A circuit for delivering a predetermined amount of energy to a load without regulating the voltage across the load is described. An a.c. or rectified sine wave is controlled. There is no capacitive smoothing of the applied voltage. A time counter is activated at the beginning of each half cycle of the...http://www.google.com.au/patents/US4764858?utm_source=gb-gplus-sharePatent US4764858 - Energy controller
