US3648074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
On-off controller with solid-state differential circuit
Assignee: Robertshaw Controls Co
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Filing: 1970-05-04
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Granted: 1972-03-07
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Expires: 1990-05-04
Abstract
Abstract An on-off controller energized from an alternating current source with differential operation. The differential operation is obtained by using a solid-state circuit which introduces a resistance change in the circuitry in response to the on and off mode of the controller. The solid-state circuitry when conducting shunts the resistance used to provide the desired differential action. The shunt is removed when the solid-state circuitry is not conducting. Termination of the conducting state of the solidstate circuitry is delayed for two cycles of the alternating current. This eliminates the possibility of such termination being initiated by change in the on-off mode of the controller due to a spurious signal and prevents termination during the nonconducting portion of the alternating current cycle which is present when the controller is in the on mode.
Inventors
- 👤 Richard K Nurnberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:28
CPC Classifications
G; G05; G05B; G05B11/00; G05B11/01; G05B11/14; G05B11/16; G05D; G05D23/00; G05D23/19; G05D23/1906; G05D23/1909; G05D23/20; G05D23/24
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
174 words
A circuit providing differential operation of a controller having a semiconductor switching means with an on mode and off mode of operation determined by the resistance presented by a plurality of resistances connected in series, said resistances including a temperature-responsIve sensor, said circuit comprising semiconductor means having an on mode and off mode of operation, said semiconductor means connected to said semiconductor switching means in a manner causing said semiconductor means to be in the on mode of operation when said semiconductor switch means is in one of its modes of operation and causing said semiconductor means to be in the off mode of operation when said semiconductor switch means is in the other of its modes of operation, said semiconductor means connected to said series of resistances providing a shunt path for a portion of said plurality of resistances when said semiconductor means is in its on mode of operation, said semiconductor means including a diode connecting with said semiconductor switching means for detecting the mode of operation of said semiconductor switching means.
Claim 2
Dependent Claim
174 words
A circuit providing differential operation of a controller having a semiconductor switching means with an on mode and off mode of operation determined by the resistance presented by a plurality of resistances connected in series, said resistances including a temperature-responsIve sensor, said circuit comprising semiconductor means having an on mode and off mode of operation, said semiconductor means connected to said semiconductor switching means in a manner causing said semiconductor means to be in the on mode of operation when said semiconductor switch means is in one of its modes of operation and causing said semiconductor means to be in the off mode of operation when said semiconductor switch means is in the other of its modes of operation, said semiconductor means connected to said series of resistances providing a shunt path for a portion of said plurality of resistances when said semiconductor means is in its on mode of operation, said semiconductor means including a diode connecting with said semiconductor switching means for detecting the mode of operation of said semiconductor switching means.
Claim 3
Dependent Claim
173 words
A circuit providing differential operation of a controller having a semiconductor switching means with an on mode and off mode of operation determined by the resistance presented by a plurality of resistances connected in series, said resistances including a temperature-responsive sensor, said circuit comprising semiconductor means having an on mode and off mode of operation, said semiconductor means connected to said semiconductor switching means in a manner causing said semiconductor means to be in the on mode of operation when said semiconductor switch means is in one of its modes of operation and causing said semiconductor means to be in the off mode of operation when said semiconductor switch means is in the other of its modes of operation, said semiconductor means connected to said series of resistances providing a shunt path for a portion of said plurality of resistances when said semiconductor means is in its on mode of operation, said semiconductor means including means delaying a change of the semiconductor means from its on mode to its off mode of operation.
Claim 4
Dependent Claim
173 words
A circuit providing differential operation of a controller having a semiconductor switching means with an on mode and off mode of operation determined by the resistance presented by a plurality of resistances connected in series, said resistances including a temperature-responsive sensor, said circuit comprising semiconductor means having an on mode and off mode of operation, said semiconductor means connected to said semiconductor switching means in a manner causing said semiconductor means to be in the on mode of operation when said semiconductor switch means is in one of its modes of operation and causing said semiconductor means to be in the off mode of operation when said semiconductor switch means is in the other of its modes of operation, said semiconductor means connected to said series of resistances providing a shunt path for a portion of said plurality of resistances when said semiconductor means is in its on mode of operation, said semiconductor means including means delaying a change of the semiconductor means from its on mode to its off mode of operation.
Claim 5
Dependent Claim
231 words
A circuit providing differential operation of a controller having a semiconductor switching means with an on mode and off mode of operation determined by the resistance presented by a plurality of resistances connected in series, said resistances including a temperature-responsive sensor, said circuit comprising semiconductor means having an on mode and off mode of operation, said semiconductor means connected to said semiconductor switching means in a manner causing said semiconductor means to be in the on mode of operation when said semiconductor switch means is in one of its modes of operation and causing said semiconductor means to be in the off mode of operation when said semiconductor switch means is in the other of its modes of operation, said semiconductor means connected to said series of resistances providing a shunt path for a portion of said plurality of resistances when said semiconductor means is in its on mode of operation, said semiconductor means including a transistor having emitter, collector and base electrodes, said emitter and collector electrodes connected at opposite ends of said portion of said plurality resistances and means connecting said base electrode to said semiconductor switching means for biasing said transistor to contact and not conduct in accordance with the on and off modes of operation of said semiconductor switching means causing said transistor to shunt said portion of said plurality of resistances when said transistor is conducting.
Claim 6
Dependent Claim
231 words
A circuit providing differential operation of a controller having a semiconductor switching means with an on mode and off mode of operation determined by the resistance presented by a plurality of resistances connected in series, said resistances including a temperature-responsive sensor, said circuit comprising semiconductor means having an on mode and off mode of operation, said semiconductor means connected to said semiconductor switching means in a manner causing said semiconductor means to be in the on mode of operation when said semiconductor switch means is in one of its modes of operation and causing said semiconductor means to be in the off mode of operation when said semiconductor switch means is in the other of its modes of operation, said semiconductor means connected to said series of resistances providing a shunt path for a portion of said plurality of resistances when said semiconductor means is in its on mode of operation, said semiconductor means including a transistor having emitter, collector and base electrodes, said emitter and collector electrodes connected at opposite ends of said portion of said plurality resistances and means connecting said base electrode to said semiconductor switching means for biasing said transistor to contact and not conduct in accordance with the on and off modes of operation of said semiconductor switching means causing said transistor to shunt said portion of said plurality of resistances when said transistor is conducting.
Claim 7
Dependent Claim
31 words
The circuit in accordance with claim 3 wherein said semiconductor means includes means connected to said transistor delaying the change of said transistor from a conducting mode to a nonconducting mode.
Claim 8
Dependent Claim
27 words
The circuit in accordance with claim 4 wherein said means delaying the change of said transistor from a conducting mode to a nonconducting mode includes a capacitor.
Claim 9
Dependent Claim
267 words
A circuit providing differential operation of a controller having a semiconductor switching means with an on mode and off mode of operation determined by the resistance presented by a plurality of resistances connected in series, said resistances including a temperature-responsive sensor, said circuit comprising semiconductor means having an on mode and off mode of operation, said semiconductor means connected to said semiconductor switching means in a manner causing said semiconductor means to be in the on mode of operation when said semiconductor switch means is in one of its modes of operation and causing said semiconductor means to be in the off mode of operation when said semiconductor switch means is in the other of its modes of operation, said semiconductor means connected to said series of resistances providing a shunt path for a portion of said plurality of resistances when said semiconductor means is in its on mode of operation, said semiconductor means including a first transistor and a second transistor, said first transistor connected to said semiconductor switching means, said first transistor being in an on mode of operation when said semiconducting switch means is in its on mode of operation and being in an off mode of operation when said semiconductor switching means is in its off mode of operation, means connecting said first and second transistor, said second transistor conducting when said first transistor is in an on mode of operation, said second transistor having its emitter and collector electrodes connected across a portion of said plurality of resistances to provide a shunt path for said portion when said second transistor is conducting.
Claim 10
Dependent Claim
267 words
A circuit providing differential operation of a controller having a semiconductor switching means with an on mode and off mode of operation determined by the resistance presented by a plurality of resistances connected in series, said resistances including a temperature-responsive sensor, said circuit comprising semiconductor means having an on mode and off mode of operation, said semiconductor means connected to said semiconductor switching means in a manner causing said semiconductor means to be in the on mode of operation when said semiconductor switch means is in one of its modes of operation and causing said semiconductor means to be in the off mode of operation when said semiconductor switch means is in the other of its modes of operation, said semiconductor means connected to said series of resistances providing a shunt path for a portion of said plurality of resistances when said semiconductor means is in its on mode of operation, said semiconductor means including a first transistor and a second transistor, said first transistor connected to said semiconductor switching means, said first transistor being in an on mode of operation when said semiconducting switch means is in its on mode of operation and being in an off mode of operation when said semiconductor switching means is in its off mode of operation, means connecting said first and second transistor, said second transistor conducting when said first transistor is in an on mode of operation, said second transistor having its emitter and collector electrodes connected across a portion of said plurality of resistances to provide a shunt path for said portion when said second transistor is conducting.
Claim 11
Dependent Claim
33 words
The circuit in accordance with claim 6 wherein said semiconductor means includes means connected to said first transistor delaying the change of said first transistor from its on mode to its off mode.
Claim 12
Dependent Claim
14 words
The circuit in accordance with claim 7 wherein said last-mentioned means includes a capacitor.
Claim 13
Dependent Claim
37 words
The circuit in accordance with claim 1 wherein said semiconductor switching means includes a silicon-controlled rectifier and said diode is connected to the anode of said silicon controlled rectifier to conduct when said silicon-controlled rectifier is conducting.
References Cited (Backward Citations)
US3334244A
Cited
US3379939A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |