US3761018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic temperature control apparatus having a space thermostat with outdoor temperature compensation
Assignee: Honeywell Inc
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Filing: 1971-10-27
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Granted: 1973-09-25
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Expires: 1991-10-27
Abstract
Abstract Electronic temperature control apparatus having a temperature responsive resistance space thermostat connected to an amplifier circuit for providing an output to control a modulating multistage controller adapted to control stages of heating and cooling apparatus. An outdoor temperature responsive resistance compensating thermostat is connected to the amplifier circuit for modifying the control effect of the space thermostat. The outdoor thermostat is connected through a first diode to provide compensation when the system is used for heating and through a second diode reversely connected when the system is used for cooling to selectively isolate the output of the outdoor thermostat from modifying the space thermostat control of either the heating and the cooling apparatus. Errors due to diode voltage drops and diode voltage drifts with temperature are eliminated.
Inventors
- 👤 A Rekai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:38
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/24; G05D23/1927; G05D23/193; G05D23/1931
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
222 words
Control apparatus comprising: amplifier means having an input circuit and an output circuit, said output circuit being adapted to control conditioning apparatus for supplyiNg conditioned medium to a space, discriminating circuit means including two oppositely connected unidirectional voltage sensitive current conducting devices having an input circuit and two output circuits, and circuit connecting means connecting each of said output circuits of said discrimination circuit means to said input circuit of said amplifier means, said input circuit of said amplifier means being adapted to be connected to a space condition responsive apparatus whereby upon a need for a change in the condition of the space, the operation of the conditioning apparatus can be changed, said input circuit of said discriminating circuit means being adapted to be connected to an outdoor condition responsive apparatus for receiving a signal to be applied to said amplifier means to modify the effect of the space condition responsive apparatus on the conditioning apparatus by an amount depending upon which of said two output circuits are used, the space condition responsive means is a space thermostat responsive to space temperature and adapted to have a voltage output signal indicative of the space temperature and, the outdoor condition responsive means is an outdoor thermostat responsive the outdoor temperature and adapted to have a voltage output signal indicative of outdoor temperature.
Claim 2
Dependent Claim
222 words
Control apparatus comprising: amplifier means having an input circuit and an output circuit, said output circuit being adapted to control conditioning apparatus for supplyiNg conditioned medium to a space, discriminating circuit means including two oppositely connected unidirectional voltage sensitive current conducting devices having an input circuit and two output circuits, and circuit connecting means connecting each of said output circuits of said discrimination circuit means to said input circuit of said amplifier means, said input circuit of said amplifier means being adapted to be connected to a space condition responsive apparatus whereby upon a need for a change in the condition of the space, the operation of the conditioning apparatus can be changed, said input circuit of said discriminating circuit means being adapted to be connected to an outdoor condition responsive apparatus for receiving a signal to be applied to said amplifier means to modify the effect of the space condition responsive apparatus on the conditioning apparatus by an amount depending upon which of said two output circuits are used, the space condition responsive means is a space thermostat responsive to space temperature and adapted to have a voltage output signal indicative of the space temperature and, the outdoor condition responsive means is an outdoor thermostat responsive the outdoor temperature and adapted to have a voltage output signal indicative of outdoor temperature.
Claim 3
Dependent Claim
49 words
The invention of claim 1 wherein: said unidirectional voltage sensitive current conducting devices are diodes which are connected in reverse manner to allow said signal to pass to one of said output circuits when below a predetermined value and to another of said output circuits above a predetermined value.
Claim 4
Dependent Claim
126 words
The invention of claim 2 comprising; signal reversing means connected in said another output circuit for reversing the sense of said signal wherein, said one output circuit of said discriminating circuit means allows a signal indicative of an outdoor temperature in a range below a predetermined value to change the effects of the signal indicative of space temperature on said signal amplifier means to increase the temperature in the space as the outdoor temperature decreases, and said another output circuit of said discriminating circuit means allows a signal indicative of a high outdoor temperature in a range above a predetermined value to effect the signal indicative of space temperature on said signal amplifier means to increase the temperature in the space as the outdoor temperature increases.
Claim 5
Dependent Claim
184 words
Control apparatus comprising; circuit means having an input circuit and an output circuit, said output circuit being adapted to control conditioning apparatus circuit connection means adapted to connect space condition responsive means to said input circuit for controlling said conditioning apparatus, and discriminating circuit means comprising an unidirectional voltage sensitive current conducting device adapted to connect an outdoor condition responsive means to said input circuit whereby said outdoor condition responsive means can modify the effect of said space condition responsive means on said conditioning apparatus, said current conducting device is a diode whereby upon a signal voltage from the space responsive means being greater than a signal voltage from the outdoor condition responsive means current conducts through a circuit associated with said diode to modify the effect of the space condition responsive means on the conditioning apparatus without diode errors being introduced, and said conditioning apparatus is temperature conditioning apparatus and the space and outdoor condition responsive means are temperature responsive means whereby the control of the temperature conditioning apparatus by the space temperature responsive means is modified by the outdoor temperature responsive means.
Claim 6
Dependent Claim
184 words
Control apparatus comprising; circuit means having an input circuit and an output circuit, said output circuit being adapted to control conditioning apparatus circuit connection means adapted to connect space condition responsive means to said input circuit for controlling said conditioning apparatus, and discriminating circuit means comprising an unidirectional voltage sensitive current conducting device adapted to connect an outdoor condition responsive means to said input circuit whereby said outdoor condition responsive means can modify the effect of said space condition responsive means on said conditioning apparatus, said current conducting device is a diode whereby upon a signal voltage from the space responsive means being greater than a signal voltage from the outdoor condition responsive means current conducts through a circuit associated with said diode to modify the effect of the space condition responsive means on the conditioning apparatus without diode errors being introduced, and said conditioning apparatus is temperature conditioning apparatus and the space and outdoor condition responsive means are temperature responsive means whereby the control of the temperature conditioning apparatus by the space temperature responsive means is modified by the outdoor temperature responsive means.
References Cited (Backward Citations)
US2801826A
Cited
US3292687A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |