公开(公告)号：US11039511B2

公开(公告)日：2021-06-15

申请号：US16230425

申请日：2018-12-21

Applicant: NXP USA, Inc.

Inventor： James Eric Scott ,  Nicholas Justin Mountford Spence ,  Hung Hoa Tran

IPC: H05B6/68 ,  H05B6/66 ,  H05B6/64 ,  H03H7/40 ,  H05B6/50 ,  H05B6/54 ,  H05B6/62

Abstract: A defrosting system includes an RF signal source, one or more electrodes, a transmission path between the RF signal source and the electrode(s), and an impedance matching network coupled along the transmission path. A system controller may modify the impedance matching network to reduce the reflected signal power. The system controller may determine an initial estimate of the mass of the load. Desired signal parameters for the RF signal may be determined based on the initial estimated mass of the load. The system controller may determine a refined estimate of the load mass based on a rate of change of an S11, VSWR, or reflected power parameter measured at the transmission path, or based on elapsed time between matches. Refined signal parameters for the RF signal may be determined based on the refined estimated mass.

公开(公告)号：US11723121B2

公开(公告)日：2023-08-08

申请号：US16131606

申请日：2018-09-14

Applicant: NXP USA, Inc.

Inventor： Jamison Michael McCarville ,  Lionel Mongin ,  Pierre Marie Jean Piel ,  Hung Hoa Tran

IPC: H05B6/06 ,  H05B6/68 ,  H05B6/62 ,  H05B6/64 ,  H05B6/66

CPC classification number: H05B6/688 ,  H05B6/62 ,  H05B6/645 ,  H05B6/6467 ,  H05B6/664

Abstract: A system includes a radio frequency (RF) signal source configured to supply an RF signal. An electrode is coupled to the RF signal source and a transmission path is between the RF signal source and the electrode. The transmission path is configured to convey the RF signal from the RF signal source to the electrode to cause the electrode to radiate RF electromagnetic energy into a cavity. Power detection circuitry is coupled to the transmission path and configured to repeatedly measure RF power values including at least one of forward RF power values and reflected RF power values along the transmission path. A controller is configured to determine that a load in the cavity is a low-loss load based on a rate of change of the RF power values, and cause the RF signal source to supply the RF signal with the one or more desired signal parameters.

公开(公告)号：US11484048B2

公开(公告)日：2022-11-01

申请号：US16172650

申请日：2018-10-26

Applicant: NXP USA, Inc.

Inventor： Hung Hoa Tran ,  Pierre Marie Jean Piel ,  Lionel Mongin ,  Jamison Michael McCarville

IPC: H05B6/06 ,  H05B6/68 ,  A23L3/005 ,  H05B6/12 ,  H05B6/72

Abstract: A system and method for defrosting a load are presented. Radio frequency (RF) signals are supplied to a transmission path that is electrically coupled to one or more electrodes that are positioned proximate to a cavity to cause the one or more electrodes to radiate RF electromagnetic energy. An RF power value of the RF signal along the transmission path is periodically measured resulting in RF power values and a rate of change of the RF power values is determined. A low-loss indicator value is determined using the RF power values, wherein the low-loss indicator value is at least partially determined by a dielectric loss of a load in the cavity. A controller determines, using the rate of change of the RF power values and the low-loss indicator value, that the load is in a defrosted state and stops supplying the RF signals.

公开(公告)号：US20200170081A1

公开(公告)日：2020-05-28

申请号：US16773619

申请日：2020-01-27

Applicant: NXP USA, Inc.

Inventor： Jamison Michael McCarville ,  Hung Hoa Tran ,  Gavin James Smith ,  Lionel Mongin

IPC: H05B6/62 ,  H05B6/50 ,  H05B11/00 ,  H05B3/00 ,  H05B6/68 ,  H05B6/54 ,  A47J36/32 ,  A47J27/00

Abstract: A system includes a cavity configured to receive a container. The container is configured to contain a plurality of grains. The system includes a radio frequency (RF) signal source configured to supply an RF signal, an impedance matching network electrically coupled to an output of the RF signal source, a transmission path coupled to the impedance matching network, and a first electrode in the cavity. The first electrode is coupled to the transmission path and configured to radiate electromagnetic energy into the cavity as a result of receiving the RF signal. The system includes power detection circuitry configured to measure a magnitude of a reflected signal along the transmission path and a controller configured to modify an impedance transformation performed by the impedance matching network based on the magnitude of the reflected signal.