Patent ID: 7368836

Claim:
A method of connecting a load to a source, comprising the steps of: determining delay intervals based on volt-second characteristics of a load; and connecting an AC source to the load following said delay intervals, wherein said load is disconnected from disconnecting source S 1 and connected to connecting source S 2 after said delay intervals, and wherein said volt-seconds are determined based on current and voltage measurements during disconnection of source S 1 from said load, and wherein said volt-seconds are determined, for delay times Td 1 , Td 2 , and Td 3 , according to the equality VSd+VSc 1 +VSc 2 +VSc 3 =2*Aoc/Wc, where: Td 1 is the delay from the load disconnection point to the reconnection in first ½ cycle of the connecting source that occurs after disconnection; Td 2 is the delay from the load disconnection to the reconnection in second ½ cycle of the connecting source that occurs after disconnection; Td 3 is the delay from the first cross over of the third ½ cycle to the reconnection in third ½ cycle of the connecting source that occurs after disconnection; VSc 1 =volt-seconds of the first ½ cycle of the connecting source after load reconnection to the end of the ½ cycle; VSc 2 =volt-seconds of the second ½ cycle of the connecting source after load reconnection to the end of the ½ cycle; VSc 3 =volt-seconds of the third ½ cycle of the connecting source after load reconnection to the end of the ½ cycle; Aoc=peak value, in volts, of the sine wave form of the connecting source; Wc=omega=2*(PI)*Foc; Foc=connecting source frequency; Aod=peak value, in volts, of the sine wave form of the disconnecting source; Wd=omega=2*(PI)*Fod; Fod=disconnecting source frequency.