US4790980A — Device for the generation of ozone and a process …

Claim 1

Independent Claim 201 words

A device for the generation of ozone, comprising: a high voltage transformer having a primary winding and a secondary winding; a converter for supplying a square wave current of variable amplitude and of variable frequency to said primary winding; an ozone generator connected across the secondary winding of said high voltage transformer, including a pair of electrodes separated by a solid dielectric and a gas path; and variable compensation reactance means connected across a selected of the primary and secondary windings of said transformer for maintaining a resonant frequency of a resonant circuit including the compensation reactance means and the ozone generator at a desired frequency both when the ozone generator is in a start state and in an operating state, including a compensation choke and a switch connected to said choke for switching said choke into or out of said resonant circuit in dependence on the state of the ozone generator; wherein the compensation reactance means has an inductance and said converter has a frequency selected so that the resonant frequency of said resonant circuit formed by said compensating reactance means and said ozone generator lies below the operating frequency of said converter in all operating conditions of the converter.

Claim 2

Independent Claim 201 words

A device for the generation of ozone, comprising: a high voltage transformer having a primary winding and a secondary winding; a converter for supplying a square wave current of variable amplitude and of variable frequency to said primary winding; an ozone generator connected across the secondary winding of said high voltage transformer, including a pair of electrodes separated by a solid dielectric and a gas path; and variable compensation reactance means connected across a selected of the primary and secondary windings of said transformer for maintaining a resonant frequency of a resonant circuit including the compensation reactance means and the ozone generator at a desired frequency both when the ozone generator is in a start state and in an operating state, including a compensation choke and a switch connected to said choke for switching said choke into or out of said resonant circuit in dependence on the state of the ozone generator; wherein the compensation reactance means has an inductance and said converter has a frequency selected so that the resonant frequency of said resonant circuit formed by said compensating reactance means and said ozone generator lies below the operating frequency of said converter in all operating conditions of the converter.

Claim 3

Dependent Claim 22 words

Device as claimed in claim 1, wherein the compensation choke is connected in parallel to the secondary winding of the high-voltage transformer.

Claim 4

Dependent Claim 67 words

Device as claimed in claim 2, wherein the inductance of the compensation choke is selected so that it complies with the following approximate formula: ##EQU2## where U eff denotes the voltage at the ozone generator, P W denotes the power at the ozone generator, f denotes the frequency of the supply current and k denotes an ozone generator-specific, essentially P w -dependent value between 0.5 and 1.5.

Claim 5

Dependent Claim 35 words

Device as claimed in claims 2 or 3, wherein the inductance of the compensation choke is selected dependent on the size of the ozone generator and lies between the values 10 μH and 10 H.

Claim 6

Dependent Claim 22 words

Device as claimed in claim 1, wherein the compensation choke is connected in parallel to the primary winding of the high-voltage transformer.

Claim 7

Dependent Claim 75 words

Device as claimed in claim 5, wherein the inductance of the compensation choke is selected so that it complies with the following approximate formula: ##EQU3## where w denotes the high-voltage side to low-voltage side winding ratio of the high-voltage transformer, P W denotes the power of the ozone generator, f denotes the frequency of the supply current from the converter and k denotes an ozone generator-specific essentially P W -dependent value between 0.5 and 1.5.

Claim 8

Dependent Claim 50 words

Device as claimed in claim 1, wherein when said compensation choke is connected across said primary winding, said compensation choke has an inductance smaller by a factor of w 2 than when said compensation choke is connected across said secondary winding, where w is the turns ratio of said transformer.

Claim 9

Dependent Claim 35 words

Device as claimed in claim 1, comprising: means for determination of the current in the converter; and means for decreasing the frequency of the output current of said converter approximately proportionally to its output current.

Claim 10

Dependent Claim 33 words

Device as claimed in claim 1, wherein said compensation reactance means comprises: a further choke capable of being switched into the circuit in series with the compensation choke by means of said switch.

Claim 11

Dependent Claim 24 words

Device as claimed in claim 1, comprising: parallel condensers capable of being switched into the circuit between the converter output and the ozone generator.

Claim 12

Dependent Claim 16 words

Device as claimed in claim 1, comprising: means for switching the compensation choke into the circuit.

Claim 13

Independent Claim 143 words

A device for the generation of ozone, comprising: a high voltage transformer having a primary winding and a secondary winding; a converter for supplying a square wave current of variable amplitude and of variable frequency to said primary winding; an ozone generator connected across the secondary winding of said high voltage transformer, including a pair of electrodes separated by a solid dielectric and a gas path; and a compensation choke connected across a selected of the primary and second windings of said transformer; wherein the compensation choke has an inductance and said converter has a frequency selected so that a resonant frequency of a resonant circuit formed by said compensating choke and said ozone generator lies below the operating frequency of said converter in all operating conditions of the converter; wherein the compensation choke has a current-dependent inductance and comprises an Isthmus choke.

Claim 14

Independent Claim 143 words

A device for the generation of ozone, comprising: a high voltage transformer having a primary winding and a secondary winding; a converter for supplying a square wave current of variable amplitude and of variable frequency to said primary winding; an ozone generator connected across the secondary winding of said high voltage transformer, including a pair of electrodes separated by a solid dielectric and a gas path; and a compensation choke connected across a selected of the primary and second windings of said transformer; wherein the compensation choke has an inductance and said converter has a frequency selected so that a resonant frequency of a resonant circuit formed by said compensating choke and said ozone generator lies below the operating frequency of said converter in all operating conditions of the converter; wherein the compensation choke has a current-dependent inductance and comprises an Isthmus choke.

Claim 15

Dependent Claim 145 words

A process for the generation of ozone implemented using an ozone generator having two electrodes connected across a secondary winding of a high voltage transformer and a solid dielectric and a gas path between the two electrodes, wherein a converter supplies a square wave current of variable amplitude and variable frequency to a primary winding of the high voltage transformer, and a compensation choke is connected across at lease a selected one of the windings of the high voltage transformer, comprising: selecting an inductance for said compensating choke and an operating frequency of said converter such that a resonance frequency of a resonating circuit formed by the ozone generator and the compensation choke lies below the operating frequency of the converter under all operating conditions of the converter; and controlling the frequency of the output current of the converter in dependence on the output current.

Claim 16

Dependent Claim 145 words

A process for the generation of ozone implemented using an ozone generator having two electrodes connected across a secondary winding of a high voltage transformer and a solid dielectric and a gas path between the two electrodes, wherein a converter supplies a square wave current of variable amplitude and variable frequency to a primary winding of the high voltage transformer, and a compensation choke is connected across at lease a selected one of the windings of the high voltage transformer, comprising: selecting an inductance for said compensating choke and an operating frequency of said converter such that a resonance frequency of a resonating circuit formed by the ozone generator and the compensation choke lies below the operating frequency of the converter under all operating conditions of the converter; and controlling the frequency of the output current of the converter in dependence on the output current.

Claim 17

Dependent Claim 31 words

Process as claimed in claim 13, wherein, in a start phase of the converter, the frequency of the converter is increased by approximately 50% as compared with a normal operating phase.

Claim 18

Dependent Claim 32 words

Process as claimed in claim 13, wherein, in a normal operating phase of the converter with a power factor cos Ψ>0.6, the frequency of the converter is reduced with increasing output current.

Claim 19

Dependent Claim 24 words

Process as claimed in claim 13, wherein that the converter is started wigh a fundamental current between 1/100 and 1/30 of the rated current.

Claim 20

Dependent Claim 30 words

Process as claimed in claim 13, comprising: connecting a further choke in series to the compensation choke before starting the converter; and short-circuiting said further choke in an operating phase.

Claim 21

Dependent Claim 47 words

Process as claimed in claim 13, comprising: switching at least one parallel condenser into the circuit across the secondary winding of the high-voltage transformer before starting the converter; and switching out said at least one condenser of the circuit again in an operating phase of the converter.

Claim 22

Dependent Claim 49 words

Process as claimed in claim 13, comprising: switching the compensation choke out of the circuit in a start phase of the converter; and switching the compensation choke into the circuit across the selected winding of the high voltage transformer only after an operating phase of the converter is reached.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1991-12-13	1992-06-13	1992-12-13	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1995-12-13	1996-06-13	1996-12-13	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1999-12-13	2000-06-13	2000-12-13	$7700.00	Window Closed / Lapsed

Device for the generation of ozone and a process for its operation

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