器的虚拟地，该积分器可以位于电流模式的Δ-Σ模数转换器内。 积分器可以具有电流模式或充电模式反馈。 因此，地震检波器可能经历恒定或基本恒定的阻抗终止于虚拟地面。 这种方法可以从地震检波器感测电路中消除仪表放大器，同时仍能准确地感测地震检波器信号。 仪表放大器是信号路径的主要消费者，因此其消除可能显着降低功耗。 至少部分地由于向Δ-ΣADC的积分器的虚拟接地提供电阻，可以消除仪表放大器。

公开(公告)号：US20150054418A1

公开(公告)日：2015-02-26

申请号：US14477297

申请日：2014-09-04

Applicant: Cirrus Logic, Inc.

Inventor： Eric J. King ,  John L. Melanson

IPC: H05B33/08 ,  H05B37/02

CPC classification number: H05B33/0815 ,  H05B37/02 ,  H05B39/044 ,  Y10S315/04

Abstract: A system and method includes a controller that is configured to coordinate (i) a low impedance path for a dimmer current, (ii) attaching a dimmer to a power converter system at the leading edge of a phase-cut, rectified input voltage, (iii), control of switch mode power conversion, and (iv) an inactive state to, for example, reduce the dimmer current while allowing a dimmer to function normally from cycle to cycle of an alternating current (AC) supply voltage. In at least one embodiment, the dimmer functions normally when the dimmer conducts at a correct phase angle indicated by a dimmer input setting and avoids prematurely resetting while conducting. In at least one embodiment, by coordinating functions (i), (ii), (iii), and (iv) the controller controls a power converter system that is compatible with a triac-based dimmer.

Abstract translation: 一种系统和方法包括控制器，其被配置为协调（i）用于调光器电流的低阻抗路径，（ii）在相切割整流的输入电压的前沿将调光器附接到功率转换器系统（ iii），开关模式功率转换的控制，以及（iv）非活动状态，例如降低调光器电流，同时允许调光器从交流（AC）电源电压的周期到周期正常工作。 在至少一个实施例中，当调光器以由调光器输入设置指示的正确相位角传导时，调光器正常工作，并避免在导通时过早复位。 在至少一个实施例中，通过协调功能（i），（ii），（iii）和（iv），控制器控制与基于三端双向可控硅的调光器兼容的功率转换器系统。