Perceptually linear LED brightness control
    11.
    发明申请
    Perceptually linear LED brightness control 失效
    感知线性LED亮度控制

    公开(公告)号:US20090195191A1

    公开(公告)日:2009-08-06

    申请号:US12320503

    申请日:2009-01-28

    IPC分类号: H05B37/02

    摘要: A current regulator includes a first current source to provide a reference current varying with a dimming step, and a second current source to generate a drive current for a white LED according to the reference current. The reference current and the dimming step have a relationship identical to or approximating a relationship between luminance and lightness perceived by human eyes. Thus, the white LED is controlled to have a linear variation of the luminance perceived by human eyes when the dimming step is changed.

    摘要翻译: 电流调节器包括:第一电流源,用于提供随着调光步长变化的参考电流;以及第二电流源,以根据参考电流产生白光LED的驱动电流。 参考电流和调光步骤具有与人眼感知的亮度和亮度之间的关系相同或近似的关系。 因此,当改变调光步骤时,白色LED被控制为具有人眼感知的亮度的线性变化。

    Offset cancellation of a single-ended operational amplifier
    12.
    发明申请
    Offset cancellation of a single-ended operational amplifier 有权
    单端运算放大器的偏移消除

    公开(公告)号:US20090128238A1

    公开(公告)日:2009-05-21

    申请号:US12292061

    申请日:2008-11-12

    IPC分类号: H03F3/45

    摘要: A single-ended operational amplifier includes an output stage, a first transconductance amplifier and a second transconductance amplifier. In an offset cancellation mode, two inputs of the first transconductance amplifier are supplied with a reference voltage to sink two currents from two inputs of the output stage respectively, the output stage generates a third current according to the difference between the two currents to charge a capacitor, and the second transconductance amplifier generates two currents according to the voltage in the capacitor to make currents in the two inputs of the output stage equal to each other, thereby canceling the offset of the single-ended operational amplifier.

    摘要翻译: 单端运算放大器包括输出级,第一跨导放大器和第二跨导放大器。 在偏移消除模式中,第一跨导放大器的两个输入端被提供有参考电压,以分别从输出级的两个输入端吸收两个电流,输出级根据两个电流之间的差产生第三电流,以对 电容器和第二跨导放大器根据电容器中的电压产生两个电流,以使输出级的两个输入端中的电流彼此相等,从而消除单端运算放大器的偏移。

    Current regulator and method for efficiency improvement of a LED display system
    13.
    发明授权
    Current regulator and method for efficiency improvement of a LED display system 失效
    LED显示系统的电流调节器和效率改进方法

    公开(公告)号:US08138686B2

    公开(公告)日:2012-03-20

    申请号:US12588702

    申请日:2009-10-26

    IPC分类号: H05B37/02

    CPC分类号: H05B33/0848

    摘要: For efficiency improvement of a LED display system including a charge pump and a LED connected to either the voltage input terminal or the voltage output terminal of the charge pump, either one or both of two current regulators are enabled according to a voltage detected from the LED, for establishing a driving current for the LED. When the detected voltage is higher than a threshold, the first one of the current sources is enabled sole. When the detected voltage is lower than the threshold, the second one of the current sources is enabled sole, or both the current sources are enabled, or the current sources are alternatively enabled.

    摘要翻译: 为了提高LED显示系统的效率,包括电荷泵和连接到电荷泵的电压输入端子或电压输出端子的LED的LED显示系统,两个电流调节器中的一个或两个根据从LED检测的电压被使能 ,用于建立LED的驱动电流。 当检测到的电压高于阈值时,电流源中的第一个可以被单独使能。 当检测到的电压低于阈值时,第二个电流源被启用,或者两个电流源都被使能,或者当前源被备选地使能。

    Low noise multiphase charge pump and control method thereof
    14.
    发明授权
    Low noise multiphase charge pump and control method thereof 有权
    低噪声多相电荷泵及其控制方法

    公开(公告)号:US07518432B2

    公开(公告)日:2009-04-14

    申请号:US11643851

    申请日:2006-12-22

    IPC分类号: G05F1/10

    CPC分类号: H02M3/07

    摘要: A low noise multiphase charge pump comprises a plurality of capacitors and a plurality of switches configured as a network, the switches are so switched that the charge pump operates in at least three phases by turns, and the operational durations and the operational currents of the phases are preferably balanced, so as to reduce the noise of the charge pump.

    摘要翻译: 低噪声多相电荷泵包括多个电容器和被配置为网络的多个开关,开关被切换,使得电荷泵至少在三相中工作,并且各相的工作持续时间和工作电流 优选地是平衡的,以便降低电荷泵的噪声。

    Low noise multiphase charge pump and control method thereof
    15.
    发明申请
    Low noise multiphase charge pump and control method thereof 有权
    低噪声多相电荷泵及其控制方法

    公开(公告)号:US20070152737A1

    公开(公告)日:2007-07-05

    申请号:US11643851

    申请日:2006-12-22

    IPC分类号: G05F1/10

    CPC分类号: H02M3/07

    摘要: A low noise multiphase charge pump comprises a plurality of capacitors and a plurality of switches configured as a network, the switches are so switched that the charge pump operates in at least three phases by turns, and the operational durations and the operational currents of the phases are preferably balanced, so as to reduce the noise of the charge pump.

    摘要翻译: 低噪声多相电荷泵包括多个电容器和被配置为网络的多个开关,开关被切换,使得电荷泵至少在三相中工作,并且各相的工作持续时间和工作电流 优选地是平衡的,以便降低电荷泵的噪声。

    Charge pump regulator and method of producing a regulated voltage
    16.
    发明授权
    Charge pump regulator and method of producing a regulated voltage 有权
    电荷泵调节器和产生调节电压的方法

    公开(公告)号:US08362823B2

    公开(公告)日:2013-01-29

    申请号:US12719251

    申请日:2010-03-08

    IPC分类号: G05F1/00

    CPC分类号: H02M3/07 H02M2001/0045

    摘要: A charge pump regulator has a charge pump to establish a charge path and a discharge path alternately, so as to produce a regulated voltage on an output terminal. The charge pump has at least a current control element on the charge path or the discharge path to control the current flowing therethrough according to an output-dependent feedback signal.

    摘要翻译: 电荷泵调节器具有电荷泵,以交替地建立充电路径和放电路径,以便在输出端子上产生调节电压。 电荷泵在充电路径或放电路径上至少具有电流控制元件,以根据输出相关的反馈信号来控制流过其中的电流。

    Charge pump regulator and method of producing a regulated voltage
    17.
    发明授权
    Charge pump regulator and method of producing a regulated voltage 失效
    电荷泵调节器和产生调节电压的方法

    公开(公告)号:US08310299B2

    公开(公告)日:2012-11-13

    申请号:US12719240

    申请日:2010-03-08

    IPC分类号: G05F1/10

    CPC分类号: H02M3/07 H02M2001/0045

    摘要: A charge pump regulator has a charge pump to establish a charge path and a discharge path alternately, so as to produce a regulated voltage on an output terminal. The charge pump has at least a current control element on the charge path or the discharge path to control the current flowing therethrough according to an output-dependent feedback signal.

    摘要翻译: 电荷泵调节器具有电荷泵,以交替地建立充电路径和放电路径,以便在输出端子上产生调节电压。 电荷泵在充电路径或放电路径上至少具有电流控制元件,以根据输出相关的反馈信号来控制流过其中的电流。

    Charge pump regulator and method of producing a regulated voltage
    19.
    发明申请
    Charge pump regulator and method of producing a regulated voltage 有权
    电荷泵调节器和产生调节电压的方法

    公开(公告)号:US20080197898A1

    公开(公告)日:2008-08-21

    申请号:US12068040

    申请日:2008-02-01

    IPC分类号: H03L7/06

    CPC分类号: H02M3/07 H02M2001/0045

    摘要: A charge pump regulator has a charge pump to establish a charge path and a discharge path alternately, so as to produce a regulated voltage on an output terminal. The charge pump has at least a current control element on the charge path or the discharge path to control the current flowing therethrough according to an output-dependent feedback signal.

    摘要翻译: 电荷泵调节器具有电荷泵,以交替地建立充电路径和放电路径,以便在输出端子上产生调节电压。 电荷泵在充电路径或放电路径上至少具有电流控制元件,以根据输出相关的反馈信号来控制流过其中的电流。