公开(公告)号：US07746300B2

公开(公告)日：2010-06-29

申请号：US11418131

申请日：2006-05-05

Applicant: Bin Zhang ,  Bryan A. Legates ,  Eric S. Young

Inventor： Bin Zhang ,  Bryan A. Legates ,  Eric S. Young

IPC: G09G3/32 ,  G09G5/00 ,  G06F3/038 ,  G05F1/00 ,  G05F1/24 ,  H05B37/02 ,  H05B39/04 ,  H05B41/36

CPC classification number: H05B33/0818

Abstract: A circuit for controlling pulsed current to a load, one application of which is in LED dimmer circuitry, comprises first and second reference nodes for receiving a supply voltage, an input node for receiving a timing signal such as a PWM signal, and a controlled switch coupled between the first and second reference voltage nodes for supplying current to the load. Pull-up circuitry may be coupled between a control electrode of the controlled switch and first reference voltage node, and a pull-down switch coupled between the control electrode and second reference voltage node. A control circuit coupled between the input node and control electrode of the controlled switch is configured to control the controlled switch in response to the timing signal. The circuit may further include a reference voltage source configured for producing a voltage of magnitude independent of supply voltage magnitude. The control circuit is coupled to the reference voltage source and operative to control the controlled switch in response to the timing signal and reference voltage.

Abstract translation: 用于控制到负载的脉冲电流的电路，其一个应用在LED调光器电路中，包括用于接收电源电压的第一和第二参考节点，用于接收诸如PWM信号的定时信号的输入节点和受控开关 耦合在用于向负载提供电流的第一和第二参考电压节点之间。 上拉电路可以耦合在受控开关的控制电极和第一参考电压节点之间，以及耦合在控制电极和第二参考电压节点之间的下拉开关。 耦合在受控开关的输入节点和控制电极之间的控制电路被配置为响应于定时信号来控制受控开关。 电路还可以包括被配置为产生与电源电压幅度无关的幅度电压的参考电压源。 控制电路耦合到参考电压源并且可操作以响应于定时信号和参考电压来控制受控开关。

公开(公告)号：US5969574A

公开(公告)日：1999-10-19

申请号：US90711

申请日：1998-06-04

Applicant: Bryan A. Legates

Inventor： Bryan A. Legates

IPC: G01R19/00 ,  H03F3/343 ,  H03F3/04

CPC classification number: H03F3/343 ,  G01R19/0092

Abstract: An accurate, low voltage, low parts-count current sense amplifier can be employed to sense either high side or low side currents. A pair of transistors are connected in a common-base configuration and biased with equal currents, with a sense resistor connected between their respective emitter circuits. A sensed current develops a voltage across the sense resistor which unbalances the transistor currents. A third transistor is connected to provide a feedback current to detect and correct the current imbalance; the feedback current is directly proportional to the sensed current, and serves as the current sense amplifier's output. The current sense amplifier requires only three transistors, can be realized with bipolar or FET devices of either polarity, and can operate at supply voltages as low as about 1.1 volts.

Abstract translation: 可以使用精确的低电压，低零件数电流读出放大器来感测高侧或低侧电流。 一对晶体管以公共基极配置连接并以相等的电流偏置，其中检测电阻连接在它们各自的发射极电路之间。 感测电流在感测电阻器两端产生电压，使电流不平衡。 连接第三晶体管以提供反馈电流以检测和校正电流不平衡; 反馈电流与检测到的电流成正比，并且用作电流检测放大器的输出。 电流检测放大器仅需要三个晶体管，可以用任一极性的双极或FET器件实现，并且可以在低至约1.1伏的电源电压下工作。