2016-08-242016-08-241989-09-12http://hdl.handle.net/10919/72352A multi-loop controller for controlling a quasi-resonant converter having a power switch, a filter inductor and an output voltage. The controller includes a sensor circuit for sensing the output voltage of the converter. A detector monitors the filter inductor current of the converter. The output voltage is compared with a known reference voltage to develop a control error voltage when the output voltage exceeds the reference voltage. A comparing circuit then compares the inductor current with the control error voltage and produces a control signal when a predetermination relationship has been detected. Finally, an activating circuit responsive to the control signal turns the power switch on.application/pdfen-USPatenthttp://pimg-fpiw.uspto.gov/fdd/67/663/048/0.pdf7179927323/287323/290363/21.4H02M3/33507H02M3/1563Y02B70/1425Y02B70/14334866367