公开(公告)号：US20150223299A1

公开(公告)日：2015-08-06

申请号：US14171472

申请日：2014-02-03

Applicant: QUALCOMM Incorporated

Inventor： Troy Stockstad ,  Bing Liu ,  Joseph D. Rutkowski

IPC: H05B33/08

CPC classification number: H05B33/0815 ,  H05B33/0845

Abstract: In one embodiment, a circuit comprises a current source to produce current to a light emitting diode array. An analog dimming circuit generates a continuous control signal to the current source to control the current in the light emitting diode array according to a range of control signal values when the control signal is above a threshold. Below the threshold, a digital modulation circuit generates an additional modulated digital signal to the current source to control the current in the light emitting diode array according to a range of modulation values when the continuous control signal is below the threshold. The continuous control signal produces current from the current source into the light emitting diode array above a first value. The combination of the continuous control signal and the modulated digital signal produces current in the light emitting diode array below the first value.

Abstract translation: 在一个实施例中，电路包括用于产生电流至发光二极管阵列的电流源。 当控制信号高于阈值时，模拟调光电路产生到电流源的连续控制信号以根据控制信号值的范围来控制发光二极管阵列中的电流。 低于阈值时，数字调制电路产生附加的调制数字信号到电流源，以在连续控制信号低于阈值时根据调制值的范围来控制发光二极管阵列中的电流。 连续控制信号从电流源产生高于第一值的电流至发光二极管阵列。 连续控制信号和调制数字信号的组合在发光二极管阵列中产生低于第一值的电流。

公开(公告)号：US09537450B2

公开(公告)日：2017-01-03

申请号：US14488114

申请日：2014-09-16

Applicant: QUALCOMM Incorporated

Inventor： Lennart Karl-Axel Mathe ,  Pengfei Li ,  Song S. Shi ,  Yunfei Shi ,  Joseph D. Rutkowski

IPC: H03F1/02 ,  H03F3/21 ,  H03F3/19 ,  H03F3/24

CPC classification number: H03F1/0222 ,  H03F1/0227 ,  H03F3/19 ,  H03F3/21 ,  H03F3/245 ,  H03F2200/102 ,  H03F2200/451

Abstract: Techniques for dynamically generating a headroom voltage for an envelope tracking system. In an aspect, an initial headroom voltage is updated when a signal from a power amplifier (PA) indicates that the PA headroom is insufficient. The initial headroom voltage may be updated to an operating headroom voltage that includes the initial voltage plus a deficiency voltage plus a margin. In this manner, the operating headroom voltage may be dynamically selected to minimize power consumption while still ensuring that the PA is linear. In a further aspect, a specific exemplary embodiment of a headroom voltage generator using a counter is described.

Abstract translation: 用于动态产生包络跟踪系统的净空电压的技术。 在一方面，当来自功率放大器（PA）的信号指示PA余量不足时，更新初始余量电压。 初始余量电压可以被更新为包括初始电压加上缺陷电压加上余量的操作净空电压。 以这种方式，可以动态选择操作净空电压以最小化功耗，同时仍然确保PA是线性的。 在另一方面，描述了使用计数器的净空电压发生器的具体示例性实施例。

公开(公告)号：US09271351B2

公开(公告)日：2016-02-23

申请号：US14171472

申请日：2014-02-03

Applicant: QUALCOMM Incorporated

Inventor： Troy Stockstad ,  Bing Liu ,  Joseph D. Rutkowski

IPC: H05B37/02 ,  H05B33/08

CPC classification number: H05B33/0815 ,  H05B33/0845

Abstract: In one embodiment, a circuit comprises a current source to produce current to a light emitting diode array. An analog dimming circuit generates a continuous control signal to the current source to control the current in the light emitting diode array according to a range of control signal values when the control signal is above a threshold. Below the threshold, a digital modulation circuit generates an additional modulated digital signal to the current source to control the current in the light emitting diode array according to a range of modulation values when the continuous control signal is below the threshold. The continuous control signal produces current from the current source into the light emitting diode array above a first value. The combination of the continuous control signal and the modulated digital signal produces current in the light emitting diode array below the first value.

Abstract translation: 在一个实施例中，电路包括用于产生电流至发光二极管阵列的电流源。 当控制信号高于阈值时，模拟调光电路产生到电流源的连续控制信号以根据控制信号值的范围来控制发光二极管阵列中的电流。 低于阈值时，数字调制电路产生附加的调制数字信号到电流源，以在连续控制信号低于阈值时根据调制值的范围来控制发光二极管阵列中的电流。 连续控制信号从电流源产生高于第一值的电流至发光二极管阵列。 连续控制信号和调制数字信号的组合在发光二极管阵列中产生低于第一值的电流。

公开(公告)号：US20140210550A1

公开(公告)日：2014-07-31

申请号：US13752241

申请日：2013-01-28

Applicant: QUALCOMM INCORPORATED

Inventor： Lennart Karl-Axel Mathe ,  Joseph D. Rutkowski ,  Song S. Shi

IPC: H03G1/00

CPC classification number: H03G1/0005 ,  H03F1/0238

Abstract: Techniques for preventing reverse current in applications wherein a tracking supply voltage is placed in parallel with a switching power stage. The tracking supply voltage may be boosted to a level higher than a battery supply voltage using, e.g., a boost converter. In an aspect, a negative current detection block is provided to detect negative current flow from the boosted tracking supply voltage to the battery supply voltage. A high-side switch of the switching power stage may be disabled in response to detecting the negative current. To prevent false tripping, the tracking supply voltage may be further compared with the battery supply voltage, and a latch may be provided to further control the high-side switch.

Abstract translation: 在跟踪电源电压与开关功率级并联放置的应用中用于防止反向电流的技术。 使用例如升压转换器，跟踪电源电压可以升高到高于电​​池电源电压的电平。 在一方面，提供负电流检测块以检测从升压的跟踪电源电压到电池电源电压的负电流。 可以响应于检测到负电流而禁用开关功率级的高侧开关。 为了防止错误跳闸，可以将跟踪电源电压进一步与电池电源电压进行比较，并且可以提供锁存器以进一步控制高侧开关。

公开(公告)号：US20150162836A1

公开(公告)日：2015-06-11

申请号：US14625068

申请日：2015-02-18

Applicant: QUALCOMM Incorporated

Inventor： Joseph D. Rutkowski

IPC: H02M3/158

CPC classification number: H02M3/158 ,  G05F3/02 ,  H02J1/00 ,  H02M1/088 ,  H02M3/1588 ,  H02M2001/0032 ,  H02M2001/0054 ,  H03K17/122 ,  Y02B70/1466 ,  Y02B70/1491

Abstract: Techniques for optimizing the trade-off between minimizing switching losses and minimizing conduction losses in a buck converter. In an aspect, each of a high-side switch and a low-side switch may be implemented as a plurality of parallel-coupled transistors, each transistor having an independently controllable gate voltage, allowing adjustment of the effective transistor size. In response to the target voltage of the buck converter corresponding to a relatively high voltage range, more high-side switch transistors and fewer low-side switch transistors may be selected. Similarly, in response to the target voltage corresponding to a relatively low voltage range, more low-side switch transistors and fewer high-side switch transistors may be selected. In an aspect, the techniques may be applied during a pulse-frequency modulation mode.

Abstract translation: 用于优化在降低转换器中最小化开关损耗和最小化传导损耗之间权衡的技术。 一方面，高侧开关和低侧开关中的每一个可以被实现为多个并联耦合晶体管，每个晶体管具有独立可控的栅极电压，从而允许有效晶体管尺寸的调节。 响应于对应于较高电压范围的降压转换器的目标电压，可以选择更多的高侧开关晶体管和较少的低侧开关晶体管。 类似地，响应于对应于相对低电压范围的目标电压，可以选择更多的低侧开关晶体管和较少的高侧开关晶体管。 在一个方面，可以在脉冲 - 频率调制模式期间应用这些技术。

公开(公告)号：US20140210559A1

公开(公告)日：2014-07-31

申请号：US13752287

申请日：2013-01-28

Applicant: QUALCOMM INCORPORATED

Inventor： Lennart Karl-Axel Mathe ,  Pengfei Li ,  Song S. Shi ,  Yunfei Shi ,  Joseph D. Rutkowski

IPC: H03G1/00

CPC classification number: H03F1/0222 ,  H03F1/0227 ,  H03F3/19 ,  H03F3/21 ,  H03F3/245 ,  H03F2200/102 ,  H03F2200/451

Abstract: Techniques for dynamically generating a headroom voltage for an envelope tracking system. In an aspect, an initial headroom voltage is updated when a signal from a power amplifier (PA) indicates that the PA headroom is insufficient. The initial headroom voltage may be updated to an operating headroom voltage that includes the initial voltage plus a deficiency voltage plus a margin. In this manner, the operating headroom voltage may be dynamically selected to minimize power consumption while still ensuring that the PA is linear. In a further aspect, a specific exemplary embodiment of a headroom voltage generator using a counter is described.

Abstract translation: 用于动态产生包络跟踪系统的净空电压的技术。 在一方面，当来自功率放大器（PA）的信号指示PA余量不足时，更新初始余量电压。 初始余量电压可以被更新为包括初始电压加上缺陷电压加上余量的操作净空电压。 以这种方式，可以动态选择操作净空电压以最小化功耗，同时仍然确保PA是线性的。 在另一方面，描述了使用计数器的净空电压发生器的具体示例性实施例。