US3714547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage regulation circuit
Assignee: Eastman Kodak Co
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Filing: 1971-07-16
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Granted: 1973-01-30
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Expires: 1991-07-16
Abstract
Abstract A voltage regulation circuit for maintaining the RMS voltage supplied to a load substantially constant compared to the RMS line voltage. A triac connected in series with an AC load is gated to conduction for more than 180* but less than 360* of each cycle by means of a trigger circuit including an operational amplifier which sums the voltage developed across a capacitor during the first half cycle of the AC input voltage with a reference voltage to produce a varying output voltage which controls the length of time that the triac conducts during the second half cycle and during the next succeeding first half cycle of the input signal.
Inventors
- 👤 T Ross
- 👤 J Youngman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:44
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/40; G05F1/44; G05F1/45; G05F1/455; G05F1/445
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
370 words
A regulation circuit comprising: input circuit means connectable to an AC signal source; output circuit means connectable to an AC load; bidirectional current carrying means connected between said input circuit means and said output circuit means, said current carrying means being switchable in a first mode between a nonconductive state and a conductive state to carry current in a first conduction direction during a first half-cycle of an AC input signal and being switchable in a second mode between a non-conductive state and a conductive state to carry current in a second conduction direction during a second Half-cycle of said input signal; control means connected to said current carrying means for selectively causing said current carrying means to switch between a nonconductive state and a conductive state in either of said first or second modes; operational amplifier means having an output terminal connected to said control means and having an input terminal, means connected to said input terminal of said operational amplifier means for providing a reference voltage; means connected to said input circuit means and to said input terminal of said operational amplifier means for developing a sample voltage proportional to the input voltage during the first half-cycle of an AC input signal; said operational amplifier means summing said reference voltage and said sample voltage during the second half-cycle of said AC input signal to produce at said amplifier means output terminal a varying output signal which in said second mode causes said control circuit means to switch said current carrying means between the nonconductive state and the conductive state at a conduction angle which is a function of the sum of said reference voltage and said sample voltage, such that said current carrying means carries current in said second conduction direction during a portion only of said second half-cycle of said AC input signal and which in said first mode causes said control circuit means to switch said current carrying means between said nonconductive state and said conductive state at the beginning of the next succeeding first half-cycle of said AC input signal, such that said current carrying means carries current in said first conduction direction during the entire next succeeding first half-cycle of said AC input signal.
Claim 2
Dependent Claim
370 words
A regulation circuit comprising: input circuit means connectable to an AC signal source; output circuit means connectable to an AC load; bidirectional current carrying means connected between said input circuit means and said output circuit means, said current carrying means being switchable in a first mode between a nonconductive state and a conductive state to carry current in a first conduction direction during a first half-cycle of an AC input signal and being switchable in a second mode between a non-conductive state and a conductive state to carry current in a second conduction direction during a second Half-cycle of said input signal; control means connected to said current carrying means for selectively causing said current carrying means to switch between a nonconductive state and a conductive state in either of said first or second modes; operational amplifier means having an output terminal connected to said control means and having an input terminal, means connected to said input terminal of said operational amplifier means for providing a reference voltage; means connected to said input circuit means and to said input terminal of said operational amplifier means for developing a sample voltage proportional to the input voltage during the first half-cycle of an AC input signal; said operational amplifier means summing said reference voltage and said sample voltage during the second half-cycle of said AC input signal to produce at said amplifier means output terminal a varying output signal which in said second mode causes said control circuit means to switch said current carrying means between the nonconductive state and the conductive state at a conduction angle which is a function of the sum of said reference voltage and said sample voltage, such that said current carrying means carries current in said second conduction direction during a portion only of said second half-cycle of said AC input signal and which in said first mode causes said control circuit means to switch said current carrying means between said nonconductive state and said conductive state at the beginning of the next succeeding first half-cycle of said AC input signal, such that said current carrying means carries current in said first conduction direction during the entire next succeeding first half-cycle of said AC input signal.
Claim 3
Dependent Claim
370 words
A regulation circuit comprising: input circuit means connectable to an AC signal source; output circuit means connectable to an AC load; bidirectional current carrying means connected between said input circuit means and said output circuit means, said current carrying means being switchable in a first mode between a nonconductive state and a conductive state to carry current in a first conduction direction during a first half-cycle of an AC input signal and being switchable in a second mode between a non-conductive state and a conductive state to carry current in a second conduction direction during a second Half-cycle of said input signal; control means connected to said current carrying means for selectively causing said current carrying means to switch between a nonconductive state and a conductive state in either of said first or second modes; operational amplifier means having an output terminal connected to said control means and having an input terminal, means connected to said input terminal of said operational amplifier means for providing a reference voltage; means connected to said input circuit means and to said input terminal of said operational amplifier means for developing a sample voltage proportional to the input voltage during the first half-cycle of an AC input signal; said operational amplifier means summing said reference voltage and said sample voltage during the second half-cycle of said AC input signal to produce at said amplifier means output terminal a varying output signal which in said second mode causes said control circuit means to switch said current carrying means between the nonconductive state and the conductive state at a conduction angle which is a function of the sum of said reference voltage and said sample voltage, such that said current carrying means carries current in said second conduction direction during a portion only of said second halfcycle of said AC input signal and which in said first mode causes said control circuit means to switch said current carrying means between said nonconductive state and said conductive state at the beginning of the next succeeding first half-cycle of said AC input signal, such that said current carrying means carries current in said first conduction direction during the entire next succeeding first half-cycle of said AC input signal.
Claim 4
Dependent Claim
370 words
A regulation circuit comprising: input circuit means connectable to an AC signal source; output circuit means connectable to an AC load; bidirectional current carrying means connected between said input circuit means and said output circuit means, said current carrying means being switchable in a first mode between a nonconductive state and a conductive state to carry current in a first conduction direction during a first half-cycle of an AC input signal and being switchable in a second mode between a non-conductive state and a conductive state to carry current in a second conduction direction during a second Half-cycle of said input signal; control means connected to said current carrying means for selectively causing said current carrying means to switch between a nonconductive state and a conductive state in either of said first or second modes; operational amplifier means having an output terminal connected to said control means and having an input terminal, means connected to said input terminal of said operational amplifier means for providing a reference voltage; means connected to said input circuit means and to said input terminal of said operational amplifier means for developing a sample voltage proportional to the input voltage during the first half-cycle of an AC input signal; said operational amplifier means summing said reference voltage and said sample voltage during the second half-cycle of said AC input signal to produce at said amplifier means output terminal a varying output signal which in said second mode causes said control circuit means to switch said current carrying means between the nonconductive state and the conductive state at a conduction angle which is a function of the sum of said reference voltage and said sample voltage, such that said current carrying means carries current in said second conduction direction during a portion only of said second halfcycle of said AC input signal and which in said first mode causes said control circuit means to switch said current carrying means between said nonconductive state and said conductive state at the beginning of the next succeeding first half-cycle of said AC input signal, such that said current carrying means carries current in said first conduction direction during the entire next succeeding first half-cycle of said AC input signal.
Claim 5
Dependent Claim
18 words
The regulation circuit of claim 1 wherein said bidirectional current carrying means includes a triac having a gate.
Claim 6
Dependent Claim
17 words
The regulation circuit of claim 2 wherein said control means includes a transistor connected to said gate.
Claim 7
Dependent Claim
17 words
The regulation circuit of claim 3 wherein said means for providing a reference voltage includes a diode.
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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) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |