公开(公告)号：US20070257861A1

公开(公告)日：2007-11-08

申请号：US11418131

申请日：2006-05-05

申请人： Bin Zhang ,  Bryan Legates ,  Eric Young

发明人： Bin Zhang ,  Bryan Legates ,  Eric Young

IPC分类号： G09G3/14

CPC分类号： H05B33/0818

摘要： 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.

摘要翻译： 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。