Patent ID: 11959472
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. 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.