公开(公告)号：US09692314B2

公开(公告)日：2017-06-27

申请号：US15072504

申请日：2016-03-17

Applicant: LITE-ON TECHNOLOGY CORP.

Inventor： Yen-Shin Lai ,  Pane-You Liu

IPC: H02M5/458 ,  G01R31/42 ,  H02M1/32 ,  H02J3/36 ,  H02M7/06

CPC classification number: H02M5/458 ,  G01R31/42 ,  H02M1/32 ,  H02M7/062

Abstract: A detection circuit for an AC-to-AC power converter includes a voltage divider circuit that has three AC input terminal coupled respectively to three input ends of a power converter which are to receive respectively three AC input power signals with different phases, and that receives a predetermined first reference voltage. Upon receiving one AC input power signal, the voltage divider circuit outputs a divided voltage, which during an active period of the one AC input power signal, is greater than a predetermined second reference voltage, to a comparator, which also receives the predetermined second reference voltage, such that the comparator outputs a detection signal that is in an active state when the one AC input power signal is.