公开(公告)号：US20150171853A1

公开(公告)日：2015-06-18

申请号：US14104137

申请日：2013-12-12

Applicant: Cirrus Logic, Inc.

Inventor： Eric J. King ,  John L. Melanson

IPC: H03K17/13 ,  H05B33/08

CPC classification number: H03K17/13 ,  H05B33/0815 ,  H05B33/0845 ,  Y02B20/346

Abstract: In at least one embodiment, the controller senses a leading edge, phase cut AC input voltage value to a switching power converter during a cycle of the AC input voltage. The controller senses the voltage value at a time prior to a zero crossing of the AC input voltage and utilizes the voltage value to determine the approximate zero crossing. In at least one embodiment, by determining an approximate zero crossing of the AC input voltage, the controller is unaffected by any disturbances of the dimmer that could otherwise make detecting the zero crossing problematic. The particular way of determining an approximate zero crossing is a matter of design choice. In at least one embodiment, the controller approximates the AC input voltage using a function that estimates a waveform of the AC input voltage and determines the approximate zero crossing of the AC input voltage from the approximation of the AC input voltage.

Abstract translation: 在至少一个实施例中，控制器在交流输入电压的周期期间感测到开关功率转换器的前沿，相切割AC输入电压值。 控制器感测交流输入电压过零之前的电压值，并利用电压值来确定近似过零点。 在至少一个实施例中，通过确定AC输入电压的近似零交叉，控制器不受调光器的任何干扰影响，否则可能会使检测到零交叉问题。 确定近似过零点的具体方法是设计选择的问题。 在至少一个实施例中，控制器使用估计AC输入电压的波形的函数来近似AC输入电压，并根据AC输入电压的近似确定AC输入电压的近似过零点。

公开(公告)号：US09008344B2

公开(公告)日：2015-04-14

申请号：US13915767

申请日：2013-06-12

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Eric Swanson

IPC: H04R9/08 ,  H04R1/04 ,  H04W52/02 ,  H04R1/02 ,  H04M1/00

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.

Abstract translation: 根据本公开的方法和系统，移动设备可以包括适于使得外壳容易地由移动设备的用户传输的外壳，与外壳相关联的用于产生声音的扬声器以及外壳内的控制器 通信地耦合到扬声器。 控制器可以被配置为从扬声器接收信号，所述信号至少部分地由入射在扬声器上的声音引起，而不是由扬声器产生的声音并且处理该信号。

公开(公告)号：US20150028768A1

公开(公告)日：2015-01-29

申请号：US14341984

申请日：2014-07-28

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Thirumalai Rengachari ,  Siddharth Maru ,  Ramin Zanbaghi ,  Firas Azrai ,  Rahul Singh

IPC: H05B33/08 ,  H02M3/156

CPC classification number: H05B33/0815 ,  H02M3/156 ,  H05B33/0845 ,  H05B37/02

Abstract: A turn-off transition time period, also referred to as a reverse recovery time period, may be compensated for by a controller of a power stage including a bipolar junction transistor (BJT). The reverse recovery time period may be measured in one switching cycle and a subsequent switching cycle may include compensations based on the measured reverse recovery time period. That is the switching on and off of the BJT may be compensated to obtain a desired average output current to a load. When the reverse recovery time period is known, an error in the peak current obtained due to the reverse recovery time period may be calculated. The calculated error may be used to offset the target peak current for controlling the switching of the BJT to begin a turn-off transition of the BJT earlier in a switching cycle and thus reduce error in peak current at the BJT.

Abstract translation: 还可以通过包括双极结型晶体管（BJT）的功率级的控制器补偿关断转换时间段（也称为反向恢复时间周期）。 可以在一个开关周期内测量反向恢复时间段，并且随后的开关周期可以包括基于所测量的反向恢复时间段的补偿。 也就是说，可以补偿BJT的接通和断开以获得期望的负载平均输出电流。 当已知反向恢复时间周期时，可以计算由于反向恢复时间段而获得的峰值电流的误差。 计算出的误差可用于偏移目标峰值电流，以控制BJT的开关，以便在开关周期中较早地开始BJT的关断转换，从而减小BJT的峰值电流误差。

公开(公告)号：US20140301572A1

公开(公告)日：2014-10-09

申请号：US14247771

申请日：2014-04-08

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  John C. Tucker

IPC: H04R3/00

CPC classification number: H04R3/02 ,  H03F1/26 ,  H03F3/16 ,  H03F2200/372 ,  H03M3/00 ,  H03M3/39 ,  H03M3/424 ,  H03M3/458 ,  H03M3/50 ,  H03M7/3026 ,  H03M7/3028 ,  H04R3/00 ,  H04R3/002 ,  H04R3/007 ,  H04R19/04 ,  H04R29/001

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.

Abstract translation: 根据本公开的实施例，数字麦克风系统可以包括麦克风换能器和数字处理系统。 麦克风换能器可以被配置为产生指示入射到麦克风换能器上的音频声音的模拟输入信号。 数字处理系统可以被配置为将模拟输入信号转换成具有多个（例如，多于3个）量化级的第一数字信号，并且在数字域中处理第一数字信号以将第一数字信号压缩成 具有比第一数字信号的量化级别（例如，+1,0，-1）更少的第二数字信号。

公开(公告)号：US20140265916A1

公开(公告)日：2014-09-18

申请号：US14212376

申请日：2014-03-14

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Prashanth Drakshapalli ,  Siddharth Maru ,  Rahul Singh

IPC: H05B33/08

CPC classification number: H05B33/0809 ,  H05B33/0815 ,  H05B33/0848 ,  Y02B20/346 ,  Y02B20/383

Abstract: An electronic system and method include a controller to actively control transfer of excess energy to an auxiliary-winding of an auxiliary power dissipation circuit. The excess energy is a transfer of energy from a primary winding of a switching power converter to the auxiliary-winding of the auxiliary power dissipation circuit. In at least one embodiment, the electronic system is a lighting system that includes a triac-based dimmer. The excess energy is energy drawn through the primary-side winding of the switching power converter to provide operational compatibility between a dimmer through which a power supply provides energy to the switching power converter and a load to which the switching power converter provides energy.

Abstract translation: 电子系统和方法包括控制器，用于主动地控制向辅助功率耗散电路的辅助绕组传递过剩能量。 过量的能量是能量从开关功率转换器的初级绕组传递到辅助功率耗散电路的辅助绕组。 在至少一个实施例中，电子系统是包括基于三端双向可控硅的调光器的照明系统。 过量的能量是通过开关功率转换器的初级侧绕组抽取的能量，以提供调光器之间的操作兼容性，通过该调光器，电源向开关功率转换器提供能量和开关功率转换器提供能量的负载。

公开(公告)号：US20140167639A1

公开(公告)日：2014-06-19

申请号：US13903591

申请日：2013-05-28

Applicant: Cirrus Logic, Inc.

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

IPC: F21V23/02

CPC classification number: F21V23/02 ,  H05B33/0815

Abstract: Methods and systems to provide compatibility between a load and a secondary winding of an electronic transformer driven by a leading-edge dimmer may include: (a) responsive to determining that energy is available from the electronic transformer, drawing a requested amount of power from the electronic transformer thus transferring energy from the electronic transformer to an energy storage device in accordance with the requested amount of power; and (b) transferring energy from the energy storage device to the load at a rate such that a voltage of the energy storage device is regulated within a predetermined voltage range.

Abstract translation: 提供由前缘调光器驱动的电子变压器的负载和次级绕组之间的兼容性的方法和系统可以包括：（a）响应于确定来自电子变压器的能量可用，从 电子变压器，因此根据所要求的功率量将能量从电子变压器传输到能量存储装置; 和（b）以能够将能量存储装置的电压调节到规定的电压范围内的速度将能量从能量存储装置传递给负载。

公开(公告)号：US20140042926A1

公开(公告)日：2014-02-13

申请号：US14057982

申请日：2013-10-18

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson

IPC: H05B33/08

CPC classification number: H05B33/0815 ,  H05B33/0818 ,  Y02B20/347 ,  Y10S315/04

Abstract: A light emitting diode (LED) lighting system includes a PFC and output voltage controller and a LED lighting power system. The controller advantageously operates from an auxiliary voltage less than a link voltage generated by the LED lighting power system. The common reference voltage allows all the components of lighting system to work together. A power factor correction switch and an LED drive current switch are coupled to the common reference node and have control node-to-common node, absolute voltage that allows the controller to control the conductivity of the switches. The LED lighting system can utilize feed forward control to concurrently modify power demand by the LED lighting power system and power demand of one or more LEDs. The LED lighting system can utilize a common current sense device to provide a common feedback signal to the controller representing current in at least two of the LEDs.

Abstract translation: 发光二极管（LED）照明系统包括PFC和输出电压控制器以及LED照明电源系统。 控制器有利地从小于由LED照明电力系统产生的链路电压的辅助电压进行操作。 公共参考电压允许照明系统的所有组件一起工作。 功率因数校正开关和LED驱动电流开关耦合到公共参考节点并具有控制节点到公共节点，允许控制器控制开关的电导率的绝对电压。 LED照明系统可以利用前馈控制来同时修改LED照明电源系统的功率需求和一个或多个LED的功率需求。 LED照明系统可以利用公共电流检测装置向控制器提供公共反馈信号，该控制器表示至少两个LED中的电流。

公开(公告)号：US20140009079A1

公开(公告)日：2014-01-09

申请号：US13799010

申请日：2013-03-13

Applicant: CIRRUS LOGIC, INC.

Inventor： Yanhui Xie ,  Eric Jerome King ,  John L. Melanson

IPC: H05B37/02

CPC classification number: H05B37/02 ,  H05B33/0803 ,  H05B33/0809 ,  H05B33/0815 ,  H05B33/0845 ,  Y02B20/383

Abstract: A system and method for providing compatibility between a load and a secondary winding of a magnetic transformer driven at its primary winding by a trailing-edge dimmer may include determining from a magnetic transformer secondary signal a period of a half-line cycle of an output signal of the dimmer, determining from the magnetic transformer secondary signal an estimated occurrence of an end of a phase-cut angle of the dimmer, and generating a driving signal to the load based on the period and the estimated occurrence of the end of the phase-cut angle. A lamp assembly may include a lamp for generating light and a controller for controlling operation of the lamp, the controller comprising a timing control circuit for determining a period of a periodic signal received by the lamp assembly.

Abstract translation: 用于提供在其初级绕组上由后缘调光器驱动的磁变压器的负载和次级绕组之间的兼容性的系统和方法可以包括从磁变压器辅助信号确定输出信号的半行周期的周期 从所述磁性变压器二次信号中确定所述调光器的相位角的结束的估计出现，并且基于所述相位切换角度的所述周期的周期和所述估计出现，向所述负载产生驱动信号， 切角。 灯组件可以包括用于产生光的灯和用于控制灯的操作的控制器，所述控制器包括用于确定由灯组件接收的周期性信号的周期的定时控制电路。

公开(公告)号：US20130342141A1

公开(公告)日：2013-12-26

申请号：US13826898

申请日：2013-03-14

Applicant: Cirrus Logic, Inc.

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

IPC: H02P6/18

CPC classification number: H02P6/183 ,  H02P6/185

Abstract: A system is disclosed for controlling motor switching in a sensorless BLDC motor having a set of three stator windings. A controller unit includes a control signal generator, a memory device, a processing unit, a signal acquisition device, and an analog-to-digital converter. A power stage having a plurality of switches receives a control signal from the control signal generator and a power signal from a power source. The power stage drives two windings of the set of three stator windings with an asymmetric 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 also communicates with the power stage to change which two windings of the three stator windings are driven when the demodulated measured voltage surpasses a threshold.

Abstract translation: 公开了一种用于控制具有一组三个定子绕组的无传感器BLDC电动机中的电动机开关的系统。 控制器单元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。 具有多个开关的功率级从控制信号发生器接收控制信号和来自电源的功率信号。 功率级通过不对称的脉宽调制信号驱动三组定子绕组的两个绕组，并使三个定子绕组中的一个定子不分流。 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，处理单元还与功率级进行通信，以改变三个定子绕组的两个绕组的驱动。

公开(公告)号：US20130342130A1

公开(公告)日：2013-12-26

申请号：US14010087

申请日：2013-08-26

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  John J. Paulos

IPC: H05B37/02

CPC classification number: H05B37/0209 ,  H05B33/0809 ,  H05B33/0848 ,  H05B37/02

Abstract: A system and method map dimming levels of a lighting dimmer to light source control signals using a predetermined lighting output function. The dimmer generates a dimmer output signal value. At any particular period of time, the dimmer output signal value represents one of multiple dimming levels. In at least one embodiment, the lighting output function maps the dimmer output signal value to a dimming value different than the dimming level represented by the dimmer output signal value. The lighting output function converts a dimmer output signal values corresponding to measured light levels to perception based light levels. A light source driver operates a light source in accordance with the predetermined lighting output function. The system and method can include a filter to modify at least a set of the dimmer output signal values prior to mapping the dimmer output signal values to a new dimming level.

Abstract translation: 系统和方法使用预定的照明输出功能将照明调光器的调光水平映射到光源控制信号。 调光器产生调光输出信号值。 在任何特定时间段，调光器输出信号值表示多个调光电平之一。 在至少一个实施例中，照明输出功能将调光器输出信号值映射到与由调光器输出信号值表示的调光电平不同的调光值。 照明输出功能将对应于测量光级的调光输出信号值转换为基于感知的光级。 光源驱动器根据预定的照明输出功能操作光源。 该系统和方法可以包括滤波器，以在将调光器输出信号值映射到新的调光电平之前修改至少一组调光输出信号值。