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US 11,959,472 B2Granted
Piezoelectric pump device
AssigneeMurata Manufacturing Co., Ltd.
InventorKenjiro Okaguchi
Life of this patent
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Abstract
A pump device includes a piezoelectric pump, a piezoelectric pump, and a driving circuit. The piezoelectric pump is driven at a first frequency when singly driven. The piezoelectric pump is driven at a second frequency when singly driven. The driving circuit drives the piezoelectric pump and the piezoelectric pump at the same driving frequency.
Claims15
A pump device comprising:
- a first piezoelectric pump driven at a first frequency when singly driven;
- a second piezoelectric pump driven at a second frequency when singly driven;
- and
- a driving circuit configured to drive the first piezoelectric pump and the second piezoelectric pump together at a driving frequency, the driving frequency being the same for the first piezoelectric pump and the second piezoelectric pump, wherein:
- the first piezoelectric pump and the second piezoelectric pump are electrically connected in parallel with each other and in series to the driving circuit, and
- a difference between the first frequency and the second frequency is less than a predetermined amount, wherein an output impedance of the driving circuit at the driving frequency is less than an input impedance of the first piezoelectric pump and the second piezoelectric pump at the driving frequency, and is equal to or less than an impedance threshold.
3 more elements
Dependencies are inferred from the claim text.