公开(公告)号：US20160255685A1

公开(公告)日：2016-09-01

申请号：US14634716

申请日：2015-02-27

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Ramin Zanbaghi ,  Thirumalai Rengachari ,  Prashanth Drakshapalli ,  Rahul Singh ,  Arnab Kumar Dutta

IPC: H05B33/08

CPC classification number: H05B33/0815 ,  H02M3/335 ,  H05B33/0845 ,  H05B33/0887 ,  H05B37/02

Abstract: A bipolar junction transistor (BJT) may be used in a power stage DC-to-DC converter, such as a converter in LED-based light bulbs. The power stage may be operated by a controller to maintain a desired current output to the LED load. The controller may operate the power stage by monitoring a start and end of a reverse recovery time of the BJT. Information regarding the start and end of the reverse recovery time may be used in the control of the power stage to improve efficiency of the power stage.

Abstract translation: 双极结型晶体管（BJT）可用于功率级DC-DC转换器，例如基于LED的灯泡中的转换器。 功率级可以由控制器操作以保持对LED负载的期望的电流输出。 控制器可以通过监视BJT的反向恢复时间的开始和结束来操作功率级。 关于反向恢复时间的开始和结束的信息可以用于功率级的控制，以提高功率级的效率。

公开(公告)号：US09214862B2

公开(公告)日：2015-12-15

申请号：US14495564

申请日：2014-09-24

Applicant: Cirrus Logic, Inc.

Inventor： Poornima Mazumdar ,  Mohit Sood ,  Rahul Singh ,  Sahil Singh

IPC: H02M3/156 ,  H02M1/00

CPC classification number: H02M3/156 ,  H02M3/33507 ,  H02M2001/0054 ,  H02M2001/0058 ,  Y02B70/1491

Abstract: A controller may be configured to generate a control signal to activate and deactivate a switch of a switching power converter in order to control a switching period and a peak current of the switching power converter to maintain a regulated current of the switching power converter at a desired current level such that: if the switching period decreases below a minimum switching period, the controller increases the switching period by a ringing period of a voltage of the switch and increases the peak current to compensate for the increase of the switching period in order to maintain the regulated current, and if the peak current increases above a maximum peak current, the controller decreases the switching period by a ringing period of the voltage of the switch and decreases the peak current to compensate for the decrease of the switching period in order to maintain the regulated current.

Abstract translation: 控制器可以被配置为产生控制信号以激活和停用开关功率转换器的开关，以便控制开关功率转换器的开关周期和峰值电流，以将开关功率转换器的调节电流保持在期望的 电流电平使得：如果开关周期降低到最小开关周期以下，则控制器将开关周期增加开关电压的振铃周期，并增加峰值电流以补偿开关周期的增加以便维持 调节电流，并且如果峰值电流增加到最大峰值电流以上，则控制器将开关周期减小开关的电压的振铃周期，并降低峰值电流以补偿开关周期的减小以便维持 调节电流。

公开(公告)号：US20150303796A1

公开(公告)日：2015-10-22

申请号：US14495564

申请日：2014-09-24

Applicant: Cirrus Logic, Inc.

Inventor： Poornima Mazumdar ,  Mohit Sood ,  Rahul Singh ,  Sahil Singh

IPC: H02M3/156

CPC classification number: H02M3/156 ,  H02M3/33507 ,  H02M2001/0054 ,  H02M2001/0058 ,  Y02B70/1491

Abstract: A controller may be configured to generate a control signal to activate and deactivate a switch of a switching power converter in order to control a switching period and a peak current of the switching power converter to maintain a regulated current of the switching power converter at a desired current level such that: if the switching period decreases below a minimum switching period, the controller increases the switching period by a ringing period of a voltage of the switch and increases the peak current to compensate for the increase of the switching period in order to maintain the regulated current, and if the peak current increases above a maximum peak current, the controller decreases the switching period by a ringing period of the voltage of the switch and decreases the peak current to compensate for the decrease of the switching period in order to maintain the regulated current.

Abstract translation: 控制器可以被配置为产生控制信号以激活和停用开关功率转换器的开关，以便控制开关功率转换器的开关周期和峰值电流，以将开关功率转换器的调节电流保持在期望的 电流电平使得：如果开关周期降低到最小开关周期以下，则控制器将开关周期增加开关电压的振铃周期，并增加峰值电流以补偿开关周期的增加以便维持 调节电流，并且如果峰值电流增加到最大峰值电流以上，则控制器将开关周期减小开关的电压的振铃周期，并降低峰值电流以补偿开关周期的减小以便维持 调节电流。

公开(公告)号：US20150271882A1

公开(公告)日：2015-09-24

申请号：US14220472

申请日：2014-03-20

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Eric King ,  Rahul Singh

IPC: H05B33/08

CPC classification number: H05B33/0815 ,  H05B33/0824 ,  H05B33/0827 ,  H05B33/083 ,  H05B33/0845 ,  H05B37/02 ,  H05B39/047 ,  H05B41/28 ,  H05B41/2827 ,  Y02B20/345 ,  Y02B20/346 ,  Y02B20/347

Abstract: An LED lighting device includes an auxiliary power supply that supplies power to a control circuit of the LED lighting device that receives an input from a terminal of a light-emitting diode (LED) string of the lighting device that has a substantially lower voltage than the line voltage to which the lighting device is connected. The terminal may be within the LED string, or may be an end of the string. A linear regulator may be operated from the voltage drop across a number of the LEDs in the string so that the energy wasted by the auxiliary power supply is minimized. In other designs, the auxiliary power supply may be intermittently connected in series with the LED string only when needed. The intermittent connection can be used to forward bias a portion of the LED string when the voltage supplied to the LED string is low, increasing overall brightness.

Abstract translation: LED照明装置包括辅助电源，其向LED照明装置的控制电路供电，所述控制电路接收来自所述照明装置的发光二极管（LED）串的端子的输入，所述发光二极管（LED） 照明装置所连接的线路电压。 终端可以在LED串内，或者可以是串的末端。 线性调节器可以从串中的多个LED上的电压降来操作，使得由辅助电源浪费的能量最小化。 在其他设计中，辅助电源可以仅在需要时与LED串串联连接。 当提供给LED串的电压低时，可以使用间歇连接来对LED串的一部分进行偏置，从而提高整体亮度。

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：US20140028213A1

公开(公告)日：2014-01-30

申请号：US13833587

申请日：2013-03-15

Applicant: CIRRUS LOGIC, INC.

Inventor： Mohit Sood ,  Spencer Isaacson ,  Rahul Singh ,  Zhaohui He

IPC: H03K17/14 ,  H05B33/08

CPC classification number: H02M3/33523 ,  H02M3/335 ,  H03K17/145 ,  H05B33/0815 ,  H05B33/0848 ,  H05B33/0884 ,  Y02B20/341 ,  Y10T307/406 ,  Y10T307/832

Abstract: A system and method include a controller that reduces power dissipated by a switch, such as a source-controlled field effect transistor, when an estimated amount of power dissipated by the switch exceeds a predetermined threshold. Reducing the power dissipated by the switch prevents damage to the switch due to overheating. The controller determines the estimated amount of power dissipated by the switch using actual drain-to-source current and drain voltage data. In at least one embodiment, the controller includes a fail-safe, estimated power dissipation determination path that activates when the drain voltage data fails a reliability test. Additionally, in at least one embodiment, the controller includes a model of thermal characteristics of the switch. In at least one embodiment, the controller utilizes real-time estimated power dissipation by the switch and the model to determine when the estimated power dissipated by the switch exceeds a power dissipation protection threshold.

Abstract translation: 一种系统和方法包括当由开关消耗的估计功率超过预定阈值时，降低由诸如源极控制场效应晶体管的开关消耗的功率的控制器。 降低开关消耗的功率可以防止由于过热而损坏开关。 控制器使用实际的漏极 - 源极电流和漏极电压数据确定开关耗散的功率的估计量。 在至少一个实施例中，控制器包括故障安全的估计功率耗散确定路径，当漏极电压数据失败可靠性测试时激活。 另外，在至少一个实施例中，控制器包括开关的热特性模型。 在至少一个实施例中，控制器利用开关和模型的实时估计的功率消耗来确定由开关消耗的估计功率何时超过功率耗散保护阈值。

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。

公开(公告)号：US09496855B2

公开(公告)日：2016-11-15

申请号：US14444087

申请日：2014-07-28

Applicant: Cirrus Logic, Inc.

Inventor： Siddharth Maru ,  John L. Melanson ,  Rahul Singh ,  Eric King ,  Thirumalai Rengachari ,  Ramin Zanbaghi ,  Arnab Kumar Dutta

IPC: H05B37/02 ,  H03K4/48 ,  H05B33/08

CPC classification number: H03K4/48 ,  H05B33/0815 ,  H05B37/02 ,  Y02B20/347

Abstract: A bipolar junction transistor (BJT) may be used in a power stage DC-to-DC converter, such as for LED-based light bulbs. The BJT may be switched on and off from a controller coupled to two terminals of the BJT. Through the two terminals, the control IC may dynamically adjust a reverse recovery time period of the BJT. The reverse recovery time period may be adjusted by changing an amount of base charge that accumulates on the BJT. Additional, the reverse recovery may be controlled through the use of a reverse base current source applied to the BJT after beginning switching off the BJT.

Abstract translation: 双极结型晶体管（BJT）可用于功率级DC-DC转换器，例如用于基于LED的灯泡。 BJT可以从耦合到BJT的两个端子的控制器接通和断开。 通过两个端子，控制IC可以动态地调整BJT的反向恢复时间段。 可以通过改变在BJT上积累的基本电荷的量来调整反向恢复时间段。 此外，可以通过在开始关闭BJT之后使用施加到BJT的反向基极电流源来控制反向恢复。

公开(公告)号：US09161401B1

公开(公告)日：2015-10-13

申请号：US14220472

申请日：2014-03-20

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Eric King ,  Rahul Singh

IPC: H05B33/08 ,  H05B41/28 ,  H05B41/282 ,  H05B39/04

CPC classification number: H05B33/0815 ,  H05B33/0824 ,  H05B33/0827 ,  H05B33/083 ,  H05B33/0845 ,  H05B37/02 ,  H05B39/047 ,  H05B41/28 ,  H05B41/2827 ,  Y02B20/345 ,  Y02B20/346 ,  Y02B20/347

Abstract: An LED lighting device includes an auxiliary power supply that supplies power to a control circuit of the LED lighting device that receives an input from a terminal of a light-emitting diode (LED) string of the lighting device that has a substantially lower voltage than the line voltage to which the lighting device is connected. The terminal may be within the LED string, or may be an end of the string. A linear regulator may be operated from the voltage drop across a number of the LEDs in the string so that the energy wasted by the auxiliary power supply is minimized. In other designs, the auxiliary power supply may be intermittently connected in series with the LED string only when needed. The intermittent connection can be used to forward bias a portion of the LED string when the voltage supplied to the LED string is low, increasing overall brightness.

Abstract translation: LED照明装置包括辅助电源，其向LED照明装置的控制电路供电，所述控制电路接收来自所述照明装置的发光二极管（LED）串的端子的输入，所述发光二极管（LED） 照明装置所连接的线路电压。 终端可以在LED串内，或者可以是串的末端。 线性调节器可以从串中的多个LED上的电压降来操作，使得由辅助电源浪费的能量最小化。 在其他设计中，辅助电源可以仅在需要时与LED串串联连接。 当提供给LED串的电压低时，可以使用间歇连接来对LED串的一部分进行偏置，从而提高整体亮度。

公开(公告)号：US20150171889A1

公开(公告)日：2015-06-18

申请号：US14636417

申请日：2015-03-03

Applicant: Cirrus Logic, Inc.

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

IPC: H03M3/00 ,  G01V1/18

CPC classification number: G01V1/181 ,  H03M3/424 ,  H03M3/45 ,  H03M3/454

Abstract: A low power analog-to-digital converter configured to sense sensor signals may include a loop filter and a feedback digital-to-analog converter. The loop filter may have a loop filter input configured to receive an input current signal from a sensor and generate an output signal responsive to the input current signal. The feedback digital-to-analog converter may have a feedback output configured to generate a current-mode or charge-mode feedback output signal responsive to the output signal, the feedback output coupled to the loop filter input in order to combine the input current signal and the feedback output signal at the input.

Abstract translation: 被配置为感测传感器信号的低功率模数转换器可以包括环路滤波器和反馈数模转换器。 环路滤波器可以具有环路滤波器输入，其被配置为从传感器接收输入电流信号，并响应于输入电流信号产生输出信号。 反馈数模转换器可以具有被配置为响应于输出信号产生电流模式或电荷模式反馈输出信号的反馈输出，反馈输出耦合到环路滤波器输入，以便组合输入电流信号 和输入端的反馈输出信号。