公开(公告)号：US20230283195A1

公开(公告)日：2023-09-07

申请号：US18116137

申请日：2023-03-01

Applicant: WHIRLPOOL CORPORATION

Inventor： Salvatore Baldo ,  Andrea Gallivanoni ,  Cristiano Vito Pastore ,  Andrea Zoppi

IPC: H02M7/217 ,  H05B6/12

CPC classification number: H02M7/217 ,  H05B6/1209 ,  H02M1/44

Abstract: A ticking noise that can be heard when the QR converter is operated to deliver a power level smaller than the minimum power level for having a soft-switching can be due to the fact that during the OFF interval there is no power delivery and the DC-bus capacitance is charged at the peak of rectified main line voltage. This drawback may be overcome by discharging purposely the DC-bus capacitor during an OFF interval of the QR converter until the DC-bus capacitor is substantially discharged when a new ON interval of the QR converter is started.

公开(公告)号：US20230283193A1

公开(公告)日：2023-09-07

申请号：US18116015

申请日：2023-03-01

Applicant: WHIRLPOOL CORPORATION

Inventor： Salvatore Baldo ,  Andrea Gallivanoni ,  Cristiano Vito Pastore ,  Andrea Zoppi

IPC: H02M7/04 ,  H02M7/219 ,  H02M1/00 ,  H05B6/12

CPC classification number: H02M7/05 ,  H02M7/219 ,  H02M1/0058 ,  H05B6/1236

Abstract: A switching converter, such as for an induction cooktop, that can be operated to deliver a power level smaller than the minimum power level for having a soft-switching. Input AC terminals are disconnected from the DC-bus capacitor to prevent it from being charged, so that the DC voltage exhibited by the DC-bus is null or smaller than a minimum nominal value when a next ON time interval T1 begins. The switching converter helps prevent ticking noise.