公开(公告)号：US20150364993A1

公开(公告)日：2015-12-17

申请号：US14303068

申请日：2014-06-12

Applicant: Cirrus Logic, Inc.

Inventor： Kan Wang ,  Michael A. Kost ,  Eric J. King ,  John L. Melanson ,  James P. McFarland

IPC: H02M3/156

CPC classification number: H02M3/156 ,  H05B33/0815 ,  Y02B20/346

Abstract: A low voltage lamp includes a boost converter stage and a load. The load may include low voltage light producing elements including low voltage light emitting diodes. The boost converter stage receives an electronic transformer output and includes an inductor coupled to a switch and a switch controller that receives one or more controller inputs. Inductor current may be returned to the transformer when the switch is closed and provided to a rectifier coupled to the load when the switch is open. Controller inputs may include a transformer input that receives the transformer output, a sense input indicating switch current, and a load input indicating load voltage. Controller logic may synchronize assertions of a control signal for the switch with edge transitions of the transformer output to maintain peak inductor current within a specified range and to selectively transfer stored energy in the inductor to the load or back to the transformer.

Abstract translation: 低压灯包括升压转换器级和负载。 负载可以包括低电压发光元件，包括低电压发光二极管。 升压转换器级接收电子变压器输出并且包括耦合到开关的电感器和接收一个或多个控制器输入的开关控制器。 当开关关闭时，电感电流可以返回到变压器，当开关打开时，电感电流提供给耦合到负载的整流器。 控制器输入可以包括接收变压器输出的变压器输入，指示开关电流的感测输入和指示负载电压的负载输入。 控制器逻辑可以使开关的控制信号的断言与变压器输出的边沿转换同步，以将峰值电感电流保持在指定范围内，并有选择地将电感中的能量转移到负载或返回到变压器。

公开(公告)号：US20140333205A1

公开(公告)日：2014-11-13

申请号：US14276535

申请日：2014-05-13

Applicant: Cirrus Logic, Inc.

Inventor： Michael A. Kost ,  Eric J. King ,  John L. Melanson ,  Kan Wang ,  Ramin Zanbaghi

IPC: H02M5/458 ,  H05B33/08

CPC classification number: H02M5/458 ,  H05B33/0815 ,  H05B33/0887

Abstract: An electronic transformer stabilization circuit includes a detection circuit and a reactive load. The detection circuit may be configured to receive a transformer output or a transformer signal derived from the transformer output. The detection circuit may determine whether the transformer that generated the transformer output is an electronic transformer. The determination may be made based on the presence of absence of high frequency components in the transformer output. Responsive to determining that an electronic transformer generated the transformer output, the stabilization circuit may operate a switch to connect the reactive load across an output of the transformer. The reactive load may include an inductor and may be configured to draw a stabilization current from the transformer. The stabilization current may ensure that the total current drawn from the transformer exceeds an oscillation current required to maintain reliable operation of the electronic transformer.

Abstract translation: 电子变压器稳定电路包括检测电路和无功负载。 检测电路可以被配置为接收从变压器输出导出的变压器输出或变压器信号。 检测电路可以确定产生变压器输出的变压器是电子变压器。 可以基于变压器输出中是否存在高频分量进行确定。 响应于确定电子变压器产生变压器输出，稳定电路可以操作开关以连接变压器输出端上的无功负载。 无功负载可以包括电感器，并且可以被配置成从变压器抽出稳定电流。 稳定电流可以确保从变压器抽出的总电流超过维持电子变压器可靠运行所需的振荡电流。

公开(公告)号：US09209685B2

公开(公告)日：2015-12-08

申请号：US14088637

申请日：2013-11-25

Applicant: Cirrus Logic, Inc.

Inventor： Alfredo R. Linz ,  Shatam Agarwal ,  Kan Wang

IPC: H02M5/42 ,  H02M3/156 ,  H05B37/02 ,  H02M7/04 ,  H05B33/08

CPC classification number: H02M3/156 ,  H02M7/04 ,  H05B33/0851 ,  H05B37/0227

Abstract: A variable resistance device may be used in a dimmer compatibility circuit to reduce power dissipation in an integrated circuit of the dimmer compatibility circuit. For example, the integrated circuit may include switches coupled to resistors external to the integrated circuit. The integrated circuit may operate the switches to commutate among the external resistors and select a voltage drop that reduces a voltage at a drain voltage of the switches. The reduced drain voltage reduces power dissipation in the switches and instead dissipates the power in the external resistors.

Abstract translation: 可变电阻器件可用于调光器兼容性电路中以减少调光器兼容性电路的集成电路中的功率耗散。 例如，集成电路可以包括耦合到集成电路外部的电阻器的开关。 集成电路可以操作开关以在外部电阻器之间进行换向，并选择降压开关漏极电压的电压降。 降低的漏极电压降低了开关中的功耗，并消除了外部电阻器的电源。

公开(公告)号：US20150145438A1

公开(公告)日：2015-05-28

申请号：US14088637

申请日：2013-11-25

Applicant: Cirrus Logic, Inc.

Inventor： Alfredo R. Linz ,  Shatam Agarwal ,  Kan Wang

IPC: H02M3/156 ,  H02M7/04 ,  H05B33/08

CPC classification number: H02M3/156 ,  H02M7/04 ,  H05B33/0851 ,  H05B37/0227

Abstract: A variable resistance device may be used in a dimmer compatibility circuit to reduce power dissipation in an integrated circuit of the dimmer compatibility circuit. For example, the integrated circuit may include switches coupled to resistors external to the integrated circuit. The integrated circuit may operate the switches to commutate among the external resistors and select a voltage drop that reduces a voltage at a drain voltage of the switches. The reduced drain voltage reduces power dissipation in the switches and instead dissipates the power in the external resistors.

Abstract translation: 可变电阻器件可用于调光器兼容性电路中以减少调光器兼容性电路的集成电路中的功率耗散。 例如，集成电路可以包括耦合到集成电路外部的电阻器的开关。 集成电路可以操作开关以在外部电阻器之间进行换向，并选择降压开关漏极电压的电压降。 降低的漏极电压降低了开关中的功耗，并消除了外部电阻器的电源。