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

Claim 11:
12. The pump device according to claim 1, wherein the driving circuit comprises:
an amplifying circuit configured to output a first driving signal to the first piezoelectric pump and the second piezoelectric pump,
a phase inverting circuit configured to invert a phase of the first driving signal and to output a second driving signal to the first piezoelectric pump and the second piezoelectric pump,
a resistance element that is connected between a parallel circuit and the amplifying circuit, the parallel circuit comprising the first piezoelectric pump and the second piezoelectric pump connected in parallel,
a differential circuit to which a voltage across the resistance element is input, and
a filter circuit configured to remove a harmonic component from an output of the differential circuit, configured to act on the first piezoelectric pump and the second piezoelectric pump, and configured to supply an output of the filter circuit to the amplifying circuit.