Device system and method for controlling the supply of power to an electrical load

• US 4,020,358 A
• Filed: 12/16/1975
• Issued: 04/26/1977
• Est. Priority Date: 12/16/1975
• Status: Expired due to Term

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Wyland, Alvin D.
• Primary Examiner(s): Scott, James R.
• Assistant Examiner(s): Ginsburg, Morris
• Application Number:
  US05/641,331
• Time in Patent Office: 497 Days
• Field of Search: 307/39, 307/141, 307/141.4, 307/141.8, 307/140, 307/38, 307/34, 307/35, 307/62, 307/117, 307/41, 236/46 R, 235/151.21, 235/92 T, 235/92 MT
• US Class Current: 307/39
• CPC Class Codes: G05D 23/1913 delivering a series of pulses
• CPC Class Codes: G05D 23/24 the sensing element having a resistance varying with temperature, e.g. a thermistor

Abstract

A device for controlling the supply of power to an electrical load. The device has means for timing through selected cyclical time periods and means for actuating the timing means upon the occurrence of a certain condition. Means is provided for establishing another certain condition generally during a part of each cyclical time period, and means is also provided for inhibiting the supply of power to the load upon the occurrence of both the first named and other certain conditions.

Other devices, systems and methods for controlling or proportioning the supply of power to an electrical load are also disclosed along with a method of statistically staggering power consumption by a plurality of loads and a power distribution network for supplying power to a plurality of loads.

Claims

1. A device for controlling the supply of power to an electrical load comprising timing means operable generally for establishing timing signals at a predetermined repetitive rate;

condition responsive means for effecting the operation of said timing means upon the occurrence of a preselected condition including a temperature sensitive impedance adapted for sensing atmospheric temperature, and a Schmitt trigger circuit responsive to a voltage change across said temperature sensitive impedance for providing an output signal to effect the operation of said timing means when the sensed atmospheric temperature attains a preselected value which constitutes the preselected condition;

a counter device including means for counting the timing signals at the predetermined repetitive rate thereof and operable generally to repetitively increment from an initial count to a maximum count in response to the timing signals, means for determining a selected count of said counting means generally between the initial count and the maximum count thereof, and means for providing another output signal upon the occurrence of the selected count of said counting means;

gate means having inputs for respectively receiving the first named and other output signals;

a semiconductor device coupled with said gate means and adapted to be rendered conductive in response to an output signal from said gate means; and

a gate controlled solid state switching means having its gate coupled with said semiconductor device, said switching means being enabled for effecting the supply of power to the load when said semiconductor device is conductive and said switching means being disabled for inhibiting the supply of power to the load when said semiconductor device is non-conductive.

2. A device for controlling the supply of power to an electrical load comprising means for timing through selected cyclical time periods, means for actuating said timing means upon the occurrence of a preselected ambient condition, means responsive to the actuation of said timing means for establishing another preselected condition generally during at least a part of each cyclical time period, and means for inhibiting the supply of power to the load upon the occurrence of both the first named and other preselected conditions.

3. A device as set forth in claim 2 further comprising means coupled with said inhibiting means for delaying the supply of power to the load upon the elimination of at least one of the first named and other preselected conditions.

4. A device as set forth in claim 2 wherein said actuating means includes means for sensing atmospheric temperature, the first named preselected condition comprising the atmospheric temperature attaining a preselected value thereof.

5. A device as set forth in claim 4 wherein said sensing means comprises a temperature sensitive impedance.

6. A device as set forth in claim 2 wherein said actuating means includes means for providing a signal to effect the actuation of said timing means so long as the first named preselected condition exists.

7. A device as set forth in claim 6 wherein said signal providing means comprises a Schmitt trigger circuit.

8. A device as set forth in claim 2 wherein said inhibiting means includes gate controlled solid state switching means operable generally between a conductive state so as to effect the supply of power to the load and a nonconductive state so as to effect the inhibiting of the supply of power to the load, the gate of said switching means being coupled with said actuating means and said establishing means.

9. A device as set forth in claim 2 wherein said establishing means includes means for counting through each cyclical time period of said timing means upon the actuation thereof and operable generally to establish an output signal during the at least part of each cyclical time period, the established output signal comprising the other preselected condition.

10. A device as set forth in claim 2 wherein said establishing means includes a counter operable generally to repetitively increment throughout a predetermined counting range correlated with each cyclical time period of said timing means, the output signal being established at a selected count of said counter between an initial count and a maximum count of the predetermined counting range thereof and continuing thereafter for at least consecutive counts of said counter.

11. A device for controlling the supply of power to an electrical load comprising timing means operable generally upon actuation for providing timing signals of a predetermined repetition rate;

condition responsive means for actuating said timing means so long as a preselected ambient condition exists;

counter means for counting the timing signal repetitions and for providing an output signal upon reaching a predetermined count; and

gate means responsive to the joint occurrence of the output signal from said counter means and the continued existence of the preselected condition for inhibiting the supply of power to the load.

12. A device as set forth in claim 11 wherein said condition responsive means includes means for sensing atmospheric temperature.

13. A device as set forth in claim 12 wherein said condition responsive means further includes means responsive to said sensing means for effecting the actuation of said timing means when the sensed atmospheric temperature attains a selected value which comprises the preselected condition.

14. A device as set forth in claim 11 wherein said counter means includes means adapted for repetitively incrementing between an initial count and a maximum count and returning on the next increment thereof to the initial count in response to the predetermined repetition of the timing signals.

15. A device as set forth in claim 11 further comprising means coupled with said counter means for selectively determining the predetermined count thereof.

16. A device as set forth in claim 11 further comprising means for maintaining the count of said counter means generally constant when said gate means inhibits the supply of power to the load.

17. A device as set forth in claim 11 further comprising means for predeterminately delaying the supply of power to the load subsequent to the operation of said gate means for inhibiting the power supply to the load.

18. A device as set forth in claim 11 wherein said gate means comprises at least a gate controlled solid state switching means operable generally between conductive and nonconductive states and having its gate coupled with said counter means and said condition responsive means, respectively, the gate being disabled upon the elimination of at least one of the output signal and the preselected condition so as to render said switching means nonconductive for effecting the inhibiting of the supply of power to the load.

19. A device as set forth in claim 11 wherein said gate means includes a NAND gate having inputs for receiving the output signal of said counter means and an actuating signal from said condition responsive means, a semiconductor device adapted to be rendered conductive by an output signal from said NAND gate, and a gate controlled solid state switching means having its gate enabled when said semiconductor device conducts thereby to effect the supply of power to the load and disabled when said semiconductor device is nonconducting thereby to effect the inhibiting of the supply of power to the load.

20. A device for controlling the supply of power to an electrical load comprising means for monitoring an ambient condition, means for counting through a predetermined counting range when the monitored condition meets a preselected criteria therefor, and means for inhibiting the supply of power to the load so long as the count of said counting means is within at least a preselected part of the predetermined counting range.

21. A device as set forth in claim 20 wherein said counting means includes means operable generally for incrementing generally between an initial count and a maximum count which comprises the predetermined counting range.

22. A device as set forth in claim 20 further comprising means for predetermining the at least part of the predetermined counting range.

23. A device as set forth in claim 20 further comprising means operable generally for defining a percentage of the predetermined counting range so that such percentage comprises the at least part of the predetermined counting range.

24. A system for controlling the supply of power from a source thereof to an electrical load, the system comprising circuit means for connection in circuit relation with the power source including means for monitoring an ambient condition, means for counting through a predetermined counting range when the monitored condition attains a preselected criteria thereof, and means adapted to be coupled in circuit relation with the load so as to control the supply of power thereto from the power source and operable generally for effectively interrupting the power supply when the count of said counting means is within a selected part of the predetermined counting range thereof.

25. A system for controlling the supply of power from a source thereof to an electrical load, the system comprising circuit means adapted to be energized from the power source including timing means operable generally for providing repetitive timing signals, condition responsive means for actuating said timing means upon the occurrence of a preselected ambient condition, counter means for counting the timing signals and operable generally to establish an output signal upon reaching a predetermined count, and means coupled in circuit relation with the load and operable generally for inhibiting the supply of power thereto from the source upon the joint occurrence of the output signal and preselected condition.

26. A system as set forth in claim 25 wherein said counter means includes means responsive to the timing signals for repetitively incrementing generally between an initial count and a maximum count, the predetermined count being subsequent to the initial count and the output signal continuing from the predetermined count at least for selected consecutive counts thereafter so as to establish a duty cycle for the load.

27. A system as set forth in claim 26 wherein the duty cycle of the load is independent of the rate of the repetitive timing signals of said timing means.

28. A system as set forth in claim 25 wherein the time interval during which the supply of power to the load is inhibited is inversely proportional to the rate of the repetitive timing signals of said timing means.

29. A system as set forth in claim 25 wherein said circuit means further includes means for maintaining the count of said counter means generally constant in the event said circuit means is deenergized.

30. A system as set forth in claim 25 wherein said inhibiting means is also operable generally upon the elimination of at least one of the output signals and the preselected condition to again effect the supply of power from the power source to the load, and wherein said circuit means further includes means for delaying the supply of power to the load at least subsequent to the power supplying effecting operation of said inhibiting means.

31. A system as set forth in claim 25 further comprising other condition responsive means operable generally in response to another preselected condition for controlling the supply of power from the power source to both said circuit means and the load.

32. In a power distribution network for supplying power to a plurality of loads, a plurality of power proportioning devices for statistically staggering the supply of power to the loads, respectively, so long as preselected conditions exist, each of said devices comprising timing means operable upon actuation for providing timing signals of a predetermined repetition rate, means responsive to the occurrence of one of the preselected conditions for actuating said timing means, means for counting the timing signals and operable generally to establish an output signal comprising another of the preselected conditions upon reaching a predetermined count, and means responsive to the joint occurrence of the one preselected condition and the other preselected condition for inhibiting the supply of power to the load, the repetition rates of said timing means for at least some of said devices being generally dissimilar so as to statistically stagger both the initial energization and the duty cycles of the respective loads.

33. A method of proportioning the supply of power to a load comprising the steps of:

a. monitoring an ambient condition;

b. initiating a timed cyclical count so long as the monitored condition meets preselected criteria; and

c. inhibiting the supply of power to the load so long as the count falls within at least a part of predetermined range of the timed cyclical count.

34. A method of statistically staggering power consumption by a plurality of loads comprising the steps of:

a. counting modulo n for at least some of the loads at counting rates which differ from one another; and

b. disabling given ones of the loads when its corresponding count exceeds a preselected count individual to the given ones of the loads which number is less than n.

35. A method of proportioning the supply of power to a load comprising the steps of:

a. monitoring an ambient condition;

b. timing through selected cyclical time periods when the monitored condition attains preselected criteria therefor;

c. establishing an electrical signal during a selected part of each cyclical time period; and

d. inhibiting the supply of power to the load upon the establishment of the electrical signal when the preselected criteria for the monitored condition is met.

36. A system for controlling the supply of power from a power source to an electrical load device connected in a circuit therewith and adapted for altering the temperature of a selected space, the system comprising condition responsive means operable generally in response to the temperature of the selected space for respectively interrupting and completing the circuit so as to control energization of the load device and maintain the temperature of the selected space generally at a preselected value;

controlling means coupled with said condition responsive means and the load device and operable generally upon the occurrence of a preselected condition for inhibiting the supply of power for at least a preselected period of time from the power source to the load device when said condition responsive means is operable generally to complete the circuit between the power source and the load device; and

means for maintaining a limited supply of power from the power source to at least a part of said controlling means when said condition responsive means is operable generally to interrupt the circuit between the power source and the load device.