US3852648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control circuit
Assignee: Carrier Corp
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Filing: 1973-02-15
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Granted: 1974-12-03
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Expires: 1993-02-15
Abstract
Abstract An air conditioning system is provided to supply treated air to an area. The system includes a refrigeration unit comprising a motor-driven compressor, a condenser, an evaporator, and expansion means. The motor includes a run winding and a start or auxiliary winding connected in parallel. A run capacitor is connected in series with the auxiliary winding of the motor. A positive temperature coefficient thermistor is connected in parallel with the run capacitor. The flow of current to the auxiliary winding passes through both the positive temperature coefficient thermistor and capacitor upon starting and passes through substantially only the capacitor during normal running conditions.
Inventors
- 👤 V Barry
- 👤 G Privon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:53
CPC Classifications
H; H02; H02P; H02P1/00; H02P1/16; H02P1/42; H02P1/44; H02P1/445
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
337 words
In an air conditioning system operable to supply treated air to an area including a refrigeration unit comprising a compressor, a condenser, an evaporator and expansion means connected in a closed circuit, a motor for actuating said compressor, said motor having a main winding and an auxiliary winding connected in parallel, the improvement which comprises a control circuit to regulate the operation of the compressor motor of said refrigeration unit comprising: A. a supply circuit for providing electrical energy to said compressor motor, including thermally responsive switch means operable to energize said supply circuit in response to temperature conditions in said area; B. a temperature responsive resistance element connected in series with said auxiliary winding of said compressor motor, the resistance of said responsive element substantially increasing as a function of its temperature, the temperature thereof being increased by the flow of current therethrough; C. first capacitor means connected in series with said auxiliary winding and in parallel with said temperature responsive element, current to said auxiliary winding during starting conditions flowing through both said first capacitor means and said temperature responsive element in a predetermined relationship; current to said auxiliary winding passing only through said capacitor means when the resistance of said element substantially eliminates the flow of current therethrough when normal operating conditions have been obtained; and D. heat sensitive means responsive to the temperature of said resistance element, said heat sensitive means being placed in a state so as to substantially interrupt the flow of electrical energy therethrough in response to the increase of the temperature level of said resistance element, caused by the flow of current therethrough, said heat sensitive means when in its energy interrupting state operating to prevent reenergization of said compressor motor once the supply of electrical energy thereto has been interrupted, reenergization being prevented until said heat sensitive means is placed in a state to permit the passage of energy therethrough in response to the temperature of said resistance element decreasing due to the interruption of current flow therethrough.
Claim 2
Dependent Claim
337 words
In an air conditioning system operable to supply treated air to an area including a refrigeration unit comprising a compressor, a condenser, an evaporator and expansion means connected in a closed circuit, a motor for actuating said compressor, said motor having a main winding and an auxiliary winding connected in parallel, the improvement which comprises a control circuit to regulate the operation of the compressor motor of said refrigeration unit comprising: A. a supply circuit for providing electrical energy to said compressor motor, including thermally responsive switch means operable to energize said supply circuit in response to temperature conditions in said area; B. a temperature responsive resistance element connected in series with said auxiliary winding of said compressor motor, the resistance of said responsive element substantially increasing as a function of its temperature, the temperature thereof being increased by the flow of current therethrough; C. first capacitor means connected in series with said auxiliary winding and in parallel with said temperature responsive element, current to said auxiliary winding during starting conditions flowing through both said first capacitor means and said temperature responsive element in a predetermined relationship; current to said auxiliary winding passing only through said capacitor means when the resistance of said element substantially eliminates the flow of current therethrough when normal operating conditions have been obtained; and D. heat sensitive means responsive to the temperature of said resistance element, said heat sensitive means being placed in a state so as to substantially interrupt the flow of electrical energy therethrough in response to the increase of the temperature level of said resistance element, caused by the flow of current therethrough, said heat sensitive means when in its energy interrupting state operating to prevent reenergization of said compressor motor once the supply of electrical energy thereto has been interrupted, reenergization being prevented until said heat sensitive means is placed in a state to permit the passage of energy therethrough in response to the temperature of said resistance element decreasing due to the interruption of current flow therethrough.
Claim 3
Dependent Claim
63 words
The combination in accordance with claim 1 further including: A. means for supplying a heat exchange medium in heat transfer relation with said condenser; and B. means for supplying electrical energy to said heat exchange medium supply means, said last mentioned means being operable even if the energization of said compressor motor is prevented by the operation of said heat sensitive switch means.
Claim 4
Dependent Claim
140 words
The combination in accordance with claim 1 further including: A. second capacitor means in parallel with said first capacitor means and said temperature responsive resistance element; and B. switch means connected in series with said second capacitor means and said auxiliary winding; the flow of current through said resistance element during starting conditions acting to place said switch means in a conducting state to provide a flow of current through said second capacitor means to said auxiliary winding; the increased resistance due to the increased temperature of said element during normal operation of said compressor motor limiting the flow of current to said switch means to place said switch means in a non-conducting state to prevent flow of current through said second capacitor means, the flow of current to said auxiliary winding then pasSing only through said first capacitor means.
Claim 5
Dependent Claim
139 words
The combination in accordance with claim 1 further including: A. resistor means connected in parallel with said first capacitor means and said temperature responsive resistance element; and B. switch means connected in series with said resistor means and said auxiliary winding; the flow of current through said temperature responsive resistance element during starting conditions acting to place said switch means in a conducting state to provide a flow of current through said resistor means to said auxiliary winding; the increased resistance of said temperature responsive resistance element due to the increased temperature thereof during normal operation of said compressor motor operating to place said switch means in a non-conducting state to prevent flow of current through said resistor means to said auxiliary winding, the flow of current through said auxiliary winding then passing only through said first capacitor means.
Claim 6
Dependent Claim
245 words
A control circuit for a motor having a main winding and an auxiliary winding connected in parallel comprising: A. a supply circuit for providing electrical energy to said motor, including switch means operable to energize said supply circuit, said switch means including a first switch in series with both the main and auxiliary windings; B. a temperature responsive resistance element connected in series with said auxiliary winding of said motor, the resistance of said element substantially increasing as a function of its temperature, the temperature thereof being increased by the flow of current therethrough; and C. heat sensitive means responsive to the temperature of the resistance element, said heat sensitive means being placed in a state so as to substantially interrupt the flow of electrical energy therethrough in response to the increase of the temperature level of said resistance element, caused by the flow of current therethrough, said heat sensitive means when in its energy interrupting state operating to prevent reenergization of said motor once the supply of electrical energy thereto has been interrupted, reenergization being prevented until said heat sensitive means is placed in a state to permit the passage of energy therethrough in response to the temperature of said resistance element decreasing due to the interruption of current flow therethrough, said heat sensitive means when in its energy interrupting state functioning to maintain said first switch in a position to prevent flow of the electrical energy to both said main and auxiliary windings.
Claim 7
Dependent Claim
245 words
A control circuit for a motor having a main winding and an auxiliary winding connected in parallel comprising: A. a supply circuit for providing electrical energy to said motor, including switch means operable to energize said supply circuit, said switch means including a first switch in series with both the main and auxiliary windings; B. a temperature responsive resistance element connected in series with said auxiliary winding of said motor, the resistance of said element substantially increasing as a function of its temperature, the temperature thereof being increased by the flow of current therethrough; and C. heat sensitive means responsive to the temperature of the resistance element, said heat sensitive means being placed in a state so as to substantially interrupt the flow of electrical energy therethrough in response to the increase of the temperature level of said resistance element, caused by the flow of current therethrough, said heat sensitive means when in its energy interrupting state operating to prevent reenergization of said motor once the supply of electrical energy thereto has been interrupted, reenergization being prevented until said heat sensitive means is placed in a state to permit the passage of energy therethrough in response to the temperature of said resistance element decreasing due to the interruption of current flow therethrough, said heat sensitive means when in its energy interrupting state functioning to maintain said first switch in a position to prevent flow of the electrical energy to both said main and auxiliary windings.
Claim 8
Dependent Claim
83 words
A control circuit in accordance with claim 5 further including: first capacitor means connected in series with said auxiliary winding and in parallel with said temperature responsive element, current to said auxiliary winding during starting conditions flowing through both said first capacitor means and said temperature responsive element in a predetermined relationship; current to said auxiliary winding passing only through said capacitor means when the resistance of said element substantially eliminates the flow of current therethrough when normal operating conditions have been obtained.
Claim 9
Dependent Claim
140 words
A control circuit in accordance with claim 6 further including: A. second capacitor means in parallel with said first capacitor means and said temperature responsive resistance element; and B. switch means connected in series with said second capacitor means and said auxiliary winding, the flow of current through said resistance element during starting conditions acting to place said switch means in a conducting state to provide a flow of current through said second capacitor means to said auxiliary winding; the increased resistance due to the increased temperature of said element during normal operation of said motor limiting the flow of current to said switch means to place said switch means in a non-conducting state to prevent flow of current through said second capacitor meaNs, the flow of current to said auxiliary winding then passing only through said first capacitor means.
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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |