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11. 发明申请

US20140015427A1 MULTI-STRING LED DRIVE SYSTEM 有权
标题翻译：多功能LED驱动系统
公开(公告)号：US20140015427A1
公开(公告)日：2014-01-16
申请号：US13919371
申请日：2013-06-17
申请人： ANALOG DEVICES, INC.
发明人： Eric Sagen , Jonathan Kraft , Kenneth G. Richardson
IPC分类号： H05B33/08
CPC分类号： H05B33/083 , H05B33/0815 , H05B33/0827 , Y02B20/347
摘要： A drive system for multiple LED strings powered by a common line voltage. Current control circuits are connected in series with respective LED strings; each current control circuit includes a drive transistor (typically a FET) which causes a desired LED string current to be conducted. In one embodiment, the current conducted by a selected one of the LED strings is controlled by the line voltage regulation loop, while the currents conducted by the remaining LED strings are controlled by respective local current loops, thus avoiding conflicts between the local current and line voltage regulation loops. The LED string to be current regulated by the line voltage regulation loop can be determined by a variety of criteria, such as the current control circuit having the maximum FET gate voltage, the minimum FET source voltage, the minimum FET drain voltage, the maximum FET gate-source voltage, or the minimum FET drain-source voltage.
摘要翻译：用于由公共线路电压供电的多个LED串的驱动系统。电流控制电路与相应的LED串串联; 每个电流控制电路包括导致期望的LED串电流的驱动晶体管（通常为FET）。在一个实施例中，由所选择的一个LED串所传导的电流由线路电压调节回路控制，而由剩余LED串传导的电流由各自的局部电流回路控制，从而避免局部电流和线路之间的冲突电压调节回路。由电压调节回路调节的LED串可以通过各种标准来确定，例如具有最大FET栅极电压，最小FET源电压，最小FET漏极电压，最大FET的电流控制电路栅源电压或最小FET漏源电压。

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