Power supply system

A power supply system, comprising:

• a first external path selection circuit, which is configured to operably control a first power at a first node to be electrically connected to a first system port or a second system port;
• a second external path selection circuit, which is configured to operably control a second power at a second node to be electrically connected to the first system port or the second system port;
• a plurality of power conversion modules including a first power conversion module and a second power conversion module, wherein each of the first power conversion module and the second power conversion module includes a conversion circuit, a first input/output end and a second input/output end, wherein the conversion circuit is configured to operate an inductor, so as to execute bilateral power conversion between the first input/output end and the second input/output end, wherein the first input/output end of the first power conversion module is coupled to the first node, whereas, the first input/output end of the second power conversion module is coupled to the second node;
• and
• an internal path selection circuit coupled to the conversion circuits of the power conversion modules, wherein the internal path selection circuit is configured to operably control a third power at a third node to be electrically connected to the conversion circuit of the first power conversion module or the conversion circuit of the second power conversion module, and is configured to operably control a fourth power at a fourth node to be electrically connected to the conversion circuit of the first power conversion module or the conversion circuit of the second power conversion module;
• wherein the third power is coupled to a system circuit, whereas, the fourth power is coupled to a battery;
• wherein the first external path selection circuit, the second external path selection circuit, the power conversion modules and the internal path selection circuit selectively execute one of the following operations:
• (1) receiving at least one external power from at least one of the first system port or the second system port, so as to generate the third power at the third node for providing power to the system circuit and/or generate the fourth power at the fourth node for charging the battery;
• or
• (2) converting the power from the battery, so as to generate at least one output power at at least one of the first system port and the second system port.