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公开(公告)号：US20090015977A1
公开(公告)日：2009-01-15
申请号：US11777260
申请日：2007-07-12
IPC分类号： H02H3/24
摘要： A portable device includes a voltage regulator for generating a regulated voltage that is supplied to a processor and to a load by way of a line protection switch, which controls a load current supplied to the load, e.g., in response to a signal supplied by the processor. The line protection switch includes a gate control circuit with a comparator that detects a short circuit in the load by comparing the regulated voltage against a reference voltage. When a short circuit causes the regulated voltage to drop below a predetermined minimum voltage (e.g., 4.5V), the comparator de-asserts the control signal, thereby turning off the switch before the regulated output voltage falls below a minimum operating voltage (e.g., 4.35V) of the processor.
摘要翻译： 便携式设备包括用于产生调节电压的电压调节器，其通过线路保护开关提供给处理器和负载，该线路保护开关控制提供给负载的负载电流，例如响应于由 处理器。 线路保护开关包括具有比较器的门控电路，该比较器通过将调节电压与参考电压进行比较来检测负载中的短路。 当短路使调节电压下降到预定的最小电压（例如4.5V）以下时，比较器取消断言控制信号，从而在调节的输出电压降到最低工作电压之前关闭开关（例如， 4.35V）的处理器。
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公开(公告)号：US20090085490A1
公开(公告)日：2009-04-02
申请号：US11865695
申请日：2007-10-01
IPC分类号： H05B41/14
CPC分类号： H05B33/0851 , H05B33/0815 , H05B33/083
摘要： A LED driver circuit avoids undesirable light generated by a LED due to leakage current by shunting the output terminal to the feedback terminal during periods when it is desired that the LED remain turned off. The shunting operation is achieved by providing a switch (e.g., a FET) that is connected between the output and feedback terminals of the LED, and is controlled by the user supplied reference signal. During active operation (i.e., when the user supplied reference signal is “enabled” and the LED is lit), the switch remains open, allowing the driver circuit to generate the desired driving voltage across the LED. During inactive periods (i.e., when the user supplied reference signal is “disabled” and the LED is intended to be off), the switch is closed, which couples the output and feedback terminals to generate an essentially zero voltage drop across the LED.
摘要翻译： 在期望LED保持关闭的时段期间，LED驱动器电路避免了由于泄漏电流而由LED产生的不期望的光，其通过将输出端分流到反馈端。 分流操作通过提供连接在LED的输出端和反馈端之间并由用户提供的参考信号控制的开关（例如，FET）来实现。 在有效操作期间（即，当用户提供的参考信号被“使能”并且LED被点亮时），开关保持断开，允许驱动电路在LED两端产生期望的驱动电压。 在非活动期间（即，当用户提供的参考信号被禁用并且LED旨在关闭时），开关闭合，其耦合输出和反馈端子以在LED两端产生基本为零的电压降。
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公开(公告)号：US07622871B2
公开(公告)日：2009-11-24
申请号：US11865695
申请日：2007-10-01
IPC分类号： H05B37/02
CPC分类号： H05B33/0851 , H05B33/0815 , H05B33/083
摘要： A LED driver circuit avoids undesirable light generated by a LED due to leakage current by shunting the output terminal to the feedback terminal during periods when it is desired that the LED remain turned off. The shunting operation is achieved by providing a switch (e.g., a FET) that is connected between the output and feedback terminals of the LED, and is controlled by the user supplied reference signal. During active operation (i.e., when the user supplied reference signal is “enabled” and the LED is lit), the switch remains open, allowing the driver circuit to generate the desired driving voltage across the LED. During inactive periods (i.e., when the user supplied reference signal is “disabled” and the LED is intended to be off), the switch is closed, which couples the output and feedback terminals to generate an essentially zero voltage drop across the LED.
摘要翻译： 在期望LED保持关闭的时段期间，LED驱动器电路避免了由于泄漏电流而由LED产生的不期望的光，其通过将输出端分流到反馈端。 分流操作通过提供连接在LED的输出端和反馈端之间并由用户提供的参考信号控制的开关（例如，FET）来实现。 在有效操作期间（即，当用户提供的参考信号被“使能”并且LED被点亮时），开关保持断开，允许驱动电路在LED两端产生期望的驱动电压。 在非活动期间（即，当用户提供的参考信号被禁用并且LED旨在关闭时），开关闭合，其耦合输出和反馈端子以在LED两端产生基本为零的电压降。
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4.发明申请公开(公告)号：US20090085643A1
公开(公告)日：2009-04-02
申请号：US11864440
申请日：2007-09-28
IPC分类号： H03K17/296
CPC分类号： H02H9/025 , H02H1/04 , H02H7/0816 , Y10S323/908
摘要： A method for operating a current limit power switch for supplying power to a load include activating the power switch to start supplying power to the load; limiting the current drawn by the power switch to a first current limit for a first, fixed duration; after the first, fixed duration, limiting the current drawn by the power switch to a second current limit for a second duration where the second current limit is less than the first current limit; and after the second duration, limiting the current drawn by the power switch to a third current limit where the third current limit is less than the second current limit.
摘要翻译： 用于操作向负载供电的限流电源开关的方法包括启动电源开关以开始向负载供电; 将由电源开关汲取的电流限制为第一固定持续时间的第一电流限制; 在第一固定持续时间之后，将第二电流限制小于第一电流限制的第二持续时间限制由电源开关吸收的电流到第二电流限制; 并且在第二持续时间之后，将由电源开关汲取的电流限制到第三电流限制，其中第三电流限制小于第二电流限制。
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