公开(公告)号：EP0802487A2

公开(公告)日：1997-10-22

申请号：EP97302535.6

申请日：1997-04-14

Applicant: Compaq Computer Corporation

Inventor： Sides, Chi Kim ,  McKenzie, Philip J. ,  Basile, Barry S.

IPC: G06F13/40

CPC classification number: G06F13/4081 ,  H02H9/004

Abstract: A protection circuit 116 for a computer system 110 having PCI expansion cards 120 and PCI expansion slots 118 with multiple power rails 312,322;314,328;318,324;320,326 for supplying power to the PCI expansion cards is disclosed. The protection circuit includes a current monitor 212 that monitors the current levels drawn by the PCI expansion card at each power rail. An inrush current controller 330/332/334 controls the initial current applied to each of the power rails when an expansion card is initially inserted into an expansion slot. A voltage monitor 212 monitors the voltage levels applied to selected power rails and a disconnector 210 disconnects the power to the PCI expansion slot when either the current level drawn by the PCI expansion card at any of the power rails goes beyond a selected range or when the voltage levels at any of the selected monitored power rails are below a selected threshold, or when commanded to by the computer system.

Abstract translation: 公开了一种用于具有PCI扩展卡120的计算机系统110的保护电路116和具有用于向PCI扩展卡供电的多个电源轨312,322,314,328,318,324,320,326的PCI扩展槽118。 保护电路包括电流监视器212，其监视由PCI扩展卡在每个电力轨上绘制的电流水平。 浪涌电流控制器330/332/334控制当扩展卡最初插入到扩展槽中时施加到每个电源轨的初始电流。 电压监视器212监视施加到所选择的电源轨的电压电平，并且当PCI扩展卡在任何电源轨下拉出的电流水平超过所选择的范围时，断路器210断开与PCI扩展槽的电力，或者当 所选择的所监视的电力轨道中的任何一个电压电平都低于选定的阈值，或者由计算机系统命令。

公开(公告)号：EP0572207B1

公开(公告)日：1998-08-26

申请号：EP93304030.5

申请日：1993-05-25

Applicant: Compaq Computer Corporation

Inventor： Mitchell, Nathan A. ,  McKenzie, Philip J.

IPC: H05B41/392 ,  G02F1/1335

CPC classification number: H05B41/3922 ,  G09G3/3406 ,  G09G2320/0606 ,  G09G2320/064 ,  G09G2360/145

公开(公告)号：EP0572207A2

公开(公告)日：1993-12-01

申请号：EP93304030.5

申请日：1993-05-25

Applicant: Compaq Computer Corporation

Inventor： Mitchell, Nathan A. ,  McKenzie, Philip J.

IPC: H05B41/392 ,  G02F1/1335

CPC classification number: H05B41/3922 ,  G09G3/3406 ,  G09G2320/0606 ,  G09G2320/064 ,  G09G2360/145

Abstract: A LCD backlight system which regulates the light generated by the lamp by controlling the intensity of the light using a photoresistor cell. The current provided to the lamp is controlled by a pulse width modulation (PWM) signal. The PWM signal responds to brightness adjustments by the user and to a photoresistor exposed to the light from the lamp. An operational amplifier circuit controls the PWM signal so that if the lamp is too bright, the current to the lamp is reduced, and if the lamp is too dim, the current to the lamp is increased. When the lamp brightness reaches the appropriate intensity, the output of the operational amplifier is unchanging, causing the intensity of the lamp to remain stable.

Abstract translation: 一种LCD背光系统，其通过使用光电晶体管控制光的强度来调节由灯产生的光。 提供给灯的电流由脉冲宽度调制（PWM）信号控制。 PWM信号响应用户的亮度调节和暴露于来自灯的光的光敏电阻。 运算放大器电路控制PWM信号，使得如果灯太亮，则灯的电流降低，并且如果灯太暗，则增加到灯的电流。 当灯泡亮度达到适当的强度时，运算放大器的输出不变，导致灯泡的强度保持稳定。

公开(公告)号：EP0572207A3

公开(公告)日：1994-01-05

申请号：EP93304030.5

申请日：1993-05-25

Applicant: Compaq Computer Corporation

Inventor： Mitchell, Nathan A. ,  McKenzie, Philip J.

IPC: H05B41/392 ,  G02F1/1335

CPC classification number: H05B41/3922 ,  G09G3/3406 ,  G09G2320/0606 ,  G09G2320/064 ,  G09G2360/145

Abstract: A LCD backlight system which regulates the light generated by the lamp by controlling the intensity of the light using a photoresistor cell. The current provided to the lamp is controlled by a pulse width modulation (PWM) signal. The PWM signal responds to brightness adjustments by the user and to a photoresistor exposed to the light from the lamp. An operational amplifier circuit controls the PWM signal so that if the lamp is too bright, the current to the lamp is reduced, and if the lamp is too dim, the current to the lamp is increased. When the lamp brightness reaches the appropriate intensity, the output of the operational amplifier is unchanging, causing the intensity of the lamp to remain stable.

Abstract translation: 一种LCD背光系统，通过使用光敏电阻单元控制光的强度来调节由灯产生的光。 提供给灯的电流由脉宽调制（PWM）信号控制。 PWM信号响应用户的亮度调节并响应暴露于来自灯的光的光敏电阻。 运算放大器电路控制PWM信号，以便如果灯太亮，则灯的电流减小，并且如果灯太暗，则灯的电流增加。 当灯的亮度达到适当的强度时，运算放大器的输出不变，导致灯的强度保持稳定。