US4072866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Proportional temperature control system incorporating a linear delay
Assignee: Honeywell Inc
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Filing: 1976-12-01
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Granted: 1978-02-07
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Expires: 1996-12-01
Abstract
Abstract A proportional temperature control system using a linear time delay circuit provides an output voltage that is similar to the output voltage of a thermostat but delayed in time. The delay circuit is a linear rate time delay system that compares a called for voltage shift at its input to the output voltage of an integrator circuit to provide a substantially linear rate of time delay. The comparator circuit and the integrator circuit are separated by a limiter so that regardless of the amount of the initial offset in voltage at the comparator, the rate of integration is always maintained the same.
Inventors
- 👤 John L. Kabat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:10
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/24; G05D23/1906; G05D23/1912
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
148 words
A linear rate time delay system, including: comparator means having input circuit means and output circuit means; voltage limiting means connected to said comparator output circuit means to receive an output voltage from said comparator means with said output voltage being limited in amplitude in both a positive and a negative sense with respect to a reference voltage; integrating amplifier means having an input connected to said voltage limiting means and further having output circuit means; said integrating amplifier means including capacitor means; and said integrating amplifier output circuit means connected to said comparator means input circuit means wherein said comparator means compares an input voltage with an integrating amplifier output voltage; said integrating amplifier output voltage being delayed with respect to time by said capacitor means whenever said input voltage of said comparator means changes an amount greater than a level set by said voltage limiting means.
Claim 2
Dependent Claim
148 words
A linear rate time delay system, including: comparator means having input circuit means and output circuit means; voltage limiting means connected to said comparator output circuit means to receive an output voltage from said comparator means with said output voltage being limited in amplitude in both a positive and a negative sense with respect to a reference voltage; integrating amplifier means having an input connected to said voltage limiting means and further having output circuit means; said integrating amplifier means including capacitor means; and said integrating amplifier output circuit means connected to said comparator means input circuit means wherein said comparator means compares an input voltage with an integrating amplifier output voltage; said integrating amplifier output voltage being delayed with respect to time by said capacitor means whenever said input voltage of said comparator means changes an amount greater than a level set by said voltage limiting means.
Claim 3
Dependent Claim
27 words
A linear time delay system as described in claim 1 wherein said integrating amplifier means includes an operational amplifier; and said capacitor means is an integrating capacitor.
Claim 4
Dependent Claim
22 words
A linear time delay system as described in claim 2 wherein said voltage limiting means is a pair of back-to-back connected diodes.
Claim 5
Dependent Claim
32 words
A linear time delay system as described in claim 3 wherein said comparator means is an operational amplifier having a non-inverting terminal coupled to the output voltage of said integrating amplifier means.
Claim 6
Dependent Claim
34 words
A linear time delay system as described in claim 4 wherein said operational amplifiers are energized from a common voltage source with said voltage source further including voltage breakdown means establishing said reference voltage.
Claim 7
Dependent Claim
19 words
A linear time delay system as described in claim 5 wherein said voltage breakdown means is a zener diode.
Claim 8
Dependent Claim
37 words
A linear time delay system as described in claim 6 wherein said integrating capacitor is connected in parallel circuit with a resistor and a diode to rapidly discharge said capacitor in the event of a power interruption.
Claim 9
Dependent Claim
182 words
A proportional temperature control system, including: thermostat means generating an output voltage proportional to an ambient temperature; comparator means having input circuit means and output circuit means with said input circuit means coupled to said thermostat means output voltage; voltage limiting means connected to said comparator output circuit means to receive an output voltage from said comparator means with said output voltage being limited in amplitude in both a positive and a negative sense with respect to a reference voltage; integrating amplifier means having an input connected to said voltage limiting means and further having output circuit means; said integrating amplifier means including capacitor means; and said integrating amplifier output circuit means connected to said comparator means input circuit means wherein said comparator means compares an input voltage with an integrating amplifier output voltage; said integrating amplifier output voltage being delayed with respect to time by said capacitor means whenever said input voltage of said comparator means changes an amount greater than a level set by said voltage limiting means to prevent said temperature control system from shifting at an undesirable rate.
Claim 10
Dependent Claim
182 words
A proportional temperature control system, including: thermostat means generating an output voltage proportional to an ambient temperature; comparator means having input circuit means and output circuit means with said input circuit means coupled to said thermostat means output voltage; voltage limiting means connected to said comparator output circuit means to receive an output voltage from said comparator means with said output voltage being limited in amplitude in both a positive and a negative sense with respect to a reference voltage; integrating amplifier means having an input connected to said voltage limiting means and further having output circuit means; said integrating amplifier means including capacitor means; and said integrating amplifier output circuit means connected to said comparator means input circuit means wherein said comparator means compares an input voltage with an integrating amplifier output voltage; said integrating amplifier output voltage being delayed with respect to time by said capacitor means whenever said input voltage of said comparator means changes an amount greater than a level set by said voltage limiting means to prevent said temperature control system from shifting at an undesirable rate.
Claim 11
Dependent Claim
38 words
A proportional temperature control system as described in claim 8 wherein said integrating amplifier means includes an operational amplifier; said capacitor means is an integrating capacitor; and said voltage limiting means is a pair of back-to-back connected diodes.
Claim 12
Dependent Claim
32 words
A proportional temperature control system as described in claim 9 wherein said comparator means is an operational amplifier having a non-inverting terminal coupled to an output voltage of said integrating amplifier means.
Claim 13
Dependent Claim
35 words
A proportional temperature control system as described in claim 10 wherein said operational amplifier are energized from a common voltage source with said voltage source further including a zener diode to establish said reference voltage.
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) | 1981-02-06 | 1981-08-08 | 1982-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-06 | 1985-08-08 | 1986-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-06 | 1989-08-08 | 1990-02-07 | $7700.00 | Window Closed / Lapsed |