US3735148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for heating or air conditioning
Assignee: TDK Micronas GmbH
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Filing: 1972-01-10
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Granted: 1973-05-22
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Expires: 1992-01-10
Abstract
Abstract A system for heating or air conditioning wherein provision is made for controlling fan speed and/or the heating and modulating valve in accordance with thermostat demand. The thermostat puts out a step function followed by a ramp for both on-off and proportional control. One valve may be used in series with another for each function. A logic gate is provided to override the speed control when the plenum is cold. Half speed is provided for a hot plenum even though there is no thermostat demand for heat. Two detectors are provided for plenum temperature. The same thermostat is used with both voltage sensitive and current sensitive circuits.
Inventors
- 👤 S Sapir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:30
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/1927; G05D23/193; G05D23/1931
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
In a current control circuit, the combination comprising: a gate including a current control electrode; first means for generating a timing pulse when the current through said gate passes through zero; and second means responsive to said timing pulse for applying a gating signal to said control electrode at some time after said timing pulse is generated; a transformer being provided having a primary winding and a secondary winding, said gate being a triac having said electrode connected to said primary winding, a full wave bridge rectifier having one pair of corners connected across said secondary, a silicon controlled rectifier connected across the other pair of corners and poled in the same direction as the rectifiers in said bridge, said silicon controlled rectifier having a gate, said second means including means to supply a signal to said rectifier gate and thereby to short circuit said secondary.
Claim 2
Dependent Claim
146 words
In a current control circuit, the combination comprising: a gate including a current control electrode; first means for generating a timing pulse when the current through said gate passes through zero; and second means responsive to said timing pulse for applying a gating signal to said control electrode at some time after said timing pulse is generated; a transformer being provided having a primary winding and a secondary winding, said gate being a triac having said electrode connected to said primary winding, a full wave bridge rectifier having one pair of corners connected across said secondary, a silicon controlled rectifier connected across the other pair of corners and poled in the same direction as the rectifiers in said bridge, said silicon controlled rectifier having a gate, said second means including means to supply a signal to said rectifier gate and thereby to short circuit said secondary.
References Cited (Backward Citations)
US3335360A
Cited
US3381226A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |