Managed electrical outlet for providing rank-ordered over-current protection

• US 5,844,326 A
• Filed: 06/23/1997
• Issued: 12/01/1998
• Est. Priority Date: 06/23/1997
• Status: Expired due to Term

• Current Assignee: Schneider Electric Solar Inverters Usa, Inc. (Schneider Electric SE)
• Original Assignee: Cruising Equipment Company, Inc.
• Inventors: Schaper, Scott R., Proctor, Richard L.
• Primary Examiner(s): Gaffin, Jeffrey A.
• Assistant Examiner(s): HUYNH, KIM NGOC
• Application Number:
  US08/881,715
• Time in Patent Office: 526 Days
• Field of Search: 307/125, 307/131, 307/139, 307/38, 307/39, 307/11, 307/12, 307/31, 307/32, 307/34, 361/93, 361/100, 327/175
• US Class Current: 307/34
• CPC Class Codes: H02H 3/033 with several disconnections in a preferential order, e.g. following priority of the users, load repartitionH02H3/06 takes precedence
• CPC Class Codes: H02H 3/08 responsive to excess current responsive to abnormal temperature caused by excess current H02H5/04
• CPC Class Codes: H02J 2310/60 Limiting power consumption in the network or in one section of the network, e.g. load shedding or peak shaving
• CPC Class Codes: H02J 3/14 by switching loads on to, or off from, network, e.g. progressively balanced loading
• CPC Class Codes: Y02B 70/3225 Demand response systems, e.g. load shedding, peak shaving
• CPC Class Codes: Y04S 20/222 Demand response systems, e.g. load shedding, peak shaving

Abstract

A managed electrical outlet includes a plurality of electrical receptacles, a current sensor, logic circuitry, a switch driver, and one or more switches. The electrical current provided to the managed electrical outlet is measured by the current sensor, which in turn sends an electrical signal to the logic circuit, representative of the amount of electrical current flowing through the outlet. The logic circuit compares the level of current flowing through the outlet with a reference current level to determine whether an over-current state exists. If the logic circuit determines the presence of an over-current state, the logic circuit sends a signal to the switch driver, causing the switch driver to trigger the switch into an open-circuit condition. In a two-receptacle outlet, one of the two receptacles is coupled to the switch while the other receptacle is unmanaged. Thus, in an over-current condition, current continues to be provided to the unmanaged receptacle while the managed receptacle (connected to the switch) is disabled.

Claims

1. A managed electrical outlet for supplying electrical power to one or more loads, comprising:

a managed receptacle;

an unmanaged receptacle;

a pair of input terminals connected to provide power to the managed and unmanaged receptacles;

a current sensor coupled between either one of the pair of input terminals and the managed and unmanaged receptacles for sensing the total current magnitude flowing through the current sensor and consumed by the one or more loads connected to the managed receptacle and the unmanaged receptacle;

a logic circuit connected to the current sensor and configured to produce an output signal indicative of an over-current condition when the current magnitude sensed by the current sensor exceeds a reference current level; and

a switch coupled to the managed receptacle and responsive to the signal from the logic circuit to disable the current flow through the managed receptacle.

2. The managed electrical outlet of claim 1, further comprising a switch driver coupled between the logic circuit and the switch.

3. The managed electrical outlet of claim 1, further comprising a means for indicating whether the managed receptacle is enabled or disabled.

4. The managed electrical outlet of claim 1, wherein the reference current level is an adjustable current level.

5. The managed electrical outlet of claim 1, further comprising an additional managed receptacle coupled to a controller, wherein the controller is responsive to a signal from the logic circuit to provide a reduced power level to a load connected to the additional managed receptacle.

6. The managed electrical outlet of claim 1, wherein the managed electrical outlet is contained within a housing and includes a set of two electrical connectors projecting from the housing connectable to a standard electrical receptacle.

7. The managed electrical outlet of claim 1, further comprising an additional managed receptacle in parallel with the managed receptacle and an additional switch connected between the logic circuit and the additional managed receptacle, wherein the additional switch is responsive to an additional signal from the logic circuit to disable the current flow through the additional managed receptacle.

8. The managed electrical outlet of claim 1, further comprising:

a plurality of managed receptacles; and

a plurality of switches, each one of the plurality of switches being associated with a different one of the plurality of managed receptacles and responsive to a signal from the logic circuit to disable current flow through the associated managed receptacle.

9. The managed electrical outlet of claim 8, wherein the logic circuit includes a means for signaling the switches on a ranked priority basis in response to an over-current condition.

10. A managed electrical outlet for supplying electrical power to one or more loads, comprising:

a managed receptacle;

an unmanaged receptacle;

a pair of input terminals connected to provide power to the managed and unmanaged receptacles;

a means for sensing the magnitude of electrical current flowing between the input terminals and consumed by the one or more loads connected to the managed receptacle and the unmanaged receptacle;

a logic means, responsive to the sensing means, for comparing the magnitude of current consumed by the one or more loads connected to the managed receptacle and the unmanaged receptacle with a reference current level and producing an output signal indicative of an over-current condition when the sensed current magnitude exceeds the reference current level; and

a means for disabling the current flow through the managed receptacle in response to the output signal from the logic means.

11. The managed electrical outlet of claim 10, wherein the reference current level is an adjustable current level.

12. The managed electrical outlet of claim 10, further comprising a means for indicating whether the managed receptacle is enabled or disabled.

13. The managed electrical outlet of claim 10, wherein the managed electrical outlet is contained within a housing and includes a set of electrical connectors projecting from the housing connectable to a standard electrical receptacle.

14. The managed electrical outlet of claim 10, further comprising:

a plurality of managed receptacles connected to receive power provided at the input terminals; and

a plurality of disabling means, each one of the plurality of disabling means being associated with a different one of the plurality of managed receptacles and responsive to the logic means for disabling current flow through the associated managed receptacle.

15. The managed electrical outlet of claim 14, wherein the logic means includes a means for instructing the plurality of disabling means to disable the plurality of managed receptacles on a ranked priority basis.

16. The managed electrical outlet of claim 14, further comprising a controller means coupled to one of the plurality of managed receptacles for providing a reduced power level to the managed receptacle connected to the controller means.

17. A managed electrical outlet system for supplying electrical power to one or more loads, comprising:

a first outlet having a first receptacle and a second receptacle, wherein the first receptacle is an unmanaged receptacle and the second receptacle is a managed receptacle;

a pair of input terminals connected to provide power to the first and second receptacles;

a current sensor coupled between one terminal of the pair of input terminals and the first and second receptacles for sensing the total current magnitude flowing through the current sensor and consumed by the one or more loads connected to the first and second receptacles;

a logic circuit connected to the current sensor and configured to produce an output signal indicative of an over-current condition when the current magnitude sensed by the current sensor exceeds a reference current level;

a switch coupled to the second receptacle and responsive to the signal from the logic circuit to disable the current flow through the second receptacle; and

a second outlet having a third receptacle and a fourth receptacle, wherein the third receptacle is connected to the first receptacle and the fourth receptacle is connected to the second receptacle.

18. The managed electrical outlet system of claim 17, wherein the reference current level is an adjustable current level.

19. The managed electrical outlet system of claim 17, further comprising one or more additional outlets having a pair of receptacles, wherein one of the pair of receptacles from each of the one or more additional receptacles is connected to the first receptacle and the other of the pair of receptacles from each of the one or more additional receptacles is connected to the second receptacle.