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Load management and switching devices and methods

  • US 10,193,381 B2
  • Filed: 09/27/2016
  • Issued: 01/29/2019
  • Est. Priority Date: 09/27/2016
  • Status: Active Grant
First Claim
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1. A method for managing loads supplied by a secondary power source, the method comprising the steps of:

  • providing a first set of normally closed relays electrically connected to a first plurality of loads;

    providing a second set of normally closed relays electrically connected to a second plurality of loads;

    providing a first timer electrically connected to the first set of relays and set to a predetermined amount of time;

    providing a second timer electrically connected to the second set of relays and set to a predetermined amount of time, wherein the set time of the second timer is greater than the set time of the first timer;

    providing a first current transformer;

    providing a second current transformer;

    wherein the first and second current transformers receive a current draw from the secondary power source and produce an actual voltage proportional to the current passed through each of the first and second current transformers;

    providing a reference voltage, wherein the reference voltage is a voltage equal to a predetermined percentage of a maximum allowable current draw from the secondary power source;

    monitoring the actual voltage;

    comparing the reference voltage with the actual voltage; and

    when the actual voltage exceeds the reference voltage;

    opening both the first and second set of relays;

    starting both the first and second timers;

    when the set time of the first timer elapses, close the first set of relays; and

    when the set time of the second timer elapses, close the second set of relays.

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