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US08213203B2 Method and apparatus for controlling a constant current output in a switching mode power supply 有权
用于在开关模式电源中控制恒定电流输出的方法和装置

Method and apparatus for controlling a constant current output in a switching mode power supply
摘要：
A controller for providing a constant output current control signal in a switched mode power supply (SMPS) includes a conduction time compensation circuit that is configured to produce a compensated conduction time interval signal that includes compensation for a ringing waveform of a feedback signal. The compensated signal reflects more accurately the actual conductive time of a rectifying diode in a secondary winding of the switched mode power supply. In one embodiment, the compensated conduction time interval signal is used to generate a fixed ratio between the conduction time and the non-conduction time of the rectifying diode. In another embodiment, the controller also provides a constant voltage control signal.
摘要（中）：

用于在开关模式电源（SMPS）中提供恒定输出电流控制信号的控制器包括导通时间补偿电路，其被配置为产生补偿的导通时间间隔信号，该信号包括对反馈信号的振铃波形的补偿。 补偿信号更准确地反映了开关模式电源的次级绕组中整流二极管的实际导通时间。 在一个实施例中，补偿导通时间间隔信号用于产生整流二极管的导通时间和非导通时间之间的固定比率。 在另一实施例中，控制器还提供恒定电压控制信号。

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