High-frequency heating device

Patent metadata

Field	Value
Publication number	US-9510396-B2
Application number	US-201314406058-A
Country	US
Kind code	B2
Filing date	Feb 28, 2013
Priority date	Jun 7, 2012
Publication date	Nov 29, 2016
Grant date	Nov 29, 2016

Abstract

A high-frequency heating device of the present invention includes at least one high-frequency power generating part, at least one high-frequency power unit including a quadrature modulation part and a high-frequency power amplification part, a radiation part, a modulation signal generating part, and a control part, and the control part supplies the modulation signal generating part with a plurality of pieces of subcarrier information respectively including pieces of information of offset frequencies and phases, generates an in-phase modulation signal and a quadrature modulation signal, performs quadrature modulation in the quadrature modulation part, and outputs a plurality of subcarrier waves.

First claim

What is claimed is:

1. A high-frequency heating device heating an object to be heated housed in a heating chamber comprising:
at least one high-frequency power generating part generating a high-frequency power of a set frequency;
at least one high-frequency power unit including a quadrature modulation part modulating a high-frequency power generated by the high-frequency power generating part with an input modulation signal, and a high-frequency power amplification part amplifying a high-frequency power modulated by the quadrature modulation part to an amplitude of power suitable for heating;
at least one radiation part radiating a high-frequency power output from the high-frequency power unit to the object to be heated;
a modulation signal generating part generating a modulation signal supplied to the quadrature modulation part based on input information of pluralities of frequencies and phases; and
a control part setting a reference frequency of a high-frequency power radiated from the radiation part in the high-frequency power generating part, the control part outputting information of individual frequencies and phases of a plurality of high-frequency powers radiated from the radiation part to the modulation signal generating part,
the control part supplying the modulation signal generating part with a plurality of pieces of subcarrier information respectively including pieces of information of offset frequencies and phases relative to the reference frequency for a plurality of high-frequency powers radiated from the radiation part,
the modulation signal generating part generating an in-phase modulation signal and a quadrature modulation signal based on the plurality of pieces of subcarrier information supplied from the control part, the modulation signal generating part outputting the in-phase modulation signal and the quadrature modulation signal to the quadrature modulation part,
the quadrature modulation part performing quadrature modulation of a high-frequency power input from the high-frequency power generating part with the in-phase modulation signal and the quadrature modulation signal input from the modulation signal generating part, the quadrature modulation part outputting a plurality of subcarrier waves of the offset frequencies and the phases relative to the reference frequency.

2. The high-frequency heating device of claim 1 , wherein the modulation signal generating part generates the in-phase modulation signal and the quadrature modulation signal by an inverse fast Fourier transform arithmetic process for the plurality of pieces of subcarrier information supplied from the control part and supplies the in-phase modulation signal and the quadrature modulation signal to the modulation signal generating part.

3. The high-frequency heating device of claim 2 , wherein the control part further has a subcarrier information storage part storing a plurality of predefined pieces of the subcarrier information, takes out a plurality of suitable pieces of the subcarrier information from the subcarrier information storage part when performing the heating, sets the reference frequency in the high-frequency power generating part, and outputs the subcarrier information to the modulation signal generating part.

4. The high-frequency heating device of claim 3 , wherein the control part determines the reference frequency such that a maximum value of absolute values of the offset frequencies relative to the reference frequency is minimized in the plurality of the subcarrier waves, and sets the frequency in the high-frequency power generating part.

5. The high-frequency heating device of claim 4 , wherein
the high-frequency power unit further includes a power detection unit, wherein
the power detection unit detects an output power sent out from the high-frequency power amplification part to the radiation part and/or a backflow power flowing back from the radiation part to the high-frequency power amplification part, and wherein
the control unit determines the subcarrier information supplied to the modulation signal generating part and the reference frequency set in the high-frequency power generating part by using detection information of the output power and/or the backflow power detected by the power detection unit.

6. The high-frequency heating device of claim 4 , wherein
the high-frequency power unit further includes a power detection unit, wherein
the power detection unit detects an output power sent out from the high-frequency power amplification part to the radiation part and/or a backflow power flowing back from the radiation part to the high-frequency power amplification part, wherein
the control unit determines the subcarrier information supplied to the modulation signal generating part and the reference frequency set in the high-frequency power generating part by using detection information of the output power and/or the backflow power detected by the power detection unit, wherein
the power detection part has a quadrature detection part, wherein
the quadrature detection part detects an in-phase detection signal and a quadrature detection signal for demodulating the output power or the backflow power by performing quadrature detection of the output power or the backflow power by using the high-frequency power generated in the high-frequency power generating part, wherein
the control part further has a demodulation part, wherein
the demodulation part acquires offset frequency and phase information of individual subcarriers by applying a fast Fourier transform arithmetic process to the in-phase detection signal and the quadrature detection signal detected by the quadrature detection part to acquire offset frequency and phase information of individual subcarriers, and wherein the control part determines the subcarrier information supplied to the modulation signal generating part and the reference frequency set in the high-frequency power generating part by using the offset frequency and phase information of individual subcarriers acquired by the demodulation part.

7. The high-frequency heating device of claim 3 , wherein
the high-frequency power unit further includes a power detection unit, wherein
the power detection unit detects an output power sent out from the high-frequency power amplification part to the radiation part and/or a backflow power flowing back from the radiation part to the high-frequency power amplification part, and wherein
the control unit determines the subcarrier information supplied to the modulation signal generating part and the reference frequency set in the high-frequency power generating part by using detection information of the output power and/or the backflow power detected by the power detection unit.

8. The high-frequency heating device of claim 3 , wherein
the high-frequency power unit further includes a power detection unit, wherein
the power detection unit detects an output power sent out from the high-frequency power amplification part to the radiation part and/or a backflow power flowing back from the radiation part to the high-frequency power amplification part, wherein
the control unit determines the subcarrier information supplied to the modulation signal generating part and the reference frequency set in the high-frequency power generating part by using detection information of the output power and/or the backflow power detected by the power detection unit, wherein
the power detection part has a quadrature detection part, wherein
the quadrature detection part detects an in-phase detection signal and a quadrature detection signal for demodulating the output power or the backflow power by performing quadrature detection of the output power or the backflow power by using the high-frequency powe

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Okajima Toshiyuki

Classifications

• Y02B40/146

  Cross-Sectional Technologies · mapped topic

• H05B6/705

  using microwave tuning · CPC title

• Y02B40/143

  Cross-Sectional Technologies · mapped topic

• H05B6/70

  Feed lines · CPC title

• H05B6/686 Primary

  Circuits comprising a signal generator and power amplifier, e.g. using solid state oscillators · CPC title