Smart plug with internal condition-based demand response capability
A smart load switch or smart plug incorporates a built-in circuit that can monitor a physical variable condition and compare that sensed condition to data stored in a memory. A controller receives input data from the measuring device, compares the data to the reference data in memory, and selectively controls the on/off condition of a switch and thus the device that is plugged into the switch.
1. A smart load switch for monitoring a physical variable condition and controlling operation of an associated plug-in device in response to the monitored condition comprising:
a housing;
a measuring device configured to monitor a physical variable condition, the measuring device isolated from any components within the housing of the smart load switch that interfere with the physical variable condition;
a memory configured to store data relating to reference conditions; and
a controller configured to at least (i) receive input data from the measuring device, (ii) compare the data to the reference data stored in memory, and (iii) selectively control an on/off condition of the switch to, in turn, control operation of the associated remote plug-in device;
wherein the measuring device, the memory and the controller are located within the housing.
2. The smart load switch of claim 1 wherein the measuring device is a transducer that provides an output signal indicative of the physical variable.
3. The smart load switch of claim 2 wherein the transducer is one of a thermocouple and thermistor.
4. The smart load switch of claim 1 further comprising a transceiver that receives the input data from the measuring device.
5. The smart load switch of claim 4 wherein the transceiver is configured to communicate in a wireless or wired format.
6. The smart load switch of claim 5 further comprising a receptacle to accept a connector from a remote hard-wired transducer.
7. The smart load switch of claim 5 wherein the transceiver is configured to receive data regarding utility pricing data or peak demand events, the controller is operative to compare the utility pricing data or peak demand events with stored data in the memory, and to alter operation of the switch in response thereto.
8. The smart load switch of claim 7 wherein the controller changes the reference data in response to a peak pricing or demand event.
9. The smart load switch of claim 1 further comprising an interface that allows access and selection capability for a user.
10. The smart load switch of claim 1 further comprising a short cycling preventer that precludes immediate restart after a shutdown.
11. The smart load switch of claim 10 wherein the short cycling preventer includes a time delay for ensuring a minimum on or off time for the associated plug-in device.
12. The smart load switch of claim 1 further comprising a current sensor that is operatively associated with the controller and monitors current used by the associated remote plug-in device.
13. A method of controlling a remote plug-in device comprising:
providing a load switch comprising a housing, a measuring device configured to monitor a physical variable condition, the measuring device isolated from any components within the housing that interfere with the physical variable condition, a memory, and a controller, wherein the measuring device, the memory and the controller are located within the housing;
measuring the physical variable condition with the measuring device;
storing data in the memory relating to set point conditions;
receiving input data from the measuring step and comparing the measured data to the set point data stored in the memory; and
selectively controlling an on/off condition of the load switch in response to reaching the set point condition and, in turn, controlling operation of the associated remote plug-in device.
14. The method of claim 13 further including receiving the input data from the measuring device and changing the on/off condition of a smart plug that receives the associated remote plug-in device.
15. The method of claim 13 further including delaying/maintaining operation of the associated plug-in device for a minimum time period.
16. The method of claim 13 further including evaluating a rate of change of a sensed temperature to determine if the switch is controlling a heating or cooling mode.
17. The method of claim 13 further including evaluating a rate of change of any variable to determine at least one of multiple operating modes of the device plugged in to the smart energy switch.
18. The method of claim 13 further including providing an interface to allow a user to select set points and modes of operation of the associated plug-in device.
19. The method of claim 13 wherein the measuring step includes measuring a temperature of the room, and the set point conditions are preselected temperatures.
20. The method of claim 19 further comprising altering the set point temperatures in response to a peak demand signal.