Patent ID: 11903321
Assignee: TDK ELECTRONICS AG
Field: Chemical engineering (Chemistry)
Classification: CPC H | IPC H

Claim 38:
39. A device comprising:
a piezoelectric transformer;
a driver circuit configured to apply an input signal to the piezoelectric transformer; and
a field probe comprising a metallization forming a measurement point, at which the field probe is configured to determine a local field strength of an electric field produced by the piezoelectric transformer,
wherein the field probe is configured to measure the field strength of the electric field at the measurement point,
wherein the driver circuit is configured to adapt the input signal while taking into account measurement results of the field probe, and
wherein the device is configured to:
produce a nonthermal atmospheric pressure plasma, and
determine at least one of ageing and a lifetime of the piezoelectric transformer by comparing the measurement values determined by the field probe with a reference signal.