US 12,407,248 B2
Feedforward frequency response for resonant charge pump
Kuo-Chi Liu, Hsinchu (TW); Ta-Yung Yang, Taoyuan (TW); and Wei-Hsu Chang, New Taipei (TW)
Assigned to RICHTEK TECHNOLOGY CORP., Hsinchu County (TW)
Filed by RICHTEK TECHNOLOGY CORP., Hsinchu County (TW)
Filed on Mar. 20, 2023, as Appl. No. 18/123,961.
Claims priority of provisional application 63/330,771, filed on Apr. 13, 2022.
Claims priority of application No. 111141586 (TW), filed on Nov. 1, 2022.
Prior Publication US 2023/0336074 A1, Oct. 19, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H02M 3/07 (2006.01); H02M 1/00 (2006.01)
CPC H02M 3/07 (2013.01) [H02M 1/0012 (2021.05)] 24 Claims
OG exemplary drawing
 
1. A power converter comprising:
a first switch comprising a control terminal, a first terminal configured to receive an input voltage, and a second terminal;
a second switch comprising a control terminal, a first terminal coupled to the second terminal of the first switch, and a second terminal;
a third switch comprising a control terminal, a first terminal coupled to the second terminal of the second switch, and a second terminal;
a fourth switch comprising a control terminal, a first terminal coupled to the second terminal of the third switch, and a second terminal coupled to a ground terminal;
a flying capacitor comprising a first terminal coupled to the second terminal of the first switch, and a second terminal coupled to the second terminal of the third switch;
an inductor comprising a first terminal coupled to the second terminal of the second switch, and a second terminal;
an output capacitor comprising a first terminal coupled to the second terminal of the inductor and configured to output an output voltage, and a second terminal coupled to the ground terminal; and
a control circuit coupled to the control terminal of the first switch, the control terminal of the second switch, the control terminal of the third switch and the control terminal of the fourth switch, and configured to switch the first switch, the second switch, the third switch and the fourth switch according to a resonant frequency when the input voltage is less than an input threshold voltage, and switch the first switch, the second switch, the third switch and the fourth switch according to a regulated frequency exceeding the resonant frequency when the input voltage exceeds the input threshold voltage;
wherein the flying capacitor and the inductor form a resonant circuit having the resonant frequency;
when the input voltage exceeds the input threshold voltage, and the control circuit is further configured to turn off the first switch or the second switch before an inductor current of the inductor reaches 0A during magnetizing the inductor.