Patent US5229567A successfully refreshed from Google Patents.
US5229567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching control system for controlling an inverter of a spot resistance welding apparatus
Assignee: Honda Motor Co Ltd
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Filing: 1992-03-13
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Granted: 1993-07-20
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Expires: 2012-03-13
Abstract
Abstract A DC resistance welding apparatus includes a pair of welding electrodes for sandwiching workpieces to be welded therebetween and a circuit connected to the welding electrodes for supplying a welding current to said welding electrodes. The circuit includes a plurality of parallel-connected rectifying circuits each having a welding transformer and rectifying circuit. The circuit allows a large welding current to be supplied to workpieces, and makes the DC resistance welding apparatus small in size and light in weight.
Inventors
- 👤 Nobuo Kobayashi
- 👤 Fumitomo Takano
- 👤 Makoto Suzuki
- 👤 Hitoshi Saito
- 👤 Hidenori Koga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:34
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/24
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
107 words
A DC resistance welding apparatus comprising: a pair of welding electrodes for sandwiching workpieces to be welded therebetween; an inverter unit having semiconductors switchable into and out of operation for converting DC electric energy to AC electric energy; means for converting the AC electric energy to DC electric energy and applying the DC electric energy to said welding electrodes; a base driver for operating said semiconductors with switching currents higher than a continuous rating range; and a timer circuit for measuring a conduction time of the semiconductors and cutting of said switching currents, thereby rendering said semiconductors non-conductive, when the measured conduction time exceeds a predetermined time.
Claim 2
Dependent Claim
107 words
A DC resistance welding apparatus comprising: a pair of welding electrodes for sandwiching workpieces to be welded therebetween; an inverter unit having semiconductors switchable into and out of operation for converting DC electric energy to AC electric energy; means for converting the AC electric energy to DC electric energy and applying the DC electric energy to said welding electrodes; a base driver for operating said semiconductors with switching currents higher than a continuous rating range; and a timer circuit for measuring a conduction time of the semiconductors and cutting of said switching currents, thereby rendering said semiconductors non-conductive, when the measured conduction time exceeds a predetermined time.
Claim 3
Dependent Claim
98 words
A DC resistance welding apparatus according to claim 1, wherein said timer circuit comprises an oscillator for generating a pulsed signal having a frequency higher than the frequency of the AC electric energy, an AND gate having an input terminal supplied with said pulsed signal and an input terminal supplied with a signal corresponding to the AC electric energy, a presettable counter for counting a pulsed signal from said AND Gate and supplying a count signal to said base driver, and a setting unit for setting said presettable counter to a preset value corresponding to said predetermined time.
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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) | 1996-07-19 | 1997-01-18 | 1997-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-19 | 2001-01-18 | 2001-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-19 | 2005-01-18 | 2005-07-20 | $7700.00 | Window Closed / Lapsed |