公开(公告)号：US20150028768A1

公开(公告)日：2015-01-29

申请号：US14341984

申请日：2014-07-28

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Thirumalai Rengachari ,  Siddharth Maru ,  Ramin Zanbaghi ,  Firas Azrai ,  Rahul Singh

IPC: H05B33/08 ,  H02M3/156

CPC classification number: H05B33/0815 ,  H02M3/156 ,  H05B33/0845 ,  H05B37/02

Abstract: A turn-off transition time period, also referred to as a reverse recovery time period, may be compensated for by a controller of a power stage including a bipolar junction transistor (BJT). The reverse recovery time period may be measured in one switching cycle and a subsequent switching cycle may include compensations based on the measured reverse recovery time period. That is the switching on and off of the BJT may be compensated to obtain a desired average output current to a load. When the reverse recovery time period is known, an error in the peak current obtained due to the reverse recovery time period may be calculated. The calculated error may be used to offset the target peak current for controlling the switching of the BJT to begin a turn-off transition of the BJT earlier in a switching cycle and thus reduce error in peak current at the BJT.

Abstract translation: 还可以通过包括双极结型晶体管（BJT）的功率级的控制器补偿关断转换时间段（也称为反向恢复时间周期）。 可以在一个开关周期内测量反向恢复时间段，并且随后的开关周期可以包括基于所测量的反向恢复时间段的补偿。 也就是说，可以补偿BJT的接通和断开以获得期望的负载平均输出电流。 当已知反向恢复时间周期时，可以计算由于反向恢复时间段而获得的峰值电流的误差。 计算出的误差可用于偏移目标峰值电流，以控制BJT的开关，以便在开关周期中较早地开始BJT的关断转换，从而减小BJT的峰值电流误差。

公开(公告)号：US20140265916A1

公开(公告)日：2014-09-18

申请号：US14212376

申请日：2014-03-14

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Prashanth Drakshapalli ,  Siddharth Maru ,  Rahul Singh

IPC: H05B33/08

CPC classification number: H05B33/0809 ,  H05B33/0815 ,  H05B33/0848 ,  Y02B20/346 ,  Y02B20/383

Abstract: An electronic system and method include a controller to actively control transfer of excess energy to an auxiliary-winding of an auxiliary power dissipation circuit. The excess energy is a transfer of energy from a primary winding of a switching power converter to the auxiliary-winding of the auxiliary power dissipation circuit. In at least one embodiment, the electronic system is a lighting system that includes a triac-based dimmer. The excess energy is energy drawn through the primary-side winding of the switching power converter to provide operational compatibility between a dimmer through which a power supply provides energy to the switching power converter and a load to which the switching power converter provides energy.

Abstract translation: 电子系统和方法包括控制器，用于主动地控制向辅助功率耗散电路的辅助绕组传递过剩能量。 过量的能量是能量从开关功率转换器的初级绕组传递到辅助功率耗散电路的辅助绕组。 在至少一个实施例中，电子系统是包括基于三端双向可控硅的调光器的照明系统。 过量的能量是通过开关功率转换器的初级侧绕组抽取的能量，以提供调光器之间的操作兼容性，通过该调光器，电源向开关功率转换器提供能量和开关功率转换器提供能量的负载。

公开(公告)号：US09735671B2

公开(公告)日：2017-08-15

申请号：US14280539

申请日：2014-05-16

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Ramin Zanbaghi ,  Jieyeon Choi ,  Firas Azrai ,  Rahul Singh ,  Siddharth Maru

IPC: H05B33/08 ,  H02M3/07 ,  H02M1/08 ,  H03K17/64 ,  H02M3/335 ,  H02M1/00

CPC classification number: H02M3/07 ,  H02M1/08 ,  H02M3/335 ,  H02M2001/0006 ,  H03K17/64 ,  H05B33/0815 ,  H05B33/0845

Abstract: A bipolar junction transistor (BJT) may be used to generate a supply voltage for operating a controller, such as a lighting controller for a LED-based light bulb. A base of the BJT may receive current generated from the supply voltage to control operation of the BJT. Although the base of the BJT would be at a lower voltage than the emitter, a base drive circuit may be coupled between the emitter and the base of the BJT to increase the voltage. As one example, the base drive circuit may be a charge pump. In another example, the BJT may function as its own charge pump. In yet another example, a positive and a negative base current of the BJT may be independently controlled to regulate an output supply voltage VDD from the BJT.

公开(公告)号：US09167662B2

公开(公告)日：2015-10-20

申请号：US13774914

申请日：2013-02-22

Applicant: Cirrus Logic, Inc.

Inventor： Eric J. King ,  John L. Melanson ,  Daniel J. Baker ,  Mohit Sood ,  Rahul Singh

IPC: H05B37/02 ,  H05B33/08

CPC classification number: H05B37/02 ,  H05B33/0815 ,  H05B33/0845

Abstract: In at least one embodiment, a system and method provide current compensation in a lighting system by controlling a lamp current to prevent a current through a triac-based dimmer from undershooting a holding current value. In at least one embodiment, at least one of the lamps includes a controller that controls circuitry in the lamp to draw more lamp current for a period of time than needed to illuminate a brightness of the lamp at a level corresponding to particular phase-cut angle of the supply voltage. By drawing more current than needed, the controller increases the dimmer current during the period of time to prevent the dimmer current from falling below the holding current value. In at least one embodiment, the period of time corresponds to a compensating pulse of the lamp current at a time when the dimmer current would otherwise fall below the holding current value.

Abstract translation: 在至少一个实施例中，系统和方法通过控制灯电流来提供照明系统中的电流补偿，以防止通过基于三端双向可控硅开关控制器的调光器的电流低于保持电流值。 在至少一个实施例中，灯中的至少一个包括控制器，该控制器控制灯中的电路，以在比与特定相切角对应的水平下照亮灯的亮度所需的时间段吸取更多的灯电流 的电源电压。 通过吸收比所需更多的电流，控制器在一段时间内增加调光器电流，以防止调光器电流降至保持电流值以下。 在至少一个实施例中，该时间段对应于当调光电流否则将低于保持电流值时的灯电流的补偿脉冲。

公开(公告)号：US20150028764A1

公开(公告)日：2015-01-29

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: 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。