US3769520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Demand limit control system
Assignee: Individual
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Filing: 1972-11-13
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Granted: 1973-10-30
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Expires: 1992-11-13
Abstract
Abstract This system provides for automatically energizing and deenergizing electrical loads according to priority designations thereof so that the overall power requirement for a given system of electrical loads does not exceed a limiting value. The system provides a means to automatically set a voltage divider network for a range of load demands that the system will monitor and control. Further, the system provides for sequentially turning on electrical loads and turning off electrical loads so that certain electrical loads will have a priority over certain other loads. In addition, the system permits the electrical loads to be energized such that expendable electrical loads will temporarily be removed from an energy demanding status until priority electrical loads have been satisfied.
Inventors
- 👤 D Carrington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:27
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/17; H02J2105/00; H02J2105/50; H02J2105/52; Y; Y02; Y02B; Y02B70/00; Y02B70/30; Y02B70/3225; Y04; Y04S; Y04S20/00; Y04S20/20; Y04S20/222
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
309 words
A system for sequentially energizing and alternatively deenergizing a plurality of electrical loads in a network so that the overall power demand for said network does not exceed a predetermined level comprising in combination: an electrical current sampling means connected to the electrical current supply for said netowrk and capable of producing a d.c. signal representative of the electrical current being supplied to said network; first, second and third resistor network means connected to said sampling means to respectively produce first, second and third control signals; transfer means for automatically connecting and disconnecting resistors in each of said first, second and third resistor networks to respectively alter said first, second and third control signals; a plurality of electrical load means connected to said supply and arranged to be sequentially energized in response to sequential energizing signals and further arranged to be sequentially de-energized in response to sequential deenergizing signals; first signal switching means connected to said first resistor network and to said plurality of electrical load means to direct sequential energizing signals to said plurality of electrical load means in response to said first control signal having a value less than a first predetermined value; second signal switching means connected to said second resistor network and to said plurality of load means to direct sequential de-energizing signals to said plurality of load means in response to said second control signal having a value greater than a second predetermined value, third signal switching means connected to said third resistor network and to said transfer means to direct signals thereto for the purpose of activating said transfer means in response to said third control signal having a value greater than a particular value whereby said first, second and third resistor network means have certain resistors connected therein and certain resistors disconnected therefrom thereby altering said first, second and third control signals.
Claim 2
Independent Claim
309 words
A system for sequentially energizing and alternatively deenergizing a plurality of electrical loads in a network so that the overall power demand for said network does not exceed a predetermined level comprising in combination: an electrical current sampling means connected to the electrical current supply for said netowrk and capable of producing a d.c. signal representative of the electrical current being supplied to said network; first, second and third resistor network means connected to said sampling means to respectively produce first, second and third control signals; transfer means for automatically connecting and disconnecting resistors in each of said first, second and third resistor networks to respectively alter said first, second and third control signals; a plurality of electrical load means connected to said supply and arranged to be sequentially energized in response to sequential energizing signals and further arranged to be sequentially de-energized in response to sequential deenergizing signals; first signal switching means connected to said first resistor network and to said plurality of electrical load means to direct sequential energizing signals to said plurality of electrical load means in response to said first control signal having a value less than a first predetermined value; second signal switching means connected to said second resistor network and to said plurality of load means to direct sequential de-energizing signals to said plurality of load means in response to said second control signal having a value greater than a second predetermined value, third signal switching means connected to said third resistor network and to said transfer means to direct signals thereto for the purpose of activating said transfer means in response to said third control signal having a value greater than a particular value whereby said first, second and third resistor network means have certain resistors connected therein and certain resistors disconnected therefrom thereby altering said first, second and third control signals.
Claim 3
Dependent Claim
95 words
A system for sequentially energizing and alternatively deenergizing a plurality of electrical loads in a network according to claim 1 wherein said electrical current sampling means includes a summing network, a plurality of full wave rectifiers and a plurality of transformer means, the secondaries of each being connected to a different one of said full wave rectifiers and wherein the outputs of each of said full wave rectifiers is connected to said summing network to provide a d.c. signal representative of the sum of the signals provided by said plurality of the full wave rectifiers.
Claim 4
Dependent Claim
67 words
A system for sequentially energizing and alternatively deenergizing a plurality of electrical loads in the network according to claim 1 wherein said first and second resistor network comprise resistors of a double-pole, multi-position solenoid actuated rotary switch and wherein said third resistor network comprises a set of resistors of a double-pole, multi-position solenoid actuated rotary switch and further wherein said transfer means include first and second solenoids.
Claim 5
Dependent Claim
121 words
A system for sequentially energizing and alternatively deenergizing a plurality of electrical loads in a network according to claim 1 wherein said first signal switching means includes a first silicon controlled rectifier whose gate is connected to receive said first control signal and whose anode is connected to a first relay means to energize said first relay means when said silicon controlled rectifier conducts and wherein said relay means has a normally closed transfer strap and wherein there is further included a source of pulses connected to said normally closed transfer strap whereby so long as said first silicon controlled rectifier is de-energized said pulses will pass through said normally closed strap, acting as energizing pulses, to said plurality of loads.
Claim 6
Dependent Claim
121 words
A system for sequentially energizing and alternatively deenergizing a plurality of electrical loads in the network according to claim 1 wherein the said second signal switching means includes a second silicon controlled rectifier whose gate element is connected to receive said second control signal and whose anode is connected to a second relay means and wherein said second relay means has a normally open transfer strap and wherein there is further included a source of pulses connected to said normally open transfer strap whereby when said second silicon controlled rectifier conducts said second relay means is energized to close said normally open transfer strap to provide pulse signals therethrough to said plurality of loads with said pulses acting as de-energizing signals.
Claim 7
Dependent Claim
151 words
A system for sequentially energizing and alternatively deenergizing a plurality of electrical loads in a network according to claim 1 wherein said third signal switching means includes a third silicon controlled rectifier connected to receive said third control signal and whose anode is connected to a thermal delay relay and wherein said thermal delay relay has a normally open transfer strap whereby when said third silicon controlled rectifier is energized said thermal delay relay is energized thereby closing said normally open strap and wherein there is a fourth relay means connected to said last mentioned normally open relay strap to be energized thereby and wherein said fourth relay means has transfer straps connected to said transfer means whereby when said fourth relay is energized said normally open transfer straps are transferred to energize said transfer means and thereby connect and disconnect certain resistors in said first, second and third resistor networks.
Claim 8
Dependent Claim
60 words
A system for sequentially energizing and alternatively deenergizing a plurality of electrical loads in a network according to claim 6 where there is further included a Zener diode means connected to said third silicon controlled rectifier and to receive said third control signal and wherein said Zener diode means has a threshold value which is higher than said particular value.
Claim 9
Dependent Claim
137 words
A system for sequentially energizing and alternatively deenergizing a plurality of electrical loads in a network according to claim 6 wherein there is further included a second Zener diode having a threshold value which is equal to said particular value and wherein said last mentioned Zener diode has its anode connected to a fourth silicon controlled rectifier to cause said fourth silicon controlled rectifier to conduct when a signal passes through said last mentioned Zener diode and wherein said fourth silicon controlled rectifier has its anode connected to a fourth relay means and wherein the transfer straps of said fourth relay means is connected to energize a time delay circuit the output of which is connected to said third silicon controlled rectifier to cause said third silicon controlled rectifier to conduct after a given period of time.
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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |