Abstract: An LLC resonant power regulator system includes a transformer having a primary inductor and a secondary inductor and an input resonant tank including an input resonant capacitor, an input leakage inductor, and the primary inductor connected in series. The system also includes an input stage having a plurality of switches that are controlled in response to a respective plurality of switching signals sweeping frequency to supply an input resonant current to the input resonant tank. Each of the respective plurality of switching signals can have a fixed duty cycle and a sweeping frequency. The system further includes an output resonant tank that includes an output resonant capacitor, an output leakage inductor, and the secondary inductor connected in series. The output resonant tank can be configured to generate an oscillating output resonant current at an output.

Abstract: An LLC resonant power regulator system (10) includes a transformer (22) comprising a primary inductor (20) and a secondary inductor (26) and an input resonant tank (18) comprising an input resonant capacitor, an input leakage inductor, and the primary inductor (20) connected in series. The system also includes an input stage (14) comprising a plurality of switches (16) that are controlled in response to a respective plurality of switching signals sweeping frequency to supply an input resonant current to the input resonant tank (18). Each of the respective plurality of switching signals can have a fixed duty cycle and a sweeping frequency. The system (10) further comprises an output resonant tank (24) comprising an output resonant capacitor, an output leakage inductor, and the secondary inductor (26) connected in series. The output resonant tank (24) can be configured to generate an oscillating output resonant current at an output.

Abstract: An LLC resonant AC/DC power regulator system (10) includes a transformer (20) comprising a primary inductor and a secondary inductor. An LLC resonant tank (18) is configured to have first and second resonant frequencies. A full-bridge is coupled between first and second voltages and includes a first pair of switches coupled between the first and second voltages and a second pair of switches coupled between the first and second voltages. The LLC resonant tank (18) is coupled between a first node that interconnects the first pair of switches and a second node that interconnects the second pair of switches. The switches (16) are activated and deactivated to generate a resonant current through the LLC resonant tank (18) in response respective switching control signals. The respective switching control signals have fixed frequency and regulated duty-cycle to activate the plurality of switches in a zero voltage switching (ZVS) manner.