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2. 发明申请

US20060176716A1 Method and apparatus for maintaining a constant load current with line voltage in a switch mode power supply 有权
标题翻译：用于在开关模式电源中用线电压维持恒定负载电流的方法和装置
公开(公告)号：US20060176716A1
公开(公告)日：2006-08-10
申请号：US11397524
申请日：2006-04-03
申请人： Balu Balakrishnan , Alex Djenguerian , Kent Wong , David Michael Matthews
发明人： Balu Balakrishnan , Alex Djenguerian , Kent Wong , David Michael Matthews
IPC分类号： H02M3/335
CPC分类号： H02M3/33523 , H02M3/33507 , H02M2001/0009 , H03K17/0822
摘要： A power supply including a regulation circuit that maintains an approximately constant load current with line voltage. An example circuit includes a switch including first, second and third terminals. The first terminal is coupled or decoupled to the second terminal in response to a control signal received at the third terminal. Voltage sense circuitry is included and is coupled to sense a voltage drop across the switch. The voltage drop is representative of a current in the switch during an on time of the switch. The voltage sense circuitry has a variable current limit threshold that increases between a first level and a second level during the on time of the switch. The control signal is responsive to the variable current limit threshold to regulate a power supply with an output characteristic having an approximately constant output voltage below an output current threshold and an approximately constant output current below an output voltage threshold.
摘要翻译：一种电源，包括一个调节电路，该电路用线路电压保持大致恒定的负载电流。示例电路包括包括第一，第二和第三端子的开关。响应于在第三终端处接收到的控制信号，第一终端被耦合或去耦到第二终端。包括电压检测电路，并耦合以感测开关两端的电压降。电压降在开关导通时代表开关中的电流。电压检测电路具有可变电流限制阈值，其在开关导通时间在第一电平和第二电平之间增加。控制信号响应于可变电流限制阈值，以具有输出特性的输出特性来调节电源，输出特性具有低于输出电流阈值的近似恒定的输出电压和低于输出电压阈值的近似恒定的输出电流。

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