公开(公告)号：US20130342123A1

公开(公告)日：2013-12-26

申请号：US14012775

申请日：2013-08-28

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Eric J. King

IPC: H05B37/02

CPC classification number: H05B37/02 ,  H05B33/0815 ,  H05B33/0851 ,  H05B39/048

Abstract: In at least one embodiment, an electronic system includes a controller, and the controller provides compatibility between an electronic light source and a trailing edge dimmer. In at least one embodiment, the controller is capable of predicting an estimated occurrence of a trailing edge of a phase cut AC voltage and accelerating a transition of the phase cut AC voltage from the trailing edge to a predetermined voltage threshold. In at least one embodiment, the controller predicts an estimated occurrence of the trailing edge of the phase cut AC voltage on the basis of actual observations from one or more previous cycles of the phase cut AC voltage.

Abstract translation: 在至少一个实施例中，电子系统包括控制器，并且控制器提供电子光源和后缘调光器之间的兼容性。 在至少一个实施例中，控制器能够预测相切切AC电压的后沿的估计出现并且加速相切切断AC电压从后沿到预定电压阈值的转变。 在至少一个实施例中，控制器基于来自相切切断AC电压的一个或多个先前循环的实际观察值来预测相切切AC电压的后沿的估计出现。

公开(公告)号：US20130221871A1

公开(公告)日：2013-08-29

申请号：US13774914

申请日：2013-02-22

Applicant: CIRRUS LOGIC, INC.

Inventor： Eric J. King ,  John L. Melanson ,  Daniel J. Baker

IPC: H05B37/02

CPC classification number: H05B37/02 ,  H05B33/0815 ,  H05B33/0845

Abstract: In at least one embodiment, a system and method provide current compensation in a lighting system by controlling a lamp current to prevent a current through a triac-based dimmer from undershooting a holding current value. In at least one embodiment, at least one of the lamps includes a controller that controls circuitry in the lamp to draw more lamp current for a period of time than needed to illuminate a brightness of the lamp at a level corresponding to particular phase-cut angle of the supply voltage. By drawing more current than needed, the controller increases the dimmer current during the period of time to prevent the dimmer current from falling below the holding current value. In at least one embodiment, the period of time corresponds to a compensating pulse of the lamp current at a time when the dimmer current would otherwise fall below the holding current value.

Abstract translation: 在至少一个实施例中，系统和方法通过控制灯电流来提供照明系统中的电流补偿，以防止通过基于三端双向可控硅开关控制器的调光器的电流低于保持电流值。 在至少一个实施例中，灯中的至少一个包括控制器，该控制器控制灯中的电路，以在比与特定相切角对应的水平下照亮灯的亮度所需的时间段吸取更多的灯电流 的电源电压。 通过吸收比所需更多的电流，控制器在一段时间内增加调光器电流，以防止调光器电流降至保持电流值以下。 在至少一个实施例中，该时间段对应于当调光电流否则将低于保持电流值时的灯电流的补偿脉冲。

公开(公告)号：US10375475B2

公开(公告)日：2019-08-06

申请号：US14247771

申请日：2014-04-08

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  John C. Tucker

IPC: H04R3/02 ,  H04R3/00 ,  H03M3/00 ,  H03M7/32 ,  H03M7/36 ,  H03F1/26 ,  H03F3/16 ,  H04R29/00 ,  H04R19/04

Abstract: In accordance with embodiments of the present disclosure, a digital microphone system may include a microphone transducer and a digital processing system. The microphone transducer may be configured to generate an analog input signal indicative of audio sounds incident upon the microphone transducer. The digital processing system may be configured to convert the analog input signal into a first digital signal having a plurality (e.g., more than 3) of quantization levels, and in the digital domain, process the first digital signal to compress the first digital signal into a second digital signal having fewer quantization levels (e.g., +1, 0, −1) than that of the first digital signal.

公开(公告)号：US09847773B2

公开(公告)日：2017-12-19

申请号：US15491476

申请日：2017-04-19

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Paul Lesso

IPC: H03K3/01 ,  H03K3/011

CPC classification number: H03K3/011 ,  H03F1/303 ,  H03F3/2171 ,  H03K7/08 ,  H03M1/822

Abstract: Noise introduced in an output signal of a pulse-width modulator (PWM) may be reduced by changing the time duration that a switch is driving the output node. Because the power supplies coupled to the switches are the source of noise in the output signal of the PWM, the time duration that the power supplies are driving the output may be reduced to obtain a subsequent reduction in noise in the output signal. For example, when a small signal is desired to be output by the PWM, the switches may be operated for shorter time durations. Thus, the switches couple the noise sources to ground for a duration of a cycle to reduce contribution of noise to the output. But, when a larger signal is desired to be output by the PWM, the switches may be operated for longer time durations or the conventional time durations described above.

公开(公告)号：US09831839B2

公开(公告)日：2017-11-28

申请号：US15451882

申请日：2017-03-07

Applicant: Cirrus Logic, Inc.

Inventor： Eric J. King ,  Christophe J. Amadi ,  John L. Melanson

IPC: H03F1/08 ,  H03F3/217 ,  H03F3/185 ,  H03F1/02 ,  H03F3/181

CPC classification number: H03F3/2175 ,  H03F1/0277 ,  H03F1/083 ,  H03F3/181 ,  H03F3/185 ,  H03F3/217 ,  H03F3/2171 ,  H03F3/2173 ,  H03F3/2178 ,  H03F2200/03 ,  H03F2200/231

Abstract: A method for producing an output voltage to a load may include, in a power stage comprising power converter having 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 comprising a first output terminal and a second output terminal, controlling the linear amplifier to transfer electrical energy from the input source of the power stage to the load in accordance with one or more least significant bits of a digital input signal, and controlling the power converter in accordance with bits of the digital input signal other than the one or more least significant bits to 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 the input source of the power stage to the load.

公开(公告)号：US09735671B2

公开(公告)日：2017-08-15

申请号：US14280539

申请日：2014-05-16

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Ramin Zanbaghi ,  Jieyeon Choi ,  Firas Azrai ,  Rahul Singh ,  Siddharth Maru

IPC: H05B33/08 ,  H02M3/07 ,  H02M1/08 ,  H03K17/64 ,  H02M3/335 ,  H02M1/00

CPC classification number: H02M3/07 ,  H02M1/08 ,  H02M3/335 ,  H02M2001/0006 ,  H03K17/64 ,  H05B33/0815 ,  H05B33/0845

Abstract: A bipolar junction transistor (BJT) may be used to generate a supply voltage for operating a controller, such as a lighting controller for a LED-based light bulb. A base of the BJT may receive current generated from the supply voltage to control operation of the BJT. Although the base of the BJT would be at a lower voltage than the emitter, a base drive circuit may be coupled between the emitter and the base of the BJT to increase the voltage. As one example, the base drive circuit may be a charge pump. In another example, the BJT may function as its own charge pump. In yet another example, a positive and a negative base current of the BJT may be independently controlled to regulate an output supply voltage VDD from the BJT.

公开(公告)号：US20170222629A1

公开(公告)日：2017-08-03

申请号：US15491476

申请日：2017-04-19

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Paul Lesso

IPC: H03K3/011

CPC classification number: H03K3/011 ,  H03F1/303 ,  H03F3/2171 ,  H03K7/08 ,  H03M1/822

Abstract: Noise introduced in an output signal of a pulse-width modulator (PWM) may be reduced by changing the time duration that a switch is driving the output node. Because the power supplies coupled to the switches are the source of noise in the output signal of the PWM, the time duration that the power supplies are driving the output may be reduced to obtain a subsequent reduction in noise in the output signal. For example, when a small signal is desired to be output by the PWM, the switches may be operated for shorter time durations. Thus, the switches couple the noise sources to ground for a duration of a cycle to reduce contribution of noise to the output. But, when a larger signal is desired to be output by the PWM, the switches may be operated for longer time durations or the conventional time durations described above.

公开(公告)号：US09722620B1

公开(公告)日：2017-08-01

申请号：US15338818

申请日：2016-10-31

Applicant: Cirrus Logic, Inc.

Inventor： Ramin Zanbaghi ,  Yousof Mortazavi ,  John L. Melanson ,  Aaron Brennan

IPC: H03M1/06 ,  G10L19/00

CPC classification number: H03M1/0602 ,  G10L19/00 ,  H03M1/1004 ,  H03M1/1038 ,  H03M1/1042 ,  H03M1/188 ,  H03M1/60

Abstract: The overall performance of a dual-path ADC system may be improved by using a VCO-based ADC for small-amplitude signals and employing non-linear cancelation to remove nonlinearities in signals output by the VCO-based ADC. In particular, VCO-based dual-path ADC systems of this disclosure may be configured to receive a first digital signal from a first ADC and a second digital signal from a second ADC, wherein the second digital signal is more non-linear than the first digital signal. The dual-path systems may also be configured to determine one or more non-linear coefficients of the second digital signal based, at least in part, on processing of the first and second digital signals. The dual-path systems may be further configured to modify the second digital signal based, at least in part, on the determined one or more non-linear coefficients to generate a more linear second digital signal.

公开(公告)号：US09628909B2

公开(公告)日：2017-04-18

申请号：US14932803

申请日：2015-11-04

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Eric Swanson

IPC: H04R21/02 ,  H04R3/00 ,  H04R1/04 ,  H04W52/02 ,  H04R1/10 ,  H04R3/04 ,  H04R19/02 ,  H04R19/04 ,  H03G3/20

CPC classification number: H04R3/005 ,  H04R1/04 ,  H04R1/1041 ,  H04R3/04 ,  H04R19/02 ,  H04R19/04 ,  H04R2400/01 ,  H04R2499/11 ,  H04W52/0251 ,  H04W52/0254 ,  Y02D70/00 ,  Y02D70/1262 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/164 ,  Y02D70/168

Abstract: In accordance with methods and systems of the present disclosure, a mobile device may include an enclosure adapted such that the enclosure is readily transported by a user of the mobile device, a speaker associated with the enclosure for generating sound, and a controller within the enclosure, communicatively coupled to the speaker. The controller may be configured to receive a signal from the speaker, the signal induced at least in part by sound incident on the speaker other than sound generated by the speaker and process the signal.

公开(公告)号：US09590574B1

公开(公告)日：2017-03-07

申请号：US14176681

申请日：2014-02-10

Applicant: Cirrus Logic, Inc.

Inventor： Shahrzad Naraghi ,  Johann Gaboriau ,  John L. Melanson

IPC: H02M3/158 ,  H03F3/217 ,  H03F1/26 ,  H03F3/181

CPC classification number: H03F3/217 ,  H02M1/38 ,  H02M3/1588 ,  H02M2001/0029 ,  H03F1/26 ,  H03F3/181 ,  Y02B70/1466

Abstract: An audio switching power amplifier having an output with controlled-slope transitions maintains efficiency while avoiding uncontrolled non-overlap intervals during switching transitions. A pair of transistors forming a half-bridge that supplies an output signal at an output terminal of the amplifier are operated so that neither transistor is fully on during an overlap time period. A current source provides an output current to the output terminal during the non-overlap time period to control the output voltage while changing the transistor that conducts the output current from a first one of the pair of transistors to a second one of the pair of transistors. The current source may be provided by operation of one of the transistors in a current source configuration. The voltage of a gate of one of the transistors can be compared with a threshold to provide an indication of the current.

Abstract translation: 具有受控斜率转换的输出的音频开关功率放大器保持效率，同时在切换转换期间避免不受控制的非重叠间隔。 形成在放大器的输出端提供输出信号的半桥的一对晶体管被操作，使得在重叠时间段期间两个晶体管都不会完全导通。 电流源在非重叠时间周期期间向输出端提供输出电流，以在改变将输出电流从该对晶体管中的第一晶体管导通到该对晶体管中的第二晶体管的晶体管时控制输出电压 。 可以通过当前源配置中的晶体管之一的操作来提供电流源。 可以将晶体管中的一个的栅极的电压与阈值进行比较以提供电流的指示。