公开(公告)号：US09648687B2

公开(公告)日：2017-05-09

申请号：US14465580

申请日：2014-08-21

Applicant: Cree, Inc.

Inventor： Daniel Pope ,  Mike Walters

IPC: H05B33/08

CPC classification number: H05B33/0845 ,  H05B33/0815 ,  Y02B20/347

Abstract: An apparatus includes a plurality of series-connected current control circuits configured to control a current therethrough responsive to at least one current reference signal and to be coupled in parallel with a load, such as a string of LEDs. The apparatus further includes a voltage control circuit configured to control respective voltages across respective ones of the current control circuits. In some embodiments, the voltage control circuit may be configured to individually adjust responses of the current control circuits responsive to the voltages across the current control circuits. In further embodiments, the voltage control circuit may include respective voltage limiters coupled across respective ones of the current control circuits.

公开(公告)号：US09504105B2

公开(公告)日：2016-11-22

申请号：US14296196

申请日：2014-06-04

Applicant: Cree, Inc.

Inventor： Ashish Ekbote ,  Mike Walters

IPC: H02M7/44 ,  H05B33/08 ,  H02M3/158 ,  H02M3/156 ,  H02M7/217 ,  H02M1/42 ,  H02M1/00

CPC classification number: H05B33/0815 ,  H02M1/4225 ,  H02M1/4258 ,  H02M3/156 ,  H02M3/158 ,  H02M7/217 ,  H02M7/2176 ,  H02M2001/0025 ,  Y02B20/346 ,  Y02B70/126

Abstract: A switched mode power supply may include circuitry configured to output a bias signal that turns off and on switching circuitry of the switched mode power supply. The circuitry may wait for a first time period determined by the bias signal, and output the bias signal to turn off the switching circuitry when the time period expires. In addition or alternatively, the circuitry may begin waiting for a second time period when the bias signal turns off the switching circuitry. The circuitry may turn on the switching circuitry either when energy in inductive storage circuitry is depleted or when the second time period expires.

Abstract translation: 开关模式电源可以包括被配置为输出偏置信号的电路，所述偏置信号关断和开关模式电源的开关电路。 电路可以等待由偏置信号确定的第一时间段，并且当时间段到期时输出偏置信号以关断开关电路。 另外或替代地，当偏置信号关断开关电路时，电路可以开始等待第二时间段。 当电感性存储电路中的能量耗尽时或者当第二时间段到期时，该电路可以导通开关电路。