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公开(公告)号：US20170365768A1
公开(公告)日：2017-12-21
申请号：US15693951
申请日：2017-09-01
发明人： Kenjiro Okaguchi
CPC分类号： H01L41/042 , B06B1/0207 , F04B9/00 , F04B17/003 , F04B49/065 , F04B49/08 , F04B2203/0402
摘要： A piezoelectric element driving circuit includes a boosting circuit, a driving circuit, a waveform shaping circuit, and a computing circuit. The driving circuit includes a differential amplifier circuit with an LPF, an amplifier circuit with a BPF, an inverter, a resistor, and a comparator. The driving circuit applies a driving signal to a piezoelectric element of a piezoelectric pump. The waveform shaping circuit extracts a voltage signal from the driving circuit. On the basis of the voltage signal, the waveform shaping circuit and the computing circuit determine a voltage value corresponding to driving current flowing through the piezoelectric element. The computing circuit outputs a control signal to the boosting circuit on the basis of the voltage value. The boosting circuit sets the value of a DC supply voltage on the basis of the control signal, and outputs the DC supply voltage.
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公开(公告)号：US20170095599A1
公开(公告)日：2017-04-06
申请号：US15383496
申请日：2016-12-19
IPC分类号： A61M1/00
CPC分类号： A61M1/0066 , A61M1/0003 , A61M1/0023 , A61M1/0052 , A61M1/0072 , A61M2205/42 , A61M2205/75 , A61M2205/82
摘要： An inhalation device includes a nozzle, a separator, a housing, a battery portion, a circuit board, and a piezoelectric blower. The piezoelectric blower has a suction hole that opens near the center of an upper surface of the piezoelectric blower and a discharge hole that opens at the center of a bottom surface of the piezoelectric blower. The piezoelectric blower is mounted on a first main surface of the circuit board on the side of an upper housing. The circuit board applies a drive voltage to the piezoelectric blower to drive the piezoelectric blower. The circuit board has a through-hole facing the discharge hole. The through-hole overlaps the discharge hole, out of the suction hole and the discharge hole, when the first main surface of the circuit board is viewed from a front side.
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公开(公告)号：US10286124B2
公开(公告)日：2019-05-14
申请号：US15383496
申请日：2016-12-19
摘要： An inhalation device includes a nozzle, a separator, a housing, a battery portion, a circuit board, and a piezoelectric blower. The piezoelectric blower has a suction hole that opens near the center of an upper surface of the piezoelectric blower and a discharge hole that opens at the center of a bottom surface of the piezoelectric blower. The piezoelectric blower is mounted on a first main surface of the circuit board on the side of an upper housing. The circuit board applies a drive voltage to the piezoelectric blower to drive the piezoelectric blower. The circuit board has a through-hole facing the discharge hole. The through-hole overlaps the discharge hole, out of the suction hole and the discharge hole, when the first main surface of the circuit board is viewed from a front side.
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公开(公告)号：US11605773B2
公开(公告)日：2023-03-14
申请号：US15693951
申请日：2017-09-01
发明人： Kenjiro Okaguchi
摘要： A piezoelectric element driving circuit includes a boosting circuit, a driving circuit, a waveform shaping circuit, and a computing circuit. The driving circuit includes a differential amplifier circuit with an LPF, an amplifier circuit with a BPF, an inverter, a resistor, and a comparator. The driving circuit applies a driving signal to a piezoelectric element of a piezoelectric pump. The waveform shaping circuit extracts a voltage signal from the driving circuit. On the basis of the voltage signal, the waveform shaping circuit and the computing circuit determine a voltage value corresponding to driving current flowing through the piezoelectric element. The computing circuit outputs a control signal to the boosting circuit on the basis of the voltage value. The boosting circuit sets the value of a DC supply voltage on the basis of the control signal, and outputs the DC supply voltage.
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公开(公告)号：US10511236B2
公开(公告)日：2019-12-17
申请号：US15403552
申请日：2017-01-11
发明人： Kenjiro Okaguchi
摘要： A piezoelectric device drive circuit applies a drive signal to a piezoelectric device. An H-bridge circuit includes a first input terminal, a second input terminal, a first output terminal, and a second output terminal, the first output terminal and the second output terminal being connected to the piezoelectric device. A resistor is connected between the piezoelectric device and the first output terminal. A differential amplifier circuit receives, as an input, a voltage across the resistor. An inverting circuit has an input terminal connected to an output terminal of the differential amplifier circuit. A comparator has an input terminal connected to an input terminal of the inverting circuit, and an output terminal connected to the first input terminal. A comparator has an input terminal connected to an output terminal of the inverting circuit, and an output terminal connected to the second input terminal.
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公开(公告)号：US09711706B2
公开(公告)日：2017-07-18
申请号：US14296587
申请日：2014-06-05
发明人： Kenjiro Okaguchi
CPC分类号： H01L41/042
摘要： A piezoelectric element drive circuit includes an H bridge circuit, an LPF-attached differential amplifier circuit, an amplifier circuit, and an inverter circuit. First and second drive signals output from the H bridge circuit and having opposite phases are applied to a piezoelectric element. A voltage between opposite ends of a resistor connected to a first output terminal of the H bridge circuit is input to the LPF-attached differential amplifier circuit. A differential signal output from the LPF-attached differential amplifier circuit has a lower slew rate because harmonic components are suppressed by the function of a low pass filter. Accordingly, respective slew rates of first and second control signals input to first and second input terminals of the H bridge circuit are also reduced. Hence the first and second control signals are each provided as a signal having a step-like waveform and including harmonic components that have been suppressed.
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公开(公告)号：US11191437B2
公开(公告)日：2021-12-07
申请号：US15412574
申请日：2017-01-23
发明人： Atsuhiko Hirata , Kenjiro Okaguchi
IPC分类号： A61B5/022 , A61B5/0235 , F04B45/047 , F04B49/06 , F16K31/02 , F16K31/06 , F04B43/00 , F04B43/02 , F04B43/04 , F15B20/00
摘要： A fluid control device (10) includes a container (13), a pump (11), a solenoid valve (12), and a capacitor. The pump (11) is driven by a main power source, and is capable of pressurizing or depressurizing the inside of the container (13). A suction port and a discharge port of the pump (11) internally communicate with each other. The solenoid valve (12) is connected at both ends thereof to the container (13) and the pump (11). If the voltage of the main power source is reduced or lost, the solenoid valve (12) releases pressure in the container (13) by being driven by the power stored in the capacitor or secondary battery.
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公开(公告)号：US10124096B2
公开(公告)日：2018-11-13
申请号：US15402792
申请日：2017-01-10
发明人： Kenjiro Okaguchi
IPC分类号： A61M1/00 , A61M1/06 , F04B43/06 , F04B49/06 , F04B45/047
摘要： A suction device (10) includes: a suction portion (11) that sucks an external fluid; a piezoelectric pump (21) that includes a piezoelectric element (22) vibrating when a drive voltage is applied thereto and sucks the fluid via the suction portion (11) by vibration of the piezoelectric element (22); a detection circuit (32) that detects a phase difference between a current flowing through the piezoelectric element (22) and the drive voltage for the piezoelectric element; and a control unit (33) that performs a process on the basis of the phase difference detected by the detection circuit (32).
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公开(公告)号：US20170127956A1
公开(公告)日：2017-05-11
申请号：US15412574
申请日：2017-01-23
发明人： Atsuhiko Hirata , Kenjiro Okaguchi
IPC分类号： A61B5/022 , F16K31/06 , F15B20/00 , F16K31/02 , A61B5/0235 , F04B45/047
CPC分类号： A61B5/02233 , A61B5/0235 , A61B2560/0214 , F04B43/0045 , F04B43/0081 , F04B43/026 , F04B43/04 , F04B43/046 , F04B45/047 , F04B49/06 , F15B20/00 , F16K31/02 , F16K31/06
摘要： A fluid control device (10) includes a container (13), a pump (11), a solenoid valve (12), and a capacitor. The pump (11) is driven by a main power source, and is capable of pressurizing or depressurizing the inside of the container (13). A suction port and a discharge port of the pump (11) internally communicate with each other. The solenoid valve (12) is connected at both ends thereof to the container (13) and the pump (11). If the voltage of the main power source is reduced or lost, the solenoid valve (12) releases pressure in the container (13) by being driven by the power stored in the capacitor or secondary battery.
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公开(公告)号：US11592017B2
公开(公告)日：2023-02-28
申请号：US17376553
申请日：2021-07-15
发明人： Kenjiro Okaguchi
摘要： A piezoelectric element drive circuit includes a piezoelectric element driven at a predetermined frequency and having a resonant frequency of (2n+1) times the predetermined frequency (n is a predetermined natural number), and a drive voltage generator that has a first output terminal connected to a first terminal of the piezoelectric element and a second output terminal connected to a second terminal of the piezoelectric element. When the piezoelectric element is driven, a waveform of potential difference between the first output terminal and the second output terminal is a step wave which transitions while taking an intermediate potential. A time length for which the potential difference is the intermediate potential is around (t2−t1)/(2n+1) in a period of time from time t1 at which the potential difference falls to the intermediate potential to time t2 at which the potential difference falls to the intermediate potential subsequently.
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