LED lighting device with output impedance control

专利名称：LED lighting device with output impedance

control

发明人：Sana Esaki,Akinori Hiramatsu申请号：US13343827申请日：20120105公开号：US08766561B2公开日：20140701

专利附图：

摘要：An LED lighting device is provided with output impedance control to stabilize anoptical output across a wide current range. A switching power supply generates theoutput current, with switching control circuitry to determine switching frequency and an

ON period for an associated switch, and to turn on/off the switch according to thedetermined frequency and ON period. An impedance element is coupled across outputterminals for the lighting device, with an impedance value set so that a load current islarger than a current flowing to the impedance element at maximum on-duty of theswitch and a current flowing to the impedance element is larger than the load current atminimum on-duty. The impedance element may be a variable impedance element,wherein an impedance control circuit adjusts the variable impedance such that animpedance value for minimum on-duty of the switch is smaller than that for a maximumon-duty.

申请人：Sana Esaki,Akinori Hiramatsu

地址：Osaka JP,Nara JP

国籍：JP,JP

代理机构：Waddey Patterson

代理人：Mark J. Patterson,Gary L. Montle

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