# US 9,040,879 B2 · RF heating at selected power supply protocols

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- Number: US 9,040,879 B2
- Document ID: US9040879B2
- Status: Granted
- Kind: B2
- Application number: 13/759,142
- Filed: 2013-02-05
- Published: 2013-08-08
- Granted: 2015-05-26
- Earliest claimed: 2012-02-06
- Assignees: Goji Limited
- Applicants: Avner Libman; Steven Robert Rogers; Caroline Myriam Rachel Obadia
- Inventors: Avner Libman; Steven Robert Rogers; Caroline Myriam Rachel Obadia
- Web page: https://patentgrep.com/patent/US9040879B2

## CPC

- H05B 6/6402: {Aspects relating to the microwave cavity}
- H05B 1/02: Automatic switching arrangements specially adapted to apparatus {; Control of heating devices} (thermally-actuated switches H01H37/00)
- H05B 6/00: Heating by electric, magnetic or electromagnetic fields
- H05B 6/68: for monitoring or control
- H05B 6/686: {Circuits comprising a signal generator and power amplifier, e.g. using solid state oscillators}
- H05B 6/70: Feed lines
- H05B 6/705: {using microwave tuning}
- H05B 6/72: Radiators or antennas
- Y02B 40/00: Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

Disclosed is an apparatus for applying RF energy to an object in an energy application zone via one or more radiating elements at a plurality of modulation space elements (MSEs). The apparatus may include at least one processor configured to cause supply of RF energy to one or more of the radiating elements in a first subset of the plurality of MSEs, at a first power level common to the MSEs in the first subset and for varying time durations, and cause supply of RF energy to one or more of the radiating elements in a second subset of the plurality of MSEs, at power levels lower than the first power level and for a time duration common to the MSEs of the second subset.

## Claims

### Claim 1

An apparatus for applying RF energy to an object in an energy application zone via one or more antennas at a plurality of modulation space elements (MSEs), the apparatus comprising:
a detector configured to detect an electromagnetic response of the energy application zone to the applied RF energy, and send feedback signals indicative of the electromagnetic response;
at least one processor configured to:
receive feedback signals sent from the detector, and based on the feedback signals:
cause supply of RF energy to one or more of the antennas in a first subset of the plurality of MSEs, at a first power level common to the MSEs in the first subset and for varying time durations; and
cause supply of RF energy to one or more of the antennas in a second subset of the plurality of MSEs, at power levels lower than the first power level and for a time duration common to the MSEs of the second subset.

### Claim 2 (depends on 1)

The apparatus of claim 1, wherein each of the varying time durations is not shorter than the time duration common to the MSEs of the second subset of MSEs.

### Claim 3 (depends on 1)

The apparatus of claim 1, wherein each MSE is associated with an absorbability indicator, and the absorbability indicators associated with the MSEs of the first subset of MSEs are different from the absorbability indicators associated with MSEs of the second subset of MSEs.

### Claim 4 (depends on 1)

The apparatus of claim 1, wherein the at least one processor is configured to associate MSEs with absorbability indicators, and group the MSEs into the first subset and the second subset based on the absorbability indicators associated with the MSEs.

### Claim 5 (depends on 3)

The apparatus of claim 3, wherein the detector is configured to detect power exiting from the energy application zone, and determine an absorbability indicator for each of the MSEs based on readings of the detector.

### Claim 6

A method of applying RF energy to an object in an energy application zone via one or more antennas at a plurality of modulation space elements (MSEs), the method comprising:
causing supply of RF energy to one or more of the antennas in a first subset of the plurality of MSEs, at a first power level common to the MSEs in the first subset and for varying time durations; and
causing supply of RF energy to one or more of the antennas in a second subset of the plurality of MSEs, at power levels lower than the first power level and for a time duration common to the MSEs of the second subset of the plurality of MSEs.

### Claim 7 (depends on 6)

The method of claim 6, wherein each of the varying time durations is not shorter than the time duration common to the MSEs of the second subset of MSEs.

### Claim 8 (depends on 6)

The method of claim 6, further comprising grouping the MSEs into the first and second subsets of MSEs based on absorbability indicators associated with the MSEs.

### Claim 9 (depends on 6)

The method of claim 6, further comprising:
associating the MSEs with absorbability indicators; and
grouping the MSEs into the first subset and the second subset based on the absorbability indicators associated with the MSEs.

### Claim 10 (depends on 6)

The method of claim 6, further comprising:
receiving from a detector readings of power exiting from the energy application zone; and
determining an absorbability indicator for each of the MSEs based on received readings of the power exiting from the energy application zone.

### Claim 11

An apparatus for applying RF energy to an object in an energy application zone via one or more antennas at a plurality of modulation space elements (MSEs), the apparatus comprising;
a detector, configured to detect an electromagnetic response of the energy application zone to the applied RF energy, and send feedback signals indicative of the electromagnetic response; and
at least one processor configured to:
receive feedback signals sent from the detector, and based on the feedback signals:
cause supply of RF energy to one or more of the antennas in a first subset of the plurality of MSEs, at a first power level common to the plurality of MSEs in the first subset and for a first time duration common to the MSEs of the first subset; and
cause supply of RF energy to one or more of the antennas in a second subset of the plurality of MSEs, at a second power level common to the plurality of MSEs in the second subset and for a second time duration common to the MSEs of the second subset,
wherein the first power level is higher than the second power level and the first time duration is shorter than the second time duration.

### Claim 12 (depends on 11)

The apparatus of claim 11, wherein each of the MSEs is associated with an absorbability indicator, and the absorbability indicators associated with the MSEs of the first subset of MSEs are different from the absorbability indicators associated with the MSEs of the second subset of MSEs.

### Claim 13 (depends on 11)

The apparatus of claim 11, wherein absorbability indicators associated with the MSEs of the first subset are lower than absorbability indicators associated with the MSEs of the second subset.

### Claim 14 (depends on 11)

The apparatus of claim 11, wherein the at least one processor is configured to associate the MSEs with absorbability indicators, and group the MSEs into the first subset and the second subset based on the absorbability indicators associated with the MSEs.

### Claim 15 (depends on 11)

The apparatus of claim 11, wherein the detector is configured to detect power exiting from the energy application zone, and determine an absorbability indicator for each of the MSEs based on readings of the detector.