US Pat. No. 10,772,182

DEVICE FOR PRODUCING A NON-THERMAL ATMOSPHERIC-PRESSURE PLASMA AND METHOD FOR THE FREQUENCY CONTROL OF A PIEZOELECTRIC TRANSFORMER

TDK ELECTRONICS AG, Muni...

1. A device for producing a non-thermal atmospheric-pressure plasma, the device comprising:a piezoelectric transformer;
an activating circuit configured to apply an AC voltage at an activating frequency to the piezoelectric transformer as an input voltage; and
a field probe configured to measure a field strength of an electric field produced by the piezoelectric transformer,
wherein the activating circuit is configured to adapt the activating frequency based on the measurement results of the field probe in such a way that the field strength is maximized when the device is switched on.

US Pat. No. 10,029,025

SYSTEM AND METHOD FOR REDUCING GERMS BY MEANS OF PLASMA

Relyon Plasma Gmbh, Rege...

1. A system for reducing germs by means of plasma comprising:a housing;
a piezoelectric transformer arranged in said housing;
an opening form in said housing, wherein a high-voltage end of said piezoelectric transformer points to said opening form;
a dielectric film with a peripheral edge forms a cavity, wherein said dielectric film encloses or surrounds an area to be sterilized;
said high-voltage end of said piezoelectric transformer is facing toward a side of the dielectric film which faces away from said cavity, and a plasma is ignitable within said cavity; and,
a first pressure exists within said housing and a second pressure exists in an environment, wherein said second pressure being higher than said first pressure and the dielectric film is sucked to said opening, and said high-voltage end of said piezoelectric transformer is in form-locked contact with said dielectric film.

US Pat. No. 10,143,510

ASSEMBLY FOR TREATING WOUNDS

Relyon Plasma GmbH, Rege...

1. An assembly for treating wounds having a device for generating a plasma and/or an excited gas or gas mixture, wherein the device comprises:a housing;
a piezoelectric transformer arranged in the housing;
a circuit board arranged in the housing, the circuit board including a control circuit, to which the piezoelectric transformer is electrically connected;
an opening formed in the housing towards which a high voltage end of the piezoelectric transformer is directed;
a fan arranged in or at the housing to provide a flow of air within the housing towards the opening, wherein the plasma and/or the excited gas or gas mixture, respectively, generated with the device exits from the opening; and,
an expansion element, including:
a first end removably connected to the housing at the opening; and,
a second end arranged to surround a wound region to be treated, wherein a cross-sectional area of the second end is larger than a cross-sectional area of the first end.

US Pat. No. 10,487,784

DEVICE AND METHOD FOR IMPROVING COMBUSTION

EPCOS AG, Munich (DE) RE...

1. A device for burning a fuel/air mixture comprising:a combustion chamber including at least one combustion chamber inlet for feeding in fuel or air or the fuel/air mixture;
a reactor chamber connected upstream of the combustion chamber, the reactor chamber comprising a plasma generator, wherein the plasma generator is a piezoelectric transformer configured to operate with a low voltage; and
a control apparatus for the plasma generator, wherein the control apparatus is configured to adjust a frequency of the low voltage applied to the piezoelectric transformer and to adapt the frequency to a resonance and an impedance of the piezoelectric transformer, and
wherein the device is configured in such a way that even before a start of an actual combustion process at least one gaseous component in the reactor chamber is enriched with radicals and ions by the plasma generator and is subsequently transferred into the combustion chamber via the combustion chamber inlet for actual combustion.

US Pat. No. 11,071,193

DEVICE FOR PRODUCING A NON-THERMAL ATMOSPHERIC PRESSURE PLASMA AND ACTIVE SPACE COMPRISING SUCH A DEVICE

RELYON PLASMA GMBH, Rege...


1. A device comprising:a first housing, in which a piezoelectric transformer is arranged; and
a second housing, in which a control circuit is arranged, wherein the control circuit is configured to apply an input voltage to the piezoelectric transformer,
wherein the control circuit comprises a time circuit,
wherein the device is configured to operate in a pulsed mode in which time intervals in which the piezoelectric transformer is activated and pause intervals in which the piezoelectric transformer is deactivated alternate,
wherein the piezoelectric transformer is activated in the time intervals based on the time circuit without taking into account other operating parameters of the piezoelectric transformer,
wherein the piezoelectric transformer is deactivated in the pause intervals based on the time circuit,
wherein a length of a pause interval is determined by a purely time-based control system, and
wherein the device is configured to produce a non-thermal atmospheric pressure plasma.