Patent US5877952A successfully refreshed from Google Patents.
US5877952A
Expired / Lapsed
US
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Power supply apparatus with initial arcing sustaining circuit
Assignee: SANSAH ELECTRIC MANUFACTURING COMPANY Ltd
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Filing: 1997-10-21
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Granted: 1999-03-02
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Expires: 2017-10-21
Abstract
Abstract Power supply apparatus includes a converter which converts a commercial AC voltage into a DC voltage. An inverter converts the DC voltage into a high frequency voltage. The high frequency voltage is voltage-transformed by a transformer, and then rectified and smoothed by a rectifier and a smoothing reactor into a DC voltage. This DC voltage is applied between a workpiece and a torch. A high frequency voltage generator generates a high frequency voltage and applies it to a primary winding of a coupling transformer. A boosted high frequency voltage is induced in a first secondary winding and applied between the workpiece and the torch, so that arcing is initiated. The coupling transformer includes a second secondary winding in which another high frequency voltage is induced. The high frequency voltage induced in the second secondary winding is converted into a DC voltage by a diode and a smoothing capacitor for application between the workpiece and the torch, so that the arcing is sustained.
Inventors
- 👤 Haruo Moriguchi
- 👤 Kenzo Danjo
- 👤 Shigeru Okamoto
- 👤 Atsushi Kinoshita
- 👤 Takashi Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:28
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/06; B23K9/067; B23K9/0672; B23K9/0678
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
178 words
A power supply apparatus comprising: inverter means for converting a first DC voltage into a high frequency voltage; transformer means for voltage-transforming said high frequency voltage; first converting means for converting the voltage-transformed high frequency voltage into a second DC voltage; two output terminals between which the second DC voltage from said first converting means is applied; a high frequency voltage superposing path coupled between said output terminals; high frequency voltage generating means; a coupling transformer having a primary winding and a first secondary winding, said primary winding receiving a high frequency voltage from said high frequency voltage generating means, said first secondary winding being coupled in said high frequency voltage superposing path; voltage boosting means for developing a boosted high frequency voltage in accordance with the high frequency voltage generated by said high frequency voltage generating means; and second converting means associated with said voltage boosting means for converting the boosted high frequency voltage into a third DC voltage that is higher than said second DC voltage and applying the third DC voltage between said output terminals.
Claim 2
Dependent Claim
178 words
A power supply apparatus comprising: inverter means for converting a first DC voltage into a high frequency voltage; transformer means for voltage-transforming said high frequency voltage; first converting means for converting the voltage-transformed high frequency voltage into a second DC voltage; two output terminals between which the second DC voltage from said first converting means is applied; a high frequency voltage superposing path coupled between said output terminals; high frequency voltage generating means; a coupling transformer having a primary winding and a first secondary winding, said primary winding receiving a high frequency voltage from said high frequency voltage generating means, said first secondary winding being coupled in said high frequency voltage superposing path; voltage boosting means for developing a boosted high frequency voltage in accordance with the high frequency voltage generated by said high frequency voltage generating means; and second converting means associated with said voltage boosting means for converting the boosted high frequency voltage into a third DC voltage that is higher than said second DC voltage and applying the third DC voltage between said output terminals.
Claim 3
Dependent Claim
22 words
The power supply apparatus according to claim 1 wherein said voltage boosting means is a second secondary winding of said coupling transformer.
Claim 4
Dependent Claim
191 words
A power supply apparatus comprising: inverter means for converting a first DC voltage into a high frequency voltage; transformer means for voltage-transforming said high frequency voltage; first converting means for converting the voltage-transformed high frequency voltage into a second DC voltage; two output terminals between which the second DC voltage from said first converting means is applied; a high frequency voltage superposing path coupled between said output terminals; high frequency voltage generating means; a coupling transformer having a primary winding and a first secondary winding, said primary winding receiving a high frequency voltage from said high frequency voltage generating means, said first second winding being coupled in said high frequency voltage superposing path; voltage boosting means for developing a boosted high frequency voltage in accordance with the high frequency voltage generated by said high frequency voltage generating means; and second converting means associated with said voltage boosting means for converting the boosted high frequency voltage into a third DC voltage and applying the third DC voltage between said output terminals; wherein said high frequency voltage generating means stops providing the high frequency voltage when arc current flows between said output terminals.
Claim 5
Dependent Claim
191 words
A power supply apparatus comprising: inverter means for converting a first DC voltage into a high frequency voltage; transformer means for voltage-transforming said high frequency voltage; first converting means for converting the voltage-transformed high frequency voltage into a second DC voltage; two output terminals between which the second DC voltage from said first converting means is applied; a high frequency voltage superposing path coupled between said output terminals; high frequency voltage generating means; a coupling transformer having a primary winding and a first secondary winding, said primary winding receiving a high frequency voltage from said high frequency voltage generating means, said first second winding being coupled in said high frequency voltage superposing path; voltage boosting means for developing a boosted high frequency voltage in accordance with the high frequency voltage generated by said high frequency voltage generating means; and second converting means associated with said voltage boosting means for converting the boosted high frequency voltage into a third DC voltage and applying the third DC voltage between said output terminals; wherein said high frequency voltage generating means stops providing the high frequency voltage when arc current flows between said output terminals.
Claim 6
Dependent Claim
173 words
A power supply apparatus comprising: an inverter for converting a first DC voltage into a high frequency voltage; a transformer for voltage-transforming said high frequency voltage; a first converter for converting the voltage-transformed high frequency voltage into a second DC voltage; two output terminals between which the second DC voltage from said first converter is applied; a high frequency voltage superposing path coupled between said output terminals; a high frequency voltage generator; a coupling transformer having a primary winding and a first secondary winding, said primary winding receiving a high frequency voltage from said high frequency voltage generator, said first secondary winding being coupled in said high frequency voltage superposing path; a voltage booster for developing a boosted high frequency voltage in accordance with the high frequency voltage generated by said high frequency voltage generator; and a second converter associated with said voltage booster for converting the boosted high frequency voltage into a third DC voltage that is higher than the second DC voltage and applying the third voltage between said output terminals.
Claim 7
Dependent Claim
173 words
A power supply apparatus comprising: an inverter for converting a first DC voltage into a high frequency voltage; a transformer for voltage-transforming said high frequency voltage; a first converter for converting the voltage-transformed high frequency voltage into a second DC voltage; two output terminals between which the second DC voltage from said first converter is applied; a high frequency voltage superposing path coupled between said output terminals; a high frequency voltage generator; a coupling transformer having a primary winding and a first secondary winding, said primary winding receiving a high frequency voltage from said high frequency voltage generator, said first secondary winding being coupled in said high frequency voltage superposing path; a voltage booster for developing a boosted high frequency voltage in accordance with the high frequency voltage generated by said high frequency voltage generator; and a second converter associated with said voltage booster for converting the boosted high frequency voltage into a third DC voltage that is higher than the second DC voltage and applying the third voltage between said output terminals.
Claim 8
Dependent Claim
21 words
The power supply apparatus according to claim 4 wherein said voltage booster is a second secondary winding of said coupling transformer.
Claim 9
Dependent Claim
186 words
A power supply apparatus comprising: an inverter for converting a first DC voltage into a high frequency voltage; a transformer for voltage-transforming said high frequency voltage; a first converter for converting the voltage-transformed high frequency voltage into a second DC voltage; two output terminals between which the second DC voltage from said first converter is applied; a high frequency voltage superposing path coupled between said output terminals; a high frequency voltage generator; a coupling transformer having a primary winding and a first secondary winding, said primary winding receiving a high frequency voltage from said high frequency voltage generator, said first secondary winding being coupled in said high frequency voltage superposing path; a voltage booster for developing a boosted high frequency voltage in accordance with the high frequency voltage generated by said high frequency voltage generator; and a second converter associated with said voltage booster for converting the boosted high frequency voltage into a third DC voltage and applying the third DC voltage between said output terminals; wherein said high frequency voltage generator stops providing the high frequency voltage when arc current flows between said output terminals.
Claim 10
Dependent Claim
186 words
A power supply apparatus comprising: an inverter for converting a first DC voltage into a high frequency voltage; a transformer for voltage-transforming said high frequency voltage; a first converter for converting the voltage-transformed high frequency voltage into a second DC voltage; two output terminals between which the second DC voltage from said first converter is applied; a high frequency voltage superposing path coupled between said output terminals; a high frequency voltage generator; a coupling transformer having a primary winding and a first secondary winding, said primary winding receiving a high frequency voltage from said high frequency voltage generator, said first secondary winding being coupled in said high frequency voltage superposing path; a voltage booster for developing a boosted high frequency voltage in accordance with the high frequency voltage generated by said high frequency voltage generator; and a second converter associated with said voltage booster for converting the boosted high frequency voltage into a third DC voltage and applying the third DC voltage between said output terminals; wherein said high frequency voltage generator stops providing the high frequency voltage when arc current flows between said output terminals.
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