Method and apparatus for fault detection in a switching power supply

开关式电源中故障检测的方法和装置及用于电源的控制器

Abstract

Techniques are disclosed to detect a fault in the feedback circuit of a switching power supply while the power supply operates in a mode where the output is below its regulated value. The power supply delivers maximum power at a given switching frequency without a feedback signal while the output is below its regulated value. A fault protection circuit substantially reduces the average output power if there is no feedback signal for the duration of a fault time. When there is no feedback signal, the power supply increases the maximum output power by increasing the switching frequency before the end of the fault time to increase the output to a regulated value. The presence of a feedback signal when the output reaches a regulated value restores the original switching frequency and returns the output to its unregulated value. The absence of a feedback signal at the end of the fault time engages the fault protection circuit to substantially reduce the output power.
本发明公开了一种检测开关式电源中反馈电路故障的技术,此时电源运行在一种输出低于调节值的模式。电源在没有反馈信号时传送给定的开关频率下的最大功率,同时输出低于调节值。如果没有反馈信号的时间持续达到故障时间,故障保护电路充分地减少平均输出功率。当没有反馈信号时,电源通过在故障时间结束之前增加开关频率来增加最大输出功率,以使输出增加到调节值。当输出达到调节值时,反馈信号的存在恢复原始的开关频率并使输出返回到未调节值。在故障时间结束时,反馈信号的缺失使故障保护电路充分地减少输出功率。

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