WO2018061494A1 - 超音波振動子駆動装置およびメッシュ式ネブライザ - Google Patents

超音波振動子駆動装置およびメッシュ式ネブライザ Download PDF

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Publication number
WO2018061494A1
WO2018061494A1 PCT/JP2017/028912 JP2017028912W WO2018061494A1 WO 2018061494 A1 WO2018061494 A1 WO 2018061494A1 JP 2017028912 W JP2017028912 W JP 2017028912W WO 2018061494 A1 WO2018061494 A1 WO 2018061494A1
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WIPO (PCT)
Prior art keywords
current
ultrasonic transducer
frequency
voltage
conversion circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
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PCT/JP2017/028912
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English (en)
French (fr)
Japanese (ja)
Inventor
真郎 前田
秀孝 東郷
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Omron Healthcare Co Ltd
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Omron Healthcare Co Ltd
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Priority to DE112017004833.8T priority Critical patent/DE112017004833B4/de
Priority to CN201780055140.0A priority patent/CN109689229B/zh
Publication of WO2018061494A1 publication Critical patent/WO2018061494A1/ja
Priority to US16/351,569 priority patent/US10603683B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M15/00—Inhalators
    • A61M15/0085—Inhalators using ultrasonics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B17/00—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
    • B05B17/04—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods
    • B05B17/06—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations
    • B05B17/0607—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by electrical means, e.g. piezoelectric transducers
    • B05B17/0623—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by electrical means, e.g. piezoelectric transducers coupled with a vibrating horn
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M11/00—Sprayers or atomisers specially adapted for therapeutic purposes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M11/00—Sprayers or atomisers specially adapted for therapeutic purposes
    • A61M11/005—Sprayers or atomisers specially adapted for therapeutic purposes using ultrasonics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B17/00—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
    • B05B17/04—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods
    • B05B17/06—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B17/00—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
    • B05B17/04—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods
    • B05B17/06—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations
    • B05B17/0607—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by electrical means, e.g. piezoelectric transducers
    • B05B17/0638—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by electrical means, e.g. piezoelectric transducers spray being produced by discharging the liquid or other fluent material through a plate comprising a plurality of orifices
    • B05B17/0646—Vibrating plates, i.e. plates being directly subjected to the vibrations, e.g. having a piezoelectric transducer attached thereto
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B17/00—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
    • B05B17/04—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods
    • B05B17/06—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations
    • B05B17/0607—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by electrical means, e.g. piezoelectric transducers
    • B05B17/0653—Details
    • B05B17/0669—Excitation frequencies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/0207—Driving circuits
    • B06B1/0223—Driving circuits for generating signals continuous in time
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/0207—Driving circuits
    • B06B1/0223—Driving circuits for generating signals continuous in time
    • B06B1/0238—Driving circuits for generating signals continuous in time of a single frequency, e.g. a sine-wave
    • B06B1/0246—Driving circuits for generating signals continuous in time of a single frequency, e.g. a sine-wave with a feedback signal
    • B06B1/0253—Driving circuits for generating signals continuous in time of a single frequency, e.g. a sine-wave with a feedback signal taken directly from the generator circuit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B2201/00—Indexing scheme associated with B06B1/0207 for details covered by B06B1/0207 but not provided for in any of its subgroups
    • B06B2201/70—Specific application

Definitions

  • the present invention relates to an ultrasonic transducer driving device, and more particularly, to an ultrasonic transducer driving device that is driven by applying a driving voltage (alternating voltage) to an ultrasonic transducer having a specific resonance frequency.
  • the present invention also relates to a mesh nebulizer provided with such an ultrasonic transducer driving device.
  • the ultrasonic transducer is of a type in which a piezoelectric element and a horn that transmits vibration of the piezoelectric element are combined together as is widely used for forming, for example, a mesh type nebulizer (as appropriate “ In the case of “horn resonator”, the Q value (resonance sharpness) is very high as can be seen from FIG.
  • a mesh type nebulizer as appropriate “ In the case of “horn resonator”, the Q value (resonance sharpness) is very high as can be seen from FIG.
  • fr a specific resonance frequency
  • fr the practical range of the drive voltage frequency
  • the horizontal axis represents the frequency of the drive voltage
  • the vertical axis represents the impedance (shown by a solid line) and the phase (shown by a broken line) of the horn vibrator.
  • the resonance frequency fr of the horn vibrator has a manufacturing variation of about ⁇ 1.5 kHz.
  • a rectangular wave-like alternating voltage generated by the driving IC (which is the source of the driving voltage) is sine through a conversion circuit including an inductive reactance element (L) and a capacitive reactance element (C).
  • L inductive reactance element
  • C capacitive reactance element
  • an object of the present invention is an ultrasonic transducer driving apparatus that applies a sinusoidal alternating voltage as a driving voltage to an ultrasonic transducer having a specific resonance frequency via a conversion circuit, The object is to provide a device capable of suppressing leakage current. Moreover, the subject of this invention is providing the mesh type nebulizer provided with such an ultrasonic transducer
  • an ultrasonic transducer driving device of the present invention is An ultrasonic transducer driving apparatus that drives by applying a driving voltage to an ultrasonic transducer including a piezoelectric element and having a specific resonance frequency, A drive voltage generator that generates a rectangular wave-shaped alternating voltage that is a source of the drive voltage in a frequency range that includes a resonance frequency of the ultrasonic transducer; and A rectangular wave-shaped alternating voltage generated by the driving voltage generating unit is inserted into a wiring path from the driving voltage generating unit to the ultrasonic transducer and is generated by the inductive reactance element and the capacitive reactance element.
  • a conversion circuit that converts the voltage into a voltage, and this sinusoidal alternating voltage is applied to the ultrasonic transducer as the drive voltage,
  • a first current detector for detecting a first current flowing from the drive voltage generator to the conversion circuit;
  • a second current detection unit for detecting a second current flowing from the conversion circuit to the ultrasonic transducer;
  • a frequency control unit that controls the drive voltage generation unit to change the frequency of the rectangular-wave alternating voltage so that the difference between the first current and the second current approaches a minimum value; It is provided with.
  • the “rectangular wave shape” includes not only a strict rectangular wave but also a waveform having an angle that can be regarded as a substantially rectangular wave in use as a driving voltage for the ultrasonic transducer.
  • the “sine wave shape” includes not only a strict sine wave but also a smoothly changing waveform that can be regarded as a substantially sine wave when used as a driving voltage for the ultrasonic transducer.
  • the drive voltage generator generates the rectangular-wave alternating voltage that is the source of the drive voltage in a frequency range that includes the resonance frequency of the ultrasonic transducer.
  • the conversion circuit inserted in the wiring path from the drive voltage generator to the ultrasonic transducer converts the rectangular wave-shaped alternating voltage generated by the drive voltage generator by an inductive reactance element and a capacitive reactance element. Convert to sinusoidal alternating voltage. This sinusoidal alternating voltage is applied to the ultrasonic transducer as the drive voltage. Therefore, even if the frequency of the driving voltage slightly deviates from the resonance frequency of the ultrasonic transducer, a decrease in driving efficiency can be suppressed.
  • the first current detection unit detects the first current flowing from the drive voltage generation unit to the conversion circuit
  • the second current detection unit includes the conversion circuit.
  • the second current flowing from the current to the ultrasonic transducer is detected.
  • the frequency control unit controls the drive voltage generation unit to change the frequency of the rectangular-wave alternating voltage so that the difference between the first current and the second current approaches a minimum value. Do.
  • the impedance of the conversion circuit matches the impedance of the ultrasonic transducer. Therefore, the difference between the first current and the second current, that is, the leakage current to the ground via the conversion circuit is suppressed. As a result, an increase in current consumption can be suppressed.
  • the difference between the first current and the second current is a peak-to-peak value of the first current and a peak of the second current.
  • the difference between the first current and the second current can be easily obtained regardless of the phase of the first and second currents. .
  • the impedance indicated by the conversion circuit in a frequency range including the resonance frequency of the ultrasonic transducer is substantially equal to the minimum impedance value of the ultrasonic transducer. It is characterized by being set to.
  • the impedance indicated by the conversion circuit in the frequency range including the resonance frequency of the ultrasonic transducer substantially matches the minimum value of the impedance of the ultrasonic transducer.
  • the ultrasonic transducer is a horn transducer configured by integrally combining the piezoelectric element and a horn that transmits vibration of the piezoelectric element. To do.
  • the ultrasonic transducer is a horn transducer configured by integrally combining the piezoelectric element and a horn that transmits vibration of the piezoelectric element. Therefore, even if the frequency of the drive voltage slightly deviates from the resonance frequency of the ultrasonic transducer, the advantage of the present invention that the reduction in drive efficiency can be suppressed is great.
  • the mesh nebulizer of the present invention is The ultrasonic vibrator driving device according to the invention, wherein the ultrasonic vibrator is a horn vibrator configured by integrally combining the piezoelectric element and a horn that transmits vibration of the piezoelectric element, A flat plate-like or sheet-like mesh portion arranged to face the vibration surface of the horn vibrator, The liquid supplied between the vibration surface and the mesh part is atomized and sprayed through the mesh part.
  • the “flat plate or sheet mesh portion” means an element for atomizing a liquid by having a plurality of through holes penetrating the flat plate or sheet and passing through the through holes. To do.
  • the sheet includes a film.
  • the liquid can be efficiently atomized and sprayed, and an increase in current consumption can be suppressed.
  • the ultrasonic transducer driving apparatus of the present invention is an ultrasonic vibration that applies a sinusoidal alternating voltage as a drive voltage to an ultrasonic transducer having a specific resonance frequency via a conversion circuit.
  • This is a slave drive device, and leakage current to the ground can be suppressed.
  • the mesh type nebulizer of the present invention the liquid can be efficiently atomized and sprayed, and an increase in current consumption can be suppressed.
  • FIG. 5A and FIG. 5A show the circuit structure by which the conversion circuit was inserted in the wiring path
  • 5C show a first flow from the drive voltage generator to the conversion circuit when the frequency of the rectangular-wave alternating voltage generated by the drive voltage generator is sequentially increased. It is a figure which shows the change of an electric current.
  • 5 (B) and 5 (D) correspond to FIGS. 5 (A) and 5 (C), respectively, and the frequency of the rectangular-wave alternating voltage generated by the drive voltage generator is sequentially increased. It is a figure which shows the change of the 2nd electric current which flows from the said conversion circuit to the said horn vibrator at the time.
  • FIGS. 6A and 6C show a first flow from the drive voltage generator to the conversion circuit when the frequency of the rectangular-wave alternating voltage generated by the drive voltage generator is sequentially increased. It is a figure which shows the change of an electric current.
  • FIGS. 6A and 6C respectively correspond to FIGS. 6A and 6C, in which the frequency of the rectangular-wave alternating voltage generated by the drive voltage generator is sequentially increased. It is a figure which shows the change of the 2nd electric current which flows from the said conversion circuit to the said horn vibrator at the time.
  • FIG. 7A is a diagram showing a change in the first current flowing from the drive voltage generator to the conversion circuit when the frequency of the rectangular-wave alternating voltage generated by the drive voltage generator is further increased. It is.
  • FIG. 7B corresponds to FIG. 7A, and flows from the conversion circuit to the horn vibrator when the frequency of the rectangular-wave alternating voltage generated by the drive voltage generator is further increased. It is a figure which shows the change of a 2nd electric current.
  • FIG. 2 shows a configuration of an atomizing unit of a mesh nebulizer (the whole is denoted by reference numeral 1) equipped with the ultrasonic transducer driving device of one embodiment of the present invention.
  • the mesh nebulizer 1 includes a main body 10 having an opening 18 at an upper portion thereof, and a horn vibrator 40 as an ultrasonic vibrator built in the main body 10.
  • a power switch (not shown) is provided on the outer surface of the main body 10.
  • the horn vibrator 40 includes a vibrating surface 43 disposed horizontally facing the upper opening 18, a piezoelectric element 41 disposed at a position spaced downward from the vibrating surface 43, and the piezoelectric element 41 and the vibrating surface 43. And a horn 42 that amplifies the vibration of the piezoelectric element 41 and transmits it to the vibration surface 43 is integrally combined.
  • a driving voltage for the horn vibrator 40 (more precisely, the piezoelectric element 41) is supplied by an ultrasonic vibrator driving device 60 described later.
  • the horn vibrator 40 has a unique resonance frequency fr as exemplified in FIGS.
  • the replacement member 20 is detachably mounted between the opening 18 and the vibration surface 43.
  • the replacement member 20 includes a film 21 as a flat sheet facing the vibration surface 43, and a substantially annular bottom plate portion 22 that supports the periphery of the film 21.
  • the film 21 is attached to the upper surface of the bottom plate portion 22 by adhesion or welding.
  • a substantially central region of the film 21 forms a mesh portion 21a.
  • a large number of fine through holes (not shown) penetrating the film 21 are formed in the mesh portion 21a.
  • the bottom plate portion 22 is in contact with the edge portion 43e of the vibration surface 43 at one location for positioning.
  • the replacement member 20 is supported by elements (not shown) in the main body 10 together with the horn vibrator 40 in a state where the replacement member 20 is slightly inclined with respect to the vibration surface 43.
  • it replaces with the film 21 and the mesh part 21a may be comprised by forming many fine through-holes in a flat plate.
  • the user tilts the main body 10 slightly with respect to the vertical direction.
  • the liquid in this example, a chemical
  • the liquid supply unit 17 in the main body 10 toward the vibration surface 43 of the horn vibrator 40 as indicated by an arrow F. That is, the chemical solution is supplied between the vibration surface 43 and the mesh portion 21a.
  • a driving voltage is applied to the piezoelectric element 41 of the horn vibrator 40, and the vibration surface 43 is vibrated via the horn 42.
  • the chemical liquid is atomized through the mesh portion 21 a (more precisely, a plurality of through holes penetrating the film 21) and sprayed through the opening 18.
  • FIG. 1 shows a block configuration of an ultrasonic transducer driving device 60 mounted on the mesh nebulizer 1.
  • the ultrasonic transducer driving device 60 includes a drive voltage generator 62, a pair of wires 67 and 68 as a wiring path extending from the drive voltage generator 62 to the horn transducer 40, and the wires 67 and 68.
  • the conversion circuit 63 is included.
  • the ultrasonic transducer driving device 60 outputs the first current detection unit 65, the second current detection unit 66, and the outputs of the first current detection unit 65 and the second current detection unit 66.
  • a control unit 61 that controls the drive voltage generation unit 62 described above.
  • the drive voltage generator 62 includes, for example, a commercially available function generator IC (integrated circuit).
  • the drive voltage generator 62 generates a rectangular wave-shaped alternating voltage Vg, which is a source of the drive voltage, in a frequency range including the resonance frequency fr of the horn vibrator 40. It occurs variably.
  • the drive voltage generator 62 has a function capable of varying the frequency f by 0.05 kHz in a range of at least 175 kHz to 185 kHz. Further, the ratio between the positive voltage period and the negative voltage period of the alternating voltage Vg is variable, but in this example, it is assumed to be 1: 1 (duty 50%).
  • the drive voltage generator 62 includes an amplifier, and outputs an alternating voltage Vg having an amplitude sufficient to drive the horn vibrator 40.
  • the conversion circuit 63 is a coil L1 as an inductive reactance element inserted in one wiring 67, and the horn vibrator 40 side of the wiring 67 from the coil L1 (refer to the right side in FIG. 1). (Referred to as “right side”) and a ground GND (indicated by ⁇ in FIG. 1; the same shall apply hereinafter) and a capacitor C1 serving as a capacitive reactance element and the other wiring 68.
  • a coil L2 as an inductive reactance element and a capacitor C2 as a capacitive reactance element connected between a portion 68c on the right side of the coil L2 of the wiring 68 and the ground GND are included. For example, as shown in FIG.
  • the conversion circuit 63 converts the rectangular-wave alternating voltage Vg generated by the drive voltage generator 62 into a sine-wave alternating voltage Va.
  • This sinusoidal alternating voltage Va is applied as a drive voltage to the horn vibrator 40 shown in FIG. Therefore, even if the frequency f of the drive voltage slightly deviates from the resonance frequency fr of the horn vibrator 40, a decrease in drive efficiency can be suppressed.
  • the first current detector 65 amplifies the current detecting resistor R2 inserted between the drive voltage generator 62 and the coil L2 in the wiring 68 and the voltage dropped to the resistor R2. And an operational amplifier (operational amplifier) U1.
  • the voltage dividing resistor element R 5 between the portion 68 a of the resistor element R 2 on the side of the drive voltage generator 62 (referring to the left side in FIG. 1; hereinafter simply referred to as “left side”) and the ground GND. R6 is connected in series. The potential at the connection point between the resistance elements R5 and R6 is input to the non-inverting input terminal (+) of the operational amplifier U1.
  • voltage dividing resistance elements R7 and R8 are connected in series between a portion 68b on the right side of the resistance element R2 in the wiring 68 and the ground GND.
  • the potential at the connection point between the resistance elements R7 and R8 is input to the inverting input terminal ( ⁇ ) of the operational amplifier U1.
  • a resistance element R9 for feedback is connected between the output terminal (OUT) and the inverting input terminal ( ⁇ ) of the operational amplifier U1.
  • the second current detection unit 66 includes a current detection resistance element R4 inserted between the coil L2 and the horn vibrator 40 in the above-described wiring 68, and a voltage dropped to the resistance element R4. And an operational amplifier U2.
  • the voltage dividing resistor elements R10 and R11 are connected in series between the left portion 68d of the resistor element R4 in the wiring 68 and the ground GND.
  • the potential at the connection point between the resistance elements R10 and R11 is input to the non-inverting input terminal (+) of the operational amplifier U2.
  • voltage dividing resistance elements R12 and R13 are connected in series between a portion 68e on the right side of the resistance element R4 in the wiring 68 and the ground GND.
  • the potential at the connection point between the resistance elements R12 and R13 is input to the inverting input terminal ( ⁇ ) of the operational amplifier U2.
  • a resistance element R14 for feedback is connected between the output terminal (OUT) and the inverting input terminal ( ⁇ ) of the operational amplifier U1.
  • a resistance element R1 is interposed between the driving voltage generation unit 62 and the coil L1 in the wiring 67.
  • a resistance element R3 is interposed between the coil L1 and the horn vibrator 40 in the wiring 67.
  • the control unit 61 includes a CPU (Central Processing Unit) and operates as a frequency control unit, based on the output i1a of the first current detection unit 65 and the output i2a of the second current detection unit 66. Thus, the operation of the drive voltage generator 62 is controlled by the control signal Cnt1f. In addition, the control unit 61 controls the entire operation of the mesh nebulizer 1.
  • CPU Central Processing Unit
  • the control unit 61 when the power switch of the mesh nebulizer 1 is turned on, the control unit 61 operates as a frequency control unit to perform the frequency control process described below (step S11 in FIG. 3). When a certain period (for example, 10 minutes) has elapsed since the user turned on the power switch, or when the user turned off the power switch, the control unit 61 ends the process (step S12 in FIG. 3).
  • the frequency control process by the control unit 61 is performed according to the flow shown in FIG.
  • the control unit 61 first sets the frequency f of the rectangular wave-shaped alternating voltage Vg generated by the drive voltage generation unit 62 to a predetermined start frequency fo.
  • the start frequency fo may be determined in advance for each individual horn vibrator 40 or, for example, representative of the resonance frequency for each lot of the horn vibrator 40 in consideration of manufacturing variations in the resonance frequency. It may be determined in advance to match the value (average value).
  • step S ⁇ b> 22 of FIG. 4 the control unit 61 detects the first current i ⁇ b> 1 flowing from the drive voltage generation unit 62 to the conversion circuit 63 based on the output i ⁇ b> 1 a of the first current detection unit 65.
  • the second current i2 flowing from the conversion circuit 63 to the horn vibrator 40 is detected.
  • the peak-to-peak value i1p - p of the first current i1 is detected
  • FIG. 5 (B) the second The peak-to-peak value i2p - p of current i2 is detected.
  • the controller 61 determines the difference between the first current i1 and the second current i2, in this example, the peak-to-peak value of the first current i1. i1p - p and peak-to-peak value of the second current i2 i2p - the difference between p (i1p - p-i2p - p) to determine whether the neighborhood minimum.
  • whether or not it is in the vicinity of the minimum value may be determined depending on whether or not the difference (i1p ⁇ p ⁇ i2p ⁇ p) is equal to or less than a predetermined threshold value.
  • control unit 61 applies a rectangular wave-shaped alternating voltage Vg to the drive voltage generation unit 62. Control to maintain the frequency f is performed. Then, the processes in steps S22 to S24 are repeated.
  • the control unit 61 causes the difference (i1p ⁇ p ⁇ i2p ⁇ p) to approach the minimum value.
  • the drive voltage generator 62 is controlled to change the frequency f of the alternating voltage Vg having a rectangular wave shape to be higher or lower (step S25 in FIG. 4).
  • the control unit 61 repeats the processes of steps S22 to S23 and S25 until the difference (i1p ⁇ p ⁇ i2p ⁇ p) comes close to the minimum value.
  • FIG. 5A, FIG. 5C, FIG. 6A, FIG. 6C, and FIG. 7A show the drive voltage generator 62 for a certain horn vibrator 40.
  • the peak-to-peak value i1p - p of the first current i1 is shown.
  • 5 (B), FIG. 5 (D), FIG. 6 (B), FIG. 6 (D), and FIG. 7 (B) are respectively shown in FIG. 5 (A), FIG. 5 (C), and FIG.
  • oscillator 40 from the conversion circuit 63 at the time is shown.
  • the peak-to-peak value i2p - p of the second current i2 is shown.
  • the rectangular waveform alternating voltage Vg generated by the drive voltage generator 62 and the sine waveform alternating voltage Va converted by the conversion circuit 63 shift the zero level for easy understanding. Is shown.
  • leakage current to the ground GND via the conversion circuit 63 can be suppressed, and an increase in current consumption can be suppressed.
  • the impedance shown by the conversion circuit 63 in the frequency range of 175 kHz to 185 kHz including the resonance frequency fr of the horn vibrator 40 is the minimum value Zmin of the impedance of the horn vibrator 40 (in this example, about 100 ⁇ ).
  • Zmin the impedance of the horn vibrator 40
  • the frequency f of the rectangular-wave alternating voltage Vg substantially coincides with the resonance frequency fr of the horn vibrator 40 (frequency that gives the minimum impedance value Zmin ⁇ 100 ⁇ of the horn vibrator 40).
  • the driving efficiency of the horn vibrator 40 is increased.
  • the liquid can be efficiently atomized and sprayed, and an increase in current consumption can be suppressed.
  • the difference between the first current i1 and the second current i2 is the peak-to-peak value i1p - p of the first current i1 and the peak-to-peak of the second current i2.
  • peak value i2p - were assumed to be the difference between p (i1p-p-i2p- p).
  • the difference between the first current i1 and the second current i2 is the difference between the amplitude of the first current i1 and the amplitude of the second current i2, or the effective value of the first current i1. It may be a difference between the effective value of the second current i2. In any case, the “difference” can be easily obtained regardless of the phases of the first current i1, the second current i2, and the first and second currents.

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Animal Behavior & Ethology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Anesthesiology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Bioinformatics & Cheminformatics (AREA)
  • Pulmonology (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Special Spraying Apparatus (AREA)
PCT/JP2017/028912 2016-09-27 2017-08-09 超音波振動子駆動装置およびメッシュ式ネブライザ Ceased WO2018061494A1 (ja)

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DE112017004833.8T DE112017004833B4 (de) 2016-09-27 2017-08-09 Vernebler vom Netztyp
CN201780055140.0A CN109689229B (zh) 2016-09-27 2017-08-09 超声波振子驱动装置和网眼式喷雾器
US16/351,569 US10603683B2 (en) 2016-09-27 2019-03-13 Ultrasonic vibrator driving apparatus and mesh nebulizer

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US12052925B2 (en) 2016-01-23 2024-07-30 Liat Keng KANG Method and device for driving a piezoelectric device
CN111438026B (zh) * 2020-03-25 2022-03-11 广州厚达电子科技有限公司 一种超声波雾化器的驱动方法
KR102402071B1 (ko) * 2020-07-24 2022-05-24 주식회사 케이티앤지 초음파 진동자 캘리브레이션 장치 및 그 방법
JP7571675B2 (ja) 2021-06-25 2024-10-23 オムロンヘルスケア株式会社 ネブライザ
CN117000494A (zh) * 2022-04-27 2023-11-07 深圳市合元科技有限公司 超声雾化装置
CN115569276A (zh) * 2022-11-25 2023-01-06 四川康谷康业科技有限公司 出雾速率和出雾量可调控的医用微网式雾化方法及系统
CN119632305A (zh) * 2023-09-15 2025-03-18 深圳市合元科技有限公司 电子雾化装置及控制方法

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WO2005080793A1 (ja) * 2004-02-23 2005-09-01 Nec Corporation 圧電ポンプ用駆動回路およびこれを用いた冷却システム
JP2014004211A (ja) * 2012-06-26 2014-01-16 Omron Healthcare Co Ltd 液体噴霧装置

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CN109689229A (zh) 2019-04-26
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DE112017004833B4 (de) 2022-11-24
DE112017004833T5 (de) 2019-06-13
CN109689229B (zh) 2021-02-19
US10603683B2 (en) 2020-03-31
JP6711225B2 (ja) 2020-06-17

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