Patent JPS63310101A successfully refreshed from Google Patents.
US3889178A
Expired / Lapsed
US
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Welding control circuit and method
Assignee: Mcculloch Corp
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Filing: 1973-07-23
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Granted: 1975-06-10
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Expires: 1993-07-23
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
- 👤 Robert V Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:26
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/40; G05F1/44; G05F1/445
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
112 words
A voltage regulator comprising: a variable voltage source of current pulses; switch means and a load impedance connected in series with said source; means for sensing the voltage across said load impedance; and, means for maintaining load voltage at a substantially constant value notwithstanding variations in the voltage of said source of current pulses by normally biasing said switch means into conduction for a predetermined portion of all of said pulses at the terminal end thereof and by opposing the biasing of said switch means sufficient to thereby bias said switch means out of conduction for said predetermined portion of less than all of said pulses in response to said sensing means.
Claim 2
Dependent Claim
112 words
A voltage regulator comprising: a variable voltage source of current pulses; switch means and a load impedance connected in series with said source; means for sensing the voltage across said load impedance; and, means for maintaining load voltage at a substantially constant value notwithstanding variations in the voltage of said source of current pulses by normally biasing said switch means into conduction for a predetermined portion of all of said pulses at the terminal end thereof and by opposing the biasing of said switch means sufficient to thereby bias said switch means out of conduction for said predetermined portion of less than all of said pulses in response to said sensing means.
Claim 3
Dependent Claim
18 words
The voltage regulator of claim 1 wherein said load impedance includes an inductor and a diode in parallel.
Claim 4
Dependent Claim
18 words
The voltage regulator of claim 1 wherein said load impedance includes a capacitor and a diode in series.
Claim 5
Dependent Claim
25 words
The voltage regulator of claim 1 wherein said source of current pulses comprises a source of alternating current in series with a full wave rectifier.
Claim 6
Dependent Claim
33 words
The voltage regulator of claim 1 wherein said means for biasing comprises a voltage divider network connected in parallel across said switch means and said load impedance, said network including a Zener diode.
Claim 7
Dependent Claim
28 words
The voltage regulator of claim 1 including means for selectively modifying the bias provided by said means for biasing to thereby modify the level of the regulated voltage.
Claim 8
Dependent Claim
37 words
The voltage regulator of claim 1 wherein the switch means is an SCR and wherein the trigger electrode of said SCR is connected to the cathode thereof through a circuit element having a predetermined value of resistance.
Claim 9
Dependent Claim
52 words
The voltage regulator of claim 7 wherein said means for biasing comprises a voltage divider network connected in parallel across said SCR and said load impedance, said network including a Zener diode; and, wherein said source of current pulses comprises a source of alternating current in series with a full wave rectifier.
Claim 10
Independent Claim
123 words
A method of voltage regulation comprising the steps of: a. applying a series of current pulses to a switch and a load impedance in series, the series of current pulses being applied at a voltage variable in Rms value; b. biasing the switch to conduct for a predetermined portion of each of the current pulses at the terminal end thereof; c. sensing load voltage; and, d. maintaining a load voltage within predetermined limits independent of the voltage at which the series of current pulses are applied by opposing for the same predetermined portion of some of the current pulses the condution bias of the switch responsively to the sensed load voltage sufficiently to prevent the conduction of the switch for that predetermined portion.
Claim 11
Independent Claim
123 words
A method of voltage regulation comprising the steps of: a. applying a series of current pulses to a switch and a load impedance in series, the series of current pulses being applied at a voltage variable in Rms value; b. biasing the switch to conduct for a predetermined portion of each of the current pulses at the terminal end thereof; c. sensing load voltage; and, d. maintaining a load voltage within predetermined limits independent of the voltage at which the series of current pulses are applied by opposing for the same predetermined portion of some of the current pulses the condution bias of the switch responsively to the sensed load voltage sufficiently to prevent the conduction of the switch for that predetermined portion.
Claim 12
Dependent Claim
34 words
The method of claim 9 wherein the switch is biased to conduct by a stable reference voltage and including the further step of selectively varying the load voltage by varying the stable reference voltage.
Claim 13
Dependent Claim
31 words
The method of claim 9 wherein the switch is an SCR and wherein the conduction effecting bias and the conduction opposing bias are applied to the trigger electrode of the SCR.
Claim 14
Dependent Claim
91 words
A welder comprising: a source of alternating current; a pair of electrical conductors each connected to said source and each adapted to be connected to one of a pair of welding electrodes; a capacitor electrically connected into one of said pair of electrical conductors; an SCR and an inductor in series across said electrical conductors; means for sensing the voltage across said inductor; means for conductively biasing said SCR during like half-cycles of current from said source; and, means responsive to said inductor voltage sensing means for opposing said conductive bias.
Claim 15
Dependent Claim
91 words
A welder comprising: a source of alternating current; a pair of electrical conductors each connected to said source and each adapted to be connected to one of a pair of welding electrodes; a capacitor electrically connected into one of said pair of electrical conductors; an SCR and an inductor in series across said electrical conductors; means for sensing the voltage across said inductor; means for conductively biasing said SCR during like half-cycles of current from said source; and, means responsive to said inductor voltage sensing means for opposing said conductive bias.
Claim 16
Dependent Claim
22 words
The welder of claim 12 wherein the frequency of the current from said source is responsive to the voltage across said inductor.
Claim 17
Dependent Claim
19 words
The welder of claim 12 wherein the voltage of said source is responsive to the voltage across said inductor.
Claim 18
Dependent Claim
21 words
The welder of claim 12 including means responsive to current through said electrical conductors for preventing the conduction of said SCR.
Claim 19
Dependent Claim
49 words
The welder of claim 15 wherein said conduction-preventing means includes: means for sensing the voltage across said capacitor; current limiting means; and, delay means for prolonging the prevention of the conduction of said SCR for a predetermined time period subsequent to the loss of current through said electrical conductors.
Claim 20
Dependent Claim
30 words
The welder of claim 12 including a diode connected across said inductor and wherein the conduction bias and the conduction-opposing bias are applied to the trigger electrode of said SCR.
Claim 21
Dependent Claim
21 words
The welder of claim 12 including full wave rectifier means for connecting said SCR and said inductor across said electrical conductors.
Claim 22
Dependent Claim
31 words
The welder of claim 12 wherein said conduction biasing means includes a voltage divider network connected in parallel across said SCR and said load impedance, said network including a Zener diode.
Claim 23
Dependent Claim
19 words
The welder of claim 12 including means for selectively modifying the bias provided by said SCR conduction biasing means.
References Cited (Backward Citations)
US3339114A
Cited
US3506852A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |