Patent US4138607A successfully refreshed from Google Patents.
US4138607A
Expired / Lapsed
US
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Dual priority temperature control
Assignee: Pako Corp
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Filing: 1977-06-24
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Granted: 1979-02-06
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Expires: 1997-06-24
Abstract
Abstract A temperature control system controls operation of two heaters, such as the solution heater and dryer heater of a photographic processor. First and second temperature detectors sense temperature and provide first and second detector signals, which are compared with first and second reference ramp signals by first and second comparators. The comparators produce first and second inhibit signals, which prevent power from being supplied to the first and second heaters, respectively. A priority circuit prevents power from being supplied to the second heater if the first heater is receiving power.
Inventors
- 👤 Rudolph H. Engelmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:27
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/12; H02J3/14; G; G05; G05D; G05D23/00; G05D23/19; G05D23/1927; G05D23/193; G05D23/1932; G05D23/20; G05D23/24; H02J2105/00; H02J2105/50; H02J2105/54; Y; Y02; Y02B; Y02B70/00; Y02B70/30; Y02B70/3225; Y04; Y04S; Y04S20/00; Y04S20/20; Y04S20/222; Y04S20/242; Y04S20/244
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
302 words
A control system for controlling the operation of first and second loads, the control system comprising: first switching means for preventing power from being applied to the first load when in a first state, and permitting power to be applied to the first load when in a second state, the first switching means switching from the first to the second state in response to a first triggering pulse signal; second switching means for preventing power from being applied to the second load when in a first state, and permitting power to be applied to the first load when in a second state, the second switching means switching from the first to the second state in response to a second triggering pulse signal; triggering pulse producing means for producing the first and second triggering pulse signals; first detector means for providing a first detector signal indicative of a parameter associated with the first load; second detector means for providing a second detector signal indicative of a parameter associated with the second load; first reference signal producing means for producing a first reference signal; second reference signal producing means for producing a second reference signal; first inhibit means for providing a first inhibit signal to the triggering pulse producing means to prevent the triggering pulse producing means from producing the first triggering pulse signals when the first detector signal and the first reference signal have a first predetermined relationship; second inhibit means for providing a second inhibit signal to the triggering pulse producing means to prevent the triggering pulse producing means from producing the second triggering pulse signal until the second detector signal and the second reference signal attain a second predetermined relationship; and priority means for preventing production of the second triggering pulse signal when the first triggering pulse signal is being produced.
Claim 2
Dependent Claim
302 words
A control system for controlling the operation of first and second loads, the control system comprising: first switching means for preventing power from being applied to the first load when in a first state, and permitting power to be applied to the first load when in a second state, the first switching means switching from the first to the second state in response to a first triggering pulse signal; second switching means for preventing power from being applied to the second load when in a first state, and permitting power to be applied to the first load when in a second state, the second switching means switching from the first to the second state in response to a second triggering pulse signal; triggering pulse producing means for producing the first and second triggering pulse signals; first detector means for providing a first detector signal indicative of a parameter associated with the first load; second detector means for providing a second detector signal indicative of a parameter associated with the second load; first reference signal producing means for producing a first reference signal; second reference signal producing means for producing a second reference signal; first inhibit means for providing a first inhibit signal to the triggering pulse producing means to prevent the triggering pulse producing means from producing the first triggering pulse signals when the first detector signal and the first reference signal have a first predetermined relationship; second inhibit means for providing a second inhibit signal to the triggering pulse producing means to prevent the triggering pulse producing means from producing the second triggering pulse signal until the second detector signal and the second reference signal attain a second predetermined relationship; and priority means for preventing production of the second triggering pulse signal when the first triggering pulse signal is being produced.
Claim 3
Dependent Claim
36 words
The control system of claim 1 wherein the priority means comprises: means for causing the second inhibit means to produce the second inhibit signal when the first inhibit means is not producing the first inhibit signal.
Claim 4
Dependent Claim
17 words
The control system of claim 1 wherein the first and second reference signals are time varying signals.
Claim 5
Dependent Claim
19 words
The control system of claim 3 wherein the first and second reference signals comprise first and second ramp signals.
Claim 6
Dependent Claim
16 words
The control system of claim 4 wherein the first and second ramp signals have different slopes.
Claim 7
Dependent Claim
22 words
The control system of claim 5 wherein first ramp signal is a down ramp and second ramp signal is an up ramp.
Claim 8
Dependent Claim
18 words
The control system of claim 6 wherein the first and second inhibit means comprises first and second comparators.
Claim 9
Dependent Claim
40 words
The control system of claim 7 wherein the first predetermined relationship is attained when the first detector signal exceeds the first ramp and the second predetermined relationship is attained when the second detector signal is less than the second ramp.
Claim 10
Dependent Claim
111 words
The control system of claim 1 wherein the triggering pulse producing means comprises: zero crossover sensing means for receiving an AC signal and producing zero crossover pulses in response to zero crossover of the AC signal; first triggering pulse producing means for receiving the zero crossover pulses and the first inhibit signal and producing the first triggering pulses in response to the zero crossover pulses when not inhibited by the first inhibit signal; and second triggering pulse producing means for receiving the zero crossover pulses and the second inhibit signal and producing the second triggering pulses in response to the zero crossover pulses when not inhibited by the second inhibit signal.
Claim 11
Dependent Claim
20 words
The control system of claim 9 wherein the first and second reference signals are first and second ramp signals, respectively.
Claim 12
Dependent Claim
54 words
The control system of claim 10 wherein the first and second reference signal producing means comprise: counter means for counting in response to the zero crossover pulses occurring in a single designated quadrant; first and second ramp producing means for producing the first and second ramp signals from the output of the counter means.
Claim 13
Dependent Claim
155 words
A temperature control system for controlling operation of first and second heaters, the system comprising: first and second control means for controlling input power supplied to the first and second heaters, respectively; first and second temperature detector means for providing first and second detector signals, respectively; first and second reference signal producing means for producing first and second reference signals, respectively; first inhibit means for receiving the first detector signal and first reference signal and supplying a first inhibit signal to the first control means to prevent input power from being supplied to the first heater; second inhibit means for receiving the second detector signal and second reference signal and supplying a second inhibit signal to the second control means to prevent input power from being supplied to the second heater; and priority means for preventing input power from being supplied to the second heater when input power is being supplied to the first heater.
Claim 14
Dependent Claim
155 words
A temperature control system for controlling operation of first and second heaters, the system comprising: first and second control means for controlling input power supplied to the first and second heaters, respectively; first and second temperature detector means for providing first and second detector signals, respectively; first and second reference signal producing means for producing first and second reference signals, respectively; first inhibit means for receiving the first detector signal and first reference signal and supplying a first inhibit signal to the first control means to prevent input power from being supplied to the first heater; second inhibit means for receiving the second detector signal and second reference signal and supplying a second inhibit signal to the second control means to prevent input power from being supplied to the second heater; and priority means for preventing input power from being supplied to the second heater when input power is being supplied to the first heater.
Claim 15
Dependent Claim
66 words
The temperature control system of claim 12 wherein the temperature control system has a plurality of operating cycles and wherein the first inhibit means supplies the first inhibit signal after the first detector signal and first reference signal attain a first predetermined relationship, the fraction of each operating cycle required for the first predetermined relationship to be attained being a function of the first detector signal.
Claim 16
Dependent Claim
58 words
The temperature control system of claim 13 wherein the second inhibit means supplies the second inhibit signal during each operating cycle until the second detector signal and second reference signal attain a second predetermined relationship, the fraction of each operating cycle required for the second predetermined relationship to be attained being a function of the second detector signal.
Claim 17
Dependent Claim
42 words
The temperature control system of claim 14 wherein the priority means prevents the second detector signal and second reference signal from attaining the second predetermined relationship before the first detector signal and the first reference signal have attained the first predetermined relationship.
Claim 18
Dependent Claim
41 words
The temperature control system of claim 15 wherein the priority means further comprises: means for causing the first detector signal and the first reference signal to attain the first predetermined relationship at least after a predetermined fraction of each operating cycle.
Claim 19
Dependent Claim
21 words
The temperature control system of claim 14 wherein the first and second reference signals are first and second ramp signals, respectively.
Claim 20
Dependent Claim
25 words
The temperature control system of claim 17 wherein the first ramp signal is an down ramp and the second ramp signal is an up ramp.
Claim 21
Dependent Claim
43 words
The temperature control system of claim 18 wherein the first predetermined relationship is attained when the first detector signal exceeds the first ramp signal and the second predetermined relationship is attained when the second detector signal is less than the second ramp signal.
Claim 22
Dependent Claim
135 words
The temperature control system of claim 12 wherein the first and second control means comprise: first switching means for preventing power from being applied to the first heater when in a first state, and permitting power to be applied to the first heater when in a second state, the first switching means switching from the first to the second state in response to a first triggering pulse signal; second switching means for preventing power from being applied to the second heater when in a first state, and permitting power to be applied to the second heater when in a second state, the second switching means switching from the first to the second state in response to a second triggering pulse signal; and triggering pulse producing means for producing the first and second triggering pulse signals.
Claim 23
Dependent Claim
30 words
The temperature control system of claim 20 wherein the first and second inhibit signals inhibit the triggering pulse producing means from producing the first and second triggering pulse signals, respectively.
Claim 24
Dependent Claim
105 words
The temperature control system of claim 21 wherein the triggering pulse producing means comprises; zero crossover sensing means for receiving an AC signal and producing zero crossover pulses in response to zero crossover of the AC signal; first triggering pulse producing means for receiving the zero crossover pulses and the frist inhibit signal and producing the first triggering pulses in response to the zero crossover pulses when not inhibited by the first inhibit signal; and second triggering pulse producing means for receiving the zero crossover pulses and the second inhibit signal and producing the second triggering pulses when not inhibited by the second inhibit signal.
Claim 25
Dependent Claim
22 words
The temperature control system of claim 20 wherein the first and second switching means comprise first and second triac switching circuits, respectively.
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) | 1982-02-05 | 1982-08-07 | 1983-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-05 | 1986-08-07 | 1987-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-05 | 1990-08-07 | 1991-02-06 | $7700.00 | Window Closed / Lapsed |