Patent ID: 9548670
Date: 2017-01-17
CPC Classifications: G01R,H02M,Y02B

Claim:
1. A method of calibrating an inductor-inductor-capacitor (LLC) resonant converter, said method comprising: operating, by a controller coupled to the LLC resonant converter, the LLC resonant converter in an open loop mode at a nominal resonant frequency and a predetermined input voltage during a calibration of the LLC resonant converter; measuring, by the controller, an open loop output voltage of the LLC resonant converter when operated at the nominal resonant frequency and the predetermined input voltage; comparing, by the controller, the measured open loop output voltage to a nominal output voltage stored in the controller to determine a polarity of a calibration factor of the LLC resonant converter; calculating, by the controller, an optimum input voltage for the LLC resonant converter as a function of the measured open loop output voltage, the calibration factor, a load current, and predefined operating tolerances that include a variation range of a resonant inductor and a resonant capacitor of the LLC resonant converter; and operating, by the controller, the LLC resonant converter in a normal operation mode at the calculated optimum input voltage to improve efficiency of the LLC resonant converter at all load conditions while accommodating the predefined operating tolerances of the resonant inductor and the resonant capacitor.