US3789229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Welding control circuit and method
Assignee: Mcculloch Corp
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Filing: 1972-06-05
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Granted: 1974-01-29
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Expires: 1992-06-05
Abstract
Abstract A voltage regulator and method are utilized in an automatic throttle control for an internal combustion engine driven inductor alternator. An SCR in series with the load is biased to conduct on successive positive half-cycles of a rectified a.c. input voltage. The SCR conductive bias is opposed responsively to the load voltage so that the average load voltage is a function of the number of complete pulses of the source in which the SCR conducts during a given time period. A hold-off circuit is provided to prevent SCR conduction during welding.
Inventors
- 👤 R Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:41
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/14; H02P9/26; H02P9/30; H02P9/305
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
89 words
A method of automatically controllling the energization of the throttle solenoid of an internal combustion engine driving an inductive alternator comprising the steps of: a. applying current from the alternator to an SCR in series with the throttle solenoid; b. biasing the SCR to conduct during like half-cycles of the alternator to supply current from the alternator to the throttle solenoid; c. sensing the voltage across the throttle solenoid; and d. maintaining the solenoid voltage by opposing the conduction biasing of the SCR responsively to the sensed solenoid voltage.
Claim 2
Independent Claim
89 words
A method of automatically controllling the energization of the throttle solenoid of an internal combustion engine driving an inductive alternator comprising the steps of: a. applying current from the alternator to an SCR in series with the throttle solenoid; b. biasing the SCR to conduct during like half-cycles of the alternator to supply current from the alternator to the throttle solenoid; c. sensing the voltage across the throttle solenoid; and d. maintaining the solenoid voltage by opposing the conduction biasing of the SCR responsively to the sensed solenoid voltage.
Claim 3
Dependent Claim
26 words
The method of claim 1 including the further steps of sensing the striking of a welding arc and inhibiting the conduction of the SCR responsively thereto.
Claim 4
Dependent Claim
31 words
The method of claim 1 including the further step of rectifying the output voltage of the alternator and energizing the SCR and the throttle solenoid with the rectified alternator output voltage.
Claim 5
Dependent Claim
23 words
The method of claim 1 wherein the SCR is biased into conduction and into non-conduction for substantially complete half-cycles of the alternator voltage.
Claim 6
Dependent Claim
21 words
The method of claim 1 wherein the combustion bias and conduction-opposing bias are applied to the trigger electrode of the SCR.
Claim 7
Dependent Claim
76 words
A welder comprising: an inductive alternator; an internal combustion engine drivingly connected to said alternator, said engine having a throttle biased into an open position; means responsive to alternator voltage for actuating said throttle to an idle position; means for regulating the alternator voltage applied to said throttle activating means to a substantially constant value; and, means responsive to alternator current to override said throttle actuation means whereby said throttle is returned to said open position.
Claim 8
Dependent Claim
76 words
A welder comprising: an inductive alternator; an internal combustion engine drivingly connected to said alternator, said engine having a throttle biased into an open position; means responsive to alternator voltage for actuating said throttle to an idle position; means for regulating the alternator voltage applied to said throttle activating means to a substantially constant value; and, means responsive to alternator current to override said throttle actuation means whereby said throttle is returned to said open position.
Claim 9
Independent Claim
86 words
A method of controlling the throttle solenoid of an internal combustion engine driving an inductive alternator comprising the steps of: a. biasing the engine throttle into an open position; b. energizing the throttle solenoid with alternator voltage to hold the throttle in the idle position; c. Regulating the throttle solenoid energization voltage to a substantially constant value; and, d. overriding throttle solenoid energization responsively to the alternator current to de-energize the throttle solenoid, thereby permitting the throttle bias to return the throttle to the open position.
Claim 10
Independent Claim
86 words
A method of controlling the throttle solenoid of an internal combustion engine driving an inductive alternator comprising the steps of: a. biasing the engine throttle into an open position; b. energizing the throttle solenoid with alternator voltage to hold the throttle in the idle position; c. Regulating the throttle solenoid energization voltage to a substantially constant value; and, d. overriding throttle solenoid energization responsively to the alternator current to de-energize the throttle solenoid, thereby permitting the throttle bias to return the throttle to the open position.
Claim 11
Dependent Claim
21 words
The method of claim 7 including the step of delaying the overriding of the throttle energization means by a predetermined amount.
Claim 12
Dependent Claim
26 words
The welder of claim 6 wherein said alternator current responsive means includes means for delaying the response of said throttle energization means by a predetermined amount.
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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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |