Patent ID: 6791208
Filing Date: 2004-09-14
Classification: H02J

Abstract:
An electrical power controller comprising:A utility power source output and a backup power source output; a transfer switch coupled to said utility power source output and said backup power source output; a power controller coupled to said utility power source output; an automatically controlled load having sensors coupled to said power controller inputs; other power loads coupled to an output of said transfer switch; a first relay coupled between said automatically controlled load and said transfer switch output and said backup power source output; a second relay coupled between a control output of said transfer switch and a control input of said backup power source; and said first and second relays coupled to and controlled by said power controller; wherein said transfer switch is configured to couple to said utility power source output to said other power loads and said automatically controlled load at said output of said transfer switch and is configured to output at said control output a stop signal to said backup power source when said utility power source is operating normal and is configured to couple said backup power source output to said other power loads and said automatically controlled load when said utility power source fails and is configured to output at said control output a start signal to said backup power source; during said utility power failure said power controller couples said backup power source directly to said automatically controlled load through said first relay and disables a stop signal from said control output of said transfer switch through said second relay when said sensors of said automatically controlled load request said automatically controlled load to be turned on; and after said utility power resumes said power controller recouples said automatically controlled load to said transfer switch through said first relay and enables a stop signal from said control output of said transfer switch through said second relay only when said sensors request said automatically controlled load be turned off.