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Defrosting apparatus with lumped inductive matching network and methods of operation thereof

An impedance matching network, inductance technology, applied in impedance network, multi-terminal pair network, dielectric heating and other directions, can solve problems such as low thawing efficiency of food load

Active Publication Date: 2018-02-13
NXP USA INC
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although good thawing results are possible with such systems, dynamic changes in food load impedance can lead to inefficient thawing of food loads
Furthermore, inaccuracies inherent in determining the duration of a thawing operation based on weight can lead to premature cessation of the thawing operation, or a late cessation after the food load has begun cooking

Method used

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  • Defrosting apparatus with lumped inductive matching network and methods of operation thereof
  • Defrosting apparatus with lumped inductive matching network and methods of operation thereof
  • Defrosting apparatus with lumped inductive matching network and methods of operation thereof

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Embodiment Construction

[0070] The following detailed description is merely illustrative in nature and is not intended to limit the subject matter embodiments or the application and uses of such embodiments. The words "exemplary" and "example" are used herein to mean "serving as an example, instance, or illustration." Any implementation described herein as illustrative or example should not necessarily be construed as preferred or advantageous over other implementations. Furthermore, there is no intention to be bound by any expressed or implied theory presented in the preceding technical field, background or the following detailed description.

[0071] Embodiments of the subject matter described herein relate to solid state thawing devices that may be incorporated into a single appliance or other systems. As described in more detail below, by using a first electrode disposed in the chamber, an amplifier device (comprising one or more transistors), an impedance matching network coupled between the ou...

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Abstract

The invention provides a defrosting system which includes an RF signal source, an electrode proximate to a cavity within which a load to be defrosted is positioned, a transmission path between the RFsignal source and the electrode, and an impedance matching network electrically coupled along the transmission path between the output of the RF signal source and the electrode. The system also includes power detection circuitry coupled to the transmission path and configured to detect reflected signal power along the transmission path. A system controller is configured to modify, based on the reflected signal power, an inductance value of the impedance matching network to reduce a ratio of the reflected signal power to the forward signal power. The impedance matching network includes a plurality of fixed-value, lumped inductors positioned within a fixed inductor area.

Description

technical field [0001] Embodiments of the subject matter described herein relate generally to apparatus and methods for thawing loads using radio frequency (RF) energy. Background technique [0002] Conventional capacitive food defrosting (or thawing) systems include large planar electrodes contained within a heating chamber. After placing the food load between the electrodes and bringing the electrodes into contact with the food load, low power electromagnetic energy is supplied to the electrodes to achieve slight heating of the food load. As the food load melts during the defrosting operation, the impedance of the food load changes. Therefore, the power delivery to the food load also changes during the defrosting operation. The duration of the defrosting operation may be determined, for example, based on the weight of the food load, and a timer may be used to control the stopping of the operation. [0003] While good thawing results are possible with such systems, dynam...

Claims

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Application Information

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IPC IPC(8): A23L3/365
CPCA23L3/365H05B6/62H03H7/40H05B6/688H05B6/705
Inventor 邱小飞詹姆斯·埃里克·斯科特利昂内尔·蒙然贾里米·西蒙皮埃里·马里·让·皮埃尔
Owner NXP USA INC
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