Transfer switch with delayed optimal power transfer

A method for performing a transfer of power, the method comprising:

• receiving, at a control circuit, a specified transfer time window defined by a user input for transferring power to a load from a first power source to a second power source, wherein the specified transfer time window includes a minimum delay and a maximum delay;
• receiving, at the control circuit, a command to transfer power to the load from the first power source to the second power source;
• measuring, using a measurement circuit, a phase difference between power provided by the first power source and power provided by the second power source;
• and
• transferring power to the load from the first power source to the second power source in response to the phase difference falling below a threshold value within the specified transfer time window.

A system for performing an optimized transfer of electrical power, the system comprising:

• a first power source configured to provide electrical power to a load;
• a second power source configured to provide electrical power to the load;
• a static transfer switch configured to selectively couple the load to one of the first power source and the second power source;
• a measurement circuit configured to measure a phase difference between power provided by the first power source and power provided by the second power source, wherein the measurement circuit is further configured to determine a rate of change of the phase difference;
• and
• a control circuit coupled to the measurement circuit and to the static transfer switch, the control circuit configured to:
• receive a user-defined transfer time window comprising a minimum delay and a maximum delay;
• receive a command to transfer power from the first power source to the second power source;
• predict, based on a measured rate of change of the phase difference, an optimal transfer time within the transfer time window;
• and
• assert a switch signal to the static transfer switch to perform the transfer of power at the predicted optimal transfer time when the phase difference is below a threshold value and the minimum delay has elapsed.