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    • 1. 发明申请
    • Light-emitting Diode (LED) Current Balance Circuit
    • 发光二极管(LED)电流平衡电路
    • US20110127921A1
    • 2011-06-02
    • US12954958
    • 2010-11-29
    • Li-Wei LinChen-Chiang LEEChi-Hsin LEEYuan-Po HUANGWen-Ming LIN
    • Li-Wei LinChen-Chiang LEEChi-Hsin LEEYuan-Po HUANGWen-Ming LIN
    • H05B37/02
    • H05B33/0827H05B33/0887
    • A light-emitting diode (LED) current balance circuit includes a reference current generator, a current mirror and a voltage compensation circuit. The reference current generator provides a reference current robust against disturbance in a supply voltage applied to the reference current generator. The current mirror generates, according to the reference current, sink currents to bias lightbars and employs a structure to reduce the influence of unmatched transistors on the sink currents so as to stabilize and clamp currents through the lightbar. The voltage compensation circuit detects the voltages across the lightbars to compensate the lightbars having various forward voltages so as to ensure the turn-on of all lightbars and effectively balance the currents through the lightbars. Therefore, the invention employs simpler circuit architecture and not need a specific-purpose LED controller so as to be cheaper and more competitive.
    • 发光二极管(LED)电流平衡电路包括参考电流发生器,电流镜和电压补偿电路。 参考电流发生器提供了对施加到参考电流发生器的电源电压中的干扰的参考电流。 电流镜根据参考电流产生吸收电流以偏置光棒并且采用结构来减少不匹配的晶体管对吸收电流的影响,以便稳定和钳制通过光棒的电流。 电压补偿电路检测光束两端的电压,以补偿具有各种正向电压的光棒,以确保所有光条的导通,并有效平衡通过光棒的电流。 因此,本发明采用更简单的电路架构,并且不需要特定目的的LED控制器,以便更便宜和更具竞争力。