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公开(公告)号:US08350623B2
公开(公告)日:2013-01-08
申请号:US13047505
申请日:2011-03-14
申请人: Brett Forejt , Jeff Berwick , David J. Baldwin
发明人: Brett Forejt , Jeff Berwick , David J. Baldwin
IPC分类号: H03F3/45
CPC分类号: H03F3/45654 , H03F3/45179 , H03F2203/45528 , H03F2203/45562 , H03F2203/45594 , H03G1/0029 , H03G1/007
摘要: An apparatus and method are provided. Generally, an input signal is applied across a main path (through an input network) and across a cancellation path (through a cancellation circuit). The cancellation circuit subtracts a cancellation current from the main path as part of the control mechanism, where the magnitude of the cancellation current is based on a gain control signal (that has been linearized to follow a control voltage).
摘要翻译: 提供了一种装置和方法。 通常,输入信号跨越主路径(通过输入网络)并跨越抵消路径(通过消除电路)施加。 消除电路从主路径减去作为控制机构的一部分的消除电流,其中消除电流的大小基于增益控制信号(已被线性化以跟随控制电压)。
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公开(公告)号:US07119498B2
公开(公告)日:2006-10-10
申请号:US11012793
申请日:2004-12-14
申请人: David J. Baldwin , Sanmukh Patel
发明人: David J. Baldwin , Sanmukh Patel
IPC分类号: G05F1/00
CPC分类号: H05B33/0854 , H05B33/0884
摘要: A current control device for driving LED devices uses a switched-mode current control loop inside of an output intensity low-frequency pulse width modulation (PWM) control loop. This allows separate control of current level (for accurate light wavelength output) and light intensity. The current control device requires only one switch to regulate current level, and no other switches for the intensity control. This allows lower parts count for greater reliability and lower system cost.
摘要翻译: 用于驱动LED器件的电流控制装置在输出强度低频脉宽调制(PWM)控制回路内使用开关模式电流控制回路。 这允许单独控制电流水平(用于准确的光波长输出)和光强度。 电流控制装置只需要一个开关来调节电流电平,而没有其他开关用于强度控制。 这允许较低的部件数量更高的可靠性和更低的系统成本。
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