公开(公告)号：US09628033B2

公开(公告)日：2017-04-18

申请号：US14840894

申请日：2015-08-31

Applicant: Cirrus Logic, Inc.

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

IPC: H03F3/217 ,  H03F1/02 ,  H03F1/08 ,  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：US20160126908A1

公开(公告)日：2016-05-05

申请号：US14840894

申请日：2015-08-31

Applicant: Cirrus Logic, Inc.

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

IPC: H03F3/217

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.

Abstract translation: 用于向负载产生输出电压的方法可以包括在包括具有功率电感器的功率转换器的功率级中，布置成以多个开关配置顺序工作的多个开关，以及用于产生包括 第一输出端和第二输出端，控制线性放大器根据数字输入信号的一个或多个最低有效位将电能从功率级的输入源传输到负载，并根据 其中所述数字输入信号的位与所述一个或多个最低有效位不同，以顺序地施加来自所述多个开关配置的开关配置以选择性地激活或去激活所述多个开关中的每一个，以便从所述多个开关的输入源 功率级到负载。

公开(公告)号：US09277624B1

公开(公告)日：2016-03-01

申请号：US13889952

申请日：2013-05-08

Applicant: Cirrus Logic, Inc.

Inventor： Wesley L. Mokry ,  Michael A. Kost ,  Eric J. King

IPC: H05B37/00 ,  H05B37/02

CPC classification number: H05B37/02 ,  H02M1/36 ,  H02M7/217 ,  H02M2001/0045 ,  H05B33/0812 ,  Y02B20/343

Abstract: In accordance with embodiments of the present disclosure, a system and method for providing compatibility between a load having a reactive impedance during steady-state operation and a secondary winding of an electronic transformer driven by a leading-edge dimmer may include a first circuit and a second circuit. The first circuit may cause the load to have a substantially non-reactive impedance when the first circuit is enabled. The second circuit may enable the first circuit to cause the load to have the substantially non-reactive impedance during a duration of time following start-up of the electronic transformer and disable the first circuit after the duration such that the load has the reactive impedance during steady-state operation of the load.

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：US20150323947A1

公开(公告)日：2015-11-12

申请号：US14706680

申请日：2015-05-07

Applicant: Cirrus Logic, Inc.

Inventor： Christophe J. Amadi ,  Siddharth Maru ,  Eric J. King

IPC: G05F1/575

CPC classification number: H03F1/083 ,  G05F1/575 ,  H02M3/158 ,  H03F1/0277 ,  H03F3/181 ,  H03F3/217 ,  H03F3/2178 ,  H03F2200/03 ,  H03F2200/372

Abstract: In accordance with embodiments of the present disclosure, a system may include an impedance estimator configured to estimate an impedance of a load and generate a target current based at least on an input voltage and the impedance, a voltage feedback loop responsive to a difference between the input voltage and an output voltage of the load, and a current controller configured to, responsive to the voltage feedback loop, the impedance estimator, and the input voltage, generate an output current to the load.A controller may be configured to sequentially apply switch configurations to a power converter to selectively activate or deactivate each of a plurality of switches of the power converter in accordance with a selected operational mode of the power converter, wherein the plurality of operational modes may include a single-ended buck mode for switching a polarity of the output voltage in which: during a charging phase, at least one of the plurality of switches is activated such that a power inductor is coupled between a first terminal of a power source and a particular one of the first output terminal and the second output terminal; and during a transfer phase, at least one of the plurality of switches is activated such that the power inductor is coupled between a second terminal of the power source and the particular one of the first output terminal and the second output terminal.A controller may be configured to sequentially apply a plurality of switch configurations of a power converter in order to operate the power converter as a differential output converter to switch a polarity of the output voltage, such that: during a charging phase of the power converter, a power inductor is coupled between one of a first terminal and a second terminal of the power source and one of a first terminal 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 second terminal of the power source and one of the first terminal of the output load and the second terminal of the output load, wherein the output voltage comprises a differential voltage between the first terminal and the second terminal.A power converter may include a power inductor, a plurality of switches arranged to sequentially operate in a plurality of switch configurations, an output for producing the output voltage, wherein a first switch is coupled to a first output terminal of the output and a second switch is coupled to a second output terminal of the output, and a linear amplifier coupled to the output. The controller may be configured to, in a linear amplifier mode of the power stage, enable the linear amplifier to transfer electrical energy from an input source of the power stage to the load, and in at least one mode of the power stage other than the linear amplifier mode, 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 the electrical energy from the input source to the load.

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。