US3784838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid state frequency converter for corona generator
Assignee: Purification Sciences Inc
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Filing: 1971-08-25
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Granted: 1974-01-08
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Expires: 1991-08-25
Abstract
Abstract A method and apparatus for converting low frequency current to high frequency current and for applying the high frequency current to the electrodes of a corona generator. The frequency converter includes a rectifier circuit, and a chopping circuit. The chopping circuit includes an SCR and a firing circuit connected to the SCR. The chopping circuit does not require a conventional shut-off circuit. The SCR is connected to an ozone generator through a transformer and automatically shuts off.
Inventors
- 👤 F Lowther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:20
CPC Classifications
C; C01; C01B; C01B13/00; C01B13/10; C01B13/11; C01B13/115; A; A61; A61L; A61L2/00; A61L2/16; A61L2/20; A61L2/202; H; H01; H01T; H01T19/00; H01T23/00; H02; H02M; H02M5/00; H02M5/40; H02M5/42; H02M5/44; H02M5/443; H02M5/45
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
160 words
An apparatus comprising: a. a corona generator comprising at least one corona generating cell including a pair of spaced-apart electrodes and a layer of dielectric material therebetween; b. a frequency converter circuit; c. a transformer having a primary winding connected to said frequency converter circuit and a secondary winding connected to said corona generator; and d. said frequency converter circuit being connected to said corona generator through said transformer for supplying higher frequency current to said corona generator from a lower frequency AC power source, said frequency converter circuit comprising: 1. a rectifier circuit for rectifying current from an AC power source, and 2. a chopping circuit connected to said rectifier circuit for chopping rectified current, i. said chopping circuit consisting essentially of an SCR, connected in series with said primary winding of said transformer, and a firing circuit connected to the gate of said SCR, said SCR being shut-off by said connection to said corona generator through said transformer.
Claim 2
Independent Claim
160 words
An apparatus comprising: a. a corona generator comprising at least one corona generating cell including a pair of spaced-apart electrodes and a layer of dielectric material therebetween; b. a frequency converter circuit; c. a transformer having a primary winding connected to said frequency converter circuit and a secondary winding connected to said corona generator; and d. said frequency converter circuit being connected to said corona generator through said transformer for supplying higher frequency current to said corona generator from a lower frequency AC power source, said frequency converter circuit comprising: 1. a rectifier circuit for rectifying current from an AC power source, and 2. a chopping circuit connected to said rectifier circuit for chopping rectified current, i. said chopping circuit consisting essentially of an SCR, connected in series with said primary winding of said transformer, and a firing circuit connected to the gate of said SCR, said SCR being shut-off by said connection to said corona generator through said transformer.
Claim 3
Dependent Claim
56 words
a chopping circuit connected to said rectifier circuit for chopping rectified current, i. said chopping circuit consisting essentially of an SCR, connected in series with said primary winding of said transformer, and a firing circuit connected to the gate of said SCR, said SCR being shut-off by said connection to said corona generator through said transformer.
Claim 4
Dependent Claim
56 words
a chopping circuit connected to said rectifier circuit for chopping rectified current, i. said chopping circuit consisting essentially of an SCR, connected in series with said primary winding of said transformer, and a firing circuit connected to the gate of said SCR, said SCR being shut-off by said connection to said corona generator through said transformer.
Claim 5
Dependent Claim
13 words
The apparatus according to claim 1 wherein said transformer is a step-up transformer.
Claim 6
Dependent Claim
14 words
The apparatus according to claim 1 wherein said transformer has a one-to-one turns ratio.
Claim 7
Dependent Claim
38 words
The apparatus according to claim 1 wherein said corona generator includes a plurality of corona generating cells, each cell comprising a pair of spaced-apart electrodes defining a corona generating chamber therebetween, each chamber containing a fluid reactant therein.
Claim 8
Dependent Claim
23 words
The apparatus according to claim 4 wherein said corona generator is an ozone generator and said fluid reactant is an oxygen containing gas.
Claim 9
Dependent Claim
23 words
The apparatus according to claim 1 wherein said firing circuit is a low power circuit supplying approximately 10 volt pulses to said SCR.
Claim 10
Dependent Claim
26 words
The apparatus according to claim 6 including a variable resistor in said firing circuit for varying the frequency of the firing pulses applied to said SCR.
Claim 11
Dependent Claim
23 words
The apparatus according to claim 1 wherein said firing circuit includes means for varying the frequency of firing pulses applied to said SCR.
Claim 12
Dependent Claim
29 words
The apparatus according to claim 1 including a step-up transformer connected to said rectifier circuit for increasing the voltage of current from said power source before it is rectified.
Claim 13
Dependent Claim
21 words
The apparatus according to claim 9 wherein said transformer connecting said SCR to said corona generator has a one-to-one turns ratio.
Claim 14
Dependent Claim
74 words
The apparatus according to claim 1 wherein said corona generator is an ozone generator comprising: a pair of flat, adjacent, parallel, spaced-apart electrodes defining a corona discharge chamber adapted to contain an oxygen containing gas between facing, internal surfaces of said electrodes, at least one of said electrodes having a fired-On coating of porcelain enamel dielectric material on its internal surface, and the total thickness of said coating being less than about 40 mils.
Claim 15
Dependent Claim
27 words
The apparatus according to claim 11 wherein said pair of electrodes forms a corona generating cell and wherein said corona generator includes a plurality of said cells.
Claim 16
Dependent Claim
39 words
The apparatus according to claim 12 wherein each of said electrodes has a fired-on coating of porcelain enamel dielectric material on its internal surface, and wherein the total thickness of said two coatings is less than about 40 mils.
Claim 17
Dependent Claim
23 words
The apparatus according to claim 13 wherein the air gap between said electrodes of each cell is between about 5 and 100 mils.
Claim 18
Dependent Claim
24 words
The apparatus according to claim 14 wherein each of said electrodes includes an external surface in heat exchange relationship with a gaseous cooling means.
Claim 19
Dependent Claim
33 words
The apparatus according to claim 15 including means sealing said corona generating chamber of each cell from ambient at chamber pressures in the range of from at least about 0 to 30 psia.
Claim 20
Dependent Claim
30 words
The apparatus according to claim 16 including means for feeding an oxygen-containing gas into each of said corona reaction chambers and for feeding ozone out of each of said chambers.
Claim 21
Dependent Claim
15 words
The apparatus according to claim 1 wherein said chopping circuit includes only a single SCR.
Claim 22
Dependent Claim
75 words
In a corona generating system including a corona generator, and an AC power supply, the improvement comprising: means for rectifying AC current from said power supply: means for chopping rectified current from said rectifying means, consisting essentially of: a transformer, said corona generator being connected to the secondary winding of said transformer; an SCR connected in series with the primary winding of said transformer; and a firing circuit connected to the gate of said SCR.
Claim 23
Dependent Claim
75 words
In a corona generating system including a corona generator, and an AC power supply, the improvement comprising: means for rectifying AC current from said power supply: means for chopping rectified current from said rectifying means, consisting essentially of: a transformer, said corona generator being connected to the secondary winding of said transformer; an SCR connected in series with the primary winding of said transformer; and a firing circuit connected to the gate of said SCR.
Claim 24
Independent Claim
104 words
An apparatus comprising: a. a corona generator comprising at least one corona generating cell including a pair of spaced-apart electrodes and a layer of dielectric material therebetween b. an inverter circuit for supplying alternating current from a DC source; c. a transformer having a primary winding connected to said inverter circuit, and a secondary winding connected to said corona generator, d. said inverter circuit consisting essentially of an SCR, connected in series with said primary winding of said transformer, and a firing circuit connected to the gate of said SCR, said SCR being shut-off by said connection to said corona generator through said transformer.
Claim 25
Independent Claim
104 words
An apparatus comprising: a. a corona generator comprising at least one corona generating cell including a pair of spaced-apart electrodes and a layer of dielectric material therebetween b. an inverter circuit for supplying alternating current from a DC source; c. a transformer having a primary winding connected to said inverter circuit, and a secondary winding connected to said corona generator, d. said inverter circuit consisting essentially of an SCR, connected in series with said primary winding of said transformer, and a firing circuit connected to the gate of said SCR, said SCR being shut-off by said connection to said corona generator through said transformer.
Claim 26
Dependent Claim
15 words
The apparatus according to claim 20 wherein said inverter circuit includes only a single SCR
Claim 27
Dependent Claim
14 words
The apparatus according to claim 20 wherein said transformer has a one-to-one turns ratio.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |