Patent ID: 6437994
Filing Date: 2002-08-20
Classification: H02M

Abstract:
An Inductor-Inductor-Capacitor (LLC) converter comprising:a series arrangement of a first parallel arrangement of a first switch and a first diode, and a second parallel arrangement of a second switch and a second diode, the series arrangement being coupled between a first input terminal and a second input terminal for receiving a DC input voltage, a voltage on the first terminal being positive with respect to a voltage at the second terminal, the cathode of the first diode and the cathode of the second diode being directed towards the first input terminal; a series arrangement of a capacitor, a first inductor and a second inductor coupled in parallel to one of the first diode and the second diode; a rectifier coupled to one of the first inductor and the second inductor for supplying an output voltage; and a control circuit including switching control means for controlling a frequency of an on and off switching of the first switch and the second switch, and difference detection means for detecting a difference between said output voltage and a reference value, and for controlling said switching control means on the basis of said difference, characterized in that the control circuit further comprises: current variation detection means coupled to said series arrangement of the capacitor, the first inductor and the second inductor for detecting a total current through said series arrangement, said current variation detection means being coupled to said difference detection means for correcting said frequency in dependence on variations of said total current through the series arrangement.