US 12,456,923 B2
Switched-inductor power converter, communication system, and method coupled with leakage inductor
Zhengyan He, Nuremberg (DE); Jiebin Cheng, Dongguan (CN); and Chao Wu, Kista (SE)
Assigned to Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed by Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed on Nov. 29, 2022, as Appl. No. 18/071,358.
Application 18/071,358 is a continuation of application No. PCT/CN2020/093115, filed on May 29, 2020.
Prior Publication US 2023/0097153 A1, Mar. 30, 2023
Int. Cl. H02M 3/158 (2006.01); H02M 1/00 (2007.01); H02M 3/155 (2006.01)
CPC H02M 3/1582 (2013.01) [H02M 1/0051 (2021.05); H02M 3/1552 (2021.05); H02M 1/0043 (2021.05)] 20 Claims
OG exemplary drawing
 
1. A switched-inductor power converter, comprising: a main switch, a power inductor, a coupling winding, a unidirectional conduction circuit, a first diode, and a controller, wherein:
when the main switch is closed, the power inductor stores energy from a power supply, when the main switch is open, the power inductor is disconnected from the power supply to release energy, and the first diode provides a freewheeling path when the power inductor releases the energy;
the coupling winding and the power inductor are magnetically coupled, and a leakage inductor is formed after the coupling winding and the power inductor are magnetically coupled;
a first terminal of the unidirectional conduction circuit is connected to a first terminal of the coupling winding, and a second terminal of the unidirectional conduction circuit is connected to a second terminal of the coupling winding, and one terminal that is of the power inductor and that is connected to a positive electrode of the power supply and the first terminal of the coupling winding are dotted terminals;
the controller is configured to: in each switching cycle of the main switch, control the unidirectional conduction circuit to be broken before the main switch is open, and is further configured to control the unidirectional conduction circuit to be conducted before the main switch is closed, wherein a direction of a current existing when the unidirectional conduction circuit is conducted is that the current flows out from the second terminal of the coupling winding; and
the leakage inductor is configured to resonate with a parasitic capacitor of the main switch and/or a parasitic capacitor of the first diode when the unidirectional conduction circuit is conducted,
wherein a ratio of inductance of the leakage inductor to inductance of a magnetically coupled excitation inductor is less than 10%, and a time period existing after the unidirectional conduction circuit is conducted and before the main switch is closed is less than or equal to 5% of the switching cycle.