Charge demand controller device

1. A charge demand controller device for an electric vehicle for connecting between a main switch of a service utility box of a utility service provider and an electrical panel configured to handle a predetermined maximum amperage value, said device comprising:

a box unit for mounting on a surface and having an input line connector for electrical connection with the main switch, an output line connector for electrical connection with the electrical panel, and an output load connector for electrical connection with an electric vehicle supply equipment (EVSE) external load, the box unit electrically mounting between the main switch and the control panel, the output load connector electrically connecting to the input line connector via a load switch; and

a controller unit mounting in the box unit and connecting to the input line connector and the output load connector, the controller unit constantly monitoring an actual total load current at the input line connector, and selectively operating the load switch upon the actual total load current being above or below a trip value being a predetermined safety ratio of the predetermined maximum amperage value;

the controller unit including a predetermined trip delay value, the controller unit switching off the load switch upon the actual total load current remaining above the trip value for a trip time duration being equal to or larger than the predetermined trip delay value;

the controller unit further including a predetermined off delay value and a predetermined maximum amperage load charge value of the device, the controller unit switching back on the load switch upon the actual total load current remaining below the trip value minus the predetermined maximum amperage load charge value for an actual off time duration being equal to or larger than the predetermined off delay value.

2. The device of claim 1 , further including a switch contactor coil electrically connected to the controller unit and operatively connected to the load switch.

3. The device of claim 2 , wherein the controller unit includes a modulator unit electrically connected between the input line connector and the load switch, the modulator unit modulating a load charge power reaching the output load connector depending on the actual total load current.

4. The device of claim 3 , wherein the modulator unit ensures that the actual total load current does not exceed the trip value for more than a predetermined trip delay value.

5. The device of claim 1 , wherein, while the actual off time duration is smaller than the predetermined off delay value and upon the actual total load current being equal or larger than the trip value minus the predetermined maximum amperage load charge value, the controller unit verifying that the actual total load current remains equal or larger than the trip value minus the predetermined maximum amperage load charge value for a trip time duration being equal to or larger than the predetermined trip delay value to allow turning back on the load switch, and, upon the actual total load current being less than the trip value minus the predetermined maximum amperage load charge value, to maintain the load switch off and resume comparing the actual off time duration with the predetermined off delay value until the actual off time duration is equal to or larger than the predetermined off delay value before allowing turning back on the load switch or maintaining the load switch off upon the actual total load current remaining below the trip value minus the predetermined maximum amperage load charge value for another actual off time duration being equal to or larger than the predetermined off delay value.

6. The device of claim 5 , further including an input unit electrically connected to the controller unit, the input unit transmitting at least one operating value received from an operator to the controller unit, a first one of the at least one operating value being the predetermined maximum amperage value, a second one of the at least one operating value being the predetermined trip delay value, a third one of the at least one operating value being the predetermined maximum amperage load charge value, and a fourth one of the at least one operating value being the predetermined off delay value.

7. The device of claim 6 , wherein a fifth one of the at least one operating value being the predetermined safety ratio.

8. The device of claim 1 , wherein the controller unit includes at least one current sensor electrically connected to the input line connector to determine the actual total load current running through the input line connector.

9. The device of claim 8 , wherein the input line connector connects to a plurality of power lines connecting to the main switch, the controller unit including one of the at least one current sensor electrically connected to each one of the plurality of power lines.

10. The device of claim 9 , wherein the controller unit determines the actual total load current being the largest one of the current measured by the at least one current sensor.

11. The device of claim 10 , wherein the predetermined safety ratio is 80% of the predetermined maximum amperage value.

12. The device of claim 1 , wherein the controller unit automatically turns off the load switch upon the actual total load current being larger than a load upper limit below the predetermined maximum amperage value.

13. The device of claim 12 , wherein the load upper limit is 90% of the predetermined maximum amperage value.