Patent ID: 11955884
Assignee: RICHTEK TECHNOLOGY CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 34:
35. A resonant switching power converter circuit which is configured to convert a first power to a second power or to convert the second power to the first power, wherein the first power includes a first voltage and a first current and the second power includes a second voltage and a second current, the resonant switching power converter circuit comprising:
at least one resonant tank which includes a resonant capacitor and a resonant inductor connected in series with each other;
a plurality of switches coupled to the at least one resonant tank, wherein in a resonant voltage conversion mode, the plurality of switches operate according to a first control signal and a second control signal to switch a coupling relationship of the at least one resonant tank in correspondence to a first resonant process and a second resonant process, wherein in the first resonant process a resonant charging operation is performed on the at least one resonant tank, and in the second resonant process a resonant discharging operation is performed on the at least one resonant tank;
a control circuit, configured to control the plurality of switches;
a pre-charge circuit, coupled between the control circuit and the plurality of switches except a first switch of the plurality of switches; and
at least one non-resonant capacitor, coupled to the at least one resonant tank, wherein in the resonant voltage conversion mode, the first control signal and the second control signal switching coupling relationships of the non-resonant capacitor and the at least one resonant tank, and a voltage across the non-resonant capacitor is maintained at a constant ratio to the first power;
wherein the control circuit is coupled to the first power, the second power, and the plurality of switches, wherein when the resonant switching power converter circuit operates in a pre-charge mode, the control circuit is configured to control the first switch to control a coupling relationship between the first power and the at least one resonant tank, and is configured to control the other switches of the plurality of switches so that when one or more of the resonant capacitor and the at least one non-resonant capacitor has a voltage drop which is lower than a predetermined voltage, the pre-charge circuit charges the one or more capacitors to the predetermined voltage;
wherein the first switch is coupled between the first power and the resonant capacitor;
wherein in a start-up mode, the first control signal and the second control signal operate the plurality of switches to switch coupling relationships of the resonant capacitor and the at least one non-resonant capacitor, such that after the pre-charge mode ends, the resonant switching power converter circuit operates in the start-up mode;
wherein in the start-up mode, the first control signal and the second control signal have respective ON periods which do not overlap one another, and time lengths of the ON periods increase gradually;
wherein in a resonant voltage conversion mode, the first control signal and the second control signal have respective ON periods which do not overlap one another, such that the first resonant process and the second resonant process do not overlap each other, such that after the start-up mode ends, the resonant switching power converter circuit operates in the resonant voltage conversion mode, to convert the first power to the second power or to convert the second power to the first power.