US3866019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical control circuit
Assignee: Individual
•
Filing: 1973-09-10
•
Granted: 1975-02-11
•
Expires: 1993-09-10
Abstract
Abstract An electrical load monitoring and switching system comprises total load measuring means arranged to monitor an electrical supply, switch means connectible to control the supply of electrical power from said supply to partial load means forming a substantial part of a total load, but not forming the total load, and control means arranged to transfer the switch means between a closed condition in which said partial load means are energised as part of said total load from said supply, and an open condition in which said partial load means are no longer so energised, the control means being arranged to receive an input signal from said total load measuring means and to cause transfer of the switch means between the closed condition and the open condition when a first predetermined total load is exceeded, and further to effect a transfer of the switch means between the open condition and the closed position only when the total load falls to less than a second predetermined total load, the difference between the first predetermined total load and the second predetermined total load being larger than the maximum power which the said partial load means can extract from said supply.
Inventors
- 👤 Jean-Pierre Cartier
- 👤 David Winn
- 👤 Anthony L Stelmach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:43
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/12; H02J3/14; 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: 11
Claim 1
Independent Claim
200 words
An electrical load monitoring and switching system comprising: a. total load measuring means arranged to monitor an electrical supply; b. switch means connectible to control the supply of electrical power from said supply to partial load means forming a substantial part of a total load, but not forming the total load; and c. control means arranged to transfer the switch means between a closed condition in which said partial load means are energised as part of said total load from said supply, and an open condition in which said partial load means are no longer so energised; the control means being arranged to receive an input signal from said total load measuring means and to cause transfer of the switch means between the closed condition and the open condition when a first predetermined total load is exceeded; and further to effect a transfer of the switch means between the open condition and the closed position only when the total load falls to less than a second predetermined total load, the difference between the first predetermined total load and the second predetermined total load being larger than the maximum power which the said partial load means can extract from said supply.
Claim 2
Dependent Claim
200 words
An electrical load monitoring and switching system comprising: a. total load measuring means arranged to monitor an electrical supply; b. switch means connectible to control the supply of electrical power from said supply to partial load means forming a substantial part of a total load, but not forming the total load; and c. control means arranged to transfer the switch means between a closed condition in which said partial load means are energised as part of said total load from said supply, and an open condition in which said partial load means are no longer so energised; the control means being arranged to receive an input signal from said total load measuring means and to cause transfer of the switch means between the closed condition and the open condition when a first predetermined total load is exceeded; and further to effect a transfer of the switch means between the open condition and the closed position only when the total load falls to less than a second predetermined total load, the difference between the first predetermined total load and the second predetermined total load being larger than the maximum power which the said partial load means can extract from said supply.
Claim 3
Dependent Claim
76 words
The system of claim 1, wherein the electrical supply is an alternating current supply and the switch means are pulse operated electronic switches of the type which conduct during each half cycle of the supply only when triggered by such a pulse, and the control means supply such triggering pulses to the switch means to cause conduction; whereby the current controlled by the switch means is made and broken only during zero current voltage crossing points.
Claim 4
Dependent Claim
11 words
The system of claim 2, wherein the switch means are Triacs.
Claim 5
Dependent Claim
53 words
The load monitoring system of claim 2, wherein the control means includes a lower power solid state pulse generating device, the output from that device is applied to pulse triggered Triac devices, and those Triac devices are arranged to provide more powerful trigger pulses to heavy current Triacs which constitute said switch means.
Claim 6
Dependent Claim
42 words
The system of claim 2, wherein an isolating pulse transformer is provided with a primary winding arranged to receive said triggering pulses and with a secondary winding, electrically isolated from said primary winding, arranged to apply said pulses to the switch means.
Claim 7
Dependent Claim
52 words
The system of claim 4, wherein an Isolating pulse transformer is provided with a primary winding arranged to receive triggering pulses from the low power solid state pulse generating device, and with a secondary winding, electrically isolated from said primary winding, arranged to apply said pulses to the pulse triggered Triac devices.
Claim 8
Dependent Claim
25 words
The system of claim 2, wherein the total load measuring means includes a current transformmer arranged to monitor the total load extracted from said supply.
Claim 9
Dependent Claim
29 words
The system of claim 2, wherein the total load measuring means includes a current transformer of a type utilising a lead of the power supply as its primary winding.
Claim 10
Dependent Claim
85 words
The system of claim 2, wherein the control means are provided with pulse generating means and the pulse generating means are provided with an ''''inhibit'''' input connection; and a switch device arranged to be responsive to a variable quantity affected by the operation of the partial load means is connected to said ''''inhibit'''' input connection in such a manner that upon said variable quantity reaching a predetermined value, the ''''inhibit'''' input connection is effective to stop the emission of pulses by the pulse generating means.
Claim 11
Dependent Claim
26 words
The system of claim 1, as applied to a total electrical load which includes electrical heater means for a swimming pool as said partial load means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |