公开(公告)号：US5914484A

公开(公告)日：1999-06-22

申请号：US636656

申请日：1996-04-23

申请人： Hideki Tawarayama ,  Yoshitaka Koharagi

发明人： Hideki Tawarayama ,  Yoshitaka Koharagi

IPC分类号： H01L33/00 ,  G01R13/40 ,  G11B7/125 ,  H01S5/06 ,  H01S5/0683 ,  G02F1/01 ,  H01S3/10

CPC分类号： G11B7/126 ,  G01R13/402 ,  H01S5/06832

摘要： Luminous energy of a light-emitting element in an optical device is adjusted to a desired level by a light adjusting circuit including a light-receiving element adapted to detect the level of luminous energy of light emitted from the light-emitting element, an up/down counter circuit for counting clock signals up or down according to the level detected by the light-receiving element, and a current adjusting circuit for resetting the current intensity supplied to the light-emitting element according to output data from the up/down counter circuit.

摘要翻译： 光学装置中的发光元件的发光能量通过包括适于检测从发光元件发出的光的光能水平的光接收元件的调光电路调节到期望的水平， 用于根据由光接收元件检测到的电平上升或下降计数时钟信号的递减计数器电路，以及用于根据来自上/下计数器电路的输出数据复位提供给发光元件的电流强度的电流调节电路 。

公开(公告)号：US06844760B2

公开(公告)日：2005-01-18

申请号：US10681084

申请日：2003-10-08

申请人： Yoshitaka Koharagi ,  Masashi Nogawa

发明人： Yoshitaka Koharagi ,  Masashi Nogawa

IPC分类号： H02M3/155 ,  H03K17/14 ,  H03K17/687 ,  H03K17/78 ,  H03B1/00

CPC分类号： H03K17/687 ,  H03K17/145

摘要： A drive circuit for LEDs or other light-emitting elements with which the influence of the changes in temperature or power supply voltage and the element variations can be restrained in order to output a pulse current with a constant level. When n-type MOS transistor 10 is on, power is supplied from switching power supply 60 to the LED, and the current of LED is detected by resistor 20. The error signal Serr between said detection signal Sfb and setpoint signal Sref is generated by error signal generating unit 30 and is averaged by signal holding unit 40. The power supplied to the LED is controlled corresponding to the averaged error signal SerrA. When n-type MOS transistor 10 is turned off from the on state, the power supplied to the LED is stopped, and error signal SerrA is held in signal holding unit 40. When n-type MOS transistor 10 is turned on from the off state, the averaging of error signal Serr is started with the signal level of the held error signal SerrA used as the initial level.

摘要翻译： 用于LED或其他发光元件的驱动电路可以抑制温度变化或电源电压和元件变化的影响，以便输出具有恒定电平的脉冲电流。 当n型MOS晶体管10导通时，从开关电源60向LED提供电力，并且由电阻器20检测LED的电流。所述检测信号Sfb与设定点信号Sref之间的误差信号Serr由误差产生 信号产生单元30并由信号保持单元40进行平均。对应于平均误差信号SerrA控制提供给LED的功率。 当n型MOS晶体管10从导通状态断开时，提供给LED的电力停止，并且误差信号SerrA保持在信号保持单元40中。当n型MOS晶体管10从断开状态接通时 ，误差信号Serr的平均值以保持的误差信号SerrA的信号电平开始，作为初始电平。