公开(公告)号：US20200090861A1

公开(公告)日：2020-03-19

申请号：US16130899

申请日：2018-09-13

Applicant: Analog Devices Global Unlimited Company

Inventor： Liuqing YANG ,  Jian YE ,  Zhijie ZHU

IPC: H01F27/40 ,  H02M1/40 ,  H02M7/06 ,  H02M3/335

Abstract: The subject disclosure provides for utilizing pulse width modulation (PWM) signaling to influence a closed loop of a shunt boost controller and reduce an imbalance of a load. The imbalance reduction helps reduce remanence of a current transformer (CT) and thereby prevent saturation of the CT. A shunt boost controller provides the control signal to control flow of current to the load. A feedback network provides a feedback signal to the shunt boost controller based on a direct current (DC) voltage and causes a power switch circuit to turn on when a magnitude of the feedback signal exceeds a threshold magnitude. The PWM generator supplies a PWM signal to cause the control signal to be provided more symmetrical to the power switch circuit and causes the power switch circuit to turn on more frequently with the control signal to reduce the imbalance of the load.