WO2017217438A1 - Dispositif d'oscillation à ondes électromagnétiques - Google Patents

Dispositif d'oscillation à ondes électromagnétiques Download PDF

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Publication number
WO2017217438A1
WO2017217438A1 PCT/JP2017/021887 JP2017021887W WO2017217438A1 WO 2017217438 A1 WO2017217438 A1 WO 2017217438A1 JP 2017021887 W JP2017021887 W JP 2017021887W WO 2017217438 A1 WO2017217438 A1 WO 2017217438A1
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WO
WIPO (PCT)
Prior art keywords
electromagnetic wave
oscillator
electromagnetic
detector
wave oscillator
Prior art date
Application number
PCT/JP2017/021887
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English (en)
Japanese (ja)
Inventor
池田　裕二
誠士 神原
Original Assignee
イマジニアリング株式会社
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Filing date
Publication date
Application filed by イマジニアリング株式会社 filed Critical イマジニアリング株式会社
Priority to JP2018523950A priority Critical patent/JP6944666B2/ja
Publication of WO2017217438A1 publication Critical patent/WO2017217438A1/fr

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/66—Circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/66—Circuits
    • H05B6/68—Circuits for monitoring or control
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/46—Generating plasma using applied electromagnetic fields, e.g. high frequency or microwave energy

Definitions

  • the present invention relates to an electromagnetic wave oscillation device that supplies electromagnetic wave energy from an electromagnetic wave irradiation antenna to an electromagnetic wave heating device or a catalyst carrier having an electromagnetic wave absorber or supplies electromagnetic wave energy to an ignition device that boosts and discharges the electromagnetic wave. .
  • Patent Document 1 discloses a microwave heating apparatus in which an electromagnetic wave irradiation antenna that radiates microwaves is provided on the upper, lower, left, and right wall surfaces of a heating chamber.
  • This microwave heating apparatus has two oscillators, and the microwave output from the first oscillator is divided into two by the first distributor, fed to the antennas on the upper surface and the lower surface, and output from the second oscillator.
  • the microwaves are divided into two by the second distributor and fed to the left and right antennas.
  • an oscillator electromagnetic wave oscillation device
  • a converter including a rectifier circuit that rectifies from a commercial AC power source or a DC power source such as a battery, and a smoothing capacitor.
  • the electromagnetic wave is disposed in front of the electromagnetic wave oscillator and the cavity for supplying the electromagnetic wave energy.
  • measures are taken such as stopping the oscillator when the reflected wave increases.
  • the present invention has been made in view of the above points, and its purpose is not to simply stop the electromagnetic wave oscillator when the reflected wave increases, but to damage the device due to the reflected wave without reducing the efficiency of the entire apparatus. It is providing the electromagnetic wave oscillating device which can suppress.
  • the electromagnetic wave oscillation device of the present invention made to solve the above problems is An electromagnetic wave oscillator that oscillates an electromagnetic wave by a voltage applied from a power supply; A detector that detects a traveling wave and a reflected wave of an electromagnetic wave oscillated from the electromagnetic wave oscillator between the electromagnetic wave oscillator and a cavity that receives supply of electromagnetic wave energy from the electromagnetic wave oscillator; A controller for controlling the electromagnetic wave oscillator and the detector, The control device oscillates by changing the frequency of the oscillating electromagnetic wave when the voltage standing wave ratio detected by the detector becomes a predetermined value or more.
  • the electromagnetic wave oscillating device of the present invention determines that the reflected wave has increased when the voltage standing wave ratio for detecting the traveling wave and the reflected wave of the electromagnetic wave oscillated from the electromagnetic wave oscillator exceeds a predetermined value, for example, 4.
  • the electromagnetic wave oscillated from the oscillator is controlled so as to reduce the voltage standing wave ratio by changing the frequency of the electromagnetic wave.
  • VSWR (1+
  • Z 0 Line characteristic impedance
  • Z Load impedance
  • V 1 Amplitude voltage of traveling wave
  • V 2 Numerical value indicating the relationship between traveling wave and reflected wave expressed by amplitude voltage of reflected wave It is.
  • control device has a voltage standing wave ratio detected by the detector equal to or greater than a predetermined value, and the phase of the oscillating electromagnetic wave is 0.1 ⁇ -0. Oscillation can be performed by varying the frequency of the electromagnetic wave that oscillates when in the range of 35 ⁇ .
  • the electromagnetic wave oscillation device of the present invention can maintain the voltage standing wave ratio appropriately by changing the frequency of the electromagnetic wave oscillated from the electromagnetic wave oscillator, and can prevent the electromagnetic wave oscillator from being damaged by the reflection of the electromagnetic wave. Can be provided.
  • Embodiment 1 is an electromagnetic wave oscillation device according to the present invention.
  • the electromagnetic wave oscillation device 1 includes a converter 2 that converts a voltage from a power source P into a DC voltage, and an electromagnetic wave oscillator 3 that pulsates an electromagnetic wave using a DC voltage applied from the converter 2.
  • a detector 8 that detects a traveling wave and a reflected wave of an electromagnetic wave oscillated from the electromagnetic wave oscillator 3 between the cavity C that receives the supply of electromagnetic wave energy from the electromagnetic wave oscillator 3 and the electromagnetic wave oscillator 3, and a detection from the detector 8
  • a control device 5 that controls the electromagnetic wave oscillator 3 while applying a signal.
  • control apparatus 5 is controlled so that it oscillates by changing the frequency of the electromagnetic wave to oscillate, when the voltage standing wave ratio which the detector 8 detects becomes more than predetermined value.
  • the electromagnetic wave oscillated from the electromagnetic wave oscillator 3 is amplified to a desired output by the amplifier 4 and supplied to the electromagnetic wave irradiation antenna 7 through the distributor 6.
  • the distributor 6 is controlled by the control device 5.
  • the supply of current to the electromagnetic wave oscillator 3 is supplied from the converter 2 through the smoothing circuit 30 and a low voltage, for example, 5V or 12V, is supplied to the amplifier 4 depending on the amplification rate of the electromagnetic wave from the electromagnetic wave oscillator 3. For example, a voltage of 32V is applied.
  • the control device 5 controls the converter 2 in accordance with the oscillation pattern of the electromagnetic wave oscillator 3 described later to change the output pattern. It doesn't matter.
  • the converter 2 uses an AC / DC converter when a household AC power source is used, and a DC / DC converter when a DC power source such as a battery is used.
  • the electromagnetic wave oscillator 3 receives an electromagnetic wave (for example, a pulse wave having a predetermined duty ratio, pulse time, or the like set from the control chip 50 or a continuous wave. 2.45 GHz microwave).
  • an electromagnetic wave for example, a pulse wave having a predetermined duty ratio, pulse time, or the like set from the control chip 50 or a continuous wave. 2.45 GHz microwave.
  • the amplifier 4 amplifies the electromagnetic wave of about several W output from the electromagnetic wave oscillator 3 to several kW, and supplies it to the ignition device and the electromagnetic wave irradiation antenna.
  • the cavity C corresponds to a heating chamber when the supply destination of electromagnetic wave energy is a heating device such as a microwave oven, and corresponds to a combustion chamber when the supply destination of electromagnetic wave energy is an internal combustion engine.
  • the detector 8 is configured to detect the impedance of the line. For example, when oscillating at 50 ⁇ (traveling wave), the impedance of the line ( When the load impedance is 100 ⁇ , the voltage reflection coefficient is 1/3 and the VSWR is 2. If the impedance of the line remains 50 ⁇ , the voltage reflection coefficient is 0 and VSWR is 1.
  • the signal from the detector 8 can be represented as a load fluctuation locus L on the Smith chart shown in FIG.
  • VSWR does not exceed a predetermined value, for example, 4 (inside the broken line circle and the voltage reflection coefficient is ⁇ 0.6), and from the electromagnetic wave oscillator 3 for a predetermined period, for a predetermined period.
  • An electromagnetic wave is oscillated as a pulse wave in which a ratio, a pulse time, etc. are set or as a continuous wave.
  • the control device 5 varies the frequency with respect to the electromagnetic wave oscillator 3.
  • the frequency set at 2.45 GHz is swept in 0.01 GHz units or 0.05 GHz units and adjusted so that the load fluctuation locus L does not exceed a predetermined value.
  • the electromagnetic wave energy is supplied to an electromagnetic wave heating device (for example, a microwave oven) or the like
  • the VSWR is predetermined by stopping the oscillation of the electromagnetic wave for a predetermined time and restarting the oscillation again for a predetermined time before the frequency change. It is also possible not to exceed the value. In this case, after one or more stops, when the VSWR exceeds a predetermined value, the frequency is controlled to vary.
  • the predetermined value of VSWR differs depending on the output of the oscillating electromagnetic wave and the shape of the cavity C, and the fluctuation of the oscillation frequency is set to 10 when the output of the electromagnetic wave is small, in addition to setting VSWR at 4 or more. Can also be operated.
  • the electromagnetic wave oscillating device 1 of this modified example is 0.1 ⁇ when the wavelength of the oscillating electromagnetic wave shown in FIGS. 4 to 5 is ⁇ even when the value of VSWR calculated by the detected value exceeds a predetermined value. Outside of the range of ⁇ 0.35 ⁇ , the frequency is not changed. Specifically, as shown in FIG. 4, the load fluctuation is within a cross-hatching range where the wavelength of the electromagnetic wave that oscillates exceeds the predetermined value (4 in the example) and is in the range of 0.1 ⁇ to 0.35 ⁇ .
  • the control device 5 changes the frequency with respect to the electromagnetic wave oscillator 3.
  • the frequency is varied only within the range of 0.1 ⁇ to 0.35 ⁇ in which damage to the device due to the reflected wave increases due to the phase of the electromagnetic wave.
  • an electromagnetic wave heating device for example, a microwave oven
  • the oscillation of the electromagnetic wave is stopped for a predetermined time and the oscillation is resumed before the frequency changes.
  • the frequency is controlled to vary.
  • the control is performed so that the normal operation is continued when the electromagnetic wave phase is such that the device is not destroyed by the reflected wave, thereby improving the efficiency of the entire apparatus. be able to.
  • an electromagnetic wave heating apparatus when a semiconductor is used for an electromagnetic wave oscillator, it is possible to optimally cook according to foods to be heated using a plurality of electromagnetic wave irradiation antennas.
  • the electromagnetic wave oscillation device of the present invention the voltage standing wave ratio (VSWR) is calculated by detecting the line impedance, and when it becomes a predetermined value or more, the new frequency is changed to change the reflected wave device. Can be effectively prevented.
  • VSWR voltage standing wave ratio
  • the second embodiment relates to an exhaust emission control device 10 using an electromagnetic wave oscillation device according to the present invention.
  • the exhaust gas purification apparatus 10 purifies exhaust gas discharged from an internal combustion engine, for example, an automobile engine.
  • the exhaust gas purification apparatus 10 supports a carrier 60 that supports a catalyst provided in an exhaust passage 51 of the internal combustion engine 22 and an exhaust gas upstream of the carrier 60.
  • An electromagnetic wave absorber 70 applied to the side end face 60 a and an electromagnetic wave irradiation antenna 7 that radiates electromagnetic waves to the space upstream of the exhaust of the carrier 60 are provided.
  • the electromagnetic wave irradiation antenna 7 constitutes an electromagnetic wave radiation device 9 by being combined with the electromagnetic wave oscillation device 1.
  • the electromagnetic wave oscillation device 1 is electrically connected to the power source P.
  • the electromagnetic wave irradiation antenna 7 can be a flat antenna disposed on the surface of the exhaust pipe forming the exhaust passage 51 as shown in FIG.
  • the space upstream of the carrier 60 in the exhaust passage 51 is a cavity C.
  • the electromagnetic wave absorber 70 can be configured by mixing a microcoil whose main component is a carbon atom or a molecule containing carbon with a heat-resistant powder material.
  • a microcoil more specifically, a carbon microcoil, as the electromagnetic wave absorber 70, the characteristic that the carbon microcoil absorbs electromagnetic waves and generates heat in a short time is used.
  • the electromagnetic wave absorber 70 By absorbing the microwave, the electromagnetic wave absorber 70 generates heat, and the carrier carrying the catalyst is heated in a short time.
  • the carbon microcoil includes a carbon nanocoil having a smaller wire diameter than the carbon microcoil.
  • the catalyst is an active metal (platinum, palladium, rhodium) which is a main component of the three-way catalyst system.
  • the three-way catalyst system purifies hydrocarbons (HC), carbon monoxide (CO), and nitrogen oxides (NO x ) contained in the exhaust gas of automobiles using gasoline as fuel.
  • Three-way catalysts oxidize hydrocarbons to water and carbon dioxide, carbon monoxide to carbon dioxide, and reduce nitrogen oxides to nitrogen.
  • the three-way catalyst system has a low reducing ability at room temperature, and almost no reducing ability immediately after the engine is started in a cold state. Therefore, in order to properly operate the three-way catalyst system when the engine is started, it is necessary to heat the catalyst to an appropriate temperature at which the catalyst is activated. In the present embodiment, the exhaust purification device 10 immediately heats the carrier 60 carrying the catalyst to activate the catalyst.
  • the carrier 60 carrying the catalyst is set to have an outer diameter that is substantially the same as the inner diameter of the holding portion of the carrier 60 of the casing 50 that forms the exhaust gas passage. ) In the casing 50.
  • the material of the carrier 60 is not particularly limited.
  • the carrier 60 is composed of a honeycomb ceramic structure.
  • the honeycomb structure is a member having a cylindrical outer shape made of an insulating material that can transmit microwaves.
  • the honeycomb structure includes a lattice portion having a cross-sectional lattice shape.
  • the honeycomb structure is configured such that the exhaust gas can flow in the direction indicated by the arrow in FIG. 6 through the gaps between the lattice portions.
  • the casing 50 is a substantially cylindrical metal member (so-called muffler) provided to accommodate the carrier 60.
  • the casing 50 constitutes a part of an exhaust pipe of an automobile engine, and the inside of the casing 50 constitutes an exhaust gas passage through which exhaust gas flows.
  • a method of applying the electromagnetic wave absorber 70 to the end face of the carrier 60 will be described.
  • Application in this specification means general application using a brush on the target surface of an object to be coated (carrier 60 in the present embodiment) on an object to be coated (electromagnetic wave absorber 70 in the present embodiment).
  • various methods such as application using a spray gun, and dipping and adhering the coating in a container containing the coating.
  • the microcoil used as the electromagnetic wave absorber 70 is constituted by a so-called carbon microcoil (hereinafter referred to as CMC) mainly composed of carbon atoms.
  • CMC is a fine carbon fiber having a shape wound in a coil shape at a pitch of about 0.01 to 1 ⁇ m.
  • CMC ceramic powder slurry and stirred to uniformly disperse the slurry (hereinafter referred to as “CMC”).
  • CMC slurry a ceramic powder slurry and stirred to uniformly disperse the slurry
  • CMC slurry the slurry
  • it can be formed by forming a slurry solution in which a ceramic binder and a microcoil are mixed, applying this to the surface of the end face of the carrier 60, and firing together with the honeycomb structure.
  • Carbon microcoil has the property of generating heat by absorbing electromagnetic waves.
  • electromagnetic waves microwaves
  • the microcoil is heated.
  • the end surface of the carrier 60 is heated by the heat generated by the microcoil.
  • the electromagnetic wave absorber 70 applied to the end face of the carrier 60 can be applied to the entire end face.
  • only the end face center portion 61 has an annular portion 62 outside the center (the end face radius of the carrier 60 is 3R).
  • the coating can be applied only to the outer annular portion 63 (in the range of 2R to 3R when the end surface radius of the carrier 60 is 3R). According to experiments by the present inventors, it is preferable to apply to the annular portion 63. It was also found effective when applied to the end face center portion 61.
  • the exhaust emission control device 10 of this embodiment includes an electromagnetic wave oscillator 3 that supplies an electromagnetic wave to the internal combustion engine 22 and the electromagnetic wave irradiation antenna 7 and a control unit 5 that controls the electromagnetic wave oscillator 3.
  • This control means 5 performs the same control as in the first embodiment, effectively performs electromagnetic wave oscillation, and effectively prevents the semiconductor device from being damaged by the reflected wave. Then, the control means 5 irradiates electromagnetic waves (microwaves) before the cracking operation (before idling operation) for starting the internal combustion engine 22 as the operation control of the exhaust gas purification apparatus 10, and raises the temperature of the end face of the carrier 60 to a certain temperature.
  • the internal combustion engine 22 is started at a low speed (specifically, the internal combustion engine 22 is rotated at a low speed by a drive device 21 (for example, a drive motor) that can rotate at a lower speed than a normal idling motor.
  • the number of rotations is not particularly limited, but for example, it is operated at a low speed of about 10 to 100 rpm.)
  • a small amount of gas is sent out to the exhaust passage 51.
  • the electromagnetic wave microwave
  • the electromagnetic wave irradiation antenna 7 for irradiating electromagnetic waves has a coaxial structure in which a conductor 71 constituting the antenna body and an insulator 72 (ceramic) covering the conductor 71 are provided, and the conductor 71 is an insulator. It is preferable that the irradiation portion of the conductor 71 exposed from 72 be ( ⁇ / 4) ⁇ n (n is a natural number) where ⁇ is the wavelength of the electromagnetic wave to be irradiated.
  • the conductor 71 of the electromagnetic wave irradiation antenna 7 it is preferable to arrange the conductor 71 of the electromagnetic wave irradiation antenna 7 so as to be positioned in the vicinity of the portion where the electromagnetic wave absorber 70 is applied (in the present embodiment, an example in which the conductor 71 is applied to the end surface center portion 61). Show).
  • the conductor 71 can be a straight line as shown in FIG. 8 (b) or a circular shape as shown in FIG. 8 (c). In the case of a circular shape, the ends may be connected in the vicinity of the insulator 72 to form an annular shape.
  • the carrier 60 is heated by raising the temperature of the electromagnetic wave absorber 70 by the electromagnetic wave of the electromagnetic wave emission device 9 of the exhaust gas purification device 10.
  • the heating temperature is a temperature at which the catalyst is activated, for example, , Configured to heat the catalyst to 300-400 degrees Celsius.
  • hydrocarbons (HC), carbon monoxide (CO), and nitrogen oxides (NOx) contained in the exhaust gas are decomposed by the catalyst that has reached the activation temperature.
  • the cleaned exhaust gas flows through an exhaust passage (not shown) arranged on the downstream side and is released to the atmosphere.
  • the electromagnetic wave oscillation device of the present invention can be suitably used for a heating device using dielectric heating typified by a microwave oven when used as an electromagnetic wave oscillation source of an electromagnetic wave irradiation antenna.
  • a heating device using dielectric heating typified by a microwave oven
  • an electromagnetic wave oscillation source of an electromagnetic wave irradiation antenna that irradiates plasma by an ignition plug of an internal combustion engine such as an automobile engine
  • it can also be used for maintaining and expanding the plasma by the ignition plug.
  • it can be suitably used for a heating device using an electromagnetic wave absorber or a device for supplying microwaves to an exhaust purification device, a garbage disposal machine using electromagnetic waves, or the like.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
  • Constitution Of High-Frequency Heating (AREA)

Abstract

L'invention fournit un dispositif d'oscillation à ondes électromagnétiques qui ne se contente pas d'arrêter un oscillateur à ondes électromagnétiques en cas d'augmentation des ondes réfléchies, mais qui permet aussi d'empêcher l'endommagement d'un dispositif par les ondes réfléchies, sans abaisser le rendement de l'ensemble du dispositif d'oscillation à ondes électromagnétiques. Le dispositif d'oscillation à ondes électromagnétiques de l'invention est équipé : d'un convertisseur (2) qui transforme une tension provenant d'une alimentation (P) en une tension de courant continu ; de l'oscillateur à ondes électromagnétiques (3) qui soumet des ondes électromagnétiques à une oscillation pulsée à l'aide de la tension de courant continu appliquée par le convertisseur (2) ; d'un détecteur (8) qui détecte les ondes progressives et les ondes réfléchies parmi les ondes électromagnétiques émises par l'oscillateur à ondes électromagnétiques (3) entre celui-ci et une cavité (C) alimentée en énergie d'ondes électromagnétiques provenant de l'oscillateur à ondes électromagnétiques (3) ; et d'un dispositif de commande (5) auquel est appliqué un signal de détection provenant du détecteur (8), et qui simultanément commande l'oscillateur à ondes électromagnétiques (3). Le dispositif de commande (5) est tel qu'il commande l'oscillation en faisant fluctuer la fréquence des ondes électromagnétiques émises, dans le cas où le rapport d'ondes stationnaires détecté par le détecteur (8) est supérieur ou égal à une valeur prédéfinie.
PCT/JP2017/021887 2016-06-14 2017-06-14 Dispositif d'oscillation à ondes électromagnétiques WO2017217438A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2018523950A JP6944666B2 (ja) 2016-06-14 2017-06-14 電磁波発振装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016117991 2016-06-14
JP2016-117991 2016-06-14

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WO2017217438A1 true WO2017217438A1 (fr) 2017-12-21

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008007777A2 (fr) * 2006-07-14 2008-01-17 Sunny Engineering Co., Ltd Dispositif de chauffage par induction à micro-ondes
WO2011004561A1 (fr) * 2009-07-10 2011-01-13 パナソニック株式会社 Dispositif de chauffage aux micro-ondes et procédé de commande de chauffage aux micro-ondes
JP2011070867A (ja) * 2009-09-25 2011-04-07 Toshiba Hokuto Electronics Corp 電子レンジおよび電子レンジ用マグネトロン

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008007777A2 (fr) * 2006-07-14 2008-01-17 Sunny Engineering Co., Ltd Dispositif de chauffage par induction à micro-ondes
WO2011004561A1 (fr) * 2009-07-10 2011-01-13 パナソニック株式会社 Dispositif de chauffage aux micro-ondes et procédé de commande de chauffage aux micro-ondes
JP2011070867A (ja) * 2009-09-25 2011-04-07 Toshiba Hokuto Electronics Corp 電子レンジおよび電子レンジ用マグネトロン

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JP6944666B2 (ja) 2021-10-06

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