US3784843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Condition responsive circuit with capacitive differential voltage
Assignee: Honeywell Inc
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Filing: 1972-07-21
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Granted: 1974-01-08
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Expires: 1992-07-21
Abstract
Abstract A condition responsive circuit, disclosed as including a temperature responsive element, is adapted to be connected to by a pair of terminals by an alternating current load and to a source of alternating current voltage. The condition responsive circuit operates through a differential amplifier to control a solid state switch, shown as a silicon controlled rectifier. This solid state switch in turn operates further solid state switching to control the load. A capacitor for creating a differential voltage in the input circuit of the differential amplifier is connected by a discharge circuit to the silicon controlled rectifier so that the voltage on the capacitor is discharged every time the silicon controlled rectifier is conductive.
Inventors
- 👤 C Gustus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:39
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/24; G05D23/1906; G05D23/1909
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
171 words
A condition control system having voltage storage means for creating a voltage differential within an input circuit of said system, including: condition responsive voltage divider network means including capacitor means and condition responsive means as a part of said voltage divider network means; unidirectional voltage source means connected to said condition responsive voltage divider means to apply a voltage to said condition responsive means and to charge said capacitor means to create a differential voltage in said voltage divider means; amplifier means having input means connected to said condition responsive voltage divider network means, and an output connected to solid state switch means; said solid state switch means being operated to conduct current in response to said condition responsive means; and discharge circuit means connecting said capacitor means to said solid state switch means so that said solid state switch means discharges said capacitor means when said switch means conducts thereby removing said differential voltage from said voltage divider means to provide a stable operating mode for said condition control system.
Claim 2
Dependent Claim
171 words
A condition control system having voltage storage means for creating a voltage differential within an input circuit of said system, including: condition responsive voltage divider network means including capacitor means and condition responsive means as a part of said voltage divider network means; unidirectional voltage source means connected to said condition responsive voltage divider means to apply a voltage to said condition responsive means and to charge said capacitor means to create a differential voltage in said voltage divider means; amplifier means having input means connected to said condition responsive voltage divider network means, and an output connected to solid state switch means; said solid state switch means being operated to conduct current in response to said condition responsive means; and discharge circuit means connecting said capacitor means to said solid state switch means so that said solid state switch means discharges said capacitor means when said switch means conducts thereby removing said differential voltage from said voltage divider means to provide a stable operating mode for said condition control system.
Claim 3
Dependent Claim
37 words
A condition control system as described in claim 1 wherein said condition responsive voltage divider network means is bridge means, and said amplifier means is differential amplifier means with said input means connected to said bridge means.
Claim 4
Dependent Claim
35 words
A condition control system as described in claim 2 wherein said unidirectional voltage source means includes rectifier means connected to a source of alternating current to provide a periodically varing voltage of a single polarity.
Claim 5
Dependent Claim
19 words
A condition control system as described in claim 3 wherein said condition responsive means is a temperature responsive resistor.
Claim 6
Dependent Claim
35 words
A condition control system as described in claim 4 wherein said solid state switch means includes a silicon controlled rectifier in a series circuit with a diode to prevent accidental discharge of said capacitor means.
Claim 7
Dependent Claim
27 words
A conditin control system as described in claim 5 wherein said capacitor means is a single capacitor, and said discharge circuit means includes a current limiting impedance.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |