CPC H02M 3/1566 (2021.05) [G06F 1/26 (2013.01); G06F 1/266 (2013.01); H02J 7/00712 (2020.01); H02M 3/156 (2013.01); H02M 3/1584 (2013.01)] | 17 Claims |
1. A power management system comprising:
a direct current-direct current (DC-DC) conversion circuit, a first control circuit, a charging circuit, an input port, and an output port, wherein
the input port is configured to receive an input voltage;
the output port is connectable to a load, and is configured to supply an output voltage to the load;
the DC-DC conversion circuit is connected between the input port and the output port, and is configured to obtain a first feedback voltage used to reflect the output voltage from the output port, and charge the output port from the input port based on the first feedback voltage and a first reference signal, to adjust the output voltage;
the first control circuit is connected between the output port and the charging circuit, and is configured to obtain a second feedback voltage of the output voltage from the output port, generate a first control signal based on the second feedback voltage and a second reference signal, and supply the first control signal to the charging circuit;
the charging circuit is connected between the input port and the output port, and is configured to charge the output port from the input port based on the first control signal, to supplementally adjust the output voltage;
wherein the DC-DC conversion circuit comprises a second control circuit and at least one first power stage circuit, wherein
the second control circuit is configured to obtain the first feedback voltage used to reflect the output voltage from the output port, and generate at least one second control signal based on the first feedback voltage and the first reference signal;
each of the at least one first power stage circuit comprises a first transistor, a second transistor, and an inductor, wherein a first terminal of the first transistor is connected to the input port, a second terminal of the first transistor is connected to a first terminal of the second transistor, a second terminal of the second transistor is connected to a common ground, one terminal of the inductor is connected to the second terminal of the first transistor, and the other terminal of the inductor is connected to the output port;
the first transistor is configured to charge, based on a second control signal that corresponds to the first power stage circuit among the at least one second control signals, the output port from the input port by using the inductor; and
the second transistor is configured to charge, based on the second control signal, the output port by using the inductor;
wherein a first transistor in a second power stage circuit in the at least one first power stage circuit is shared by the second power stage circuit and the charging circuit; and
the first transistor in the second power stage circuit is configured to charge, based on the first control signal and a second control signal, the output port from the input port by using the inductor.
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