US3694663A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Condition responsive circuit with limited internal dissipation
Assignee: Honeywell Inc
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Filing: 1971-08-05
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Granted: 1972-09-26
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Expires: 1991-08-05
Abstract
Abstract A condition responsive circuit, disclosed as including a temperature responsive element, is adapted to be connected by a pair of terminals to an alternating current load and to a source of alternating current voltage. The condition responsive circuit contains two different input impedances connected through a transistor to a differential amplifier to control a solid state switch, shown as a Triac. One of the input impedances is connected by a four-layer diode across the input of the condition responsive circuit and shorts the circuit out if the differential amplifier has not been energized to in turn operate the solid state power switching means, or Triac, prior to the voltage across the four-layer diode reaching its breakover potential. This arrangement allows for switching to a relatively high impedance within the condition responsive circuit to limit the dissipation except during the initial energizing portion of the applied waveform.
Inventors
- 👤 Balthasar Hubert Pinckaers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:47
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/24; G05D23/1906; G05D23/1909
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
193 words
A condition responsive circuit adapted to energize load means from a voltage source having a periodically varying and reversing voltage level, including: a pair of terminals for said circuit adapted to be connected to said voltage source having said periodically varying voltage level and said load means to operatively energize said condition responsive circuit; first circuit means including impedance means and voltage breakdown means connected between said terminals; second circuit means including second impedance means, solid state switch means, and condition responsive means in parallel circuit with said first impedance means and said voltage breakdown means; and switching circuit means having input means connected to said second circuit means and further having output circuit means including solid state power switching means connected across said terminals to substantially short circuit said terminals upon operation of said power switching means; said switching circuit means operating said power switching means to energize said load means under the control of said condition responsive means providing the applied voltage level has not reached a sufficient voltage to cause said voltage breakdown means to conduct thereby substantially shortcircuiting said switching circuit input means to disable said switching circuit means.
Claim 2
Dependent Claim
193 words
A condition responsive circuit adapted to energize load means from a voltage source having a periodically varying and reversing voltage level, including: a pair of terminals for said circuit adapted to be connected to said voltage source having said periodically varying voltage level and said load means to operatively energize said condition responsive circuit; first circuit means including impedance means and voltage breakdown means connected between said terminals; second circuit means including second impedance means, solid state switch means, and condition responsive means in parallel circuit with said first impedance means and said voltage breakdown means; and switching circuit means having input means connected to said second circuit means and further having output circuit means including solid state power switching means connected across said terminals to substantially short circuit said terminals upon operation of said power switching means; said switching circuit means operating said power switching means to energize said load means under the control of said condition responsive means providing the applied voltage level has not reached a sufficient voltage to cause said voltage breakdown means to conduct thereby substantially shortcircuiting said switching circuit input means to disable said switching circuit means.
Claim 3
Dependent Claim
35 words
A condition responsive circuit as described in claim 1 wherein said first circuit means includes rectifier means so that said periodically varying voltage level is always of the same polarity from a zero reference level.
Claim 4
Dependent Claim
29 words
A condition responsive circuit as described in claim 2 wherein said rectifier means includes full wave bridge means, and said power switching means is bidirectional in current conducting capabilities.
Claim 5
Dependent Claim
24 words
A condition responsive circuit as described in claim 3 wherein said impedance means are resistors and said solid state switch means is a transistor.
Claim 6
Dependent Claim
52 words
A condition responsive circuit as described in claim 3 wherein said switching circuit means is a differential amplifier and current comparing circuit to provide a current output to said bidirectional power switch means when said amplifier has an output prior to said voltage breakdown means conducting to disable said switching circuit means.
Claim 7
Dependent Claim
18 words
A condition responsive circuit as described in claim 5 wherein said voltage breakdown means is a four-layer diode.
Claim 8
Dependent Claim
43 words
A condition responsive circuit as described in claim 1 wherein said switching circuit means output circuit means is a transistor that operates as a transistor for current flow in a forward direction and as a diode for current flow in a reverse direction.
Claim 9
Dependent Claim
35 words
A condition responsive circuit as described in claim 7 wherein said first circuit means includes rectifier means so that said periodically varying voltage level is always in the same polarity from a zero reference level.
Claim 10
Dependent Claim
29 words
A condition responsive circuit as described in claim 8 wherein said rectifier means includes full wave bridge means and said power switching means is bidirectional in current conducting capabilities.
Claim 11
Dependent Claim
52 words
A condition responsive circuit as described in claim 9 wherein said switching circuit means is a differential amplifier and current comparing circuit to provide a current output to said bidirectional power switching means when said amplifier has an output prior to said voltage breakdown means conducting to disable said switching circuit means.
References Cited (Backward Citations)
US3523182A
Cited
US3566151A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |