Power conversion system

A power conversion system, comprising:

• X power conversion circuits, wherein X is an integer larger than or equal to one, and each of the X power conversion circuits comprises:
• an input port configured to receive an input voltage;
• an output port configured to output an output voltage;
• N cascaded switching power conversion units, wherein each of the N switching power conversion units comprises a first switch and a second switch, the first switch is serially coupled to one terminal of the second switch, the other terminal of the second switch is grounded, the first switch of the first switching power conversion unit is connected to the input port, the first switch of any other of the N switching power conversion units is serially coupled to the first switch of the preceding switching power conversion unit, and N is an integer larger than or equal to 2;
• and
• N−1 storage device serially coupled between the input and output ports, wherein two ends of the storage device have a first node and a second node respectively, there are n first switches between the (n)th storage device and the input port, and n is an integer larger than or equal to 1 and smaller than or equal to N−1,
• wherein the X input ports of the X power conversion circuits are coupled in parallel, and the X output ports of the X power conversion circuits are coupled in parallel;
• and
• X clamping circuit assemblies, wherein each of the X clamping circuit assemblies comprises N clamping circuits for absorbing a peak voltage generated at two ends of the second switch of the corresponding power conversion circuit, each of the N clamping circuits comprises at least one absorbing capacitor and at least one absorbing diode and has a first terminal, a second terminal and a third terminal, the first and second terminals are electrically connected to the two ends of the corresponding second switch respectively, the at least one absorbing capacitor and the at least one absorbing diode are serially coupled between the first and second terminals for absorbing the peak voltage generated at the two ends of the corresponding second switch, and the third terminal is electrically connected to the corresponding first node or the input port.

A power conversion system, comprising:

• a power conversion circuit, comprising:
• an input port configured to receive an input voltage;
• an output port configured to output an output voltage;
• and
• N cascaded switching power conversion units, wherein each of the N switching power conversion units comprises a first switch, a second switch and a third switch, one terminal of the first switch of the N switching power conversion units are electrically connected to the input port, wherein in each of the N switching power conversion units, the other terminal of the first switch is electrically connected to one terminal of the second switch and one terminal of the third switch through a storage device, the other terminal of the second switch is electrically connected to the other terminal of the first switch of another switching power conversion unit, the other terminal of the third switch is grounded, N is an integer larger than or equal to 2, and two ends of the storage device have a first node and a second node respectively;
• and
• N clamping circuits, wherein each of the N clamping circuits comprises at least one absorbing capacitor and at least one absorbing diode and has a first terminal, a second terminal and a third terminal, the first and second terminals are electrically connected to two ends of the corresponding third switch respectively, the at least one absorbing capacitor and the at least one absorbing diode are serially coupled between the first and second terminals for absorbing a peak voltage generated at the two ends of the corresponding third switch, and the third terminal is electrically connected to the corresponding first node or the input port.

A power conversion system, comprising:

• X power conversion circuits, wherein X is an integer larger than or equal to one, and each of the X power conversion circuits comprises:
• an input port configured to receive an input voltage;
• an output port configured to output an output voltage;
• and
• N cascaded switching power conversion units, wherein each of the N switching power conversion units comprises a first switch, a second switch and a third switch, one terminal of the first switch of the N switching power conversion units are electrically connected to the input port, wherein in each of the switching power conversion units, the other terminal of the first switch is electrically connected to one terminal of the second switch and one terminal of the third switch through a storage device, the other terminal of the second switch is electrically connected to the other terminal of the first switch of another switching power conversion unit, the other terminal of the third switch is grounded, N is an integer larger than or equal to 2, and two ends of the storage device comprises a first node and a second node respectively,
• wherein the X input ports of the X power conversion circuits are coupled in parallel, the X output ports of the X power conversion circuits are coupled in parallel;
• and
• X clamping circuit assemblies, wherein each of the X clamping circuit assemblies comprises N clamping circuits for absorbing a peak voltage generated at two ends of the third switch of the corresponding power conversion circuit, each of the N clamping circuits comprises at least one absorbing capacitor and at least one absorbing diode and has a first terminal, a second terminal and a third terminal, the first and second terminals are electrically connected to the two ends of the corresponding third switch respectively, the at least one absorbing capacitor and the at least one absorbing diode are serially coupled between the first and second terminals for absorbing a peak voltage generated at the two ends of the corresponding third switch, and the third terminal is electrically connected to the corresponding first node or the input port.