公开(公告)号：US07880404B2

公开(公告)日：2011-02-01

申请号：US12020458

申请日：2008-01-25

申请人： Qi Deng ,  Hardik D. Patel

发明人： Qi Deng ,  Hardik D. Patel

IPC分类号： G05F1/00

CPC分类号： H05B33/0827 ,  H05B33/0812 ,  H05B33/0818 ,  Y02B20/345 ,  Y02B20/347

摘要： Various circuits are described herein where a series transistor used to control current through a string of LEDs, driven by a high voltage, is not subjected to the high voltage when the transistor is turned off pursuant to a PWM signal. To avoid the transistor experiencing the high voltage, the HV regulator is disabled shortly before the transistor is turned off and is enabled shortly after the transistor has turned back on. Control circuits for controlling the regulator and transistor include delay circuits and/or voltage sensing circuits to ensure that the transistor is always on prior to the voltage regulator being enabled pursuant to the incoming PWM signal, and the voltage regulator is always disabled when the first transistor is off pursuant to the incoming PWM signal.

摘要翻译： 这里描述了各种电路，其中用于控制通过高压驱动的一串LED的电流的串联晶体管在晶体管根据PWM信号关断时不受高电压的影响。 为了避免晶体管经历高电压，HV调节器在晶体管截止之前不久就被禁止，并且在晶体管重新接通后不久就能使能。 用于控制调节器和晶体管的控制电路包括延迟电路和/或电压感测电路，以确保晶体管总是在电压调节器根据输入的PWM信号使能之前导通，并且当第一晶体管 根据输入的PWM信号关闭。

公开(公告)号：US07675278B2

公开(公告)日：2010-03-09

申请号：US11864440

申请日：2007-09-28

申请人： Hardik D. Patel

发明人： Hardik D. Patel

IPC分类号： G05F1/00 ,  G05F1/565 ,  H02M1/00

CPC分类号： H02H9/025 ,  H02H1/04 ,  H02H7/0816 ,  Y10S323/908

摘要： A method for operating a current limit power switch for supplying power to a load include activating the power switch to start supplying power to the load; limiting the current drawn by the power switch to a first current limit for a first, fixed duration; after the first, fixed duration, limiting the current drawn by the power switch to a second current limit for a second duration where the second current limit is less than the first current limit; and after the second duration, limiting the current drawn by the power switch to a third current limit where the third current limit is less than the second current limit.

摘要翻译： 用于操作向负载供电的限流电源开关的方法包括启动电源开关以开始向负载供电; 将由电源开关汲取的电流限制为第一固定持续时间的第一电流限制; 在第一固定持续时间之后，将第二电流限制小于第一电流限制的第二持续时间限制由电源开关吸收的电流到第二电流限制; 并且在第二持续时间之后，将由电源开关汲取的电流限制到第三电流限制，其中第三电流限制小于第二电流限制。

公开(公告)号：US20090189539A1

公开(公告)日：2009-07-30

申请号：US12020458

申请日：2008-01-25

申请人： Qi Deng ,  Hardik D. Patel

发明人： Qi Deng ,  Hardik D. Patel

IPC分类号： H05B41/36

CPC分类号： H05B33/0827 ,  H05B33/0812 ,  H05B33/0818 ,  Y02B20/345 ,  Y02B20/347

摘要： Various circuits are described herein where a series transistor used to control current through a string of LEDs, driven by a high voltage, is not subjected to the high voltage when the transistor is turned off pursuant to a PWM signal. To avoid the transistor experiencing the high voltage, the HV regulator is disabled shortly before the transistor is turned off and is enabled shortly after the transistor has turned back on. Control circuits for controlling the regulator and transistor include delay circuits and/or voltage sensing circuits to ensure that the transistor is always on prior to the voltage regulator being enabled pursuant to the incoming PWM signal, and the voltage regulator is always disabled when the first transistor is off pursuant to the incoming PWM signal.

摘要翻译： 这里描述了各种电路，其中用于控制通过高压驱动的一串LED的电流的串联晶体管在晶体管根据PWM信号关断时不受高电压的影响。 为了避免晶体管经历高电压，HV调节器在晶体管截止之前不久就被禁止，并且在晶体管重新接通后不久就能使能。 用于控制调节器和晶体管的控制电路包括延迟电路和/或电压感测电路，以确保晶体管总是在电压调节器根据输入的PWM信号使能之前导通，并且当第一晶体管 根据输入的PWM信号关闭。