公开(公告)号：US20160080862A1

公开(公告)日：2016-03-17

申请号：US14483659

申请日：2014-09-11

Applicant: Cirrus Logic, Inc.

Inventor： Ku He ,  Tejasvi Das ,  John L. Melanson

IPC: H04R3/00 ,  H03G3/20

CPC classification number: H04R3/00 ,  H03G3/00 ,  H03G3/20 ,  H03G3/3005 ,  H03G3/3089 ,  H04R3/04 ,  H04R2430/00

Abstract: In accordance with embodiments of the present disclosure, a control circuit may be configured to, responsive to an indication to switch between gain modes of a signal path having an analog path portion and a digital signal path portion, switch a selectable analog gain of the analog path portion between a first analog gain and a second analog gain, switch a selectable digital gain of the digital signal path portion between a first digital gain and a second digital gain, wherein the product of the first analog gain and the first digital gain is approximately equal to the product of the second analog gain and the second digital gain, and control an analog response of the signal path to reduce the occurrence of audio artifacts present in the output signal as a result of the switch between gain modes of the signal path.A signal path may have an analog path portion and a digital signal path portion. The digital portion may have a selectable digitally-controlled gain and may be configured to convert a digital audio input signal into an analog input signal in conformity with the selectable digitally-controlled gain, the digital signal path portion comprising a modulator including a forward path and a feedback path. The forward path may include a loop filter for generating a filtered signal responsive to the digital audio input signal and a feedback signal, a quantizer responsive to the filtered signal for generating a quantized signal, and a first gain element configured to apply the selectable digitally-controlled gain to a signal within the forward path. The feedback path may be configured to generate the feedback signal responsive to the quantized signal, the feedback path including a second gain element having a gain inversely proportional to the selectable digitally-controlled gain.

公开(公告)号：US20160056808A9

公开(公告)日：2016-02-25

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.

公开(公告)号：US20150381130A1

公开(公告)日：2015-12-31

申请号：US14467969

申请日：2014-08-25

Applicant: Cirrus Logic, Inc.

Inventor： Tejasvi Das ,  Ku He ,  John L. Melanson

IPC: H03G3/20 ,  H04R3/02

CPC classification number: H04R3/02 ,  H03G3/001 ,  H03G3/002 ,  H03G3/3005 ,  H03G3/3026 ,  H03M1/70 ,  H04R2430/01

Abstract: In accordance with embodiments of the present disclosure, an apparatus for providing an output signal to an audio transducer may include a control circuit. The control circuit may be configured to predict, based on a magnitude of a signal indicative of the output signal, an occurrence of an event for changing a selectable digital gain and a selectable analog gain and an audio signal path, and responsive to predicting the occurrence of the event, change, at an approximate time in which a zero crossing of the signal indicative of the output signal occurs, the selectable digital gain and the selectable analog gain.

Abstract translation: 根据本公开的实施例，用于向音频换能器提供输出信号的装置可以包括控制电路。 控制电路可以被配置为基于指示输出信号的信号的大小来预测用于改变可选数字增益和可选择的模拟增益和音频信号路径的事件的发生，并且响应于预测发生 在发生指示输出信号的信号的零交叉的近似时间，可选择的数字增益和可选择的模拟增益之​​间改变事件。

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：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.

公开(公告)号：US20150162838A1

公开(公告)日：2015-06-11

申请号：US14102809

申请日：2013-12-11

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Eric J. King

IPC: H02M3/335

CPC classification number: H02M7/06 ,  H02M1/36 ,  H02M3/33507 ,  H02M2001/0006 ,  H05B33/0815 ,  Y02B20/346 ,  Y10T307/352 ,  Y10T307/50

Abstract: A system and method includes a controller that is configured to coordinate (i) a low impedance path for a dimmer current, (ii), control of switch mode power conversion and (iii) an inactive state to, for example, to allow 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), and (iii), the controller controls a power converter system that is compatible with a triac-based dimmer. In at least one embodiment, the controller coordinates functions (i), (ii), and (iii) in response to a particular dimming level indicated by a phase cut, rectified input voltage supplied to the power converter system.

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）开关模式功率转换的控制和（iii）非活动状态，以例如允许调光器 在交流（AC）电源电压的周期到周期之间正常工作。 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）和（iii），控制器控制与基于triac的调光器兼容的功率转换器系统。 在至少一个实施例中，控制器响应由提供给功率转换器系统的相位切断的整流输入电压指示的特定调光电平来对功能（i），（ii）和（iii）进行协调。

公开(公告)号：US09000680B2

公开(公告)日：2015-04-07

申请号：US14010087

申请日：2013-08-26

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  John J. Paulos

IPC: H05B37/02 ,  H05B33/08

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。

公开(公告)号：US08963449B2

公开(公告)日：2015-02-24

申请号：US13917194

申请日：2013-06-13

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson

IPC: H05B37/02 ,  H05B33/08 ,  H03K17/18 ,  H03K17/567 ,  H03K17/687 ,  H03K17/74

CPC classification number: H05B33/0815 ,  H03K17/18 ,  H03K17/567 ,  H03K17/687 ,  H03K17/6872 ,  H03K17/74 ,  H05B33/0809 ,  H05B33/0818 ,  H05B33/0845 ,  H05B33/0848 ,  H05B33/0851 ,  H05B33/0887 ,  Y02B20/346 ,  Y02B20/347 ,  Y10S315/04 ,  Y10S323/905

Abstract: A light emitting diode (LED) lighting system includes a power factor correction (PFC) controller that determines at least one power factor correction control parameter from phase delays of a phase modulated signal. In at least one embodiment, a peak voltage of the phase modulated signal is a PFC control parameter used by the PFC controller to control power factor correction and generation of a link voltage by a PFC LED driver circuit. The phase delays. are related to a peak voltage of the phase modulated signal. Thus, in at least one embodiment, detecting the phase delay in one or more cycles of the phase modulated signal allows the PFC controller to determine the peak voltage of the phase modulated signal.

Abstract translation: 发光二极管（LED）照明系统包括功率因数校正（PFC）控制器，其从相位调制信号的相位延迟确定至少一个功率因数校正控制参数。 在至少一个实施例中，相位调制信号的峰值电压是由PFC控制器使用的PFC控制参数，以通过PFC LED驱动器电路来控制功率因数校正和产生链路电压。 相位延迟。 与相位调制信号的峰值电压有关。 因此，在至少一个实施例中，在相位调制信号的一个或多个周期中检测相位延迟允许PFC控制器确定相位调制信号的峰值电压。

公开(公告)号：US08952625B2

公开(公告)日：2015-02-10

申请号：US14057982

申请日：2013-10-18

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson

IPC: H05B41/16

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：US20140252975A1

公开(公告)日：2014-09-11

申请号：US14203755

申请日：2014-03-11

Applicant: Cirrus Logic, Inc.

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

IPC: H02M3/335 ,  H05B33/08

CPC classification number: H02M3/33507 ,  H05B33/0815 ,  Y02B20/347

Abstract: A power distribution system and method includes a controller that is configured to control a switching power converter. In at least one embodiment, the controller includes a compensation current control circuit to control a compensation current that reduces and, in at least one embodiment, approximately eliminates variations in current drawn by the controller during a particular operational time period. In at least one embodiment, the power distribution system is a lamp that includes the controller, a switching power converter, and one or more light sources, such as light emitting diodes.

Abstract translation: 配电系统和方法包括配置成控制开关功率转换器的控制器。 在至少一个实施例中，控制器包括补偿电流控制电路，用于控制减小的补偿电流，并且在至少一个实施例中，大致消除了在特定操作时间段期间控制器所绘制的电流的变化。 在至少一个实施例中，配电系统是包括控制器，开关功率转换器和一个或多个光源（诸如发光二极管）的灯。