US3746887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Condition responsive a. c. phase angle control circuitry
Assignee: Robertshaw US Holding Corp
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Filing: 1971-09-09
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Granted: 1973-07-17
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Expires: 1991-09-09
Abstract
Abstract A condition responsive A.C. phase angle control circuit is disclosed which comprises a gated control switch for a load and condition responsive circuitry governing operation of the control switch. The condition responsive control circuit comprises an A.C. condition sensing bridge and a triggerable device which provides positive going and negative going gating pulses to the control switch in response to bridge output signals. The triggerable device can be formed by an integrated circuit defining a programmable unijunction transistor circuit and an SCR circuit.
Inventors
- 👤 J Lorenz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:09
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/08; H02M1/088; H02M1/092; H02M5/00; H02M5/02; H02M5/04; H02M5/22; H02M5/25; H02M5/257; H02M5/2573
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
299 words
A condition responsive circuit for controlling the power supplied to a load from an A.C. power supply comprising: a. electronic switch means having power electrodes connected in series with the load and gate electrode means, said switch means capable of conduction during positive and negative power supply half cycles at variable power supply phase angles; b. an electronic gating circuit connected to said gate electrode means for providing positive going gate signals to said gate electrode means during positive power supply half cycles at phase angles dependent upon a sensed condition and negative going gate signals to said gate electrode means during negative power supply half cycles at phase angles dependent upon the sensed condition whereby the load is energizable through said switch means during positive and negative power supply half cycles at phase angles dependent upon the sensed condition, said gating circuit comprising: 1. condition responsive bridge circuit means having first and second branches connected in parallel with said switch means and supplied with alternating current from said power supply; 2. signal transmitting circuit means defining a signal transmitting circuit connected between the first brancH of said bridge circuit means and said gate electrode means, said signal transmitting circuit means further defining control electrode means connected to the second branch of said bridge means, said control electrode means controlling conductivity of said signal transmitting circuit whereby when the voltage applied to said control electrode means reaches a predetermined magnitude relative to the voltage applied to said signal transmitting circuit said signal transmitting circuit is rendered conductive to transmit a gate signal to said gate electrode means; 3. at least one of said bridge circuit means branches comprising a condition responsive impedance element for varying the alternating current impedance of said branch in response to a sensed condition; and,
Claim 2
Dependent Claim
299 words
A condition responsive circuit for controlling the power supplied to a load from an A.C. power supply comprising: a. electronic switch means having power electrodes connected in series with the load and gate electrode means, said switch means capable of conduction during positive and negative power supply half cycles at variable power supply phase angles; b. an electronic gating circuit connected to said gate electrode means for providing positive going gate signals to said gate electrode means during positive power supply half cycles at phase angles dependent upon a sensed condition and negative going gate signals to said gate electrode means during negative power supply half cycles at phase angles dependent upon the sensed condition whereby the load is energizable through said switch means during positive and negative power supply half cycles at phase angles dependent upon the sensed condition, said gating circuit comprising: 1. condition responsive bridge circuit means having first and second branches connected in parallel with said switch means and supplied with alternating current from said power supply; 2. signal transmitting circuit means defining a signal transmitting circuit connected between the first brancH of said bridge circuit means and said gate electrode means, said signal transmitting circuit means further defining control electrode means connected to the second branch of said bridge means, said control electrode means controlling conductivity of said signal transmitting circuit whereby when the voltage applied to said control electrode means reaches a predetermined magnitude relative to the voltage applied to said signal transmitting circuit said signal transmitting circuit is rendered conductive to transmit a gate signal to said gate electrode means; 3. at least one of said bridge circuit means branches comprising a condition responsive impedance element for varying the alternating current impedance of said branch in response to a sensed condition; and,
Claim 3
Dependent Claim
49 words
The circuit claimed in claim 1 wherein said signal transmitting circuit means comprises a PUT and an SCR, said PUT and SCR having gate electrodes connected to said second branch of said bridge circuit means, said phase shifting means connected in said first branch of said bridge circuit means.
Claim 4
Dependent Claim
95 words
signal transmitting circuit means defining a signal transmitting circuit connected between the first brancH of said bridge circuit means and said gate electrode means, said signal transmitting circuit means further defining control electrode means connected to the second branch of said bridge means, said control electrode means controlling conductivity of said signal transmitting circuit whereby when the voltage applied to said control electrode means reaches a predetermined magnitude relative to the voltage applied to said signal transmitting circuit said signal transmitting circuit is rendered conductive to transmit a gate signal to said gate electrode means;
Claim 5
Dependent Claim
95 words
signal transmitting circuit means defining a signal transmitting circuit connected between the first brancH of said bridge circuit means and said gate electrode means, said signal transmitting circuit means further defining control electrode means connected to the second branch of said bridge means, said control electrode means controlling conductivity of said signal transmitting circuit whereby when the voltage applied to said control electrode means reaches a predetermined magnitude relative to the voltage applied to said signal transmitting circuit said signal transmitting circuit is rendered conductive to transmit a gate signal to said gate electrode means;
Claim 6
Dependent Claim
31 words
at least one of said bridge circuit means branches comprising a condition responsive impedance element for varying the alternating current impedance of said branch in response to a sensed condition; and,
Claim 7
Dependent Claim
31 words
at least one of said bridge circuit means branches comprising a condition responsive impedance element for varying the alternating current impedance of said branch in response to a sensed condition; and,
Claim 8
Dependent Claim
49 words
The circuit claimed in claim 2 wherein said phase shifting means comprises a capacitor connected in series with said first branch of said bridge circuit means for causing the voltage waveform in said first branch to lag the voltage waveform in said second branch of said bridge circuit means.
Claim 9
Dependent Claim
38 words
means for shifting the phase of the alternating current voltage applied across one branch of said bridge circuit means relative to the phase of the alternating current voltage applied across said other branch of said bridge circuit means.
Claim 10
Dependent Claim
38 words
means for shifting the phase of the alternating current voltage applied across one branch of said bridge circuit means relative to the phase of the alternating current voltage applied across said other branch of said bridge circuit means.
Claim 11
Dependent Claim
27 words
A circuit as claimed in claim 2 further comprising voltage dropping impedance means connected in series between said power supply and said condition responsive bridge circuit means.
Claim 12
Dependent Claim
14 words
The circuit claimed in claim 1 wherein said A.C. switch means comprises a TRIAC.
Claim 13
Dependent Claim
305 words
A condition responsive control circuit for governing the alternating current power supplied to a load from an alternating current power supply by controlling the power supply phase angles at which the load is energized comprising: a. an electronic control switch comprising power electrode means connected between the load and the alternating current power supply, said control switch further comprising gate electrode means for initiating conduction of said control switch at substantially any given power supply phase angle during positive and negative power supply half cycles in response to positive going and negative going signals, respectively, supplied to said gate electrode means; b. condition responsive alternating current bridge circuit means connected across the power supply and comprising first and second branches each having an output terminal, at least one of said branches having an impedance which varies in relation to changes in a sensed condition so that the alternating current voltage across said bridge output terminals at any given power supply phase angle depends upon the sensed condition; c. phase shifting means associated with said bridge circuit means for shifting the phase of the voltage at one output terminal relative to the phase of the voltage at said other output terminal, said phase shifting means effective to reverse the polarity of the voltage across said bridge output terminals during any power supply half cycle between a relatively small power supply phase angle and a power supply phase angle of substantially 180* depending on the sensed condition; d. triggerable switch means defining an input circuit connected across said bridge output terminals and an output circuit connected to said gate means, said switch means rendered conductive during positive and negative power supply half cycles when the polarity of the voltage across said bridge output terminals has reversed and thereby rendering said control switch conductive to energize said load.
Claim 14
Dependent Claim
305 words
A condition responsive control circuit for governing the alternating current power supplied to a load from an alternating current power supply by controlling the power supply phase angles at which the load is energized comprising: a. an electronic control switch comprising power electrode means connected between the load and the alternating current power supply, said control switch further comprising gate electrode means for initiating conduction of said control switch at substantially any given power supply phase angle during positive and negative power supply half cycles in response to positive going and negative going signals, respectively, supplied to said gate electrode means; b. condition responsive alternating current bridge circuit means connected across the power supply and comprising first and second branches each having an output terminal, at least one of said branches having an impedance which varies in relation to changes in a sensed condition so that the alternating current voltage across said bridge output terminals at any given power supply phase angle depends upon the sensed condition; c. phase shifting means associated with said bridge circuit means for shifting the phase of the voltage at one output terminal relative to the phase of the voltage at said other output terminal, said phase shifting means effective to reverse the polarity of the voltage across said bridge output terminals during any power supply half cycle between a relatively small power supply phase angle and a power supply phase angle of substantially 180* depending on the sensed condition; d. triggerable switch means defining an input circuit connected across said bridge output terminals and an output circuit connected to said gate means, said switch means rendered conductive during positive and negative power supply half cycles when the polarity of the voltage across said bridge output terminals has reversed and thereby rendering said control switch conductive to energize said load.
Claim 15
Dependent Claim
42 words
A circuit as claimed in claim 6 wherein said triggerable switch means defines a PUT circuit and an SCR circuit conneCted in parallel and oppositely poled, the gates of said PUT and SCR connected together and defining part of said input circuit.
Claim 16
Dependent Claim
23 words
A circuit as claimed in claim 6 wherein said phase shifting means comprises a capacitor connected in series with one of said branches.
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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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |