发明名称 |
BOOST AND LINEAR LED CONTROL |
摘要 |
A light emitting diode (LED) lighting system includes a switching power converter having an input for coupling to an alternating current (AC) power source, an output, and a switch. The LED lighting system also includes an LED lighting subsystem coupled to receive power from the output of the switching power converter. The LED lighting subsystem includes a current source for one or more LEDs, and the current source has a control node and a sense node. The LED lighting system additionally includes a switch state controller coupled to the switching power converter and coupled to the LED lighting subsystem. The switch state controller controls switching of the switch and varies a control current provided to the control node of the current source based on at least a parameter sensed from the sense node. |
申请公布号 |
US2015145427(A1) |
申请公布日期 |
2015.05.28 |
申请号 |
US201514607412 |
申请日期 |
2015.01.28 |
申请人 |
MELANSON JOHN L.;DRAPER WILLIAM |
发明人 |
MELANSON JOHN L.;DRAPER WILLIAM |
分类号 |
H05B33/08 |
主分类号 |
H05B33/08 |
代理机构 |
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代理人 |
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主权项 |
1. A light emitting diode (LED) lighting subsystem, comprising:
one or more LEDs; a current source for the one or more LEDs, the current source including:
a transistor having a control input coupled to a constant voltage source, a first leg coupled to the one or more LEDs and a second leg; anda current mirror coupled to the second leg of the transistor, the current mirror having a control node, a sense node indicative of an operating point of the LED lighting subsystem, and a transistor size ratio that determines an LED current provided to the one or more LEDs based on a control current received at the control node. |
地址 |
AUSTIN TX US |