Patent ID: 8049155
Filing Date: 2011-11-01
Classification: H03K

Abstract:
1. A method of energy saving in an active infrared induction instrument comprising the steps of: evaluating a group of received signals from a photodiode; comparing the group of received signals with a reference voltage utilizing a comparator; supplying an output of the comparator to a transistor; cutting off the transistor and not collecting pulses if the base level of the transistor is higher than an emitter level of the transistor; turning on the transistor and collecting and recording pulses if the base level of the transistor is lower than an emitter level of the transistor; adjusting the pulse width of an infrared emitter via software on an integrated circuit chip dependent on whether a group of pulses collected is judged to be strong or weak if the integrated circuit chip does not posses interrupting functionality; and adjusting the pulse width of an infrared emitter via an interrupt if the integrated circuit chip contains interrupting functionality.