公开(公告)号：US08395331B2

公开(公告)日：2013-03-12

申请号：US12898547

申请日：2010-10-05

申请人： Karl Richard Volk ,  Thomas Joseph Karpus ,  David Paul Keesor ,  Russell Coleman Deans ,  Paul Edward Hinson

发明人： Karl Richard Volk ,  Thomas Joseph Karpus ,  David Paul Keesor ,  Russell Coleman Deans ,  Paul Edward Hinson

IPC分类号： H05B37/02

CPC分类号： H05B33/089 ,  H05B33/0824

摘要： A system and method is provided for preventing a dropout of an LED current. In one embodiment of the present invention, the system includes a voltage source, a first circuit, a second circuit, a controller, and at least one LED. The first circuit receives a reference voltage from the voltage source, receives set-point current data from the controller, and uses the reference voltage and the set-point current data to produce a threshold voltage. The threshold voltage is then provided to the second circuit, where it is converted into an output current, which is drawn through the LED. The second circuit then compares the threshold voltage to an output voltage corresponding to the output current, and provides an output to the controller. The controller then uses the output to determine whether a dropout has occurred. If a dropout has occurred, then second set-point current data is provided to the first circuit.

摘要翻译： 提供了一种用于防止LED电流的脱落的系统和方法。 在本发明的一个实施例中，系统包括电压源，第一电路，第二电路，控制器和至少一个LED。 第一电路从电压源接收参考电压，从控制器接收设定点电流数据，并使用参考电压和设定点电流数据产生阈值电压。 然后将阈值电压提供给第二电路，其中它被转换成通过LED绘制的输出电流。 然后，第二电路将阈值电压与对应于输出电流的输出电压进行比较，并向控制器提供输出。 然后，控制器使用输出来确定是否发生了丢失。 如果发生了压差，则将第二设定点电流数据提供给第一电路。

公开(公告)号：US20120081036A1

公开(公告)日：2012-04-05

申请号：US12898547

申请日：2010-10-05

申请人： Karl Richard Volk ,  Thomas Joseph Karpus ,  David Paul Keesor ,  Russell Coleman Deans ,  Paul Edward Hinson

发明人： Karl Richard Volk ,  Thomas Joseph Karpus ,  David Paul Keesor ,  Russell Coleman Deans ,  Paul Edward Hinson

IPC分类号： H05B41/36

CPC分类号： H05B33/089 ,  H05B33/0824

摘要： A system and method is provided for preventing a dropout of an LED current. In one embodiment of the present invention, the system includes a voltage source, a first circuit, a second circuit, a controller, and at least one LED. The first circuit receives a reference voltage from the voltage source, receives set-point current data from the controller, and uses the reference voltage and the set-point current data to produce a threshold voltage. The threshold voltage is then provided to the second circuit, where it is converted into an output current, which is drawn through the LED. The second circuit then compares the threshold voltage to an output voltage corresponding to the output current, and provides an output to the controller. The controller then uses the output to determine whether a dropout has occurred. If a dropout has occurred, then second set-point current data is provided to the first circuit.

摘要翻译： 提供了一种用于防止LED电流的脱落的系统和方法。 在本发明的一个实施例中，系统包括电压源，第一电路，第二电路，控制器和至少一个LED。 第一电路从电压源接收参考电压，从控制器接收设定点电流数据，并使用参考电压和设定点电流数据产生阈值电压。 然后将阈值电压提供给第二电路，其中它被转换成通过LED绘制的输出电流。 然后，第二电路将阈值电压与对应于输出电流的输出电压进行比较，并向控制器提供输出。 然后，控制器使用输出来确定是否发生了丢失。 如果发生了压差，则将第二设定点电流数据提供给第一电路。

公开(公告)号：US07298119B1

公开(公告)日：2007-11-20

申请号：US11145269

申请日：2005-06-03

申请人： Jeffrey Lewis Amram Summit ,  Brett A. Miwa ,  Karl Richard Volk

发明人： Jeffrey Lewis Amram Summit ,  Brett A. Miwa ,  Karl Richard Volk

IPC分类号： G05F3/16

CPC分类号： H02M3/1582

摘要： A step-up/step-down switching regulator control method for a regulator having an inductor with first and second leads, a first switch for controllably coupling the first lead to a source of power, a first device between the first lead and a circuit ground, a second switch for controllably coupling the second lead to the circuit ground, and a second device between the second lead and a regulator, the method comprising operating the switches in a sequence of phases when the source of power has a voltage exceeding the regulator output and in the same sequence of phases when the source of power has a voltage less than the regulator output, the phases being phase 1 with the first and second switches closed, phase 2 with the first switch closed and the second switch open, and phase 3 with both switches open. The first and second devices may be switches or diodes. Various embodiments are disclosed.

摘要翻译： 一种用于具有具有第一和第二引线的电感器的调节器的升压/降压开关调节器控制方法，用于可控地将第一引线耦合到电源的第一开关，在第一引线和电路接地之间的第一器件 ，用于可控地将所述第二引线耦合到所述电路接地的第二开关，以及在所述第二引线和调节器之间的第二器件，所述方法包括当所述电源具有超过所述调节器输出的电压时以相序为单位操作所述开关 并且当功率源具有小于调节器输出的电压时，在相位序列中，相位是相位1，第一和第二开关闭合，相位2与第一开关闭合，第二开关断开，相3 两个开关打开。 第一和第二装置可以是开关或二极管。 公开了各种实施例。

公开(公告)号：US06538394B2

公开(公告)日：2003-03-25

申请号：US09822620

申请日：2001-03-30

申请人： Karl Richard Volk ,  Andrew J. Mrizek ,  Gary Hurtz

发明人： Karl Richard Volk ,  Andrew J. Mrizek ,  Gary Hurtz

IPC分类号： G05F100

CPC分类号： H05B33/0827 ,  G05F1/577 ,  G05F3/262 ,  H05B33/0887 ,  Y10S362/80

摘要： Current source methods and apparatus for light emitting diodes providing constant diode current and illumination in the presence of voltage and process variations. The method comprises providing a predetermined current through a first transistor, and mirroring the current through the first transistor to at least one additional transistor while holding the voltage across the first transistor to a predetermined value, wherein each additional transistor is coupled in series with a light emitting diode. An exemplary circuit, as well as various illustrative applications are disclosed.

公开(公告)号：US6087816A

公开(公告)日：2000-07-11

申请号：US342323

申请日：1999-06-29

申请人： Karl Richard Volk

发明人： Karl Richard Volk

IPC分类号： H02M3/158 ,  G05F1/56 ,  G05F1/10

CPC分类号： H02M3/1582

摘要： Step-up/step-down switching regulators and pulse width modulation control therefor which can provide a high output current, high efficiency, use physically smaller inductor and transistors, have lower output voltage ripple, excellent line and load regulation stability and very fast transient response. The modulation control includes three operating states. The improved operating characteristics are obtained by including, as one of the operating states, the direct flow of current from the input of the regulator to the output of the regulator. This allows delivery of current from the inductor to the output a greater percentage of the time than in the prior art. An exemplary embodiment and exemplary method of operation are described.

摘要翻译： 升压/降压开关稳压器和脉宽调制控制可提供高输出电流，高效率，使用物理较小的电感和晶体管，具有较低的输出电压纹波，优异的线路和负载调节稳定性以及非常快的瞬态响应 。 调制控制包括三个操作状态。 通过将来自调节器的输入的电流直接流向调节器的输出，作为其中一个操作状态来获得改进的操作特性。 这允许从电感器向输出传递电流比现有技术更大的时间百分比。 描述了示例性实施例和示例性操作方法。