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US 12,456,923 B2Granted
Switched-inductor power converter, communication system, and method coupled with leakage inductor
AssigneeHuawei Digital Power Technologies Co., Ltd.
InventorsZhengyan He, Jiebin Cheng, Chao Wu
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Abstract
This application discloses a switched-inductor power converter, a communication system, and a method. The switched-inductor power converter includes a coupling winding and a unidirectional conduction circuit, and the coupling winding and the unidirectional conduction circuit are connected in series to form a closed loop. A leakage inductor is formed after the coupling winding and a power inductor are magnetically coupled. Existence of the leakage inductor and the unidirectional conduction circuit may suppress a reverse recovery stress of a first diode, to further reduce a reverse recovery current of the first diode, and reduce a reverse recovery loss of the first diode.
Claims20
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.
6 more elements
A communication system, wherein the communication system comprises:
- a remote radio unit (RRU);
- and
- a switched-inductor power converter;
- wherein a positive electrode of the converter is connected to a positive electrode of a power supply, a negative electrode of the converter is connected to a negative electrode of the power supply, the positive electrode of the power supply is ground, and the negative electrode of the power supply is configured to provide a negative voltage;
- and
- wherein an output terminal of the converter is configured to supply power to the RRU, wherein the switched-inductor power converter, comprises:
- 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.
12 more elements
A control method for a switched-inductor power converter, wherein the switched-inductor power converter, comprises:
- 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.
7 more elements
Dependencies are inferred from the claim text.