公开(公告)号：US20120133348A1

公开(公告)日：2012-05-31

申请号：US13307644

申请日：2011-11-30

Applicant: Po-Chin FAN ,  Kuo-Ping LIU

Inventor： Po-Chin FAN ,  Kuo-Ping LIU

IPC: G05F1/10

CPC classification number: H02M3/1588 ,  H02M2001/0025 ,  H02M2001/0032 ,  Y02B70/1466 ,  Y02B70/16

Abstract: When the switching frequency of a constant on-time power converter decreases to a threshold, the power converter is switched from the original operation of triggering a constant on-time of a high-side switch responsive to the output voltage of the power converter reaching a valley point to the operation of triggering a constant off-time of the high-side switch responsive to the output voltage reaching a peak point, to thereby prevent the power converter from operating in an audio frequency range.

Abstract translation: 当恒定导通时间功率转换器的开关频率降低到阈值时，响应于功率转换器的输出电压到达高功率转换器的输出电压，功率转换器从原始操作切换到触发高侧开关的恒定导通时间 谷指向响应于输出电压达到峰值点的高侧开关的恒定关断时间的操作，从而防止功率转换器在音频范围内工作。