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    • 5. 发明授权
    • Power control methods and apparatus for variable loads
    • 用于可变负载的功率控制方法和装置
    • US07542257B2
    • 2009-06-02
    • US11225377
    • 2005-09-12
    • Kevin McCormickIhor A. Lys
    • Kevin McCormickIhor A. Lys
    • H02H3/20H02H9/04H02H3/00
    • H05B33/0815H02M1/4258H02M2001/0032H05B33/0818Y02B20/346Y02B70/126Y02B70/16
    • A switching power supply is modified to mitigate potentially adverse effects of near zero loads on power delivery. In one example, a processor-controlled dummy load is coupled to the power supply output in addition to an actual load. The dummy load is controlled so that at least some minimal load is presented to the power supply when the actual load is drawing low or near zero power. In another example, the feedback loop of the switching power supply is modified to mitigate the effects of a potential overvoltage condition in a bias supply from which the switch controller of the power supply draws power, which condition may occur at low or near zero load power. A lighting system may include a switching power supply thusly modified to provide power to a variable load that includes one or more LED-based lighting apparatus.
    • 修改开关电源以减轻近零负载对电力输送的潜在不利影响。 在一个示例中,处理器控制的虚拟负载除了实际负载之外还耦合到电源输出。 控制虚拟负载,使得当实际负载拉低或接近零功率时,至少一些最小负载被呈现给电源。 在另一示例中,修改开关电源的反馈回路以减轻电源的开关控制器从其中获取电力的偏置电源中的电位过电压状况的影响,该状态可能在低或接近零负载功率下发生 。 照明系统可以包括由此被修改以向包括一个或多个基于LED的照明装置的可变负载提供电力的开关电源。